forked from mirrors/docker-distribution
Support FileWriter interface for OSS storage driver
Change-Id: Ie5533ad85f944800499ca1040fd67bf1378815e0 Signed-off-by: Li Yi <denverdino@gmail.com>
This commit is contained in:
Li Yi
Brian Bland
parent
307504713f
commit
a9bf7a2aae
|
|
@ -13,7 +13,7 @@ import (
|
|||
_ "github.com/docker/distribution/registry/storage/driver/gcs"
|
||||
_ "github.com/docker/distribution/registry/storage/driver/inmemory"
|
||||
_ "github.com/docker/distribution/registry/storage/driver/middleware/cloudfront"
|
||||
// _ "github.com/docker/distribution/registry/storage/driver/oss"
|
||||
_ "github.com/docker/distribution/registry/storage/driver/oss"
|
||||
_ "github.com/docker/distribution/registry/storage/driver/s3-aws"
|
||||
_ "github.com/docker/distribution/registry/storage/driver/s3-goamz"
|
||||
// _ "github.com/docker/distribution/registry/storage/driver/swift"
|
||||
|
|
|
|||
|
|
@ -20,7 +20,6 @@ import (
|
|||
"reflect"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/docker/distribution/context"
|
||||
|
|
@ -75,9 +74,6 @@ type driver struct {
|
|||
ChunkSize int64
|
||||
Encrypt bool
|
||||
RootDirectory string
|
||||
|
||||
pool sync.Pool // pool []byte buffers used for WriteStream
|
||||
zeros []byte // shared, zero-valued buffer used for WriteStream
|
||||
}
|
||||
|
||||
type baseEmbed struct {
|
||||
|
|
@ -99,8 +95,7 @@ type Driver struct {
|
|||
// - encrypt
|
||||
func FromParameters(parameters map[string]interface{}) (*Driver, error) {
|
||||
// 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, ok := parameters["accesskeyid"]
|
||||
if !ok {
|
||||
return nil, fmt.Errorf("No accesskeyid parameter provided")
|
||||
|
|
@ -220,11 +215,6 @@ func New(params DriverParameters) (*Driver, error) {
|
|||
ChunkSize: params.ChunkSize,
|
||||
Encrypt: params.Encrypt,
|
||||
RootDirectory: params.RootDirectory,
|
||||
zeros: make([]byte, params.ChunkSize),
|
||||
}
|
||||
|
||||
d.pool.New = func() interface{} {
|
||||
return make([]byte, d.ChunkSize)
|
||||
}
|
||||
|
||||
return &Driver{
|
||||
|
|
@ -256,9 +246,9 @@ func (d *driver) PutContent(ctx context.Context, path string, contents []byte) e
|
|||
return parseError(path, d.Bucket.Put(d.ossPath(path), contents, d.getContentType(), getPermissions(), d.getOptions()))
|
||||
}
|
||||
|
||||
// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
|
||||
// Reader 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) {
|
||||
func (d *driver) Reader(ctx context.Context, path string, offset int64) (io.ReadCloser, error) {
|
||||
headers := make(http.Header)
|
||||
headers.Add("Range", "bytes="+strconv.FormatInt(offset, 10)+"-")
|
||||
|
||||
|
|
@ -279,315 +269,37 @@ func (d *driver) ReadStream(ctx context.Context, path string, offset int64) (io.
|
|||
return resp.Body, nil
|
||||
}
|
||||
|
||||
// WriteStream stores the contents of the provided io.Reader at a
|
||||
// location designated by the given path. The driver will know it has
|
||||
// received the full contents when the reader returns io.EOF. The number
|
||||
// of successfully READ bytes will be returned, even if an error is
|
||||
// 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) {
|
||||
partNumber := 1
|
||||
bytesRead := 0
|
||||
var putErrChan chan error
|
||||
parts := []oss.Part{}
|
||||
var part oss.Part
|
||||
done := make(chan struct{}) // stopgap to free up waiting goroutines
|
||||
|
||||
multi, err := d.Bucket.InitMulti(d.ossPath(path), d.getContentType(), getPermissions(), d.getOptions())
|
||||
// Writer returns a FileWriter which will store the content written to it
|
||||
// at the location designated by "path" after the call to Commit.
|
||||
func (d *driver) Writer(ctx context.Context, path string, append bool) (storagedriver.FileWriter, error) {
|
||||
key := d.ossPath(path)
|
||||
if !append {
|
||||
// TODO (brianbland): cancel other uploads at this path
|
||||
multi, err := d.Bucket.InitMulti(key, d.getContentType(), getPermissions(), d.getOptions())
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return d.newWriter(key, multi, nil), nil
|
||||
}
|
||||
multis, _, err := d.Bucket.ListMulti(key, "")
|
||||
if err != nil {
|
||||
return 0, err
|
||||
return nil, parseError(path, err)
|
||||
}
|
||||
|
||||
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
|
||||
}
|
||||
for _, multi := range multis {
|
||||
if key != multi.Key {
|
||||
continue
|
||||
}
|
||||
|
||||
if len(parts) > 0 {
|
||||
if multi == nil {
|
||||
// Parts should be empty if the multi is not initialized
|
||||
panic("Unreachable")
|
||||
} else {
|
||||
if multi.Complete(parts) != nil {
|
||||
multi.Abort()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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)
|
||||
parts, err := multi.ListParts()
|
||||
if err != nil {
|
||||
return err
|
||||
return nil, parseError(path, err)
|
||||
}
|
||||
|
||||
bytesRead = 0
|
||||
for int64(bytesRead) < total {
|
||||
//The loop should very rarely enter a second iteration
|
||||
nn, err := current.Read(buf[bytesRead:total])
|
||||
bytesRead += nn
|
||||
if err != nil {
|
||||
if err != io.EOF {
|
||||
return err
|
||||
}
|
||||
|
||||
break
|
||||
}
|
||||
|
||||
var multiSize int64
|
||||
for _, part := range parts {
|
||||
multiSize += part.Size
|
||||
}
|
||||
return nil
|
||||
return d.newWriter(key, multi, parts), 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
|
||||
|
||||
if err != nil {
|
||||
if err != io.EOF {
|
||||
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 OSS
|
||||
// retry backoff to deal with RequestTimeout errors. Even though
|
||||
// the underlying OSS library should handle it, it doesn't seem to
|
||||
// be part of the shouldRetry function (see denverdino/aliyungo/oss).
|
||||
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
|
||||
}
|
||||
|
||||
var err error
|
||||
var part oss.Part
|
||||
|
||||
part, err = multi.PutPartWithTimeout(int(partNumber), bytes.NewReader(buf[0:int64(bytesRead)+from]), defaultTimeout)
|
||||
|
||||
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, part)
|
||||
partNumber++
|
||||
}(bytesRead, from, buf)
|
||||
|
||||
buf = d.getbuf() // use a new buffer for the next call
|
||||
return nil
|
||||
}
|
||||
|
||||
if offset > 0 {
|
||||
resp, err := d.Bucket.Head(d.ossPath(path), nil)
|
||||
if err != nil {
|
||||
if ossErr, ok := err.(*oss.Error); !ok || ossErr.StatusCode != http.StatusNotFound {
|
||||
return 0, err
|
||||
}
|
||||
}
|
||||
|
||||
currentLength := int64(0)
|
||||
if err == 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
|
||||
_, part, err = multi.PutPartCopy(partNumber,
|
||||
oss.CopyOptions{CopySourceOptions: "bytes=0-" + strconv.FormatInt(offset-1, 10)},
|
||||
d.Bucket.Path(d.ossPath(path)))
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
parts = append(parts, part)
|
||||
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
|
||||
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 {
|
||||
part, err := multi.PutPartWithTimeout(int(partNumber), bytes.NewReader(d.zeros), defaultTimeout)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
bytesRead64 += d.ChunkSize
|
||||
|
||||
parts = append(parts, part)
|
||||
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
|
||||
}
|
||||
|
||||
part, err = multi.PutPartWithTimeout(int(partNumber), bytes.NewReader(buf), defaultTimeout)
|
||||
if err != nil {
|
||||
return totalRead, err
|
||||
}
|
||||
|
||||
parts = append(parts, part)
|
||||
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
|
||||
_, part, err = multi.PutPartCopy(partNumber,
|
||||
oss.CopyOptions{},
|
||||
d.Bucket.Path(d.ossPath(path)))
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
parts = append(parts, part)
|
||||
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
|
||||
return nil, storagedriver.PathNotFoundError{Path: path}
|
||||
}
|
||||
|
||||
// Stat retrieves the FileInfo for the given path, including the current size
|
||||
|
|
@ -778,12 +490,181 @@ func (d *driver) getContentType() string {
|
|||
return "application/octet-stream"
|
||||
}
|
||||
|
||||
// getbuf returns a buffer from the driver's pool with length d.ChunkSize.
|
||||
func (d *driver) getbuf() []byte {
|
||||
return d.pool.Get().([]byte)
|
||||
// writer attempts to upload parts to S3 in a buffered fashion where the last
|
||||
// part is at least as large as the chunksize, so the multipart upload could be
|
||||
// cleanly resumed in the future. This is violated if Close is called after less
|
||||
// than a full chunk is written.
|
||||
type writer struct {
|
||||
driver *driver
|
||||
key string
|
||||
multi *oss.Multi
|
||||
parts []oss.Part
|
||||
size int64
|
||||
readyPart []byte
|
||||
pendingPart []byte
|
||||
closed bool
|
||||
committed bool
|
||||
cancelled bool
|
||||
}
|
||||
|
||||
func (d *driver) putbuf(p []byte) {
|
||||
copy(p, d.zeros)
|
||||
d.pool.Put(p)
|
||||
func (d *driver) newWriter(key string, multi *oss.Multi, parts []oss.Part) storagedriver.FileWriter {
|
||||
var size int64
|
||||
for _, part := range parts {
|
||||
size += part.Size
|
||||
}
|
||||
return &writer{
|
||||
driver: d,
|
||||
key: key,
|
||||
multi: multi,
|
||||
parts: parts,
|
||||
size: size,
|
||||
}
|
||||
}
|
||||
|
||||
func (w *writer) Write(p []byte) (int, error) {
|
||||
if w.closed {
|
||||
return 0, fmt.Errorf("already closed")
|
||||
} else if w.committed {
|
||||
return 0, fmt.Errorf("already committed")
|
||||
} else if w.cancelled {
|
||||
return 0, fmt.Errorf("already cancelled")
|
||||
}
|
||||
|
||||
// If the last written part is smaller than minChunkSize, we need to make a
|
||||
// new multipart upload :sadface:
|
||||
if len(w.parts) > 0 && int(w.parts[len(w.parts)-1].Size) < minChunkSize {
|
||||
err := w.multi.Complete(w.parts)
|
||||
if err != nil {
|
||||
w.multi.Abort()
|
||||
return 0, err
|
||||
}
|
||||
|
||||
multi, err := w.driver.Bucket.InitMulti(w.key, w.driver.getContentType(), getPermissions(), w.driver.getOptions())
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
w.multi = multi
|
||||
|
||||
// If the entire written file is smaller than minChunkSize, we need to make
|
||||
// a new part from scratch :double sad face:
|
||||
if w.size < minChunkSize {
|
||||
contents, err := w.driver.Bucket.Get(w.key)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
w.parts = nil
|
||||
w.readyPart = contents
|
||||
} else {
|
||||
// Otherwise we can use the old file as the new first part
|
||||
_, part, err := multi.PutPartCopy(1, oss.CopyOptions{}, w.driver.Bucket.Name+"/"+w.key)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
w.parts = []oss.Part{part}
|
||||
}
|
||||
}
|
||||
|
||||
var n int
|
||||
|
||||
for len(p) > 0 {
|
||||
// If no parts are ready to write, fill up the first part
|
||||
if neededBytes := int(w.driver.ChunkSize) - len(w.readyPart); neededBytes > 0 {
|
||||
if len(p) >= neededBytes {
|
||||
w.readyPart = append(w.readyPart, p[:neededBytes]...)
|
||||
n += neededBytes
|
||||
p = p[neededBytes:]
|
||||
} else {
|
||||
w.readyPart = append(w.readyPart, p...)
|
||||
n += len(p)
|
||||
p = nil
|
||||
}
|
||||
}
|
||||
|
||||
if neededBytes := int(w.driver.ChunkSize) - len(w.pendingPart); neededBytes > 0 {
|
||||
if len(p) >= neededBytes {
|
||||
w.pendingPart = append(w.pendingPart, p[:neededBytes]...)
|
||||
n += neededBytes
|
||||
p = p[neededBytes:]
|
||||
err := w.flushPart()
|
||||
if err != nil {
|
||||
w.size += int64(n)
|
||||
return n, err
|
||||
}
|
||||
} else {
|
||||
w.pendingPart = append(w.pendingPart, p...)
|
||||
n += len(p)
|
||||
p = nil
|
||||
}
|
||||
}
|
||||
}
|
||||
w.size += int64(n)
|
||||
return n, nil
|
||||
}
|
||||
|
||||
func (w *writer) Size() int64 {
|
||||
return w.size
|
||||
}
|
||||
|
||||
func (w *writer) Close() error {
|
||||
if w.closed {
|
||||
return fmt.Errorf("already closed")
|
||||
}
|
||||
w.closed = true
|
||||
return w.flushPart()
|
||||
}
|
||||
|
||||
func (w *writer) Cancel() error {
|
||||
if w.closed {
|
||||
return fmt.Errorf("already closed")
|
||||
} else if w.committed {
|
||||
return fmt.Errorf("already committed")
|
||||
}
|
||||
w.cancelled = true
|
||||
err := w.multi.Abort()
|
||||
return err
|
||||
}
|
||||
|
||||
func (w *writer) Commit() error {
|
||||
if w.closed {
|
||||
return fmt.Errorf("already closed")
|
||||
} else if w.committed {
|
||||
return fmt.Errorf("already committed")
|
||||
} else if w.cancelled {
|
||||
return fmt.Errorf("already cancelled")
|
||||
}
|
||||
err := w.flushPart()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
w.committed = true
|
||||
err = w.multi.Complete(w.parts)
|
||||
if err != nil {
|
||||
w.multi.Abort()
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// flushPart flushes buffers to write a part to S3.
|
||||
// Only called by Write (with both buffers full) and Close/Commit (always)
|
||||
func (w *writer) flushPart() error {
|
||||
if len(w.readyPart) == 0 && len(w.pendingPart) == 0 {
|
||||
// nothing to write
|
||||
return nil
|
||||
}
|
||||
if len(w.pendingPart) < int(w.driver.ChunkSize) {
|
||||
// closing with a small pending part
|
||||
// combine ready and pending to avoid writing a small part
|
||||
w.readyPart = append(w.readyPart, w.pendingPart...)
|
||||
w.pendingPart = nil
|
||||
}
|
||||
|
||||
part, err := w.multi.PutPart(len(w.parts)+1, bytes.NewReader(w.readyPart))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
w.parts = append(w.parts, part)
|
||||
w.readyPart = w.pendingPart
|
||||
w.pendingPart = nil
|
||||
return nil
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue