distribution/storagedriver/s3/s3.go

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package s3
import (
"bytes"
"fmt"
"io"
"net/http"
"strconv"
"github.com/crowdmob/goamz/aws"
"github.com/crowdmob/goamz/s3"
"github.com/docker/docker-registry/storagedriver"
"github.com/docker/docker-registry/storagedriver/factory"
)
const driverName = "s3"
// minChunkSize defines the minimum multipart upload chunk size
// S3 API requires multipart upload chunks to be at least 5MB
const minChunkSize = 5 * 1024 * 1024
// listPartsMax is the largest amount of parts you can request from S3
const listPartsMax = 1000
func init() {
factory.Register(driverName, &s3DriverFactory{})
}
// s3DriverFactory implements the factory.StorageDriverFactory interface
type s3DriverFactory struct{}
func (factory *s3DriverFactory) Create(parameters map[string]string) (storagedriver.StorageDriver, error) {
return FromParameters(parameters)
}
// Driver is a storagedriver.StorageDriver implementation backed by Amazon S3
// Objects are stored at absolute keys in the provided bucket
type Driver struct {
S3 *s3.S3
Bucket *s3.Bucket
Encrypt bool
}
// FromParameters constructs a new Driver with a given parameters map
// Required parameters:
// - accesskey
// - secretkey
// - region
// - bucket
// - encrypt
func FromParameters(parameters map[string]string) (*Driver, error) {
accessKey, ok := parameters["accesskey"]
if !ok || accessKey == "" {
return nil, fmt.Errorf("No accesskey parameter provided")
}
secretKey, ok := parameters["secretkey"]
if !ok || secretKey == "" {
return nil, fmt.Errorf("No secretkey parameter provided")
}
regionName, ok := parameters["region"]
if !ok || regionName == "" {
return nil, fmt.Errorf("No region parameter provided")
}
region := aws.GetRegion(regionName)
if region.Name == "" {
return nil, fmt.Errorf("Invalid region provided: %v", region)
}
bucket, ok := parameters["bucket"]
if !ok || bucket == "" {
return nil, fmt.Errorf("No bucket parameter provided")
}
encrypt, ok := parameters["encrypt"]
if !ok {
return nil, fmt.Errorf("No encrypt parameter provided")
}
encryptBool, err := strconv.ParseBool(encrypt)
if err != nil {
return nil, fmt.Errorf("Unable to parse the encrypt parameter: %v", err)
}
return New(accessKey, secretKey, region, encryptBool, bucket)
}
// New constructs a new Driver with the given AWS credentials, region, encryption flag, and
// bucketName
func New(accessKey string, secretKey string, region aws.Region, encrypt bool, bucketName string) (*Driver, error) {
auth := aws.Auth{AccessKey: accessKey, SecretKey: secretKey}
s3obj := s3.New(auth, region)
bucket := s3obj.Bucket(bucketName)
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if err := bucket.PutBucket(getPermissions()); err != nil {
s3Err, ok := err.(*s3.Error)
if !(ok && s3Err.Code == "BucketAlreadyOwnedByYou") {
return nil, err
}
}
return &Driver{s3obj, bucket, encrypt}, nil
}
// Implement the storagedriver.StorageDriver interface
// GetContent retrieves the content stored at "path" as a []byte.
func (d *Driver) GetContent(path string) ([]byte, error) {
content, err := d.Bucket.Get(path)
if err != nil {
return nil, storagedriver.PathNotFoundError{Path: path}
}
return content, nil
}
// PutContent stores the []byte content at a location designated by "path".
func (d *Driver) PutContent(path string, contents []byte) error {
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return d.Bucket.Put(path, contents, d.getContentType(), getPermissions(), d.getOptions())
}
// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
// given byte offset.
func (d *Driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
headers := make(http.Header)
headers.Add("Range", "bytes="+strconv.FormatInt(offset, 10)+"-")
resp, err := d.Bucket.GetResponseWithHeaders(path, headers)
if err != nil {
return nil, storagedriver.PathNotFoundError{Path: path}
}
return resp.Body, nil
}
// WriteStream stores the contents of the provided io.ReadCloser at a location
// designated by the given path.
func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadCloser) error {
defer reader.Close()
chunkSize := int64(minChunkSize)
for size/chunkSize >= listPartsMax {
chunkSize *= 2
}
partNumber := 1
var totalRead int64
multi, parts, err := d.getAllParts(path)
if err != nil {
return err
}
if (offset) > int64(len(parts))*chunkSize || (offset < size && offset%chunkSize != 0) {
return storagedriver.InvalidOffsetError{Path: path, Offset: 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 += int64(bytesRead)
if err != nil && err != io.ErrUnexpectedEOF && err != io.EOF {
return err
} else if (int64(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
}
// CurrentSize retrieves the curernt size in bytes of the object at the given
// path.
func (d *Driver) CurrentSize(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
}
// List returns a list of the objects that are direct descendants of the given
// path.
func (d *Driver) List(path string) ([]string, error) {
if path[len(path)-1] != '/' {
path = path + "/"
}
listResponse, err := d.Bucket.List(path, "/", "", listPartsMax)
if err != nil {
return nil, err
}
files := []string{}
directories := []string{}
for {
for _, key := range listResponse.Contents {
files = append(files, key.Key)
}
for _, commonPrefix := range listResponse.CommonPrefixes {
directories = append(directories, commonPrefix[0:len(commonPrefix)-1])
}
if listResponse.IsTruncated {
listResponse, err = d.Bucket.List(path, "/", listResponse.NextMarker, listPartsMax)
if err != nil {
return nil, err
}
} else {
break
}
}
return append(files, directories...), nil
}
// Move moves an object stored at sourcePath to destPath, removing the original
// object.
func (d *Driver) Move(sourcePath string, destPath string) error {
/* This is terrible, but aws doesn't have an actual move. */
_, err := d.Bucket.PutCopy(destPath, getPermissions(),
s3.CopyOptions{Options: d.getOptions(), MetadataDirective: "", ContentType: d.getContentType()},
d.Bucket.Name+"/"+sourcePath)
if err != nil {
return storagedriver.PathNotFoundError{Path: sourcePath}
}
return d.Delete(sourcePath)
}
// Delete recursively deletes all objects stored at "path" and its subpaths.
func (d *Driver) Delete(path string) error {
listResponse, err := d.Bucket.List(path, "", "", listPartsMax)
if err != nil || len(listResponse.Contents) == 0 {
return storagedriver.PathNotFoundError{Path: 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{Quiet: false, Objects: 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 *Driver) 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
}
multi, err = d.Bucket.InitMulti(path, d.getContentType(), getPermissions(), d.getOptions())
return multi, err
}
func (d *Driver) 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 *Driver) getOptions() s3.Options {
return s3.Options{SSE: d.Encrypt}
}
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func getPermissions() s3.ACL {
return s3.Private
}
func (d *Driver) getContentType() string {
return "application/octet-stream"
}