Please refer to CHANGELOG.md if you encounter breaking changes.
- Motivation
- Introduction
- Usage
- Matchers
- Content modifiers
- Streaming data
- Options
- Storage Implementations
- Testing mode
- Storage Manager
- GoCover
- License
- Credits and Acknowledgements
When dealing with various storage systems, like cloud storage, SCP, container or local file system, using shared API for typical storage operation provides an excellent simplification. What's more, the ability to simulate storage-related errors like Auth or EOF allows you to test an app error handling.
This library uses a storage manager abstraction to provide an implementation for a specific storage system with following
- CRUD Operation:
List(ctx context.Context, URL string, options ...Option) ([]Object, error)
Walk(ctx context.Context, URL string, handler OnVisit, options ...Option) error
Open(ctx context.Context, object Object, options ...Option) (io.ReadCloser, error)
OpenURL(ctx context.Context, URL string, options ...Option) (io.ReadCloser, error)
Upload(ctx context.Context, URL string, mode os.FileMode, reader io.Reader, options ...Option) error
Create(ctx context.Context, URL string, mode os.FileMode, isDir bool, options ...Option) error
Delete(ctx context.Context, URL string, options ...Option) error- Batch uploader:
type Upload func(ctx context.Context, parent string, info os.FileInfo, reader io.Reader) error
Uploader(ctx context.Context, URL string, options ...Option) (Upload, io.Closer, error)- Utilities:
Copy(ctx context.Context, sourceURL, destURL string, options ...Option) error
Move(ctx context.Context, sourceURL, destURL string, options ...Option) error
NewWriter(ctx context.Context, URL string, mode os.FileMode, options ...storage.Option) (io.WriteCloser, error)
DownloadWithURL(ctx context.Context, URL string, options ...Option) ([]byte, error)
Download(ctx context.Context, object Object, options ...Option) ([]byte, error)URL scheme is used to identify storage system, or alternatively relative/absolute path can be used for local file storage. By default, all operations using the same baseURL share the same corresponding storage manager instance. For example, instead supplying SCP auth details for all operations, auth option can be used only once.
func main() {
ctx := context.Background()
{
//auth with first call
fs := afs.New()
defer fs.Close()
keyAuth, err := scp.LocalhostKeyAuth("")
if err != nil {
log.Fatal(err)
}
reader1, err := fs.OpenURL(ctx, "scp://host1:22/myfolder/asset.txt", keyAuth)
if err != nil {
log.Fatal(err)
}
...
reader2, err := fs.OpenURL(ctx, "scp://host1:22/myfolder/asset.txt", keyAuth)
}
{
//auth per baseURL
fs := afs.New()
err = fs.Init(ctx, "scp://host1:22/", keyAuth)
if err != nil {
log.Fatal(err)
}
defer fs.Destroy("scp://host1:22/")
reader, err := fs.OpenURL(ctx, "scp://host1:22/myfolder/asset.txt")
}
}func main() {
fs := afs.New()
ctx := context.Background()
objects, err := fs.List(ctx, "/tmp/folder")
if err != nil {
log.Fatal(err)
}
for _, object := range objects {
fmt.Printf("%v %v\n", object.Name(), object.URL())
if object.IsDir() {
continue
}
reader, err := fs.Open(ctx, object)
if err != nil {
log.Fatal(err)
}
data, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s\n", data)
}
}func main() {
fs := afs.New()
ctx := context.Background()
keyAuth, err := scp.LocalhostKeyAuth("")
if err != nil {
log.Fatal(err)
}
err = fs.Init(ctx, "scp://127.0.0.1:22/", keyAuth)
if err != nil {
log.Fatal(err)
}
err = fs.Upload(ctx, "scp://127.0.0.1:22/folder/asset.txt", 0644, strings.NewReader("test me"))
if err != nil {
log.Fatal(err)
}
ok, err := fs.Exists(ctx, "scp://127.0.0.1:22/folder/asset.txt")
if err != nil {
log.Fatal(err)
}
fmt.Printf("has file: %v\n", ok)
_ = fs.Delete(ctx, "scp://127.0.0.1:22/folder/asset.txt")
}func main() {
fs := afs.New()
ctx := context.Background()
keyAuth, err := scp.LocalhostKeyAuth("")
if err != nil {
log.Fatal(err)
}
err = fs.Init(ctx, "scp://127.0.0.1:22/", keyAuth)
if err != nil {
log.Fatal(err)
}
writer = fs.NewWriter(ctx, "scp://127.0.0.1:22/folder/asset.txt", 0644)
_, err := writer.Write([]byte("test me")))
if err != nil {
log.Fatal(err)
}
err = writer.Close()
if err != nil {
log.Fatal(err)
}
ok, err := fs.Exists(ctx, "scp://127.0.0.1:22/folder/asset.txt")
if err != nil {
log.Fatal(err)
}
fmt.Printf("has file: %v\n", ok)
_ = fs.Delete(ctx, "scp://127.0.0.1:22/folder/asset.txt")
}func main() {
fs := afs.New()
ctx := context.Background()
keyAuth, err := scp.LocalhostKeyAuth("")
if err != nil {
log.Fatal(err)
}
err = fs.Copy(ctx, "s3://mybucket/myfolder", "scp://127.0.0.1/tmp", option.NewSource(), option.NewDest(keyAuth))
if err != nil {
log.Fatal(err)
}
}func main() {
secretPath := path.Join(os.Getenv("HOME"), ".secret", "gcp-e2e.json")
auth, err := gs.NewJwtConfig(option.NewLocation(secretPath))
if err != nil {
return
}
sourceURL := "mylocalPath/"
destURL := "gs:mybucket/test.zip/zip://localhost/dir1"
fs := afs.New()
ctx := context.Background()
err = fs.Copy(ctx, sourceURL, destURL, option.NewDest(auth))
if err != nil {
log.Fatal(err)
}
} Walker can be created for tar or zip archive.
func main() {
ctx := context.Background()
fs := afs.New()
walker := tar.NewWalker(s3afs.New())
err := fs.Copy(ctx, "/tmp/test.tar", "s3:///dest/folder/test", walker)
if err != nil {
log.Fatal(err)
}Uploader can be created for tar or zip archive.
func main() {
ctx := context.Background()
fs := afs.New()
uploader := zip.NewBatchUploader(gsafs.New())
err := fs.Copy(ctx, "gs:///tmp/test/data", "/tmp/data.zip", uploader)
if err != nil {
log.Fatal(err)
}
}func main() {
fs := afs.New()
ctx := context.Background()
keyAuth, err := scp.LocalhostKeyAuth("")
if err != nil {
log.Fatal(err)
}
err = fs.Move(ctx, "/tmp/transient/app", "scp://127.0.0.1/tmp", option.NewSource(), option.NewDest(keyAuth))
if err != nil {
log.Fatal(err)
}
} func main() {
fs := afs.New()
ctx := context.Background()
upload, closer, err := fs.Uploader(ctx, "/tmp/clone")
if err != nil {
log.Fatal(err)
}
defer closer.Close()
assets := []*asset.Resource{
asset.NewFile("asset1.txt", []byte("test 1"), 0644),
asset.NewFile("asset2.txt", []byte("test 2"), 0644),
asset.NewDir("folder1", file.DefaultDirOsMode),
asset.NewFile("folder1/asset1.txt", []byte("test 3"), 0644),
asset.NewFile("folder1/asset2.txt", []byte("test 4"), 0644),
}
for _, asset := range assets {
relative := ""
var reader io.Reader
if strings.Contains(asset.Name, "/") {
relative, _ = path.Split(asset.Name)
}
if ! asset.Dir {
reader = bytes.NewReader(asset.Data)
}
err = upload(ctx, relative, asset.Info(), reader)
if err != nil {
log.Fatal(err)
}
}
}To filter source content you can use Matcher option. The following have been implemented.
func main() {
matcher, err := NewBasic("/data", ".avro", nil)
fs := afs.New()
ctx := context.Background()
err := fs.Copy(ctx, "/tmp/data", "s3://mybucket/data/", matcher.Match)
if err != nil {
log.Fatal(err)
}
}Exclusion
func main() {
matcher := matcher.Basic{Exclusion:".+/data/perf/\\d+/.+"}
fs := afs.New()
ctx := context.Background()
err := fs.Copy(ctx, "/tmp/data", "s3://mybucket/data/", matcher.Match)
if err != nil {
log.Fatal(err)
}
}OS style filepath match, with the following terms:
- '*' matches any sequence of non-Separator characters
- '?' matches any single non-Separator character
- '[' [ '^' ] { character-range } ']'
func main() {
matcher := matcher.Filepath("*.avro")
fs := afs.New()
ctx := context.Background()
err := fs.Copy(ctx, "/tmp/data", "gs://mybucket/data/", matcher)
if err != nil {
log.Fatal(err)
}
}
Ignore matcher represents matcher that matches file that are not in the ignore rules. The syntax of ignore borrows heavily from that of .gitignore; see https://git-scm.com/docs/gitignore or man gitignore for a full reference.
func mian(){
ignoreMatcher, err := matcher.NewIgnore([]string{"*.txt", ".ignore"})
//or matcher.NewIgnore(option.NewLocation(".cloudignore"))
if err != nil {
log.Fatal(err)
}
fs := afs.New()
ctx := context.Background()
objects, err := fs.List(ctx, "/tmp/folder", ignoreMatcher.Match)
if err != nil {
log.Fatal(err)
}
for _, object := range objects {
fmt.Printf("%v %v\n", object.Name(), object.URL())
if object.IsDir() {
continue
}
}
} Modification Time Matcher represents matcher that matches file that were modified either before or after specified time.
func mian(){
before, err := toolbox.TimeAt("2 days ago in UTC")
if err != nil {
log.Fatal(err)
}
modTimeMatcher, err := matcher.NewModification(before, nil)
if err != nil {
log.Fatal(err)
}
fs := afs.New()
ctx := context.Background()
objects, err := fs.List(ctx, "/tmp/folder", modTimeMatcher.Match)
if err != nil {
log.Fatal(err)
}
for _, object := range objects {
fmt.Printf("%v %v\n", object.Name(), object.URL())
if object.IsDir() {
continue
}
}
} To modify resource content on the fly you can use Modifier option.
func main() {
fs := afs.New()
ctx := context.Background()
sourceURL := "file:/tmp/app.war/zip://localhost/WEB-INF/classes/config.properties"
destURL := "file:/tmp/app.war/zip://localhost/"
err := fs.Copy(ctx, sourceURL, destURL, modifier.Replace(map[string]string{
"${changeMe}": os.Getenv("USER"),
}))
if err != nil {
log.Fatal(err)
}
}package main
import (
"context"
"log"
"github.com/viant/afs"
"io"
"fmt"
"io/ioutil"
"os"
"strings"
)
func modifyContent(info os.FileInfo, reader io.ReadCloser) (closer io.ReadCloser, e error) {
if strings.HasSuffix(info.Name() ,".info") {
data, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
_ = reader.Close()
expanded := strings.Replace(string(data), "$os.User", os.Getenv("USER"), 1)
reader = ioutil.NopCloser(strings.NewReader(expanded))
}
return reader, nil
}
func main() {
fs := afs.New()
reader ,err := fs.OpenURL(context.Background(), "s3://mybucket/meta.info", modifyContent)
if err != nil {
log.Fatal(err)
}
defer reader.Close()
content, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Printf("content: %s\n", content)
}Streaming data allows data reading and uploading in chunks with small memory footprint.
jwtConfig, err := gs.NewJwtConfig()
if err != nil {
log.Fatal(err)
}
ctx := context.Background()
fs := afs.New()
sourceURL := "gs://myBucket/path/myasset.gz"
reader, err := fs.OpenURL(ctx, sourceURL, jwtConfig, option.NewStream(64*1024*1024, 0))
if err != nil {
log.Fatal(err)
}
_ = os.Setenv("AWS_SDK_LOAD_CONFIG", "true")
destURL := "s3://myBucket/path/myasset.gz"
err = fs.Upload(ctx, destURL, 0644, reader, &option.Checksum{Skip:true})
if err != nil {
log.Fatal(err)
}
// or
writer = fs.NewWriter(ctx, destURL, 0644, &option.Checksum{Skip:true})
_, err = io.Copy(writer, reader)
if err != nil {
log.Fatal(err)
}
err = writer.Close()
if err != nil {
log.Fatal(err)
}To control number and position of listed resources you can yse page option.
Provider specific timeout.
Provides user/password auth.
- Source & Dest Options
Groups options by source or destination options. This options work with Copy or Move operations.
func main() {
fs := afs.New()
secretPath := path.Join(os.Getenv("HOME"), ".secret","gcp.json")
jwtConfig, err := gs.NewJwtConfig(option.NewLocation(secretPath))
if err != nil {
log.Fatal(err)
}
sourceOptions := option.NewSource(jwtConfig)
authConfig, err := s3.NewAuthConfig(option.NewLocation("aws.json"))
if err != nil {
log.Fatal(err)
}
destOptions := option.NewDest(authConfig)
err = fs.Copy(ctx, "gs://mybucket/data", "s3://mybucket/data", sourceOptions, destOptions)
}- option.Checksum skip computing checksum if Skip is set, this option allows streaming upload in chunks
- option.Stream: download reader reads data with specified stream PartSize
Check out storage manager for additional options.
To unit test all storage operation all in memory you can use faker fs.
In addition you can use error options to test exception handling.
- DownloadError
func mian() {
fs := afs.NewFaker()
ctx := context.Background()
err := fs.Upload(ctx, "gs://myBucket/folder/asset.txt", 0, strings.NewReader("some data"), option.NewUploadError(io.EOF))
if err != nil {
log.Fatalf("expect upload error: %v", err)
}
}- ReaderError
func mian() {
fs := afs.NewFaker()
ctx := context.Background()
err := fs.Upload(ctx, "gs://myBucket/folder/asset.txt", 0, strings.NewReader("some data"), option.NewDownloadError(io.EOF))
if err != nil {
log.Fatal(err)
}
_, err = fs.OpenURL(ctx, "gs://myBucket/folder/asset.txt")
if err != nil {
log.Fatalf("expect download error: %v", err)
}
}- UploadError
func mian() {
fs := afs.NewFaker()
ctx := context.Background()
err := fs.Upload(ctx, "gs://myBucket/folder/asset.txt", 0, strings.NewReader("some data"), option.NewUploadError(io.EOF))
if err != nil {
log.Fatalf("expect upload error: %v", err)
}
}Generate with mem storage
package main
import (
"log"
"github.com/viant/afs/parrot
)
func mian() {
ctx := context.Background()
err := parrot.GenerateWithMem(ctx, "pathToBinaryAsset", "gen.go", false)
if err != nil {
log.Fatal(err)
}
}
Generate static data files
package main
import (
"log"
"github.com/viant/afs/parrot
)
func mian() {
ctx := context.Background()
err := parrot.Generate(ctx, "pathToBinaryAsset", "data/", false)
if err != nil {
log.Fatal(err)
}
}
Package asset defines basic utilities to quickly manage asset related unit tests.
func Test_XXX(t *testing.T) {
var useCases = []struct {
description string
location string
options []storage.Option
assets []*asset.Resource
}{
}
ctx := context.Background()
for _, useCase := range useCases {
fs := afs.New()
mgr, err := afs.Manager(useCase.location, useCase.options...)
if err != nil {
log.Fatal(err)
}
err = asset.Create(mgr, useCase.location, useCase.assets)
if err != nil {
log.Fatal(err)
}
//... actual app logic
actuals, err := asset.Load(mgr, useCase.location)
if err != nil {
log.Fatal(err)
}
for _, expect := range useCase.assets {
actual, ok := actuals[expect.Name]
if !assert.True(t, ok, useCase.description+": "+expect.Name+fmt.Sprintf(" - actuals: %v", actuals)) {
continue
}
assert.EqualValues(t, expect.Name, actual.Name, useCase.description+" "+expect.Name)
assert.EqualValues(t, expect.Mode, actual.Mode, useCase.description+" "+expect.Name)
assert.EqualValues(t, expect.Dir, actual.Dir, useCase.description+" "+expect.Name)
assert.EqualValues(t, expect.Data, actual.Data, useCase.description+" "+expect.Name)
}
_ = asset.Cleanup(mgr, useCase.location)
}
}The source code is made available under the terms of the Apache License, Version 2, as stated in the file LICENSE.
Individual files may be made available under their own specific license, all compatible with Apache License, Version 2. Please see individual files for details.
Library Author: Adrian Witas
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