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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| orascontent "github.com/deislabs/oras/pkg/content" | ||
|
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| "github.com/containerd/containerd/content" | ||
| "github.com/containerd/containerd/content/local" | ||
| "github.com/containerd/containerd/errdefs" | ||
| digest "github.com/opencontainers/go-digest" | ||
| ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| type cachedStore struct { | ||
| base content.Ingester | ||
| cache content.Store | ||
| } | ||
|
|
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| // newStoreWithCache creates a store with a consistent cache layer. | ||
| func newStoreWithCache(base content.Ingester, cacheRoot string) (orascontent.ProvideIngester, error) { | ||
| cache, err := local.NewStore(cacheRoot) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &cachedStore{ | ||
| base: base, | ||
| cache: cache, | ||
| }, nil | ||
| } | ||
|
|
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| // ReaderAt reads the cache if available, and then check the base store. | ||
| func (s *cachedStore) ReaderAt(ctx context.Context, desc ocispec.Descriptor) (content.ReaderAt, error) { | ||
| return s.cache.ReaderAt(ctx, desc) | ||
| } | ||
|
|
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| // Writer writes to the cache if not exists, and then copy the cache to the base store. | ||
| func (s *cachedStore) Writer(ctx context.Context, opts ...content.WriterOpt) (content.Writer, error) { | ||
| var wOpts content.WriterOpts | ||
| for _, opt := range opts { | ||
| if err := opt(&wOpts); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| switch wOpts.Desc.MediaType { | ||
| case ocispec.MediaTypeImageManifest, ocispec.MediaTypeImageIndex: | ||
| return s.cache.Writer(ctx, opts...) | ||
| } | ||
|
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| cacheWriter, err := s.cache.Writer(ctx, opts...) | ||
| if err != nil { | ||
| if !errdefs.IsAlreadyExists(err) { | ||
| return nil, err | ||
| } | ||
| if err := s.applyCache(ctx, wOpts.Desc, opts...); err != nil { | ||
| return nil, err | ||
| } | ||
| return nil, errdefs.ErrAlreadyExists | ||
| } | ||
|
|
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| return &callbackWriter{ | ||
| Writer: cacheWriter, | ||
| onCommit: func(ctx context.Context) error { | ||
| return s.applyCache(ctx, wOpts.Desc, opts...) | ||
| }, | ||
| }, nil | ||
| } | ||
|
|
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| // applyCache copies the content from cache to the base store | ||
| func (s *cachedStore) applyCache(ctx context.Context, desc ocispec.Descriptor, opts ...content.WriterOpt) error { | ||
| cw, err := s.base.Writer(ctx, opts...) | ||
| if err != nil { | ||
| if errdefs.IsAlreadyExists(err) { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
|
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| ws, err := cw.Status() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if ws.Offset != desc.Size { | ||
| ra, err := s.cache.ReaderAt(ctx, desc) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer ra.Close() | ||
|
|
||
| if err := content.CopyReaderAt(cw, ra, desc.Size); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
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||
| if err := cw.Commit(ctx, desc.Size, desc.Digest); err != nil && !errdefs.IsAlreadyExists(err) { | ||
| return errors.Wrapf(err, "failed commit on ref %q", ws.Ref) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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| type callbackWriter struct { | ||
| content.Writer | ||
| onCommit func(ctx context.Context) error | ||
| } | ||
|
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| func (cw *callbackWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error { | ||
| if err := cw.Writer.Commit(ctx, size, expected, opts...); err != nil { | ||
| return err | ||
| } | ||
| return cw.onCommit(ctx) | ||
| } |
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