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