package storage import ( "path" "sync" "github.com/docker/distribution/context" "github.com/docker/distribution/digest" ) type signatureStore struct { repository *repository blobStore *blobStore ctx context.Context } func (s *signatureStore) Get(dgst digest.Digest) ([][]byte, error) { signaturesPath, err := pathFor(manifestSignaturesPathSpec{ name: s.repository.Name().Name(), revision: dgst, }) if err != nil { return nil, err } // Need to append signature digest algorithm to path to get all items. // Perhaps, this should be in the pathMapper but it feels awkward. This // can be eliminated by implementing listAll on drivers. signaturesPath = path.Join(signaturesPath, "sha256") signaturePaths, err := s.blobStore.driver.List(s.ctx, signaturesPath) if err != nil { return nil, err } var wg sync.WaitGroup type result struct { index int signature []byte err error } ch := make(chan result) bs := s.linkedBlobStore(s.ctx, dgst) for i, sigPath := range signaturePaths { sigdgst, err := digest.ParseDigest("sha256:" + path.Base(sigPath)) if err != nil { context.GetLogger(s.ctx).Errorf("could not get digest from path: %q, skipping", sigPath) continue } wg.Add(1) go func(idx int, sigdgst digest.Digest) { defer wg.Done() context.GetLogger(s.ctx). Debugf("fetching signature %q", sigdgst) r := result{index: idx} if p, err := bs.Get(s.ctx, sigdgst); err != nil { context.GetLogger(s.ctx). Errorf("error fetching signature %q: %v", sigdgst, err) r.err = err } else { r.signature = p } ch <- r }(i, sigdgst) } done := make(chan struct{}) go func() { wg.Wait() close(done) }() // aggregrate the results signatures := make([][]byte, len(signaturePaths)) loop: for { select { case result := <-ch: signatures[result.index] = result.signature if result.err != nil && err == nil { // only set the first one. err = result.err } case <-done: break loop } } return signatures, err } func (s *signatureStore) Put(dgst digest.Digest, signatures ...[]byte) error { bs := s.linkedBlobStore(s.ctx, dgst) for _, signature := range signatures { if _, err := bs.Put(s.ctx, "application/json", signature); err != nil { return err } } return nil } // linkedBlobStore returns the namedBlobStore of the signatures for the // manifest with the given digest. Effectively, each signature link path // layout is a unique linked blob store. func (s *signatureStore) linkedBlobStore(ctx context.Context, revision digest.Digest) *linkedBlobStore { linkpath := func(name string, dgst digest.Digest) (string, error) { return pathFor(manifestSignatureLinkPathSpec{ name: name, revision: revision, signature: dgst, }) } return &linkedBlobStore{ ctx: ctx, repository: s.repository, blobStore: s.blobStore, blobAccessController: &linkedBlobStatter{ blobStore: s.blobStore, repository: s.repository, linkPathFns: []linkPathFunc{linkpath}, }, linkPathFns: []linkPathFunc{linkpath}, } }