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