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Add s3 driver for the new Storage Layer API

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This commit is contained in:
Andrey Kostov 2014-10-24 16:37:25 -07:00
parent 47ca8be42f
commit 1342873367
3 changed files with 343 additions and 0 deletions
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57
main/storagedriver/s3/s3.go Normal file
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package main
import (
"encoding/json"
"os"
"strconv"
"github.com/crowdmob/goamz/aws"
"github.com/docker/docker-registry/storagedriver/ipc"
"github.com/docker/docker-registry/storagedriver/s3"
)
func main() {
parametersBytes := []byte(os.Args[1])
var parameters map[string]interface{}
err := json.Unmarshal(parametersBytes, &parameters)
if err != nil {
panic(err)
}
accessKey, ok := parameters["accessKey"].(string)
if !ok || accessKey == "" {
panic("No accessKey parameter")
}
secretKey, ok := parameters["secretKey"].(string)
if !ok || secretKey == "" {
panic("No secretKey parameter")
}
region, ok := parameters["region"].(string)
if !ok || region == "" {
panic("No region parameter")
}
bucket, ok := parameters["bucket"].(string)
if !ok || bucket == "" {
panic("No bucket parameter")
}
encrypt, ok := parameters["encrypt"].(string)
if !ok {
panic("No encrypt parameter")
}
encryptBool, err := strconv.ParseBool(encrypt)
if err != nil {
panic(err)
}
driver, err := s3.NewDriver(accessKey, secretKey, aws.GetRegion(region), encryptBool, bucket)
if err != nil {
panic(err)
}
ipc.Server(driver)
}

257
storagedriver/s3/s3.go Normal file
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package s3
import (
"bytes"
"io"
"net/http"
"strconv"
"github.com/crowdmob/goamz/aws"
"github.com/crowdmob/goamz/s3"
"github.com/docker/docker-registry/storagedriver"
)
/* Chunks need to be at least 5MB to store with a multipart upload on S3 */
const minChunkSize = uint64(5 * 1024 * 1024)
/* The largest amount of parts you can request from S3 */
const listPartsMax = 1000
type S3Driver struct {
S3 *s3.S3
Bucket *s3.Bucket
Encrypt bool
}
func NewDriver(accessKey string, secretKey string, region aws.Region, encrypt bool, bucketName string) (*S3Driver, error) {
auth := aws.Auth{AccessKey: accessKey, SecretKey: secretKey}
s3obj := s3.New(auth, region)
bucket := s3obj.Bucket(bucketName)
if err := bucket.PutBucket(s3.PublicRead); err != nil {
s3Err, ok := err.(*s3.Error)
if !(ok && s3Err.Code == "BucketAlreadyOwnedByYou") {
return nil, err
}
}
return &S3Driver{s3obj, bucket, encrypt}, nil
}
func (d *S3Driver) GetContent(path string) ([]byte, error) {
return d.Bucket.Get(path)
}
func (d *S3Driver) PutContent(path string, contents []byte) error {
return d.Bucket.Put(path, contents, d.getContentType(), d.getPermissions(), d.getOptions())
}
func (d *S3Driver) ReadStream(path string, offset uint64) (io.ReadCloser, error) {
headers := make(http.Header)
headers.Add("Range", "bytes="+strconv.FormatUint(offset, 10)+"-")
resp, err := d.Bucket.GetResponseWithHeaders(path, headers)
if resp != nil {
return resp.Body, err
}
return nil, err
}
func (d *S3Driver) WriteStream(path string, offset, size uint64, reader io.ReadCloser) error {
defer reader.Close()
chunkSize := minChunkSize
for size/chunkSize >= listPartsMax {
chunkSize *= 2
}
partNumber := 1
totalRead := uint64(0)
multi, parts, err := d.getAllParts(path)
if err != nil {
return err
}
if (offset) > uint64(len(parts))*chunkSize || (offset < size && offset%chunkSize != 0) {
return storagedriver.InvalidOffsetError{path, offset}
}
if len(parts) > 0 {
partNumber = int(offset/chunkSize) + 1
totalRead = offset
parts = parts[0 : partNumber-1]
}
buf := make([]byte, chunkSize)
for {
bytesRead, err := io.ReadFull(reader, buf)
totalRead += uint64(bytesRead)
if err != nil && err != io.ErrUnexpectedEOF && err != io.EOF {
return err
} else if (uint64(bytesRead) < chunkSize) && totalRead != size {
break
} else {
part, err := multi.PutPart(int(partNumber), bytes.NewReader(buf[0:bytesRead]))
if err != nil {
return err
}
parts = append(parts, part)
if totalRead == size {
multi.Complete(parts)
break
}
partNumber++
}
}
return nil
}
func (d *S3Driver) ResumeWritePosition(path string) (uint64, error) {
_, parts, err := d.getAllParts(path)
if err != nil {
return 0, err
}
if len(parts) == 0 {
return 0, nil
}
return (((uint64(len(parts)) - 1) * uint64(parts[0].Size)) + uint64(parts[len(parts)-1].Size)), nil
}
func (d *S3Driver) List(prefix string) ([]string, error) {
listResponse, err := d.Bucket.List(prefix+"/", "/", "", listPartsMax)
if err != nil {
return nil, err
}
files := []string{}
directories := []string{}
for len(listResponse.Contents) > 0 || len(listResponse.CommonPrefixes) > 0 {
for _, key := range listResponse.Contents {
files = append(files, key.Key)
}
for _, commonPrefix := range listResponse.CommonPrefixes {
directories = append(directories, commonPrefix[0:len(commonPrefix)-1])
}
lastFile := ""
lastDirectory := ""
lastMarker := ""
if len(files) > 0 {
lastFile = files[len(files)-1]
}
if len(directories) > 0 {
lastDirectory = directories[len(directories)-1] + "/"
}
if lastDirectory > lastFile {
lastMarker = lastDirectory
} else {
lastMarker = lastFile
}
listResponse, err = d.Bucket.List(prefix+"/", "/", lastMarker, listPartsMax)
if err != nil {
return nil, err
}
}
return append(files, directories...), nil
}
func (d *S3Driver) Move(sourcePath string, destPath string) error {
/* This is terrible, but aws doesn't have an actual move. */
_, err := d.Bucket.PutCopy(destPath, d.getPermissions(), s3.CopyOptions{d.getOptions(), "", d.getContentType()}, d.Bucket.Name+"/"+sourcePath)
if err != nil {
return err
}
return d.Delete(sourcePath)
}
func (d *S3Driver) Delete(path string) error {
listResponse, err := d.Bucket.List(path, "", "", listPartsMax)
if err != nil || len(listResponse.Contents) == 0 {
return storagedriver.PathNotFoundError{path}
}
s3Objects := make([]s3.Object, listPartsMax)
for len(listResponse.Contents) > 0 {
for index, key := range listResponse.Contents {
s3Objects[index].Key = key.Key
}
err := d.Bucket.DelMulti(s3.Delete{false, s3Objects[0:len(listResponse.Contents)]})
if err != nil {
return nil
}
listResponse, err = d.Bucket.List(path, "", "", listPartsMax)
if err != nil {
return err
}
}
return nil
}
func (d *S3Driver) getHighestIdMulti(path string) (multi *s3.Multi, err error) {
multis, _, err := d.Bucket.ListMulti(path, "")
if err != nil && !hasCode(err, "NoSuchUpload") {
return nil, err
}
uploadId := ""
if len(multis) > 0 {
for _, m := range multis {
if m.Key == path && m.UploadId >= uploadId {
uploadId = m.UploadId
multi = m
}
}
return multi, nil
} else {
multi, err := d.Bucket.InitMulti(path, d.getContentType(), d.getPermissions(), d.getOptions())
return multi, err
}
}
func (d *S3Driver) getAllParts(path string) (*s3.Multi, []s3.Part, error) {
multi, err := d.getHighestIdMulti(path)
if err != nil {
return nil, nil, err
}
parts, err := multi.ListParts()
return multi, parts, err
}
func hasCode(err error, code string) bool {
s3err, ok := err.(*aws.Error)
return ok && s3err.Code == code
}
func (d *S3Driver) getOptions() s3.Options {
return s3.Options{SSE: d.Encrypt}
}
func (d *S3Driver) getPermissions() s3.ACL {
return s3.Private
}
func (d *S3Driver) getContentType() string {
return "application/octet-stream"
}

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storagedriver/s3/s3_test.go Normal file
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package s3
import (
"os"
"testing"
"github.com/crowdmob/goamz/aws"
"github.com/docker/docker-registry/storagedriver"
"github.com/docker/docker-registry/storagedriver/testsuites"
. "gopkg.in/check.v1"
)
// Hook up gocheck into the "go test" runner.
func Test(t *testing.T) { TestingT(t) }
func init() {
accessKey := os.Getenv("ACCESS_KEY")
secretKey := os.Getenv("SECRET_KEY")
region := os.Getenv("AWS_REGION")
bucket := os.Getenv("S3_BUCKET")
encrypt := os.Getenv("S3_ENCRYPT")
s3DriverConstructor := func() (storagedriver.StorageDriver, error) {
return NewDriver(accessKey, secretKey, aws.GetRegion(region), true, bucket)
}
testsuites.RegisterInProcessSuite(s3DriverConstructor)
testsuites.RegisterIPCSuite("s3", map[string]string{"accessKey": accessKey, "secretKey": secretKey, "region": region, "bucket": bucket, "encrypt": encrypt})
}