containerd

type Reference interface {
	// Name is the name of the artifact.
	Name() string

	// Digest is the digest of the artifact.
	Digest() digest.Digest

	// Tag is the tag of the artifact.
	Tag() string

	// Repository is the repository of the artifact.
	Repository() string

	// Host is the host of the artifact.
	Host() string

	// String returns the string representation of the reference.
	// docker.io/library/ubuntu:latest
	// docker.io/library/ubuntu@sha256:abcdef
	String() string
}

type Store interface {
	// Subscribe returns a channel of artifacts and a channel of errors.
	// Artifacts are sent on the channel as they are discovered.
	Subscribe(ctx context.Context) (<-chan Reference, <-chan error)

	// List returns a list of artifacts.
	List(ctx context.Context) ([]Reference, error)

	// Resolve returns the digest for an existing artifact.
	Resolve(ctx context.Context, ref string) (digest.Digest, error)

	// Size returns the size of the artifact.
	Size(ctx context.Context, dgst digest.Digest) (int64, error)

	// Bytes returns the artifact bytes.
	Bytes(ctx context.Context, dgst digest.Digest) ([]byte, string, error)

	// Write writes the artifact bytes to the writer.
	Write(ctx context.Context, dst io.Writer, dgst digest.Digest) error

	// Verify will verify that the client status is healthy.
	Verify(ctx context.Context) error

	// All returns a list of digests of all resources referenced in ref.
	All(ctx context.Context, ref Reference) ([]string, error)
}