forked from TrueCloudLab/distribution
d9d84ae269
This changeset integrates context with the storage package. Debug messages have been added to exported methods. Existing log messages will now include contextual details through logger fields to aid in debugging. This integration focuses on logging and may be followed up with a metric-oriented change in the future. Signed-off-by: Stephen J Day <stephen.day@docker.com>
84 lines
3 KiB
Go
84 lines
3 KiB
Go
package storage
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import (
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/manifest"
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"golang.org/x/net/context"
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)
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// TODO(stevvooe): These types need to be moved out of the storage package.
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// Registry represents a collection of repositories, addressable by name.
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type Registry interface {
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// Repository should return a reference to the named repository. The
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// registry may or may not have the repository but should always return a
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// reference.
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Repository(ctx context.Context, name string) Repository
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}
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// Repository is a named collection of manifests and layers.
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type Repository interface {
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// Name returns the name of the repository.
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Name() string
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// Manifests returns a reference to this repository's manifest service.
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Manifests() ManifestService
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// Layers returns a reference to this repository's layers service.
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Layers() LayerService
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}
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// ManifestService provides operations on image manifests.
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type ManifestService interface {
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// Tags lists the tags under the named repository.
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Tags() ([]string, error)
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// Exists returns true if the manifest exists.
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Exists(tag string) (bool, error)
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// Get retrieves the named manifest, if it exists.
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Get(tag string) (*manifest.SignedManifest, error)
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// Put creates or updates the named manifest.
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// Put(tag string, manifest *manifest.SignedManifest) (digest.Digest, error)
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Put(tag string, manifest *manifest.SignedManifest) error
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// Delete removes the named manifest, if it exists.
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Delete(tag string) error
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// TODO(stevvooe): There are several changes that need to be done to this
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// interface:
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//
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// 1. Get(tag string) should be GetByTag(tag string)
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// 2. Put(tag string, manifest *manifest.SignedManifest) should be
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// Put(manifest *manifest.SignedManifest). The method can read the
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// tag on manifest to automatically tag it in the repository.
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// 3. Need a GetByDigest(dgst digest.Digest) method.
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// 4. Allow explicit tagging with Tag(digest digest.Digest, tag string)
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// 5. Support reading tags with a re-entrant reader to avoid large
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// allocations in the registry.
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// 6. Long-term: Provide All() method that lets one scroll through all of
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// the manifest entries.
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// 7. Long-term: break out concept of signing from manifests. This is
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// really a part of the distribution sprint.
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// 8. Long-term: Manifest should be an interface. This code shouldn't
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// really be concerned with the storage format.
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}
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// LayerService provides operations on layer files in a backend storage.
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type LayerService interface {
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// Exists returns true if the layer exists.
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Exists(digest digest.Digest) (bool, error)
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// Fetch the layer identifed by TarSum.
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Fetch(digest digest.Digest) (Layer, error)
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// Upload begins a layer upload to repository identified by name,
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// returning a handle.
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Upload() (LayerUpload, error)
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// Resume continues an in progress layer upload, returning a handle to the
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// upload. The caller should seek to the latest desired upload location
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// before proceeding.
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Resume(uuid string) (LayerUpload, error)
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}
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