mirror of
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Initial version
This commit is contained in:
commit
9821a219a3
GPG key ID:
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9 changed files with 515 additions and 0 deletions
1
.gitignore
vendored
Normal file
1
.gitignore
vendored
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|
|
@ -0,0 +1 @@
|
|||
data/
|
||||
30
Dockerfile
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30
Dockerfile
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|
|
@ -0,0 +1,30 @@
|
|||
FROM golang:alpine as builder
|
||||
|
||||
COPY . /go/src/github.com/Luzifer/preserve
|
||||
WORKDIR /go/src/github.com/Luzifer/preserve
|
||||
|
||||
RUN set -ex \
|
||||
&& apk add --update git \
|
||||
&& go install \
|
||||
-ldflags "-X main.version=$(git describe --tags --always || echo dev)" \
|
||||
-mod=readonly
|
||||
|
||||
FROM alpine:latest
|
||||
|
||||
LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
|
||||
|
||||
ENV STORAGE_DIR=/data
|
||||
|
||||
RUN set -ex \
|
||||
&& apk --no-cache add \
|
||||
ca-certificates
|
||||
|
||||
COPY --from=builder /go/bin/preserve /usr/local/bin/preserve
|
||||
|
||||
EXPOSE 3000
|
||||
VOLUME ["/data"]
|
||||
|
||||
ENTRYPOINT ["/usr/local/bin/preserve"]
|
||||
CMD ["--"]
|
||||
|
||||
# vim: set ft=Dockerfile:
|
||||
202
LICENSE
Normal file
202
LICENSE
Normal file
|
|
@ -0,0 +1,202 @@
|
|||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
||||
1. Definitions.
|
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|
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"You" (or "Your") shall mean an individual or Legal Entity
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Notwithstanding the above, nothing herein shall supersede or modify
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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Copyright 2020- Knut Ahlers <knut@ahlers.me>
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|
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Licensed under the Apache License, Version 2.0 (the "License");
|
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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|
||||
25
README.md
Normal file
25
README.md
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
[](https://goreportcard.com/report/github.com/Luzifer/preserve)
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
# Luzifer / preserve
|
||||
|
||||
`preserve` is a little HTTP server to preserve the presence of URLs.
|
||||
|
||||
Ever relied on an HTTP resource to be available and it vanished? Happened too often to me so I wrote a little tool to prevent URLs from vanishing: `preserve`.
|
||||
|
||||
## Usage
|
||||
|
||||
After you've started `preserve` it will by default listen on port 3000 and you can start using it by prefixing the URL of the resource:
|
||||
|
||||
Lets say you want to ensure the image `https://example.com/image.png` does not vanish:
|
||||
|
||||
- `http://localhost:3000/https://example.com/image.png` will fetch the resource once and then deliver it from the local cache
|
||||
- `http://localhost:3000/latest/https://example.com/image.png` will fetch the resource with every request until it gets unavailable and then serve it from local cache
|
||||
|
||||
This also works with parameters:
|
||||
|
||||
`http://localhost:3000/https://pbs.twimg.com/media/somemediaid?format=jpg&name=4096x4096`
|
||||
|
||||
51
cache.go
Normal file
51
cache.go
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"io"
|
||||
"net/http"
|
||||
"os"
|
||||
"path"
|
||||
"time"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
)
|
||||
|
||||
func renewCache(url string) (*meta, error) {
|
||||
var cachePath = urlToCachePath(url)
|
||||
|
||||
resp, err := http.Get(url)
|
||||
if err != nil {
|
||||
return nil, errors.Wrap(err, "Unable to fetch source file")
|
||||
}
|
||||
|
||||
if resp.StatusCode > 299 {
|
||||
return nil, errors.Errorf("HTTP status signaled failure: %d", resp.StatusCode)
|
||||
}
|
||||
|
||||
if err = os.MkdirAll(path.Dir(cachePath), 0700); err != nil {
|
||||
return nil, errors.Wrap(err, "Unable to create cache dir")
|
||||
}
|
||||
|
||||
f, err := os.Create(cachePath)
|
||||
if err != nil {
|
||||
return nil, errors.Wrap(err, "Unable to create cache file")
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
if _, err := io.Copy(f, resp.Body); err != nil {
|
||||
return nil, errors.Wrap(err, "Unable to write cache file")
|
||||
}
|
||||
|
||||
var lm = time.Now()
|
||||
if t, err := time.Parse(http.TimeFormat, resp.Header.Get("Last-Modified")); err == nil {
|
||||
lm = t
|
||||
}
|
||||
|
||||
metadata := &meta{
|
||||
ContentType: resp.Header.Get("Content-Type"),
|
||||
LastCached: time.Now(),
|
||||
LastModified: lm,
|
||||
}
|
||||
|
||||
return metadata, saveMeta(cachePath, *metadata)
|
||||
}
|
||||
11
go.mod
Normal file
11
go.mod
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
module github.com/Luzifer/preserve
|
||||
|
||||
go 1.14
|
||||
|
||||
require (
|
||||
github.com/Luzifer/rconfig/v2 v2.2.1
|
||||
github.com/gologme/log v1.2.0
|
||||
github.com/gorilla/mux v1.7.4
|
||||
github.com/pkg/errors v0.9.1
|
||||
github.com/sirupsen/logrus v1.6.0
|
||||
)
|
||||
25
go.sum
Normal file
25
go.sum
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
github.com/Luzifer/rconfig v1.2.0 h1:waD1sqasGVSQSrExpLrQ9Q1JmMaltrS391VdOjWXP/I=
|
||||
github.com/Luzifer/rconfig/v2 v2.2.1 h1:zcDdLQlnlzwcBJ8E0WFzOkQE1pCMn3EbX0dFYkeTczg=
|
||||
github.com/Luzifer/rconfig/v2 v2.2.1/go.mod h1:OKIX0/JRZrPJ/ZXXWklQEFXA6tBfWaljZbW37w+sqBw=
|
||||
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/gologme/log v1.2.0 h1:Ya5Ip/KD6FX7uH0S31QO87nCCSucKtF44TLbTtO7V4c=
|
||||
github.com/gologme/log v1.2.0/go.mod h1:gq31gQ8wEHkR+WekdWsqDuf8pXTUZA9BnnzTuPz1Y9U=
|
||||
github.com/gorilla/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=
|
||||
github.com/gorilla/mux v1.7.4/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
|
||||
github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
|
||||
github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
|
||||
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
|
||||
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
|
||||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
||||
github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
|
||||
github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
|
||||
github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
|
||||
github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
|
||||
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=
|
||||
122
main.go
Normal file
122
main.go
Normal file
|
|
@ -0,0 +1,122 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"crypto/sha256"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"os"
|
||||
"path"
|
||||
"strings"
|
||||
|
||||
"github.com/gorilla/mux"
|
||||
log "github.com/sirupsen/logrus"
|
||||
|
||||
"github.com/Luzifer/rconfig/v2"
|
||||
)
|
||||
|
||||
var (
|
||||
cfg = struct {
|
||||
Listen string `flag:"listen" default:":3000" description:"Port/IP to listen on"`
|
||||
LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
|
||||
StorageDir string `flag:"storage-dir" default:"./data/" description:"Where to store cached files"`
|
||||
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
|
||||
}{}
|
||||
|
||||
version = "dev"
|
||||
)
|
||||
|
||||
func init() {
|
||||
rconfig.AutoEnv(true)
|
||||
if err := rconfig.ParseAndValidate(&cfg); err != nil {
|
||||
log.Fatalf("Unable to parse commandline options: %s", err)
|
||||
}
|
||||
|
||||
if cfg.VersionAndExit {
|
||||
fmt.Printf("preserve %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)
|
||||
}
|
||||
}
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
r.PathPrefix("/latest/").HandlerFunc(handleCacheLatest)
|
||||
r.PathPrefix("/").HandlerFunc(handleCacheOnce)
|
||||
|
||||
r.SkipClean(true)
|
||||
|
||||
http.ListenAndServe(cfg.Listen, r)
|
||||
}
|
||||
|
||||
func handleCacheLatest(w http.ResponseWriter, r *http.Request) {
|
||||
handleCache(w, r, strings.TrimPrefix(r.RequestURI, "/latest/"), true)
|
||||
}
|
||||
|
||||
func handleCacheOnce(w http.ResponseWriter, r *http.Request) {
|
||||
handleCache(w, r, strings.TrimPrefix(r.RequestURI, "/"), false)
|
||||
}
|
||||
|
||||
func handleCache(w http.ResponseWriter, r *http.Request, uri string, update bool) {
|
||||
var (
|
||||
cachePath = urlToCachePath(uri)
|
||||
cacheHeader = "HIT"
|
||||
logger = log.WithFields(log.Fields{
|
||||
"url": uri,
|
||||
"path": cachePath,
|
||||
})
|
||||
)
|
||||
|
||||
if u, err := url.Parse(uri); err != nil || u.Scheme == "" {
|
||||
http.Error(w, "Unable to parse requested URL", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
logger.Debug("Received request")
|
||||
|
||||
metadata, err := loadMeta(cachePath)
|
||||
if err != nil && !os.IsNotExist(err) {
|
||||
log.WithError(err).Error("Unable to load meta")
|
||||
http.Error(w, "Unable to access entry metadata", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
if update || os.IsNotExist(err) {
|
||||
logger.Debug("Updating cache")
|
||||
cacheHeader = "MISS"
|
||||
|
||||
metadata, err = renewCache(uri)
|
||||
if err != nil {
|
||||
log.WithError(err).Warn("Unable to refresh file")
|
||||
}
|
||||
}
|
||||
|
||||
if metadata == nil {
|
||||
http.NotFound(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Type", metadata.ContentType)
|
||||
w.Header().Set("X-Last-Cached", metadata.LastCached.UTC().Format(http.TimeFormat))
|
||||
w.Header().Set("X-Cache", cacheHeader)
|
||||
|
||||
f, err := os.Open(cachePath)
|
||||
if err != nil {
|
||||
log.WithError(err).Error("Unable to load cached file")
|
||||
http.Error(w, "Unable to access cache entry", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
http.ServeContent(w, r, "", metadata.LastModified, f)
|
||||
}
|
||||
|
||||
func urlToCachePath(url string) string {
|
||||
h := fmt.Sprintf("%x", sha256.Sum256([]byte(url)))
|
||||
return path.Join(cfg.StorageDir, h[0:2], h)
|
||||
}
|
||||
48
meta.go
Normal file
48
meta.go
Normal file
|
|
@ -0,0 +1,48 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"os"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
)
|
||||
|
||||
type meta struct {
|
||||
ContentType string
|
||||
LastCached time.Time
|
||||
LastModified time.Time
|
||||
}
|
||||
|
||||
func loadMeta(p string) (*meta, error) {
|
||||
var metaPath = strings.Join([]string{p, "meta"}, ".")
|
||||
if _, err := os.Stat(metaPath); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
f, err := os.Open(metaPath)
|
||||
if err != nil {
|
||||
return nil, errors.Wrap(err, "Unable to open metadata file")
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
var out = new(meta)
|
||||
return out, errors.Wrap(
|
||||
json.NewDecoder(f).Decode(out),
|
||||
"Unable to decode metadata file",
|
||||
)
|
||||
}
|
||||
|
||||
func saveMeta(p string, m meta) error {
|
||||
f, err := os.Create(strings.Join([]string{p, "meta"}, "."))
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "Unable to create cache meta file")
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
return errors.Wrap(
|
||||
json.NewEncoder(f).Encode(m),
|
||||
"Unable to write cache meta file",
|
||||
)
|
||||
}
|
||||
Loading…
Reference in a new issue