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Vendor dependencies

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Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
Knut Ahlers 2017-06-14 21:25:16 +02:00
parent 734b913954
commit a483fab651
Signed by: luzifer
GPG key ID: DC2729FDD34BE99E
545 changed files with 193113 additions and 0 deletions
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247
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{
"ImportPath": "github.com/Luzifer/vault-otp-ui",
"GoVersion": "go1.8",
"GodepVersion": "v79",
"Deps": [
{
"ImportPath": "github.com/Luzifer/rconfig",
"Comment": "v1.1.0",
"Rev": "c27bd3a64b5b19556914d9fec69922cf3852d585"
},
{
"ImportPath": "github.com/Sirupsen/logrus",
"Comment": "v0.10.0-38-g3ec0642",
"Rev": "3ec0642a7fb6488f65b06f9040adc67e3990296a"
},
{
"ImportPath": "github.com/alecthomas/template",
"Rev": "a0175ee3bccc567396460bf5acd36800cb10c49c"
},
{
"ImportPath": "github.com/alecthomas/template/parse",
"Rev": "a0175ee3bccc567396460bf5acd36800cb10c49c"
},
{
"ImportPath": "github.com/boombuler/barcode",
"Rev": "fe0f26ff6d26693948ee8189aa064ee8c54141fa"
},
{
"ImportPath": "github.com/boombuler/barcode/qr",
"Rev": "fe0f26ff6d26693948ee8189aa064ee8c54141fa"
},
{
"ImportPath": "github.com/boombuler/barcode/utils",
"Rev": "fe0f26ff6d26693948ee8189aa064ee8c54141fa"
},
{
"ImportPath": "github.com/fatih/structs",
"Rev": "3fe2facc32a7fbde4b29c0f85604dc1dd22836d2"
},
{
"ImportPath": "github.com/gorilla/context",
"Rev": "1c83b3eabd45b6d76072b66b746c20815fb2872d"
},
{
"ImportPath": "github.com/gorilla/securecookie",
"Rev": "1b0c7f6e9ab3d7f500fd7d50c7ad835ff428139b"
},
{
"ImportPath": "github.com/gorilla/sessions",
"Rev": "aa5e036e6c44aec69a32eb41097001978b29ad31"
},
{
"ImportPath": "github.com/hashicorp/errwrap",
"Rev": "7554cd9344cec97297fa6649b055a8c98c2a1e55"
},
{
"ImportPath": "github.com/hashicorp/go-cleanhttp",
"Rev": "ad28ea4487f05916463e2423a55166280e8254b5"
},
{
"ImportPath": "github.com/hashicorp/go-multierror",
"Rev": "d30f09973e19c1dfcd120b2d9c4f168e68d6b5d5"
},
{
"ImportPath": "github.com/hashicorp/go-rootcerts",
"Rev": "6bb64b370b90e7ef1fa532be9e591a81c3493e00"
},
{
"ImportPath": "github.com/hashicorp/hcl",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/hcl/ast",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/hcl/parser",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/hcl/scanner",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/hcl/strconv",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/hcl/token",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/hcl/json/parser",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
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{
"ImportPath": "github.com/hashicorp/hcl/json/scanner",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
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{
"ImportPath": "github.com/hashicorp/hcl/json/token",
"Rev": "ef8133da8cda503718a74741312bf50821e6de79"
},
{
"ImportPath": "github.com/hashicorp/vault/api",
"Comment": "v0.7.0-190-g4490e93",
"Rev": "4490e93395fb70c3a25ade1fe88f363561a7d584"
},
{
"ImportPath": "github.com/hashicorp/vault/helper/compressutil",
"Comment": "v0.7.0-190-g4490e93",
"Rev": "4490e93395fb70c3a25ade1fe88f363561a7d584"
},
{
"ImportPath": "github.com/hashicorp/vault/helper/jsonutil",
"Comment": "v0.7.0-190-g4490e93",
"Rev": "4490e93395fb70c3a25ade1fe88f363561a7d584"
},
{
"ImportPath": "github.com/mitchellh/go-homedir",
"Rev": "981ab348d865cf048eb7d17e78ac7192632d8415"
},
{
"ImportPath": "github.com/mitchellh/mapstructure",
"Rev": "ca63d7c062ee3c9f34db231e352b60012b4fd0c1"
},
{
"ImportPath": "github.com/pquerna/otp",
"Rev": "54653902c20e47f3417541d35435cb6d6162e28a"
},
{
"ImportPath": "github.com/pquerna/otp/hotp",
"Rev": "54653902c20e47f3417541d35435cb6d6162e28a"
},
{
"ImportPath": "github.com/pquerna/otp/totp",
"Rev": "54653902c20e47f3417541d35435cb6d6162e28a"
},
{
"ImportPath": "github.com/prometheus/common/log",
"Rev": "6d76b79f239843a04e8ad8dfd8fcadfa3920236f"
},
{
"ImportPath": "github.com/sethgrid/pester",
"Rev": "4f4c0a67b6496764028e1ab9fd8dfb630282ed2f"
},
{
"ImportPath": "github.com/spf13/pflag",
"Rev": "c7e63cf4530bcd3ba943729cee0efeff2ebea63f"
},
{
"ImportPath": "github.com/tdewolff/buffer",
"Comment": "v1.0.0-6-g0edfcb7",
"Rev": "0edfcb7b750146ff879e95831de2ef53605a5cb5"
},
{
"ImportPath": "github.com/tdewolff/minify",
"Comment": "v2.0.0-85-g28aac1f",
"Rev": "28aac1f92d928dfb63dd0258a3b2248a020e86da"
},
{
"ImportPath": "github.com/tdewolff/minify/html",
"Comment": "v2.0.0-85-g28aac1f",
"Rev": "28aac1f92d928dfb63dd0258a3b2248a020e86da"
},
{
"ImportPath": "github.com/tdewolff/minify/js",
"Comment": "v2.0.0-85-g28aac1f",
"Rev": "28aac1f92d928dfb63dd0258a3b2248a020e86da"
},
{
"ImportPath": "github.com/tdewolff/parse",
"Comment": "v2.0.0-2-g34d5c11",
"Rev": "34d5c1160d4503da4b456e5094609f2331d6dde3"
},
{
"ImportPath": "github.com/tdewolff/parse/html",
"Comment": "v2.0.0-2-g34d5c11",
"Rev": "34d5c1160d4503da4b456e5094609f2331d6dde3"
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{
"ImportPath": "github.com/tdewolff/parse/js",
"Comment": "v2.0.0-2-g34d5c11",
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},
{
"ImportPath": "github.com/tdewolff/strconv",
"Rev": "3e8091f4417ebaaa3910da63a45ea394ebbfb0e3"
},
{
"ImportPath": "golang.org/x/net/http2",
"Rev": "dfe83d419c9403b40b19d08cdba2afec27b002f7"
},
{
"ImportPath": "golang.org/x/net/http2/hpack",
"Rev": "dfe83d419c9403b40b19d08cdba2afec27b002f7"
},
{
"ImportPath": "golang.org/x/net/idna",
"Rev": "dfe83d419c9403b40b19d08cdba2afec27b002f7"
},
{
"ImportPath": "golang.org/x/net/lex/httplex",
"Rev": "dfe83d419c9403b40b19d08cdba2afec27b002f7"
},
{
"ImportPath": "golang.org/x/sys/unix",
"Rev": "8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9"
},
{
"ImportPath": "golang.org/x/sys/windows",
"Rev": "8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9"
},
{
"ImportPath": "golang.org/x/sys/windows/registry",
"Rev": "8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9"
},
{
"ImportPath": "golang.org/x/sys/windows/svc/eventlog",
"Rev": "8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9"
},
{
"ImportPath": "golang.org/x/text/secure/bidirule",
"Rev": "3491b61b9edc56653ad4333e605e2908e46a036b"
},
{
"ImportPath": "golang.org/x/text/transform",
"Rev": "3491b61b9edc56653ad4333e605e2908e46a036b"
},
{
"ImportPath": "golang.org/x/text/unicode/bidi",
"Rev": "3491b61b9edc56653ad4333e605e2908e46a036b"
},
{
"ImportPath": "golang.org/x/text/unicode/norm",
"Rev": "3491b61b9edc56653ad4333e605e2908e46a036b"
},
{
"ImportPath": "gopkg.in/validator.v2",
"Rev": "07ffaad256c8e957050ad83d6472eb97d785013d"
},
{
"ImportPath": "gopkg.in/yaml.v2",
"Rev": "31c299268d302dd0aa9a0dcf765a3d58971ac83f"
}
]
}

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This directory tree is generated automatically by godep.
Please do not edit.
See https://github.com/tools/godep for more information.

8
vendor/github.com/Luzifer/rconfig/.travis.yml generated vendored Normal file
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language: go
go:
- 1.4
- 1.5
- tip
script: go test -v -race -cover ./...

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# 1.1.0 / 2016-06-28
* Support time.Duration config parameters
* Added goreportcard badge
* Added testcase for using bool with ENV and default

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Copyright 2015 Knut Ahlers <knut@ahlers.me>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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[![Build Status](https://travis-ci.org/Luzifer/rconfig.svg?branch=master)](https://travis-ci.org/Luzifer/rconfig)
[![License: Apache v2.0](https://badge.luzifer.io/v1/badge?color=5d79b5&title=license&text=Apache+v2.0)](http://www.apache.org/licenses/LICENSE-2.0)
[![Documentation](https://badge.luzifer.io/v1/badge?title=godoc&text=reference)](https://godoc.org/github.com/Luzifer/rconfig)
[![Go Report](http://goreportcard.com/badge/Luzifer/rconfig)](http://goreportcard.com/report/Luzifer/rconfig)
## Description
> Package rconfig implements a CLI configuration reader with struct-embedded defaults, environment variables and posix compatible flag parsing using the [pflag](https://github.com/spf13/pflag) library.
## Installation
Install by running:
```
go get -u github.com/Luzifer/rconfig
```
OR fetch a specific version:
```
go get -u gopkg.in/luzifer/rconfig.v1
```
Run tests by running:
```
go test -v -race -cover github.com/Luzifer/rconfig
```
## Usage
As a first step define a struct holding your configuration:
```go
type config struct {
Username string `default:"unknown" flag:"user" description:"Your name"`
Details struct {
Age int `default:"25" flag:"age" env:"age" description:"Your age"`
}
}
```
Next create an instance of that struct and let `rconfig` fill that config:
```go
var cfg config
func init() {
cfg = config{}
rconfig.Parse(&cfg)
}
```
You're ready to access your configuration:
```go
func main() {
fmt.Printf("Hello %s, happy birthday for your %dth birthday.",
cfg.Username,
cfg.Details.Age)
}
```
### Provide variable defaults by using a file
Given you have a file `~/.myapp.yml` containing some secrets or usernames (for the example below username is assumed to be "luzifer") as a default configuration for your application you can use this source code to load the defaults from that file using the `vardefault` tag in your configuration struct.
The order of the directives (lower number = higher precedence):
1. Flags provided in command line
1. Environment variables
1. Variable defaults (`vardefault` tag in the struct)
1. `default` tag in the struct
```go
type config struct {
Username string `vardefault:"username" flag:"username" description:"Your username"`
}
var cfg = config{}
func init() {
rconfig.SetVariableDefaults(rconfig.VarDefaultsFromYAMLFile("~/.myapp.yml"))
rconfig.Parse(&cfg)
}
func main() {
fmt.Printf("Username = %s", cfg.Username)
// Output: Username = luzifer
}
```
## More info
You can see the full reference documentation of the rconfig package [at godoc.org](https://godoc.org/github.com/Luzifer/rconfig), or through go's standard documentation system by running `godoc -http=:6060` and browsing to [http://localhost:6060/pkg/github.com/Luzifer/rconfig](http://localhost:6060/pkg/github.com/Luzifer/rconfig) after installation.

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// Package rconfig implements a CLI configuration reader with struct-embedded
// defaults, environment variables and posix compatible flag parsing using
// the pflag library.
package rconfig
import (
"errors"
"fmt"
"os"
"reflect"
"strconv"
"strings"
"time"
"github.com/spf13/pflag"
)
var (
fs *pflag.FlagSet
variableDefaults map[string]string
)
func init() {
variableDefaults = make(map[string]string)
}
// Parse takes the pointer to a struct filled with variables which should be read
// from ENV, default or flag. The precedence in this is flag > ENV > default. So
// if a flag is specified on the CLI it will overwrite the ENV and otherwise ENV
// overwrites the default specified.
//
// For your configuration struct you can use the following struct-tags to control
// the behavior of rconfig:
//
// default: Set a default value
// vardefault: Read the default value from the variable defaults
// env: Read the value from this environment variable
// flag: Flag to read in format "long,short" (for example "listen,l")
// description: A help text for Usage output to guide your users
//
// The format you need to specify those values you can see in the example to this
// function.
//
func Parse(config interface{}) error {
return parse(config, nil)
}
// Args returns the non-flag command-line arguments.
func Args() []string {
return fs.Args()
}
// Usage prints a basic usage with the corresponding defaults for the flags to
// os.Stdout. The defaults are derived from the `default` struct-tag and the ENV.
func Usage() {
if fs != nil && fs.Parsed() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
fs.PrintDefaults()
}
}
// SetVariableDefaults presets the parser with a map of default values to be used
// when specifying the vardefault tag
func SetVariableDefaults(defaults map[string]string) {
variableDefaults = defaults
}
func parse(in interface{}, args []string) error {
if args == nil {
args = os.Args
}
fs = pflag.NewFlagSet(os.Args[0], pflag.ExitOnError)
if err := execTags(in, fs); err != nil {
return err
}
return fs.Parse(args)
}
func execTags(in interface{}, fs *pflag.FlagSet) error {
if reflect.TypeOf(in).Kind() != reflect.Ptr {
return errors.New("Calling parser with non-pointer")
}
if reflect.ValueOf(in).Elem().Kind() != reflect.Struct {
return errors.New("Calling parser with pointer to non-struct")
}
st := reflect.ValueOf(in).Elem()
for i := 0; i < st.NumField(); i++ {
valField := st.Field(i)
typeField := st.Type().Field(i)
if typeField.Tag.Get("default") == "" && typeField.Tag.Get("env") == "" && typeField.Tag.Get("flag") == "" && typeField.Type.Kind() != reflect.Struct {
// None of our supported tags is present and it's not a sub-struct
continue
}
value := varDefault(typeField.Tag.Get("vardefault"), typeField.Tag.Get("default"))
value = envDefault(typeField.Tag.Get("env"), value)
parts := strings.Split(typeField.Tag.Get("flag"), ",")
switch typeField.Type {
case reflect.TypeOf(time.Duration(0)):
v, err := time.ParseDuration(value)
if err != nil {
if value == "" {
v = time.Duration(0)
} else {
return err
}
}
if typeField.Tag.Get("flag") != "" {
if len(parts) == 1 {
fs.DurationVar(valField.Addr().Interface().(*time.Duration), parts[0], v, typeField.Tag.Get("description"))
} else {
fs.DurationVarP(valField.Addr().Interface().(*time.Duration), parts[0], parts[1], v, typeField.Tag.Get("description"))
}
} else {
valField.Set(reflect.ValueOf(v))
}
continue
}
switch typeField.Type.Kind() {
case reflect.String:
if typeField.Tag.Get("flag") != "" {
if len(parts) == 1 {
fs.StringVar(valField.Addr().Interface().(*string), parts[0], value, typeField.Tag.Get("description"))
} else {
fs.StringVarP(valField.Addr().Interface().(*string), parts[0], parts[1], value, typeField.Tag.Get("description"))
}
} else {
valField.SetString(value)
}
case reflect.Bool:
v := value == "true"
if typeField.Tag.Get("flag") != "" {
if len(parts) == 1 {
fs.BoolVar(valField.Addr().Interface().(*bool), parts[0], v, typeField.Tag.Get("description"))
} else {
fs.BoolVarP(valField.Addr().Interface().(*bool), parts[0], parts[1], v, typeField.Tag.Get("description"))
}
} else {
valField.SetBool(v)
}
case reflect.Int, reflect.Int8, reflect.Int32, reflect.Int64:
vt, err := strconv.ParseInt(value, 10, 64)
if err != nil {
if value == "" {
vt = 0
} else {
return err
}
}
if typeField.Tag.Get("flag") != "" {
registerFlagInt(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
} else {
valField.SetInt(vt)
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
vt, err := strconv.ParseUint(value, 10, 64)
if err != nil {
if value == "" {
vt = 0
} else {
return err
}
}
if typeField.Tag.Get("flag") != "" {
registerFlagUint(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
} else {
valField.SetUint(vt)
}
case reflect.Float32, reflect.Float64:
vt, err := strconv.ParseFloat(value, 64)
if err != nil {
if value == "" {
vt = 0.0
} else {
return err
}
}
if typeField.Tag.Get("flag") != "" {
registerFlagFloat(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
} else {
valField.SetFloat(vt)
}
case reflect.Struct:
if err := execTags(valField.Addr().Interface(), fs); err != nil {
return err
}
case reflect.Slice:
switch typeField.Type.Elem().Kind() {
case reflect.Int:
def := []int{}
for _, v := range strings.Split(value, ",") {
it, err := strconv.ParseInt(strings.TrimSpace(v), 10, 64)
if err != nil {
return err
}
def = append(def, int(it))
}
if len(parts) == 1 {
fs.IntSliceVar(valField.Addr().Interface().(*[]int), parts[0], def, typeField.Tag.Get("description"))
} else {
fs.IntSliceVarP(valField.Addr().Interface().(*[]int), parts[0], parts[1], def, typeField.Tag.Get("description"))
}
case reflect.String:
del := typeField.Tag.Get("delimiter")
if len(del) == 0 {
del = ","
}
def := strings.Split(value, del)
if len(parts) == 1 {
fs.StringSliceVar(valField.Addr().Interface().(*[]string), parts[0], def, typeField.Tag.Get("description"))
} else {
fs.StringSliceVarP(valField.Addr().Interface().(*[]string), parts[0], parts[1], def, typeField.Tag.Get("description"))
}
}
}
}
return nil
}
func registerFlagFloat(t reflect.Kind, fs *pflag.FlagSet, field interface{}, parts []string, vt float64, desc string) {
switch t {
case reflect.Float32:
if len(parts) == 1 {
fs.Float32Var(field.(*float32), parts[0], float32(vt), desc)
} else {
fs.Float32VarP(field.(*float32), parts[0], parts[1], float32(vt), desc)
}
case reflect.Float64:
if len(parts) == 1 {
fs.Float64Var(field.(*float64), parts[0], float64(vt), desc)
} else {
fs.Float64VarP(field.(*float64), parts[0], parts[1], float64(vt), desc)
}
}
}
func registerFlagInt(t reflect.Kind, fs *pflag.FlagSet, field interface{}, parts []string, vt int64, desc string) {
switch t {
case reflect.Int:
if len(parts) == 1 {
fs.IntVar(field.(*int), parts[0], int(vt), desc)
} else {
fs.IntVarP(field.(*int), parts[0], parts[1], int(vt), desc)
}
case reflect.Int8:
if len(parts) == 1 {
fs.Int8Var(field.(*int8), parts[0], int8(vt), desc)
} else {
fs.Int8VarP(field.(*int8), parts[0], parts[1], int8(vt), desc)
}
case reflect.Int32:
if len(parts) == 1 {
fs.Int32Var(field.(*int32), parts[0], int32(vt), desc)
} else {
fs.Int32VarP(field.(*int32), parts[0], parts[1], int32(vt), desc)
}
case reflect.Int64:
if len(parts) == 1 {
fs.Int64Var(field.(*int64), parts[0], int64(vt), desc)
} else {
fs.Int64VarP(field.(*int64), parts[0], parts[1], int64(vt), desc)
}
}
}
func registerFlagUint(t reflect.Kind, fs *pflag.FlagSet, field interface{}, parts []string, vt uint64, desc string) {
switch t {
case reflect.Uint:
if len(parts) == 1 {
fs.UintVar(field.(*uint), parts[0], uint(vt), desc)
} else {
fs.UintVarP(field.(*uint), parts[0], parts[1], uint(vt), desc)
}
case reflect.Uint8:
if len(parts) == 1 {
fs.Uint8Var(field.(*uint8), parts[0], uint8(vt), desc)
} else {
fs.Uint8VarP(field.(*uint8), parts[0], parts[1], uint8(vt), desc)
}
case reflect.Uint16:
if len(parts) == 1 {
fs.Uint16Var(field.(*uint16), parts[0], uint16(vt), desc)
} else {
fs.Uint16VarP(field.(*uint16), parts[0], parts[1], uint16(vt), desc)
}
case reflect.Uint32:
if len(parts) == 1 {
fs.Uint32Var(field.(*uint32), parts[0], uint32(vt), desc)
} else {
fs.Uint32VarP(field.(*uint32), parts[0], parts[1], uint32(vt), desc)
}
case reflect.Uint64:
if len(parts) == 1 {
fs.Uint64Var(field.(*uint64), parts[0], uint64(vt), desc)
} else {
fs.Uint64VarP(field.(*uint64), parts[0], parts[1], uint64(vt), desc)
}
}
}
func envDefault(env, def string) string {
value := def
if env != "" {
if e := os.Getenv(env); e != "" {
value = e
}
}
return value
}
func varDefault(name, def string) string {
value := def
if name != "" {
if v, ok := variableDefaults[name]; ok {
value = v
}
}
return value
}

27
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package rconfig
import (
"io/ioutil"
"gopkg.in/yaml.v2"
)
// VarDefaultsFromYAMLFile reads contents of a file and calls VarDefaultsFromYAML
func VarDefaultsFromYAMLFile(filename string) map[string]string {
data, err := ioutil.ReadFile(filename)
if err != nil {
return make(map[string]string)
}
return VarDefaultsFromYAML(data)
}
// VarDefaultsFromYAML creates a vardefaults map from YAML raw data
func VarDefaultsFromYAML(in []byte) map[string]string {
out := make(map[string]string)
err := yaml.Unmarshal(in, &out)
if err != nil {
return make(map[string]string)
}
return out
}

1
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@ -0,0 +1 @@
logrus

10
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@ -0,0 +1,10 @@
language: go
go:
- 1.3
- 1.4
- 1.5
- 1.6
- tip
install:
- go get -t ./...
script: GOMAXPROCS=4 GORACE="halt_on_error=1" go test -race -v ./...

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# 0.10.0
* feature: Add a test hook (#180)
* feature: `ParseLevel` is now case-insensitive (#326)
* feature: `FieldLogger` interface that generalizes `Logger` and `Entry` (#308)
* performance: avoid re-allocations on `WithFields` (#335)
# 0.9.0
* logrus/text_formatter: don't emit empty msg
* logrus/hooks/airbrake: move out of main repository
* logrus/hooks/sentry: move out of main repository
* logrus/hooks/papertrail: move out of main repository
* logrus/hooks/bugsnag: move out of main repository
* logrus/core: run tests with `-race`
* logrus/core: detect TTY based on `stderr`
* logrus/core: support `WithError` on logger
* logrus/core: Solaris support
# 0.8.7
* logrus/core: fix possible race (#216)
* logrus/doc: small typo fixes and doc improvements
# 0.8.6
* hooks/raven: allow passing an initialized client
# 0.8.5
* logrus/core: revert #208
# 0.8.4
* formatter/text: fix data race (#218)
# 0.8.3
* logrus/core: fix entry log level (#208)
* logrus/core: improve performance of text formatter by 40%
* logrus/core: expose `LevelHooks` type
* logrus/core: add support for DragonflyBSD and NetBSD
* formatter/text: print structs more verbosely
# 0.8.2
* logrus: fix more Fatal family functions
# 0.8.1
* logrus: fix not exiting on `Fatalf` and `Fatalln`
# 0.8.0
* logrus: defaults to stderr instead of stdout
* hooks/sentry: add special field for `*http.Request`
* formatter/text: ignore Windows for colors
# 0.7.3
* formatter/\*: allow configuration of timestamp layout
# 0.7.2
* formatter/text: Add configuration option for time format (#158)

21
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The MIT License (MIT)
Copyright (c) 2014 Simon Eskildsen
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# Logrus <img src="http://i.imgur.com/hTeVwmJ.png" width="40" height="40" alt=":walrus:" class="emoji" title=":walrus:"/>&nbsp;[![Build Status](https://travis-ci.org/Sirupsen/logrus.svg?branch=master)](https://travis-ci.org/Sirupsen/logrus)&nbsp;[![GoDoc](https://godoc.org/github.com/Sirupsen/logrus?status.svg)](https://godoc.org/github.com/Sirupsen/logrus)
Logrus is a structured logger for Go (golang), completely API compatible with
the standard library logger. [Godoc][godoc]. **Please note the Logrus API is not
yet stable (pre 1.0). Logrus itself is completely stable and has been used in
many large deployments. The core API is unlikely to change much but please
version control your Logrus to make sure you aren't fetching latest `master` on
every build.**
Nicely color-coded in development (when a TTY is attached, otherwise just
plain text):
![Colored](http://i.imgur.com/PY7qMwd.png)
With `log.SetFormatter(&log.JSONFormatter{})`, for easy parsing by logstash
or Splunk:
```json
{"animal":"walrus","level":"info","msg":"A group of walrus emerges from the
ocean","size":10,"time":"2014-03-10 19:57:38.562264131 -0400 EDT"}
{"level":"warning","msg":"The group's number increased tremendously!",
"number":122,"omg":true,"time":"2014-03-10 19:57:38.562471297 -0400 EDT"}
{"animal":"walrus","level":"info","msg":"A giant walrus appears!",
"size":10,"time":"2014-03-10 19:57:38.562500591 -0400 EDT"}
{"animal":"walrus","level":"info","msg":"Tremendously sized cow enters the ocean.",
"size":9,"time":"2014-03-10 19:57:38.562527896 -0400 EDT"}
{"level":"fatal","msg":"The ice breaks!","number":100,"omg":true,
"time":"2014-03-10 19:57:38.562543128 -0400 EDT"}
```
With the default `log.SetFormatter(&log.TextFormatter{})` when a TTY is not
attached, the output is compatible with the
[logfmt](http://godoc.org/github.com/kr/logfmt) format:
```text
time="2015-03-26T01:27:38-04:00" level=debug msg="Started observing beach" animal=walrus number=8
time="2015-03-26T01:27:38-04:00" level=info msg="A group of walrus emerges from the ocean" animal=walrus size=10
time="2015-03-26T01:27:38-04:00" level=warning msg="The group's number increased tremendously!" number=122 omg=true
time="2015-03-26T01:27:38-04:00" level=debug msg="Temperature changes" temperature=-4
time="2015-03-26T01:27:38-04:00" level=panic msg="It's over 9000!" animal=orca size=9009
time="2015-03-26T01:27:38-04:00" level=fatal msg="The ice breaks!" err=&{0x2082280c0 map[animal:orca size:9009] 2015-03-26 01:27:38.441574009 -0400 EDT panic It's over 9000!} number=100 omg=true
exit status 1
```
#### Example
The simplest way to use Logrus is simply the package-level exported logger:
```go
package main
import (
log "github.com/Sirupsen/logrus"
)
func main() {
log.WithFields(log.Fields{
"animal": "walrus",
}).Info("A walrus appears")
}
```
Note that it's completely api-compatible with the stdlib logger, so you can
replace your `log` imports everywhere with `log "github.com/Sirupsen/logrus"`
and you'll now have the flexibility of Logrus. You can customize it all you
want:
```go
package main
import (
"os"
log "github.com/Sirupsen/logrus"
)
func init() {
// Log as JSON instead of the default ASCII formatter.
log.SetFormatter(&log.JSONFormatter{})
// Output to stderr instead of stdout, could also be a file.
log.SetOutput(os.Stderr)
// Only log the warning severity or above.
log.SetLevel(log.WarnLevel)
}
func main() {
log.WithFields(log.Fields{
"animal": "walrus",
"size": 10,
}).Info("A group of walrus emerges from the ocean")
log.WithFields(log.Fields{
"omg": true,
"number": 122,
}).Warn("The group's number increased tremendously!")
log.WithFields(log.Fields{
"omg": true,
"number": 100,
}).Fatal("The ice breaks!")
// A common pattern is to re-use fields between logging statements by re-using
// the logrus.Entry returned from WithFields()
contextLogger := log.WithFields(log.Fields{
"common": "this is a common field",
"other": "I also should be logged always",
})
contextLogger.Info("I'll be logged with common and other field")
contextLogger.Info("Me too")
}
```
For more advanced usage such as logging to multiple locations from the same
application, you can also create an instance of the `logrus` Logger:
```go
package main
import (
"github.com/Sirupsen/logrus"
)
// Create a new instance of the logger. You can have any number of instances.
var log = logrus.New()
func main() {
// The API for setting attributes is a little different than the package level
// exported logger. See Godoc.
log.Out = os.Stderr
log.WithFields(logrus.Fields{
"animal": "walrus",
"size": 10,
}).Info("A group of walrus emerges from the ocean")
}
```
#### Fields
Logrus encourages careful, structured logging though logging fields instead of
long, unparseable error messages. For example, instead of: `log.Fatalf("Failed
to send event %s to topic %s with key %d")`, you should log the much more
discoverable:
```go
log.WithFields(log.Fields{
"event": event,
"topic": topic,
"key": key,
}).Fatal("Failed to send event")
```
We've found this API forces you to think about logging in a way that produces
much more useful logging messages. We've been in countless situations where just
a single added field to a log statement that was already there would've saved us
hours. The `WithFields` call is optional.
In general, with Logrus using any of the `printf`-family functions should be
seen as a hint you should add a field, however, you can still use the
`printf`-family functions with Logrus.
#### Hooks
You can add hooks for logging levels. For example to send errors to an exception
tracking service on `Error`, `Fatal` and `Panic`, info to StatsD or log to
multiple places simultaneously, e.g. syslog.
Logrus comes with [built-in hooks](hooks/). Add those, or your custom hook, in
`init`:
```go
import (
log "github.com/Sirupsen/logrus"
"gopkg.in/gemnasium/logrus-airbrake-hook.v2" // the package is named "aibrake"
logrus_syslog "github.com/Sirupsen/logrus/hooks/syslog"
"log/syslog"
)
func init() {
// Use the Airbrake hook to report errors that have Error severity or above to
// an exception tracker. You can create custom hooks, see the Hooks section.
log.AddHook(airbrake.NewHook(123, "xyz", "production"))
hook, err := logrus_syslog.NewSyslogHook("udp", "localhost:514", syslog.LOG_INFO, "")
if err != nil {
log.Error("Unable to connect to local syslog daemon")
} else {
log.AddHook(hook)
}
}
```
Note: Syslog hook also support connecting to local syslog (Ex. "/dev/log" or "/var/run/syslog" or "/var/run/log"). For the detail, please check the [syslog hook README](hooks/syslog/README.md).
| Hook | Description |
| ----- | ----------- |
| [Airbrake](https://github.com/gemnasium/logrus-airbrake-hook) | Send errors to the Airbrake API V3. Uses the official [`gobrake`](https://github.com/airbrake/gobrake) behind the scenes. |
| [Airbrake "legacy"](https://github.com/gemnasium/logrus-airbrake-legacy-hook) | Send errors to an exception tracking service compatible with the Airbrake API V2. Uses [`airbrake-go`](https://github.com/tobi/airbrake-go) behind the scenes. |
| [Papertrail](https://github.com/polds/logrus-papertrail-hook) | Send errors to the [Papertrail](https://papertrailapp.com) hosted logging service via UDP. |
| [Syslog](https://github.com/Sirupsen/logrus/blob/master/hooks/syslog/syslog.go) | Send errors to remote syslog server. Uses standard library `log/syslog` behind the scenes. |
| [Bugsnag](https://github.com/Shopify/logrus-bugsnag/blob/master/bugsnag.go) | Send errors to the Bugsnag exception tracking service. |
| [Sentry](https://github.com/evalphobia/logrus_sentry) | Send errors to the Sentry error logging and aggregation service. |
| [Hiprus](https://github.com/nubo/hiprus) | Send errors to a channel in hipchat. |
| [Logrusly](https://github.com/sebest/logrusly) | Send logs to [Loggly](https://www.loggly.com/) |
| [Slackrus](https://github.com/johntdyer/slackrus) | Hook for Slack chat. |
| [Journalhook](https://github.com/wercker/journalhook) | Hook for logging to `systemd-journald` |
| [Graylog](https://github.com/gemnasium/logrus-graylog-hook) | Hook for logging to [Graylog](http://graylog2.org/) |
| [Raygun](https://github.com/squirkle/logrus-raygun-hook) | Hook for logging to [Raygun.io](http://raygun.io/) |
| [LFShook](https://github.com/rifflock/lfshook) | Hook for logging to the local filesystem |
| [Honeybadger](https://github.com/agonzalezro/logrus_honeybadger) | Hook for sending exceptions to Honeybadger |
| [Mail](https://github.com/zbindenren/logrus_mail) | Hook for sending exceptions via mail |
| [Rollrus](https://github.com/heroku/rollrus) | Hook for sending errors to rollbar |
| [Fluentd](https://github.com/evalphobia/logrus_fluent) | Hook for logging to fluentd |
| [Mongodb](https://github.com/weekface/mgorus) | Hook for logging to mongodb |
| [Influxus] (http://github.com/vlad-doru/influxus) | Hook for concurrently logging to [InfluxDB] (http://influxdata.com/) |
| [InfluxDB](https://github.com/Abramovic/logrus_influxdb) | Hook for logging to influxdb |
| [Octokit](https://github.com/dorajistyle/logrus-octokit-hook) | Hook for logging to github via octokit |
| [DeferPanic](https://github.com/deferpanic/dp-logrus) | Hook for logging to DeferPanic |
| [Redis-Hook](https://github.com/rogierlommers/logrus-redis-hook) | Hook for logging to a ELK stack (through Redis) |
| [Amqp-Hook](https://github.com/vladoatanasov/logrus_amqp) | Hook for logging to Amqp broker (Like RabbitMQ) |
| [KafkaLogrus](https://github.com/goibibo/KafkaLogrus) | Hook for logging to kafka |
| [Typetalk](https://github.com/dragon3/logrus-typetalk-hook) | Hook for logging to [Typetalk](https://www.typetalk.in/) |
| [ElasticSearch](https://github.com/sohlich/elogrus) | Hook for logging to ElasticSearch|
| [Sumorus](https://github.com/doublefree/sumorus) | Hook for logging to [SumoLogic](https://www.sumologic.com/)|
| [Logstash](https://github.com/bshuster-repo/logrus-logstash-hook) | Hook for logging to [Logstash](https://www.elastic.co/products/logstash) |
| [Logmatic.io](https://github.com/logmatic/logmatic-go) | Hook for logging to [Logmatic.io](http://logmatic.io/) |
#### Level logging
Logrus has six logging levels: Debug, Info, Warning, Error, Fatal and Panic.
```go
log.Debug("Useful debugging information.")
log.Info("Something noteworthy happened!")
log.Warn("You should probably take a look at this.")
log.Error("Something failed but I'm not quitting.")
// Calls os.Exit(1) after logging
log.Fatal("Bye.")
// Calls panic() after logging
log.Panic("I'm bailing.")
```
You can set the logging level on a `Logger`, then it will only log entries with
that severity or anything above it:
```go
// Will log anything that is info or above (warn, error, fatal, panic). Default.
log.SetLevel(log.InfoLevel)
```
It may be useful to set `log.Level = logrus.DebugLevel` in a debug or verbose
environment if your application has that.
#### Entries
Besides the fields added with `WithField` or `WithFields` some fields are
automatically added to all logging events:
1. `time`. The timestamp when the entry was created.
2. `msg`. The logging message passed to `{Info,Warn,Error,Fatal,Panic}` after
the `AddFields` call. E.g. `Failed to send event.`
3. `level`. The logging level. E.g. `info`.
#### Environments
Logrus has no notion of environment.
If you wish for hooks and formatters to only be used in specific environments,
you should handle that yourself. For example, if your application has a global
variable `Environment`, which is a string representation of the environment you
could do:
```go
import (
log "github.com/Sirupsen/logrus"
)
init() {
// do something here to set environment depending on an environment variable
// or command-line flag
if Environment == "production" {
log.SetFormatter(&log.JSONFormatter{})
} else {
// The TextFormatter is default, you don't actually have to do this.
log.SetFormatter(&log.TextFormatter{})
}
}
```
This configuration is how `logrus` was intended to be used, but JSON in
production is mostly only useful if you do log aggregation with tools like
Splunk or Logstash.
#### Formatters
The built-in logging formatters are:
* `logrus.TextFormatter`. Logs the event in colors if stdout is a tty, otherwise
without colors.
* *Note:* to force colored output when there is no TTY, set the `ForceColors`
field to `true`. To force no colored output even if there is a TTY set the
`DisableColors` field to `true`
* `logrus.JSONFormatter`. Logs fields as JSON.
Third party logging formatters:
* [`logstash`](https://github.com/bshuster-repo/logrus-logstash-hook). Logs fields as [Logstash](http://logstash.net) Events.
* [`prefixed`](https://github.com/x-cray/logrus-prefixed-formatter). Displays log entry source along with alternative layout.
* [`zalgo`](https://github.com/aybabtme/logzalgo). Invoking the P͉̫o̳̼̊w̖͈̰͎e̬͔̭͂r͚̼̹̲ ̫͓͉̳͈ō̠͕͖̚f̝͍̠ ͕̲̞͖͑Z̖̫̤̫ͪa͉̬͈̗l͖͎g̳̥o̰̥̅!̣͔̲̻͊̄ ̙̘̦̹̦.
You can define your formatter by implementing the `Formatter` interface,
requiring a `Format` method. `Format` takes an `*Entry`. `entry.Data` is a
`Fields` type (`map[string]interface{}`) with all your fields as well as the
default ones (see Entries section above):
```go
type MyJSONFormatter struct {
}
log.SetFormatter(new(MyJSONFormatter))
func (f *MyJSONFormatter) Format(entry *Entry) ([]byte, error) {
// Note this doesn't include Time, Level and Message which are available on
// the Entry. Consult `godoc` on information about those fields or read the
// source of the official loggers.
serialized, err := json.Marshal(entry.Data)
if err != nil {
return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
}
return append(serialized, '\n'), nil
}
```
#### Logger as an `io.Writer`
Logrus can be transformed into an `io.Writer`. That writer is the end of an `io.Pipe` and it is your responsibility to close it.
```go
w := logger.Writer()
defer w.Close()
srv := http.Server{
// create a stdlib log.Logger that writes to
// logrus.Logger.
ErrorLog: log.New(w, "", 0),
}
```
Each line written to that writer will be printed the usual way, using formatters
and hooks. The level for those entries is `info`.
#### Rotation
Log rotation is not provided with Logrus. Log rotation should be done by an
external program (like `logrotate(8)`) that can compress and delete old log
entries. It should not be a feature of the application-level logger.
#### Tools
| Tool | Description |
| ---- | ----------- |
|[Logrus Mate](https://github.com/gogap/logrus_mate)|Logrus mate is a tool for Logrus to manage loggers, you can initial logger's level, hook and formatter by config file, the logger will generated with different config at different environment.|
#### Testing
Logrus has a built in facility for asserting the presence of log messages. This is implemented through the `test` hook and provides:
* decorators for existing logger (`test.NewLocal` and `test.NewGlobal`) which basically just add the `test` hook
* a test logger (`test.NewNullLogger`) that just records log messages (and does not output any):
```go
logger, hook := NewNullLogger()
logger.Error("Hello error")
assert.Equal(1, len(hook.Entries))
assert.Equal(logrus.ErrorLevel, hook.LastEntry().Level)
assert.Equal("Hello error", hook.LastEntry().Message)
hook.Reset()
assert.Nil(hook.LastEntry())
```
#### Fatal handlers
Logrus can register one or more functions that will be called when any `fatal`
level message is logged. The registered handlers will be executed before
logrus performs a `os.Exit(1)`. This behavior may be helpful if callers need
to gracefully shutdown. Unlike a `panic("Something went wrong...")` call which can be intercepted with a deferred `recover` a call to `os.Exit(1)` can not be intercepted.
```
...
handler := func() {
// gracefully shutdown something...
}
logrus.RegisterExitHandler(handler)
...
```
#### Thread safty
By default Logger is protected by mutex for concurrent writes, this mutex is invoked when calling hooks and writing logs.
If you are sure such locking is not needed, you can call logger.SetNoLock() to disable the locking.
Situation when locking is not needed includes:
* You have no hooks registered, or hooks calling is already thread-safe.
* Writing to logger.Out is already thread-safe, for example:
1) logger.Out is protected by locks.
2) logger.Out is a os.File handler opened with `O_APPEND` flag, and every write is smaller than 4k. (This allow multi-thread/multi-process writing)
(Refer to http://www.notthewizard.com/2014/06/17/are-files-appends-really-atomic/)

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package logrus
// The following code was sourced and modified from the
// https://bitbucket.org/tebeka/atexit package governed by the following license:
//
// Copyright (c) 2012 Miki Tebeka <miki.tebeka@gmail.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import (
"fmt"
"os"
)
var handlers = []func(){}
func runHandler(handler func()) {
defer func() {
if err := recover(); err != nil {
fmt.Fprintln(os.Stderr, "Error: Logrus exit handler error:", err)
}
}()
handler()
}
func runHandlers() {
for _, handler := range handlers {
runHandler(handler)
}
}
// Exit runs all the Logrus atexit handlers and then terminates the program using os.Exit(code)
func Exit(code int) {
runHandlers()
os.Exit(code)
}
// RegisterExitHandler adds a Logrus Exit handler, call logrus.Exit to invoke
// all handlers. The handlers will also be invoked when any Fatal log entry is
// made.
//
// This method is useful when a caller wishes to use logrus to log a fatal
// message but also needs to gracefully shutdown. An example usecase could be
// closing database connections, or sending a alert that the application is
// closing.
func RegisterExitHandler(handler func()) {
handlers = append(handlers, handler)
}

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/*
Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
The simplest way to use Logrus is simply the package-level exported logger:
package main
import (
log "github.com/Sirupsen/logrus"
)
func main() {
log.WithFields(log.Fields{
"animal": "walrus",
"number": 1,
"size": 10,
}).Info("A walrus appears")
}
Output:
time="2015-09-07T08:48:33Z" level=info msg="A walrus appears" animal=walrus number=1 size=10
For a full guide visit https://github.com/Sirupsen/logrus
*/
package logrus

275
vendor/github.com/Sirupsen/logrus/entry.go generated vendored Normal file
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@ -0,0 +1,275 @@
package logrus
import (
"bytes"
"fmt"
"os"
"sync"
"time"
)
var bufferPool *sync.Pool
func init() {
bufferPool = &sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
}
// Defines the key when adding errors using WithError.
var ErrorKey = "error"
// An entry is the final or intermediate Logrus logging entry. It contains all
// the fields passed with WithField{,s}. It's finally logged when Debug, Info,
// Warn, Error, Fatal or Panic is called on it. These objects can be reused and
// passed around as much as you wish to avoid field duplication.
type Entry struct {
Logger *Logger
// Contains all the fields set by the user.
Data Fields
// Time at which the log entry was created
Time time.Time
// Level the log entry was logged at: Debug, Info, Warn, Error, Fatal or Panic
Level Level
// Message passed to Debug, Info, Warn, Error, Fatal or Panic
Message string
// When formatter is called in entry.log(), an Buffer may be set to entry
Buffer *bytes.Buffer
}
func NewEntry(logger *Logger) *Entry {
return &Entry{
Logger: logger,
// Default is three fields, give a little extra room
Data: make(Fields, 5),
}
}
// Returns the string representation from the reader and ultimately the
// formatter.
func (entry *Entry) String() (string, error) {
serialized, err := entry.Logger.Formatter.Format(entry)
if err != nil {
return "", err
}
str := string(serialized)
return str, nil
}
// Add an error as single field (using the key defined in ErrorKey) to the Entry.
func (entry *Entry) WithError(err error) *Entry {
return entry.WithField(ErrorKey, err)
}
// Add a single field to the Entry.
func (entry *Entry) WithField(key string, value interface{}) *Entry {
return entry.WithFields(Fields{key: value})
}
// Add a map of fields to the Entry.
func (entry *Entry) WithFields(fields Fields) *Entry {
data := make(Fields, len(entry.Data)+len(fields))
for k, v := range entry.Data {
data[k] = v
}
for k, v := range fields {
data[k] = v
}
return &Entry{Logger: entry.Logger, Data: data}
}
// This function is not declared with a pointer value because otherwise
// race conditions will occur when using multiple goroutines
func (entry Entry) log(level Level, msg string) {
var buffer *bytes.Buffer
entry.Time = time.Now()
entry.Level = level
entry.Message = msg
if err := entry.Logger.Hooks.Fire(level, &entry); err != nil {
entry.Logger.mu.Lock()
fmt.Fprintf(os.Stderr, "Failed to fire hook: %v\n", err)
entry.Logger.mu.Unlock()
}
buffer = bufferPool.Get().(*bytes.Buffer)
buffer.Reset()
defer bufferPool.Put(buffer)
entry.Buffer = buffer
serialized, err := entry.Logger.Formatter.Format(&entry)
entry.Buffer = nil
if err != nil {
entry.Logger.mu.Lock()
fmt.Fprintf(os.Stderr, "Failed to obtain reader, %v\n", err)
entry.Logger.mu.Unlock()
} else {
entry.Logger.mu.Lock()
_, err = entry.Logger.Out.Write(serialized)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to write to log, %v\n", err)
}
entry.Logger.mu.Unlock()
}
// To avoid Entry#log() returning a value that only would make sense for
// panic() to use in Entry#Panic(), we avoid the allocation by checking
// directly here.
if level <= PanicLevel {
panic(&entry)
}
}
func (entry *Entry) Debug(args ...interface{}) {
if entry.Logger.Level >= DebugLevel {
entry.log(DebugLevel, fmt.Sprint(args...))
}
}
func (entry *Entry) Print(args ...interface{}) {
entry.Info(args...)
}
func (entry *Entry) Info(args ...interface{}) {
if entry.Logger.Level >= InfoLevel {
entry.log(InfoLevel, fmt.Sprint(args...))
}
}
func (entry *Entry) Warn(args ...interface{}) {
if entry.Logger.Level >= WarnLevel {
entry.log(WarnLevel, fmt.Sprint(args...))
}
}
func (entry *Entry) Warning(args ...interface{}) {
entry.Warn(args...)
}
func (entry *Entry) Error(args ...interface{}) {
if entry.Logger.Level >= ErrorLevel {
entry.log(ErrorLevel, fmt.Sprint(args...))
}
}
func (entry *Entry) Fatal(args ...interface{}) {
if entry.Logger.Level >= FatalLevel {
entry.log(FatalLevel, fmt.Sprint(args...))
}
Exit(1)
}
func (entry *Entry) Panic(args ...interface{}) {
if entry.Logger.Level >= PanicLevel {
entry.log(PanicLevel, fmt.Sprint(args...))
}
panic(fmt.Sprint(args...))
}
// Entry Printf family functions
func (entry *Entry) Debugf(format string, args ...interface{}) {
if entry.Logger.Level >= DebugLevel {
entry.Debug(fmt.Sprintf(format, args...))
}
}
func (entry *Entry) Infof(format string, args ...interface{}) {
if entry.Logger.Level >= InfoLevel {
entry.Info(fmt.Sprintf(format, args...))
}
}
func (entry *Entry) Printf(format string, args ...interface{}) {
entry.Infof(format, args...)
}
func (entry *Entry) Warnf(format string, args ...interface{}) {
if entry.Logger.Level >= WarnLevel {
entry.Warn(fmt.Sprintf(format, args...))
}
}
func (entry *Entry) Warningf(format string, args ...interface{}) {
entry.Warnf(format, args...)
}
func (entry *Entry) Errorf(format string, args ...interface{}) {
if entry.Logger.Level >= ErrorLevel {
entry.Error(fmt.Sprintf(format, args...))
}
}
func (entry *Entry) Fatalf(format string, args ...interface{}) {
if entry.Logger.Level >= FatalLevel {
entry.Fatal(fmt.Sprintf(format, args...))
}
Exit(1)
}
func (entry *Entry) Panicf(format string, args ...interface{}) {
if entry.Logger.Level >= PanicLevel {
entry.Panic(fmt.Sprintf(format, args...))
}
}
// Entry Println family functions
func (entry *Entry) Debugln(args ...interface{}) {
if entry.Logger.Level >= DebugLevel {
entry.Debug(entry.sprintlnn(args...))
}
}
func (entry *Entry) Infoln(args ...interface{}) {
if entry.Logger.Level >= InfoLevel {
entry.Info(entry.sprintlnn(args...))
}
}
func (entry *Entry) Println(args ...interface{}) {
entry.Infoln(args...)
}
func (entry *Entry) Warnln(args ...interface{}) {
if entry.Logger.Level >= WarnLevel {
entry.Warn(entry.sprintlnn(args...))
}
}
func (entry *Entry) Warningln(args ...interface{}) {
entry.Warnln(args...)
}
func (entry *Entry) Errorln(args ...interface{}) {
if entry.Logger.Level >= ErrorLevel {
entry.Error(entry.sprintlnn(args...))
}
}
func (entry *Entry) Fatalln(args ...interface{}) {
if entry.Logger.Level >= FatalLevel {
entry.Fatal(entry.sprintlnn(args...))
}
Exit(1)
}
func (entry *Entry) Panicln(args ...interface{}) {
if entry.Logger.Level >= PanicLevel {
entry.Panic(entry.sprintlnn(args...))
}
}
// Sprintlnn => Sprint no newline. This is to get the behavior of how
// fmt.Sprintln where spaces are always added between operands, regardless of
// their type. Instead of vendoring the Sprintln implementation to spare a
// string allocation, we do the simplest thing.
func (entry *Entry) sprintlnn(args ...interface{}) string {
msg := fmt.Sprintln(args...)
return msg[:len(msg)-1]
}

193
vendor/github.com/Sirupsen/logrus/exported.go generated vendored Normal file
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package logrus
import (
"io"
)
var (
// std is the name of the standard logger in stdlib `log`
std = New()
)
func StandardLogger() *Logger {
return std
}
// SetOutput sets the standard logger output.
func SetOutput(out io.Writer) {
std.mu.Lock()
defer std.mu.Unlock()
std.Out = out
}
// SetFormatter sets the standard logger formatter.
func SetFormatter(formatter Formatter) {
std.mu.Lock()
defer std.mu.Unlock()
std.Formatter = formatter
}
// SetLevel sets the standard logger level.
func SetLevel(level Level) {
std.mu.Lock()
defer std.mu.Unlock()
std.Level = level
}
// GetLevel returns the standard logger level.
func GetLevel() Level {
std.mu.Lock()
defer std.mu.Unlock()
return std.Level
}
// AddHook adds a hook to the standard logger hooks.
func AddHook(hook Hook) {
std.mu.Lock()
defer std.mu.Unlock()
std.Hooks.Add(hook)
}
// WithError creates an entry from the standard logger and adds an error to it, using the value defined in ErrorKey as key.
func WithError(err error) *Entry {
return std.WithField(ErrorKey, err)
}
// WithField creates an entry from the standard logger and adds a field to
// it. If you want multiple fields, use `WithFields`.
//
// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
// or Panic on the Entry it returns.
func WithField(key string, value interface{}) *Entry {
return std.WithField(key, value)
}
// WithFields creates an entry from the standard logger and adds multiple
// fields to it. This is simply a helper for `WithField`, invoking it
// once for each field.
//
// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
// or Panic on the Entry it returns.
func WithFields(fields Fields) *Entry {
return std.WithFields(fields)
}
// Debug logs a message at level Debug on the standard logger.
func Debug(args ...interface{}) {
std.Debug(args...)
}
// Print logs a message at level Info on the standard logger.
func Print(args ...interface{}) {
std.Print(args...)
}
// Info logs a message at level Info on the standard logger.
func Info(args ...interface{}) {
std.Info(args...)
}
// Warn logs a message at level Warn on the standard logger.
func Warn(args ...interface{}) {
std.Warn(args...)
}
// Warning logs a message at level Warn on the standard logger.
func Warning(args ...interface{}) {
std.Warning(args...)
}
// Error logs a message at level Error on the standard logger.
func Error(args ...interface{}) {
std.Error(args...)
}
// Panic logs a message at level Panic on the standard logger.
func Panic(args ...interface{}) {
std.Panic(args...)
}
// Fatal logs a message at level Fatal on the standard logger.
func Fatal(args ...interface{}) {
std.Fatal(args...)
}
// Debugf logs a message at level Debug on the standard logger.
func Debugf(format string, args ...interface{}) {
std.Debugf(format, args...)
}
// Printf logs a message at level Info on the standard logger.
func Printf(format string, args ...interface{}) {
std.Printf(format, args...)
}
// Infof logs a message at level Info on the standard logger.
func Infof(format string, args ...interface{}) {
std.Infof(format, args...)
}
// Warnf logs a message at level Warn on the standard logger.
func Warnf(format string, args ...interface{}) {
std.Warnf(format, args...)
}
// Warningf logs a message at level Warn on the standard logger.
func Warningf(format string, args ...interface{}) {
std.Warningf(format, args...)
}
// Errorf logs a message at level Error on the standard logger.
func Errorf(format string, args ...interface{}) {
std.Errorf(format, args...)
}
// Panicf logs a message at level Panic on the standard logger.
func Panicf(format string, args ...interface{}) {
std.Panicf(format, args...)
}
// Fatalf logs a message at level Fatal on the standard logger.
func Fatalf(format string, args ...interface{}) {
std.Fatalf(format, args...)
}
// Debugln logs a message at level Debug on the standard logger.
func Debugln(args ...interface{}) {
std.Debugln(args...)
}
// Println logs a message at level Info on the standard logger.
func Println(args ...interface{}) {
std.Println(args...)
}
// Infoln logs a message at level Info on the standard logger.
func Infoln(args ...interface{}) {
std.Infoln(args...)
}
// Warnln logs a message at level Warn on the standard logger.
func Warnln(args ...interface{}) {
std.Warnln(args...)
}
// Warningln logs a message at level Warn on the standard logger.
func Warningln(args ...interface{}) {
std.Warningln(args...)
}
// Errorln logs a message at level Error on the standard logger.
func Errorln(args ...interface{}) {
std.Errorln(args...)
}
// Panicln logs a message at level Panic on the standard logger.
func Panicln(args ...interface{}) {
std.Panicln(args...)
}
// Fatalln logs a message at level Fatal on the standard logger.
func Fatalln(args ...interface{}) {
std.Fatalln(args...)
}

45
vendor/github.com/Sirupsen/logrus/formatter.go generated vendored Normal file
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package logrus
import "time"
const DefaultTimestampFormat = time.RFC3339
// The Formatter interface is used to implement a custom Formatter. It takes an
// `Entry`. It exposes all the fields, including the default ones:
//
// * `entry.Data["msg"]`. The message passed from Info, Warn, Error ..
// * `entry.Data["time"]`. The timestamp.
// * `entry.Data["level"]. The level the entry was logged at.
//
// Any additional fields added with `WithField` or `WithFields` are also in
// `entry.Data`. Format is expected to return an array of bytes which are then
// logged to `logger.Out`.
type Formatter interface {
Format(*Entry) ([]byte, error)
}
// This is to not silently overwrite `time`, `msg` and `level` fields when
// dumping it. If this code wasn't there doing:
//
// logrus.WithField("level", 1).Info("hello")
//
// Would just silently drop the user provided level. Instead with this code
// it'll logged as:
//
// {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."}
//
// It's not exported because it's still using Data in an opinionated way. It's to
// avoid code duplication between the two default formatters.
func prefixFieldClashes(data Fields) {
if t, ok := data["time"]; ok {
data["fields.time"] = t
}
if m, ok := data["msg"]; ok {
data["fields.msg"] = m
}
if l, ok := data["level"]; ok {
data["fields.level"] = l
}
}

34
vendor/github.com/Sirupsen/logrus/hooks.go generated vendored Normal file
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package logrus
// A hook to be fired when logging on the logging levels returned from
// `Levels()` on your implementation of the interface. Note that this is not
// fired in a goroutine or a channel with workers, you should handle such
// functionality yourself if your call is non-blocking and you don't wish for
// the logging calls for levels returned from `Levels()` to block.
type Hook interface {
Levels() []Level
Fire(*Entry) error
}
// Internal type for storing the hooks on a logger instance.
type LevelHooks map[Level][]Hook
// Add a hook to an instance of logger. This is called with
// `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.
func (hooks LevelHooks) Add(hook Hook) {
for _, level := range hook.Levels() {
hooks[level] = append(hooks[level], hook)
}
}
// Fire all the hooks for the passed level. Used by `entry.log` to fire
// appropriate hooks for a log entry.
func (hooks LevelHooks) Fire(level Level, entry *Entry) error {
for _, hook := range hooks[level] {
if err := hook.Fire(entry); err != nil {
return err
}
}
return nil
}

41
vendor/github.com/Sirupsen/logrus/json_formatter.go generated vendored Normal file
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package logrus
import (
"encoding/json"
"fmt"
)
type JSONFormatter struct {
// TimestampFormat sets the format used for marshaling timestamps.
TimestampFormat string
}
func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
data := make(Fields, len(entry.Data)+3)
for k, v := range entry.Data {
switch v := v.(type) {
case error:
// Otherwise errors are ignored by `encoding/json`
// https://github.com/Sirupsen/logrus/issues/137
data[k] = v.Error()
default:
data[k] = v
}
}
prefixFieldClashes(data)
timestampFormat := f.TimestampFormat
if timestampFormat == "" {
timestampFormat = DefaultTimestampFormat
}
data["time"] = entry.Time.Format(timestampFormat)
data["msg"] = entry.Message
data["level"] = entry.Level.String()
serialized, err := json.Marshal(data)
if err != nil {
return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
}
return append(serialized, '\n'), nil
}

308
vendor/github.com/Sirupsen/logrus/logger.go generated vendored Normal file
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package logrus
import (
"io"
"os"
"sync"
)
type Logger struct {
// The logs are `io.Copy`'d to this in a mutex. It's common to set this to a
// file, or leave it default which is `os.Stderr`. You can also set this to
// something more adventorous, such as logging to Kafka.
Out io.Writer
// Hooks for the logger instance. These allow firing events based on logging
// levels and log entries. For example, to send errors to an error tracking
// service, log to StatsD or dump the core on fatal errors.
Hooks LevelHooks
// All log entries pass through the formatter before logged to Out. The
// included formatters are `TextFormatter` and `JSONFormatter` for which
// TextFormatter is the default. In development (when a TTY is attached) it
// logs with colors, but to a file it wouldn't. You can easily implement your
// own that implements the `Formatter` interface, see the `README` or included
// formatters for examples.
Formatter Formatter
// The logging level the logger should log at. This is typically (and defaults
// to) `logrus.Info`, which allows Info(), Warn(), Error() and Fatal() to be
// logged. `logrus.Debug` is useful in
Level Level
// Used to sync writing to the log. Locking is enabled by Default
mu MutexWrap
// Reusable empty entry
entryPool sync.Pool
}
type MutexWrap struct {
lock sync.Mutex
disabled bool
}
func (mw *MutexWrap) Lock() {
if !mw.disabled {
mw.lock.Lock()
}
}
func (mw *MutexWrap) Unlock() {
if !mw.disabled {
mw.lock.Unlock()
}
}
func (mw *MutexWrap) Disable() {
mw.disabled = true
}
// Creates a new logger. Configuration should be set by changing `Formatter`,
// `Out` and `Hooks` directly on the default logger instance. You can also just
// instantiate your own:
//
// var log = &Logger{
// Out: os.Stderr,
// Formatter: new(JSONFormatter),
// Hooks: make(LevelHooks),
// Level: logrus.DebugLevel,
// }
//
// It's recommended to make this a global instance called `log`.
func New() *Logger {
return &Logger{
Out: os.Stderr,
Formatter: new(TextFormatter),
Hooks: make(LevelHooks),
Level: InfoLevel,
}
}
func (logger *Logger) newEntry() *Entry {
entry, ok := logger.entryPool.Get().(*Entry)
if ok {
return entry
}
return NewEntry(logger)
}
func (logger *Logger) releaseEntry(entry *Entry) {
logger.entryPool.Put(entry)
}
// Adds a field to the log entry, note that it doesn't log until you call
// Debug, Print, Info, Warn, Fatal or Panic. It only creates a log entry.
// If you want multiple fields, use `WithFields`.
func (logger *Logger) WithField(key string, value interface{}) *Entry {
entry := logger.newEntry()
defer logger.releaseEntry(entry)
return entry.WithField(key, value)
}
// Adds a struct of fields to the log entry. All it does is call `WithField` for
// each `Field`.
func (logger *Logger) WithFields(fields Fields) *Entry {
entry := logger.newEntry()
defer logger.releaseEntry(entry)
return entry.WithFields(fields)
}
// Add an error as single field to the log entry. All it does is call
// `WithError` for the given `error`.
func (logger *Logger) WithError(err error) *Entry {
entry := logger.newEntry()
defer logger.releaseEntry(entry)
return entry.WithError(err)
}
func (logger *Logger) Debugf(format string, args ...interface{}) {
if logger.Level >= DebugLevel {
entry := logger.newEntry()
entry.Debugf(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Infof(format string, args ...interface{}) {
if logger.Level >= InfoLevel {
entry := logger.newEntry()
entry.Infof(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Printf(format string, args ...interface{}) {
entry := logger.newEntry()
entry.Printf(format, args...)
logger.releaseEntry(entry)
}
func (logger *Logger) Warnf(format string, args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warnf(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Warningf(format string, args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warnf(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Errorf(format string, args ...interface{}) {
if logger.Level >= ErrorLevel {
entry := logger.newEntry()
entry.Errorf(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Fatalf(format string, args ...interface{}) {
if logger.Level >= FatalLevel {
entry := logger.newEntry()
entry.Fatalf(format, args...)
logger.releaseEntry(entry)
}
Exit(1)
}
func (logger *Logger) Panicf(format string, args ...interface{}) {
if logger.Level >= PanicLevel {
entry := logger.newEntry()
entry.Panicf(format, args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Debug(args ...interface{}) {
if logger.Level >= DebugLevel {
entry := logger.newEntry()
entry.Debug(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Info(args ...interface{}) {
if logger.Level >= InfoLevel {
entry := logger.newEntry()
entry.Info(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Print(args ...interface{}) {
entry := logger.newEntry()
entry.Info(args...)
logger.releaseEntry(entry)
}
func (logger *Logger) Warn(args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warn(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Warning(args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warn(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Error(args ...interface{}) {
if logger.Level >= ErrorLevel {
entry := logger.newEntry()
entry.Error(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Fatal(args ...interface{}) {
if logger.Level >= FatalLevel {
entry := logger.newEntry()
entry.Fatal(args...)
logger.releaseEntry(entry)
}
Exit(1)
}
func (logger *Logger) Panic(args ...interface{}) {
if logger.Level >= PanicLevel {
entry := logger.newEntry()
entry.Panic(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Debugln(args ...interface{}) {
if logger.Level >= DebugLevel {
entry := logger.newEntry()
entry.Debugln(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Infoln(args ...interface{}) {
if logger.Level >= InfoLevel {
entry := logger.newEntry()
entry.Infoln(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Println(args ...interface{}) {
entry := logger.newEntry()
entry.Println(args...)
logger.releaseEntry(entry)
}
func (logger *Logger) Warnln(args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warnln(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Warningln(args ...interface{}) {
if logger.Level >= WarnLevel {
entry := logger.newEntry()
entry.Warnln(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Errorln(args ...interface{}) {
if logger.Level >= ErrorLevel {
entry := logger.newEntry()
entry.Errorln(args...)
logger.releaseEntry(entry)
}
}
func (logger *Logger) Fatalln(args ...interface{}) {
if logger.Level >= FatalLevel {
entry := logger.newEntry()
entry.Fatalln(args...)
logger.releaseEntry(entry)
}
Exit(1)
}
func (logger *Logger) Panicln(args ...interface{}) {
if logger.Level >= PanicLevel {
entry := logger.newEntry()
entry.Panicln(args...)
logger.releaseEntry(entry)
}
}
//When file is opened with appending mode, it's safe to
//write concurrently to a file (within 4k message on Linux).
//In these cases user can choose to disable the lock.
func (logger *Logger) SetNoLock() {
logger.mu.Disable()
}

143
vendor/github.com/Sirupsen/logrus/logrus.go generated vendored Normal file
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package logrus
import (
"fmt"
"log"
"strings"
)
// Fields type, used to pass to `WithFields`.
type Fields map[string]interface{}
// Level type
type Level uint8
// Convert the Level to a string. E.g. PanicLevel becomes "panic".
func (level Level) String() string {
switch level {
case DebugLevel:
return "debug"
case InfoLevel:
return "info"
case WarnLevel:
return "warning"
case ErrorLevel:
return "error"
case FatalLevel:
return "fatal"
case PanicLevel:
return "panic"
}
return "unknown"
}
// ParseLevel takes a string level and returns the Logrus log level constant.
func ParseLevel(lvl string) (Level, error) {
switch strings.ToLower(lvl) {
case "panic":
return PanicLevel, nil
case "fatal":
return FatalLevel, nil
case "error":
return ErrorLevel, nil
case "warn", "warning":
return WarnLevel, nil
case "info":
return InfoLevel, nil
case "debug":
return DebugLevel, nil
}
var l Level
return l, fmt.Errorf("not a valid logrus Level: %q", lvl)
}
// A constant exposing all logging levels
var AllLevels = []Level{
PanicLevel,
FatalLevel,
ErrorLevel,
WarnLevel,
InfoLevel,
DebugLevel,
}
// These are the different logging levels. You can set the logging level to log
// on your instance of logger, obtained with `logrus.New()`.
const (
// PanicLevel level, highest level of severity. Logs and then calls panic with the
// message passed to Debug, Info, ...
PanicLevel Level = iota
// FatalLevel level. Logs and then calls `os.Exit(1)`. It will exit even if the
// logging level is set to Panic.
FatalLevel
// ErrorLevel level. Logs. Used for errors that should definitely be noted.
// Commonly used for hooks to send errors to an error tracking service.
ErrorLevel
// WarnLevel level. Non-critical entries that deserve eyes.
WarnLevel
// InfoLevel level. General operational entries about what's going on inside the
// application.
InfoLevel
// DebugLevel level. Usually only enabled when debugging. Very verbose logging.
DebugLevel
)
// Won't compile if StdLogger can't be realized by a log.Logger
var (
_ StdLogger = &log.Logger{}
_ StdLogger = &Entry{}
_ StdLogger = &Logger{}
)
// StdLogger is what your logrus-enabled library should take, that way
// it'll accept a stdlib logger and a logrus logger. There's no standard
// interface, this is the closest we get, unfortunately.
type StdLogger interface {
Print(...interface{})
Printf(string, ...interface{})
Println(...interface{})
Fatal(...interface{})
Fatalf(string, ...interface{})
Fatalln(...interface{})
Panic(...interface{})
Panicf(string, ...interface{})
Panicln(...interface{})
}
// The FieldLogger interface generalizes the Entry and Logger types
type FieldLogger interface {
WithField(key string, value interface{}) *Entry
WithFields(fields Fields) *Entry
WithError(err error) *Entry
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
Printf(format string, args ...interface{})
Warnf(format string, args ...interface{})
Warningf(format string, args ...interface{})
Errorf(format string, args ...interface{})
Fatalf(format string, args ...interface{})
Panicf(format string, args ...interface{})
Debug(args ...interface{})
Info(args ...interface{})
Print(args ...interface{})
Warn(args ...interface{})
Warning(args ...interface{})
Error(args ...interface{})
Fatal(args ...interface{})
Panic(args ...interface{})
Debugln(args ...interface{})
Infoln(args ...interface{})
Println(args ...interface{})
Warnln(args ...interface{})
Warningln(args ...interface{})
Errorln(args ...interface{})
Fatalln(args ...interface{})
Panicln(args ...interface{})
}

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// +build appengine
package logrus
// IsTerminal returns true if stderr's file descriptor is a terminal.
func IsTerminal() bool {
return true
}

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// +build darwin freebsd openbsd netbsd dragonfly
// +build !appengine
package logrus
import "syscall"
const ioctlReadTermios = syscall.TIOCGETA
type Termios syscall.Termios

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// Based on ssh/terminal:
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !appengine
package logrus
import "syscall"
const ioctlReadTermios = syscall.TCGETS
type Termios syscall.Termios

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// Based on ssh/terminal:
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux darwin freebsd openbsd netbsd dragonfly
// +build !appengine
package logrus
import (
"syscall"
"unsafe"
)
// IsTerminal returns true if stderr's file descriptor is a terminal.
func IsTerminal() bool {
fd := syscall.Stderr
var termios Termios
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
return err == 0
}

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// +build solaris,!appengine
package logrus
import (
"os"
"golang.org/x/sys/unix"
)
// IsTerminal returns true if the given file descriptor is a terminal.
func IsTerminal() bool {
_, err := unix.IoctlGetTermios(int(os.Stdout.Fd()), unix.TCGETA)
return err == nil
}

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// Based on ssh/terminal:
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows,!appengine
package logrus
import (
"syscall"
"unsafe"
)
var kernel32 = syscall.NewLazyDLL("kernel32.dll")
var (
procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
)
// IsTerminal returns true if stderr's file descriptor is a terminal.
func IsTerminal() bool {
fd := syscall.Stderr
var st uint32
r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
return r != 0 && e == 0
}

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package logrus
import (
"bytes"
"fmt"
"runtime"
"sort"
"strings"
"time"
)
const (
nocolor = 0
red = 31
green = 32
yellow = 33
blue = 34
gray = 37
)
var (
baseTimestamp time.Time
isTerminal bool
)
func init() {
baseTimestamp = time.Now()
isTerminal = IsTerminal()
}
func miniTS() int {
return int(time.Since(baseTimestamp) / time.Second)
}
type TextFormatter struct {
// Set to true to bypass checking for a TTY before outputting colors.
ForceColors bool
// Force disabling colors.
DisableColors bool
// Disable timestamp logging. useful when output is redirected to logging
// system that already adds timestamps.
DisableTimestamp bool
// Enable logging the full timestamp when a TTY is attached instead of just
// the time passed since beginning of execution.
FullTimestamp bool
// TimestampFormat to use for display when a full timestamp is printed
TimestampFormat string
// The fields are sorted by default for a consistent output. For applications
// that log extremely frequently and don't use the JSON formatter this may not
// be desired.
DisableSorting bool
}
func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
var b *bytes.Buffer
var keys []string = make([]string, 0, len(entry.Data))
for k := range entry.Data {
keys = append(keys, k)
}
if !f.DisableSorting {
sort.Strings(keys)
}
if entry.Buffer != nil {
b = entry.Buffer
} else {
b = &bytes.Buffer{}
}
prefixFieldClashes(entry.Data)
isColorTerminal := isTerminal && (runtime.GOOS != "windows")
isColored := (f.ForceColors || isColorTerminal) && !f.DisableColors
timestampFormat := f.TimestampFormat
if timestampFormat == "" {
timestampFormat = DefaultTimestampFormat
}
if isColored {
f.printColored(b, entry, keys, timestampFormat)
} else {
if !f.DisableTimestamp {
f.appendKeyValue(b, "time", entry.Time.Format(timestampFormat))
}
f.appendKeyValue(b, "level", entry.Level.String())
if entry.Message != "" {
f.appendKeyValue(b, "msg", entry.Message)
}
for _, key := range keys {
f.appendKeyValue(b, key, entry.Data[key])
}
}
b.WriteByte('\n')
return b.Bytes(), nil
}
func (f *TextFormatter) printColored(b *bytes.Buffer, entry *Entry, keys []string, timestampFormat string) {
var levelColor int
switch entry.Level {
case DebugLevel:
levelColor = gray
case WarnLevel:
levelColor = yellow
case ErrorLevel, FatalLevel, PanicLevel:
levelColor = red
default:
levelColor = blue
}
levelText := strings.ToUpper(entry.Level.String())[0:4]
if !f.FullTimestamp {
fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%04d] %-44s ", levelColor, levelText, miniTS(), entry.Message)
} else {
fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s] %-44s ", levelColor, levelText, entry.Time.Format(timestampFormat), entry.Message)
}
for _, k := range keys {
v := entry.Data[k]
fmt.Fprintf(b, " \x1b[%dm%s\x1b[0m=%+v", levelColor, k, v)
}
}
func needsQuoting(text string) bool {
for _, ch := range text {
if !((ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch >= '0' && ch <= '9') ||
ch == '-' || ch == '.') {
return true
}
}
return false
}
func (f *TextFormatter) appendKeyValue(b *bytes.Buffer, key string, value interface{}) {
b.WriteString(key)
b.WriteByte('=')
switch value := value.(type) {
case string:
if !needsQuoting(value) {
b.WriteString(value)
} else {
fmt.Fprintf(b, "%q", value)
}
case error:
errmsg := value.Error()
if !needsQuoting(errmsg) {
b.WriteString(errmsg)
} else {
fmt.Fprintf(b, "%q", value)
}
default:
fmt.Fprint(b, value)
}
b.WriteByte(' ')
}

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package logrus
import (
"bufio"
"io"
"runtime"
)
func (logger *Logger) Writer() *io.PipeWriter {
return logger.WriterLevel(InfoLevel)
}
func (logger *Logger) WriterLevel(level Level) *io.PipeWriter {
reader, writer := io.Pipe()
var printFunc func(args ...interface{})
switch level {
case DebugLevel:
printFunc = logger.Debug
case InfoLevel:
printFunc = logger.Info
case WarnLevel:
printFunc = logger.Warn
case ErrorLevel:
printFunc = logger.Error
case FatalLevel:
printFunc = logger.Fatal
case PanicLevel:
printFunc = logger.Panic
default:
printFunc = logger.Print
}
go logger.writerScanner(reader, printFunc)
runtime.SetFinalizer(writer, writerFinalizer)
return writer
}
func (logger *Logger) writerScanner(reader *io.PipeReader, printFunc func(args ...interface{})) {
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
printFunc(scanner.Text())
}
if err := scanner.Err(); err != nil {
logger.Errorf("Error while reading from Writer: %s", err)
}
reader.Close()
}
func writerFinalizer(writer *io.PipeWriter) {
writer.Close()
}

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Copyright (c) 2012 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# Go's `text/template` package with newline elision
This is a fork of Go 1.4's [text/template](http://golang.org/pkg/text/template/) package with one addition: a backslash immediately after a closing delimiter will delete all subsequent newlines until a non-newline.
eg.
```
{{if true}}\
hello
{{end}}\
```
Will result in:
```
hello\n
```
Rather than:
```
\n
hello\n
\n
```

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package template implements data-driven templates for generating textual output.
To generate HTML output, see package html/template, which has the same interface
as this package but automatically secures HTML output against certain attacks.
Templates are executed by applying them to a data structure. Annotations in the
template refer to elements of the data structure (typically a field of a struct
or a key in a map) to control execution and derive values to be displayed.
Execution of the template walks the structure and sets the cursor, represented
by a period '.' and called "dot", to the value at the current location in the
structure as execution proceeds.
The input text for a template is UTF-8-encoded text in any format.
"Actions"--data evaluations or control structures--are delimited by
"{{" and "}}"; all text outside actions is copied to the output unchanged.
Actions may not span newlines, although comments can.
Once parsed, a template may be executed safely in parallel.
Here is a trivial example that prints "17 items are made of wool".
type Inventory struct {
Material string
Count uint
}
sweaters := Inventory{"wool", 17}
tmpl, err := template.New("test").Parse("{{.Count}} items are made of {{.Material}}")
if err != nil { panic(err) }
err = tmpl.Execute(os.Stdout, sweaters)
if err != nil { panic(err) }
More intricate examples appear below.
Actions
Here is the list of actions. "Arguments" and "pipelines" are evaluations of
data, defined in detail below.
*/
// {{/* a comment */}}
// A comment; discarded. May contain newlines.
// Comments do not nest and must start and end at the
// delimiters, as shown here.
/*
{{pipeline}}
The default textual representation of the value of the pipeline
is copied to the output.
{{if pipeline}} T1 {{end}}
If the value of the pipeline is empty, no output is generated;
otherwise, T1 is executed. The empty values are false, 0, any
nil pointer or interface value, and any array, slice, map, or
string of length zero.
Dot is unaffected.
{{if pipeline}} T1 {{else}} T0 {{end}}
If the value of the pipeline is empty, T0 is executed;
otherwise, T1 is executed. Dot is unaffected.
{{if pipeline}} T1 {{else if pipeline}} T0 {{end}}
To simplify the appearance of if-else chains, the else action
of an if may include another if directly; the effect is exactly
the same as writing
{{if pipeline}} T1 {{else}}{{if pipeline}} T0 {{end}}{{end}}
{{range pipeline}} T1 {{end}}
The value of the pipeline must be an array, slice, map, or channel.
If the value of the pipeline has length zero, nothing is output;
otherwise, dot is set to the successive elements of the array,
slice, or map and T1 is executed. If the value is a map and the
keys are of basic type with a defined order ("comparable"), the
elements will be visited in sorted key order.
{{range pipeline}} T1 {{else}} T0 {{end}}
The value of the pipeline must be an array, slice, map, or channel.
If the value of the pipeline has length zero, dot is unaffected and
T0 is executed; otherwise, dot is set to the successive elements
of the array, slice, or map and T1 is executed.
{{template "name"}}
The template with the specified name is executed with nil data.
{{template "name" pipeline}}
The template with the specified name is executed with dot set
to the value of the pipeline.
{{with pipeline}} T1 {{end}}
If the value of the pipeline is empty, no output is generated;
otherwise, dot is set to the value of the pipeline and T1 is
executed.
{{with pipeline}} T1 {{else}} T0 {{end}}
If the value of the pipeline is empty, dot is unaffected and T0
is executed; otherwise, dot is set to the value of the pipeline
and T1 is executed.
Arguments
An argument is a simple value, denoted by one of the following.
- A boolean, string, character, integer, floating-point, imaginary
or complex constant in Go syntax. These behave like Go's untyped
constants, although raw strings may not span newlines.
- The keyword nil, representing an untyped Go nil.
- The character '.' (period):
.
The result is the value of dot.
- A variable name, which is a (possibly empty) alphanumeric string
preceded by a dollar sign, such as
$piOver2
or
$
The result is the value of the variable.
Variables are described below.
- The name of a field of the data, which must be a struct, preceded
by a period, such as
.Field
The result is the value of the field. Field invocations may be
chained:
.Field1.Field2
Fields can also be evaluated on variables, including chaining:
$x.Field1.Field2
- The name of a key of the data, which must be a map, preceded
by a period, such as
.Key
The result is the map element value indexed by the key.
Key invocations may be chained and combined with fields to any
depth:
.Field1.Key1.Field2.Key2
Although the key must be an alphanumeric identifier, unlike with
field names they do not need to start with an upper case letter.
Keys can also be evaluated on variables, including chaining:
$x.key1.key2
- The name of a niladic method of the data, preceded by a period,
such as
.Method
The result is the value of invoking the method with dot as the
receiver, dot.Method(). Such a method must have one return value (of
any type) or two return values, the second of which is an error.
If it has two and the returned error is non-nil, execution terminates
and an error is returned to the caller as the value of Execute.
Method invocations may be chained and combined with fields and keys
to any depth:
.Field1.Key1.Method1.Field2.Key2.Method2
Methods can also be evaluated on variables, including chaining:
$x.Method1.Field
- The name of a niladic function, such as
fun
The result is the value of invoking the function, fun(). The return
types and values behave as in methods. Functions and function
names are described below.
- A parenthesized instance of one the above, for grouping. The result
may be accessed by a field or map key invocation.
print (.F1 arg1) (.F2 arg2)
(.StructValuedMethod "arg").Field
Arguments may evaluate to any type; if they are pointers the implementation
automatically indirects to the base type when required.
If an evaluation yields a function value, such as a function-valued
field of a struct, the function is not invoked automatically, but it
can be used as a truth value for an if action and the like. To invoke
it, use the call function, defined below.
A pipeline is a possibly chained sequence of "commands". A command is a simple
value (argument) or a function or method call, possibly with multiple arguments:
Argument
The result is the value of evaluating the argument.
.Method [Argument...]
The method can be alone or the last element of a chain but,
unlike methods in the middle of a chain, it can take arguments.
The result is the value of calling the method with the
arguments:
dot.Method(Argument1, etc.)
functionName [Argument...]
The result is the value of calling the function associated
with the name:
function(Argument1, etc.)
Functions and function names are described below.
Pipelines
A pipeline may be "chained" by separating a sequence of commands with pipeline
characters '|'. In a chained pipeline, the result of the each command is
passed as the last argument of the following command. The output of the final
command in the pipeline is the value of the pipeline.
The output of a command will be either one value or two values, the second of
which has type error. If that second value is present and evaluates to
non-nil, execution terminates and the error is returned to the caller of
Execute.
Variables
A pipeline inside an action may initialize a variable to capture the result.
The initialization has syntax
$variable := pipeline
where $variable is the name of the variable. An action that declares a
variable produces no output.
If a "range" action initializes a variable, the variable is set to the
successive elements of the iteration. Also, a "range" may declare two
variables, separated by a comma:
range $index, $element := pipeline
in which case $index and $element are set to the successive values of the
array/slice index or map key and element, respectively. Note that if there is
only one variable, it is assigned the element; this is opposite to the
convention in Go range clauses.
A variable's scope extends to the "end" action of the control structure ("if",
"with", or "range") in which it is declared, or to the end of the template if
there is no such control structure. A template invocation does not inherit
variables from the point of its invocation.
When execution begins, $ is set to the data argument passed to Execute, that is,
to the starting value of dot.
Examples
Here are some example one-line templates demonstrating pipelines and variables.
All produce the quoted word "output":
{{"\"output\""}}
A string constant.
{{`"output"`}}
A raw string constant.
{{printf "%q" "output"}}
A function call.
{{"output" | printf "%q"}}
A function call whose final argument comes from the previous
command.
{{printf "%q" (print "out" "put")}}
A parenthesized argument.
{{"put" | printf "%s%s" "out" | printf "%q"}}
A more elaborate call.
{{"output" | printf "%s" | printf "%q"}}
A longer chain.
{{with "output"}}{{printf "%q" .}}{{end}}
A with action using dot.
{{with $x := "output" | printf "%q"}}{{$x}}{{end}}
A with action that creates and uses a variable.
{{with $x := "output"}}{{printf "%q" $x}}{{end}}
A with action that uses the variable in another action.
{{with $x := "output"}}{{$x | printf "%q"}}{{end}}
The same, but pipelined.
Functions
During execution functions are found in two function maps: first in the
template, then in the global function map. By default, no functions are defined
in the template but the Funcs method can be used to add them.
Predefined global functions are named as follows.
and
Returns the boolean AND of its arguments by returning the
first empty argument or the last argument, that is,
"and x y" behaves as "if x then y else x". All the
arguments are evaluated.
call
Returns the result of calling the first argument, which
must be a function, with the remaining arguments as parameters.
Thus "call .X.Y 1 2" is, in Go notation, dot.X.Y(1, 2) where
Y is a func-valued field, map entry, or the like.
The first argument must be the result of an evaluation
that yields a value of function type (as distinct from
a predefined function such as print). The function must
return either one or two result values, the second of which
is of type error. If the arguments don't match the function
or the returned error value is non-nil, execution stops.
html
Returns the escaped HTML equivalent of the textual
representation of its arguments.
index
Returns the result of indexing its first argument by the
following arguments. Thus "index x 1 2 3" is, in Go syntax,
x[1][2][3]. Each indexed item must be a map, slice, or array.
js
Returns the escaped JavaScript equivalent of the textual
representation of its arguments.
len
Returns the integer length of its argument.
not
Returns the boolean negation of its single argument.
or
Returns the boolean OR of its arguments by returning the
first non-empty argument or the last argument, that is,
"or x y" behaves as "if x then x else y". All the
arguments are evaluated.
print
An alias for fmt.Sprint
printf
An alias for fmt.Sprintf
println
An alias for fmt.Sprintln
urlquery
Returns the escaped value of the textual representation of
its arguments in a form suitable for embedding in a URL query.
The boolean functions take any zero value to be false and a non-zero
value to be true.
There is also a set of binary comparison operators defined as
functions:
eq
Returns the boolean truth of arg1 == arg2
ne
Returns the boolean truth of arg1 != arg2
lt
Returns the boolean truth of arg1 < arg2
le
Returns the boolean truth of arg1 <= arg2
gt
Returns the boolean truth of arg1 > arg2
ge
Returns the boolean truth of arg1 >= arg2
For simpler multi-way equality tests, eq (only) accepts two or more
arguments and compares the second and subsequent to the first,
returning in effect
arg1==arg2 || arg1==arg3 || arg1==arg4 ...
(Unlike with || in Go, however, eq is a function call and all the
arguments will be evaluated.)
The comparison functions work on basic types only (or named basic
types, such as "type Celsius float32"). They implement the Go rules
for comparison of values, except that size and exact type are
ignored, so any integer value, signed or unsigned, may be compared
with any other integer value. (The arithmetic value is compared,
not the bit pattern, so all negative integers are less than all
unsigned integers.) However, as usual, one may not compare an int
with a float32 and so on.
Associated templates
Each template is named by a string specified when it is created. Also, each
template is associated with zero or more other templates that it may invoke by
name; such associations are transitive and form a name space of templates.
A template may use a template invocation to instantiate another associated
template; see the explanation of the "template" action above. The name must be
that of a template associated with the template that contains the invocation.
Nested template definitions
When parsing a template, another template may be defined and associated with the
template being parsed. Template definitions must appear at the top level of the
template, much like global variables in a Go program.
The syntax of such definitions is to surround each template declaration with a
"define" and "end" action.
The define action names the template being created by providing a string
constant. Here is a simple example:
`{{define "T1"}}ONE{{end}}
{{define "T2"}}TWO{{end}}
{{define "T3"}}{{template "T1"}} {{template "T2"}}{{end}}
{{template "T3"}}`
This defines two templates, T1 and T2, and a third T3 that invokes the other two
when it is executed. Finally it invokes T3. If executed this template will
produce the text
ONE TWO
By construction, a template may reside in only one association. If it's
necessary to have a template addressable from multiple associations, the
template definition must be parsed multiple times to create distinct *Template
values, or must be copied with the Clone or AddParseTree method.
Parse may be called multiple times to assemble the various associated templates;
see the ParseFiles and ParseGlob functions and methods for simple ways to parse
related templates stored in files.
A template may be executed directly or through ExecuteTemplate, which executes
an associated template identified by name. To invoke our example above, we
might write,
err := tmpl.Execute(os.Stdout, "no data needed")
if err != nil {
log.Fatalf("execution failed: %s", err)
}
or to invoke a particular template explicitly by name,
err := tmpl.ExecuteTemplate(os.Stdout, "T2", "no data needed")
if err != nil {
log.Fatalf("execution failed: %s", err)
}
*/
package template

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@ -0,0 +1,845 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"bytes"
"fmt"
"io"
"reflect"
"runtime"
"sort"
"strings"
"github.com/alecthomas/template/parse"
)
// state represents the state of an execution. It's not part of the
// template so that multiple executions of the same template
// can execute in parallel.
type state struct {
tmpl *Template
wr io.Writer
node parse.Node // current node, for errors
vars []variable // push-down stack of variable values.
}
// variable holds the dynamic value of a variable such as $, $x etc.
type variable struct {
name string
value reflect.Value
}
// push pushes a new variable on the stack.
func (s *state) push(name string, value reflect.Value) {
s.vars = append(s.vars, variable{name, value})
}
// mark returns the length of the variable stack.
func (s *state) mark() int {
return len(s.vars)
}
// pop pops the variable stack up to the mark.
func (s *state) pop(mark int) {
s.vars = s.vars[0:mark]
}
// setVar overwrites the top-nth variable on the stack. Used by range iterations.
func (s *state) setVar(n int, value reflect.Value) {
s.vars[len(s.vars)-n].value = value
}
// varValue returns the value of the named variable.
func (s *state) varValue(name string) reflect.Value {
for i := s.mark() - 1; i >= 0; i-- {
if s.vars[i].name == name {
return s.vars[i].value
}
}
s.errorf("undefined variable: %s", name)
return zero
}
var zero reflect.Value
// at marks the state to be on node n, for error reporting.
func (s *state) at(node parse.Node) {
s.node = node
}
// doublePercent returns the string with %'s replaced by %%, if necessary,
// so it can be used safely inside a Printf format string.
func doublePercent(str string) string {
if strings.Contains(str, "%") {
str = strings.Replace(str, "%", "%%", -1)
}
return str
}
// errorf formats the error and terminates processing.
func (s *state) errorf(format string, args ...interface{}) {
name := doublePercent(s.tmpl.Name())
if s.node == nil {
format = fmt.Sprintf("template: %s: %s", name, format)
} else {
location, context := s.tmpl.ErrorContext(s.node)
format = fmt.Sprintf("template: %s: executing %q at <%s>: %s", location, name, doublePercent(context), format)
}
panic(fmt.Errorf(format, args...))
}
// errRecover is the handler that turns panics into returns from the top
// level of Parse.
func errRecover(errp *error) {
e := recover()
if e != nil {
switch err := e.(type) {
case runtime.Error:
panic(e)
case error:
*errp = err
default:
panic(e)
}
}
}
// ExecuteTemplate applies the template associated with t that has the given name
// to the specified data object and writes the output to wr.
// If an error occurs executing the template or writing its output,
// execution stops, but partial results may already have been written to
// the output writer.
// A template may be executed safely in parallel.
func (t *Template) ExecuteTemplate(wr io.Writer, name string, data interface{}) error {
tmpl := t.tmpl[name]
if tmpl == nil {
return fmt.Errorf("template: no template %q associated with template %q", name, t.name)
}
return tmpl.Execute(wr, data)
}
// Execute applies a parsed template to the specified data object,
// and writes the output to wr.
// If an error occurs executing the template or writing its output,
// execution stops, but partial results may already have been written to
// the output writer.
// A template may be executed safely in parallel.
func (t *Template) Execute(wr io.Writer, data interface{}) (err error) {
defer errRecover(&err)
value := reflect.ValueOf(data)
state := &state{
tmpl: t,
wr: wr,
vars: []variable{{"$", value}},
}
t.init()
if t.Tree == nil || t.Root == nil {
var b bytes.Buffer
for name, tmpl := range t.tmpl {
if tmpl.Tree == nil || tmpl.Root == nil {
continue
}
if b.Len() > 0 {
b.WriteString(", ")
}
fmt.Fprintf(&b, "%q", name)
}
var s string
if b.Len() > 0 {
s = "; defined templates are: " + b.String()
}
state.errorf("%q is an incomplete or empty template%s", t.Name(), s)
}
state.walk(value, t.Root)
return
}
// Walk functions step through the major pieces of the template structure,
// generating output as they go.
func (s *state) walk(dot reflect.Value, node parse.Node) {
s.at(node)
switch node := node.(type) {
case *parse.ActionNode:
// Do not pop variables so they persist until next end.
// Also, if the action declares variables, don't print the result.
val := s.evalPipeline(dot, node.Pipe)
if len(node.Pipe.Decl) == 0 {
s.printValue(node, val)
}
case *parse.IfNode:
s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList)
case *parse.ListNode:
for _, node := range node.Nodes {
s.walk(dot, node)
}
case *parse.RangeNode:
s.walkRange(dot, node)
case *parse.TemplateNode:
s.walkTemplate(dot, node)
case *parse.TextNode:
if _, err := s.wr.Write(node.Text); err != nil {
s.errorf("%s", err)
}
case *parse.WithNode:
s.walkIfOrWith(parse.NodeWith, dot, node.Pipe, node.List, node.ElseList)
default:
s.errorf("unknown node: %s", node)
}
}
// walkIfOrWith walks an 'if' or 'with' node. The two control structures
// are identical in behavior except that 'with' sets dot.
func (s *state) walkIfOrWith(typ parse.NodeType, dot reflect.Value, pipe *parse.PipeNode, list, elseList *parse.ListNode) {
defer s.pop(s.mark())
val := s.evalPipeline(dot, pipe)
truth, ok := isTrue(val)
if !ok {
s.errorf("if/with can't use %v", val)
}
if truth {
if typ == parse.NodeWith {
s.walk(val, list)
} else {
s.walk(dot, list)
}
} else if elseList != nil {
s.walk(dot, elseList)
}
}
// isTrue reports whether the value is 'true', in the sense of not the zero of its type,
// and whether the value has a meaningful truth value.
func isTrue(val reflect.Value) (truth, ok bool) {
if !val.IsValid() {
// Something like var x interface{}, never set. It's a form of nil.
return false, true
}
switch val.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
truth = val.Len() > 0
case reflect.Bool:
truth = val.Bool()
case reflect.Complex64, reflect.Complex128:
truth = val.Complex() != 0
case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
truth = !val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
truth = val.Int() != 0
case reflect.Float32, reflect.Float64:
truth = val.Float() != 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
truth = val.Uint() != 0
case reflect.Struct:
truth = true // Struct values are always true.
default:
return
}
return truth, true
}
func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) {
s.at(r)
defer s.pop(s.mark())
val, _ := indirect(s.evalPipeline(dot, r.Pipe))
// mark top of stack before any variables in the body are pushed.
mark := s.mark()
oneIteration := func(index, elem reflect.Value) {
// Set top var (lexically the second if there are two) to the element.
if len(r.Pipe.Decl) > 0 {
s.setVar(1, elem)
}
// Set next var (lexically the first if there are two) to the index.
if len(r.Pipe.Decl) > 1 {
s.setVar(2, index)
}
s.walk(elem, r.List)
s.pop(mark)
}
switch val.Kind() {
case reflect.Array, reflect.Slice:
if val.Len() == 0 {
break
}
for i := 0; i < val.Len(); i++ {
oneIteration(reflect.ValueOf(i), val.Index(i))
}
return
case reflect.Map:
if val.Len() == 0 {
break
}
for _, key := range sortKeys(val.MapKeys()) {
oneIteration(key, val.MapIndex(key))
}
return
case reflect.Chan:
if val.IsNil() {
break
}
i := 0
for ; ; i++ {
elem, ok := val.Recv()
if !ok {
break
}
oneIteration(reflect.ValueOf(i), elem)
}
if i == 0 {
break
}
return
case reflect.Invalid:
break // An invalid value is likely a nil map, etc. and acts like an empty map.
default:
s.errorf("range can't iterate over %v", val)
}
if r.ElseList != nil {
s.walk(dot, r.ElseList)
}
}
func (s *state) walkTemplate(dot reflect.Value, t *parse.TemplateNode) {
s.at(t)
tmpl := s.tmpl.tmpl[t.Name]
if tmpl == nil {
s.errorf("template %q not defined", t.Name)
}
// Variables declared by the pipeline persist.
dot = s.evalPipeline(dot, t.Pipe)
newState := *s
newState.tmpl = tmpl
// No dynamic scoping: template invocations inherit no variables.
newState.vars = []variable{{"$", dot}}
newState.walk(dot, tmpl.Root)
}
// Eval functions evaluate pipelines, commands, and their elements and extract
// values from the data structure by examining fields, calling methods, and so on.
// The printing of those values happens only through walk functions.
// evalPipeline returns the value acquired by evaluating a pipeline. If the
// pipeline has a variable declaration, the variable will be pushed on the
// stack. Callers should therefore pop the stack after they are finished
// executing commands depending on the pipeline value.
func (s *state) evalPipeline(dot reflect.Value, pipe *parse.PipeNode) (value reflect.Value) {
if pipe == nil {
return
}
s.at(pipe)
for _, cmd := range pipe.Cmds {
value = s.evalCommand(dot, cmd, value) // previous value is this one's final arg.
// If the object has type interface{}, dig down one level to the thing inside.
if value.Kind() == reflect.Interface && value.Type().NumMethod() == 0 {
value = reflect.ValueOf(value.Interface()) // lovely!
}
}
for _, variable := range pipe.Decl {
s.push(variable.Ident[0], value)
}
return value
}
func (s *state) notAFunction(args []parse.Node, final reflect.Value) {
if len(args) > 1 || final.IsValid() {
s.errorf("can't give argument to non-function %s", args[0])
}
}
func (s *state) evalCommand(dot reflect.Value, cmd *parse.CommandNode, final reflect.Value) reflect.Value {
firstWord := cmd.Args[0]
switch n := firstWord.(type) {
case *parse.FieldNode:
return s.evalFieldNode(dot, n, cmd.Args, final)
case *parse.ChainNode:
return s.evalChainNode(dot, n, cmd.Args, final)
case *parse.IdentifierNode:
// Must be a function.
return s.evalFunction(dot, n, cmd, cmd.Args, final)
case *parse.PipeNode:
// Parenthesized pipeline. The arguments are all inside the pipeline; final is ignored.
return s.evalPipeline(dot, n)
case *parse.VariableNode:
return s.evalVariableNode(dot, n, cmd.Args, final)
}
s.at(firstWord)
s.notAFunction(cmd.Args, final)
switch word := firstWord.(type) {
case *parse.BoolNode:
return reflect.ValueOf(word.True)
case *parse.DotNode:
return dot
case *parse.NilNode:
s.errorf("nil is not a command")
case *parse.NumberNode:
return s.idealConstant(word)
case *parse.StringNode:
return reflect.ValueOf(word.Text)
}
s.errorf("can't evaluate command %q", firstWord)
panic("not reached")
}
// idealConstant is called to return the value of a number in a context where
// we don't know the type. In that case, the syntax of the number tells us
// its type, and we use Go rules to resolve. Note there is no such thing as
// a uint ideal constant in this situation - the value must be of int type.
func (s *state) idealConstant(constant *parse.NumberNode) reflect.Value {
// These are ideal constants but we don't know the type
// and we have no context. (If it was a method argument,
// we'd know what we need.) The syntax guides us to some extent.
s.at(constant)
switch {
case constant.IsComplex:
return reflect.ValueOf(constant.Complex128) // incontrovertible.
case constant.IsFloat && !isHexConstant(constant.Text) && strings.IndexAny(constant.Text, ".eE") >= 0:
return reflect.ValueOf(constant.Float64)
case constant.IsInt:
n := int(constant.Int64)
if int64(n) != constant.Int64 {
s.errorf("%s overflows int", constant.Text)
}
return reflect.ValueOf(n)
case constant.IsUint:
s.errorf("%s overflows int", constant.Text)
}
return zero
}
func isHexConstant(s string) bool {
return len(s) > 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X')
}
func (s *state) evalFieldNode(dot reflect.Value, field *parse.FieldNode, args []parse.Node, final reflect.Value) reflect.Value {
s.at(field)
return s.evalFieldChain(dot, dot, field, field.Ident, args, final)
}
func (s *state) evalChainNode(dot reflect.Value, chain *parse.ChainNode, args []parse.Node, final reflect.Value) reflect.Value {
s.at(chain)
// (pipe).Field1.Field2 has pipe as .Node, fields as .Field. Eval the pipeline, then the fields.
pipe := s.evalArg(dot, nil, chain.Node)
if len(chain.Field) == 0 {
s.errorf("internal error: no fields in evalChainNode")
}
return s.evalFieldChain(dot, pipe, chain, chain.Field, args, final)
}
func (s *state) evalVariableNode(dot reflect.Value, variable *parse.VariableNode, args []parse.Node, final reflect.Value) reflect.Value {
// $x.Field has $x as the first ident, Field as the second. Eval the var, then the fields.
s.at(variable)
value := s.varValue(variable.Ident[0])
if len(variable.Ident) == 1 {
s.notAFunction(args, final)
return value
}
return s.evalFieldChain(dot, value, variable, variable.Ident[1:], args, final)
}
// evalFieldChain evaluates .X.Y.Z possibly followed by arguments.
// dot is the environment in which to evaluate arguments, while
// receiver is the value being walked along the chain.
func (s *state) evalFieldChain(dot, receiver reflect.Value, node parse.Node, ident []string, args []parse.Node, final reflect.Value) reflect.Value {
n := len(ident)
for i := 0; i < n-1; i++ {
receiver = s.evalField(dot, ident[i], node, nil, zero, receiver)
}
// Now if it's a method, it gets the arguments.
return s.evalField(dot, ident[n-1], node, args, final, receiver)
}
func (s *state) evalFunction(dot reflect.Value, node *parse.IdentifierNode, cmd parse.Node, args []parse.Node, final reflect.Value) reflect.Value {
s.at(node)
name := node.Ident
function, ok := findFunction(name, s.tmpl)
if !ok {
s.errorf("%q is not a defined function", name)
}
return s.evalCall(dot, function, cmd, name, args, final)
}
// evalField evaluates an expression like (.Field) or (.Field arg1 arg2).
// The 'final' argument represents the return value from the preceding
// value of the pipeline, if any.
func (s *state) evalField(dot reflect.Value, fieldName string, node parse.Node, args []parse.Node, final, receiver reflect.Value) reflect.Value {
if !receiver.IsValid() {
return zero
}
typ := receiver.Type()
receiver, _ = indirect(receiver)
// Unless it's an interface, need to get to a value of type *T to guarantee
// we see all methods of T and *T.
ptr := receiver
if ptr.Kind() != reflect.Interface && ptr.CanAddr() {
ptr = ptr.Addr()
}
if method := ptr.MethodByName(fieldName); method.IsValid() {
return s.evalCall(dot, method, node, fieldName, args, final)
}
hasArgs := len(args) > 1 || final.IsValid()
// It's not a method; must be a field of a struct or an element of a map. The receiver must not be nil.
receiver, isNil := indirect(receiver)
if isNil {
s.errorf("nil pointer evaluating %s.%s", typ, fieldName)
}
switch receiver.Kind() {
case reflect.Struct:
tField, ok := receiver.Type().FieldByName(fieldName)
if ok {
field := receiver.FieldByIndex(tField.Index)
if tField.PkgPath != "" { // field is unexported
s.errorf("%s is an unexported field of struct type %s", fieldName, typ)
}
// If it's a function, we must call it.
if hasArgs {
s.errorf("%s has arguments but cannot be invoked as function", fieldName)
}
return field
}
s.errorf("%s is not a field of struct type %s", fieldName, typ)
case reflect.Map:
// If it's a map, attempt to use the field name as a key.
nameVal := reflect.ValueOf(fieldName)
if nameVal.Type().AssignableTo(receiver.Type().Key()) {
if hasArgs {
s.errorf("%s is not a method but has arguments", fieldName)
}
return receiver.MapIndex(nameVal)
}
}
s.errorf("can't evaluate field %s in type %s", fieldName, typ)
panic("not reached")
}
var (
errorType = reflect.TypeOf((*error)(nil)).Elem()
fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
)
// evalCall executes a function or method call. If it's a method, fun already has the receiver bound, so
// it looks just like a function call. The arg list, if non-nil, includes (in the manner of the shell), arg[0]
// as the function itself.
func (s *state) evalCall(dot, fun reflect.Value, node parse.Node, name string, args []parse.Node, final reflect.Value) reflect.Value {
if args != nil {
args = args[1:] // Zeroth arg is function name/node; not passed to function.
}
typ := fun.Type()
numIn := len(args)
if final.IsValid() {
numIn++
}
numFixed := len(args)
if typ.IsVariadic() {
numFixed = typ.NumIn() - 1 // last arg is the variadic one.
if numIn < numFixed {
s.errorf("wrong number of args for %s: want at least %d got %d", name, typ.NumIn()-1, len(args))
}
} else if numIn < typ.NumIn()-1 || !typ.IsVariadic() && numIn != typ.NumIn() {
s.errorf("wrong number of args for %s: want %d got %d", name, typ.NumIn(), len(args))
}
if !goodFunc(typ) {
// TODO: This could still be a confusing error; maybe goodFunc should provide info.
s.errorf("can't call method/function %q with %d results", name, typ.NumOut())
}
// Build the arg list.
argv := make([]reflect.Value, numIn)
// Args must be evaluated. Fixed args first.
i := 0
for ; i < numFixed && i < len(args); i++ {
argv[i] = s.evalArg(dot, typ.In(i), args[i])
}
// Now the ... args.
if typ.IsVariadic() {
argType := typ.In(typ.NumIn() - 1).Elem() // Argument is a slice.
for ; i < len(args); i++ {
argv[i] = s.evalArg(dot, argType, args[i])
}
}
// Add final value if necessary.
if final.IsValid() {
t := typ.In(typ.NumIn() - 1)
if typ.IsVariadic() {
t = t.Elem()
}
argv[i] = s.validateType(final, t)
}
result := fun.Call(argv)
// If we have an error that is not nil, stop execution and return that error to the caller.
if len(result) == 2 && !result[1].IsNil() {
s.at(node)
s.errorf("error calling %s: %s", name, result[1].Interface().(error))
}
return result[0]
}
// canBeNil reports whether an untyped nil can be assigned to the type. See reflect.Zero.
func canBeNil(typ reflect.Type) bool {
switch typ.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
return true
}
return false
}
// validateType guarantees that the value is valid and assignable to the type.
func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Value {
if !value.IsValid() {
if typ == nil || canBeNil(typ) {
// An untyped nil interface{}. Accept as a proper nil value.
return reflect.Zero(typ)
}
s.errorf("invalid value; expected %s", typ)
}
if typ != nil && !value.Type().AssignableTo(typ) {
if value.Kind() == reflect.Interface && !value.IsNil() {
value = value.Elem()
if value.Type().AssignableTo(typ) {
return value
}
// fallthrough
}
// Does one dereference or indirection work? We could do more, as we
// do with method receivers, but that gets messy and method receivers
// are much more constrained, so it makes more sense there than here.
// Besides, one is almost always all you need.
switch {
case value.Kind() == reflect.Ptr && value.Type().Elem().AssignableTo(typ):
value = value.Elem()
if !value.IsValid() {
s.errorf("dereference of nil pointer of type %s", typ)
}
case reflect.PtrTo(value.Type()).AssignableTo(typ) && value.CanAddr():
value = value.Addr()
default:
s.errorf("wrong type for value; expected %s; got %s", typ, value.Type())
}
}
return value
}
func (s *state) evalArg(dot reflect.Value, typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
switch arg := n.(type) {
case *parse.DotNode:
return s.validateType(dot, typ)
case *parse.NilNode:
if canBeNil(typ) {
return reflect.Zero(typ)
}
s.errorf("cannot assign nil to %s", typ)
case *parse.FieldNode:
return s.validateType(s.evalFieldNode(dot, arg, []parse.Node{n}, zero), typ)
case *parse.VariableNode:
return s.validateType(s.evalVariableNode(dot, arg, nil, zero), typ)
case *parse.PipeNode:
return s.validateType(s.evalPipeline(dot, arg), typ)
case *parse.IdentifierNode:
return s.evalFunction(dot, arg, arg, nil, zero)
case *parse.ChainNode:
return s.validateType(s.evalChainNode(dot, arg, nil, zero), typ)
}
switch typ.Kind() {
case reflect.Bool:
return s.evalBool(typ, n)
case reflect.Complex64, reflect.Complex128:
return s.evalComplex(typ, n)
case reflect.Float32, reflect.Float64:
return s.evalFloat(typ, n)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return s.evalInteger(typ, n)
case reflect.Interface:
if typ.NumMethod() == 0 {
return s.evalEmptyInterface(dot, n)
}
case reflect.String:
return s.evalString(typ, n)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return s.evalUnsignedInteger(typ, n)
}
s.errorf("can't handle %s for arg of type %s", n, typ)
panic("not reached")
}
func (s *state) evalBool(typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
if n, ok := n.(*parse.BoolNode); ok {
value := reflect.New(typ).Elem()
value.SetBool(n.True)
return value
}
s.errorf("expected bool; found %s", n)
panic("not reached")
}
func (s *state) evalString(typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
if n, ok := n.(*parse.StringNode); ok {
value := reflect.New(typ).Elem()
value.SetString(n.Text)
return value
}
s.errorf("expected string; found %s", n)
panic("not reached")
}
func (s *state) evalInteger(typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
if n, ok := n.(*parse.NumberNode); ok && n.IsInt {
value := reflect.New(typ).Elem()
value.SetInt(n.Int64)
return value
}
s.errorf("expected integer; found %s", n)
panic("not reached")
}
func (s *state) evalUnsignedInteger(typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
if n, ok := n.(*parse.NumberNode); ok && n.IsUint {
value := reflect.New(typ).Elem()
value.SetUint(n.Uint64)
return value
}
s.errorf("expected unsigned integer; found %s", n)
panic("not reached")
}
func (s *state) evalFloat(typ reflect.Type, n parse.Node) reflect.Value {
s.at(n)
if n, ok := n.(*parse.NumberNode); ok && n.IsFloat {
value := reflect.New(typ).Elem()
value.SetFloat(n.Float64)
return value
}
s.errorf("expected float; found %s", n)
panic("not reached")
}
func (s *state) evalComplex(typ reflect.Type, n parse.Node) reflect.Value {
if n, ok := n.(*parse.NumberNode); ok && n.IsComplex {
value := reflect.New(typ).Elem()
value.SetComplex(n.Complex128)
return value
}
s.errorf("expected complex; found %s", n)
panic("not reached")
}
func (s *state) evalEmptyInterface(dot reflect.Value, n parse.Node) reflect.Value {
s.at(n)
switch n := n.(type) {
case *parse.BoolNode:
return reflect.ValueOf(n.True)
case *parse.DotNode:
return dot
case *parse.FieldNode:
return s.evalFieldNode(dot, n, nil, zero)
case *parse.IdentifierNode:
return s.evalFunction(dot, n, n, nil, zero)
case *parse.NilNode:
// NilNode is handled in evalArg, the only place that calls here.
s.errorf("evalEmptyInterface: nil (can't happen)")
case *parse.NumberNode:
return s.idealConstant(n)
case *parse.StringNode:
return reflect.ValueOf(n.Text)
case *parse.VariableNode:
return s.evalVariableNode(dot, n, nil, zero)
case *parse.PipeNode:
return s.evalPipeline(dot, n)
}
s.errorf("can't handle assignment of %s to empty interface argument", n)
panic("not reached")
}
// indirect returns the item at the end of indirection, and a bool to indicate if it's nil.
// We indirect through pointers and empty interfaces (only) because
// non-empty interfaces have methods we might need.
func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
if v.IsNil() {
return v, true
}
if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
break
}
}
return v, false
}
// printValue writes the textual representation of the value to the output of
// the template.
func (s *state) printValue(n parse.Node, v reflect.Value) {
s.at(n)
iface, ok := printableValue(v)
if !ok {
s.errorf("can't print %s of type %s", n, v.Type())
}
fmt.Fprint(s.wr, iface)
}
// printableValue returns the, possibly indirected, interface value inside v that
// is best for a call to formatted printer.
func printableValue(v reflect.Value) (interface{}, bool) {
if v.Kind() == reflect.Ptr {
v, _ = indirect(v) // fmt.Fprint handles nil.
}
if !v.IsValid() {
return "<no value>", true
}
if !v.Type().Implements(errorType) && !v.Type().Implements(fmtStringerType) {
if v.CanAddr() && (reflect.PtrTo(v.Type()).Implements(errorType) || reflect.PtrTo(v.Type()).Implements(fmtStringerType)) {
v = v.Addr()
} else {
switch v.Kind() {
case reflect.Chan, reflect.Func:
return nil, false
}
}
}
return v.Interface(), true
}
// Types to help sort the keys in a map for reproducible output.
type rvs []reflect.Value
func (x rvs) Len() int { return len(x) }
func (x rvs) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
type rvInts struct{ rvs }
func (x rvInts) Less(i, j int) bool { return x.rvs[i].Int() < x.rvs[j].Int() }
type rvUints struct{ rvs }
func (x rvUints) Less(i, j int) bool { return x.rvs[i].Uint() < x.rvs[j].Uint() }
type rvFloats struct{ rvs }
func (x rvFloats) Less(i, j int) bool { return x.rvs[i].Float() < x.rvs[j].Float() }
type rvStrings struct{ rvs }
func (x rvStrings) Less(i, j int) bool { return x.rvs[i].String() < x.rvs[j].String() }
// sortKeys sorts (if it can) the slice of reflect.Values, which is a slice of map keys.
func sortKeys(v []reflect.Value) []reflect.Value {
if len(v) <= 1 {
return v
}
switch v[0].Kind() {
case reflect.Float32, reflect.Float64:
sort.Sort(rvFloats{v})
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
sort.Sort(rvInts{v})
case reflect.String:
sort.Sort(rvStrings{v})
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
sort.Sort(rvUints{v})
}
return v
}

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"bytes"
"errors"
"fmt"
"io"
"net/url"
"reflect"
"strings"
"unicode"
"unicode/utf8"
)
// FuncMap is the type of the map defining the mapping from names to functions.
// Each function must have either a single return value, or two return values of
// which the second has type error. In that case, if the second (error)
// return value evaluates to non-nil during execution, execution terminates and
// Execute returns that error.
type FuncMap map[string]interface{}
var builtins = FuncMap{
"and": and,
"call": call,
"html": HTMLEscaper,
"index": index,
"js": JSEscaper,
"len": length,
"not": not,
"or": or,
"print": fmt.Sprint,
"printf": fmt.Sprintf,
"println": fmt.Sprintln,
"urlquery": URLQueryEscaper,
// Comparisons
"eq": eq, // ==
"ge": ge, // >=
"gt": gt, // >
"le": le, // <=
"lt": lt, // <
"ne": ne, // !=
}
var builtinFuncs = createValueFuncs(builtins)
// createValueFuncs turns a FuncMap into a map[string]reflect.Value
func createValueFuncs(funcMap FuncMap) map[string]reflect.Value {
m := make(map[string]reflect.Value)
addValueFuncs(m, funcMap)
return m
}
// addValueFuncs adds to values the functions in funcs, converting them to reflect.Values.
func addValueFuncs(out map[string]reflect.Value, in FuncMap) {
for name, fn := range in {
v := reflect.ValueOf(fn)
if v.Kind() != reflect.Func {
panic("value for " + name + " not a function")
}
if !goodFunc(v.Type()) {
panic(fmt.Errorf("can't install method/function %q with %d results", name, v.Type().NumOut()))
}
out[name] = v
}
}
// addFuncs adds to values the functions in funcs. It does no checking of the input -
// call addValueFuncs first.
func addFuncs(out, in FuncMap) {
for name, fn := range in {
out[name] = fn
}
}
// goodFunc checks that the function or method has the right result signature.
func goodFunc(typ reflect.Type) bool {
// We allow functions with 1 result or 2 results where the second is an error.
switch {
case typ.NumOut() == 1:
return true
case typ.NumOut() == 2 && typ.Out(1) == errorType:
return true
}
return false
}
// findFunction looks for a function in the template, and global map.
func findFunction(name string, tmpl *Template) (reflect.Value, bool) {
if tmpl != nil && tmpl.common != nil {
if fn := tmpl.execFuncs[name]; fn.IsValid() {
return fn, true
}
}
if fn := builtinFuncs[name]; fn.IsValid() {
return fn, true
}
return reflect.Value{}, false
}
// Indexing.
// index returns the result of indexing its first argument by the following
// arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each
// indexed item must be a map, slice, or array.
func index(item interface{}, indices ...interface{}) (interface{}, error) {
v := reflect.ValueOf(item)
for _, i := range indices {
index := reflect.ValueOf(i)
var isNil bool
if v, isNil = indirect(v); isNil {
return nil, fmt.Errorf("index of nil pointer")
}
switch v.Kind() {
case reflect.Array, reflect.Slice, reflect.String:
var x int64
switch index.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
x = index.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
x = int64(index.Uint())
default:
return nil, fmt.Errorf("cannot index slice/array with type %s", index.Type())
}
if x < 0 || x >= int64(v.Len()) {
return nil, fmt.Errorf("index out of range: %d", x)
}
v = v.Index(int(x))
case reflect.Map:
if !index.IsValid() {
index = reflect.Zero(v.Type().Key())
}
if !index.Type().AssignableTo(v.Type().Key()) {
return nil, fmt.Errorf("%s is not index type for %s", index.Type(), v.Type())
}
if x := v.MapIndex(index); x.IsValid() {
v = x
} else {
v = reflect.Zero(v.Type().Elem())
}
default:
return nil, fmt.Errorf("can't index item of type %s", v.Type())
}
}
return v.Interface(), nil
}
// Length
// length returns the length of the item, with an error if it has no defined length.
func length(item interface{}) (int, error) {
v, isNil := indirect(reflect.ValueOf(item))
if isNil {
return 0, fmt.Errorf("len of nil pointer")
}
switch v.Kind() {
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
return v.Len(), nil
}
return 0, fmt.Errorf("len of type %s", v.Type())
}
// Function invocation
// call returns the result of evaluating the first argument as a function.
// The function must return 1 result, or 2 results, the second of which is an error.
func call(fn interface{}, args ...interface{}) (interface{}, error) {
v := reflect.ValueOf(fn)
typ := v.Type()
if typ.Kind() != reflect.Func {
return nil, fmt.Errorf("non-function of type %s", typ)
}
if !goodFunc(typ) {
return nil, fmt.Errorf("function called with %d args; should be 1 or 2", typ.NumOut())
}
numIn := typ.NumIn()
var dddType reflect.Type
if typ.IsVariadic() {
if len(args) < numIn-1 {
return nil, fmt.Errorf("wrong number of args: got %d want at least %d", len(args), numIn-1)
}
dddType = typ.In(numIn - 1).Elem()
} else {
if len(args) != numIn {
return nil, fmt.Errorf("wrong number of args: got %d want %d", len(args), numIn)
}
}
argv := make([]reflect.Value, len(args))
for i, arg := range args {
value := reflect.ValueOf(arg)
// Compute the expected type. Clumsy because of variadics.
var argType reflect.Type
if !typ.IsVariadic() || i < numIn-1 {
argType = typ.In(i)
} else {
argType = dddType
}
if !value.IsValid() && canBeNil(argType) {
value = reflect.Zero(argType)
}
if !value.Type().AssignableTo(argType) {
return nil, fmt.Errorf("arg %d has type %s; should be %s", i, value.Type(), argType)
}
argv[i] = value
}
result := v.Call(argv)
if len(result) == 2 && !result[1].IsNil() {
return result[0].Interface(), result[1].Interface().(error)
}
return result[0].Interface(), nil
}
// Boolean logic.
func truth(a interface{}) bool {
t, _ := isTrue(reflect.ValueOf(a))
return t
}
// and computes the Boolean AND of its arguments, returning
// the first false argument it encounters, or the last argument.
func and(arg0 interface{}, args ...interface{}) interface{} {
if !truth(arg0) {
return arg0
}
for i := range args {
arg0 = args[i]
if !truth(arg0) {
break
}
}
return arg0
}
// or computes the Boolean OR of its arguments, returning
// the first true argument it encounters, or the last argument.
func or(arg0 interface{}, args ...interface{}) interface{} {
if truth(arg0) {
return arg0
}
for i := range args {
arg0 = args[i]
if truth(arg0) {
break
}
}
return arg0
}
// not returns the Boolean negation of its argument.
func not(arg interface{}) (truth bool) {
truth, _ = isTrue(reflect.ValueOf(arg))
return !truth
}
// Comparison.
// TODO: Perhaps allow comparison between signed and unsigned integers.
var (
errBadComparisonType = errors.New("invalid type for comparison")
errBadComparison = errors.New("incompatible types for comparison")
errNoComparison = errors.New("missing argument for comparison")
)
type kind int
const (
invalidKind kind = iota
boolKind
complexKind
intKind
floatKind
integerKind
stringKind
uintKind
)
func basicKind(v reflect.Value) (kind, error) {
switch v.Kind() {
case reflect.Bool:
return boolKind, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intKind, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintKind, nil
case reflect.Float32, reflect.Float64:
return floatKind, nil
case reflect.Complex64, reflect.Complex128:
return complexKind, nil
case reflect.String:
return stringKind, nil
}
return invalidKind, errBadComparisonType
}
// eq evaluates the comparison a == b || a == c || ...
func eq(arg1 interface{}, arg2 ...interface{}) (bool, error) {
v1 := reflect.ValueOf(arg1)
k1, err := basicKind(v1)
if err != nil {
return false, err
}
if len(arg2) == 0 {
return false, errNoComparison
}
for _, arg := range arg2 {
v2 := reflect.ValueOf(arg)
k2, err := basicKind(v2)
if err != nil {
return false, err
}
truth := false
if k1 != k2 {
// Special case: Can compare integer values regardless of type's sign.
switch {
case k1 == intKind && k2 == uintKind:
truth = v1.Int() >= 0 && uint64(v1.Int()) == v2.Uint()
case k1 == uintKind && k2 == intKind:
truth = v2.Int() >= 0 && v1.Uint() == uint64(v2.Int())
default:
return false, errBadComparison
}
} else {
switch k1 {
case boolKind:
truth = v1.Bool() == v2.Bool()
case complexKind:
truth = v1.Complex() == v2.Complex()
case floatKind:
truth = v1.Float() == v2.Float()
case intKind:
truth = v1.Int() == v2.Int()
case stringKind:
truth = v1.String() == v2.String()
case uintKind:
truth = v1.Uint() == v2.Uint()
default:
panic("invalid kind")
}
}
if truth {
return true, nil
}
}
return false, nil
}
// ne evaluates the comparison a != b.
func ne(arg1, arg2 interface{}) (bool, error) {
// != is the inverse of ==.
equal, err := eq(arg1, arg2)
return !equal, err
}
// lt evaluates the comparison a < b.
func lt(arg1, arg2 interface{}) (bool, error) {
v1 := reflect.ValueOf(arg1)
k1, err := basicKind(v1)
if err != nil {
return false, err
}
v2 := reflect.ValueOf(arg2)
k2, err := basicKind(v2)
if err != nil {
return false, err
}
truth := false
if k1 != k2 {
// Special case: Can compare integer values regardless of type's sign.
switch {
case k1 == intKind && k2 == uintKind:
truth = v1.Int() < 0 || uint64(v1.Int()) < v2.Uint()
case k1 == uintKind && k2 == intKind:
truth = v2.Int() >= 0 && v1.Uint() < uint64(v2.Int())
default:
return false, errBadComparison
}
} else {
switch k1 {
case boolKind, complexKind:
return false, errBadComparisonType
case floatKind:
truth = v1.Float() < v2.Float()
case intKind:
truth = v1.Int() < v2.Int()
case stringKind:
truth = v1.String() < v2.String()
case uintKind:
truth = v1.Uint() < v2.Uint()
default:
panic("invalid kind")
}
}
return truth, nil
}
// le evaluates the comparison <= b.
func le(arg1, arg2 interface{}) (bool, error) {
// <= is < or ==.
lessThan, err := lt(arg1, arg2)
if lessThan || err != nil {
return lessThan, err
}
return eq(arg1, arg2)
}
// gt evaluates the comparison a > b.
func gt(arg1, arg2 interface{}) (bool, error) {
// > is the inverse of <=.
lessOrEqual, err := le(arg1, arg2)
if err != nil {
return false, err
}
return !lessOrEqual, nil
}
// ge evaluates the comparison a >= b.
func ge(arg1, arg2 interface{}) (bool, error) {
// >= is the inverse of <.
lessThan, err := lt(arg1, arg2)
if err != nil {
return false, err
}
return !lessThan, nil
}
// HTML escaping.
var (
htmlQuot = []byte("&#34;") // shorter than "&quot;"
htmlApos = []byte("&#39;") // shorter than "&apos;" and apos was not in HTML until HTML5
htmlAmp = []byte("&amp;")
htmlLt = []byte("&lt;")
htmlGt = []byte("&gt;")
)
// HTMLEscape writes to w the escaped HTML equivalent of the plain text data b.
func HTMLEscape(w io.Writer, b []byte) {
last := 0
for i, c := range b {
var html []byte
switch c {
case '"':
html = htmlQuot
case '\'':
html = htmlApos
case '&':
html = htmlAmp
case '<':
html = htmlLt
case '>':
html = htmlGt
default:
continue
}
w.Write(b[last:i])
w.Write(html)
last = i + 1
}
w.Write(b[last:])
}
// HTMLEscapeString returns the escaped HTML equivalent of the plain text data s.
func HTMLEscapeString(s string) string {
// Avoid allocation if we can.
if strings.IndexAny(s, `'"&<>`) < 0 {
return s
}
var b bytes.Buffer
HTMLEscape(&b, []byte(s))
return b.String()
}
// HTMLEscaper returns the escaped HTML equivalent of the textual
// representation of its arguments.
func HTMLEscaper(args ...interface{}) string {
return HTMLEscapeString(evalArgs(args))
}
// JavaScript escaping.
var (
jsLowUni = []byte(`\u00`)
hex = []byte("0123456789ABCDEF")
jsBackslash = []byte(`\\`)
jsApos = []byte(`\'`)
jsQuot = []byte(`\"`)
jsLt = []byte(`\x3C`)
jsGt = []byte(`\x3E`)
)
// JSEscape writes to w the escaped JavaScript equivalent of the plain text data b.
func JSEscape(w io.Writer, b []byte) {
last := 0
for i := 0; i < len(b); i++ {
c := b[i]
if !jsIsSpecial(rune(c)) {
// fast path: nothing to do
continue
}
w.Write(b[last:i])
if c < utf8.RuneSelf {
// Quotes, slashes and angle brackets get quoted.
// Control characters get written as \u00XX.
switch c {
case '\\':
w.Write(jsBackslash)
case '\'':
w.Write(jsApos)
case '"':
w.Write(jsQuot)
case '<':
w.Write(jsLt)
case '>':
w.Write(jsGt)
default:
w.Write(jsLowUni)
t, b := c>>4, c&0x0f
w.Write(hex[t : t+1])
w.Write(hex[b : b+1])
}
} else {
// Unicode rune.
r, size := utf8.DecodeRune(b[i:])
if unicode.IsPrint(r) {
w.Write(b[i : i+size])
} else {
fmt.Fprintf(w, "\\u%04X", r)
}
i += size - 1
}
last = i + 1
}
w.Write(b[last:])
}
// JSEscapeString returns the escaped JavaScript equivalent of the plain text data s.
func JSEscapeString(s string) string {
// Avoid allocation if we can.
if strings.IndexFunc(s, jsIsSpecial) < 0 {
return s
}
var b bytes.Buffer
JSEscape(&b, []byte(s))
return b.String()
}
func jsIsSpecial(r rune) bool {
switch r {
case '\\', '\'', '"', '<', '>':
return true
}
return r < ' ' || utf8.RuneSelf <= r
}
// JSEscaper returns the escaped JavaScript equivalent of the textual
// representation of its arguments.
func JSEscaper(args ...interface{}) string {
return JSEscapeString(evalArgs(args))
}
// URLQueryEscaper returns the escaped value of the textual representation of
// its arguments in a form suitable for embedding in a URL query.
func URLQueryEscaper(args ...interface{}) string {
return url.QueryEscape(evalArgs(args))
}
// evalArgs formats the list of arguments into a string. It is therefore equivalent to
// fmt.Sprint(args...)
// except that each argument is indirected (if a pointer), as required,
// using the same rules as the default string evaluation during template
// execution.
func evalArgs(args []interface{}) string {
ok := false
var s string
// Fast path for simple common case.
if len(args) == 1 {
s, ok = args[0].(string)
}
if !ok {
for i, arg := range args {
a, ok := printableValue(reflect.ValueOf(arg))
if ok {
args[i] = a
} // else left fmt do its thing
}
s = fmt.Sprint(args...)
}
return s
}

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Helper functions to make constructing templates easier.
package template
import (
"fmt"
"io/ioutil"
"path/filepath"
)
// Functions and methods to parse templates.
// Must is a helper that wraps a call to a function returning (*Template, error)
// and panics if the error is non-nil. It is intended for use in variable
// initializations such as
// var t = template.Must(template.New("name").Parse("text"))
func Must(t *Template, err error) *Template {
if err != nil {
panic(err)
}
return t
}
// ParseFiles creates a new Template and parses the template definitions from
// the named files. The returned template's name will have the (base) name and
// (parsed) contents of the first file. There must be at least one file.
// If an error occurs, parsing stops and the returned *Template is nil.
func ParseFiles(filenames ...string) (*Template, error) {
return parseFiles(nil, filenames...)
}
// ParseFiles parses the named files and associates the resulting templates with
// t. If an error occurs, parsing stops and the returned template is nil;
// otherwise it is t. There must be at least one file.
func (t *Template) ParseFiles(filenames ...string) (*Template, error) {
return parseFiles(t, filenames...)
}
// parseFiles is the helper for the method and function. If the argument
// template is nil, it is created from the first file.
func parseFiles(t *Template, filenames ...string) (*Template, error) {
if len(filenames) == 0 {
// Not really a problem, but be consistent.
return nil, fmt.Errorf("template: no files named in call to ParseFiles")
}
for _, filename := range filenames {
b, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
s := string(b)
name := filepath.Base(filename)
// First template becomes return value if not already defined,
// and we use that one for subsequent New calls to associate
// all the templates together. Also, if this file has the same name
// as t, this file becomes the contents of t, so
// t, err := New(name).Funcs(xxx).ParseFiles(name)
// works. Otherwise we create a new template associated with t.
var tmpl *Template
if t == nil {
t = New(name)
}
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
_, err = tmpl.Parse(s)
if err != nil {
return nil, err
}
}
return t, nil
}
// ParseGlob creates a new Template and parses the template definitions from the
// files identified by the pattern, which must match at least one file. The
// returned template will have the (base) name and (parsed) contents of the
// first file matched by the pattern. ParseGlob is equivalent to calling
// ParseFiles with the list of files matched by the pattern.
func ParseGlob(pattern string) (*Template, error) {
return parseGlob(nil, pattern)
}
// ParseGlob parses the template definitions in the files identified by the
// pattern and associates the resulting templates with t. The pattern is
// processed by filepath.Glob and must match at least one file. ParseGlob is
// equivalent to calling t.ParseFiles with the list of files matched by the
// pattern.
func (t *Template) ParseGlob(pattern string) (*Template, error) {
return parseGlob(t, pattern)
}
// parseGlob is the implementation of the function and method ParseGlob.
func parseGlob(t *Template, pattern string) (*Template, error) {
filenames, err := filepath.Glob(pattern)
if err != nil {
return nil, err
}
if len(filenames) == 0 {
return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern)
}
return parseFiles(t, filenames...)
}

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package parse
import (
"fmt"
"strings"
"unicode"
"unicode/utf8"
)
// item represents a token or text string returned from the scanner.
type item struct {
typ itemType // The type of this item.
pos Pos // The starting position, in bytes, of this item in the input string.
val string // The value of this item.
}
func (i item) String() string {
switch {
case i.typ == itemEOF:
return "EOF"
case i.typ == itemError:
return i.val
case i.typ > itemKeyword:
return fmt.Sprintf("<%s>", i.val)
case len(i.val) > 10:
return fmt.Sprintf("%.10q...", i.val)
}
return fmt.Sprintf("%q", i.val)
}
// itemType identifies the type of lex items.
type itemType int
const (
itemError itemType = iota // error occurred; value is text of error
itemBool // boolean constant
itemChar // printable ASCII character; grab bag for comma etc.
itemCharConstant // character constant
itemComplex // complex constant (1+2i); imaginary is just a number
itemColonEquals // colon-equals (':=') introducing a declaration
itemEOF
itemField // alphanumeric identifier starting with '.'
itemIdentifier // alphanumeric identifier not starting with '.'
itemLeftDelim // left action delimiter
itemLeftParen // '(' inside action
itemNumber // simple number, including imaginary
itemPipe // pipe symbol
itemRawString // raw quoted string (includes quotes)
itemRightDelim // right action delimiter
itemElideNewline // elide newline after right delim
itemRightParen // ')' inside action
itemSpace // run of spaces separating arguments
itemString // quoted string (includes quotes)
itemText // plain text
itemVariable // variable starting with '$', such as '$' or '$1' or '$hello'
// Keywords appear after all the rest.
itemKeyword // used only to delimit the keywords
itemDot // the cursor, spelled '.'
itemDefine // define keyword
itemElse // else keyword
itemEnd // end keyword
itemIf // if keyword
itemNil // the untyped nil constant, easiest to treat as a keyword
itemRange // range keyword
itemTemplate // template keyword
itemWith // with keyword
)
var key = map[string]itemType{
".": itemDot,
"define": itemDefine,
"else": itemElse,
"end": itemEnd,
"if": itemIf,
"range": itemRange,
"nil": itemNil,
"template": itemTemplate,
"with": itemWith,
}
const eof = -1
// stateFn represents the state of the scanner as a function that returns the next state.
type stateFn func(*lexer) stateFn
// lexer holds the state of the scanner.
type lexer struct {
name string // the name of the input; used only for error reports
input string // the string being scanned
leftDelim string // start of action
rightDelim string // end of action
state stateFn // the next lexing function to enter
pos Pos // current position in the input
start Pos // start position of this item
width Pos // width of last rune read from input
lastPos Pos // position of most recent item returned by nextItem
items chan item // channel of scanned items
parenDepth int // nesting depth of ( ) exprs
}
// next returns the next rune in the input.
func (l *lexer) next() rune {
if int(l.pos) >= len(l.input) {
l.width = 0
return eof
}
r, w := utf8.DecodeRuneInString(l.input[l.pos:])
l.width = Pos(w)
l.pos += l.width
return r
}
// peek returns but does not consume the next rune in the input.
func (l *lexer) peek() rune {
r := l.next()
l.backup()
return r
}
// backup steps back one rune. Can only be called once per call of next.
func (l *lexer) backup() {
l.pos -= l.width
}
// emit passes an item back to the client.
func (l *lexer) emit(t itemType) {
l.items <- item{t, l.start, l.input[l.start:l.pos]}
l.start = l.pos
}
// ignore skips over the pending input before this point.
func (l *lexer) ignore() {
l.start = l.pos
}
// accept consumes the next rune if it's from the valid set.
func (l *lexer) accept(valid string) bool {
if strings.IndexRune(valid, l.next()) >= 0 {
return true
}
l.backup()
return false
}
// acceptRun consumes a run of runes from the valid set.
func (l *lexer) acceptRun(valid string) {
for strings.IndexRune(valid, l.next()) >= 0 {
}
l.backup()
}
// lineNumber reports which line we're on, based on the position of
// the previous item returned by nextItem. Doing it this way
// means we don't have to worry about peek double counting.
func (l *lexer) lineNumber() int {
return 1 + strings.Count(l.input[:l.lastPos], "\n")
}
// errorf returns an error token and terminates the scan by passing
// back a nil pointer that will be the next state, terminating l.nextItem.
func (l *lexer) errorf(format string, args ...interface{}) stateFn {
l.items <- item{itemError, l.start, fmt.Sprintf(format, args...)}
return nil
}
// nextItem returns the next item from the input.
func (l *lexer) nextItem() item {
item := <-l.items
l.lastPos = item.pos
return item
}
// lex creates a new scanner for the input string.
func lex(name, input, left, right string) *lexer {
if left == "" {
left = leftDelim
}
if right == "" {
right = rightDelim
}
l := &lexer{
name: name,
input: input,
leftDelim: left,
rightDelim: right,
items: make(chan item),
}
go l.run()
return l
}
// run runs the state machine for the lexer.
func (l *lexer) run() {
for l.state = lexText; l.state != nil; {
l.state = l.state(l)
}
}
// state functions
const (
leftDelim = "{{"
rightDelim = "}}"
leftComment = "/*"
rightComment = "*/"
)
// lexText scans until an opening action delimiter, "{{".
func lexText(l *lexer) stateFn {
for {
if strings.HasPrefix(l.input[l.pos:], l.leftDelim) {
if l.pos > l.start {
l.emit(itemText)
}
return lexLeftDelim
}
if l.next() == eof {
break
}
}
// Correctly reached EOF.
if l.pos > l.start {
l.emit(itemText)
}
l.emit(itemEOF)
return nil
}
// lexLeftDelim scans the left delimiter, which is known to be present.
func lexLeftDelim(l *lexer) stateFn {
l.pos += Pos(len(l.leftDelim))
if strings.HasPrefix(l.input[l.pos:], leftComment) {
return lexComment
}
l.emit(itemLeftDelim)
l.parenDepth = 0
return lexInsideAction
}
// lexComment scans a comment. The left comment marker is known to be present.
func lexComment(l *lexer) stateFn {
l.pos += Pos(len(leftComment))
i := strings.Index(l.input[l.pos:], rightComment)
if i < 0 {
return l.errorf("unclosed comment")
}
l.pos += Pos(i + len(rightComment))
if !strings.HasPrefix(l.input[l.pos:], l.rightDelim) {
return l.errorf("comment ends before closing delimiter")
}
l.pos += Pos(len(l.rightDelim))
l.ignore()
return lexText
}
// lexRightDelim scans the right delimiter, which is known to be present.
func lexRightDelim(l *lexer) stateFn {
l.pos += Pos(len(l.rightDelim))
l.emit(itemRightDelim)
if l.peek() == '\\' {
l.pos++
l.emit(itemElideNewline)
}
return lexText
}
// lexInsideAction scans the elements inside action delimiters.
func lexInsideAction(l *lexer) stateFn {
// Either number, quoted string, or identifier.
// Spaces separate arguments; runs of spaces turn into itemSpace.
// Pipe symbols separate and are emitted.
if strings.HasPrefix(l.input[l.pos:], l.rightDelim+"\\") || strings.HasPrefix(l.input[l.pos:], l.rightDelim) {
if l.parenDepth == 0 {
return lexRightDelim
}
return l.errorf("unclosed left paren")
}
switch r := l.next(); {
case r == eof || isEndOfLine(r):
return l.errorf("unclosed action")
case isSpace(r):
return lexSpace
case r == ':':
if l.next() != '=' {
return l.errorf("expected :=")
}
l.emit(itemColonEquals)
case r == '|':
l.emit(itemPipe)
case r == '"':
return lexQuote
case r == '`':
return lexRawQuote
case r == '$':
return lexVariable
case r == '\'':
return lexChar
case r == '.':
// special look-ahead for ".field" so we don't break l.backup().
if l.pos < Pos(len(l.input)) {
r := l.input[l.pos]
if r < '0' || '9' < r {
return lexField
}
}
fallthrough // '.' can start a number.
case r == '+' || r == '-' || ('0' <= r && r <= '9'):
l.backup()
return lexNumber
case isAlphaNumeric(r):
l.backup()
return lexIdentifier
case r == '(':
l.emit(itemLeftParen)
l.parenDepth++
return lexInsideAction
case r == ')':
l.emit(itemRightParen)
l.parenDepth--
if l.parenDepth < 0 {
return l.errorf("unexpected right paren %#U", r)
}
return lexInsideAction
case r <= unicode.MaxASCII && unicode.IsPrint(r):
l.emit(itemChar)
return lexInsideAction
default:
return l.errorf("unrecognized character in action: %#U", r)
}
return lexInsideAction
}
// lexSpace scans a run of space characters.
// One space has already been seen.
func lexSpace(l *lexer) stateFn {
for isSpace(l.peek()) {
l.next()
}
l.emit(itemSpace)
return lexInsideAction
}
// lexIdentifier scans an alphanumeric.
func lexIdentifier(l *lexer) stateFn {
Loop:
for {
switch r := l.next(); {
case isAlphaNumeric(r):
// absorb.
default:
l.backup()
word := l.input[l.start:l.pos]
if !l.atTerminator() {
return l.errorf("bad character %#U", r)
}
switch {
case key[word] > itemKeyword:
l.emit(key[word])
case word[0] == '.':
l.emit(itemField)
case word == "true", word == "false":
l.emit(itemBool)
default:
l.emit(itemIdentifier)
}
break Loop
}
}
return lexInsideAction
}
// lexField scans a field: .Alphanumeric.
// The . has been scanned.
func lexField(l *lexer) stateFn {
return lexFieldOrVariable(l, itemField)
}
// lexVariable scans a Variable: $Alphanumeric.
// The $ has been scanned.
func lexVariable(l *lexer) stateFn {
if l.atTerminator() { // Nothing interesting follows -> "$".
l.emit(itemVariable)
return lexInsideAction
}
return lexFieldOrVariable(l, itemVariable)
}
// lexVariable scans a field or variable: [.$]Alphanumeric.
// The . or $ has been scanned.
func lexFieldOrVariable(l *lexer, typ itemType) stateFn {
if l.atTerminator() { // Nothing interesting follows -> "." or "$".
if typ == itemVariable {
l.emit(itemVariable)
} else {
l.emit(itemDot)
}
return lexInsideAction
}
var r rune
for {
r = l.next()
if !isAlphaNumeric(r) {
l.backup()
break
}
}
if !l.atTerminator() {
return l.errorf("bad character %#U", r)
}
l.emit(typ)
return lexInsideAction
}
// atTerminator reports whether the input is at valid termination character to
// appear after an identifier. Breaks .X.Y into two pieces. Also catches cases
// like "$x+2" not being acceptable without a space, in case we decide one
// day to implement arithmetic.
func (l *lexer) atTerminator() bool {
r := l.peek()
if isSpace(r) || isEndOfLine(r) {
return true
}
switch r {
case eof, '.', ',', '|', ':', ')', '(':
return true
}
// Does r start the delimiter? This can be ambiguous (with delim=="//", $x/2 will
// succeed but should fail) but only in extremely rare cases caused by willfully
// bad choice of delimiter.
if rd, _ := utf8.DecodeRuneInString(l.rightDelim); rd == r {
return true
}
return false
}
// lexChar scans a character constant. The initial quote is already
// scanned. Syntax checking is done by the parser.
func lexChar(l *lexer) stateFn {
Loop:
for {
switch l.next() {
case '\\':
if r := l.next(); r != eof && r != '\n' {
break
}
fallthrough
case eof, '\n':
return l.errorf("unterminated character constant")
case '\'':
break Loop
}
}
l.emit(itemCharConstant)
return lexInsideAction
}
// lexNumber scans a number: decimal, octal, hex, float, or imaginary. This
// isn't a perfect number scanner - for instance it accepts "." and "0x0.2"
// and "089" - but when it's wrong the input is invalid and the parser (via
// strconv) will notice.
func lexNumber(l *lexer) stateFn {
if !l.scanNumber() {
return l.errorf("bad number syntax: %q", l.input[l.start:l.pos])
}
if sign := l.peek(); sign == '+' || sign == '-' {
// Complex: 1+2i. No spaces, must end in 'i'.
if !l.scanNumber() || l.input[l.pos-1] != 'i' {
return l.errorf("bad number syntax: %q", l.input[l.start:l.pos])
}
l.emit(itemComplex)
} else {
l.emit(itemNumber)
}
return lexInsideAction
}
func (l *lexer) scanNumber() bool {
// Optional leading sign.
l.accept("+-")
// Is it hex?
digits := "0123456789"
if l.accept("0") && l.accept("xX") {
digits = "0123456789abcdefABCDEF"
}
l.acceptRun(digits)
if l.accept(".") {
l.acceptRun(digits)
}
if l.accept("eE") {
l.accept("+-")
l.acceptRun("0123456789")
}
// Is it imaginary?
l.accept("i")
// Next thing mustn't be alphanumeric.
if isAlphaNumeric(l.peek()) {
l.next()
return false
}
return true
}
// lexQuote scans a quoted string.
func lexQuote(l *lexer) stateFn {
Loop:
for {
switch l.next() {
case '\\':
if r := l.next(); r != eof && r != '\n' {
break
}
fallthrough
case eof, '\n':
return l.errorf("unterminated quoted string")
case '"':
break Loop
}
}
l.emit(itemString)
return lexInsideAction
}
// lexRawQuote scans a raw quoted string.
func lexRawQuote(l *lexer) stateFn {
Loop:
for {
switch l.next() {
case eof, '\n':
return l.errorf("unterminated raw quoted string")
case '`':
break Loop
}
}
l.emit(itemRawString)
return lexInsideAction
}
// isSpace reports whether r is a space character.
func isSpace(r rune) bool {
return r == ' ' || r == '\t'
}
// isEndOfLine reports whether r is an end-of-line character.
func isEndOfLine(r rune) bool {
return r == '\r' || r == '\n'
}
// isAlphaNumeric reports whether r is an alphabetic, digit, or underscore.
func isAlphaNumeric(r rune) bool {
return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)
}

834
vendor/github.com/alecthomas/template/parse/node.go generated vendored Normal file
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@ -0,0 +1,834 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Parse nodes.
package parse
import (
"bytes"
"fmt"
"strconv"
"strings"
)
var textFormat = "%s" // Changed to "%q" in tests for better error messages.
// A Node is an element in the parse tree. The interface is trivial.
// The interface contains an unexported method so that only
// types local to this package can satisfy it.
type Node interface {
Type() NodeType
String() string
// Copy does a deep copy of the Node and all its components.
// To avoid type assertions, some XxxNodes also have specialized
// CopyXxx methods that return *XxxNode.
Copy() Node
Position() Pos // byte position of start of node in full original input string
// tree returns the containing *Tree.
// It is unexported so all implementations of Node are in this package.
tree() *Tree
}
// NodeType identifies the type of a parse tree node.
type NodeType int
// Pos represents a byte position in the original input text from which
// this template was parsed.
type Pos int
func (p Pos) Position() Pos {
return p
}
// Type returns itself and provides an easy default implementation
// for embedding in a Node. Embedded in all non-trivial Nodes.
func (t NodeType) Type() NodeType {
return t
}
const (
NodeText NodeType = iota // Plain text.
NodeAction // A non-control action such as a field evaluation.
NodeBool // A boolean constant.
NodeChain // A sequence of field accesses.
NodeCommand // An element of a pipeline.
NodeDot // The cursor, dot.
nodeElse // An else action. Not added to tree.
nodeEnd // An end action. Not added to tree.
NodeField // A field or method name.
NodeIdentifier // An identifier; always a function name.
NodeIf // An if action.
NodeList // A list of Nodes.
NodeNil // An untyped nil constant.
NodeNumber // A numerical constant.
NodePipe // A pipeline of commands.
NodeRange // A range action.
NodeString // A string constant.
NodeTemplate // A template invocation action.
NodeVariable // A $ variable.
NodeWith // A with action.
)
// Nodes.
// ListNode holds a sequence of nodes.
type ListNode struct {
NodeType
Pos
tr *Tree
Nodes []Node // The element nodes in lexical order.
}
func (t *Tree) newList(pos Pos) *ListNode {
return &ListNode{tr: t, NodeType: NodeList, Pos: pos}
}
func (l *ListNode) append(n Node) {
l.Nodes = append(l.Nodes, n)
}
func (l *ListNode) tree() *Tree {
return l.tr
}
func (l *ListNode) String() string {
b := new(bytes.Buffer)
for _, n := range l.Nodes {
fmt.Fprint(b, n)
}
return b.String()
}
func (l *ListNode) CopyList() *ListNode {
if l == nil {
return l
}
n := l.tr.newList(l.Pos)
for _, elem := range l.Nodes {
n.append(elem.Copy())
}
return n
}
func (l *ListNode) Copy() Node {
return l.CopyList()
}
// TextNode holds plain text.
type TextNode struct {
NodeType
Pos
tr *Tree
Text []byte // The text; may span newlines.
}
func (t *Tree) newText(pos Pos, text string) *TextNode {
return &TextNode{tr: t, NodeType: NodeText, Pos: pos, Text: []byte(text)}
}
func (t *TextNode) String() string {
return fmt.Sprintf(textFormat, t.Text)
}
func (t *TextNode) tree() *Tree {
return t.tr
}
func (t *TextNode) Copy() Node {
return &TextNode{tr: t.tr, NodeType: NodeText, Pos: t.Pos, Text: append([]byte{}, t.Text...)}
}
// PipeNode holds a pipeline with optional declaration
type PipeNode struct {
NodeType
Pos
tr *Tree
Line int // The line number in the input (deprecated; kept for compatibility)
Decl []*VariableNode // Variable declarations in lexical order.
Cmds []*CommandNode // The commands in lexical order.
}
func (t *Tree) newPipeline(pos Pos, line int, decl []*VariableNode) *PipeNode {
return &PipeNode{tr: t, NodeType: NodePipe, Pos: pos, Line: line, Decl: decl}
}
func (p *PipeNode) append(command *CommandNode) {
p.Cmds = append(p.Cmds, command)
}
func (p *PipeNode) String() string {
s := ""
if len(p.Decl) > 0 {
for i, v := range p.Decl {
if i > 0 {
s += ", "
}
s += v.String()
}
s += " := "
}
for i, c := range p.Cmds {
if i > 0 {
s += " | "
}
s += c.String()
}
return s
}
func (p *PipeNode) tree() *Tree {
return p.tr
}
func (p *PipeNode) CopyPipe() *PipeNode {
if p == nil {
return p
}
var decl []*VariableNode
for _, d := range p.Decl {
decl = append(decl, d.Copy().(*VariableNode))
}
n := p.tr.newPipeline(p.Pos, p.Line, decl)
for _, c := range p.Cmds {
n.append(c.Copy().(*CommandNode))
}
return n
}
func (p *PipeNode) Copy() Node {
return p.CopyPipe()
}
// ActionNode holds an action (something bounded by delimiters).
// Control actions have their own nodes; ActionNode represents simple
// ones such as field evaluations and parenthesized pipelines.
type ActionNode struct {
NodeType
Pos
tr *Tree
Line int // The line number in the input (deprecated; kept for compatibility)
Pipe *PipeNode // The pipeline in the action.
}
func (t *Tree) newAction(pos Pos, line int, pipe *PipeNode) *ActionNode {
return &ActionNode{tr: t, NodeType: NodeAction, Pos: pos, Line: line, Pipe: pipe}
}
func (a *ActionNode) String() string {
return fmt.Sprintf("{{%s}}", a.Pipe)
}
func (a *ActionNode) tree() *Tree {
return a.tr
}
func (a *ActionNode) Copy() Node {
return a.tr.newAction(a.Pos, a.Line, a.Pipe.CopyPipe())
}
// CommandNode holds a command (a pipeline inside an evaluating action).
type CommandNode struct {
NodeType
Pos
tr *Tree
Args []Node // Arguments in lexical order: Identifier, field, or constant.
}
func (t *Tree) newCommand(pos Pos) *CommandNode {
return &CommandNode{tr: t, NodeType: NodeCommand, Pos: pos}
}
func (c *CommandNode) append(arg Node) {
c.Args = append(c.Args, arg)
}
func (c *CommandNode) String() string {
s := ""
for i, arg := range c.Args {
if i > 0 {
s += " "
}
if arg, ok := arg.(*PipeNode); ok {
s += "(" + arg.String() + ")"
continue
}
s += arg.String()
}
return s
}
func (c *CommandNode) tree() *Tree {
return c.tr
}
func (c *CommandNode) Copy() Node {
if c == nil {
return c
}
n := c.tr.newCommand(c.Pos)
for _, c := range c.Args {
n.append(c.Copy())
}
return n
}
// IdentifierNode holds an identifier.
type IdentifierNode struct {
NodeType
Pos
tr *Tree
Ident string // The identifier's name.
}
// NewIdentifier returns a new IdentifierNode with the given identifier name.
func NewIdentifier(ident string) *IdentifierNode {
return &IdentifierNode{NodeType: NodeIdentifier, Ident: ident}
}
// SetPos sets the position. NewIdentifier is a public method so we can't modify its signature.
// Chained for convenience.
// TODO: fix one day?
func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode {
i.Pos = pos
return i
}
// SetTree sets the parent tree for the node. NewIdentifier is a public method so we can't modify its signature.
// Chained for convenience.
// TODO: fix one day?
func (i *IdentifierNode) SetTree(t *Tree) *IdentifierNode {
i.tr = t
return i
}
func (i *IdentifierNode) String() string {
return i.Ident
}
func (i *IdentifierNode) tree() *Tree {
return i.tr
}
func (i *IdentifierNode) Copy() Node {
return NewIdentifier(i.Ident).SetTree(i.tr).SetPos(i.Pos)
}
// VariableNode holds a list of variable names, possibly with chained field
// accesses. The dollar sign is part of the (first) name.
type VariableNode struct {
NodeType
Pos
tr *Tree
Ident []string // Variable name and fields in lexical order.
}
func (t *Tree) newVariable(pos Pos, ident string) *VariableNode {
return &VariableNode{tr: t, NodeType: NodeVariable, Pos: pos, Ident: strings.Split(ident, ".")}
}
func (v *VariableNode) String() string {
s := ""
for i, id := range v.Ident {
if i > 0 {
s += "."
}
s += id
}
return s
}
func (v *VariableNode) tree() *Tree {
return v.tr
}
func (v *VariableNode) Copy() Node {
return &VariableNode{tr: v.tr, NodeType: NodeVariable, Pos: v.Pos, Ident: append([]string{}, v.Ident...)}
}
// DotNode holds the special identifier '.'.
type DotNode struct {
NodeType
Pos
tr *Tree
}
func (t *Tree) newDot(pos Pos) *DotNode {
return &DotNode{tr: t, NodeType: NodeDot, Pos: pos}
}
func (d *DotNode) Type() NodeType {
// Override method on embedded NodeType for API compatibility.
// TODO: Not really a problem; could change API without effect but
// api tool complains.
return NodeDot
}
func (d *DotNode) String() string {
return "."
}
func (d *DotNode) tree() *Tree {
return d.tr
}
func (d *DotNode) Copy() Node {
return d.tr.newDot(d.Pos)
}
// NilNode holds the special identifier 'nil' representing an untyped nil constant.
type NilNode struct {
NodeType
Pos
tr *Tree
}
func (t *Tree) newNil(pos Pos) *NilNode {
return &NilNode{tr: t, NodeType: NodeNil, Pos: pos}
}
func (n *NilNode) Type() NodeType {
// Override method on embedded NodeType for API compatibility.
// TODO: Not really a problem; could change API without effect but
// api tool complains.
return NodeNil
}
func (n *NilNode) String() string {
return "nil"
}
func (n *NilNode) tree() *Tree {
return n.tr
}
func (n *NilNode) Copy() Node {
return n.tr.newNil(n.Pos)
}
// FieldNode holds a field (identifier starting with '.').
// The names may be chained ('.x.y').
// The period is dropped from each ident.
type FieldNode struct {
NodeType
Pos
tr *Tree
Ident []string // The identifiers in lexical order.
}
func (t *Tree) newField(pos Pos, ident string) *FieldNode {
return &FieldNode{tr: t, NodeType: NodeField, Pos: pos, Ident: strings.Split(ident[1:], ".")} // [1:] to drop leading period
}
func (f *FieldNode) String() string {
s := ""
for _, id := range f.Ident {
s += "." + id
}
return s
}
func (f *FieldNode) tree() *Tree {
return f.tr
}
func (f *FieldNode) Copy() Node {
return &FieldNode{tr: f.tr, NodeType: NodeField, Pos: f.Pos, Ident: append([]string{}, f.Ident...)}
}
// ChainNode holds a term followed by a chain of field accesses (identifier starting with '.').
// The names may be chained ('.x.y').
// The periods are dropped from each ident.
type ChainNode struct {
NodeType
Pos
tr *Tree
Node Node
Field []string // The identifiers in lexical order.
}
func (t *Tree) newChain(pos Pos, node Node) *ChainNode {
return &ChainNode{tr: t, NodeType: NodeChain, Pos: pos, Node: node}
}
// Add adds the named field (which should start with a period) to the end of the chain.
func (c *ChainNode) Add(field string) {
if len(field) == 0 || field[0] != '.' {
panic("no dot in field")
}
field = field[1:] // Remove leading dot.
if field == "" {
panic("empty field")
}
c.Field = append(c.Field, field)
}
func (c *ChainNode) String() string {
s := c.Node.String()
if _, ok := c.Node.(*PipeNode); ok {
s = "(" + s + ")"
}
for _, field := range c.Field {
s += "." + field
}
return s
}
func (c *ChainNode) tree() *Tree {
return c.tr
}
func (c *ChainNode) Copy() Node {
return &ChainNode{tr: c.tr, NodeType: NodeChain, Pos: c.Pos, Node: c.Node, Field: append([]string{}, c.Field...)}
}
// BoolNode holds a boolean constant.
type BoolNode struct {
NodeType
Pos
tr *Tree
True bool // The value of the boolean constant.
}
func (t *Tree) newBool(pos Pos, true bool) *BoolNode {
return &BoolNode{tr: t, NodeType: NodeBool, Pos: pos, True: true}
}
func (b *BoolNode) String() string {
if b.True {
return "true"
}
return "false"
}
func (b *BoolNode) tree() *Tree {
return b.tr
}
func (b *BoolNode) Copy() Node {
return b.tr.newBool(b.Pos, b.True)
}
// NumberNode holds a number: signed or unsigned integer, float, or complex.
// The value is parsed and stored under all the types that can represent the value.
// This simulates in a small amount of code the behavior of Go's ideal constants.
type NumberNode struct {
NodeType
Pos
tr *Tree
IsInt bool // Number has an integral value.
IsUint bool // Number has an unsigned integral value.
IsFloat bool // Number has a floating-point value.
IsComplex bool // Number is complex.
Int64 int64 // The signed integer value.
Uint64 uint64 // The unsigned integer value.
Float64 float64 // The floating-point value.
Complex128 complex128 // The complex value.
Text string // The original textual representation from the input.
}
func (t *Tree) newNumber(pos Pos, text string, typ itemType) (*NumberNode, error) {
n := &NumberNode{tr: t, NodeType: NodeNumber, Pos: pos, Text: text}
switch typ {
case itemCharConstant:
rune, _, tail, err := strconv.UnquoteChar(text[1:], text[0])
if err != nil {
return nil, err
}
if tail != "'" {
return nil, fmt.Errorf("malformed character constant: %s", text)
}
n.Int64 = int64(rune)
n.IsInt = true
n.Uint64 = uint64(rune)
n.IsUint = true
n.Float64 = float64(rune) // odd but those are the rules.
n.IsFloat = true
return n, nil
case itemComplex:
// fmt.Sscan can parse the pair, so let it do the work.
if _, err := fmt.Sscan(text, &n.Complex128); err != nil {
return nil, err
}
n.IsComplex = true
n.simplifyComplex()
return n, nil
}
// Imaginary constants can only be complex unless they are zero.
if len(text) > 0 && text[len(text)-1] == 'i' {
f, err := strconv.ParseFloat(text[:len(text)-1], 64)
if err == nil {
n.IsComplex = true
n.Complex128 = complex(0, f)
n.simplifyComplex()
return n, nil
}
}
// Do integer test first so we get 0x123 etc.
u, err := strconv.ParseUint(text, 0, 64) // will fail for -0; fixed below.
if err == nil {
n.IsUint = true
n.Uint64 = u
}
i, err := strconv.ParseInt(text, 0, 64)
if err == nil {
n.IsInt = true
n.Int64 = i
if i == 0 {
n.IsUint = true // in case of -0.
n.Uint64 = u
}
}
// If an integer extraction succeeded, promote the float.
if n.IsInt {
n.IsFloat = true
n.Float64 = float64(n.Int64)
} else if n.IsUint {
n.IsFloat = true
n.Float64 = float64(n.Uint64)
} else {
f, err := strconv.ParseFloat(text, 64)
if err == nil {
n.IsFloat = true
n.Float64 = f
// If a floating-point extraction succeeded, extract the int if needed.
if !n.IsInt && float64(int64(f)) == f {
n.IsInt = true
n.Int64 = int64(f)
}
if !n.IsUint && float64(uint64(f)) == f {
n.IsUint = true
n.Uint64 = uint64(f)
}
}
}
if !n.IsInt && !n.IsUint && !n.IsFloat {
return nil, fmt.Errorf("illegal number syntax: %q", text)
}
return n, nil
}
// simplifyComplex pulls out any other types that are represented by the complex number.
// These all require that the imaginary part be zero.
func (n *NumberNode) simplifyComplex() {
n.IsFloat = imag(n.Complex128) == 0
if n.IsFloat {
n.Float64 = real(n.Complex128)
n.IsInt = float64(int64(n.Float64)) == n.Float64
if n.IsInt {
n.Int64 = int64(n.Float64)
}
n.IsUint = float64(uint64(n.Float64)) == n.Float64
if n.IsUint {
n.Uint64 = uint64(n.Float64)
}
}
}
func (n *NumberNode) String() string {
return n.Text
}
func (n *NumberNode) tree() *Tree {
return n.tr
}
func (n *NumberNode) Copy() Node {
nn := new(NumberNode)
*nn = *n // Easy, fast, correct.
return nn
}
// StringNode holds a string constant. The value has been "unquoted".
type StringNode struct {
NodeType
Pos
tr *Tree
Quoted string // The original text of the string, with quotes.
Text string // The string, after quote processing.
}
func (t *Tree) newString(pos Pos, orig, text string) *StringNode {
return &StringNode{tr: t, NodeType: NodeString, Pos: pos, Quoted: orig, Text: text}
}
func (s *StringNode) String() string {
return s.Quoted
}
func (s *StringNode) tree() *Tree {
return s.tr
}
func (s *StringNode) Copy() Node {
return s.tr.newString(s.Pos, s.Quoted, s.Text)
}
// endNode represents an {{end}} action.
// It does not appear in the final parse tree.
type endNode struct {
NodeType
Pos
tr *Tree
}
func (t *Tree) newEnd(pos Pos) *endNode {
return &endNode{tr: t, NodeType: nodeEnd, Pos: pos}
}
func (e *endNode) String() string {
return "{{end}}"
}
func (e *endNode) tree() *Tree {
return e.tr
}
func (e *endNode) Copy() Node {
return e.tr.newEnd(e.Pos)
}
// elseNode represents an {{else}} action. Does not appear in the final tree.
type elseNode struct {
NodeType
Pos
tr *Tree
Line int // The line number in the input (deprecated; kept for compatibility)
}
func (t *Tree) newElse(pos Pos, line int) *elseNode {
return &elseNode{tr: t, NodeType: nodeElse, Pos: pos, Line: line}
}
func (e *elseNode) Type() NodeType {
return nodeElse
}
func (e *elseNode) String() string {
return "{{else}}"
}
func (e *elseNode) tree() *Tree {
return e.tr
}
func (e *elseNode) Copy() Node {
return e.tr.newElse(e.Pos, e.Line)
}
// BranchNode is the common representation of if, range, and with.
type BranchNode struct {
NodeType
Pos
tr *Tree
Line int // The line number in the input (deprecated; kept for compatibility)
Pipe *PipeNode // The pipeline to be evaluated.
List *ListNode // What to execute if the value is non-empty.
ElseList *ListNode // What to execute if the value is empty (nil if absent).
}
func (b *BranchNode) String() string {
name := ""
switch b.NodeType {
case NodeIf:
name = "if"
case NodeRange:
name = "range"
case NodeWith:
name = "with"
default:
panic("unknown branch type")
}
if b.ElseList != nil {
return fmt.Sprintf("{{%s %s}}%s{{else}}%s{{end}}", name, b.Pipe, b.List, b.ElseList)
}
return fmt.Sprintf("{{%s %s}}%s{{end}}", name, b.Pipe, b.List)
}
func (b *BranchNode) tree() *Tree {
return b.tr
}
func (b *BranchNode) Copy() Node {
switch b.NodeType {
case NodeIf:
return b.tr.newIf(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
case NodeRange:
return b.tr.newRange(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
case NodeWith:
return b.tr.newWith(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
default:
panic("unknown branch type")
}
}
// IfNode represents an {{if}} action and its commands.
type IfNode struct {
BranchNode
}
func (t *Tree) newIf(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *IfNode {
return &IfNode{BranchNode{tr: t, NodeType: NodeIf, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
}
func (i *IfNode) Copy() Node {
return i.tr.newIf(i.Pos, i.Line, i.Pipe.CopyPipe(), i.List.CopyList(), i.ElseList.CopyList())
}
// RangeNode represents a {{range}} action and its commands.
type RangeNode struct {
BranchNode
}
func (t *Tree) newRange(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *RangeNode {
return &RangeNode{BranchNode{tr: t, NodeType: NodeRange, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
}
func (r *RangeNode) Copy() Node {
return r.tr.newRange(r.Pos, r.Line, r.Pipe.CopyPipe(), r.List.CopyList(), r.ElseList.CopyList())
}
// WithNode represents a {{with}} action and its commands.
type WithNode struct {
BranchNode
}
func (t *Tree) newWith(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *WithNode {
return &WithNode{BranchNode{tr: t, NodeType: NodeWith, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
}
func (w *WithNode) Copy() Node {
return w.tr.newWith(w.Pos, w.Line, w.Pipe.CopyPipe(), w.List.CopyList(), w.ElseList.CopyList())
}
// TemplateNode represents a {{template}} action.
type TemplateNode struct {
NodeType
Pos
tr *Tree
Line int // The line number in the input (deprecated; kept for compatibility)
Name string // The name of the template (unquoted).
Pipe *PipeNode // The command to evaluate as dot for the template.
}
func (t *Tree) newTemplate(pos Pos, line int, name string, pipe *PipeNode) *TemplateNode {
return &TemplateNode{tr: t, NodeType: NodeTemplate, Pos: pos, Line: line, Name: name, Pipe: pipe}
}
func (t *TemplateNode) String() string {
if t.Pipe == nil {
return fmt.Sprintf("{{template %q}}", t.Name)
}
return fmt.Sprintf("{{template %q %s}}", t.Name, t.Pipe)
}
func (t *TemplateNode) tree() *Tree {
return t.tr
}
func (t *TemplateNode) Copy() Node {
return t.tr.newTemplate(t.Pos, t.Line, t.Name, t.Pipe.CopyPipe())
}

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vendor/github.com/alecthomas/template/parse/parse.go generated vendored Normal file
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@ -0,0 +1,700 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package parse builds parse trees for templates as defined by text/template
// and html/template. Clients should use those packages to construct templates
// rather than this one, which provides shared internal data structures not
// intended for general use.
package parse
import (
"bytes"
"fmt"
"runtime"
"strconv"
"strings"
)
// Tree is the representation of a single parsed template.
type Tree struct {
Name string // name of the template represented by the tree.
ParseName string // name of the top-level template during parsing, for error messages.
Root *ListNode // top-level root of the tree.
text string // text parsed to create the template (or its parent)
// Parsing only; cleared after parse.
funcs []map[string]interface{}
lex *lexer
token [3]item // three-token lookahead for parser.
peekCount int
vars []string // variables defined at the moment.
}
// Copy returns a copy of the Tree. Any parsing state is discarded.
func (t *Tree) Copy() *Tree {
if t == nil {
return nil
}
return &Tree{
Name: t.Name,
ParseName: t.ParseName,
Root: t.Root.CopyList(),
text: t.text,
}
}
// Parse returns a map from template name to parse.Tree, created by parsing the
// templates described in the argument string. The top-level template will be
// given the specified name. If an error is encountered, parsing stops and an
// empty map is returned with the error.
func Parse(name, text, leftDelim, rightDelim string, funcs ...map[string]interface{}) (treeSet map[string]*Tree, err error) {
treeSet = make(map[string]*Tree)
t := New(name)
t.text = text
_, err = t.Parse(text, leftDelim, rightDelim, treeSet, funcs...)
return
}
// next returns the next token.
func (t *Tree) next() item {
if t.peekCount > 0 {
t.peekCount--
} else {
t.token[0] = t.lex.nextItem()
}
return t.token[t.peekCount]
}
// backup backs the input stream up one token.
func (t *Tree) backup() {
t.peekCount++
}
// backup2 backs the input stream up two tokens.
// The zeroth token is already there.
func (t *Tree) backup2(t1 item) {
t.token[1] = t1
t.peekCount = 2
}
// backup3 backs the input stream up three tokens
// The zeroth token is already there.
func (t *Tree) backup3(t2, t1 item) { // Reverse order: we're pushing back.
t.token[1] = t1
t.token[2] = t2
t.peekCount = 3
}
// peek returns but does not consume the next token.
func (t *Tree) peek() item {
if t.peekCount > 0 {
return t.token[t.peekCount-1]
}
t.peekCount = 1
t.token[0] = t.lex.nextItem()
return t.token[0]
}
// nextNonSpace returns the next non-space token.
func (t *Tree) nextNonSpace() (token item) {
for {
token = t.next()
if token.typ != itemSpace {
break
}
}
return token
}
// peekNonSpace returns but does not consume the next non-space token.
func (t *Tree) peekNonSpace() (token item) {
for {
token = t.next()
if token.typ != itemSpace {
break
}
}
t.backup()
return token
}
// Parsing.
// New allocates a new parse tree with the given name.
func New(name string, funcs ...map[string]interface{}) *Tree {
return &Tree{
Name: name,
funcs: funcs,
}
}
// ErrorContext returns a textual representation of the location of the node in the input text.
// The receiver is only used when the node does not have a pointer to the tree inside,
// which can occur in old code.
func (t *Tree) ErrorContext(n Node) (location, context string) {
pos := int(n.Position())
tree := n.tree()
if tree == nil {
tree = t
}
text := tree.text[:pos]
byteNum := strings.LastIndex(text, "\n")
if byteNum == -1 {
byteNum = pos // On first line.
} else {
byteNum++ // After the newline.
byteNum = pos - byteNum
}
lineNum := 1 + strings.Count(text, "\n")
context = n.String()
if len(context) > 20 {
context = fmt.Sprintf("%.20s...", context)
}
return fmt.Sprintf("%s:%d:%d", tree.ParseName, lineNum, byteNum), context
}
// errorf formats the error and terminates processing.
func (t *Tree) errorf(format string, args ...interface{}) {
t.Root = nil
format = fmt.Sprintf("template: %s:%d: %s", t.ParseName, t.lex.lineNumber(), format)
panic(fmt.Errorf(format, args...))
}
// error terminates processing.
func (t *Tree) error(err error) {
t.errorf("%s", err)
}
// expect consumes the next token and guarantees it has the required type.
func (t *Tree) expect(expected itemType, context string) item {
token := t.nextNonSpace()
if token.typ != expected {
t.unexpected(token, context)
}
return token
}
// expectOneOf consumes the next token and guarantees it has one of the required types.
func (t *Tree) expectOneOf(expected1, expected2 itemType, context string) item {
token := t.nextNonSpace()
if token.typ != expected1 && token.typ != expected2 {
t.unexpected(token, context)
}
return token
}
// unexpected complains about the token and terminates processing.
func (t *Tree) unexpected(token item, context string) {
t.errorf("unexpected %s in %s", token, context)
}
// recover is the handler that turns panics into returns from the top level of Parse.
func (t *Tree) recover(errp *error) {
e := recover()
if e != nil {
if _, ok := e.(runtime.Error); ok {
panic(e)
}
if t != nil {
t.stopParse()
}
*errp = e.(error)
}
return
}
// startParse initializes the parser, using the lexer.
func (t *Tree) startParse(funcs []map[string]interface{}, lex *lexer) {
t.Root = nil
t.lex = lex
t.vars = []string{"$"}
t.funcs = funcs
}
// stopParse terminates parsing.
func (t *Tree) stopParse() {
t.lex = nil
t.vars = nil
t.funcs = nil
}
// Parse parses the template definition string to construct a representation of
// the template for execution. If either action delimiter string is empty, the
// default ("{{" or "}}") is used. Embedded template definitions are added to
// the treeSet map.
func (t *Tree) Parse(text, leftDelim, rightDelim string, treeSet map[string]*Tree, funcs ...map[string]interface{}) (tree *Tree, err error) {
defer t.recover(&err)
t.ParseName = t.Name
t.startParse(funcs, lex(t.Name, text, leftDelim, rightDelim))
t.text = text
t.parse(treeSet)
t.add(treeSet)
t.stopParse()
return t, nil
}
// add adds tree to the treeSet.
func (t *Tree) add(treeSet map[string]*Tree) {
tree := treeSet[t.Name]
if tree == nil || IsEmptyTree(tree.Root) {
treeSet[t.Name] = t
return
}
if !IsEmptyTree(t.Root) {
t.errorf("template: multiple definition of template %q", t.Name)
}
}
// IsEmptyTree reports whether this tree (node) is empty of everything but space.
func IsEmptyTree(n Node) bool {
switch n := n.(type) {
case nil:
return true
case *ActionNode:
case *IfNode:
case *ListNode:
for _, node := range n.Nodes {
if !IsEmptyTree(node) {
return false
}
}
return true
case *RangeNode:
case *TemplateNode:
case *TextNode:
return len(bytes.TrimSpace(n.Text)) == 0
case *WithNode:
default:
panic("unknown node: " + n.String())
}
return false
}
// parse is the top-level parser for a template, essentially the same
// as itemList except it also parses {{define}} actions.
// It runs to EOF.
func (t *Tree) parse(treeSet map[string]*Tree) (next Node) {
t.Root = t.newList(t.peek().pos)
for t.peek().typ != itemEOF {
if t.peek().typ == itemLeftDelim {
delim := t.next()
if t.nextNonSpace().typ == itemDefine {
newT := New("definition") // name will be updated once we know it.
newT.text = t.text
newT.ParseName = t.ParseName
newT.startParse(t.funcs, t.lex)
newT.parseDefinition(treeSet)
continue
}
t.backup2(delim)
}
n := t.textOrAction()
if n.Type() == nodeEnd {
t.errorf("unexpected %s", n)
}
t.Root.append(n)
}
return nil
}
// parseDefinition parses a {{define}} ... {{end}} template definition and
// installs the definition in the treeSet map. The "define" keyword has already
// been scanned.
func (t *Tree) parseDefinition(treeSet map[string]*Tree) {
const context = "define clause"
name := t.expectOneOf(itemString, itemRawString, context)
var err error
t.Name, err = strconv.Unquote(name.val)
if err != nil {
t.error(err)
}
t.expect(itemRightDelim, context)
var end Node
t.Root, end = t.itemList()
if end.Type() != nodeEnd {
t.errorf("unexpected %s in %s", end, context)
}
t.add(treeSet)
t.stopParse()
}
// itemList:
// textOrAction*
// Terminates at {{end}} or {{else}}, returned separately.
func (t *Tree) itemList() (list *ListNode, next Node) {
list = t.newList(t.peekNonSpace().pos)
for t.peekNonSpace().typ != itemEOF {
n := t.textOrAction()
switch n.Type() {
case nodeEnd, nodeElse:
return list, n
}
list.append(n)
}
t.errorf("unexpected EOF")
return
}
// textOrAction:
// text | action
func (t *Tree) textOrAction() Node {
switch token := t.nextNonSpace(); token.typ {
case itemElideNewline:
return t.elideNewline()
case itemText:
return t.newText(token.pos, token.val)
case itemLeftDelim:
return t.action()
default:
t.unexpected(token, "input")
}
return nil
}
// elideNewline:
// Remove newlines trailing rightDelim if \\ is present.
func (t *Tree) elideNewline() Node {
token := t.peek()
if token.typ != itemText {
t.unexpected(token, "input")
return nil
}
t.next()
stripped := strings.TrimLeft(token.val, "\n\r")
diff := len(token.val) - len(stripped)
if diff > 0 {
// This is a bit nasty. We mutate the token in-place to remove
// preceding newlines.
token.pos += Pos(diff)
token.val = stripped
}
return t.newText(token.pos, token.val)
}
// Action:
// control
// command ("|" command)*
// Left delim is past. Now get actions.
// First word could be a keyword such as range.
func (t *Tree) action() (n Node) {
switch token := t.nextNonSpace(); token.typ {
case itemElse:
return t.elseControl()
case itemEnd:
return t.endControl()
case itemIf:
return t.ifControl()
case itemRange:
return t.rangeControl()
case itemTemplate:
return t.templateControl()
case itemWith:
return t.withControl()
}
t.backup()
// Do not pop variables; they persist until "end".
return t.newAction(t.peek().pos, t.lex.lineNumber(), t.pipeline("command"))
}
// Pipeline:
// declarations? command ('|' command)*
func (t *Tree) pipeline(context string) (pipe *PipeNode) {
var decl []*VariableNode
pos := t.peekNonSpace().pos
// Are there declarations?
for {
if v := t.peekNonSpace(); v.typ == itemVariable {
t.next()
// Since space is a token, we need 3-token look-ahead here in the worst case:
// in "$x foo" we need to read "foo" (as opposed to ":=") to know that $x is an
// argument variable rather than a declaration. So remember the token
// adjacent to the variable so we can push it back if necessary.
tokenAfterVariable := t.peek()
if next := t.peekNonSpace(); next.typ == itemColonEquals || (next.typ == itemChar && next.val == ",") {
t.nextNonSpace()
variable := t.newVariable(v.pos, v.val)
decl = append(decl, variable)
t.vars = append(t.vars, v.val)
if next.typ == itemChar && next.val == "," {
if context == "range" && len(decl) < 2 {
continue
}
t.errorf("too many declarations in %s", context)
}
} else if tokenAfterVariable.typ == itemSpace {
t.backup3(v, tokenAfterVariable)
} else {
t.backup2(v)
}
}
break
}
pipe = t.newPipeline(pos, t.lex.lineNumber(), decl)
for {
switch token := t.nextNonSpace(); token.typ {
case itemRightDelim, itemRightParen:
if len(pipe.Cmds) == 0 {
t.errorf("missing value for %s", context)
}
if token.typ == itemRightParen {
t.backup()
}
return
case itemBool, itemCharConstant, itemComplex, itemDot, itemField, itemIdentifier,
itemNumber, itemNil, itemRawString, itemString, itemVariable, itemLeftParen:
t.backup()
pipe.append(t.command())
default:
t.unexpected(token, context)
}
}
}
func (t *Tree) parseControl(allowElseIf bool, context string) (pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) {
defer t.popVars(len(t.vars))
line = t.lex.lineNumber()
pipe = t.pipeline(context)
var next Node
list, next = t.itemList()
switch next.Type() {
case nodeEnd: //done
case nodeElse:
if allowElseIf {
// Special case for "else if". If the "else" is followed immediately by an "if",
// the elseControl will have left the "if" token pending. Treat
// {{if a}}_{{else if b}}_{{end}}
// as
// {{if a}}_{{else}}{{if b}}_{{end}}{{end}}.
// To do this, parse the if as usual and stop at it {{end}}; the subsequent{{end}}
// is assumed. This technique works even for long if-else-if chains.
// TODO: Should we allow else-if in with and range?
if t.peek().typ == itemIf {
t.next() // Consume the "if" token.
elseList = t.newList(next.Position())
elseList.append(t.ifControl())
// Do not consume the next item - only one {{end}} required.
break
}
}
elseList, next = t.itemList()
if next.Type() != nodeEnd {
t.errorf("expected end; found %s", next)
}
}
return pipe.Position(), line, pipe, list, elseList
}
// If:
// {{if pipeline}} itemList {{end}}
// {{if pipeline}} itemList {{else}} itemList {{end}}
// If keyword is past.
func (t *Tree) ifControl() Node {
return t.newIf(t.parseControl(true, "if"))
}
// Range:
// {{range pipeline}} itemList {{end}}
// {{range pipeline}} itemList {{else}} itemList {{end}}
// Range keyword is past.
func (t *Tree) rangeControl() Node {
return t.newRange(t.parseControl(false, "range"))
}
// With:
// {{with pipeline}} itemList {{end}}
// {{with pipeline}} itemList {{else}} itemList {{end}}
// If keyword is past.
func (t *Tree) withControl() Node {
return t.newWith(t.parseControl(false, "with"))
}
// End:
// {{end}}
// End keyword is past.
func (t *Tree) endControl() Node {
return t.newEnd(t.expect(itemRightDelim, "end").pos)
}
// Else:
// {{else}}
// Else keyword is past.
func (t *Tree) elseControl() Node {
// Special case for "else if".
peek := t.peekNonSpace()
if peek.typ == itemIf {
// We see "{{else if ... " but in effect rewrite it to {{else}}{{if ... ".
return t.newElse(peek.pos, t.lex.lineNumber())
}
return t.newElse(t.expect(itemRightDelim, "else").pos, t.lex.lineNumber())
}
// Template:
// {{template stringValue pipeline}}
// Template keyword is past. The name must be something that can evaluate
// to a string.
func (t *Tree) templateControl() Node {
var name string
token := t.nextNonSpace()
switch token.typ {
case itemString, itemRawString:
s, err := strconv.Unquote(token.val)
if err != nil {
t.error(err)
}
name = s
default:
t.unexpected(token, "template invocation")
}
var pipe *PipeNode
if t.nextNonSpace().typ != itemRightDelim {
t.backup()
// Do not pop variables; they persist until "end".
pipe = t.pipeline("template")
}
return t.newTemplate(token.pos, t.lex.lineNumber(), name, pipe)
}
// command:
// operand (space operand)*
// space-separated arguments up to a pipeline character or right delimiter.
// we consume the pipe character but leave the right delim to terminate the action.
func (t *Tree) command() *CommandNode {
cmd := t.newCommand(t.peekNonSpace().pos)
for {
t.peekNonSpace() // skip leading spaces.
operand := t.operand()
if operand != nil {
cmd.append(operand)
}
switch token := t.next(); token.typ {
case itemSpace:
continue
case itemError:
t.errorf("%s", token.val)
case itemRightDelim, itemRightParen:
t.backup()
case itemPipe:
default:
t.errorf("unexpected %s in operand; missing space?", token)
}
break
}
if len(cmd.Args) == 0 {
t.errorf("empty command")
}
return cmd
}
// operand:
// term .Field*
// An operand is a space-separated component of a command,
// a term possibly followed by field accesses.
// A nil return means the next item is not an operand.
func (t *Tree) operand() Node {
node := t.term()
if node == nil {
return nil
}
if t.peek().typ == itemField {
chain := t.newChain(t.peek().pos, node)
for t.peek().typ == itemField {
chain.Add(t.next().val)
}
// Compatibility with original API: If the term is of type NodeField
// or NodeVariable, just put more fields on the original.
// Otherwise, keep the Chain node.
// TODO: Switch to Chains always when we can.
switch node.Type() {
case NodeField:
node = t.newField(chain.Position(), chain.String())
case NodeVariable:
node = t.newVariable(chain.Position(), chain.String())
default:
node = chain
}
}
return node
}
// term:
// literal (number, string, nil, boolean)
// function (identifier)
// .
// .Field
// $
// '(' pipeline ')'
// A term is a simple "expression".
// A nil return means the next item is not a term.
func (t *Tree) term() Node {
switch token := t.nextNonSpace(); token.typ {
case itemError:
t.errorf("%s", token.val)
case itemIdentifier:
if !t.hasFunction(token.val) {
t.errorf("function %q not defined", token.val)
}
return NewIdentifier(token.val).SetTree(t).SetPos(token.pos)
case itemDot:
return t.newDot(token.pos)
case itemNil:
return t.newNil(token.pos)
case itemVariable:
return t.useVar(token.pos, token.val)
case itemField:
return t.newField(token.pos, token.val)
case itemBool:
return t.newBool(token.pos, token.val == "true")
case itemCharConstant, itemComplex, itemNumber:
number, err := t.newNumber(token.pos, token.val, token.typ)
if err != nil {
t.error(err)
}
return number
case itemLeftParen:
pipe := t.pipeline("parenthesized pipeline")
if token := t.next(); token.typ != itemRightParen {
t.errorf("unclosed right paren: unexpected %s", token)
}
return pipe
case itemString, itemRawString:
s, err := strconv.Unquote(token.val)
if err != nil {
t.error(err)
}
return t.newString(token.pos, token.val, s)
}
t.backup()
return nil
}
// hasFunction reports if a function name exists in the Tree's maps.
func (t *Tree) hasFunction(name string) bool {
for _, funcMap := range t.funcs {
if funcMap == nil {
continue
}
if funcMap[name] != nil {
return true
}
}
return false
}
// popVars trims the variable list to the specified length
func (t *Tree) popVars(n int) {
t.vars = t.vars[:n]
}
// useVar returns a node for a variable reference. It errors if the
// variable is not defined.
func (t *Tree) useVar(pos Pos, name string) Node {
v := t.newVariable(pos, name)
for _, varName := range t.vars {
if varName == v.Ident[0] {
return v
}
}
t.errorf("undefined variable %q", v.Ident[0])
return nil
}

218
vendor/github.com/alecthomas/template/template.go generated vendored Normal file
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"fmt"
"reflect"
"github.com/alecthomas/template/parse"
)
// common holds the information shared by related templates.
type common struct {
tmpl map[string]*Template
// We use two maps, one for parsing and one for execution.
// This separation makes the API cleaner since it doesn't
// expose reflection to the client.
parseFuncs FuncMap
execFuncs map[string]reflect.Value
}
// Template is the representation of a parsed template. The *parse.Tree
// field is exported only for use by html/template and should be treated
// as unexported by all other clients.
type Template struct {
name string
*parse.Tree
*common
leftDelim string
rightDelim string
}
// New allocates a new template with the given name.
func New(name string) *Template {
return &Template{
name: name,
}
}
// Name returns the name of the template.
func (t *Template) Name() string {
return t.name
}
// New allocates a new template associated with the given one and with the same
// delimiters. The association, which is transitive, allows one template to
// invoke another with a {{template}} action.
func (t *Template) New(name string) *Template {
t.init()
return &Template{
name: name,
common: t.common,
leftDelim: t.leftDelim,
rightDelim: t.rightDelim,
}
}
func (t *Template) init() {
if t.common == nil {
t.common = new(common)
t.tmpl = make(map[string]*Template)
t.parseFuncs = make(FuncMap)
t.execFuncs = make(map[string]reflect.Value)
}
}
// Clone returns a duplicate of the template, including all associated
// templates. The actual representation is not copied, but the name space of
// associated templates is, so further calls to Parse in the copy will add
// templates to the copy but not to the original. Clone can be used to prepare
// common templates and use them with variant definitions for other templates
// by adding the variants after the clone is made.
func (t *Template) Clone() (*Template, error) {
nt := t.copy(nil)
nt.init()
nt.tmpl[t.name] = nt
for k, v := range t.tmpl {
if k == t.name { // Already installed.
continue
}
// The associated templates share nt's common structure.
tmpl := v.copy(nt.common)
nt.tmpl[k] = tmpl
}
for k, v := range t.parseFuncs {
nt.parseFuncs[k] = v
}
for k, v := range t.execFuncs {
nt.execFuncs[k] = v
}
return nt, nil
}
// copy returns a shallow copy of t, with common set to the argument.
func (t *Template) copy(c *common) *Template {
nt := New(t.name)
nt.Tree = t.Tree
nt.common = c
nt.leftDelim = t.leftDelim
nt.rightDelim = t.rightDelim
return nt
}
// AddParseTree creates a new template with the name and parse tree
// and associates it with t.
func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) {
if t.common != nil && t.tmpl[name] != nil {
return nil, fmt.Errorf("template: redefinition of template %q", name)
}
nt := t.New(name)
nt.Tree = tree
t.tmpl[name] = nt
return nt, nil
}
// Templates returns a slice of the templates associated with t, including t
// itself.
func (t *Template) Templates() []*Template {
if t.common == nil {
return nil
}
// Return a slice so we don't expose the map.
m := make([]*Template, 0, len(t.tmpl))
for _, v := range t.tmpl {
m = append(m, v)
}
return m
}
// Delims sets the action delimiters to the specified strings, to be used in
// subsequent calls to Parse, ParseFiles, or ParseGlob. Nested template
// definitions will inherit the settings. An empty delimiter stands for the
// corresponding default: {{ or }}.
// The return value is the template, so calls can be chained.
func (t *Template) Delims(left, right string) *Template {
t.leftDelim = left
t.rightDelim = right
return t
}
// Funcs adds the elements of the argument map to the template's function map.
// It panics if a value in the map is not a function with appropriate return
// type. However, it is legal to overwrite elements of the map. The return
// value is the template, so calls can be chained.
func (t *Template) Funcs(funcMap FuncMap) *Template {
t.init()
addValueFuncs(t.execFuncs, funcMap)
addFuncs(t.parseFuncs, funcMap)
return t
}
// Lookup returns the template with the given name that is associated with t,
// or nil if there is no such template.
func (t *Template) Lookup(name string) *Template {
if t.common == nil {
return nil
}
return t.tmpl[name]
}
// Parse parses a string into a template. Nested template definitions will be
// associated with the top-level template t. Parse may be called multiple times
// to parse definitions of templates to associate with t. It is an error if a
// resulting template is non-empty (contains content other than template
// definitions) and would replace a non-empty template with the same name.
// (In multiple calls to Parse with the same receiver template, only one call
// can contain text other than space, comments, and template definitions.)
func (t *Template) Parse(text string) (*Template, error) {
t.init()
trees, err := parse.Parse(t.name, text, t.leftDelim, t.rightDelim, t.parseFuncs, builtins)
if err != nil {
return nil, err
}
// Add the newly parsed trees, including the one for t, into our common structure.
for name, tree := range trees {
// If the name we parsed is the name of this template, overwrite this template.
// The associate method checks it's not a redefinition.
tmpl := t
if name != t.name {
tmpl = t.New(name)
}
// Even if t == tmpl, we need to install it in the common.tmpl map.
if replace, err := t.associate(tmpl, tree); err != nil {
return nil, err
} else if replace {
tmpl.Tree = tree
}
tmpl.leftDelim = t.leftDelim
tmpl.rightDelim = t.rightDelim
}
return t, nil
}
// associate installs the new template into the group of templates associated
// with t. It is an error to reuse a name except to overwrite an empty
// template. The two are already known to share the common structure.
// The boolean return value reports wither to store this tree as t.Tree.
func (t *Template) associate(new *Template, tree *parse.Tree) (bool, error) {
if new.common != t.common {
panic("internal error: associate not common")
}
name := new.name
if old := t.tmpl[name]; old != nil {
oldIsEmpty := parse.IsEmptyTree(old.Root)
newIsEmpty := parse.IsEmptyTree(tree.Root)
if newIsEmpty {
// Whether old is empty or not, new is empty; no reason to replace old.
return false, nil
}
if !oldIsEmpty {
return false, fmt.Errorf("template: redefinition of template %q", name)
}
}
t.tmpl[name] = new
return true, nil
}

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vendor/github.com/boombuler/barcode/LICENSE generated vendored Normal file
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The MIT License (MIT)
Copyright (c) 2014 Florian Sundermann
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

18
vendor/github.com/boombuler/barcode/README.md generated vendored Normal file
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##Introduction##
This is a package for GO which can be used to create different types of barcodes.
##Supported Barcode Types##
* Aztec Code
* Codabar
* Code 128
* Code 39
* EAN 8
* EAN 13
* Datamatrix
* QR Codes
* 2 of 5
##Documentation##
See [GoDoc](https://godoc.org/github.com/boombuler/barcode)
To create a barcode use the Encode function from one of the subpackages.

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vendor/github.com/boombuler/barcode/barcode.go generated vendored Normal file
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package barcode
import "image"
// Contains some meta information about a barcode
type Metadata struct {
// the name of the barcode kind
CodeKind string
// contains 1 for 1D barcodes or 2 for 2D barcodes
Dimensions byte
}
// a rendered and encoded barcode
type Barcode interface {
image.Image
// returns some meta information about the barcode
Metadata() Metadata
// the data that was encoded in this barcode
Content() string
CheckSum() int
}

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vendor/github.com/boombuler/barcode/qr/alphanumeric.go generated vendored Normal file
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package qr
import (
"errors"
"fmt"
"strings"
"github.com/boombuler/barcode/utils"
)
const charSet string = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:"
func stringToAlphaIdx(content string) <-chan int {
result := make(chan int)
go func() {
for _, r := range content {
idx := strings.IndexRune(charSet, r)
result <- idx
if idx < 0 {
break
}
}
close(result)
}()
return result
}
func encodeAlphaNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
contentLenIsOdd := len(content)%2 == 1
contentBitCount := (len(content) / 2) * 11
if contentLenIsOdd {
contentBitCount += 6
}
vi := findSmallestVersionInfo(ecl, alphaNumericMode, contentBitCount)
if vi == nil {
return nil, nil, errors.New("To much data to encode")
}
res := new(utils.BitList)
res.AddBits(int(alphaNumericMode), 4)
res.AddBits(len(content), vi.charCountBits(alphaNumericMode))
encoder := stringToAlphaIdx(content)
for idx := 0; idx < len(content)/2; idx++ {
c1 := <-encoder
c2 := <-encoder
if c1 < 0 || c2 < 0 {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
}
res.AddBits(c1*45+c2, 11)
}
if contentLenIsOdd {
c := <-encoder
if c < 0 {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
}
res.AddBits(c, 6)
}
addPaddingAndTerminator(res, vi)
return res, vi, nil
}

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vendor/github.com/boombuler/barcode/qr/automatic.go generated vendored Normal file
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package qr
import (
"fmt"
"github.com/boombuler/barcode/utils"
)
func encodeAuto(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
bits, vi, _ := Numeric.getEncoder()(content, ecl)
if bits != nil && vi != nil {
return bits, vi, nil
}
bits, vi, _ = AlphaNumeric.getEncoder()(content, ecl)
if bits != nil && vi != nil {
return bits, vi, nil
}
bits, vi, _ = Unicode.getEncoder()(content, ecl)
if bits != nil && vi != nil {
return bits, vi, nil
}
return nil, nil, fmt.Errorf("No encoding found to encode \"%s\"", content)
}

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vendor/github.com/boombuler/barcode/qr/blocks.go generated vendored Normal file
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package qr
type block struct {
data []byte
ecc []byte
}
type blockList []*block
func splitToBlocks(data <-chan byte, vi *versionInfo) blockList {
result := make(blockList, vi.NumberOfBlocksInGroup1+vi.NumberOfBlocksInGroup2)
for b := 0; b < int(vi.NumberOfBlocksInGroup1); b++ {
blk := new(block)
blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup1)
for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup1); cw++ {
blk.data[cw] = <-data
}
blk.ecc = ec.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
result[b] = blk
}
for b := 0; b < int(vi.NumberOfBlocksInGroup2); b++ {
blk := new(block)
blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup2)
for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup2); cw++ {
blk.data[cw] = <-data
}
blk.ecc = ec.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
result[int(vi.NumberOfBlocksInGroup1)+b] = blk
}
return result
}
func (bl blockList) interleave(vi *versionInfo) []byte {
var maxCodewordCount int
if vi.DataCodeWordsPerBlockInGroup1 > vi.DataCodeWordsPerBlockInGroup2 {
maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup1)
} else {
maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup2)
}
resultLen := (vi.DataCodeWordsPerBlockInGroup1+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup1 +
(vi.DataCodeWordsPerBlockInGroup2+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup2
result := make([]byte, 0, resultLen)
for i := 0; i < maxCodewordCount; i++ {
for b := 0; b < len(bl); b++ {
if len(bl[b].data) > i {
result = append(result, bl[b].data[i])
}
}
}
for i := 0; i < int(vi.ErrorCorrectionCodewordsPerBlock); i++ {
for b := 0; b < len(bl); b++ {
result = append(result, bl[b].ecc[i])
}
}
return result
}

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vendor/github.com/boombuler/barcode/qr/encoder.go generated vendored Normal file
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// Package qr can be used to create QR barcodes.
package qr
import (
"image"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/utils"
)
type encodeFn func(content string, eccLevel ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error)
// Encoding mode for QR Codes.
type Encoding byte
const (
// Auto will choose ths best matching encoding
Auto Encoding = iota
// Numeric encoding only encodes numbers [0-9]
Numeric
// AlphaNumeric encoding only encodes uppercase letters, numbers and [Space], $, %, *, +, -, ., /, :
AlphaNumeric
// Unicode encoding encodes the string as utf-8
Unicode
// only for testing purpose
unknownEncoding
)
func (e Encoding) getEncoder() encodeFn {
switch e {
case Auto:
return encodeAuto
case Numeric:
return encodeNumeric
case AlphaNumeric:
return encodeAlphaNumeric
case Unicode:
return encodeUnicode
}
return nil
}
func (e Encoding) String() string {
switch e {
case Auto:
return "Auto"
case Numeric:
return "Numeric"
case AlphaNumeric:
return "AlphaNumeric"
case Unicode:
return "Unicode"
}
return ""
}
// Encode returns a QR barcode with the given content, error correction level and uses the given encoding
func Encode(content string, level ErrorCorrectionLevel, mode Encoding) (barcode.Barcode, error) {
bits, vi, err := mode.getEncoder()(content, level)
if err != nil {
return nil, err
}
blocks := splitToBlocks(bits.IterateBytes(), vi)
data := blocks.interleave(vi)
result := render(data, vi)
result.content = content
return result, nil
}
func render(data []byte, vi *versionInfo) *qrcode {
dim := vi.modulWidth()
results := make([]*qrcode, 8)
for i := 0; i < 8; i++ {
results[i] = newBarcode(dim)
}
occupied := newBarcode(dim)
setAll := func(x int, y int, val bool) {
occupied.Set(x, y, true)
for i := 0; i < 8; i++ {
results[i].Set(x, y, val)
}
}
drawFinderPatterns(vi, setAll)
drawAlignmentPatterns(occupied, vi, setAll)
//Timing Pattern:
var i int
for i = 0; i < dim; i++ {
if !occupied.Get(i, 6) {
setAll(i, 6, i%2 == 0)
}
if !occupied.Get(6, i) {
setAll(6, i, i%2 == 0)
}
}
// Dark Module
setAll(8, dim-8, true)
drawVersionInfo(vi, setAll)
drawFormatInfo(vi, -1, occupied.Set)
for i := 0; i < 8; i++ {
drawFormatInfo(vi, i, results[i].Set)
}
// Write the data
var curBitNo int
for pos := range iterateModules(occupied) {
var curBit bool
if curBitNo < len(data)*8 {
curBit = ((data[curBitNo/8] >> uint(7-(curBitNo%8))) & 1) == 1
} else {
curBit = false
}
for i := 0; i < 8; i++ {
setMasked(pos.X, pos.Y, curBit, i, results[i].Set)
}
curBitNo++
}
lowestPenalty := ^uint(0)
lowestPenaltyIdx := -1
for i := 0; i < 8; i++ {
p := results[i].calcPenalty()
if p < lowestPenalty {
lowestPenalty = p
lowestPenaltyIdx = i
}
}
return results[lowestPenaltyIdx]
}
func setMasked(x, y int, val bool, mask int, set func(int, int, bool)) {
switch mask {
case 0:
val = val != (((y + x) % 2) == 0)
break
case 1:
val = val != ((y % 2) == 0)
break
case 2:
val = val != ((x % 3) == 0)
break
case 3:
val = val != (((y + x) % 3) == 0)
break
case 4:
val = val != (((y/2 + x/3) % 2) == 0)
break
case 5:
val = val != (((y*x)%2)+((y*x)%3) == 0)
break
case 6:
val = val != ((((y*x)%2)+((y*x)%3))%2 == 0)
break
case 7:
val = val != ((((y+x)%2)+((y*x)%3))%2 == 0)
}
set(x, y, val)
}
func iterateModules(occupied *qrcode) <-chan image.Point {
result := make(chan image.Point)
allPoints := make(chan image.Point)
go func() {
curX := occupied.dimension - 1
curY := occupied.dimension - 1
isUpward := true
for true {
if isUpward {
allPoints <- image.Pt(curX, curY)
allPoints <- image.Pt(curX-1, curY)
curY--
if curY < 0 {
curY = 0
curX -= 2
if curX == 6 {
curX--
}
if curX < 0 {
break
}
isUpward = false
}
} else {
allPoints <- image.Pt(curX, curY)
allPoints <- image.Pt(curX-1, curY)
curY++
if curY >= occupied.dimension {
curY = occupied.dimension - 1
curX -= 2
if curX == 6 {
curX--
}
isUpward = true
if curX < 0 {
break
}
}
}
}
close(allPoints)
}()
go func() {
for pt := range allPoints {
if !occupied.Get(pt.X, pt.Y) {
result <- pt
}
}
close(result)
}()
return result
}
func drawFinderPatterns(vi *versionInfo, set func(int, int, bool)) {
dim := vi.modulWidth()
drawPattern := func(xoff int, yoff int) {
for x := -1; x < 8; x++ {
for y := -1; y < 8; y++ {
val := (x == 0 || x == 6 || y == 0 || y == 6 || (x > 1 && x < 5 && y > 1 && y < 5)) && (x <= 6 && y <= 6 && x >= 0 && y >= 0)
if x+xoff >= 0 && x+xoff < dim && y+yoff >= 0 && y+yoff < dim {
set(x+xoff, y+yoff, val)
}
}
}
}
drawPattern(0, 0)
drawPattern(0, dim-7)
drawPattern(dim-7, 0)
}
func drawAlignmentPatterns(occupied *qrcode, vi *versionInfo, set func(int, int, bool)) {
drawPattern := func(xoff int, yoff int) {
for x := -2; x <= 2; x++ {
for y := -2; y <= 2; y++ {
val := x == -2 || x == 2 || y == -2 || y == 2 || (x == 0 && y == 0)
set(x+xoff, y+yoff, val)
}
}
}
positions := vi.alignmentPatternPlacements()
for _, x := range positions {
for _, y := range positions {
if occupied.Get(x, y) {
continue
}
drawPattern(x, y)
}
}
}
var formatInfos = map[ErrorCorrectionLevel]map[int][]bool{
L: {
0: []bool{true, true, true, false, true, true, true, true, true, false, false, false, true, false, false},
1: []bool{true, true, true, false, false, true, false, true, true, true, true, false, false, true, true},
2: []bool{true, true, true, true, true, false, true, true, false, true, false, true, false, true, false},
3: []bool{true, true, true, true, false, false, false, true, false, false, true, true, true, false, true},
4: []bool{true, true, false, false, true, true, false, false, false, true, false, true, true, true, true},
5: []bool{true, true, false, false, false, true, true, false, false, false, true, true, false, false, false},
6: []bool{true, true, false, true, true, false, false, false, true, false, false, false, false, false, true},
7: []bool{true, true, false, true, false, false, true, false, true, true, true, false, true, true, false},
},
M: {
0: []bool{true, false, true, false, true, false, false, false, false, false, true, false, false, true, false},
1: []bool{true, false, true, false, false, false, true, false, false, true, false, false, true, false, true},
2: []bool{true, false, true, true, true, true, false, false, true, true, true, true, true, false, false},
3: []bool{true, false, true, true, false, true, true, false, true, false, false, true, false, true, true},
4: []bool{true, false, false, false, true, false, true, true, true, true, true, true, false, false, true},
5: []bool{true, false, false, false, false, false, false, true, true, false, false, true, true, true, false},
6: []bool{true, false, false, true, true, true, true, true, false, false, true, false, true, true, true},
7: []bool{true, false, false, true, false, true, false, true, false, true, false, false, false, false, false},
},
Q: {
0: []bool{false, true, true, false, true, false, true, false, true, false, true, true, true, true, true},
1: []bool{false, true, true, false, false, false, false, false, true, true, false, true, false, false, false},
2: []bool{false, true, true, true, true, true, true, false, false, true, true, false, false, false, true},
3: []bool{false, true, true, true, false, true, false, false, false, false, false, false, true, true, false},
4: []bool{false, true, false, false, true, false, false, true, false, true, true, false, true, false, false},
5: []bool{false, true, false, false, false, false, true, true, false, false, false, false, false, true, true},
6: []bool{false, true, false, true, true, true, false, true, true, false, true, true, false, true, false},
7: []bool{false, true, false, true, false, true, true, true, true, true, false, true, true, false, true},
},
H: {
0: []bool{false, false, true, false, true, true, false, true, false, false, false, true, false, false, true},
1: []bool{false, false, true, false, false, true, true, true, false, true, true, true, true, true, false},
2: []bool{false, false, true, true, true, false, false, true, true, true, false, false, true, true, true},
3: []bool{false, false, true, true, false, false, true, true, true, false, true, false, false, false, false},
4: []bool{false, false, false, false, true, true, true, false, true, true, false, false, false, true, false},
5: []bool{false, false, false, false, false, true, false, false, true, false, true, false, true, false, true},
6: []bool{false, false, false, true, true, false, true, false, false, false, false, true, true, false, false},
7: []bool{false, false, false, true, false, false, false, false, false, true, true, true, false, true, true},
},
}
func drawFormatInfo(vi *versionInfo, usedMask int, set func(int, int, bool)) {
var formatInfo []bool
if usedMask == -1 {
formatInfo = []bool{true, true, true, true, true, true, true, true, true, true, true, true, true, true, true} // Set all to true cause -1 --> occupied mask.
} else {
formatInfo = formatInfos[vi.Level][usedMask]
}
if len(formatInfo) == 15 {
dim := vi.modulWidth()
set(0, 8, formatInfo[0])
set(1, 8, formatInfo[1])
set(2, 8, formatInfo[2])
set(3, 8, formatInfo[3])
set(4, 8, formatInfo[4])
set(5, 8, formatInfo[5])
set(7, 8, formatInfo[6])
set(8, 8, formatInfo[7])
set(8, 7, formatInfo[8])
set(8, 5, formatInfo[9])
set(8, 4, formatInfo[10])
set(8, 3, formatInfo[11])
set(8, 2, formatInfo[12])
set(8, 1, formatInfo[13])
set(8, 0, formatInfo[14])
set(8, dim-1, formatInfo[0])
set(8, dim-2, formatInfo[1])
set(8, dim-3, formatInfo[2])
set(8, dim-4, formatInfo[3])
set(8, dim-5, formatInfo[4])
set(8, dim-6, formatInfo[5])
set(8, dim-7, formatInfo[6])
set(dim-8, 8, formatInfo[7])
set(dim-7, 8, formatInfo[8])
set(dim-6, 8, formatInfo[9])
set(dim-5, 8, formatInfo[10])
set(dim-4, 8, formatInfo[11])
set(dim-3, 8, formatInfo[12])
set(dim-2, 8, formatInfo[13])
set(dim-1, 8, formatInfo[14])
}
}
var versionInfoBitsByVersion = map[byte][]bool{
7: []bool{false, false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false},
8: []bool{false, false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false},
9: []bool{false, false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true},
10: []bool{false, false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true},
11: []bool{false, false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false},
12: []bool{false, false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false},
13: []bool{false, false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true},
14: []bool{false, false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true},
15: []bool{false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false},
16: []bool{false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false},
17: []bool{false, true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true},
18: []bool{false, true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true},
19: []bool{false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false},
20: []bool{false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true, false},
21: []bool{false, true, false, true, false, true, false, true, true, false, true, false, false, false, false, false, true, true},
22: []bool{false, true, false, true, true, false, true, false, false, false, true, true, false, false, true, false, false, true},
23: []bool{false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false, false},
24: []bool{false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false, false},
25: []bool{false, true, true, false, false, true, false, false, false, true, true, true, true, false, false, false, false, true},
26: []bool{false, true, true, false, true, false, true, true, true, true, true, false, true, false, true, false, true, true},
27: []bool{false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true, false},
28: []bool{false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true, false},
29: []bool{false, true, true, true, false, true, false, false, true, true, false, false, true, true, true, true, true, true},
30: []bool{false, true, true, true, true, false, true, true, false, true, false, true, true, true, false, true, false, true},
31: []bool{false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false, false},
32: []bool{true, false, false, false, false, false, true, false, false, true, true, true, false, true, false, true, false, true},
33: []bool{true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false, false},
34: []bool{true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true, false},
35: []bool{true, false, false, false, true, true, false, true, true, true, true, false, false, true, true, true, true, true},
36: []bool{true, false, false, true, false, false, true, false, true, true, false, false, false, false, true, false, true, true},
37: []bool{true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true, false},
38: []bool{true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false, false},
39: []bool{true, false, false, true, true, true, false, true, false, true, false, true, false, false, false, false, false, true},
40: []bool{true, false, true, false, false, false, true, true, false, false, false, true, true, false, true, false, false, true},
}
func drawVersionInfo(vi *versionInfo, set func(int, int, bool)) {
versionInfoBits, ok := versionInfoBitsByVersion[vi.Version]
if ok && len(versionInfoBits) > 0 {
for i := 0; i < len(versionInfoBits); i++ {
x := (vi.modulWidth() - 11) + i%3
y := i / 3
set(x, y, versionInfoBits[len(versionInfoBits)-i-1])
set(y, x, versionInfoBits[len(versionInfoBits)-i-1])
}
}
}
func addPaddingAndTerminator(bl *utils.BitList, vi *versionInfo) {
for i := 0; i < 4 && bl.Len() < vi.totalDataBytes()*8; i++ {
bl.AddBit(false)
}
for bl.Len()%8 != 0 {
bl.AddBit(false)
}
for i := 0; bl.Len() < vi.totalDataBytes()*8; i++ {
if i%2 == 0 {
bl.AddByte(236)
} else {
bl.AddByte(17)
}
}
}

29
vendor/github.com/boombuler/barcode/qr/errorcorrection.go generated vendored Normal file
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@ -0,0 +1,29 @@
package qr
import (
"github.com/boombuler/barcode/utils"
)
type errorCorrection struct {
rs *utils.ReedSolomonEncoder
}
var ec = newErrorCorrection()
func newErrorCorrection() *errorCorrection {
fld := utils.NewGaloisField(285, 256, 0)
return &errorCorrection{utils.NewReedSolomonEncoder(fld)}
}
func (ec *errorCorrection) calcECC(data []byte, eccCount byte) []byte {
dataInts := make([]int, len(data))
for i := 0; i < len(data); i++ {
dataInts[i] = int(data[i])
}
res := ec.rs.Encode(dataInts, int(eccCount))
result := make([]byte, len(res))
for i := 0; i < len(res); i++ {
result[i] = byte(res[i])
}
return result
}

56
vendor/github.com/boombuler/barcode/qr/numeric.go generated vendored Normal file
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package qr
import (
"errors"
"fmt"
"strconv"
"github.com/boombuler/barcode/utils"
)
func encodeNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
contentBitCount := (len(content) / 3) * 10
switch len(content) % 3 {
case 1:
contentBitCount += 4
case 2:
contentBitCount += 7
}
vi := findSmallestVersionInfo(ecl, numericMode, contentBitCount)
if vi == nil {
return nil, nil, errors.New("To much data to encode")
}
res := new(utils.BitList)
res.AddBits(int(numericMode), 4)
res.AddBits(len(content), vi.charCountBits(numericMode))
for pos := 0; pos < len(content); pos += 3 {
var curStr string
if pos+3 <= len(content) {
curStr = content[pos : pos+3]
} else {
curStr = content[pos:]
}
i, err := strconv.Atoi(curStr)
if err != nil || i < 0 {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, Numeric)
}
var bitCnt byte
switch len(curStr) % 3 {
case 0:
bitCnt = 10
case 1:
bitCnt = 4
break
case 2:
bitCnt = 7
break
}
res.AddBits(i, bitCnt)
}
addPaddingAndTerminator(res, vi)
return res, vi, nil
}

170
vendor/github.com/boombuler/barcode/qr/qrcode.go generated vendored Normal file
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package qr
import (
"image"
"image/color"
"math"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/utils"
)
type qrcode struct {
dimension int
data *utils.BitList
content string
}
func (qr *qrcode) Content() string {
return qr.content
}
func (qr *qrcode) Metadata() barcode.Metadata {
return barcode.Metadata{"QR Code", 2}
}
func (qr *qrcode) ColorModel() color.Model {
return color.Gray16Model
}
func (qr *qrcode) Bounds() image.Rectangle {
return image.Rect(0, 0, qr.dimension, qr.dimension)
}
func (qr *qrcode) At(x, y int) color.Color {
if qr.Get(x, y) {
return color.Black
}
return color.White
}
func (qr *qrcode) Get(x, y int) bool {
return qr.data.GetBit(x*qr.dimension + y)
}
func (qr *qrcode) Set(x, y int, val bool) {
qr.data.SetBit(x*qr.dimension+y, val)
}
func (qr *qrcode) CheckSum() int {
return 0
}
func (qr *qrcode) calcPenalty() uint {
return qr.calcPenaltyRule1() + qr.calcPenaltyRule2() + qr.calcPenaltyRule3() + qr.calcPenaltyRule4()
}
func (qr *qrcode) calcPenaltyRule1() uint {
var result uint
for x := 0; x < qr.dimension; x++ {
checkForX := false
var cntX uint
checkForY := false
var cntY uint
for y := 0; y < qr.dimension; y++ {
if qr.Get(x, y) == checkForX {
cntX++
} else {
checkForX = !checkForX
if cntX >= 5 {
result += cntX - 2
}
cntX = 1
}
if qr.Get(y, x) == checkForY {
cntY++
} else {
checkForY = !checkForY
if cntY >= 5 {
result += cntY - 2
}
cntY = 1
}
}
if cntX >= 5 {
result += cntX - 2
}
if cntY >= 5 {
result += cntY - 2
}
}
return result
}
func (qr *qrcode) calcPenaltyRule2() uint {
var result uint
for x := 0; x < qr.dimension-1; x++ {
for y := 0; y < qr.dimension-1; y++ {
check := qr.Get(x, y)
if qr.Get(x, y+1) == check && qr.Get(x+1, y) == check && qr.Get(x+1, y+1) == check {
result += 3
}
}
}
return result
}
func (qr *qrcode) calcPenaltyRule3() uint {
pattern1 := []bool{true, false, true, true, true, false, true, false, false, false, false}
pattern2 := []bool{false, false, false, false, true, false, true, true, true, false, true}
var result uint
for x := 0; x <= qr.dimension-len(pattern1); x++ {
for y := 0; y < qr.dimension; y++ {
pattern1XFound := true
pattern2XFound := true
pattern1YFound := true
pattern2YFound := true
for i := 0; i < len(pattern1); i++ {
iv := qr.Get(x+i, y)
if iv != pattern1[i] {
pattern1XFound = false
}
if iv != pattern2[i] {
pattern2XFound = false
}
iv = qr.Get(y, x+i)
if iv != pattern1[i] {
pattern1YFound = false
}
if iv != pattern2[i] {
pattern2YFound = false
}
}
if pattern1XFound || pattern2XFound {
result += 40
}
if pattern1YFound || pattern2YFound {
result += 40
}
}
}
return result
}
func (qr *qrcode) calcPenaltyRule4() uint {
totalNum := qr.data.Len()
trueCnt := 0
for i := 0; i < totalNum; i++ {
if qr.data.GetBit(i) {
trueCnt++
}
}
percDark := float64(trueCnt) * 100 / float64(totalNum)
floor := math.Abs(math.Floor(percDark/5) - 10)
ceil := math.Abs(math.Ceil(percDark/5) - 10)
return uint(math.Min(floor, ceil) * 10)
}
func newBarcode(dim int) *qrcode {
res := new(qrcode)
res.dimension = dim
res.data = utils.NewBitList(dim * dim)
return res
}

27
vendor/github.com/boombuler/barcode/qr/unicode.go generated vendored Normal file
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package qr
import (
"errors"
"github.com/boombuler/barcode/utils"
)
func encodeUnicode(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
data := []byte(content)
vi := findSmallestVersionInfo(ecl, byteMode, len(data)*8)
if vi == nil {
return nil, nil, errors.New("To much data to encode")
}
// It's not correct to add the unicode bytes to the result directly but most readers can't handle the
// required ECI header...
res := new(utils.BitList)
res.AddBits(int(byteMode), 4)
res.AddBits(len(content), vi.charCountBits(byteMode))
for _, b := range data {
res.AddByte(b)
}
addPaddingAndTerminator(res, vi)
return res, vi, nil
}

310
vendor/github.com/boombuler/barcode/qr/versioninfo.go generated vendored Normal file
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package qr
import "math"
// ErrorCorrectionLevel indicates the amount of "backup data" stored in the QR code
type ErrorCorrectionLevel byte
const (
// L recovers 7% of data
L ErrorCorrectionLevel = iota
// M recovers 15% of data
M
// Q recovers 25% of data
Q
// H recovers 30% of data
H
)
func (ecl ErrorCorrectionLevel) String() string {
switch ecl {
case L:
return "L"
case M:
return "M"
case Q:
return "Q"
case H:
return "H"
}
return "unknown"
}
type encodingMode byte
const (
numericMode encodingMode = 1
alphaNumericMode encodingMode = 2
byteMode encodingMode = 4
kanjiMode encodingMode = 8
)
type versionInfo struct {
Version byte
Level ErrorCorrectionLevel
ErrorCorrectionCodewordsPerBlock byte
NumberOfBlocksInGroup1 byte
DataCodeWordsPerBlockInGroup1 byte
NumberOfBlocksInGroup2 byte
DataCodeWordsPerBlockInGroup2 byte
}
var versionInfos = []*versionInfo{
&versionInfo{1, L, 7, 1, 19, 0, 0},
&versionInfo{1, M, 10, 1, 16, 0, 0},
&versionInfo{1, Q, 13, 1, 13, 0, 0},
&versionInfo{1, H, 17, 1, 9, 0, 0},
&versionInfo{2, L, 10, 1, 34, 0, 0},
&versionInfo{2, M, 16, 1, 28, 0, 0},
&versionInfo{2, Q, 22, 1, 22, 0, 0},
&versionInfo{2, H, 28, 1, 16, 0, 0},
&versionInfo{3, L, 15, 1, 55, 0, 0},
&versionInfo{3, M, 26, 1, 44, 0, 0},
&versionInfo{3, Q, 18, 2, 17, 0, 0},
&versionInfo{3, H, 22, 2, 13, 0, 0},
&versionInfo{4, L, 20, 1, 80, 0, 0},
&versionInfo{4, M, 18, 2, 32, 0, 0},
&versionInfo{4, Q, 26, 2, 24, 0, 0},
&versionInfo{4, H, 16, 4, 9, 0, 0},
&versionInfo{5, L, 26, 1, 108, 0, 0},
&versionInfo{5, M, 24, 2, 43, 0, 0},
&versionInfo{5, Q, 18, 2, 15, 2, 16},
&versionInfo{5, H, 22, 2, 11, 2, 12},
&versionInfo{6, L, 18, 2, 68, 0, 0},
&versionInfo{6, M, 16, 4, 27, 0, 0},
&versionInfo{6, Q, 24, 4, 19, 0, 0},
&versionInfo{6, H, 28, 4, 15, 0, 0},
&versionInfo{7, L, 20, 2, 78, 0, 0},
&versionInfo{7, M, 18, 4, 31, 0, 0},
&versionInfo{7, Q, 18, 2, 14, 4, 15},
&versionInfo{7, H, 26, 4, 13, 1, 14},
&versionInfo{8, L, 24, 2, 97, 0, 0},
&versionInfo{8, M, 22, 2, 38, 2, 39},
&versionInfo{8, Q, 22, 4, 18, 2, 19},
&versionInfo{8, H, 26, 4, 14, 2, 15},
&versionInfo{9, L, 30, 2, 116, 0, 0},
&versionInfo{9, M, 22, 3, 36, 2, 37},
&versionInfo{9, Q, 20, 4, 16, 4, 17},
&versionInfo{9, H, 24, 4, 12, 4, 13},
&versionInfo{10, L, 18, 2, 68, 2, 69},
&versionInfo{10, M, 26, 4, 43, 1, 44},
&versionInfo{10, Q, 24, 6, 19, 2, 20},
&versionInfo{10, H, 28, 6, 15, 2, 16},
&versionInfo{11, L, 20, 4, 81, 0, 0},
&versionInfo{11, M, 30, 1, 50, 4, 51},
&versionInfo{11, Q, 28, 4, 22, 4, 23},
&versionInfo{11, H, 24, 3, 12, 8, 13},
&versionInfo{12, L, 24, 2, 92, 2, 93},
&versionInfo{12, M, 22, 6, 36, 2, 37},
&versionInfo{12, Q, 26, 4, 20, 6, 21},
&versionInfo{12, H, 28, 7, 14, 4, 15},
&versionInfo{13, L, 26, 4, 107, 0, 0},
&versionInfo{13, M, 22, 8, 37, 1, 38},
&versionInfo{13, Q, 24, 8, 20, 4, 21},
&versionInfo{13, H, 22, 12, 11, 4, 12},
&versionInfo{14, L, 30, 3, 115, 1, 116},
&versionInfo{14, M, 24, 4, 40, 5, 41},
&versionInfo{14, Q, 20, 11, 16, 5, 17},
&versionInfo{14, H, 24, 11, 12, 5, 13},
&versionInfo{15, L, 22, 5, 87, 1, 88},
&versionInfo{15, M, 24, 5, 41, 5, 42},
&versionInfo{15, Q, 30, 5, 24, 7, 25},
&versionInfo{15, H, 24, 11, 12, 7, 13},
&versionInfo{16, L, 24, 5, 98, 1, 99},
&versionInfo{16, M, 28, 7, 45, 3, 46},
&versionInfo{16, Q, 24, 15, 19, 2, 20},
&versionInfo{16, H, 30, 3, 15, 13, 16},
&versionInfo{17, L, 28, 1, 107, 5, 108},
&versionInfo{17, M, 28, 10, 46, 1, 47},
&versionInfo{17, Q, 28, 1, 22, 15, 23},
&versionInfo{17, H, 28, 2, 14, 17, 15},
&versionInfo{18, L, 30, 5, 120, 1, 121},
&versionInfo{18, M, 26, 9, 43, 4, 44},
&versionInfo{18, Q, 28, 17, 22, 1, 23},
&versionInfo{18, H, 28, 2, 14, 19, 15},
&versionInfo{19, L, 28, 3, 113, 4, 114},
&versionInfo{19, M, 26, 3, 44, 11, 45},
&versionInfo{19, Q, 26, 17, 21, 4, 22},
&versionInfo{19, H, 26, 9, 13, 16, 14},
&versionInfo{20, L, 28, 3, 107, 5, 108},
&versionInfo{20, M, 26, 3, 41, 13, 42},
&versionInfo{20, Q, 30, 15, 24, 5, 25},
&versionInfo{20, H, 28, 15, 15, 10, 16},
&versionInfo{21, L, 28, 4, 116, 4, 117},
&versionInfo{21, M, 26, 17, 42, 0, 0},
&versionInfo{21, Q, 28, 17, 22, 6, 23},
&versionInfo{21, H, 30, 19, 16, 6, 17},
&versionInfo{22, L, 28, 2, 111, 7, 112},
&versionInfo{22, M, 28, 17, 46, 0, 0},
&versionInfo{22, Q, 30, 7, 24, 16, 25},
&versionInfo{22, H, 24, 34, 13, 0, 0},
&versionInfo{23, L, 30, 4, 121, 5, 122},
&versionInfo{23, M, 28, 4, 47, 14, 48},
&versionInfo{23, Q, 30, 11, 24, 14, 25},
&versionInfo{23, H, 30, 16, 15, 14, 16},
&versionInfo{24, L, 30, 6, 117, 4, 118},
&versionInfo{24, M, 28, 6, 45, 14, 46},
&versionInfo{24, Q, 30, 11, 24, 16, 25},
&versionInfo{24, H, 30, 30, 16, 2, 17},
&versionInfo{25, L, 26, 8, 106, 4, 107},
&versionInfo{25, M, 28, 8, 47, 13, 48},
&versionInfo{25, Q, 30, 7, 24, 22, 25},
&versionInfo{25, H, 30, 22, 15, 13, 16},
&versionInfo{26, L, 28, 10, 114, 2, 115},
&versionInfo{26, M, 28, 19, 46, 4, 47},
&versionInfo{26, Q, 28, 28, 22, 6, 23},
&versionInfo{26, H, 30, 33, 16, 4, 17},
&versionInfo{27, L, 30, 8, 122, 4, 123},
&versionInfo{27, M, 28, 22, 45, 3, 46},
&versionInfo{27, Q, 30, 8, 23, 26, 24},
&versionInfo{27, H, 30, 12, 15, 28, 16},
&versionInfo{28, L, 30, 3, 117, 10, 118},
&versionInfo{28, M, 28, 3, 45, 23, 46},
&versionInfo{28, Q, 30, 4, 24, 31, 25},
&versionInfo{28, H, 30, 11, 15, 31, 16},
&versionInfo{29, L, 30, 7, 116, 7, 117},
&versionInfo{29, M, 28, 21, 45, 7, 46},
&versionInfo{29, Q, 30, 1, 23, 37, 24},
&versionInfo{29, H, 30, 19, 15, 26, 16},
&versionInfo{30, L, 30, 5, 115, 10, 116},
&versionInfo{30, M, 28, 19, 47, 10, 48},
&versionInfo{30, Q, 30, 15, 24, 25, 25},
&versionInfo{30, H, 30, 23, 15, 25, 16},
&versionInfo{31, L, 30, 13, 115, 3, 116},
&versionInfo{31, M, 28, 2, 46, 29, 47},
&versionInfo{31, Q, 30, 42, 24, 1, 25},
&versionInfo{31, H, 30, 23, 15, 28, 16},
&versionInfo{32, L, 30, 17, 115, 0, 0},
&versionInfo{32, M, 28, 10, 46, 23, 47},
&versionInfo{32, Q, 30, 10, 24, 35, 25},
&versionInfo{32, H, 30, 19, 15, 35, 16},
&versionInfo{33, L, 30, 17, 115, 1, 116},
&versionInfo{33, M, 28, 14, 46, 21, 47},
&versionInfo{33, Q, 30, 29, 24, 19, 25},
&versionInfo{33, H, 30, 11, 15, 46, 16},
&versionInfo{34, L, 30, 13, 115, 6, 116},
&versionInfo{34, M, 28, 14, 46, 23, 47},
&versionInfo{34, Q, 30, 44, 24, 7, 25},
&versionInfo{34, H, 30, 59, 16, 1, 17},
&versionInfo{35, L, 30, 12, 121, 7, 122},
&versionInfo{35, M, 28, 12, 47, 26, 48},
&versionInfo{35, Q, 30, 39, 24, 14, 25},
&versionInfo{35, H, 30, 22, 15, 41, 16},
&versionInfo{36, L, 30, 6, 121, 14, 122},
&versionInfo{36, M, 28, 6, 47, 34, 48},
&versionInfo{36, Q, 30, 46, 24, 10, 25},
&versionInfo{36, H, 30, 2, 15, 64, 16},
&versionInfo{37, L, 30, 17, 122, 4, 123},
&versionInfo{37, M, 28, 29, 46, 14, 47},
&versionInfo{37, Q, 30, 49, 24, 10, 25},
&versionInfo{37, H, 30, 24, 15, 46, 16},
&versionInfo{38, L, 30, 4, 122, 18, 123},
&versionInfo{38, M, 28, 13, 46, 32, 47},
&versionInfo{38, Q, 30, 48, 24, 14, 25},
&versionInfo{38, H, 30, 42, 15, 32, 16},
&versionInfo{39, L, 30, 20, 117, 4, 118},
&versionInfo{39, M, 28, 40, 47, 7, 48},
&versionInfo{39, Q, 30, 43, 24, 22, 25},
&versionInfo{39, H, 30, 10, 15, 67, 16},
&versionInfo{40, L, 30, 19, 118, 6, 119},
&versionInfo{40, M, 28, 18, 47, 31, 48},
&versionInfo{40, Q, 30, 34, 24, 34, 25},
&versionInfo{40, H, 30, 20, 15, 61, 16},
}
func (vi *versionInfo) totalDataBytes() int {
g1Data := int(vi.NumberOfBlocksInGroup1) * int(vi.DataCodeWordsPerBlockInGroup1)
g2Data := int(vi.NumberOfBlocksInGroup2) * int(vi.DataCodeWordsPerBlockInGroup2)
return (g1Data + g2Data)
}
func (vi *versionInfo) charCountBits(m encodingMode) byte {
switch m {
case numericMode:
if vi.Version < 10 {
return 10
} else if vi.Version < 27 {
return 12
}
return 14
case alphaNumericMode:
if vi.Version < 10 {
return 9
} else if vi.Version < 27 {
return 11
}
return 13
case byteMode:
if vi.Version < 10 {
return 8
}
return 16
case kanjiMode:
if vi.Version < 10 {
return 8
} else if vi.Version < 27 {
return 10
}
return 12
default:
return 0
}
}
func (vi *versionInfo) modulWidth() int {
return ((int(vi.Version) - 1) * 4) + 21
}
func (vi *versionInfo) alignmentPatternPlacements() []int {
if vi.Version == 1 {
return make([]int, 0)
}
first := 6
last := vi.modulWidth() - 7
space := float64(last - first)
count := int(math.Ceil(space/28)) + 1
result := make([]int, count)
result[0] = first
result[len(result)-1] = last
if count > 2 {
step := int(math.Ceil(float64(last-first) / float64(count-1)))
if step%2 == 1 {
frac := float64(last-first) / float64(count-1)
_, x := math.Modf(frac)
if x >= 0.5 {
frac = math.Ceil(frac)
} else {
frac = math.Floor(frac)
}
if int(frac)%2 == 0 {
step--
} else {
step++
}
}
for i := 1; i <= count-2; i++ {
result[i] = last - (step * (count - 1 - i))
}
}
return result
}
func findSmallestVersionInfo(ecl ErrorCorrectionLevel, mode encodingMode, dataBits int) *versionInfo {
dataBits = dataBits + 4 // mode indicator
for _, vi := range versionInfos {
if vi.Level == ecl {
if (vi.totalDataBytes() * 8) >= (dataBits + int(vi.charCountBits(mode))) {
return vi
}
}
}
return nil
}

115
vendor/github.com/boombuler/barcode/scaledbarcode.go generated vendored Normal file
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@ -0,0 +1,115 @@
package barcode
import (
"errors"
"fmt"
"image"
"image/color"
"math"
)
type wrapFunc func(x, y int) color.Color
type scaledBarcode struct {
wrapped Barcode
wrapperFunc wrapFunc
rect image.Rectangle
}
func (bc *scaledBarcode) Content() string {
return bc.wrapped.Content()
}
func (bc *scaledBarcode) Metadata() Metadata {
return bc.wrapped.Metadata()
}
func (bc *scaledBarcode) ColorModel() color.Model {
return bc.wrapped.ColorModel()
}
func (bc *scaledBarcode) Bounds() image.Rectangle {
return bc.rect
}
func (bc *scaledBarcode) At(x, y int) color.Color {
return bc.wrapperFunc(x, y)
}
func (bc *scaledBarcode) CheckSum() int {
return bc.wrapped.CheckSum()
}
// Scale returns a resized barcode with the given width and height.
func Scale(bc Barcode, width, height int) (Barcode, error) {
switch bc.Metadata().Dimensions {
case 1:
return scale1DCode(bc, width, height)
case 2:
return scale2DCode(bc, width, height)
}
return nil, errors.New("unsupported barcode format")
}
func scale2DCode(bc Barcode, width, height int) (Barcode, error) {
orgBounds := bc.Bounds()
orgWidth := orgBounds.Max.X - orgBounds.Min.X
orgHeight := orgBounds.Max.Y - orgBounds.Min.Y
factor := int(math.Min(float64(width)/float64(orgWidth), float64(height)/float64(orgHeight)))
if factor <= 0 {
return nil, fmt.Errorf("can not scale barcode to an image smaller then %dx%d", orgWidth, orgHeight)
}
offsetX := (width - (orgWidth * factor)) / 2
offsetY := (height - (orgHeight * factor)) / 2
wrap := func(x, y int) color.Color {
if x < offsetX || y < offsetY {
return color.White
}
x = (x - offsetX) / factor
y = (y - offsetY) / factor
if x >= orgWidth || y >= orgHeight {
return color.White
}
return bc.At(x, y)
}
return &scaledBarcode{
bc,
wrap,
image.Rect(0, 0, width, height),
}, nil
}
func scale1DCode(bc Barcode, width, height int) (Barcode, error) {
orgBounds := bc.Bounds()
orgWidth := orgBounds.Max.X - orgBounds.Min.X
factor := int(float64(width) / float64(orgWidth))
if factor <= 0 {
return nil, fmt.Errorf("can not scale barcode to an image smaller then %dx1", orgWidth)
}
offsetX := (width - (orgWidth * factor)) / 2
wrap := func(x, y int) color.Color {
if x < offsetX {
return color.White
}
x = (x - offsetX) / factor
if x >= orgWidth {
return color.White
}
return bc.At(x, 0)
}
return &scaledBarcode{
bc,
wrap,
image.Rect(0, 0, width, height),
}, nil
}

48
vendor/github.com/boombuler/barcode/utils/base1dcode.go generated vendored Normal file
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@ -0,0 +1,48 @@
// Package utils contain some utilities which are needed to create barcodes
package utils
import (
"image"
"image/color"
"github.com/boombuler/barcode"
)
type base1DCode struct {
*BitList
kind string
content string
checksum int
}
func (c *base1DCode) Content() string {
return c.content
}
func (c *base1DCode) Metadata() barcode.Metadata {
return barcode.Metadata{c.kind, 1}
}
func (c *base1DCode) ColorModel() color.Model {
return color.Gray16Model
}
func (c *base1DCode) Bounds() image.Rectangle {
return image.Rect(0, 0, c.Len(), 1)
}
func (c *base1DCode) At(x, y int) color.Color {
if c.GetBit(x) {
return color.Black
}
return color.White
}
func (c *base1DCode) CheckSum() int {
return c.checksum
}
// New1DCode creates a new 1D barcode where the bars are represented by the bits in the bars BitList
func New1DCode(codeKind, content string, bars *BitList, checksum int) barcode.Barcode {
return &base1DCode{bars, codeKind, content, checksum}
}

119
vendor/github.com/boombuler/barcode/utils/bitlist.go generated vendored Normal file
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@ -0,0 +1,119 @@
package utils
// BitList is a list that contains bits
type BitList struct {
count int
data []int32
}
// NewBitList returns a new BitList with the given length
// all bits are initialize with false
func NewBitList(capacity int) *BitList {
bl := new(BitList)
bl.count = capacity
x := 0
if capacity%32 != 0 {
x = 1
}
bl.data = make([]int32, capacity/32+x)
return bl
}
// Len returns the number of contained bits
func (bl *BitList) Len() int {
return bl.count
}
func (bl *BitList) grow() {
growBy := len(bl.data)
if growBy < 128 {
growBy = 128
} else if growBy >= 1024 {
growBy = 1024
}
nd := make([]int32, len(bl.data)+growBy)
copy(nd, bl.data)
bl.data = nd
}
// AddBit appends the given bits to the end of the list
func (bl *BitList) AddBit(bits ...bool) {
for _, bit := range bits {
itmIndex := bl.count / 32
for itmIndex >= len(bl.data) {
bl.grow()
}
bl.SetBit(bl.count, bit)
bl.count++
}
}
// SetBit sets the bit at the given index to the given value
func (bl *BitList) SetBit(index int, value bool) {
itmIndex := index / 32
itmBitShift := 31 - (index % 32)
if value {
bl.data[itmIndex] = bl.data[itmIndex] | 1<<uint(itmBitShift)
} else {
bl.data[itmIndex] = bl.data[itmIndex] & ^(1 << uint(itmBitShift))
}
}
// GetBit returns the bit at the given index
func (bl *BitList) GetBit(index int) bool {
itmIndex := index / 32
itmBitShift := 31 - (index % 32)
return ((bl.data[itmIndex] >> uint(itmBitShift)) & 1) == 1
}
// AddByte appends all 8 bits of the given byte to the end of the list
func (bl *BitList) AddByte(b byte) {
for i := 7; i >= 0; i-- {
bl.AddBit(((b >> uint(i)) & 1) == 1)
}
}
// AddBits appends the last (LSB) 'count' bits of 'b' the the end of the list
func (bl *BitList) AddBits(b int, count byte) {
for i := int(count) - 1; i >= 0; i-- {
bl.AddBit(((b >> uint(i)) & 1) == 1)
}
}
// GetBytes returns all bits of the BitList as a []byte
func (bl *BitList) GetBytes() []byte {
len := bl.count >> 3
if (bl.count % 8) != 0 {
len++
}
result := make([]byte, len)
for i := 0; i < len; i++ {
shift := (3 - (i % 4)) * 8
result[i] = (byte)((bl.data[i/4] >> uint(shift)) & 0xFF)
}
return result
}
// IterateBytes iterates through all bytes contained in the BitList
func (bl *BitList) IterateBytes() <-chan byte {
res := make(chan byte)
go func() {
c := bl.count
shift := 24
i := 0
for c > 0 {
res <- byte((bl.data[i] >> uint(shift)) & 0xFF)
shift -= 8
if shift < 0 {
shift = 24
i++
}
c -= 8
}
close(res)
}()
return res
}

65
vendor/github.com/boombuler/barcode/utils/galoisfield.go generated vendored Normal file
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@ -0,0 +1,65 @@
package utils
// GaloisField encapsulates galois field arithmetics
type GaloisField struct {
Size int
Base int
ALogTbl []int
LogTbl []int
}
// NewGaloisField creates a new galois field
func NewGaloisField(pp, fieldSize, b int) *GaloisField {
result := new(GaloisField)
result.Size = fieldSize
result.Base = b
result.ALogTbl = make([]int, fieldSize)
result.LogTbl = make([]int, fieldSize)
x := 1
for i := 0; i < fieldSize; i++ {
result.ALogTbl[i] = x
x = x * 2
if x >= fieldSize {
x = (x ^ pp) & (fieldSize - 1)
}
}
for i := 0; i < fieldSize; i++ {
result.LogTbl[result.ALogTbl[i]] = int(i)
}
return result
}
func (gf *GaloisField) Zero() *GFPoly {
return NewGFPoly(gf, []int{0})
}
// AddOrSub add or substract two numbers
func (gf *GaloisField) AddOrSub(a, b int) int {
return a ^ b
}
// Multiply multiplys two numbers
func (gf *GaloisField) Multiply(a, b int) int {
if a == 0 || b == 0 {
return 0
}
return gf.ALogTbl[(gf.LogTbl[a]+gf.LogTbl[b])%(gf.Size-1)]
}
// Divide divides two numbers
func (gf *GaloisField) Divide(a, b int) int {
if b == 0 {
panic("divide by zero")
} else if a == 0 {
return 0
}
return gf.ALogTbl[(gf.LogTbl[a]-gf.LogTbl[b])%(gf.Size-1)]
}
func (gf *GaloisField) Invers(num int) int {
return gf.ALogTbl[(gf.Size-1)-gf.LogTbl[num]]
}

103
vendor/github.com/boombuler/barcode/utils/gfpoly.go generated vendored Normal file
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package utils
type GFPoly struct {
gf *GaloisField
Coefficients []int
}
func (gp *GFPoly) Degree() int {
return len(gp.Coefficients) - 1
}
func (gp *GFPoly) Zero() bool {
return gp.Coefficients[0] == 0
}
// GetCoefficient returns the coefficient of x ^ degree
func (gp *GFPoly) GetCoefficient(degree int) int {
return gp.Coefficients[gp.Degree()-degree]
}
func (gp *GFPoly) AddOrSubstract(other *GFPoly) *GFPoly {
if gp.Zero() {
return other
} else if other.Zero() {
return gp
}
smallCoeff := gp.Coefficients
largeCoeff := other.Coefficients
if len(smallCoeff) > len(largeCoeff) {
largeCoeff, smallCoeff = smallCoeff, largeCoeff
}
sumDiff := make([]int, len(largeCoeff))
lenDiff := len(largeCoeff) - len(smallCoeff)
copy(sumDiff, largeCoeff[:lenDiff])
for i := lenDiff; i < len(largeCoeff); i++ {
sumDiff[i] = int(gp.gf.AddOrSub(int(smallCoeff[i-lenDiff]), int(largeCoeff[i])))
}
return NewGFPoly(gp.gf, sumDiff)
}
func (gp *GFPoly) MultByMonominal(degree int, coeff int) *GFPoly {
if coeff == 0 {
return gp.gf.Zero()
}
size := len(gp.Coefficients)
result := make([]int, size+degree)
for i := 0; i < size; i++ {
result[i] = int(gp.gf.Multiply(int(gp.Coefficients[i]), int(coeff)))
}
return NewGFPoly(gp.gf, result)
}
func (gp *GFPoly) Multiply(other *GFPoly) *GFPoly {
if gp.Zero() || other.Zero() {
return gp.gf.Zero()
}
aCoeff := gp.Coefficients
aLen := len(aCoeff)
bCoeff := other.Coefficients
bLen := len(bCoeff)
product := make([]int, aLen+bLen-1)
for i := 0; i < aLen; i++ {
ac := int(aCoeff[i])
for j := 0; j < bLen; j++ {
bc := int(bCoeff[j])
product[i+j] = int(gp.gf.AddOrSub(int(product[i+j]), gp.gf.Multiply(ac, bc)))
}
}
return NewGFPoly(gp.gf, product)
}
func (gp *GFPoly) Divide(other *GFPoly) (quotient *GFPoly, remainder *GFPoly) {
quotient = gp.gf.Zero()
remainder = gp
fld := gp.gf
denomLeadTerm := other.GetCoefficient(other.Degree())
inversDenomLeadTerm := fld.Invers(int(denomLeadTerm))
for remainder.Degree() >= other.Degree() && !remainder.Zero() {
degreeDiff := remainder.Degree() - other.Degree()
scale := int(fld.Multiply(int(remainder.GetCoefficient(remainder.Degree())), inversDenomLeadTerm))
term := other.MultByMonominal(degreeDiff, scale)
itQuot := NewMonominalPoly(fld, degreeDiff, scale)
quotient = quotient.AddOrSubstract(itQuot)
remainder = remainder.AddOrSubstract(term)
}
return
}
func NewMonominalPoly(field *GaloisField, degree int, coeff int) *GFPoly {
if coeff == 0 {
return field.Zero()
}
result := make([]int, degree+1)
result[0] = coeff
return NewGFPoly(field, result)
}
func NewGFPoly(field *GaloisField, coefficients []int) *GFPoly {
for len(coefficients) > 1 && coefficients[0] == 0 {
coefficients = coefficients[1:]
}
return &GFPoly{field, coefficients}
}

44
vendor/github.com/boombuler/barcode/utils/reedsolomon.go generated vendored Normal file
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@ -0,0 +1,44 @@
package utils
import (
"sync"
)
type ReedSolomonEncoder struct {
gf *GaloisField
polynomes []*GFPoly
m *sync.Mutex
}
func NewReedSolomonEncoder(gf *GaloisField) *ReedSolomonEncoder {
return &ReedSolomonEncoder{
gf, []*GFPoly{NewGFPoly(gf, []int{1})}, new(sync.Mutex),
}
}
func (rs *ReedSolomonEncoder) getPolynomial(degree int) *GFPoly {
rs.m.Lock()
defer rs.m.Unlock()
if degree >= len(rs.polynomes) {
last := rs.polynomes[len(rs.polynomes)-1]
for d := len(rs.polynomes); d <= degree; d++ {
next := last.Multiply(NewGFPoly(rs.gf, []int{1, rs.gf.ALogTbl[d-1+rs.gf.Base]}))
rs.polynomes = append(rs.polynomes, next)
last = next
}
}
return rs.polynomes[degree]
}
func (rs *ReedSolomonEncoder) Encode(data []int, eccCount int) []int {
generator := rs.getPolynomial(eccCount)
info := NewGFPoly(rs.gf, data)
info = info.MultByMonominal(eccCount, 1)
_, remainder := info.Divide(generator)
result := make([]int, eccCount)
numZero := int(eccCount) - len(remainder.Coefficients)
copy(result[numZero:], remainder.Coefficients)
return result
}

19
vendor/github.com/boombuler/barcode/utils/runeint.go generated vendored Normal file
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@ -0,0 +1,19 @@
package utils
// RuneToInt converts a rune between '0' and '9' to an integer between 0 and 9
// If the rune is outside of this range -1 is returned.
func RuneToInt(r rune) int {
if r >= '0' && r <= '9' {
return int(r - '0')
}
return -1
}
// IntToRune converts a digit 0 - 9 to the rune '0' - '9'. If the given int is outside
// of this range 'F' is returned!
func IntToRune(i int) rune {
if i >= 0 && i <= 9 {
return rune(i + '0')
}
return 'F'
}

23
vendor/github.com/fatih/structs/.gitignore generated vendored Normal file
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@ -0,0 +1,23 @@
# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test

11
vendor/github.com/fatih/structs/.travis.yml generated vendored Normal file
View file

@ -0,0 +1,11 @@
language: go
go:
- 1.6
- tip
sudo: false
before_install:
- go get github.com/axw/gocov/gocov
- go get github.com/mattn/goveralls
- if ! go get github.com/golang/tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
script:
- $HOME/gopath/bin/goveralls -service=travis-ci

21
vendor/github.com/fatih/structs/LICENSE generated vendored Normal file
View file

@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright (c) 2014 Fatih Arslan
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Structs [![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/fatih/structs) [![Build Status](http://img.shields.io/travis/fatih/structs.svg?style=flat-square)](https://travis-ci.org/fatih/structs) [![Coverage Status](http://img.shields.io/coveralls/fatih/structs.svg?style=flat-square)](https://coveralls.io/r/fatih/structs)
Structs contains various utilities to work with Go (Golang) structs. It was
initially used by me to convert a struct into a `map[string]interface{}`. With
time I've added other utilities for structs. It's basically a high level
package based on primitives from the reflect package. Feel free to add new
functions or improve the existing code.
## Install
```bash
go get github.com/fatih/structs
```
## Usage and Examples
Just like the standard lib `strings`, `bytes` and co packages, `structs` has
many global functions to manipulate or organize your struct data. Lets define
and declare a struct:
```go
type Server struct {
Name string `json:"name,omitempty"`
ID int
Enabled bool
users []string // not exported
http.Server // embedded
}
server := &Server{
Name: "gopher",
ID: 123456,
Enabled: true,
}
```
```go
// Convert a struct to a map[string]interface{}
// => {"Name":"gopher", "ID":123456, "Enabled":true}
m := structs.Map(server)
// Convert the values of a struct to a []interface{}
// => ["gopher", 123456, true]
v := structs.Values(server)
// Convert the names of a struct to a []string
// (see "Names methods" for more info about fields)
n := structs.Names(server)
// Convert the values of a struct to a []*Field
// (see "Field methods" for more info about fields)
f := structs.Fields(server)
// Return the struct name => "Server"
n := structs.Name(server)
// Check if any field of a struct is initialized or not.
h := structs.HasZero(server)
// Check if all fields of a struct is initialized or not.
z := structs.IsZero(server)
// Check if server is a struct or a pointer to struct
i := structs.IsStruct(server)
```
### Struct methods
The structs functions can be also used as independent methods by creating a new
`*structs.Struct`. This is handy if you want to have more control over the
structs (such as retrieving a single Field).
```go
// Create a new struct type:
s := structs.New(server)
m := s.Map() // Get a map[string]interface{}
v := s.Values() // Get a []interface{}
f := s.Fields() // Get a []*Field
n := s.Names() // Get a []string
f := s.Field(name) // Get a *Field based on the given field name
f, ok := s.FieldOk(name) // Get a *Field based on the given field name
n := s.Name() // Get the struct name
h := s.HasZero() // Check if any field is initialized
z := s.IsZero() // Check if all fields are initialized
```
### Field methods
We can easily examine a single Field for more detail. Below you can see how we
get and interact with various field methods:
```go
s := structs.New(server)
// Get the Field struct for the "Name" field
name := s.Field("Name")
// Get the underlying value, value => "gopher"
value := name.Value().(string)
// Set the field's value
name.Set("another gopher")
// Get the field's kind, kind => "string"
name.Kind()
// Check if the field is exported or not
if name.IsExported() {
fmt.Println("Name field is exported")
}
// Check if the value is a zero value, such as "" for string, 0 for int
if !name.IsZero() {
fmt.Println("Name is initialized")
}
// Check if the field is an anonymous (embedded) field
if !name.IsEmbedded() {
fmt.Println("Name is not an embedded field")
}
// Get the Field's tag value for tag name "json", tag value => "name,omitempty"
tagValue := name.Tag("json")
```
Nested structs are supported too:
```go
addrField := s.Field("Server").Field("Addr")
// Get the value for addr
a := addrField.Value().(string)
// Or get all fields
httpServer := s.Field("Server").Fields()
```
We can also get a slice of Fields from the Struct type to iterate over all
fields. This is handy if you wish to examine all fields:
```go
s := structs.New(server)
for _, f := range s.Fields() {
fmt.Printf("field name: %+v\n", f.Name())
if f.IsExported() {
fmt.Printf("value : %+v\n", f.Value())
fmt.Printf("is zero : %+v\n", f.IsZero())
}
}
```
## Credits
* [Fatih Arslan](https://github.com/fatih)
* [Cihangir Savas](https://github.com/cihangir)
## License
The MIT License (MIT) - see LICENSE.md for more details

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package structs
import (
"errors"
"fmt"
"reflect"
)
var (
errNotExported = errors.New("field is not exported")
errNotSettable = errors.New("field is not settable")
)
// Field represents a single struct field that encapsulates high level
// functions around the field.
type Field struct {
value reflect.Value
field reflect.StructField
defaultTag string
}
// Tag returns the value associated with key in the tag string. If there is no
// such key in the tag, Tag returns the empty string.
func (f *Field) Tag(key string) string {
return f.field.Tag.Get(key)
}
// Value returns the underlying value of the field. It panics if the field
// is not exported.
func (f *Field) Value() interface{} {
return f.value.Interface()
}
// IsEmbedded returns true if the given field is an anonymous field (embedded)
func (f *Field) IsEmbedded() bool {
return f.field.Anonymous
}
// IsExported returns true if the given field is exported.
func (f *Field) IsExported() bool {
return f.field.PkgPath == ""
}
// IsZero returns true if the given field is not initialized (has a zero value).
// It panics if the field is not exported.
func (f *Field) IsZero() bool {
zero := reflect.Zero(f.value.Type()).Interface()
current := f.Value()
return reflect.DeepEqual(current, zero)
}
// Name returns the name of the given field
func (f *Field) Name() string {
return f.field.Name
}
// Kind returns the fields kind, such as "string", "map", "bool", etc ..
func (f *Field) Kind() reflect.Kind {
return f.value.Kind()
}
// Set sets the field to given value v. It returns an error if the field is not
// settable (not addressable or not exported) or if the given value's type
// doesn't match the fields type.
func (f *Field) Set(val interface{}) error {
// we can't set unexported fields, so be sure this field is exported
if !f.IsExported() {
return errNotExported
}
// do we get here? not sure...
if !f.value.CanSet() {
return errNotSettable
}
given := reflect.ValueOf(val)
if f.value.Kind() != given.Kind() {
return fmt.Errorf("wrong kind. got: %s want: %s", given.Kind(), f.value.Kind())
}
f.value.Set(given)
return nil
}
// Zero sets the field to its zero value. It returns an error if the field is not
// settable (not addressable or not exported).
func (f *Field) Zero() error {
zero := reflect.Zero(f.value.Type()).Interface()
return f.Set(zero)
}
// Fields returns a slice of Fields. This is particular handy to get the fields
// of a nested struct . A struct tag with the content of "-" ignores the
// checking of that particular field. Example:
//
// // Field is ignored by this package.
// Field *http.Request `structs:"-"`
//
// It panics if field is not exported or if field's kind is not struct
func (f *Field) Fields() []*Field {
return getFields(f.value, f.defaultTag)
}
// Field returns the field from a nested struct. It panics if the nested struct
// is not exported or if the field was not found.
func (f *Field) Field(name string) *Field {
field, ok := f.FieldOk(name)
if !ok {
panic("field not found")
}
return field
}
// FieldOk returns the field from a nested struct. The boolean returns whether
// the field was found (true) or not (false).
func (f *Field) FieldOk(name string) (*Field, bool) {
v := strctVal(f.value.Interface())
t := v.Type()
field, ok := t.FieldByName(name)
if !ok {
return nil, false
}
return &Field{
field: field,
value: v.FieldByName(name),
}, true
}

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// Package structs contains various utilities functions to work with structs.
package structs
import (
"fmt"
"reflect"
)
var (
// DefaultTagName is the default tag name for struct fields which provides
// a more granular to tweak certain structs. Lookup the necessary functions
// for more info.
DefaultTagName = "structs" // struct's field default tag name
)
// Struct encapsulates a struct type to provide several high level functions
// around the struct.
type Struct struct {
raw interface{}
value reflect.Value
TagName string
}
// New returns a new *Struct with the struct s. It panics if the s's kind is
// not struct.
func New(s interface{}) *Struct {
return &Struct{
raw: s,
value: strctVal(s),
TagName: DefaultTagName,
}
}
// Map converts the given struct to a map[string]interface{}, where the keys
// of the map are the field names and the values of the map the associated
// values of the fields. The default key string is the struct field name but
// can be changed in the struct field's tag value. The "structs" key in the
// struct's field tag value is the key name. Example:
//
// // Field appears in map as key "myName".
// Name string `structs:"myName"`
//
// A tag value with the content of "-" ignores that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A tag value with the content of "string" uses the stringer to get the value. Example:
//
// // The value will be output of Animal's String() func.
// // Map will panic if Animal does not implement String().
// Field *Animal `structs:"field,string"`
//
// A tag value with the option of "flatten" used in a struct field is to flatten its fields
// in the output map. Example:
//
// // The FieldStruct's fields will be flattened into the output map.
// FieldStruct time.Time `structs:"flatten"`
//
// A tag value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// A tag value with the option of "omitempty" ignores that particular field if
// the field value is empty. Example:
//
// // Field appears in map as key "myName", but the field is
// // skipped if empty.
// Field string `structs:"myName,omitempty"`
//
// // Field appears in map as key "Field" (the default), but
// // the field is skipped if empty.
// Field string `structs:",omitempty"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected.
func (s *Struct) Map() map[string]interface{} {
out := make(map[string]interface{})
s.FillMap(out)
return out
}
// FillMap is the same as Map. Instead of returning the output, it fills the
// given map.
func (s *Struct) FillMap(out map[string]interface{}) {
if out == nil {
return
}
fields := s.structFields()
for _, field := range fields {
name := field.Name
val := s.value.FieldByName(name)
isSubStruct := false
var finalVal interface{}
tagName, tagOpts := parseTag(field.Tag.Get(s.TagName))
if tagName != "" {
name = tagName
}
// if the value is a zero value and the field is marked as omitempty do
// not include
if tagOpts.Has("omitempty") {
zero := reflect.Zero(val.Type()).Interface()
current := val.Interface()
if reflect.DeepEqual(current, zero) {
continue
}
}
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
// look out for embedded structs, and convert them to a
// map[string]interface{} too
n := New(val.Interface())
n.TagName = s.TagName
m := n.Map()
isSubStruct = true
if len(m) == 0 {
finalVal = val.Interface()
} else {
finalVal = m
}
} else {
finalVal = val.Interface()
}
if tagOpts.Has("string") {
s, ok := val.Interface().(fmt.Stringer)
if ok {
out[name] = s.String()
}
continue
}
if isSubStruct && (tagOpts.Has("flatten")) {
for k := range finalVal.(map[string]interface{}) {
out[k] = finalVal.(map[string]interface{})[k]
}
} else {
out[name] = finalVal
}
}
}
// Values converts the given s struct's field values to a []interface{}. A
// struct tag with the content of "-" ignores the that particular field.
// Example:
//
// // Field is ignored by this package.
// Field int `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Fields is not processed further by this package.
// Field time.Time `structs:",omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// A tag value with the option of "omitempty" ignores that particular field and
// is not added to the values if the field value is empty. Example:
//
// // Field is skipped if empty
// Field string `structs:",omitempty"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected.
func (s *Struct) Values() []interface{} {
fields := s.structFields()
var t []interface{}
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
// if the value is a zero value and the field is marked as omitempty do
// not include
if tagOpts.Has("omitempty") {
zero := reflect.Zero(val.Type()).Interface()
current := val.Interface()
if reflect.DeepEqual(current, zero) {
continue
}
}
if tagOpts.Has("string") {
s, ok := val.Interface().(fmt.Stringer)
if ok {
t = append(t, s.String())
}
continue
}
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
// look out for embedded structs, and convert them to a
// []interface{} to be added to the final values slice
for _, embeddedVal := range Values(val.Interface()) {
t = append(t, embeddedVal)
}
} else {
t = append(t, val.Interface())
}
}
return t
}
// Fields returns a slice of Fields. A struct tag with the content of "-"
// ignores the checking of that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// It panics if s's kind is not struct.
func (s *Struct) Fields() []*Field {
return getFields(s.value, s.TagName)
}
// Names returns a slice of field names. A struct tag with the content of "-"
// ignores the checking of that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// It panics if s's kind is not struct.
func (s *Struct) Names() []string {
fields := getFields(s.value, s.TagName)
names := make([]string, len(fields))
for i, field := range fields {
names[i] = field.Name()
}
return names
}
func getFields(v reflect.Value, tagName string) []*Field {
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
t := v.Type()
var fields []*Field
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if tag := field.Tag.Get(tagName); tag == "-" {
continue
}
f := &Field{
field: field,
value: v.FieldByName(field.Name),
}
fields = append(fields, f)
}
return fields
}
// Field returns a new Field struct that provides several high level functions
// around a single struct field entity. It panics if the field is not found.
func (s *Struct) Field(name string) *Field {
f, ok := s.FieldOk(name)
if !ok {
panic("field not found")
}
return f
}
// FieldOk returns a new Field struct that provides several high level functions
// around a single struct field entity. The boolean returns true if the field
// was found.
func (s *Struct) FieldOk(name string) (*Field, bool) {
t := s.value.Type()
field, ok := t.FieldByName(name)
if !ok {
return nil, false
}
return &Field{
field: field,
value: s.value.FieldByName(name),
defaultTag: s.TagName,
}, true
}
// IsZero returns true if all fields in a struct is a zero value (not
// initialized) A struct tag with the content of "-" ignores the checking of
// that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected. It panics if s's kind is not struct.
func (s *Struct) IsZero() bool {
fields := s.structFields()
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
ok := IsZero(val.Interface())
if !ok {
return false
}
continue
}
// zero value of the given field, such as "" for string, 0 for int
zero := reflect.Zero(val.Type()).Interface()
// current value of the given field
current := val.Interface()
if !reflect.DeepEqual(current, zero) {
return false
}
}
return true
}
// HasZero returns true if a field in a struct is not initialized (zero value).
// A struct tag with the content of "-" ignores the checking of that particular
// field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected. It panics if s's kind is not struct.
func (s *Struct) HasZero() bool {
fields := s.structFields()
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
ok := HasZero(val.Interface())
if ok {
return true
}
continue
}
// zero value of the given field, such as "" for string, 0 for int
zero := reflect.Zero(val.Type()).Interface()
// current value of the given field
current := val.Interface()
if reflect.DeepEqual(current, zero) {
return true
}
}
return false
}
// Name returns the structs's type name within its package. For more info refer
// to Name() function.
func (s *Struct) Name() string {
return s.value.Type().Name()
}
// structFields returns the exported struct fields for a given s struct. This
// is a convenient helper method to avoid duplicate code in some of the
// functions.
func (s *Struct) structFields() []reflect.StructField {
t := s.value.Type()
var f []reflect.StructField
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
// we can't access the value of unexported fields
if field.PkgPath != "" {
continue
}
// don't check if it's omitted
if tag := field.Tag.Get(s.TagName); tag == "-" {
continue
}
f = append(f, field)
}
return f
}
func strctVal(s interface{}) reflect.Value {
v := reflect.ValueOf(s)
// if pointer get the underlying element≤
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
panic("not struct")
}
return v
}
// Map converts the given struct to a map[string]interface{}. For more info
// refer to Struct types Map() method. It panics if s's kind is not struct.
func Map(s interface{}) map[string]interface{} {
return New(s).Map()
}
// FillMap is the same as Map. Instead of returning the output, it fills the
// given map.
func FillMap(s interface{}, out map[string]interface{}) {
New(s).FillMap(out)
}
// Values converts the given struct to a []interface{}. For more info refer to
// Struct types Values() method. It panics if s's kind is not struct.
func Values(s interface{}) []interface{} {
return New(s).Values()
}
// Fields returns a slice of *Field. For more info refer to Struct types
// Fields() method. It panics if s's kind is not struct.
func Fields(s interface{}) []*Field {
return New(s).Fields()
}
// Names returns a slice of field names. For more info refer to Struct types
// Names() method. It panics if s's kind is not struct.
func Names(s interface{}) []string {
return New(s).Names()
}
// IsZero returns true if all fields is equal to a zero value. For more info
// refer to Struct types IsZero() method. It panics if s's kind is not struct.
func IsZero(s interface{}) bool {
return New(s).IsZero()
}
// HasZero returns true if any field is equal to a zero value. For more info
// refer to Struct types HasZero() method. It panics if s's kind is not struct.
func HasZero(s interface{}) bool {
return New(s).HasZero()
}
// IsStruct returns true if the given variable is a struct or a pointer to
// struct.
func IsStruct(s interface{}) bool {
v := reflect.ValueOf(s)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
// uninitialized zero value of a struct
if v.Kind() == reflect.Invalid {
return false
}
return v.Kind() == reflect.Struct
}
// Name returns the structs's type name within its package. It returns an
// empty string for unnamed types. It panics if s's kind is not struct.
func Name(s interface{}) string {
return New(s).Name()
}

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package structs
import "strings"
// tagOptions contains a slice of tag options
type tagOptions []string
// Has returns true if the given optiton is available in tagOptions
func (t tagOptions) Has(opt string) bool {
for _, tagOpt := range t {
if tagOpt == opt {
return true
}
}
return false
}
// parseTag splits a struct field's tag into its name and a list of options
// which comes after a name. A tag is in the form of: "name,option1,option2".
// The name can be neglectected.
func parseTag(tag string) (string, tagOptions) {
// tag is one of followings:
// ""
// "name"
// "name,opt"
// "name,opt,opt2"
// ",opt"
res := strings.Split(tag, ",")
return res[0], res[1:]
}

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language: go
sudo: false
go:
- 1.3
- 1.4
- 1.5
- tip

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Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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context
=======
[![Build Status](https://travis-ci.org/gorilla/context.png?branch=master)](https://travis-ci.org/gorilla/context)
gorilla/context is a general purpose registry for global request variables.
Read the full documentation here: http://www.gorillatoolkit.org/pkg/context

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package context
import (
"net/http"
"sync"
"time"
)
var (
mutex sync.RWMutex
data = make(map[*http.Request]map[interface{}]interface{})
datat = make(map[*http.Request]int64)
)
// Set stores a value for a given key in a given request.
func Set(r *http.Request, key, val interface{}) {
mutex.Lock()
if data[r] == nil {
data[r] = make(map[interface{}]interface{})
datat[r] = time.Now().Unix()
}
data[r][key] = val
mutex.Unlock()
}
// Get returns a value stored for a given key in a given request.
func Get(r *http.Request, key interface{}) interface{} {
mutex.RLock()
if ctx := data[r]; ctx != nil {
value := ctx[key]
mutex.RUnlock()
return value
}
mutex.RUnlock()
return nil
}
// GetOk returns stored value and presence state like multi-value return of map access.
func GetOk(r *http.Request, key interface{}) (interface{}, bool) {
mutex.RLock()
if _, ok := data[r]; ok {
value, ok := data[r][key]
mutex.RUnlock()
return value, ok
}
mutex.RUnlock()
return nil, false
}
// GetAll returns all stored values for the request as a map. Nil is returned for invalid requests.
func GetAll(r *http.Request) map[interface{}]interface{} {
mutex.RLock()
if context, ok := data[r]; ok {
result := make(map[interface{}]interface{}, len(context))
for k, v := range context {
result[k] = v
}
mutex.RUnlock()
return result
}
mutex.RUnlock()
return nil
}
// GetAllOk returns all stored values for the request as a map and a boolean value that indicates if
// the request was registered.
func GetAllOk(r *http.Request) (map[interface{}]interface{}, bool) {
mutex.RLock()
context, ok := data[r]
result := make(map[interface{}]interface{}, len(context))
for k, v := range context {
result[k] = v
}
mutex.RUnlock()
return result, ok
}
// Delete removes a value stored for a given key in a given request.
func Delete(r *http.Request, key interface{}) {
mutex.Lock()
if data[r] != nil {
delete(data[r], key)
}
mutex.Unlock()
}
// Clear removes all values stored for a given request.
//
// This is usually called by a handler wrapper to clean up request
// variables at the end of a request lifetime. See ClearHandler().
func Clear(r *http.Request) {
mutex.Lock()
clear(r)
mutex.Unlock()
}
// clear is Clear without the lock.
func clear(r *http.Request) {
delete(data, r)
delete(datat, r)
}
// Purge removes request data stored for longer than maxAge, in seconds.
// It returns the amount of requests removed.
//
// If maxAge <= 0, all request data is removed.
//
// This is only used for sanity check: in case context cleaning was not
// properly set some request data can be kept forever, consuming an increasing
// amount of memory. In case this is detected, Purge() must be called
// periodically until the problem is fixed.
func Purge(maxAge int) int {
mutex.Lock()
count := 0
if maxAge <= 0 {
count = len(data)
data = make(map[*http.Request]map[interface{}]interface{})
datat = make(map[*http.Request]int64)
} else {
min := time.Now().Unix() - int64(maxAge)
for r := range data {
if datat[r] < min {
clear(r)
count++
}
}
}
mutex.Unlock()
return count
}
// ClearHandler wraps an http.Handler and clears request values at the end
// of a request lifetime.
func ClearHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer Clear(r)
h.ServeHTTP(w, r)
})
}

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package context stores values shared during a request lifetime.
For example, a router can set variables extracted from the URL and later
application handlers can access those values, or it can be used to store
sessions values to be saved at the end of a request. There are several
others common uses.
The idea was posted by Brad Fitzpatrick to the go-nuts mailing list:
http://groups.google.com/group/golang-nuts/msg/e2d679d303aa5d53
Here's the basic usage: first define the keys that you will need. The key
type is interface{} so a key can be of any type that supports equality.
Here we define a key using a custom int type to avoid name collisions:
package foo
import (
"github.com/gorilla/context"
)
type key int
const MyKey key = 0
Then set a variable. Variables are bound to an http.Request object, so you
need a request instance to set a value:
context.Set(r, MyKey, "bar")
The application can later access the variable using the same key you provided:
func MyHandler(w http.ResponseWriter, r *http.Request) {
// val is "bar".
val := context.Get(r, foo.MyKey)
// returns ("bar", true)
val, ok := context.GetOk(r, foo.MyKey)
// ...
}
And that's all about the basic usage. We discuss some other ideas below.
Any type can be stored in the context. To enforce a given type, make the key
private and wrap Get() and Set() to accept and return values of a specific
type:
type key int
const mykey key = 0
// GetMyKey returns a value for this package from the request values.
func GetMyKey(r *http.Request) SomeType {
if rv := context.Get(r, mykey); rv != nil {
return rv.(SomeType)
}
return nil
}
// SetMyKey sets a value for this package in the request values.
func SetMyKey(r *http.Request, val SomeType) {
context.Set(r, mykey, val)
}
Variables must be cleared at the end of a request, to remove all values
that were stored. This can be done in an http.Handler, after a request was
served. Just call Clear() passing the request:
context.Clear(r)
...or use ClearHandler(), which conveniently wraps an http.Handler to clear
variables at the end of a request lifetime.
The Routers from the packages gorilla/mux and gorilla/pat call Clear()
so if you are using either of them you don't need to clear the context manually.
*/
package context

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language: go
go:
- 1.0
- 1.1
- 1.2
- tip

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Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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securecookie
============
[![Build Status](https://travis-ci.org/gorilla/securecookie.png?branch=master)](https://travis-ci.org/gorilla/securecookie)

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package gorilla/securecookie encodes and decodes authenticated and optionally
encrypted cookie values.
Secure cookies can't be forged, because their values are validated using HMAC.
When encrypted, the content is also inaccessible to malicious eyes.
To use it, first create a new SecureCookie instance:
var hashKey = []byte("very-secret")
var blockKey = []byte("a-lot-secret")
var s = securecookie.New(hashKey, blockKey)
The hashKey is required, used to authenticate the cookie value using HMAC.
It is recommended to use a key with 32 or 64 bytes.
The blockKey is optional, used to encrypt the cookie value -- set it to nil
to not use encryption. If set, the length must correspond to the block size
of the encryption algorithm. For AES, used by default, valid lengths are
16, 24, or 32 bytes to select AES-128, AES-192, or AES-256.
Strong keys can be created using the convenience function GenerateRandomKey().
Once a SecureCookie instance is set, use it to encode a cookie value:
func SetCookieHandler(w http.ResponseWriter, r *http.Request) {
value := map[string]string{
"foo": "bar",
}
if encoded, err := s.Encode("cookie-name", value); err == nil {
cookie := &http.Cookie{
Name: "cookie-name",
Value: encoded,
Path: "/",
}
http.SetCookie(w, cookie)
}
}
Later, use the same SecureCookie instance to decode and validate a cookie
value:
func ReadCookieHandler(w http.ResponseWriter, r *http.Request) {
if cookie, err := r.Cookie("cookie-name"); err == nil {
value := make(map[string]string)
if err = s2.Decode("cookie-name", cookie.Value, &value); err == nil {
fmt.Fprintf(w, "The value of foo is %q", value["foo"])
}
}
}
We stored a map[string]string, but secure cookies can hold any value that
can be encoded using encoding/gob. To store custom types, they must be
registered first using gob.Register(). For basic types this is not needed;
it works out of the box.
*/
package securecookie

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package securecookie
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
"crypto/rand"
"crypto/sha256"
"crypto/subtle"
"encoding/base64"
"encoding/gob"
"errors"
"fmt"
"hash"
"io"
"strconv"
"time"
)
var (
errNoCodecs = errors.New("securecookie: no codecs provided")
errHashKeyNotSet = errors.New("securecookie: hash key is not set")
ErrMacInvalid = errors.New("securecookie: the value is not valid")
)
// Codec defines an interface to encode and decode cookie values.
type Codec interface {
Encode(name string, value interface{}) (string, error)
Decode(name, value string, dst interface{}) error
}
// New returns a new SecureCookie.
//
// hashKey is required, used to authenticate values using HMAC. Create it using
// GenerateRandomKey(). It is recommended to use a key with 32 or 64 bytes.
//
// blockKey is optional, used to encrypt values. Create it using
// GenerateRandomKey(). The key length must correspond to the block size
// of the encryption algorithm. For AES, used by default, valid lengths are
// 16, 24, or 32 bytes to select AES-128, AES-192, or AES-256.
func New(hashKey, blockKey []byte) *SecureCookie {
s := &SecureCookie{
hashKey: hashKey,
blockKey: blockKey,
hashFunc: sha256.New,
maxAge: 86400 * 30,
maxLength: 4096,
}
if hashKey == nil {
s.err = errHashKeyNotSet
}
if blockKey != nil {
s.BlockFunc(aes.NewCipher)
}
return s
}
// SecureCookie encodes and decodes authenticated and optionally encrypted
// cookie values.
type SecureCookie struct {
hashKey []byte
hashFunc func() hash.Hash
blockKey []byte
block cipher.Block
maxLength int
maxAge int64
minAge int64
err error
// For testing purposes, the function that returns the current timestamp.
// If not set, it will use time.Now().UTC().Unix().
timeFunc func() int64
}
// MaxLength restricts the maximum length, in bytes, for the cookie value.
//
// Default is 4096, which is the maximum value accepted by Internet Explorer.
func (s *SecureCookie) MaxLength(value int) *SecureCookie {
s.maxLength = value
return s
}
// MaxAge restricts the maximum age, in seconds, for the cookie value.
//
// Default is 86400 * 30. Set it to 0 for no restriction.
func (s *SecureCookie) MaxAge(value int) *SecureCookie {
s.maxAge = int64(value)
return s
}
// MinAge restricts the minimum age, in seconds, for the cookie value.
//
// Default is 0 (no restriction).
func (s *SecureCookie) MinAge(value int) *SecureCookie {
s.minAge = int64(value)
return s
}
// HashFunc sets the hash function used to create HMAC.
//
// Default is crypto/sha256.New.
func (s *SecureCookie) HashFunc(f func() hash.Hash) *SecureCookie {
s.hashFunc = f
return s
}
// BlockFunc sets the encryption function used to create a cipher.Block.
//
// Default is crypto/aes.New.
func (s *SecureCookie) BlockFunc(f func([]byte) (cipher.Block, error)) *SecureCookie {
if s.blockKey == nil {
s.err = errors.New("securecookie: block key is not set")
} else if block, err := f(s.blockKey); err == nil {
s.block = block
} else {
s.err = err
}
return s
}
// Encode encodes a cookie value.
//
// It serializes, optionally encrypts, signs with a message authentication code, and
// finally encodes the value.
//
// The name argument is the cookie name. It is stored with the encoded value.
// The value argument is the value to be encoded. It can be any value that can
// be encoded using encoding/gob. To store special structures, they must be
// registered first using gob.Register().
func (s *SecureCookie) Encode(name string, value interface{}) (string, error) {
if s.err != nil {
return "", s.err
}
if s.hashKey == nil {
s.err = errHashKeyNotSet
return "", s.err
}
var err error
var b []byte
// 1. Serialize.
if b, err = serialize(value); err != nil {
return "", err
}
// 2. Encrypt (optional).
if s.block != nil {
if b, err = encrypt(s.block, b); err != nil {
return "", err
}
}
b = encode(b)
// 3. Create MAC for "name|date|value". Extra pipe to be used later.
b = []byte(fmt.Sprintf("%s|%d|%s|", name, s.timestamp(), b))
mac := createMac(hmac.New(s.hashFunc, s.hashKey), b[:len(b)-1])
// Append mac, remove name.
b = append(b, mac...)[len(name)+1:]
// 4. Encode to base64.
b = encode(b)
// 5. Check length.
if s.maxLength != 0 && len(b) > s.maxLength {
return "", errors.New("securecookie: the value is too long")
}
// Done.
return string(b), nil
}
// Decode decodes a cookie value.
//
// It decodes, verifies a message authentication code, optionally decrypts and
// finally deserializes the value.
//
// The name argument is the cookie name. It must be the same name used when
// it was stored. The value argument is the encoded cookie value. The dst
// argument is where the cookie will be decoded. It must be a pointer.
func (s *SecureCookie) Decode(name, value string, dst interface{}) error {
if s.err != nil {
return s.err
}
if s.hashKey == nil {
s.err = errHashKeyNotSet
return s.err
}
// 1. Check length.
if s.maxLength != 0 && len(value) > s.maxLength {
return errors.New("securecookie: the value is too long")
}
// 2. Decode from base64.
b, err := decode([]byte(value))
if err != nil {
return err
}
// 3. Verify MAC. Value is "date|value|mac".
parts := bytes.SplitN(b, []byte("|"), 3)
if len(parts) != 3 {
return errors.New("securecookie: invalid value %v")
}
h := hmac.New(s.hashFunc, s.hashKey)
b = append([]byte(name+"|"), b[:len(b)-len(parts[2])-1]...)
if err = verifyMac(h, b, parts[2]); err != nil {
return err
}
// 4. Verify date ranges.
var t1 int64
if t1, err = strconv.ParseInt(string(parts[0]), 10, 64); err != nil {
return errors.New("securecookie: invalid timestamp")
}
t2 := s.timestamp()
if s.minAge != 0 && t1 > t2-s.minAge {
return errors.New("securecookie: timestamp is too new")
}
if s.maxAge != 0 && t1 < t2-s.maxAge {
return errors.New("securecookie: expired timestamp")
}
// 5. Decrypt (optional).
b, err = decode(parts[1])
if err != nil {
return err
}
if s.block != nil {
if b, err = decrypt(s.block, b); err != nil {
return err
}
}
// 6. Deserialize.
if err = deserialize(b, dst); err != nil {
return err
}
// Done.
return nil
}
// timestamp returns the current timestamp, in seconds.
//
// For testing purposes, the function that generates the timestamp can be
// overridden. If not set, it will return time.Now().UTC().Unix().
func (s *SecureCookie) timestamp() int64 {
if s.timeFunc == nil {
return time.Now().UTC().Unix()
}
return s.timeFunc()
}
// Authentication -------------------------------------------------------------
// createMac creates a message authentication code (MAC).
func createMac(h hash.Hash, value []byte) []byte {
h.Write(value)
return h.Sum(nil)
}
// verifyMac verifies that a message authentication code (MAC) is valid.
func verifyMac(h hash.Hash, value []byte, mac []byte) error {
mac2 := createMac(h, value)
if len(mac) == len(mac2) && subtle.ConstantTimeCompare(mac, mac2) == 1 {
return nil
}
return ErrMacInvalid
}
// Encryption -----------------------------------------------------------------
// encrypt encrypts a value using the given block in counter mode.
//
// A random initialization vector (http://goo.gl/zF67k) with the length of the
// block size is prepended to the resulting ciphertext.
func encrypt(block cipher.Block, value []byte) ([]byte, error) {
iv := GenerateRandomKey(block.BlockSize())
if iv == nil {
return nil, errors.New("securecookie: failed to generate random iv")
}
// Encrypt it.
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(value, value)
// Return iv + ciphertext.
return append(iv, value...), nil
}
// decrypt decrypts a value using the given block in counter mode.
//
// The value to be decrypted must be prepended by a initialization vector
// (http://goo.gl/zF67k) with the length of the block size.
func decrypt(block cipher.Block, value []byte) ([]byte, error) {
size := block.BlockSize()
if len(value) > size {
// Extract iv.
iv := value[:size]
// Extract ciphertext.
value = value[size:]
// Decrypt it.
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(value, value)
return value, nil
}
return nil, errors.New("securecookie: the value could not be decrypted")
}
// Serialization --------------------------------------------------------------
// serialize encodes a value using gob.
func serialize(src interface{}) ([]byte, error) {
buf := new(bytes.Buffer)
enc := gob.NewEncoder(buf)
if err := enc.Encode(src); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// deserialize decodes a value using gob.
func deserialize(src []byte, dst interface{}) error {
dec := gob.NewDecoder(bytes.NewBuffer(src))
if err := dec.Decode(dst); err != nil {
return err
}
return nil
}
// Encoding -------------------------------------------------------------------
// encode encodes a value using base64.
func encode(value []byte) []byte {
encoded := make([]byte, base64.URLEncoding.EncodedLen(len(value)))
base64.URLEncoding.Encode(encoded, value)
return encoded
}
// decode decodes a cookie using base64.
func decode(value []byte) ([]byte, error) {
decoded := make([]byte, base64.URLEncoding.DecodedLen(len(value)))
b, err := base64.URLEncoding.Decode(decoded, value)
if err != nil {
return nil, err
}
return decoded[:b], nil
}
// Helpers --------------------------------------------------------------------
// GenerateRandomKey creates a random key with the given strength.
func GenerateRandomKey(strength int) []byte {
k := make([]byte, strength)
if _, err := io.ReadFull(rand.Reader, k); err != nil {
return nil
}
return k
}
// CodecsFromPairs returns a slice of SecureCookie instances.
//
// It is a convenience function to create a list of codecs for key rotation.
func CodecsFromPairs(keyPairs ...[]byte) []Codec {
codecs := make([]Codec, len(keyPairs)/2+len(keyPairs)%2)
for i := 0; i < len(keyPairs); i += 2 {
var blockKey []byte
if i+1 < len(keyPairs) {
blockKey = keyPairs[i+1]
}
codecs[i/2] = New(keyPairs[i], blockKey)
}
return codecs
}
// EncodeMulti encodes a cookie value using a group of codecs.
//
// The codecs are tried in order. Multiple codecs are accepted to allow
// key rotation.
func EncodeMulti(name string, value interface{}, codecs ...Codec) (string, error) {
if len(codecs) == 0 {
return "", errNoCodecs
}
var errors MultiError
for _, codec := range codecs {
if encoded, err := codec.Encode(name, value); err == nil {
return encoded, nil
} else {
errors = append(errors, err)
}
}
return "", errors
}
// DecodeMulti decodes a cookie value using a group of codecs.
//
// The codecs are tried in order. Multiple codecs are accepted to allow
// key rotation.
func DecodeMulti(name string, value string, dst interface{}, codecs ...Codec) error {
if len(codecs) == 0 {
return errNoCodecs
}
var errors MultiError
for _, codec := range codecs {
if err := codec.Decode(name, value, dst); err == nil {
return nil
} else {
errors = append(errors, err)
}
}
return errors
}
// MultiError groups multiple errors.
type MultiError []error
func (m MultiError) Error() string {
s, n := "", 0
for _, e := range m {
if e != nil {
if n == 0 {
s = e.Error()
}
n++
}
}
switch n {
case 0:
return "(0 errors)"
case 1:
return s
case 2:
return s + " (and 1 other error)"
}
return fmt.Sprintf("%s (and %d other errors)", s, n-1)
}

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language: go
go:
- 1.0
- 1.1
- 1.2
- tip

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Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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sessions
========
Store Implementations
---------------------
Other implementations of the sessions.Store interface:
* [github.com/yosssi/boltstore](https://github.com/yosssi/boltstore) - Bolt
* [github.com/srinathgs/couchbasestore](https://github.com/srinathgs/couchbasestore) - Couchbase
* [github.com/bradleypeabody/gorilla-sessions-memcache](https://github.com/bradleypeabody/gorilla-sessions-memcache) - Memcache
* [github.com/hnakamur/gaesessions](https://github.com/hnakamur/gaesessions) - Memcache on GAE
* [github.com/kidstuff/mongostore](https://github.com/kidstuff/mongostore) - MongoDB
* [github.com/srinathgs/mysqlstore](https://github.com/srinathgs/mysqlstore) - MySQL
* [github.com/antonlindstrom/pgstore](https://github.com/antonlindstrom/pgstore) - PostgreSQL
* [github.com/boj/redistore](https://github.com/boj/redistore) - Redis
* [github.com/boj/riakstore](https://github.com/boj/riakstore) - Riak

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package gorilla/sessions provides cookie and filesystem sessions and
infrastructure for custom session backends.
The key features are:
* Simple API: use it as an easy way to set signed (and optionally
encrypted) cookies.
* Built-in backends to store sessions in cookies or the filesystem.
* Flash messages: session values that last until read.
* Convenient way to switch session persistency (aka "remember me") and set
other attributes.
* Mechanism to rotate authentication and encryption keys.
* Multiple sessions per request, even using different backends.
* Interfaces and infrastructure for custom session backends: sessions from
different stores can be retrieved and batch-saved using a common API.
Let's start with an example that shows the sessions API in a nutshell:
import (
"net/http"
"github.com/gorilla/sessions"
)
var store = sessions.NewCookieStore([]byte("something-very-secret"))
func MyHandler(w http.ResponseWriter, r *http.Request) {
// Get a session. We're ignoring the error resulted from decoding an
// existing session: Get() always returns a session, even if empty.
session, _ := store.Get(r, "session-name")
// Set some session values.
session.Values["foo"] = "bar"
session.Values[42] = 43
// Save it.
session.Save(r, w)
}
First we initialize a session store calling NewCookieStore() and passing a
secret key used to authenticate the session. Inside the handler, we call
store.Get() to retrieve an existing session or a new one. Then we set some
session values in session.Values, which is a map[interface{}]interface{}.
And finally we call session.Save() to save the session in the response.
Note that in production code, we should check for errors when calling
session.Save(r, w), and either display an error message or otherwise handle it.
Important Note: If you aren't using gorilla/mux, you need to wrap your handlers
with context.ClearHandler as or else you will leak memory! An easy way to do this
is to wrap the top-level mux when calling http.ListenAndServe:
http.ListenAndServe(":8080", context.ClearHandler(http.DefaultServeMux))
The ClearHandler function is provided by the gorilla/context package.
That's all you need to know for the basic usage. Let's take a look at other
options, starting with flash messages.
Flash messages are session values that last until read. The term appeared with
Ruby On Rails a few years back. When we request a flash message, it is removed
from the session. To add a flash, call session.AddFlash(), and to get all
flashes, call session.Flashes(). Here is an example:
func MyHandler(w http.ResponseWriter, r *http.Request) {
// Get a session.
session, _ := store.Get(r, "session-name")
// Get the previously flashes, if any.
if flashes := session.Flashes(); len(flashes) > 0 {
// Just print the flash values.
fmt.Fprint(w, "%v", flashes)
} else {
// Set a new flash.
session.AddFlash("Hello, flash messages world!")
fmt.Fprint(w, "No flashes found.")
}
session.Save(r, w)
}
Flash messages are useful to set information to be read after a redirection,
like after form submissions.
There may also be cases where you want to store a complex datatype within a
session, such as a struct. Sessions are serialised using the encoding/gob package,
so it is easy to register new datatypes for storage in sessions:
import(
"encoding/gob"
"github.com/gorilla/sessions"
)
type Person struct {
FirstName string
LastName string
Email string
Age int
}
type M map[string]interface{}
func init() {
gob.Register(&Person{})
gob.Register(&M{})
}
As it's not possible to pass a raw type as a parameter to a function, gob.Register()
relies on us passing it an empty pointer to the type as a parameter. In the example
above we've passed it a pointer to a struct and a pointer to a custom type
representing a map[string]interface. This will then allow us to serialise/deserialise
values of those types to and from our sessions.
By default, session cookies last for a month. This is probably too long for
some cases, but it is easy to change this and other attributes during
runtime. Sessions can be configured individually or the store can be
configured and then all sessions saved using it will use that configuration.
We access session.Options or store.Options to set a new configuration. The
fields are basically a subset of http.Cookie fields. Let's change the
maximum age of a session to one week:
session.Options = &sessions.Options{
Path: "/",
MaxAge: 86400 * 7,
HttpOnly: true,
}
Sometimes we may want to change authentication and/or encryption keys without
breaking existing sessions. The CookieStore supports key rotation, and to use
it you just need to set multiple authentication and encryption keys, in pairs,
to be tested in order:
var store = sessions.NewCookieStore(
[]byte("new-authentication-key"),
[]byte("new-encryption-key"),
[]byte("old-authentication-key"),
[]byte("old-encryption-key"),
)
New sessions will be saved using the first pair. Old sessions can still be
read because the first pair will fail, and the second will be tested. This
makes it easy to "rotate" secret keys and still be able to validate existing
sessions. Note: for all pairs the encryption key is optional; set it to nil
or omit it and and encryption won't be used.
Multiple sessions can be used in the same request, even with different
session backends. When this happens, calling Save() on each session
individually would be cumbersome, so we have a way to save all sessions
at once: it's sessions.Save(). Here's an example:
var store = sessions.NewCookieStore([]byte("something-very-secret"))
func MyHandler(w http.ResponseWriter, r *http.Request) {
// Get a session and set a value.
session1, _ := store.Get(r, "session-one")
session1.Values["foo"] = "bar"
// Get another session and set another value.
session2, _ := store.Get(r, "session-two")
session2.Values[42] = 43
// Save all sessions.
sessions.Save(r, w)
}
This is possible because when we call Get() from a session store, it adds the
session to a common registry. Save() uses it to save all registered sessions.
*/
package sessions

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sessions
import (
"encoding/gob"
"fmt"
"net/http"
"time"
"github.com/gorilla/context"
)
// Default flashes key.
const flashesKey = "_flash"
// Options --------------------------------------------------------------------
// Options stores configuration for a session or session store.
//
// Fields are a subset of http.Cookie fields.
type Options struct {
Path string
Domain string
// MaxAge=0 means no 'Max-Age' attribute specified.
// MaxAge<0 means delete cookie now, equivalently 'Max-Age: 0'.
// MaxAge>0 means Max-Age attribute present and given in seconds.
MaxAge int
Secure bool
HttpOnly bool
}
// Session --------------------------------------------------------------------
// NewSession is called by session stores to create a new session instance.
func NewSession(store Store, name string) *Session {
return &Session{
Values: make(map[interface{}]interface{}),
store: store,
name: name,
}
}
// Session stores the values and optional configuration for a session.
type Session struct {
ID string
Values map[interface{}]interface{}
Options *Options
IsNew bool
store Store
name string
}
// Flashes returns a slice of flash messages from the session.
//
// A single variadic argument is accepted, and it is optional: it defines
// the flash key. If not defined "_flash" is used by default.
func (s *Session) Flashes(vars ...string) []interface{} {
var flashes []interface{}
key := flashesKey
if len(vars) > 0 {
key = vars[0]
}
if v, ok := s.Values[key]; ok {
// Drop the flashes and return it.
delete(s.Values, key)
flashes = v.([]interface{})
}
return flashes
}
// AddFlash adds a flash message to the session.
//
// A single variadic argument is accepted, and it is optional: it defines
// the flash key. If not defined "_flash" is used by default.
func (s *Session) AddFlash(value interface{}, vars ...string) {
key := flashesKey
if len(vars) > 0 {
key = vars[0]
}
var flashes []interface{}
if v, ok := s.Values[key]; ok {
flashes = v.([]interface{})
}
s.Values[key] = append(flashes, value)
}
// Save is a convenience method to save this session. It is the same as calling
// store.Save(request, response, session)
func (s *Session) Save(r *http.Request, w http.ResponseWriter) error {
return s.store.Save(r, w, s)
}
// Name returns the name used to register the session.
func (s *Session) Name() string {
return s.name
}
// Store returns the session store used to register the session.
func (s *Session) Store() Store {
return s.store
}
// Registry -------------------------------------------------------------------
// sessionInfo stores a session tracked by the registry.
type sessionInfo struct {
s *Session
e error
}
// contextKey is the type used to store the registry in the context.
type contextKey int
// registryKey is the key used to store the registry in the context.
const registryKey contextKey = 0
// GetRegistry returns a registry instance for the current request.
func GetRegistry(r *http.Request) *Registry {
registry := context.Get(r, registryKey)
if registry != nil {
return registry.(*Registry)
}
newRegistry := &Registry{
request: r,
sessions: make(map[string]sessionInfo),
}
context.Set(r, registryKey, newRegistry)
return newRegistry
}
// Registry stores sessions used during a request.
type Registry struct {
request *http.Request
sessions map[string]sessionInfo
}
// Get registers and returns a session for the given name and session store.
//
// It returns a new session if there are no sessions registered for the name.
func (s *Registry) Get(store Store, name string) (session *Session, err error) {
if info, ok := s.sessions[name]; ok {
session, err = info.s, info.e
} else {
session, err = store.New(s.request, name)
session.name = name
s.sessions[name] = sessionInfo{s: session, e: err}
}
session.store = store
return
}
// Save saves all sessions registered for the current request.
func (s *Registry) Save(w http.ResponseWriter) error {
var errMulti MultiError
for name, info := range s.sessions {
session := info.s
if session.store == nil {
errMulti = append(errMulti, fmt.Errorf(
"sessions: missing store for session %q", name))
} else if err := session.store.Save(s.request, w, session); err != nil {
errMulti = append(errMulti, fmt.Errorf(
"sessions: error saving session %q -- %v", name, err))
}
}
if errMulti != nil {
return errMulti
}
return nil
}
// Helpers --------------------------------------------------------------------
func init() {
gob.Register([]interface{}{})
}
// Save saves all sessions used during the current request.
func Save(r *http.Request, w http.ResponseWriter) error {
return GetRegistry(r).Save(w)
}
// NewCookie returns an http.Cookie with the options set. It also sets
// the Expires field calculated based on the MaxAge value, for Internet
// Explorer compatibility.
func NewCookie(name, value string, options *Options) *http.Cookie {
cookie := &http.Cookie{
Name: name,
Value: value,
Path: options.Path,
Domain: options.Domain,
MaxAge: options.MaxAge,
Secure: options.Secure,
HttpOnly: options.HttpOnly,
}
if options.MaxAge > 0 {
d := time.Duration(options.MaxAge) * time.Second
cookie.Expires = time.Now().Add(d)
} else if options.MaxAge < 0 {
// Set it to the past to expire now.
cookie.Expires = time.Unix(1, 0)
}
return cookie
}
// Error ----------------------------------------------------------------------
// MultiError stores multiple errors.
//
// Borrowed from the App Engine SDK.
type MultiError []error
func (m MultiError) Error() string {
s, n := "", 0
for _, e := range m {
if e != nil {
if n == 0 {
s = e.Error()
}
n++
}
}
switch n {
case 0:
return "(0 errors)"
case 1:
return s
case 2:
return s + " (and 1 other error)"
}
return fmt.Sprintf("%s (and %d other errors)", s, n-1)
}

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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sessions
import (
"encoding/base32"
"io"
"net/http"
"os"
"strings"
"sync"
"github.com/gorilla/securecookie"
)
// Store is an interface for custom session stores.
//
// See CookieStore and FilesystemStore for examples.
type Store interface {
// Get should return a cached session.
Get(r *http.Request, name string) (*Session, error)
// New should create and return a new session.
//
// Note that New should never return a nil session, even in the case of
// an error if using the Registry infrastructure to cache the session.
New(r *http.Request, name string) (*Session, error)
// Save should persist session to the underlying store implementation.
Save(r *http.Request, w http.ResponseWriter, s *Session) error
}
// CookieStore ----------------------------------------------------------------
// NewCookieStore returns a new CookieStore.
//
// Keys are defined in pairs to allow key rotation, but the common case is
// to set a single authentication key and optionally an encryption key.
//
// The first key in a pair is used for authentication and the second for
// encryption. The encryption key can be set to nil or omitted in the last
// pair, but the authentication key is required in all pairs.
//
// It is recommended to use an authentication key with 32 or 64 bytes.
// The encryption key, if set, must be either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256 modes.
//
// Use the convenience function securecookie.GenerateRandomKey() to create
// strong keys.
func NewCookieStore(keyPairs ...[]byte) *CookieStore {
return &CookieStore{
Codecs: securecookie.CodecsFromPairs(keyPairs...),
Options: &Options{
Path: "/",
MaxAge: 86400 * 30,
},
}
}
// CookieStore stores sessions using secure cookies.
type CookieStore struct {
Codecs []securecookie.Codec
Options *Options // default configuration
}
// Get returns a session for the given name after adding it to the registry.
//
// It returns a new session if the sessions doesn't exist. Access IsNew on
// the session to check if it is an existing session or a new one.
//
// It returns a new session and an error if the session exists but could
// not be decoded.
func (s *CookieStore) Get(r *http.Request, name string) (*Session, error) {
return GetRegistry(r).Get(s, name)
}
// New returns a session for the given name without adding it to the registry.
//
// The difference between New() and Get() is that calling New() twice will
// decode the session data twice, while Get() registers and reuses the same
// decoded session after the first call.
func (s *CookieStore) New(r *http.Request, name string) (*Session, error) {
session := NewSession(s, name)
opts := *s.Options
session.Options = &opts
session.IsNew = true
var err error
if c, errCookie := r.Cookie(name); errCookie == nil {
err = securecookie.DecodeMulti(name, c.Value, &session.Values,
s.Codecs...)
if err == nil {
session.IsNew = false
}
}
return session, err
}
// Save adds a single session to the response.
func (s *CookieStore) Save(r *http.Request, w http.ResponseWriter,
session *Session) error {
encoded, err := securecookie.EncodeMulti(session.Name(), session.Values,
s.Codecs...)
if err != nil {
return err
}
http.SetCookie(w, NewCookie(session.Name(), encoded, session.Options))
return nil
}
// FilesystemStore ------------------------------------------------------------
var fileMutex sync.RWMutex
// NewFilesystemStore returns a new FilesystemStore.
//
// The path argument is the directory where sessions will be saved. If empty
// it will use os.TempDir().
//
// See NewCookieStore() for a description of the other parameters.
func NewFilesystemStore(path string, keyPairs ...[]byte) *FilesystemStore {
if path == "" {
path = os.TempDir()
}
if path[len(path)-1] != '/' {
path += "/"
}
return &FilesystemStore{
Codecs: securecookie.CodecsFromPairs(keyPairs...),
Options: &Options{
Path: "/",
MaxAge: 86400 * 30,
},
path: path,
}
}
// FilesystemStore stores sessions in the filesystem.
//
// It also serves as a referece for custom stores.
//
// This store is still experimental and not well tested. Feedback is welcome.
type FilesystemStore struct {
Codecs []securecookie.Codec
Options *Options // default configuration
path string
}
// MaxLength restricts the maximum length of new sessions to l.
// If l is 0 there is no limit to the size of a session, use with caution.
// The default for a new FilesystemStore is 4096.
func (s *FilesystemStore) MaxLength(l int) {
for _, c := range s.Codecs {
if codec, ok := c.(*securecookie.SecureCookie); ok {
codec.MaxLength(l)
}
}
}
// Get returns a session for the given name after adding it to the registry.
//
// See CookieStore.Get().
func (s *FilesystemStore) Get(r *http.Request, name string) (*Session, error) {
return GetRegistry(r).Get(s, name)
}
// New returns a session for the given name without adding it to the registry.
//
// See CookieStore.New().
func (s *FilesystemStore) New(r *http.Request, name string) (*Session, error) {
session := NewSession(s, name)
opts := *s.Options
session.Options = &opts
session.IsNew = true
var err error
if c, errCookie := r.Cookie(name); errCookie == nil {
err = securecookie.DecodeMulti(name, c.Value, &session.ID, s.Codecs...)
if err == nil {
err = s.load(session)
if err == nil {
session.IsNew = false
}
}
}
return session, err
}
// Save adds a single session to the response.
func (s *FilesystemStore) Save(r *http.Request, w http.ResponseWriter,
session *Session) error {
if session.ID == "" {
// Because the ID is used in the filename, encode it to
// use alphanumeric characters only.
session.ID = strings.TrimRight(
base32.StdEncoding.EncodeToString(
securecookie.GenerateRandomKey(32)), "=")
}
if err := s.save(session); err != nil {
return err
}
encoded, err := securecookie.EncodeMulti(session.Name(), session.ID,
s.Codecs...)
if err != nil {
return err
}
http.SetCookie(w, NewCookie(session.Name(), encoded, session.Options))
return nil
}
// save writes encoded session.Values to a file.
func (s *FilesystemStore) save(session *Session) error {
encoded, err := securecookie.EncodeMulti(session.Name(), session.Values,
s.Codecs...)
if err != nil {
return err
}
filename := s.path + "session_" + session.ID
fileMutex.Lock()
defer fileMutex.Unlock()
fp, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
if _, err = fp.Write([]byte(encoded)); err != nil {
return err
}
fp.Close()
return nil
}
// load reads a file and decodes its content into session.Values.
func (s *FilesystemStore) load(session *Session) error {
filename := s.path + "session_" + session.ID
fp, err := os.OpenFile(filename, os.O_RDONLY, 0400)
if err != nil {
return err
}
defer fp.Close()
var fdata []byte
buf := make([]byte, 128)
for {
var n int
n, err = fp.Read(buf[0:])
fdata = append(fdata, buf[0:n]...)
if err != nil {
if err == io.EOF {
break
}
return err
}
}
if err = securecookie.DecodeMulti(session.Name(), string(fdata),
&session.Values, s.Codecs...); err != nil {
return err
}
return nil
}

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Mozilla Public License, version 2.0
1. Definitions
1.1. “Contributor”
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. “Contributor Version”
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor’s Contribution.
1.3. “Contribution”
means Covered Software of a particular Contributor.
1.4. “Covered Software”
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. “Incompatible With Secondary Licenses”
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of version
1.1 or earlier of the License, but not also under the terms of a
Secondary License.
1.6. “Executable Form”
means any form of the work other than Source Code Form.
1.7. “Larger Work”
means a work that combines Covered Software with other material, in a separate
file or files, that is not Covered Software.
1.8. “License”
means this document.
1.9. “Licensable”
means having the right to grant, to the maximum extent possible, whether at the
time of the initial grant or subsequently, any and all of the rights conveyed by
this License.
1.10. “Modifications”
means any of the following:
a. any file in Source Code Form that results from an addition to, deletion
from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. “Patent Claims” of a Contributor
means any patent claim(s), including without limitation, method, process,
and apparatus claims, in any patent Licensable by such Contributor that
would be infringed, but for the grant of the License, by the making,
using, selling, offering for sale, having made, import, or transfer of
either its Contributions or its Contributor Version.
1.12. “Secondary License”
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. “Source Code Form”
means the form of the work preferred for making modifications.
1.14. “You” (or “Your”)
means an individual or a legal entity exercising rights under this
License. For legal entities, “You” includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, “control” means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or as
part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its Contributions
or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution become
effective for each Contribution on the date the Contributor first distributes
such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under this
License. No additional rights or licenses will be implied from the distribution
or licensing of Covered Software under this License. Notwithstanding Section
2.1(b) above, no patent license is granted by a Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party’s
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of its
Contributions.
This License does not grant any rights in the trademarks, service marks, or
logos of any Contributor (except as may be necessary to comply with the
notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this License
(see Section 10.2) or under the terms of a Secondary License (if permitted
under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its Contributions
are its original creation(s) or it has sufficient rights to grant the
rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under applicable
copyright doctrines of fair use, fair dealing, or other equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under the
terms of this License. You must inform recipients that the Source Code Form
of the Covered Software is governed by the terms of this License, and how
they can obtain a copy of this License. You may not attempt to alter or
restrict the recipients’ rights in the Source Code Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this License,
or sublicense it under different terms, provided that the license for
the Executable Form does not attempt to limit or alter the recipients’
rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for the
Covered Software. If the Larger Work is a combination of Covered Software
with a work governed by one or more Secondary Licenses, and the Covered
Software is not Incompatible With Secondary Licenses, this License permits
You to additionally distribute such Covered Software under the terms of
such Secondary License(s), so that the recipient of the Larger Work may, at
their option, further distribute the Covered Software under the terms of
either this License or such Secondary License(s).
3.4. Notices
You may not remove or alter the substance of any license notices (including
copyright notices, patent notices, disclaimers of warranty, or limitations
of liability) contained within the Source Code Form of the Covered
Software, except that You may alter any license notices to the extent
required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on behalf
of any Contributor. You must make it absolutely clear that any such
warranty, support, indemnity, or liability obligation is offered by You
alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute, judicial
order, or regulation then You must: (a) comply with the terms of this License
to the maximum extent possible; and (b) describe the limitations and the code
they affect. Such description must be placed in a text file included with all
distributions of the Covered Software under this License. Except to the
extent prohibited by statute or regulation, such description must be
sufficiently detailed for a recipient of ordinary skill to be able to
understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing basis,
if such Contributor fails to notify You of the non-compliance by some
reasonable means prior to 60 days after You have come back into compliance.
Moreover, Your grants from a particular Contributor are reinstated on an
ongoing basis if such Contributor notifies You of the non-compliance by
some reasonable means, this is the first time You have received notice of
non-compliance with this License from such Contributor, and You become
compliant prior to 30 days after Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions, counter-claims,
and cross-claims) alleging that a Contributor Version directly or
indirectly infringes any patent, then the rights granted to You by any and
all Contributors for the Covered Software under Section 2.1 of this License
shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an “as is” basis, without
warranty of any kind, either expressed, implied, or statutory, including,
without limitation, warranties that the Covered Software is free of defects,
merchantable, fit for a particular purpose or non-infringing. The entire
risk as to the quality and performance of the Covered Software is with You.
Should any Covered Software prove defective in any respect, You (not any
Contributor) assume the cost of any necessary servicing, repair, or
correction. This disclaimer of warranty constitutes an essential part of this
License. No use of any Covered Software is authorized under this License
except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from such
party’s negligence to the extent applicable law prohibits such limitation.
Some jurisdictions do not allow the exclusion or limitation of incidental or
consequential damages, so this exclusion and limitation may not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts of
a jurisdiction where the defendant maintains its principal place of business
and such litigation shall be governed by laws of that jurisdiction, without
reference to its conflict-of-law provisions. Nothing in this Section shall
prevent a party’s ability to bring cross-claims or counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject matter
hereof. If any provision of this License is held to be unenforceable, such
provision shall be reformed only to the extent necessary to make it
enforceable. Any law or regulation which provides that the language of a
contract shall be construed against the drafter shall not be used to construe
this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version of
the License under which You originally received the Covered Software, or
under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a modified
version of this License if you rename the license and remove any
references to the name of the license steward (except to note that such
modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file, then
You may include the notice in a location (such as a LICENSE file in a relevant
directory) where a recipient would be likely to look for such a notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - “Incompatible With Secondary Licenses” Notice
This Source Code Form is “Incompatible
With Secondary Licenses”, as defined by
the Mozilla Public License, v. 2.0.

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# errwrap
`errwrap` is a package for Go that formalizes the pattern of wrapping errors
and checking if an error contains another error.
There is a common pattern in Go of taking a returned `error` value and
then wrapping it (such as with `fmt.Errorf`) before returning it. The problem
with this pattern is that you completely lose the original `error` structure.
Arguably the _correct_ approach is that you should make a custom structure
implementing the `error` interface, and have the original error as a field
on that structure, such [as this example](http://golang.org/pkg/os/#PathError).
This is a good approach, but you have to know the entire chain of possible
rewrapping that happens, when you might just care about one.
`errwrap` formalizes this pattern (it doesn't matter what approach you use
above) by giving a single interface for wrapping errors, checking if a specific
error is wrapped, and extracting that error.
## Installation and Docs
Install using `go get github.com/hashicorp/errwrap`.
Full documentation is available at
http://godoc.org/github.com/hashicorp/errwrap
## Usage
#### Basic Usage
Below is a very basic example of its usage:
```go
// A function that always returns an error, but wraps it, like a real
// function might.
func tryOpen() error {
_, err := os.Open("/i/dont/exist")
if err != nil {
return errwrap.Wrapf("Doesn't exist: {{err}}", err)
}
return nil
}
func main() {
err := tryOpen()
// We can use the Contains helpers to check if an error contains
// another error. It is safe to do this with a nil error, or with
// an error that doesn't even use the errwrap package.
if errwrap.Contains(err, ErrNotExist) {
// Do something
}
if errwrap.ContainsType(err, new(os.PathError)) {
// Do something
}
// Or we can use the associated `Get` functions to just extract
// a specific error. This would return nil if that specific error doesn't
// exist.
perr := errwrap.GetType(err, new(os.PathError))
}
```
#### Custom Types
If you're already making custom types that properly wrap errors, then
you can get all the functionality of `errwraps.Contains` and such by
implementing the `Wrapper` interface with just one function. Example:
```go
type AppError {
Code ErrorCode
Err error
}
func (e *AppError) WrappedErrors() []error {
return []error{e.Err}
}
```
Now this works:
```go
err := &AppError{Err: fmt.Errorf("an error")}
if errwrap.ContainsType(err, fmt.Errorf("")) {
// This will work!
}
```

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// Package errwrap implements methods to formalize error wrapping in Go.
//
// All of the top-level functions that take an `error` are built to be able
// to take any error, not just wrapped errors. This allows you to use errwrap
// without having to type-check and type-cast everywhere.
package errwrap
import (
"errors"
"reflect"
"strings"
)
// WalkFunc is the callback called for Walk.
type WalkFunc func(error)
// Wrapper is an interface that can be implemented by custom types to
// have all the Contains, Get, etc. functions in errwrap work.
//
// When Walk reaches a Wrapper, it will call the callback for every
// wrapped error in addition to the wrapper itself. Since all the top-level
// functions in errwrap use Walk, this means that all those functions work
// with your custom type.
type Wrapper interface {
WrappedErrors() []error
}
// Wrap defines that outer wraps inner, returning an error type that
// can be cleanly used with the other methods in this package, such as
// Contains, GetAll, etc.
//
// This function won't modify the error message at all (the outer message
// will be used).
func Wrap(outer, inner error) error {
return &wrappedError{
Outer: outer,
Inner: inner,
}
}
// Wrapf wraps an error with a formatting message. This is similar to using
// `fmt.Errorf` to wrap an error. If you're using `fmt.Errorf` to wrap
// errors, you should replace it with this.
//
// format is the format of the error message. The string '{{err}}' will
// be replaced with the original error message.
func Wrapf(format string, err error) error {
outerMsg := "<nil>"
if err != nil {
outerMsg = err.Error()
}
outer := errors.New(strings.Replace(
format, "{{err}}", outerMsg, -1))
return Wrap(outer, err)
}
// Contains checks if the given error contains an error with the
// message msg. If err is not a wrapped error, this will always return
// false unless the error itself happens to match this msg.
func Contains(err error, msg string) bool {
return len(GetAll(err, msg)) > 0
}
// ContainsType checks if the given error contains an error with
// the same concrete type as v. If err is not a wrapped error, this will
// check the err itself.
func ContainsType(err error, v interface{}) bool {
return len(GetAllType(err, v)) > 0
}
// Get is the same as GetAll but returns the deepest matching error.
func Get(err error, msg string) error {
es := GetAll(err, msg)
if len(es) > 0 {
return es[len(es)-1]
}
return nil
}
// GetType is the same as GetAllType but returns the deepest matching error.
func GetType(err error, v interface{}) error {
es := GetAllType(err, v)
if len(es) > 0 {
return es[len(es)-1]
}
return nil
}
// GetAll gets all the errors that might be wrapped in err with the
// given message. The order of the errors is such that the outermost
// matching error (the most recent wrap) is index zero, and so on.
func GetAll(err error, msg string) []error {
var result []error
Walk(err, func(err error) {
if err.Error() == msg {
result = append(result, err)
}
})
return result
}
// GetAllType gets all the errors that are the same type as v.
//
// The order of the return value is the same as described in GetAll.
func GetAllType(err error, v interface{}) []error {
var result []error
var search string
if v != nil {
search = reflect.TypeOf(v).String()
}
Walk(err, func(err error) {
var needle string
if err != nil {
needle = reflect.TypeOf(err).String()
}
if needle == search {
result = append(result, err)
}
})
return result
}
// Walk walks all the wrapped errors in err and calls the callback. If
// err isn't a wrapped error, this will be called once for err. If err
// is a wrapped error, the callback will be called for both the wrapper
// that implements error as well as the wrapped error itself.
func Walk(err error, cb WalkFunc) {
if err == nil {
return
}
switch e := err.(type) {
case *wrappedError:
cb(e.Outer)
Walk(e.Inner, cb)
case Wrapper:
cb(err)
for _, err := range e.WrappedErrors() {
Walk(err, cb)
}
default:
cb(err)
}
}
// wrappedError is an implementation of error that has both the
// outer and inner errors.
type wrappedError struct {
Outer error
Inner error
}
func (w *wrappedError) Error() string {
return w.Outer.Error()
}
func (w *wrappedError) WrappedErrors() []error {
return []error{w.Outer, w.Inner}
}

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Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

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# cleanhttp
Functions for accessing "clean" Go http.Client values
-------------
The Go standard library contains a default `http.Client` called
`http.DefaultClient`. It is a common idiom in Go code to start with
`http.DefaultClient` and tweak it as necessary, and in fact, this is
encouraged; from the `http` package documentation:
> The Client's Transport typically has internal state (cached TCP connections),
so Clients should be reused instead of created as needed. Clients are safe for
concurrent use by multiple goroutines.
Unfortunately, this is a shared value, and it is not uncommon for libraries to
assume that they are free to modify it at will. With enough dependencies, it
can be very easy to encounter strange problems and race conditions due to
manipulation of this shared value across libraries and goroutines (clients are
safe for concurrent use, but writing values to the client struct itself is not
protected).
Making things worse is the fact that a bare `http.Client` will use a default
`http.Transport` called `http.DefaultTransport`, which is another global value
that behaves the same way. So it is not simply enough to replace
`http.DefaultClient` with `&http.Client{}`.
This repository provides some simple functions to get a "clean" `http.Client`
-- one that uses the same default values as the Go standard library, but
returns a client that does not share any state with other clients.

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package cleanhttp
import (
"net"
"net/http"
"time"
)
// DefaultTransport returns a new http.Transport with the same default values
// as http.DefaultTransport, but with idle connections and keepalives disabled.
func DefaultTransport() *http.Transport {
transport := DefaultPooledTransport()
transport.DisableKeepAlives = true
transport.MaxIdleConnsPerHost = -1
return transport
}
// DefaultPooledTransport returns a new http.Transport with similar default
// values to http.DefaultTransport. Do not use this for transient transports as
// it can leak file descriptors over time. Only use this for transports that
// will be re-used for the same host(s).
func DefaultPooledTransport() *http.Transport {
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
DisableKeepAlives: false,
MaxIdleConnsPerHost: 1,
}
return transport
}
// DefaultClient returns a new http.Client with similar default values to
// http.Client, but with a non-shared Transport, idle connections disabled, and
// keepalives disabled.
func DefaultClient() *http.Client {
return &http.Client{
Transport: DefaultTransport(),
}
}
// DefaultPooledClient returns a new http.Client with the same default values
// as http.Client, but with a shared Transport. Do not use this function
// for transient clients as it can leak file descriptors over time. Only use
// this for clients that will be re-used for the same host(s).
func DefaultPooledClient() *http.Client {
return &http.Client{
Transport: DefaultPooledTransport(),
}
}

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// Package cleanhttp offers convenience utilities for acquiring "clean"
// http.Transport and http.Client structs.
//
// Values set on http.DefaultClient and http.DefaultTransport affect all
// callers. This can have detrimental effects, esepcially in TLS contexts,
// where client or root certificates set to talk to multiple endpoints can end
// up displacing each other, leading to hard-to-debug issues. This package
// provides non-shared http.Client and http.Transport structs to ensure that
// the configuration will not be overwritten by other parts of the application
// or dependencies.
//
// The DefaultClient and DefaultTransport functions disable idle connections
// and keepalives. Without ensuring that idle connections are closed before
// garbage collection, short-term clients/transports can leak file descriptors,
// eventually leading to "too many open files" errors. If you will be
// connecting to the same hosts repeatedly from the same client, you can use
// DefaultPooledClient to receive a client that has connection pooling
// semantics similar to http.DefaultClient.
//
package cleanhttp

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Mozilla Public License, version 2.0
1. Definitions
1.1. “Contributor”
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. “Contributor Version”
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor’s Contribution.
1.3. “Contribution”
means Covered Software of a particular Contributor.
1.4. “Covered Software”
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. “Incompatible With Secondary Licenses”
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of version
1.1 or earlier of the License, but not also under the terms of a
Secondary License.
1.6. “Executable Form”
means any form of the work other than Source Code Form.
1.7. “Larger Work”
means a work that combines Covered Software with other material, in a separate
file or files, that is not Covered Software.
1.8. “License”
means this document.
1.9. “Licensable”
means having the right to grant, to the maximum extent possible, whether at the
time of the initial grant or subsequently, any and all of the rights conveyed by
this License.
1.10. “Modifications”
means any of the following:
a. any file in Source Code Form that results from an addition to, deletion
from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. “Patent Claims” of a Contributor
means any patent claim(s), including without limitation, method, process,
and apparatus claims, in any patent Licensable by such Contributor that
would be infringed, but for the grant of the License, by the making,
using, selling, offering for sale, having made, import, or transfer of
either its Contributions or its Contributor Version.
1.12. “Secondary License”
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. “Source Code Form”
means the form of the work preferred for making modifications.
1.14. “You” (or “Your”)
means an individual or a legal entity exercising rights under this
License. For legal entities, “You” includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, “control” means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or as
part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its Contributions
or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution become
effective for each Contribution on the date the Contributor first distributes
such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under this
License. No additional rights or licenses will be implied from the distribution
or licensing of Covered Software under this License. Notwithstanding Section
2.1(b) above, no patent license is granted by a Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party’s
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of its
Contributions.
This License does not grant any rights in the trademarks, service marks, or
logos of any Contributor (except as may be necessary to comply with the
notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this License
(see Section 10.2) or under the terms of a Secondary License (if permitted
under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its Contributions
are its original creation(s) or it has sufficient rights to grant the
rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under applicable
copyright doctrines of fair use, fair dealing, or other equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under the
terms of this License. You must inform recipients that the Source Code Form
of the Covered Software is governed by the terms of this License, and how
they can obtain a copy of this License. You may not attempt to alter or
restrict the recipients’ rights in the Source Code Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this License,
or sublicense it under different terms, provided that the license for
the Executable Form does not attempt to limit or alter the recipients’
rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for the
Covered Software. If the Larger Work is a combination of Covered Software
with a work governed by one or more Secondary Licenses, and the Covered
Software is not Incompatible With Secondary Licenses, this License permits
You to additionally distribute such Covered Software under the terms of
such Secondary License(s), so that the recipient of the Larger Work may, at
their option, further distribute the Covered Software under the terms of
either this License or such Secondary License(s).
3.4. Notices
You may not remove or alter the substance of any license notices (including
copyright notices, patent notices, disclaimers of warranty, or limitations
of liability) contained within the Source Code Form of the Covered
Software, except that You may alter any license notices to the extent
required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on behalf
of any Contributor. You must make it absolutely clear that any such
warranty, support, indemnity, or liability obligation is offered by You
alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute, judicial
order, or regulation then You must: (a) comply with the terms of this License
to the maximum extent possible; and (b) describe the limitations and the code
they affect. Such description must be placed in a text file included with all
distributions of the Covered Software under this License. Except to the
extent prohibited by statute or regulation, such description must be
sufficiently detailed for a recipient of ordinary skill to be able to
understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing basis,
if such Contributor fails to notify You of the non-compliance by some
reasonable means prior to 60 days after You have come back into compliance.
Moreover, Your grants from a particular Contributor are reinstated on an
ongoing basis if such Contributor notifies You of the non-compliance by
some reasonable means, this is the first time You have received notice of
non-compliance with this License from such Contributor, and You become
compliant prior to 30 days after Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions, counter-claims,
and cross-claims) alleging that a Contributor Version directly or
indirectly infringes any patent, then the rights granted to You by any and
all Contributors for the Covered Software under Section 2.1 of this License
shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an “as is” basis, without
warranty of any kind, either expressed, implied, or statutory, including,
without limitation, warranties that the Covered Software is free of defects,
merchantable, fit for a particular purpose or non-infringing. The entire
risk as to the quality and performance of the Covered Software is with You.
Should any Covered Software prove defective in any respect, You (not any
Contributor) assume the cost of any necessary servicing, repair, or
correction. This disclaimer of warranty constitutes an essential part of this
License. No use of any Covered Software is authorized under this License
except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from such
party’s negligence to the extent applicable law prohibits such limitation.
Some jurisdictions do not allow the exclusion or limitation of incidental or
consequential damages, so this exclusion and limitation may not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts of
a jurisdiction where the defendant maintains its principal place of business
and such litigation shall be governed by laws of that jurisdiction, without
reference to its conflict-of-law provisions. Nothing in this Section shall
prevent a party’s ability to bring cross-claims or counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject matter
hereof. If any provision of this License is held to be unenforceable, such
provision shall be reformed only to the extent necessary to make it
enforceable. Any law or regulation which provides that the language of a
contract shall be construed against the drafter shall not be used to construe
this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version of
the License under which You originally received the Covered Software, or
under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a modified
version of this License if you rename the license and remove any
references to the name of the license steward (except to note that such
modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file, then
You may include the notice in a location (such as a LICENSE file in a relevant
directory) where a recipient would be likely to look for such a notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - “Incompatible With Secondary Licenses” Notice
This Source Code Form is “Incompatible
With Secondary Licenses”, as defined by
the Mozilla Public License, v. 2.0.

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# go-multierror
`go-multierror` is a package for Go that provides a mechanism for
representing a list of `error` values as a single `error`.
This allows a function in Go to return an `error` that might actually
be a list of errors. If the caller knows this, they can unwrap the
list and access the errors. If the caller doesn't know, the error
formats to a nice human-readable format.
`go-multierror` implements the
[errwrap](https://github.com/hashicorp/errwrap) interface so that it can
be used with that library, as well.
## Installation and Docs
Install using `go get github.com/hashicorp/go-multierror`.
Full documentation is available at
http://godoc.org/github.com/hashicorp/go-multierror
## Usage
go-multierror is easy to use and purposely built to be unobtrusive in
existing Go applications/libraries that may not be aware of it.
**Building a list of errors**
The `Append` function is used to create a list of errors. This function
behaves a lot like the Go built-in `append` function: it doesn't matter
if the first argument is nil, a `multierror.Error`, or any other `error`,
the function behaves as you would expect.
```go
var result error
if err := step1(); err != nil {
result = multierror.Append(result, err)
}
if err := step2(); err != nil {
result = multierror.Append(result, err)
}
return result
```
**Customizing the formatting of the errors**
By specifying a custom `ErrorFormat`, you can customize the format
of the `Error() string` function:
```go
var result *multierror.Error
// ... accumulate errors here, maybe using Append
if result != nil {
result.ErrorFormat = func([]error) string {
return "errors!"
}
}
```
**Accessing the list of errors**
`multierror.Error` implements `error` so if the caller doesn't know about
multierror, it will work just fine. But if you're aware a multierror might
be returned, you can use type switches to access the list of errors:
```go
if err := something(); err != nil {
if merr, ok := err.(*multierror.Error); ok {
// Use merr.Errors
}
}
```
**Returning a multierror only if there are errors**
If you build a `multierror.Error`, you can use the `ErrorOrNil` function
to return an `error` implementation only if there are errors to return:
```go
var result *multierror.Error
// ... accumulate errors here
// Return the `error` only if errors were added to the multierror, otherwise
// return nil since there are no errors.
return result.ErrorOrNil()
```

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package multierror
// Append is a helper function that will append more errors
// onto an Error in order to create a larger multi-error.
//
// If err is not a multierror.Error, then it will be turned into
// one. If any of the errs are multierr.Error, they will be flattened
// one level into err.
func Append(err error, errs ...error) *Error {
switch err := err.(type) {
case *Error:
// Typed nils can reach here, so initialize if we are nil
if err == nil {
err = new(Error)
}
// Go through each error and flatten
for _, e := range errs {
switch e := e.(type) {
case *Error:
err.Errors = append(err.Errors, e.Errors...)
default:
err.Errors = append(err.Errors, e)
}
}
return err
default:
newErrs := make([]error, 0, len(errs)+1)
if err != nil {
newErrs = append(newErrs, err)
}
newErrs = append(newErrs, errs...)
return Append(&Error{}, newErrs...)
}
}

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package multierror
// Flatten flattens the given error, merging any *Errors together into
// a single *Error.
func Flatten(err error) error {
// If it isn't an *Error, just return the error as-is
if _, ok := err.(*Error); !ok {
return err
}
// Otherwise, make the result and flatten away!
flatErr := new(Error)
flatten(err, flatErr)
return flatErr
}
func flatten(err error, flatErr *Error) {
switch err := err.(type) {
case *Error:
for _, e := range err.Errors {
flatten(e, flatErr)
}
default:
flatErr.Errors = append(flatErr.Errors, err)
}
}

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package multierror
import (
"fmt"
"strings"
)
// ErrorFormatFunc is a function callback that is called by Error to
// turn the list of errors into a string.
type ErrorFormatFunc func([]error) string
// ListFormatFunc is a basic formatter that outputs the number of errors
// that occurred along with a bullet point list of the errors.
func ListFormatFunc(es []error) string {
points := make([]string, len(es))
for i, err := range es {
points[i] = fmt.Sprintf("* %s", err)
}
return fmt.Sprintf(
"%d error(s) occurred:\n\n%s",
len(es), strings.Join(points, "\n"))
}

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package multierror
import (
"fmt"
)
// Error is an error type to track multiple errors. This is used to
// accumulate errors in cases and return them as a single "error".
type Error struct {
Errors []error
ErrorFormat ErrorFormatFunc
}
func (e *Error) Error() string {
fn := e.ErrorFormat
if fn == nil {
fn = ListFormatFunc
}
return fn(e.Errors)
}
// ErrorOrNil returns an error interface if this Error represents
// a list of errors, or returns nil if the list of errors is empty. This
// function is useful at the end of accumulation to make sure that the value
// returned represents the existence of errors.
func (e *Error) ErrorOrNil() error {
if e == nil {
return nil
}
if len(e.Errors) == 0 {
return nil
}
return e
}
func (e *Error) GoString() string {
return fmt.Sprintf("*%#v", *e)
}
// WrappedErrors returns the list of errors that this Error is wrapping.
// It is an implementatin of the errwrap.Wrapper interface so that
// multierror.Error can be used with that library.
//
// This method is not safe to be called concurrently and is no different
// than accessing the Errors field directly. It is implementd only to
// satisfy the errwrap.Wrapper interface.
func (e *Error) WrappedErrors() []error {
return e.Errors
}

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package multierror
import (
"fmt"
"github.com/hashicorp/errwrap"
)
// Prefix is a helper function that will prefix some text
// to the given error. If the error is a multierror.Error, then
// it will be prefixed to each wrapped error.
//
// This is useful to use when appending multiple multierrors
// together in order to give better scoping.
func Prefix(err error, prefix string) error {
if err == nil {
return nil
}
format := fmt.Sprintf("%s {{err}}", prefix)
switch err := err.(type) {
case *Error:
// Typed nils can reach here, so initialize if we are nil
if err == nil {
err = new(Error)
}
// Wrap each of the errors
for i, e := range err.Errors {
err.Errors[i] = errwrap.Wrapf(format, e)
}
return err
default:
return errwrap.Wrapf(format, err)
}
}

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sudo: false
language: go
go:
- 1.6
branches:
only:
- master
script: make test

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Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

8
vendor/github.com/hashicorp/go-rootcerts/Makefile generated vendored Normal file
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@ -0,0 +1,8 @@
TEST?=./...
test:
go test $(TEST) $(TESTARGS) -timeout=3s -parallel=4
go vet $(TEST)
go test $(TEST) -race
.PHONY: test

43
vendor/github.com/hashicorp/go-rootcerts/README.md generated vendored Normal file
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# rootcerts
Functions for loading root certificates for TLS connections.
-----
Go's standard library `crypto/tls` provides a common mechanism for configuring
TLS connections in `tls.Config`. The `RootCAs` field on this struct is a pool
of certificates for the client to use as a trust store when verifying server
certificates.
This library contains utility functions for loading certificates destined for
that field, as well as one other important thing:
When the `RootCAs` field is `nil`, the standard library attempts to load the
host's root CA set. This behavior is OS-specific, and the Darwin
implementation contains [a bug that prevents trusted certificates from the
System and Login keychains from being loaded][1]. This library contains
Darwin-specific behavior that works around that bug.
[1]: https://github.com/golang/go/issues/14514
## Example Usage
Here's a snippet demonstrating how this library is meant to be used:
```go
func httpClient() (*http.Client, error)
tlsConfig := &tls.Config{}
err := rootcerts.ConfigureTLS(tlsConfig, &rootcerts.Config{
CAFile: os.Getenv("MYAPP_CAFILE"),
CAPath: os.Getenv("MYAPP_CAPATH"),
})
if err != nil {
return nil, err
}
c := cleanhttp.DefaultClient()
t := cleanhttp.DefaultTransport()
t.TLSClientConfig = tlsConfig
c.Transport = t
return c, nil
}
```

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