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3a89367dba
This is going to be used for general content-addressed objects, and is not layer specific anymore.
52 lines
1.7 KiB
Go
52 lines
1.7 KiB
Go
// Copyright 2019-2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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// Package storage implements an interface that can be implemented by
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// storage backends, such as Google Cloud Storage or the local
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// filesystem.
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package storage
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import (
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"context"
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"io"
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"net/http"
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)
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type Persister = func(io.Writer) (string, int64, error)
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type Backend interface {
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// Name returns the name of the storage backend, for use in
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// log messages and such.
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Name() string
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// Persist provides a user-supplied function with a writer
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// that stores data in the storage backend.
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//
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// It needs to return the SHA256 hash of the data written as
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// well as the total number of bytes, as those are required
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// for the image manifest.
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Persist(context.Context, string, Persister) (string, int64, error)
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// Fetch retrieves data from the storage backend.
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Fetch(ctx context.Context, path string) (io.ReadCloser, error)
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// Move renames a path inside the storage backend. This is
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// used for staging uploads while calculating their hashes.
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Move(ctx context.Context, old, new string) error
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// Serve provides a handler function to serve HTTP requests
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// for objects in the storage backend.
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Serve(digest string, r *http.Request, w http.ResponseWriter) error
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}
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