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Initial implementation (#1)

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Initial implementation
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Knut Ahlers 2019-06-29 22:51:18 +02:00 committed by GitHub
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config.yaml
dev_test

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FROM golang:alpine as builder
ENV GO111MODULE=on
COPY . /go/src/github.com/Luzifer/cloudbox
WORKDIR /go/src/github.com/Luzifer/cloudbox
RUN set -ex \
&& apk add --update \
build-base \
git \
sqlite \
&& go install -ldflags "-X main.version=$(git describe --tags --always || echo dev)" \
github.com/Luzifer/cloudbox/cmd/cloudbox
FROM alpine:latest
LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
RUN set -ex \
&& apk --no-cache add \
ca-certificates \
sqlite
COPY --from=builder /go/bin/cloudbox /usr/local/bin/cloudbox
ENTRYPOINT ["/usr/local/bin/cloudbox"]
CMD ["--"]
# vim: set ft=Dockerfile:

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Copyright 2019- 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.
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[![Go Report Card](https://goreportcard.com/badge/github.com/Luzifer/cloudbox)](https://goreportcard.com/report/github.com/Luzifer/cloudbox)
![](https://badges.fyi/github/license/Luzifer/cloudbox)
![](https://badges.fyi/github/downloads/Luzifer/cloudbox)
![](https://badges.fyi/github/latest-release/Luzifer/cloudbox)
# Luzifer / cloudbox
cloudbox is a bidirectional sync provider for local dirs and a remote provider like a S3 bucket. Changes are detected through file attributes (size, modification time) or if supported by the remote provider through checksums.

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package main
import (
"os"
"time"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
"github.com/Luzifer/cloudbox/sync"
)
type shareConfig struct {
OverrideURI bool `yaml:"override_uri"`
URITemplate string `yaml:"uri_template"`
}
type syncConfig struct {
LocalDir string `yaml:"local_dir"`
RemoteURI string `yaml:"remote_uri"`
Settings sync.Config `yaml:"settings"`
}
type configFile struct {
ControlDir string `yaml:"control_dir"`
Sync syncConfig `yaml:"sync"`
Share shareConfig `yaml:"share"`
}
func (c configFile) validate() error {
if c.Sync.LocalDir == "" {
return errors.New("Local directory not specified")
}
if c.Sync.RemoteURI == "" {
return errors.New("Remote sync URI not specified")
}
if c.Share.OverrideURI && c.Share.URITemplate == "" {
return errors.New("Share URI override enabled but no template specified")
}
return nil
}
func defaultConfig() *configFile {
return &configFile{
ControlDir: "~/.cache/cloudbox",
Sync: syncConfig{
Settings: sync.Config{
ScanInterval: time.Minute,
},
},
}
}
func execWriteSampleConfig() error {
conf := defaultConfig()
if _, err := os.Stat(cfg.Config); err == nil {
if conf, err = loadConfig(true); err != nil {
return errors.Wrap(err, "Unable to load existing config")
}
}
f, err := os.Create(cfg.Config)
if err != nil {
return errors.Wrap(err, "Unable to create config file")
}
defer f.Close()
f.WriteString("---\n\n")
if err := yaml.NewEncoder(f).Encode(conf); err != nil {
return errors.Wrap(err, "Unable to write config file")
}
f.WriteString("\n...\n")
log.WithField("dest", cfg.Config).Info("Config written")
return nil
}
func loadConfig(noValidate bool) (*configFile, error) {
config := defaultConfig()
f, err := os.Open(cfg.Config)
if err != nil {
return nil, errors.Wrap(err, "Unable to open config file")
}
defer f.Close()
if err = yaml.NewDecoder(f).Decode(config); err != nil {
return nil, errors.Wrap(err, "Unable to decode config")
}
if noValidate {
return config, nil
}
return config, config.validate()
}

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package main
import (
"fmt"
"github.com/Luzifer/rconfig"
)
const helpText = `
Available commands:
help Display this message
share Shares a file and returns its URL when supported
sync Executes the bi-directional sync
write-config Write a sample configuration to specified location
`
func execHelp() error {
rconfig.Usage()
fmt.Print(helpText)
return nil
}

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package main
import (
"fmt"
"os"
"github.com/mitchellh/go-homedir"
log "github.com/sirupsen/logrus"
"github.com/Luzifer/rconfig"
)
type command string
type commandFunc func() error
const (
cmdHelp command = "help"
cmdShare command = "share"
cmdSync command = "sync"
cmdWriteConfig command = "write-config"
)
var cmdFuncs = map[command]commandFunc{
cmdShare: execShare,
cmdSync: execSync,
cmdWriteConfig: execWriteSampleConfig,
}
var (
cfg = struct {
Config string `flag:"config,c" default:"config.yaml" description:"Configuration file location"`
Force bool `flag:"force,f" default:"false" description:"Force operation"`
LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
}{}
version = "dev"
)
func init() {
if err := rconfig.ParseAndValidate(&cfg); err != nil {
log.Fatalf("Unable to parse commandline options: %s", err)
}
if cfg.VersionAndExit {
fmt.Printf("cloudbox %s\n", version)
os.Exit(0)
}
if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
log.WithError(err).Fatal("Unable to parse log level")
} else {
log.SetLevel(l)
}
if dir, err := homedir.Expand(cfg.Config); err != nil {
log.WithError(err).Fatal("Unable to expand config path")
} else {
cfg.Config = dir
}
}
func main() {
cmd := cmdHelp
if len(rconfig.Args()) > 1 {
cmd = command(rconfig.Args()[1])
}
var cmdFunc commandFunc = execHelp
if f, ok := cmdFuncs[cmd]; ok {
cmdFunc = f
}
log.WithField("version", version).Info("cloudbox started")
if err := cmdFunc(); err != nil {
log.WithError(err).Fatal("Command execution failed")
}
}

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package main
import (
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
"github.com/Luzifer/cloudbox/providers/local"
"github.com/Luzifer/cloudbox/providers/s3"
)
var providerInitFuncs = []providers.CloudProviderInitFunc{
local.New,
s3.New,
}
func providerFromURI(uri string) (providers.CloudProvider, error) {
if uri == "" {
return nil, errors.New("Empty provider URI")
}
for _, f := range providerInitFuncs {
cp, err := f(uri)
switch err {
case nil:
if !cp.Capabilities().Has(providers.CapBasic) {
return nil, errors.Errorf("Provider %s does not support basic capabilities", cp.Name())
}
return cp, nil
case providers.ErrInvalidURI:
// Fine for now, try next one
default:
return nil, errors.Wrap(err, "Unable to initialize provider")
}
}
return nil, errors.Errorf("No provider found for URI %q", uri)
}

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package main
import (
"fmt"
"os"
"text/template"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
"github.com/Luzifer/rconfig"
)
func execShare() error {
conf, err := loadConfig(false)
if err != nil {
return errors.Wrap(err, "Unable to load config")
}
remote, err := providerFromURI(conf.Sync.RemoteURI)
if err != nil {
return errors.Wrap(err, "Unable to initialize remote provider")
}
if !remote.Capabilities().Has(providers.CapShare) {
return errors.New("Remote provider does not support sharing")
}
if len(rconfig.Args()) < 3 {
return errors.New("No filename provided to share")
}
relativeName := rconfig.Args()[2]
providerURL, err := remote.Share(relativeName)
if err != nil {
return errors.Wrap(err, "Unable to share file")
}
if !conf.Share.OverrideURI {
fmt.Println(providerURL)
return nil
}
tpl, err := template.New("share_uri").Parse(conf.Share.URITemplate)
if err != nil {
return errors.Wrap(err, "Unable to parse URI template")
}
if err := tpl.Execute(os.Stdout, map[string]interface{}{
"file": relativeName,
}); err != nil {
return errors.Wrap(err, "Unable to render share URI")
}
return nil
}

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package main
import (
"database/sql"
"os"
"os/signal"
"path"
"syscall"
_ "github.com/mattn/go-sqlite3"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/Luzifer/cloudbox/sync"
)
func execSync() error {
conf, err := loadConfig(false)
if err != nil {
return errors.Wrap(err, "Unable to load config")
}
local, err := providerFromURI("file://" + conf.Sync.LocalDir)
if err != nil {
return errors.Wrap(err, "Unable to initialize local provider")
}
remote, err := providerFromURI(conf.Sync.RemoteURI)
if err != nil {
return errors.Wrap(err, "Unable to initialize remote provider")
}
if err := os.MkdirAll(conf.ControlDir, 0700); err != nil {
return errors.Wrap(err, "Unable to create control dir")
}
db, err := sql.Open("sqlite3", path.Join(conf.ControlDir, "sync.db"))
if err != nil {
return errors.Wrap(err, "Unable to establish database connection")
}
s := sync.New(local, remote, db, conf.Sync.Settings, log.NewEntry(log.StandardLogger()))
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGINT, syscall.SIGTERM)
go func() {
for range sigchan {
s.Stop()
}
}()
log.Info("Starting sync run...")
return errors.Wrap(s.Run(), "Unable to sync")
}

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module github.com/Luzifer/cloudbox
go 1.12
require (
github.com/Luzifer/rconfig v2.2.0+incompatible
github.com/aws/aws-sdk-go v1.20.12
github.com/mattn/go-sqlite3 v1.10.0
github.com/mitchellh/go-homedir v1.1.0
github.com/pkg/errors v0.8.1
github.com/sirupsen/logrus v1.4.2
github.com/spf13/pflag v1.0.3 // indirect
gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 // indirect
gopkg.in/yaml.v2 v2.2.2
)

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github.com/Luzifer/rconfig v2.2.0+incompatible h1:Kle3+rshPM7LxciOheaR4EfHUzibkDDGws04sefQ5m8=
github.com/Luzifer/rconfig v2.2.0+incompatible/go.mod h1:9pet6z2+mm/UAB0jF/rf0s62USfHNolzgR6Q4KpsJI0=
github.com/aws/aws-sdk-go v1.20.12 h1:xV7xfLSkiqd7JOnLlfER+Jz8kI98rAGJvtXssYkCRs4=
github.com/aws/aws-sdk-go v1.20.12/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM=
github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/mattn/go-sqlite3 v1.10.0 h1:jbhqpg7tQe4SupckyijYiy0mJJ/pRyHvXf7JdWK860o=
github.com/mattn/go-sqlite3 v1.10.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 h1:WB265cn5OpO+hK3pikC9hpP1zI/KTwmyMFKloW9eOVc=
gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

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package providers
import (
"hash"
"io"
"time"
"github.com/pkg/errors"
)
var ErrFileNotFound = errors.New("File not found")
type File interface {
Info() FileInfo
Checksum(hash.Hash) (string, error)
Content() (io.ReadCloser, error)
}
type FileInfo struct {
RelativeName string
LastModified time.Time
Checksum string // Expected to be present on CapAutoChecksum
Size uint64
}
func (f *FileInfo) Equal(other *FileInfo) bool {
if f == nil && other == nil {
// Both are not present: No change
return true
}
if (f != nil && other == nil) || (f == nil && other != nil) {
// One is not present, the other is: Change
return false
}
if (f.Checksum != "" || other.Checksum != "") && f.Checksum != other.Checksum {
// Checksum is present in one, doesn't match: Change
return false
}
if f.Size != other.Size {
// No checksums present, size differs: Change
return false
}
if !f.LastModified.Equal(other.LastModified) {
// LastModified date differs: Change
return false
}
// No changes detected yet: No change
return true
}

35
providers/interface.go Normal file
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package providers
import (
"hash"
"github.com/pkg/errors"
)
type Capability uint8
const (
CapBasic Capability = 1 << iota
CapShare
CapAutoChecksum
)
func (c Capability) Has(test Capability) bool { return c&test != 0 }
var (
ErrInvalidURI = errors.New("Spefified URI is invalid for this provider")
ErrFeatureNotSupported = errors.New("Feature not supported")
)
type CloudProviderInitFunc func(string) (CloudProvider, error)
type CloudProvider interface {
Capabilities() Capability
DeleteFile(relativeName string) error
GetChecksumMethod() hash.Hash
GetFile(relativeName string) (File, error)
ListFiles() ([]File, error)
Name() string
PutFile(File) (File, error)
Share(relativeName string) (string, error)
}

46
providers/local/file.go Normal file
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package local
import (
"bytes"
"fmt"
"hash"
"io"
"os"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
type File struct {
info os.FileInfo
relativeName string
fullPath string
}
func (f File) Info() providers.FileInfo {
return providers.FileInfo{
RelativeName: f.relativeName,
LastModified: f.info.ModTime(),
Size: uint64(f.info.Size()),
}
}
func (f File) Checksum(h hash.Hash) (string, error) {
fc, err := f.Content()
if err != nil {
return "", errors.Wrap(err, "Unable to get file contents")
}
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, fc); err != nil {
return "", errors.Wrap(err, "Unable to read file contents")
}
return fmt.Sprintf("%x", h.Sum(buf.Bytes())), nil
}
func (f File) Content() (io.ReadCloser, error) {
fp, err := os.Open(f.fullPath)
return fp, errors.Wrap(err, "Unable to open file")
}

120
providers/local/provider.go Normal file
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package local
import (
"crypto/sha256"
"hash"
"io"
"os"
"path"
"path/filepath"
"strings"
"time"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
func New(uri string) (providers.CloudProvider, error) {
if !strings.HasPrefix(uri, "file://") {
return nil, providers.ErrInvalidURI
}
return &Provider{directory: strings.TrimPrefix(uri, "file://")}, nil
}
type Provider struct {
directory string
}
func (p Provider) Capabilities() providers.Capability { return providers.CapBasic }
func (p Provider) Name() string { return "local" }
func (p Provider) GetChecksumMethod() hash.Hash { return sha256.New() }
func (p Provider) ListFiles() ([]providers.File, error) {
var (
absPath string
err error
files []providers.File
)
if absPath, err = filepath.Abs(p.directory); err != nil {
return nil, errors.Wrap(err, "Unable to calculate absolute path")
}
err = filepath.Walk(absPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
// We behave like git: We don't care about dirs themselves
return nil
}
files = append(files, File{
info: info,
relativeName: strings.TrimLeft(strings.TrimPrefix(path, absPath), "/"),
fullPath: path,
})
return nil
})
return files, errors.Wrap(err, "File listing failed")
}
func (p Provider) DeleteFile(relativeName string) error {
return os.Remove(path.Join(p.directory, relativeName))
}
func (p Provider) GetFile(relativeName string) (providers.File, error) {
fullPath := path.Join(p.directory, relativeName)
stat, err := os.Stat(fullPath)
if err != nil {
if os.IsNotExist(err) {
return nil, providers.ErrFileNotFound
}
return nil, errors.Wrap(err, "Unable to get file stat")
}
return File{
info: stat,
relativeName: relativeName,
fullPath: fullPath,
}, nil
}
func (p Provider) PutFile(f providers.File) (providers.File, error) {
fullPath := path.Join(p.directory, f.Info().RelativeName)
fp, err := os.Create(fullPath)
if err != nil {
return nil, errors.Wrap(err, "Unable to create file")
}
rfp, err := f.Content()
if err != nil {
return nil, errors.Wrap(err, "Unable to get remote file content")
}
defer rfp.Close()
if _, err := io.Copy(fp, rfp); err != nil {
return nil, errors.Wrap(err, "Unable to copy file contents")
}
if err := fp.Close(); err != nil {
return nil, errors.Wrap(err, "Unable to close local file")
}
if err := os.Chtimes(fullPath, time.Now(), f.Info().LastModified); err != nil {
return nil, errors.Wrap(err, "Unable to set last file mod time")
}
return p.GetFile(f.Info().RelativeName)
}
func (p Provider) Share(relativeName string) (string, error) {
return "", providers.ErrFeatureNotSupported
}

61
providers/s3/file.go Normal file
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package s3
import (
"bytes"
"fmt"
"hash"
"io"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
type File struct {
key string
lastModified time.Time
checksum string
size uint64
s3Conn *s3.S3
bucket string
}
func (f File) Info() providers.FileInfo {
return providers.FileInfo{
RelativeName: f.key,
LastModified: f.lastModified,
Checksum: f.checksum,
Size: f.size,
}
}
func (f File) Checksum(h hash.Hash) (string, error) {
cont, err := f.Content()
if err != nil {
return "", errors.Wrap(err, "Unable to get file content")
}
defer cont.Close()
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, cont); err != nil {
return "", errors.Wrap(err, "Unable to read file content")
}
return fmt.Sprintf("%x", h.Sum(buf.Bytes())), nil
}
func (f File) Content() (io.ReadCloser, error) {
resp, err := f.s3Conn.GetObject(&s3.GetObjectInput{
Bucket: aws.String(f.bucket),
Key: aws.String(f.key),
})
if err != nil {
return nil, errors.Wrap(err, "Unable to get file")
}
return resp.Body, nil
}

177
providers/s3/provider.go Normal file
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package s3
import (
"bytes"
"context"
"crypto/md5"
"fmt"
"hash"
"io"
"net/url"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
type Provider struct {
bucket string
bucketRegion string
s3 *s3.S3
}
func New(uri string) (providers.CloudProvider, error) {
if !strings.HasPrefix(uri, "s3://") {
return nil, providers.ErrInvalidURI
}
u, err := url.Parse(uri)
if err != nil {
return nil, errors.Wrap(err, "Invalid URI specified")
}
region, err := s3manager.GetBucketRegion(context.Background(), session.New(), u.Host, "us-east-1")
if err != nil {
return nil, errors.Wrap(err, "Unable to find bucket region")
}
cfg := aws.NewConfig().WithRegion(region)
if u.User != nil {
user := u.User.Username()
pass, _ := u.User.Password()
cfg = cfg.WithCredentials(credentials.NewStaticCredentials(user, pass, ""))
}
sess := session.Must(session.NewSession(cfg))
svc := s3.New(sess)
return &Provider{
bucket: u.Host,
bucketRegion: region,
s3: svc,
}, nil
}
func (p *Provider) Capabilities() providers.Capability {
return providers.CapBasic | providers.CapAutoChecksum | providers.CapShare
}
func (p *Provider) Name() string { return "s3" }
func (p *Provider) GetChecksumMethod() hash.Hash { return md5.New() }
func (p *Provider) DeleteFile(relativeName string) error {
_, err := p.s3.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(p.bucket),
Key: aws.String(relativeName),
})
return errors.Wrap(err, "Unable to delete object")
}
func (p *Provider) GetFile(relativeName string) (providers.File, error) {
resp, err := p.s3.HeadObject(&s3.HeadObjectInput{
Bucket: aws.String(p.bucket),
Key: aws.String(relativeName),
})
if err != nil {
return nil, errors.Wrap(err, "Unable to fetch head information")
}
return File{
key: relativeName,
lastModified: *resp.LastModified,
checksum: strings.Trim(*resp.ETag, `"`),
size: uint64(*resp.ContentLength),
s3Conn: p.s3,
bucket: p.bucket,
}, nil
}
func (p *Provider) ListFiles() ([]providers.File, error) {
var files []providers.File
err := p.s3.ListObjectsPages(&s3.ListObjectsInput{
Bucket: aws.String(p.bucket),
}, func(out *s3.ListObjectsOutput, lastPage bool) bool {
for _, obj := range out.Contents {
files = append(files, File{
key: *obj.Key,
lastModified: *obj.LastModified,
checksum: strings.Trim(*obj.ETag, `"`),
size: uint64(*obj.Size),
s3Conn: p.s3,
bucket: p.bucket,
})
}
return !lastPage
})
return files, errors.Wrap(err, "Unable to list objects")
}
func (p *Provider) PutFile(f providers.File) (providers.File, error) {
body, err := f.Content()
if err != nil {
return nil, errors.Wrap(err, "Unable to get file reader")
}
defer body.Close()
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, body); err != nil {
return nil, errors.Wrap(err, "Unable to read source file")
}
if _, err = p.s3.PutObject(&s3.PutObjectInput{
ACL: aws.String(p.getFileACL(f.Info().RelativeName)),
Body: bytes.NewReader(buf.Bytes()),
Bucket: aws.String(p.bucket),
Key: aws.String(f.Info().RelativeName),
}); err != nil {
return nil, errors.Wrap(err, "Unable to write file")
}
return p.GetFile(f.Info().RelativeName)
}
func (p *Provider) Share(relativeName string) (string, error) {
_, err := p.s3.PutObjectAcl(&s3.PutObjectAclInput{
ACL: aws.String(s3.ObjectCannedACLPublicRead),
Bucket: aws.String(p.bucket),
Key: aws.String(relativeName),
})
if err != nil {
return "", errors.Wrap(err, "Unable to publish file")
}
return fmt.Sprintf("https://s3-%s.amazonaws.com/%s/%s", p.bucketRegion, p.bucket, relativeName), nil
}
func (p *Provider) getFileACL(relativeName string) string {
objACL, err := p.s3.GetObjectAcl(&s3.GetObjectAclInput{
Bucket: aws.String(p.bucket),
Key: aws.String(relativeName),
})
if err != nil {
return s3.ObjectCannedACLPrivate
}
for _, g := range objACL.Grants {
if g.Grantee == nil || g.Grantee.URI == nil {
continue
}
if *g.Grantee.URI == "http://acs.amazonaws.com/groups/global/AllUsers" && *g.Permission == "READ" {
return s3.ObjectCannedACLPublicRead
}
}
return s3.ObjectCannedACLPrivate
}

69
sync/change.go Normal file
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package sync
import "strings"
type Change uint8
const (
ChangeLocalAdd Change = 1 << iota
ChangeLocalDelete
ChangeLocalUpdate
ChangeRemoteAdd
ChangeRemoteDelete
ChangeRemoteUpdate
)
var changeNameMap = map[Change]string{
ChangeLocalAdd: "local-add",
ChangeLocalDelete: "local-delete",
ChangeLocalUpdate: "local-update",
ChangeRemoteAdd: "remote-add",
ChangeRemoteDelete: "remote-delete",
ChangeRemoteUpdate: "remote-update",
}
func (c Change) Changed() bool {
return c != 0
}
func (c *Change) Register(add Change) {
*c |= add
}
func (c Change) HasAll(test ...Change) bool {
for _, t := range test {
if c&t == 0 {
return false
}
}
return true
}
func (c Change) HasOne(test ...Change) bool {
for _, t := range test {
if c&t != 0 {
return true
}
}
return false
}
func (c Change) Is(test Change) bool {
return c == test
}
func (c Change) String() string {
if !c.Changed() {
return "none"
}
names := []string{}
for k, v := range changeNameMap {
if c.HasOne(k) {
names = append(names, v)
}
}
return strings.Join(names, ", ")
}

77
sync/db.go Normal file
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package sync
import (
"fmt"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
const schema = `
CREATE TABLE IF NOT EXISTS local_state (
relative_name TEXT PRIMARY KEY,
last_modified DATETIME,
checksum TEXT,
size INT
);
CREATE TABLE IF NOT EXISTS remote_state (
relative_name TEXT PRIMARY KEY,
last_modified DATETIME,
checksum TEXT,
size INT
);
`
func (s *Sync) initSchema() error {
_, err := s.db.Exec(schema)
return err
}
func (s *Sync) deleteDBFileInfo(side, relativeName string) error {
// #nosec G201 - fmt is only used to prefix a table with a constant, no user input
stmt, err := s.db.Prepare(fmt.Sprintf(`DELETE FROM %s_state WHERE relative_name = ?`, side))
if err != nil {
return errors.Wrap(err, "Unable to prepare query")
}
_, err = stmt.Exec(relativeName)
return errors.Wrap(err, "Unable to delete file info")
}
func (s *Sync) setDBFileInfo(side string, info providers.FileInfo) error {
// #nosec G201 - fmt is only used to prefix a table with a constant, no user input
stmt, err := s.db.Prepare(fmt.Sprintf(
`INSERT INTO %s_state VALUES(?, ?, ?, ?)
ON CONFLICT(relative_name) DO UPDATE SET
last_modified=excluded.last_modified,
checksum=excluded.checksum,
size=excluded.size`, side))
if err != nil {
return errors.Wrap(err, "Unable to prepare query")
}
_, err = stmt.Exec(info.RelativeName, info.LastModified, info.Checksum, info.Size)
return errors.Wrap(err, "Unable to upsert file info")
}
func (s *Sync) updateStateFromDatabase(st *state) error {
for _, table := range []string{sideLocal, sideRemote} {
// #nosec G201 - fmt is only used to prefix a table with a constant, no user input
rows, err := s.db.Query(fmt.Sprintf("SELECT * FROM %s_state", table))
if err != nil {
return errors.Wrapf(err, "Unable to query table %s", table)
}
defer rows.Close()
for rows.Next() {
info := providers.FileInfo{}
if err = rows.Scan(&info.RelativeName, &info.LastModified, &info.Checksum, &info.Size); err != nil {
return errors.Wrap(err, "Unable to read response")
}
st.Set(table, sourceDB, info)
}
}
return nil
}

106
sync/execute.go Normal file
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package sync
import (
"crypto/sha256"
"github.com/pkg/errors"
"github.com/Luzifer/cloudbox/providers"
)
func (s *Sync) addBothCreated(fileName string) error {
// Use forced sha256 to ensure lesser chance for collision
var hashMethod = sha256.New()
local, err := s.local.GetFile(fileName)
if err != nil {
return errors.Wrap(err, "Unable to retrieve file from local")
}
remote, err := s.remote.GetFile(fileName)
if err != nil {
return errors.Wrap(err, "Unable to retrieve file from remote")
}
localSum, err := local.Checksum(hashMethod)
if err != nil {
return errors.Wrap(err, "Unable to get checksum from local file")
}
remoteSum, err := remote.Checksum(hashMethod)
if err != nil {
return errors.Wrap(err, "Unable to get checksum from remote file")
}
if localSum != remoteSum {
return errors.New("Checksums differ")
}
localInfo, err := s.getFileInfo(local)
if err != nil {
return errors.Wrap(err, "Unable to get file info for local file")
}
if err := s.setDBFileInfo(sideLocal, localInfo); err != nil {
return errors.Wrap(err, "Unable to update DB info for local file")
}
remoteInfo, err := s.getFileInfo(remote)
if err != nil {
return errors.Wrap(err, "Unable to get file info for remote file")
}
if err := s.setDBFileInfo(sideRemote, remoteInfo); err != nil {
return errors.Wrap(err, "Unable to update DB info for remote file")
}
return nil
}
func (s *Sync) deleteFile(on providers.CloudProvider, fileName string) error {
if err := on.DeleteFile(fileName); err != nil {
return errors.Wrap(err, "Unable to delete file")
}
if err := s.deleteDBFileInfo(sideLocal, fileName); err != nil {
return errors.Wrap(err, "Umable to delete local file info")
}
if err := s.deleteDBFileInfo(sideRemote, fileName); err != nil {
return errors.Wrap(err, "Umable to delete remote file info")
}
return nil
}
func (s *Sync) transferFile(from, to providers.CloudProvider, sideFrom, sideTo, fileName string) error {
file, err := from.GetFile(fileName)
if err != nil {
return errors.Wrap(err, "Unable to retrieve file")
}
newFile, err := to.PutFile(file)
if err != nil {
return errors.Wrap(err, "Unable to put file")
}
newFileInfo, err := s.getFileInfo(newFile)
if err != nil {
return errors.Wrap(err, "Unable to get file info for target file")
}
if err := s.setDBFileInfo(sideTo, newFileInfo); err != nil {
return errors.Wrap(err, "Unable to update DB info for target file")
}
fileInfo, err := s.getFileInfo(file)
if err != nil {
return errors.Wrap(err, "Unable to get file info for source file")
}
if err := s.setDBFileInfo(sideFrom, fileInfo); err != nil {
return errors.Wrap(err, "Unable to update DB info for source file")
}
return nil
}

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sync/logic.go Normal file
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package sync
import log "github.com/sirupsen/logrus"
func (s *Sync) decideAction(syncState *state, fileName string) error {
var (
change = syncState.GetChangeFor(fileName)
logger = log.WithField("filename", fileName)
)
switch {
case !change.Changed():
// No changes at all: Get out of here
logger.Debug("File in sync")
return nil
case change.HasAll(ChangeLocalUpdate, ChangeRemoteUpdate):
// We do have local and remote changes: Check both are now the same or leave this to manual resolve
logger.Warn("File has local and remote updates, sync not possible")
case change.HasAll(ChangeLocalAdd, ChangeRemoteAdd):
// Special case: Both are added, check they are the same file or leave this to manual resolve
logger.Debug("File added locally as well as remotely")
if err := s.addBothCreated(fileName); err != nil {
logger.WithError(err).Error("Unable to add locally as well as remotely added file")
}
case change.HasAll(ChangeLocalDelete, ChangeRemoteDelete):
// Special case: Both vanished, we just need to clean up the sync cache
logger.Debug("File deleted locally as well as remotely")
if err := s.deleteDBFileInfo(sideLocal, fileName); err != nil {
logger.WithError(err).Error("Unable to delete local file info")
return nil
}
if err := s.deleteDBFileInfo(sideRemote, fileName); err != nil {
logger.WithError(err).Error("Unable to delete remote file info")
return nil
}
case change.Is(ChangeLocalAdd) || change.Is(ChangeLocalUpdate):
logger.Debug("File added or changed locally, uploading...")
if err := s.transferFile(s.local, s.remote, sideLocal, sideRemote, fileName); err != nil {
logger.WithError(err).Error("Unable to upload file")
}
case change.Is(ChangeLocalDelete):
logger.Debug("File deleted locally, removing from remote...")
if err := s.deleteFile(s.remote, fileName); err != nil {
logger.WithError(err).Error("Unable to delete file from remote")
}
case change.Is(ChangeRemoteAdd) || change.Is(ChangeRemoteUpdate):
logger.Debug("File added or changed remotely, downloading...")
if err := s.transferFile(s.remote, s.local, sideRemote, sideLocal, fileName); err != nil {
logger.WithError(err).Error("Unable to download file")
}
case change.Is(ChangeRemoteDelete):
logger.Debug("File deleted remotely, removing from local...")
if err := s.deleteFile(s.local, fileName); err != nil {
logger.WithError(err).Error("Unable to delete file from local")
}
default:
// Unhandled case (i.e. human screwed around in sync process)
// Stuff like: LocalUpdate + RemoteDelete, ...
logger.WithField("change", change.String()).Warn("Unhandled change case, sync not possible")
}
return nil
}

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sync/state.go Normal file
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package sync
import (
"sort"
"strings"
"sync"
"github.com/Luzifer/cloudbox/providers"
)
const (
sideLocal string = "local"
sideRemote string = "remote"
sourceDB string = "db"
sourceScan string = "scan"
)
type stateDetail struct {
LocalDB,
LocalScan,
RemoteDB,
RemoteScan *providers.FileInfo
}
type state struct {
files map[string]*stateDetail
lock sync.Mutex
}
func newState() *state {
return &state{
files: make(map[string]*stateDetail),
}
}
func (s *state) GetChangeFor(relativeName string) (result Change) {
s.lock.Lock()
defer s.lock.Unlock()
d := s.files[relativeName]
// No changes detected
if d.LocalDB.Equal(d.LocalScan) && d.RemoteDB.Equal(d.RemoteScan) {
// Check special case: Something went really wrong and sync state is FUBAR
if d.LocalDB == nil && d.RemoteDB != nil {
result.Register(ChangeRemoteAdd)
}
if d.LocalDB != nil && d.RemoteDB == nil {
result.Register(ChangeLocalAdd)
}
return result
}
// Check for local changes
switch {
case d.LocalDB == nil && d.LocalScan != nil:
result.Register(ChangeLocalAdd)
case d.LocalDB != nil && d.LocalScan == nil:
result.Register(ChangeLocalDelete)
case !d.LocalDB.Equal(d.LocalScan):
result.Register(ChangeLocalUpdate)
}
// Check for remote changes
switch {
case d.RemoteDB == nil && d.RemoteScan != nil:
result.Register(ChangeRemoteAdd)
case d.RemoteDB != nil && d.RemoteScan == nil:
result.Register(ChangeRemoteDelete)
case !d.RemoteDB.Equal(d.RemoteScan):
result.Register(ChangeRemoteUpdate)
}
return result
}
func (s *state) GetRelativeNames() []string {
s.lock.Lock()
defer s.lock.Unlock()
out := []string{}
for k := range s.files {
out = append(out, k)
}
sort.Strings(out)
return out
}
func (s *state) Set(side, source string, info providers.FileInfo) {
s.lock.Lock()
defer s.lock.Unlock()
if _, ok := s.files[info.RelativeName]; !ok {
s.files[info.RelativeName] = &stateDetail{}
}
switch strings.Join([]string{side, source}, "::") {
case "local::db":
s.files[info.RelativeName].LocalDB = &info
case "local::scan":
s.files[info.RelativeName].LocalScan = &info
case "remote::db":
s.files[info.RelativeName].RemoteDB = &info
case "remote::scan":
s.files[info.RelativeName].RemoteScan = &info
}
}

126
sync/sync.go Normal file
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package sync
import (
"database/sql"
"hash"
"time"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/Luzifer/cloudbox/providers"
)
type Config struct {
ForceUseChecksum bool `yaml:"force_use_checksum"`
ScanInterval time.Duration `yaml:"scan_interval"`
}
type Sync struct {
db *sql.DB
conf Config
local, remote providers.CloudProvider
log *log.Entry
useChecksum bool
hashMethod hash.Hash
stop chan struct{}
}
func New(local, remote providers.CloudProvider, db *sql.DB, conf Config, logger *log.Entry) *Sync {
return &Sync{
db: db,
conf: conf,
local: local,
remote: remote,
log: logger,
stop: make(chan struct{}),
}
}
func (s *Sync) Run() error {
if err := s.initSchema(); err != nil {
return errors.Wrap(err, "Unable to initialize database schema")
}
var refresh = time.NewTimer(s.conf.ScanInterval)
for {
select {
case <-refresh.C:
if err := s.runSync(); err != nil {
return errors.Wrap(err, "Sync failed")
}
refresh.Reset(s.conf.ScanInterval)
case <-s.stop:
return nil
}
}
}
func (s *Sync) Stop() { s.stop <- struct{}{} }
func (s *Sync) getFileInfo(f providers.File) (providers.FileInfo, error) {
var info = f.Info()
if !s.useChecksum || info.Checksum != "" {
return info, nil
}
cs, err := f.Checksum(s.hashMethod)
if err != nil {
return info, errors.Wrap(err, "Unable to fetch checksum")
}
info.Checksum = cs
return info, nil
}
func (s *Sync) fillStateFromProvider(syncState *state, provider providers.CloudProvider, side string) error {
files, err := provider.ListFiles()
if err != nil {
return errors.Wrap(err, "Unable to list files")
}
for _, f := range files {
info, err := s.getFileInfo(f)
if err != nil {
return errors.Wrap(err, "Unable to get file info")
}
syncState.Set(side, sourceScan, info)
}
return nil
}
func (s *Sync) runSync() error {
var syncState = newState()
s.hashMethod = s.remote.GetChecksumMethod()
s.useChecksum = s.remote.Capabilities().Has(providers.CapAutoChecksum) || s.conf.ForceUseChecksum
if err := s.updateStateFromDatabase(syncState); err != nil {
return errors.Wrap(err, "Unable to load database state")
}
if err := s.fillStateFromProvider(syncState, s.local, sideLocal); err != nil {
return errors.Wrap(err, "Unable to load local files")
}
if err := s.fillStateFromProvider(syncState, s.remote, sideRemote); err != nil {
return errors.Wrap(err, "Unable to load remote files")
}
for _, fileName := range syncState.GetRelativeNames() {
if err := s.decideAction(syncState, fileName); err != nil {
return errors.Wrap(err, "Could not execute sync")
}
}
return nil
}