forked from TrueCloudLab/distribution
Merge pull request #1006 from RichardScothern/proxy-serialize
Fix a race condition in pull through cache population
This commit is contained in:
Richard Scothern
commit
0ce983b4e8
3 changed files with 260 additions and 175 deletions
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@ -22,15 +22,10 @@ type proxyBlobStore struct {
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scheduler *scheduler.TTLExpirationScheduler
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}
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var _ distribution.BlobStore = proxyBlobStore{}
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type inflightBlob struct {
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refCount int
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bw distribution.BlobWriter
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}
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var _ distribution.BlobStore = &proxyBlobStore{}
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// inflight tracks currently downloading blobs
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var inflight = make(map[digest.Digest]*inflightBlob)
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var inflight = make(map[digest.Digest]struct{})
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// mu protects inflight
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var mu sync.Mutex
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@ -42,140 +37,113 @@ func setResponseHeaders(w http.ResponseWriter, length int64, mediaType string, d
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w.Header().Set("Etag", digest.String())
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}
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func (pbs proxyBlobStore) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
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desc, err := pbs.localStore.Stat(ctx, dgst)
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if err != nil && err != distribution.ErrBlobUnknown {
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return err
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}
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if err == nil {
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proxyMetrics.BlobPush(uint64(desc.Size))
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return pbs.localStore.ServeBlob(ctx, w, r, dgst)
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}
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desc, err = pbs.remoteStore.Stat(ctx, dgst)
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func (pbs *proxyBlobStore) copyContent(ctx context.Context, dgst digest.Digest, writer io.Writer) (distribution.Descriptor, error) {
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desc, err := pbs.remoteStore.Stat(ctx, dgst)
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if err != nil {
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return err
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return distribution.Descriptor{}, err
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}
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if w, ok := writer.(http.ResponseWriter); ok {
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setResponseHeaders(w, desc.Size, desc.MediaType, dgst)
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}
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remoteReader, err := pbs.remoteStore.Open(ctx, dgst)
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if err != nil {
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return err
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return distribution.Descriptor{}, err
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}
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bw, isNew, cleanup, err := getOrCreateBlobWriter(ctx, pbs.localStore, desc)
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_, err = io.CopyN(writer, remoteReader, desc.Size)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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proxyMetrics.BlobPush(uint64(desc.Size))
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return desc, nil
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}
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func (pbs *proxyBlobStore) serveLocal(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) (bool, error) {
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localDesc, err := pbs.localStore.Stat(ctx, dgst)
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if err != nil {
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// Stat can report a zero sized file here if it's checked between creation
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// and population. Return nil error, and continue
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return false, nil
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}
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if err == nil {
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proxyMetrics.BlobPush(uint64(localDesc.Size))
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return true, pbs.localStore.ServeBlob(ctx, w, r, dgst)
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}
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return false, nil
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}
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func (pbs *proxyBlobStore) storeLocal(ctx context.Context, dgst digest.Digest) error {
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defer func() {
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mu.Lock()
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delete(inflight, dgst)
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mu.Unlock()
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}()
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var desc distribution.Descriptor
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var err error
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var bw distribution.BlobWriter
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bw, err = pbs.localStore.Create(ctx)
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if err != nil {
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return err
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}
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defer cleanup()
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if isNew {
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go func() {
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err := streamToStorage(ctx, remoteReader, desc, bw)
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if err != nil {
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context.GetLogger(ctx).Error(err)
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}
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desc, err = pbs.copyContent(ctx, dgst, bw)
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if err != nil {
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return err
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}
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proxyMetrics.BlobPull(uint64(desc.Size))
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}()
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err := streamToClient(ctx, w, desc, bw)
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if err != nil {
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return err
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}
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_, err = bw.Commit(ctx, desc)
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if err != nil {
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return err
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}
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proxyMetrics.BlobPush(uint64(desc.Size))
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pbs.scheduler.AddBlob(dgst.String(), blobTTL)
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return nil
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}
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func (pbs *proxyBlobStore) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
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served, err := pbs.serveLocal(ctx, w, r, dgst)
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if err != nil {
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context.GetLogger(ctx).Errorf("Error serving blob from local storage: %s", err.Error())
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return err
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}
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if served {
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return nil
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}
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err = streamToClient(ctx, w, desc, bw)
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if err != nil {
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return err
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}
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proxyMetrics.BlobPush(uint64(desc.Size))
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return nil
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}
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type cleanupFunc func()
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// getOrCreateBlobWriter will track which blobs are currently being downloaded and enable client requesting
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// the same blob concurrently to read from the existing stream.
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func getOrCreateBlobWriter(ctx context.Context, blobs distribution.BlobService, desc distribution.Descriptor) (distribution.BlobWriter, bool, cleanupFunc, error) {
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mu.Lock()
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defer mu.Unlock()
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dgst := desc.Digest
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cleanup := func() {
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mu.Lock()
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defer mu.Unlock()
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inflight[dgst].refCount--
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if inflight[dgst].refCount == 0 {
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defer delete(inflight, dgst)
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_, err := inflight[dgst].bw.Commit(ctx, desc)
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if err != nil {
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// There is a narrow race here where Commit can be called while this blob's TTL is expiring
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// and its being removed from storage. In that case, the client stream will continue
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// uninterruped and the blob will be pulled through on the next request, so just log it
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context.GetLogger(ctx).Errorf("Error committing blob: %q", err)
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}
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}
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}
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var bw distribution.BlobWriter
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_, ok := inflight[dgst]
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if ok {
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bw = inflight[dgst].bw
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inflight[dgst].refCount++
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return bw, false, cleanup, nil
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mu.Unlock()
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_, err := pbs.copyContent(ctx, dgst, w)
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return err
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}
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inflight[dgst] = struct{}{}
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mu.Unlock()
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var err error
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bw, err = blobs.Create(ctx)
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if err != nil {
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return nil, false, nil, err
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}
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go func(dgst digest.Digest) {
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if err := pbs.storeLocal(ctx, dgst); err != nil {
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context.GetLogger(ctx).Errorf("Error committing to storage: %s", err.Error())
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}
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pbs.scheduler.AddBlob(dgst.String(), repositoryTTL)
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}(dgst)
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inflight[dgst] = &inflightBlob{refCount: 1, bw: bw}
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return bw, true, cleanup, nil
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}
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func streamToStorage(ctx context.Context, remoteReader distribution.ReadSeekCloser, desc distribution.Descriptor, bw distribution.BlobWriter) error {
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_, err := io.CopyN(bw, remoteReader, desc.Size)
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_, err = pbs.copyContent(ctx, dgst, w)
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if err != nil {
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return err
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}
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return nil
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}
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func streamToClient(ctx context.Context, w http.ResponseWriter, desc distribution.Descriptor, bw distribution.BlobWriter) error {
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setResponseHeaders(w, desc.Size, desc.MediaType, desc.Digest)
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reader, err := bw.Reader()
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if err != nil {
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return err
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}
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defer reader.Close()
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teeReader := io.TeeReader(reader, w)
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buf := make([]byte, 32768, 32786)
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var soFar int64
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for {
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rd, err := teeReader.Read(buf)
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if err == nil || err == io.EOF {
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soFar += int64(rd)
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if soFar < desc.Size {
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// buffer underflow, keep trying
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continue
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}
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return nil
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}
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return err
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}
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}
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func (pbs proxyBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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func (pbs *proxyBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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desc, err := pbs.localStore.Stat(ctx, dgst)
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if err == nil {
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return desc, err
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@ -189,26 +157,26 @@ func (pbs proxyBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distrib
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}
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// Unsupported functions
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func (pbs proxyBlobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
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func (pbs *proxyBlobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
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return distribution.Descriptor{}, distribution.ErrUnsupported
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}
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func (pbs proxyBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
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func (pbs *proxyBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
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return nil, distribution.ErrUnsupported
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}
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func (pbs proxyBlobStore) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
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func (pbs *proxyBlobStore) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
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return nil, distribution.ErrUnsupported
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}
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func (pbs proxyBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
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func (pbs *proxyBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
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return nil, distribution.ErrUnsupported
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}
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func (pbs proxyBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
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func (pbs *proxyBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
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return nil, distribution.ErrUnsupported
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}
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func (pbs proxyBlobStore) Delete(ctx context.Context, dgst digest.Digest) error {
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func (pbs *proxyBlobStore) Delete(ctx context.Context, dgst digest.Digest) error {
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return distribution.ErrUnsupported
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}
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@ -1,10 +1,13 @@
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package proxy
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import (
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"fmt"
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"io/ioutil"
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"math/rand"
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"net/http"
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"net/http/httptest"
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"sync"
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"testing"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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@ -12,75 +15,119 @@ import (
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"github.com/docker/distribution/registry/proxy/scheduler"
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"github.com/docker/distribution/registry/storage"
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"github.com/docker/distribution/registry/storage/cache/memory"
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"github.com/docker/distribution/registry/storage/driver/filesystem"
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"github.com/docker/distribution/registry/storage/driver/inmemory"
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)
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var sbsMu sync.Mutex
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type statsBlobStore struct {
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stats map[string]int
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blobs distribution.BlobStore
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}
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func (sbs statsBlobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
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sbsMu.Lock()
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sbs.stats["put"]++
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sbsMu.Unlock()
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return sbs.blobs.Put(ctx, mediaType, p)
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}
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func (sbs statsBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
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sbsMu.Lock()
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sbs.stats["get"]++
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sbsMu.Unlock()
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return sbs.blobs.Get(ctx, dgst)
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}
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func (sbs statsBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
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sbsMu.Lock()
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sbs.stats["create"]++
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sbsMu.Unlock()
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return sbs.blobs.Create(ctx)
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}
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func (sbs statsBlobStore) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
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sbsMu.Lock()
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sbs.stats["resume"]++
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sbsMu.Unlock()
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return sbs.blobs.Resume(ctx, id)
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}
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func (sbs statsBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
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sbsMu.Lock()
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sbs.stats["open"]++
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sbsMu.Unlock()
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return sbs.blobs.Open(ctx, dgst)
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}
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func (sbs statsBlobStore) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
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sbsMu.Lock()
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sbs.stats["serveblob"]++
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sbsMu.Unlock()
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return sbs.blobs.ServeBlob(ctx, w, r, dgst)
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}
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func (sbs statsBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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sbsMu.Lock()
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sbs.stats["stat"]++
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sbsMu.Unlock()
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return sbs.blobs.Stat(ctx, dgst)
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}
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func (sbs statsBlobStore) Delete(ctx context.Context, dgst digest.Digest) error {
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sbsMu.Lock()
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sbs.stats["delete"]++
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sbsMu.Unlock()
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return sbs.blobs.Delete(ctx, dgst)
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}
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type testEnv struct {
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inRemote []distribution.Descriptor
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store proxyBlobStore
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ctx context.Context
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numUnique int
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inRemote []distribution.Descriptor
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store proxyBlobStore
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ctx context.Context
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}
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func (te testEnv) LocalStats() *map[string]int {
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func (te *testEnv) LocalStats() *map[string]int {
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sbsMu.Lock()
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ls := te.store.localStore.(statsBlobStore).stats
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sbsMu.Unlock()
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return &ls
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}
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func (te testEnv) RemoteStats() *map[string]int {
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func (te *testEnv) RemoteStats() *map[string]int {
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sbsMu.Lock()
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rs := te.store.remoteStore.(statsBlobStore).stats
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sbsMu.Unlock()
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return &rs
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}
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// Populate remote store and record the digests
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func makeTestEnv(t *testing.T, name string) testEnv {
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func makeTestEnv(t *testing.T, name string) *testEnv {
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ctx := context.Background()
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localRegistry, err := storage.NewRegistry(ctx, inmemory.New(), storage.BlobDescriptorCacheProvider(memory.NewInMemoryBlobDescriptorCacheProvider()), storage.EnableRedirect, storage.DisableDigestResumption)
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truthDir, err := ioutil.TempDir("", "truth")
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if err != nil {
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t.Fatalf("unable to create tempdir: %s", err)
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}
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cacheDir, err := ioutil.TempDir("", "cache")
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if err != nil {
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t.Fatalf("unable to create tempdir: %s", err)
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}
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// todo: create a tempfile area here
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localRegistry, err := storage.NewRegistry(ctx, filesystem.New(truthDir), storage.BlobDescriptorCacheProvider(memory.NewInMemoryBlobDescriptorCacheProvider()), storage.EnableRedirect, storage.DisableDigestResumption)
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if err != nil {
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t.Fatalf("error creating registry: %v", err)
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}
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@ -89,7 +136,7 @@ func makeTestEnv(t *testing.T, name string) testEnv {
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t.Fatalf("unexpected error getting repo: %v", err)
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}
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truthRegistry, err := storage.NewRegistry(ctx, inmemory.New(), storage.BlobDescriptorCacheProvider(memory.NewInMemoryBlobDescriptorCacheProvider()))
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truthRegistry, err := storage.NewRegistry(ctx, filesystem.New(cacheDir), storage.BlobDescriptorCacheProvider(memory.NewInMemoryBlobDescriptorCacheProvider()))
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if err != nil {
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t.Fatalf("error creating registry: %v", err)
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}
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@ -116,33 +163,59 @@ func makeTestEnv(t *testing.T, name string) testEnv {
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scheduler: s,
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}
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te := testEnv{
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te := &testEnv{
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store: proxyBlobStore,
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ctx: ctx,
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}
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return te
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}
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func populate(t *testing.T, te *testEnv, blobCount int) {
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var inRemote []distribution.Descriptor
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for i := 0; i < blobCount; i++ {
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bytes := []byte(fmt.Sprintf("blob%d", i))
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func makeBlob(size int) []byte {
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blob := make([]byte, size, size)
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for i := 0; i < size; i++ {
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blob[i] = byte('A' + rand.Int()%48)
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}
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return blob
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}
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desc, err := te.store.remoteStore.Put(te.ctx, "", bytes)
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if err != nil {
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t.Errorf("Put in store")
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func init() {
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rand.Seed(42)
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}
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func perm(m []distribution.Descriptor) []distribution.Descriptor {
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for i := 0; i < len(m); i++ {
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j := rand.Intn(i + 1)
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tmp := m[i]
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m[i] = m[j]
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m[j] = tmp
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}
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return m
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}
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func populate(t *testing.T, te *testEnv, blobCount, size, numUnique int) {
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var inRemote []distribution.Descriptor
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for i := 0; i < numUnique; i++ {
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bytes := makeBlob(size)
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for j := 0; j < blobCount/numUnique; j++ {
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desc, err := te.store.remoteStore.Put(te.ctx, "", bytes)
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if err != nil {
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t.Fatalf("Put in store")
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}
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inRemote = append(inRemote, desc)
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}
|
||||
inRemote = append(inRemote, desc)
|
||||
}
|
||||
|
||||
te.inRemote = inRemote
|
||||
|
||||
te.numUnique = numUnique
|
||||
}
|
||||
|
||||
func TestProxyStoreStat(t *testing.T) {
|
||||
te := makeTestEnv(t, "foo/bar")
|
||||
|
||||
remoteBlobCount := 1
|
||||
populate(t, &te, remoteBlobCount)
|
||||
populate(t, te, remoteBlobCount, 10, 1)
|
||||
|
||||
localStats := te.LocalStats()
|
||||
remoteStats := te.RemoteStats()
|
||||
|
|
@ -164,43 +237,91 @@ func TestProxyStoreStat(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
func TestProxyStoreServe(t *testing.T) {
|
||||
func TestProxyStoreServeHighConcurrency(t *testing.T) {
|
||||
te := makeTestEnv(t, "foo/bar")
|
||||
remoteBlobCount := 1
|
||||
populate(t, &te, remoteBlobCount)
|
||||
blobSize := 200
|
||||
blobCount := 10
|
||||
numUnique := 1
|
||||
populate(t, te, blobCount, blobSize, numUnique)
|
||||
|
||||
numClients := 16
|
||||
testProxyStoreServe(t, te, numClients)
|
||||
}
|
||||
|
||||
func TestProxyStoreServeMany(t *testing.T) {
|
||||
te := makeTestEnv(t, "foo/bar")
|
||||
blobSize := 200
|
||||
blobCount := 10
|
||||
numUnique := 4
|
||||
populate(t, te, blobCount, blobSize, numUnique)
|
||||
|
||||
numClients := 4
|
||||
testProxyStoreServe(t, te, numClients)
|
||||
}
|
||||
|
||||
// todo(richardscothern): blobCount must be smaller than num clients
|
||||
func TestProxyStoreServeBig(t *testing.T) {
|
||||
te := makeTestEnv(t, "foo/bar")
|
||||
|
||||
blobSize := 2 << 20
|
||||
blobCount := 4
|
||||
numUnique := 2
|
||||
populate(t, te, blobCount, blobSize, numUnique)
|
||||
|
||||
numClients := 4
|
||||
testProxyStoreServe(t, te, numClients)
|
||||
}
|
||||
|
||||
// testProxyStoreServe will create clients to consume all blobs
|
||||
// populated in the truth store
|
||||
func testProxyStoreServe(t *testing.T, te *testEnv, numClients int) {
|
||||
localStats := te.LocalStats()
|
||||
remoteStats := te.RemoteStats()
|
||||
|
||||
// Serveblob - pulls through blobs
|
||||
for _, dr := range te.inRemote {
|
||||
w := httptest.NewRecorder()
|
||||
r, err := http.NewRequest("GET", "", nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
var wg sync.WaitGroup
|
||||
|
||||
err = te.store.ServeBlob(te.ctx, w, r, dr.Digest)
|
||||
if err != nil {
|
||||
t.Fatalf(err.Error())
|
||||
}
|
||||
for i := 0; i < numClients; i++ {
|
||||
// Serveblob - pulls through blobs
|
||||
wg.Add(1)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
for _, remoteBlob := range te.inRemote {
|
||||
w := httptest.NewRecorder()
|
||||
r, err := http.NewRequest("GET", "", nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
dl, err := digest.FromBytes(w.Body.Bytes())
|
||||
if err != nil {
|
||||
t.Fatalf("Error making digest from blob")
|
||||
}
|
||||
if dl != dr.Digest {
|
||||
t.Errorf("Mismatching blob fetch from proxy")
|
||||
}
|
||||
err = te.store.ServeBlob(te.ctx, w, r, remoteBlob.Digest)
|
||||
if err != nil {
|
||||
t.Fatalf(err.Error())
|
||||
}
|
||||
|
||||
bodyBytes := w.Body.Bytes()
|
||||
localDigest, err := digest.FromBytes(bodyBytes)
|
||||
if err != nil {
|
||||
t.Fatalf("Error making digest from blob")
|
||||
}
|
||||
if localDigest != remoteBlob.Digest {
|
||||
t.Fatalf("Mismatching blob fetch from proxy")
|
||||
}
|
||||
}
|
||||
}()
|
||||
}
|
||||
|
||||
if (*localStats)["stat"] != remoteBlobCount && (*localStats)["create"] != remoteBlobCount {
|
||||
t.Fatalf("unexpected local stats")
|
||||
}
|
||||
if (*remoteStats)["stat"] != remoteBlobCount && (*remoteStats)["open"] != remoteBlobCount {
|
||||
t.Fatalf("unexpected local stats")
|
||||
wg.Wait()
|
||||
|
||||
remoteBlobCount := len(te.inRemote)
|
||||
if (*localStats)["stat"] != remoteBlobCount*numClients && (*localStats)["create"] != te.numUnique {
|
||||
t.Fatal("Expected: stat:", remoteBlobCount*numClients, "create:", remoteBlobCount)
|
||||
}
|
||||
|
||||
// Wait for any async storage goroutines to finish
|
||||
time.Sleep(3 * time.Second)
|
||||
|
||||
remoteStatCount := (*remoteStats)["stat"]
|
||||
remoteOpenCount := (*remoteStats)["open"]
|
||||
|
||||
// Serveblob - blobs come from local
|
||||
for _, dr := range te.inRemote {
|
||||
w := httptest.NewRecorder()
|
||||
|
|
@ -223,15 +344,11 @@ func TestProxyStoreServe(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
// Stat to find local, but no new blobs were created
|
||||
if (*localStats)["stat"] != remoteBlobCount*2 && (*localStats)["create"] != remoteBlobCount*2 {
|
||||
t.Fatalf("unexpected local stats")
|
||||
}
|
||||
localStats = te.LocalStats()
|
||||
remoteStats = te.RemoteStats()
|
||||
|
||||
// Remote unchanged
|
||||
if (*remoteStats)["stat"] != remoteBlobCount && (*remoteStats)["open"] != remoteBlobCount {
|
||||
fmt.Printf("\tlocal=%#v, \n\tremote=%#v\n", localStats, remoteStats)
|
||||
t.Fatalf("unexpected local stats")
|
||||
// Ensure remote unchanged
|
||||
if (*remoteStats)["stat"] != remoteStatCount && (*remoteStats)["open"] != remoteOpenCount {
|
||||
t.Fatalf("unexpected remote stats: %#v", remoteStats)
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -94,7 +94,7 @@ func (pr *proxyingRegistry) Repository(ctx context.Context, name string) (distri
|
|||
}
|
||||
|
||||
return &proxiedRepository{
|
||||
blobStore: proxyBlobStore{
|
||||
blobStore: &proxyBlobStore{
|
||||
localStore: localRepo.Blobs(ctx),
|
||||
remoteStore: remoteRepo.Blobs(ctx),
|
||||
scheduler: pr.scheduler,
|
||||
|
|
|
|||
Loading…
Reference in a new issue