distribution/registry/storage/driver/s3-aws/s3.go

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2014-12-22 22:24:45 +00:00
// Package s3 provides a storagedriver.StorageDriver implementation to
// store blobs in Amazon S3 cloud storage.
//
// This package leverages the official aws client library for interfacing with
// S3.
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//
// Because S3 is a key, value store the Stat call does not support last modification
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// time for directories (directories are an abstraction for key, value stores)
//
// Keep in mind that S3 guarantees only read-after-write consistency for new
// objects, but no read-after-update or list-after-write consistency.
package s3
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"reflect"
"strconv"
"strings"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/docker/distribution/context"
"github.com/docker/distribution/registry/client/transport"
storagedriver "github.com/docker/distribution/registry/storage/driver"
"github.com/docker/distribution/registry/storage/driver/base"
"github.com/docker/distribution/registry/storage/driver/factory"
)
const driverName = "s3aws"
// minChunkSize defines the minimum multipart upload chunk size
// S3 API requires multipart upload chunks to be at least 5MB
const minChunkSize = 5 << 20
const defaultChunkSize = 2 * minChunkSize
// listMax is the largest amount of objects you can request from S3 in a list call
const listMax = 1000
// validRegions maps known s3 region identifiers to region descriptors
var validRegions = map[string]struct{}{}
//DriverParameters A struct that encapsulates all of the driver parameters after all values have been set
type DriverParameters struct {
AccessKey string
SecretKey string
Bucket string
Region string
Encrypt bool
Secure bool
ChunkSize int64
RootDirectory string
StorageClass string
UserAgent string
}
func init() {
for _, region := range []string{
"us-east-1",
"us-west-1",
"us-west-2",
"eu-west-1",
"eu-central-1",
"ap-southeast-1",
"ap-southeast-2",
"ap-northeast-1",
"ap-northeast-2",
"sa-east-1",
} {
validRegions[region] = struct{}{}
}
// Register this as the default s3 driver in addition to s3aws
factory.Register("s3", &s3DriverFactory{})
factory.Register(driverName, &s3DriverFactory{})
}
// s3DriverFactory implements the factory.StorageDriverFactory interface
type s3DriverFactory struct{}
func (factory *s3DriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
return FromParameters(parameters)
}
type driver struct {
S3 *s3.S3
Bucket string
ChunkSize int64
Encrypt bool
RootDirectory string
StorageClass string
pool sync.Pool // pool []byte buffers used for WriteStream
zeros []byte // shared, zero-valued buffer used for WriteStream
}
type baseEmbed struct {
base.Base
}
// Driver is a storagedriver.StorageDriver implementation backed by Amazon S3
// Objects are stored at absolute keys in the provided bucket.
type Driver struct {
baseEmbed
}
// FromParameters constructs a new Driver with a given parameters map
// Required parameters:
// - accesskey
// - secretkey
// - region
// - bucket
// - encrypt
func FromParameters(parameters map[string]interface{}) (*Driver, error) {
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// Providing no values for these is valid in case the user is authenticating
// with an IAM on an ec2 instance (in which case the instance credentials will
// be summoned when GetAuth is called)
accessKey := parameters["accesskey"]
if accessKey == nil {
accessKey = ""
}
secretKey := parameters["secretkey"]
if secretKey == nil {
secretKey = ""
}
regionName, ok := parameters["region"]
if regionName == nil || fmt.Sprint(regionName) == "" {
return nil, fmt.Errorf("No region parameter provided")
}
region := fmt.Sprint(regionName)
_, ok = validRegions[region]
if !ok {
return nil, fmt.Errorf("Invalid region provided: %v", region)
}
bucket := parameters["bucket"]
if bucket == nil || fmt.Sprint(bucket) == "" {
return nil, fmt.Errorf("No bucket parameter provided")
}
encryptBool := false
encrypt := parameters["encrypt"]
switch encrypt := encrypt.(type) {
case string:
b, err := strconv.ParseBool(encrypt)
if err != nil {
return nil, fmt.Errorf("The encrypt parameter should be a boolean")
}
encryptBool = b
case bool:
encryptBool = encrypt
case nil:
// do nothing
default:
return nil, fmt.Errorf("The encrypt parameter should be a boolean")
}
secureBool := true
secure := parameters["secure"]
switch secure := secure.(type) {
case string:
b, err := strconv.ParseBool(secure)
if err != nil {
return nil, fmt.Errorf("The secure parameter should be a boolean")
}
secureBool = b
case bool:
secureBool = secure
case nil:
// do nothing
default:
return nil, fmt.Errorf("The secure parameter should be a boolean")
}
chunkSize := int64(defaultChunkSize)
chunkSizeParam := parameters["chunksize"]
switch v := chunkSizeParam.(type) {
case string:
vv, err := strconv.ParseInt(v, 0, 64)
if err != nil {
return nil, fmt.Errorf("chunksize parameter must be an integer, %v invalid", chunkSizeParam)
}
chunkSize = vv
case int64:
chunkSize = v
case int, uint, int32, uint32, uint64:
chunkSize = reflect.ValueOf(v).Convert(reflect.TypeOf(chunkSize)).Int()
case nil:
// do nothing
default:
return nil, fmt.Errorf("invalid value for chunksize: %#v", chunkSizeParam)
}
if chunkSize < minChunkSize {
return nil, fmt.Errorf("The chunksize %#v parameter should be a number that is larger than or equal to %d", chunkSize, minChunkSize)
}
rootDirectory := parameters["rootdirectory"]
if rootDirectory == nil {
rootDirectory = ""
}
storageClass := s3.StorageClassStandard
storageClassParam := parameters["storageclass"]
if storageClassParam != nil {
storageClassString, ok := storageClassParam.(string)
if !ok {
return nil, fmt.Errorf("The storageclass parameter must be one of %v, %v invalid", []string{s3.StorageClassStandard, s3.StorageClassReducedRedundancy}, storageClassParam)
}
// All valid storage class parameters are UPPERCASE, so be a bit more flexible here
storageClassString = strings.ToUpper(storageClassString)
if storageClassString != s3.StorageClassStandard && storageClassString != s3.StorageClassReducedRedundancy {
return nil, fmt.Errorf("The storageclass parameter must be one of %v, %v invalid", []string{s3.StorageClassStandard, s3.StorageClassReducedRedundancy}, storageClassParam)
}
storageClass = storageClassString
}
userAgent := parameters["useragent"]
if userAgent == nil {
userAgent = ""
}
params := DriverParameters{
fmt.Sprint(accessKey),
fmt.Sprint(secretKey),
fmt.Sprint(bucket),
region,
encryptBool,
secureBool,
chunkSize,
fmt.Sprint(rootDirectory),
storageClass,
fmt.Sprint(userAgent),
}
return New(params)
}
// New constructs a new Driver with the given AWS credentials, region, encryption flag, and
// bucketName
func New(params DriverParameters) (*Driver, error) {
awsConfig := aws.NewConfig()
creds := credentials.NewChainCredentials([]credentials.Provider{
&credentials.StaticProvider{
Value: credentials.Value{
AccessKeyID: params.AccessKey,
SecretAccessKey: params.SecretKey,
},
},
&credentials.EnvProvider{},
&credentials.SharedCredentialsProvider{},
&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(session.New())},
})
awsConfig.WithCredentials(creds)
awsConfig.WithRegion(params.Region)
awsConfig.WithDisableSSL(!params.Secure)
// awsConfig.WithMaxRetries(10)
if params.UserAgent != "" {
awsConfig.WithHTTPClient(&http.Client{
Transport: transport.NewTransport(http.DefaultTransport, transport.NewHeaderRequestModifier(http.Header{http.CanonicalHeaderKey("User-Agent"): []string{params.UserAgent}})),
})
}
s3obj := s3.New(session.New(awsConfig))
// TODO Currently multipart uploads have no timestamps, so this would be unwise
// if you initiated a new s3driver while another one is running on the same bucket.
// multis, _, err := bucket.ListMulti("", "")
// if err != nil {
// return nil, err
// }
// for _, multi := range multis {
// err := multi.Abort()
// //TODO appropriate to do this error checking?
// if err != nil {
// return nil, err
// }
// }
d := &driver{
S3: s3obj,
Bucket: params.Bucket,
ChunkSize: params.ChunkSize,
Encrypt: params.Encrypt,
RootDirectory: params.RootDirectory,
StorageClass: params.StorageClass,
zeros: make([]byte, params.ChunkSize),
}
d.pool.New = func() interface{} {
return make([]byte, d.ChunkSize)
}
return &Driver{
baseEmbed: baseEmbed{
Base: base.Base{
StorageDriver: d,
},
},
}, nil
}
// Implement the storagedriver.StorageDriver interface
func (d *driver) Name() string {
return driverName
}
// GetContent retrieves the content stored at "path" as a []byte.
func (d *driver) GetContent(ctx context.Context, path string) ([]byte, error) {
reader, err := d.ReadStream(ctx, path, 0)
if err != nil {
return nil, err
}
return ioutil.ReadAll(reader)
}
// PutContent stores the []byte content at a location designated by "path".
func (d *driver) PutContent(ctx context.Context, path string, contents []byte) error {
_, err := d.S3.PutObject(&s3.PutObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
ContentType: d.getContentType(),
ACL: d.getACL(),
ServerSideEncryption: d.getEncryptionMode(),
StorageClass: d.getStorageClass(),
Body: bytes.NewReader(contents),
})
return parseError(path, err)
}
// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
// given byte offset.
func (d *driver) ReadStream(ctx context.Context, path string, offset int64) (io.ReadCloser, error) {
resp, err := d.S3.GetObject(&s3.GetObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
Range: aws.String("bytes=" + strconv.FormatInt(offset, 10) + "-"),
})
if err != nil {
if s3Err, ok := err.(awserr.Error); ok && s3Err.Code() == "InvalidRange" {
return ioutil.NopCloser(bytes.NewReader(nil)), nil
}
return nil, parseError(path, err)
}
return resp.Body, nil
}
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// WriteStream stores the contents of the provided io.Reader at a
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// location designated by the given path. The driver will know it has
// received the full contents when the reader returns io.EOF. The number
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// of successfully READ bytes will be returned, even if an error is
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// returned. May be used to resume writing a stream by providing a nonzero
// offset. Offsets past the current size will write from the position
// beyond the end of the file.
func (d *driver) WriteStream(ctx context.Context, path string, offset int64, reader io.Reader) (totalRead int64, err error) {
var partNumber int64 = 1
bytesRead := 0
var putErrChan chan error
parts := []*s3.CompletedPart{}
done := make(chan struct{}) // stopgap to free up waiting goroutines
resp, err := d.S3.CreateMultipartUpload(&s3.CreateMultipartUploadInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
ContentType: d.getContentType(),
ACL: d.getACL(),
ServerSideEncryption: d.getEncryptionMode(),
StorageClass: d.getStorageClass(),
})
if err != nil {
return 0, err
}
uploadID := resp.UploadId
buf := d.getbuf()
// We never want to leave a dangling multipart upload, our only consistent state is
// when there is a whole object at path. This is in order to remain consistent with
// the stat call.
//
// Note that if the machine dies before executing the defer, we will be left with a dangling
// multipart upload, which will eventually be cleaned up, but we will lose all of the progress
// made prior to the machine crashing.
defer func() {
if putErrChan != nil {
if putErr := <-putErrChan; putErr != nil {
err = putErr
}
}
if len(parts) > 0 {
_, err := d.S3.CompleteMultipartUpload(&s3.CompleteMultipartUploadInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
UploadId: uploadID,
MultipartUpload: &s3.CompletedMultipartUpload{
Parts: parts,
},
})
if err != nil {
// TODO (brianbland): log errors here
d.S3.AbortMultipartUpload(&s3.AbortMultipartUploadInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
UploadId: uploadID,
})
}
}
d.putbuf(buf) // needs to be here to pick up new buf value
close(done) // free up any waiting goroutines
}()
// Fills from 0 to total from current
fromSmallCurrent := func(total int64) error {
current, err := d.ReadStream(ctx, path, 0)
if err != nil {
return err
}
bytesRead = 0
for int64(bytesRead) < total {
//The loop should very rarely enter a second iteration
nn, err := current.Read(buf[bytesRead:total])
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bytesRead += nn
if err != nil {
if err != io.EOF {
return err
}
break
}
}
return nil
}
// Fills from parameter to chunkSize from reader
fromReader := func(from int64) error {
bytesRead = 0
for from+int64(bytesRead) < d.ChunkSize {
nn, err := reader.Read(buf[from+int64(bytesRead):])
totalRead += int64(nn)
bytesRead += nn
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if err != nil {
if err != io.EOF {
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return err
}
break
}
}
if putErrChan == nil {
putErrChan = make(chan error)
} else {
if putErr := <-putErrChan; putErr != nil {
putErrChan = nil
return putErr
}
}
go func(bytesRead int, from int64, buf []byte) {
defer d.putbuf(buf) // this buffer gets dropped after this call
// DRAGONS(stevvooe): There are few things one might want to know
// about this section. First, the putErrChan is expecting an error
// and a nil or just a nil to come through the channel. This is
// covered by the silly defer below. The other aspect is the s3
// retry backoff to deal with RequestTimeout errors. Even though
// the underlying s3 library should handle it, it doesn't seem to
// be part of the shouldRetry function (see AdRoll/goamz/s3).
defer func() {
select {
case putErrChan <- nil: // for some reason, we do this no matter what.
case <-done:
return // ensure we don't leak the goroutine
}
}()
if bytesRead <= 0 {
return
}
resp, err := d.S3.UploadPart(&s3.UploadPartInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
PartNumber: aws.Int64(partNumber),
UploadId: uploadID,
Body: bytes.NewReader(buf[0 : int64(bytesRead)+from]),
})
if err != nil {
logrus.Errorf("error putting part, aborting: %v", err)
select {
case putErrChan <- err:
case <-done:
return // don't leak the goroutine
}
}
// parts and partNumber are safe, because this function is the
// only one modifying them and we force it to be executed
// serially.
parts = append(parts, &s3.CompletedPart{
ETag: resp.ETag,
PartNumber: aws.Int64(partNumber),
})
partNumber++
}(bytesRead, from, buf)
buf = d.getbuf() // use a new buffer for the next call
return nil
}
if offset > 0 {
resp, err := d.S3.HeadObject(&s3.HeadObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
})
if err != nil {
if s3Err, ok := err.(awserr.Error); !ok || s3Err.Code() != "NoSuchKey" {
return 0, err
}
}
currentLength := int64(0)
if err == nil && resp.ContentLength != nil {
currentLength = *resp.ContentLength
}
if currentLength >= offset {
if offset < d.ChunkSize {
// chunkSize > currentLength >= offset
if err = fromSmallCurrent(offset); err != nil {
return totalRead, err
}
if err = fromReader(offset); err != nil {
return totalRead, err
}
if totalRead+offset < d.ChunkSize {
return totalRead, nil
}
} else {
// currentLength >= offset >= chunkSize
resp, err := d.S3.UploadPartCopy(&s3.UploadPartCopyInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
PartNumber: aws.Int64(partNumber),
UploadId: uploadID,
CopySource: aws.String(d.Bucket + "/" + d.s3Path(path)),
CopySourceRange: aws.String("bytes=0-" + strconv.FormatInt(offset-1, 10)),
})
if err != nil {
return 0, err
}
parts = append(parts, &s3.CompletedPart{
ETag: resp.CopyPartResult.ETag,
PartNumber: aws.Int64(partNumber),
})
partNumber++
}
} else {
// Fills between parameters with 0s but only when to - from <= chunkSize
fromZeroFillSmall := func(from, to int64) error {
bytesRead = 0
for from+int64(bytesRead) < to {
nn, err := bytes.NewReader(d.zeros).Read(buf[from+int64(bytesRead) : to])
bytesRead += nn
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if err != nil {
return err
}
}
return nil
}
// Fills between parameters with 0s, making new parts
fromZeroFillLarge := func(from, to int64) error {
bytesRead64 := int64(0)
for to-(from+bytesRead64) >= d.ChunkSize {
resp, err := d.S3.UploadPart(&s3.UploadPartInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
PartNumber: aws.Int64(partNumber),
UploadId: uploadID,
Body: bytes.NewReader(d.zeros),
})
if err != nil {
return err
}
bytesRead64 += d.ChunkSize
parts = append(parts, &s3.CompletedPart{
ETag: resp.ETag,
PartNumber: aws.Int64(partNumber),
})
partNumber++
}
return fromZeroFillSmall(0, (to-from)%d.ChunkSize)
}
// currentLength < offset
if currentLength < d.ChunkSize {
if offset < d.ChunkSize {
// chunkSize > offset > currentLength
if err = fromSmallCurrent(currentLength); err != nil {
return totalRead, err
}
if err = fromZeroFillSmall(currentLength, offset); err != nil {
return totalRead, err
}
if err = fromReader(offset); err != nil {
return totalRead, err
}
if totalRead+offset < d.ChunkSize {
return totalRead, nil
}
} else {
// offset >= chunkSize > currentLength
if err = fromSmallCurrent(currentLength); err != nil {
return totalRead, err
}
if err = fromZeroFillSmall(currentLength, d.ChunkSize); err != nil {
return totalRead, err
}
resp, err := d.S3.UploadPart(&s3.UploadPartInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
PartNumber: aws.Int64(partNumber),
UploadId: uploadID,
Body: bytes.NewReader(buf),
})
if err != nil {
return totalRead, err
}
parts = append(parts, &s3.CompletedPart{
ETag: resp.ETag,
PartNumber: aws.Int64(partNumber),
})
partNumber++
//Zero fill from chunkSize up to offset, then some reader
if err = fromZeroFillLarge(d.ChunkSize, offset); err != nil {
return totalRead, err
}
if err = fromReader(offset % d.ChunkSize); err != nil {
return totalRead, err
}
if totalRead+(offset%d.ChunkSize) < d.ChunkSize {
return totalRead, nil
}
}
} else {
// offset > currentLength >= chunkSize
resp, err := d.S3.UploadPartCopy(&s3.UploadPartCopyInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
PartNumber: aws.Int64(partNumber),
UploadId: uploadID,
CopySource: aws.String(d.Bucket + "/" + d.s3Path(path)),
})
if err != nil {
return 0, err
}
parts = append(parts, &s3.CompletedPart{
ETag: resp.CopyPartResult.ETag,
PartNumber: aws.Int64(partNumber),
})
partNumber++
//Zero fill from currentLength up to offset, then some reader
if err = fromZeroFillLarge(currentLength, offset); err != nil {
return totalRead, err
}
if err = fromReader((offset - currentLength) % d.ChunkSize); err != nil {
return totalRead, err
}
if totalRead+((offset-currentLength)%d.ChunkSize) < d.ChunkSize {
return totalRead, nil
}
}
}
}
for {
if err = fromReader(0); err != nil {
return totalRead, err
}
if int64(bytesRead) < d.ChunkSize {
break
}
}
return totalRead, nil
}
// Stat retrieves the FileInfo for the given path, including the current size
// in bytes and the creation time.
func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo, error) {
resp, err := d.S3.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(d.Bucket),
Prefix: aws.String(d.s3Path(path)),
MaxKeys: aws.Int64(1),
})
if err != nil {
return nil, err
}
fi := storagedriver.FileInfoFields{
Path: path,
}
if len(resp.Contents) == 1 {
if *resp.Contents[0].Key != d.s3Path(path) {
fi.IsDir = true
} else {
fi.IsDir = false
fi.Size = *resp.Contents[0].Size
fi.ModTime = *resp.Contents[0].LastModified
}
} else if len(resp.CommonPrefixes) == 1 {
fi.IsDir = true
} else {
return nil, storagedriver.PathNotFoundError{Path: path}
}
return storagedriver.FileInfoInternal{FileInfoFields: fi}, nil
}
// List returns a list of the objects that are direct descendants of the given path.
func (d *driver) List(ctx context.Context, opath string) ([]string, error) {
path := opath
if path != "/" && path[len(path)-1] != '/' {
path = path + "/"
}
// This is to cover for the cases when the rootDirectory of the driver is either "" or "/".
// In those cases, there is no root prefix to replace and we must actually add a "/" to all
// results in order to keep them as valid paths as recognized by storagedriver.PathRegexp
prefix := ""
if d.s3Path("") == "" {
prefix = "/"
}
resp, err := d.S3.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(d.Bucket),
Prefix: aws.String(d.s3Path(path)),
Delimiter: aws.String("/"),
MaxKeys: aws.Int64(listMax),
})
if err != nil {
return nil, parseError(opath, err)
}
files := []string{}
directories := []string{}
for {
for _, key := range resp.Contents {
files = append(files, strings.Replace(*key.Key, d.s3Path(""), prefix, 1))
}
for _, commonPrefix := range resp.CommonPrefixes {
commonPrefix := *commonPrefix.Prefix
directories = append(directories, strings.Replace(commonPrefix[0:len(commonPrefix)-1], d.s3Path(""), prefix, 1))
}
if *resp.IsTruncated {
resp, err = d.S3.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(d.Bucket),
Prefix: aws.String(d.s3Path(path)),
Delimiter: aws.String("/"),
MaxKeys: aws.Int64(listMax),
Marker: resp.NextMarker,
})
if err != nil {
return nil, err
}
} else {
break
}
}
if opath != "/" {
if len(files) == 0 && len(directories) == 0 {
// Treat empty response as missing directory, since we don't actually
// have directories in s3.
return nil, storagedriver.PathNotFoundError{Path: opath}
}
}
return append(files, directories...), nil
}
// Move moves an object stored at sourcePath to destPath, removing the original
// object.
func (d *driver) Move(ctx context.Context, sourcePath string, destPath string) error {
/* This is terrible, but aws doesn't have an actual move. */
_, err := d.S3.CopyObject(&s3.CopyObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(destPath)),
ContentType: d.getContentType(),
ACL: d.getACL(),
ServerSideEncryption: d.getEncryptionMode(),
StorageClass: d.getStorageClass(),
CopySource: aws.String(d.Bucket + "/" + d.s3Path(sourcePath)),
})
if err != nil {
return parseError(sourcePath, err)
}
return d.Delete(ctx, sourcePath)
}
// Delete recursively deletes all objects stored at "path" and its subpaths.
func (d *driver) Delete(ctx context.Context, path string) error {
resp, err := d.S3.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(d.Bucket),
Prefix: aws.String(d.s3Path(path)),
})
if err != nil || len(resp.Contents) == 0 {
return storagedriver.PathNotFoundError{Path: path}
}
s3Objects := make([]*s3.ObjectIdentifier, 0, listMax)
for len(resp.Contents) > 0 {
for _, key := range resp.Contents {
s3Objects = append(s3Objects, &s3.ObjectIdentifier{
Key: key.Key,
})
}
_, err := d.S3.DeleteObjects(&s3.DeleteObjectsInput{
Bucket: aws.String(d.Bucket),
Delete: &s3.Delete{
Objects: s3Objects,
Quiet: aws.Bool(false),
},
})
if err != nil {
return nil
}
resp, err = d.S3.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(d.Bucket),
Prefix: aws.String(d.s3Path(path)),
})
if err != nil {
return err
}
}
return nil
}
// URLFor returns a URL which may be used to retrieve the content stored at the given path.
// May return an UnsupportedMethodErr in certain StorageDriver implementations.
func (d *driver) URLFor(ctx context.Context, path string, options map[string]interface{}) (string, error) {
methodString := "GET"
method, ok := options["method"]
if ok {
methodString, ok = method.(string)
if !ok || (methodString != "GET" && methodString != "HEAD") {
return "", storagedriver.ErrUnsupportedMethod{}
}
}
expiresIn := 20 * time.Minute
expires, ok := options["expiry"]
if ok {
et, ok := expires.(time.Time)
if ok {
expiresIn = et.Sub(time.Now())
}
}
var req *request.Request
switch methodString {
case "GET":
req, _ = d.S3.GetObjectRequest(&s3.GetObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
})
case "HEAD":
req, _ = d.S3.HeadObjectRequest(&s3.HeadObjectInput{
Bucket: aws.String(d.Bucket),
Key: aws.String(d.s3Path(path)),
})
default:
panic("unreachable")
}
return req.Presign(expiresIn)
}
func (d *driver) s3Path(path string) string {
return strings.TrimLeft(strings.TrimRight(d.RootDirectory, "/")+path, "/")
}
// S3BucketKey returns the s3 bucket key for the given storage driver path.
func (d *Driver) S3BucketKey(path string) string {
return d.StorageDriver.(*driver).s3Path(path)
}
func parseError(path string, err error) error {
if s3Err, ok := err.(awserr.Error); ok && s3Err.Code() == "NoSuchKey" {
return storagedriver.PathNotFoundError{Path: path}
}
return err
}
func (d *driver) getEncryptionMode() *string {
if d.Encrypt {
return aws.String("AES256")
}
return nil
}
func (d *driver) getContentType() *string {
return aws.String("application/octet-stream")
}
func (d *driver) getACL() *string {
return aws.String("private")
}
func (d *driver) getStorageClass() *string {
return aws.String(d.StorageClass)
}
// getbuf returns a buffer from the driver's pool with length d.ChunkSize.
func (d *driver) getbuf() []byte {
return d.pool.Get().([]byte)
}
func (d *driver) putbuf(p []byte) {
copy(p, d.zeros)
d.pool.Put(p)
}