155 lines
3.7 KiB
Go
155 lines
3.7 KiB
Go
// +build !noresumabledigest
|
|
|
|
package storage
|
|
|
|
import (
|
|
"context"
|
|
"encoding"
|
|
"fmt"
|
|
"hash"
|
|
"path"
|
|
"strconv"
|
|
|
|
storagedriver "github.com/docker/distribution/registry/storage/driver"
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// resumeDigest attempts to restore the state of the internal hash function
|
|
// by loading the most recent saved hash state equal to the current size of the blob.
|
|
func (bw *blobWriter) resumeDigest(ctx context.Context) error {
|
|
if !bw.resumableDigestEnabled {
|
|
return errResumableDigestNotAvailable
|
|
}
|
|
|
|
h, ok := bw.digester.Hash().(encoding.BinaryMarshaler)
|
|
if !ok {
|
|
return errResumableDigestNotAvailable
|
|
}
|
|
|
|
state, err := h.MarshalBinary()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
offset := bw.fileWriter.Size()
|
|
if offset == int64(len(state)) {
|
|
// State of digester is already at the requested offset.
|
|
return nil
|
|
}
|
|
|
|
// List hash states from storage backend.
|
|
var hashStateMatch hashStateEntry
|
|
hashStates, err := bw.getStoredHashStates(ctx)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to get stored hash states with offset %d: %s", offset, err)
|
|
}
|
|
|
|
// Find the highest stored hashState with offset equal to
|
|
// the requested offset.
|
|
for _, hashState := range hashStates {
|
|
if hashState.offset == offset {
|
|
hashStateMatch = hashState
|
|
break // Found an exact offset match.
|
|
}
|
|
}
|
|
|
|
if hashStateMatch.offset == 0 {
|
|
// No need to load any state, just reset the hasher.
|
|
h.(hash.Hash).Reset()
|
|
} else {
|
|
storedState, err := bw.driver.GetContent(ctx, hashStateMatch.path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// This type assertion is safe since we already did an assertion at the beginning
|
|
if err = h.(encoding.BinaryUnmarshaler).UnmarshalBinary(storedState); err != nil {
|
|
return err
|
|
}
|
|
|
|
state, err = h.(encoding.BinaryMarshaler).MarshalBinary()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Mind the gap.
|
|
if gapLen := offset - int64(len(state)); gapLen > 0 {
|
|
return errResumableDigestNotAvailable
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type hashStateEntry struct {
|
|
offset int64
|
|
path string
|
|
}
|
|
|
|
// getStoredHashStates returns a slice of hashStateEntries for this upload.
|
|
func (bw *blobWriter) getStoredHashStates(ctx context.Context) ([]hashStateEntry, error) {
|
|
uploadHashStatePathPrefix, err := pathFor(uploadHashStatePathSpec{
|
|
name: bw.blobStore.repository.Named().String(),
|
|
id: bw.id,
|
|
alg: bw.digester.Digest().Algorithm(),
|
|
list: true,
|
|
})
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
paths, err := bw.blobStore.driver.List(ctx, uploadHashStatePathPrefix)
|
|
if err != nil {
|
|
if _, ok := err.(storagedriver.PathNotFoundError); !ok {
|
|
return nil, err
|
|
}
|
|
// Treat PathNotFoundError as no entries.
|
|
paths = nil
|
|
}
|
|
|
|
hashStateEntries := make([]hashStateEntry, 0, len(paths))
|
|
|
|
for _, p := range paths {
|
|
pathSuffix := path.Base(p)
|
|
// The suffix should be the offset.
|
|
offset, err := strconv.ParseInt(pathSuffix, 0, 64)
|
|
if err != nil {
|
|
logrus.Errorf("unable to parse offset from upload state path %q: %s", p, err)
|
|
}
|
|
|
|
hashStateEntries = append(hashStateEntries, hashStateEntry{offset: offset, path: p})
|
|
}
|
|
|
|
return hashStateEntries, nil
|
|
}
|
|
|
|
func (bw *blobWriter) storeHashState(ctx context.Context) error {
|
|
if !bw.resumableDigestEnabled {
|
|
return errResumableDigestNotAvailable
|
|
}
|
|
|
|
h, ok := bw.digester.Hash().(encoding.BinaryMarshaler)
|
|
if !ok {
|
|
return errResumableDigestNotAvailable
|
|
}
|
|
|
|
state, err := h.MarshalBinary()
|
|
if err != nil {
|
|
return fmt.Errorf("could not marshal: %v", err)
|
|
}
|
|
|
|
uploadHashStatePath, err := pathFor(uploadHashStatePathSpec{
|
|
name: bw.blobStore.repository.Named().String(),
|
|
id: bw.id,
|
|
alg: bw.digester.Digest().Algorithm(),
|
|
offset: int64(len(state)),
|
|
})
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return bw.driver.PutContent(ctx, uploadHashStatePath, state)
|
|
}
|