0bc84606cc
This allows wrappers of LayerUpload to implement io.ReadFrom, which prevents io.Copy on LayerUpload implementations from using repeated 32kB Writes. This has a huge performance implication, especially for s3/azure storage drivers.
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
package storage
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import (
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"fmt"
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"io"
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"time"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/manifest"
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)
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// Layer provides a readable and seekable layer object. Typically,
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// implementations are *not* goroutine safe.
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type Layer interface {
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// http.ServeContent requires an efficient implementation of
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// ReadSeeker.Seek(0, os.SEEK_END).
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io.ReadSeeker
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io.Closer
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// Name returns the repository under which this layer is linked.
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Name() string // TODO(stevvooe): struggling with nomenclature: should this be "repo" or "name"?
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// Digest returns the unique digest of the blob, which is the tarsum for
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// layers.
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Digest() digest.Digest
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// CreatedAt returns the time this layer was created.
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CreatedAt() time.Time
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}
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// LayerUpload provides a handle for working with in-progress uploads.
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// Instances can be obtained from the LayerService.Upload and
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// LayerService.Resume.
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type LayerUpload interface {
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io.WriteSeeker
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io.ReaderFrom
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io.Closer
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// Name of the repository under which the layer will be linked.
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Name() string
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// UUID returns the identifier for this upload.
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UUID() string
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// StartedAt returns the time this layer upload was started.
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StartedAt() time.Time
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// Finish marks the upload as completed, returning a valid handle to the
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// uploaded layer. The digest is validated against the contents of the
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// uploaded layer.
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Finish(digest digest.Digest) (Layer, error)
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// Cancel the layer upload process.
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Cancel() error
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}
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var (
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// ErrLayerExists returned when layer already exists
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ErrLayerExists = fmt.Errorf("layer exists")
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// ErrLayerTarSumVersionUnsupported when tarsum is unsupported version.
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ErrLayerTarSumVersionUnsupported = fmt.Errorf("unsupported tarsum version")
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// ErrLayerUploadUnknown returned when upload is not found.
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ErrLayerUploadUnknown = fmt.Errorf("layer upload unknown")
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// ErrLayerClosed returned when an operation is attempted on a closed
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// Layer or LayerUpload.
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ErrLayerClosed = fmt.Errorf("layer closed")
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)
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// ErrUnknownLayer returned when layer cannot be found.
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type ErrUnknownLayer struct {
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FSLayer manifest.FSLayer
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}
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func (err ErrUnknownLayer) Error() string {
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return fmt.Sprintf("unknown layer %v", err.FSLayer.BlobSum)
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}
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// ErrLayerInvalidDigest returned when tarsum check fails.
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type ErrLayerInvalidDigest struct {
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Digest digest.Digest
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Reason error
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}
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func (err ErrLayerInvalidDigest) Error() string {
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return fmt.Sprintf("invalid digest for referenced layer: %v, %v",
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err.Digest, err.Reason)
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}
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