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// Package storage implements an interface that can be implemented by
// storage backends, such as Google Cloud Storage or the local
// filesystem.
package storage
import (
"io"
"net/http"
)
type Backend interface {
// Name returns the name of the storage backend, for use in
// log messages and such.
Name() string
// Persist provides a user-supplied function with a writer
// that stores data in the storage backend.
//
// It needs to return the SHA256 hash of the data written as
// well as the total number of bytes, as those are required
// for the image manifest.
Persist(string, func(io.Writer) (string, int64, error)) (string, int64, error)
// Fetch retrieves data from the storage backend.
Fetch(path string) (io.ReadCloser, error)
// Move renames a path inside the storage backend. This is
// used for staging uploads while calculating their hashes.
Move(old, new string) error
// Serve provides a handler function to serve HTTP requests
// for layers in the storage backend.
ServeLayer(digest string, w http.ResponseWriter) error
}
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