96 lines
2.3 KiB
Go
96 lines
2.3 KiB
Go
// Copyright 2019 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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// Filesystem storage backend for Nixery.
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package storage
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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log "github.com/sirupsen/logrus"
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)
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type FSBackend struct {
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path string
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}
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func NewFSBackend() (*FSBackend, error) {
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p := os.Getenv("STORAGE_PATH")
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if p == "" {
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return nil, fmt.Errorf("STORAGE_PATH must be set for filesystem storage")
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}
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p = path.Clean(p)
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err := os.MkdirAll(p, 0755)
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if err != nil {
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return nil, fmt.Errorf("failed to create storage dir: %s", err)
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}
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return &FSBackend{p}, nil
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}
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func (b *FSBackend) Name() string {
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return fmt.Sprintf("Filesystem (%s)", b.path)
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}
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func (b *FSBackend) Persist(ctx context.Context, key string, f Persister) (string, int64, error) {
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full := path.Join(b.path, key)
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dir := path.Dir(full)
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err := os.MkdirAll(dir, 0755)
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if err != nil {
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log.WithError(err).WithField("path", dir).Error("failed to create storage directory")
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return "", 0, err
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}
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file, err := os.OpenFile(full, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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log.WithError(err).WithField("file", full).Error("failed to write file")
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return "", 0, err
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}
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defer file.Close()
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return f(file)
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}
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func (b *FSBackend) Fetch(ctx context.Context, key string) (io.ReadCloser, error) {
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full := path.Join(b.path, key)
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return os.Open(full)
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}
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func (b *FSBackend) Move(ctx context.Context, old, new string) error {
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newpath := path.Join(b.path, new)
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err := os.MkdirAll(path.Dir(newpath), 0755)
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if err != nil {
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return err
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}
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return os.Rename(path.Join(b.path, old), newpath)
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}
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func (b *FSBackend) ServeLayer(digest string, r *http.Request, w http.ResponseWriter) error {
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p := path.Join(b.path, "layers", digest)
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log.WithFields(log.Fields{
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"layer": digest,
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"path": p,
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}).Info("serving layer from filesystem")
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http.ServeFile(w, r, p)
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return nil
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}
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