package storage import ( "github.com/docker/distribution/digest" "github.com/docker/distribution/manifest" "github.com/docker/distribution/storagedriver" ) // Services provides various services with application-level operations for // use across backend storage drivers. type Services struct { driver storagedriver.StorageDriver pathMapper *pathMapper layerUploadStore layerUploadStore } // NewServices creates a new Services object to access docker objects stored // in the underlying driver. func NewServices(driver storagedriver.StorageDriver) *Services { layerUploadStore, err := newTemporaryLocalFSLayerUploadStore() if err != nil { // TODO(stevvooe): This failure needs to be understood in the context // of the lifecycle of the services object, which is uncertain at this // point. panic("unable to allocate layerUploadStore: " + err.Error()) } return &Services{ driver: driver, pathMapper: &pathMapper{ // TODO(sday): This should be configurable. root: "/docker/registry/", version: storagePathVersion, }, layerUploadStore: layerUploadStore, } } // Layers returns an instance of the LayerService. Instantiation is cheap and // may be context sensitive in the future. The instance should be used similar // to a request local. func (ss *Services) Layers() LayerService { return &layerStore{driver: ss.driver, pathMapper: ss.pathMapper, uploadStore: ss.layerUploadStore} } // Manifests returns an instance of ManifestService. Instantiation is cheap and // may be context sensitive in the future. The instance should be used similar // to a request local. func (ss *Services) Manifests() ManifestService { return &manifestStore{driver: ss.driver, pathMapper: ss.pathMapper, layerService: ss.Layers()} } // ManifestService provides operations on image manifests. type ManifestService interface { // Tags lists the tags under the named repository. Tags(name string) ([]string, error) // Exists returns true if the layer exists. Exists(name, tag string) (bool, error) // Get retrieves the named manifest, if it exists. Get(name, tag string) (*manifest.SignedManifest, error) // Put creates or updates the named manifest. Put(name, tag string, manifest *manifest.SignedManifest) error // Delete removes the named manifest, if it exists. Delete(name, tag string) error } // LayerService provides operations on layer files in a backend storage. type LayerService interface { // Exists returns true if the layer exists. Exists(name string, digest digest.Digest) (bool, error) // Fetch the layer identifed by TarSum. Fetch(name string, digest digest.Digest) (Layer, error) // Upload begins a layer upload to repository identified by name, // returning a handle. Upload(name string) (LayerUpload, error) // Resume continues an in progress layer upload, returning the current // state of the upload. Resume(uuid string) (LayerUpload, error) }