forked from TrueCloudLab/distribution
144 lines
3.4 KiB
Go
144 lines
3.4 KiB
Go
// +build !noresumabledigest
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package storage
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import (
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"context"
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"encoding"
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"fmt"
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"hash"
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"path"
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"strconv"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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"github.com/sirupsen/logrus"
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)
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// resumeDigest attempts to restore the state of the internal hash function
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// by loading the most recent saved hash state equal to the current size of the blob.
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func (bw *blobWriter) resumeDigest(ctx context.Context) error {
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if !bw.resumableDigestEnabled {
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return errResumableDigestNotAvailable
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}
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h, ok := bw.digester.Hash().(encoding.BinaryUnmarshaler)
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if !ok {
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return errResumableDigestNotAvailable
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}
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offset := bw.fileWriter.Size()
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if offset == bw.written {
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// State of digester is already at the requested offset.
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return nil
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}
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// List hash states from storage backend.
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var hashStateMatch hashStateEntry
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hashStates, err := bw.getStoredHashStates(ctx)
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if err != nil {
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return fmt.Errorf("unable to get stored hash states with offset %d: %s", offset, err)
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}
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// Find the highest stored hashState with offset equal to
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// the requested offset.
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for _, hashState := range hashStates {
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if hashState.offset == offset {
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hashStateMatch = hashState
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break // Found an exact offset match.
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}
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}
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if hashStateMatch.offset == 0 {
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// No need to load any state, just reset the hasher.
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h.(hash.Hash).Reset()
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} else {
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storedState, err := bw.driver.GetContent(ctx, hashStateMatch.path)
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if err != nil {
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return err
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}
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if err = h.UnmarshalBinary(storedState); err != nil {
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return err
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}
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bw.written = hashStateMatch.offset
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}
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// Mind the gap.
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if gapLen := offset - bw.written; gapLen > 0 {
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return errResumableDigestNotAvailable
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}
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return nil
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}
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type hashStateEntry struct {
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offset int64
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path string
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}
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// getStoredHashStates returns a slice of hashStateEntries for this upload.
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func (bw *blobWriter) getStoredHashStates(ctx context.Context) ([]hashStateEntry, error) {
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uploadHashStatePathPrefix, err := pathFor(uploadHashStatePathSpec{
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name: bw.blobStore.repository.Named().String(),
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id: bw.id,
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alg: bw.digester.Digest().Algorithm(),
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list: true,
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})
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if err != nil {
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return nil, err
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}
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paths, err := bw.blobStore.driver.List(ctx, uploadHashStatePathPrefix)
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if err != nil {
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if _, ok := err.(storagedriver.PathNotFoundError); !ok {
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return nil, err
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}
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// Treat PathNotFoundError as no entries.
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paths = nil
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}
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hashStateEntries := make([]hashStateEntry, 0, len(paths))
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for _, p := range paths {
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pathSuffix := path.Base(p)
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// The suffix should be the offset.
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offset, err := strconv.ParseInt(pathSuffix, 0, 64)
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if err != nil {
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logrus.Errorf("unable to parse offset from upload state path %q: %s", p, err)
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}
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hashStateEntries = append(hashStateEntries, hashStateEntry{offset: offset, path: p})
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}
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return hashStateEntries, nil
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}
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func (bw *blobWriter) storeHashState(ctx context.Context) error {
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if !bw.resumableDigestEnabled {
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return errResumableDigestNotAvailable
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}
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h, ok := bw.digester.Hash().(encoding.BinaryMarshaler)
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if !ok {
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return errResumableDigestNotAvailable
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}
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state, err := h.MarshalBinary()
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if err != nil {
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return err
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}
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uploadHashStatePath, err := pathFor(uploadHashStatePathSpec{
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name: bw.blobStore.repository.Named().String(),
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id: bw.id,
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alg: bw.digester.Digest().Algorithm(),
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offset: bw.written,
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})
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if err != nil {
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return err
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}
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return bw.driver.PutContent(ctx, uploadHashStatePath, state)
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}
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