distribution/storage/layerstore.go

96 lines
2.5 KiB
Go

package storage
import (
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/storagedriver"
)
type layerStore struct {
driver storagedriver.StorageDriver
pathMapper *pathMapper
uploadStore layerUploadStore
}
func (ls *layerStore) Exists(name string, digest digest.Digest) (bool, error) {
// Because this implementation just follows blob links, an existence check
// is pretty cheap by starting and closing a fetch.
_, err := ls.Fetch(name, digest)
if err != nil {
switch err.(type) {
case ErrUnknownLayer:
return false, nil
}
return false, err
}
return true, nil
}
func (ls *layerStore) Fetch(name string, digest digest.Digest) (Layer, error) {
blobPath, err := resolveBlobPath(ls.driver, ls.pathMapper, name, digest)
if err != nil {
switch err := err.(type) {
case storagedriver.PathNotFoundError, *storagedriver.PathNotFoundError:
return nil, ErrUnknownLayer{manifest.FSLayer{BlobSum: digest}}
default:
return nil, err
}
}
fr, err := newFileReader(ls.driver, blobPath)
if err != nil {
switch err := err.(type) {
case storagedriver.PathNotFoundError, *storagedriver.PathNotFoundError:
return nil, ErrUnknownLayer{manifest.FSLayer{BlobSum: digest}}
default:
return nil, err
}
}
return &layerReader{
fileReader: *fr,
name: name,
digest: digest,
}, nil
}
// Upload begins a layer upload, returning a handle. If the layer upload
// is already in progress or the layer has already been uploaded, this
// will return an error.
func (ls *layerStore) Upload(name string) (LayerUpload, error) {
// NOTE(stevvooe): Consider the issues with allowing concurrent upload of
// the same two layers. Should it be disallowed? For now, we allow both
// parties to proceed and the the first one uploads the layer.
lus, err := ls.uploadStore.New(name)
if err != nil {
return nil, err
}
return ls.newLayerUpload(lus), nil
}
// Resume continues an in progress layer upload, returning the current
// state of the upload.
func (ls *layerStore) Resume(lus LayerUploadState) (LayerUpload, error) {
_, err := ls.uploadStore.GetState(lus.UUID)
if err != nil {
return nil, err
}
return ls.newLayerUpload(lus), nil
}
// newLayerUpload allocates a new upload controller with the given state.
func (ls *layerStore) newLayerUpload(lus LayerUploadState) LayerUpload {
return &layerUploadController{
LayerUploadState: lus,
layerStore: ls,
uploadStore: ls.uploadStore,
}
}