| package images |
| |
| import ( |
| "context" |
| "sync" |
| |
| "github.com/containerd/containerd/content" |
| c8derrdefs "github.com/containerd/containerd/errdefs" |
| "github.com/containerd/containerd/leases" |
| "github.com/containerd/containerd/log" |
| "github.com/containerd/containerd/namespaces" |
| "github.com/docker/docker/distribution" |
| "github.com/docker/docker/image" |
| "github.com/docker/docker/layer" |
| digest "github.com/opencontainers/go-digest" |
| "github.com/pkg/errors" |
| "github.com/sirupsen/logrus" |
| ) |
| |
| func imageKey(dgst digest.Digest) string { |
| return "moby-image-" + dgst.String() |
| } |
| |
| // imageStoreWithLease wraps the configured image store with one that deletes the lease |
| // reigstered for a given image ID, if one exists |
| // |
| // This is used by the main image service to wrap delete calls to the real image store. |
| type imageStoreWithLease struct { |
| image.Store |
| leases leases.Manager |
| |
| // Normally we'd pass namespace down through a context.Context, however... |
| // The interface for image store doesn't allow this, so we store it here. |
| ns string |
| } |
| |
| func (s *imageStoreWithLease) Delete(id image.ID) ([]layer.Metadata, error) { |
| ctx := namespaces.WithNamespace(context.TODO(), s.ns) |
| if err := s.leases.Delete(ctx, leases.Lease{ID: imageKey(digest.Digest(id))}); err != nil && !c8derrdefs.IsNotFound(err) { |
| return nil, errors.Wrap(err, "error deleting lease") |
| } |
| return s.Store.Delete(id) |
| } |
| |
| // iamgeStoreForPull is created for each pull It wraps an underlying image store |
| // to handle registering leases for content fetched in a single image pull. |
| type imageStoreForPull struct { |
| distribution.ImageConfigStore |
| leases leases.Manager |
| ingested *contentStoreForPull |
| } |
| |
| func (s *imageStoreForPull) Put(ctx context.Context, config []byte) (digest.Digest, error) { |
| id, err := s.ImageConfigStore.Put(ctx, config) |
| if err != nil { |
| return "", err |
| } |
| return id, s.updateLease(ctx, id) |
| } |
| |
| func (s *imageStoreForPull) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) { |
| id, err := s.ImageConfigStore.Get(ctx, dgst) |
| if err != nil { |
| return nil, err |
| } |
| return id, s.updateLease(ctx, dgst) |
| } |
| |
| func (s *imageStoreForPull) updateLease(ctx context.Context, dgst digest.Digest) error { |
| leaseID := imageKey(dgst) |
| lease, err := s.leases.Create(ctx, leases.WithID(leaseID)) |
| if err != nil { |
| if !c8derrdefs.IsAlreadyExists(err) { |
| return errors.Wrap(err, "error creating lease") |
| } |
| lease = leases.Lease{ID: leaseID} |
| } |
| |
| digested := s.ingested.getDigested() |
| resource := leases.Resource{ |
| Type: "content", |
| } |
| for _, dgst := range digested { |
| log.G(ctx).WithFields(logrus.Fields{ |
| "digest": dgst, |
| "lease": lease.ID, |
| }).Debug("Adding content digest to lease") |
| |
| resource.ID = dgst.String() |
| if err := s.leases.AddResource(ctx, lease, resource); err != nil { |
| return errors.Wrapf(err, "error adding content digest to lease: %s", dgst) |
| } |
| } |
| return nil |
| } |
| |
| // contentStoreForPull is used to wrap the configured content store to |
| // add lease management for a single `pull` |
| // It stores all committed digests so that `imageStoreForPull` can add |
| // the digsted resources to the lease for an image. |
| type contentStoreForPull struct { |
| distribution.ContentStore |
| leases leases.Manager |
| |
| mu sync.Mutex |
| digested []digest.Digest |
| } |
| |
| func (c *contentStoreForPull) addDigested(dgst digest.Digest) { |
| c.mu.Lock() |
| c.digested = append(c.digested, dgst) |
| c.mu.Unlock() |
| } |
| |
| func (c *contentStoreForPull) getDigested() []digest.Digest { |
| c.mu.Lock() |
| digested := make([]digest.Digest, len(c.digested)) |
| copy(digested, c.digested) |
| c.mu.Unlock() |
| return digested |
| } |
| |
| func (c *contentStoreForPull) Writer(ctx context.Context, opts ...content.WriterOpt) (content.Writer, error) { |
| w, err := c.ContentStore.Writer(ctx, opts...) |
| if err != nil { |
| if c8derrdefs.IsAlreadyExists(err) { |
| var cfg content.WriterOpts |
| for _, o := range opts { |
| if err := o(&cfg); err != nil { |
| return nil, err |
| } |
| |
| } |
| c.addDigested(cfg.Desc.Digest) |
| } |
| return nil, err |
| } |
| return &contentWriter{ |
| cs: c, |
| Writer: w, |
| }, nil |
| } |
| |
| type contentWriter struct { |
| cs *contentStoreForPull |
| content.Writer |
| } |
| |
| func (w *contentWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error { |
| err := w.Writer.Commit(ctx, size, expected, opts...) |
| if err == nil || c8derrdefs.IsAlreadyExists(err) { |
| w.cs.addDigested(expected) |
| } |
| return err |
| } |