mirror of https://github.com/perkeep/perkeep.git
138 lines
3.7 KiB
Go
138 lines
3.7 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package localdisk
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import (
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"fmt"
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"io"
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"os"
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"regexp"
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"camlistore.org/pkg/blobref"
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"camlistore.org/pkg/blobserver"
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"camlistore.org/pkg/jsonconfig"
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)
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type DiskStorage struct {
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*blobserver.SimpleBlobHubPartitionMap
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root string
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// the sub-partition (queue) to write to / read from, or "" for none.
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partition string
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// queue partitions to mirror new blobs into (when partition
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// above is the empty string)
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mirrorPartitions []*DiskStorage
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}
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// New returns a new local disk storage implementation, rooted at the provided
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// directory, which must already exist.
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func New(root string) (*DiskStorage, error) {
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// Local disk.
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fi, err := os.Stat(root)
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("Storage root %q doesn't exist", root)
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}
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if err != nil {
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return nil, fmt.Errorf("Failed to stat directory %q: %v", root, err)
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}
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if !fi.IsDir() {
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return nil, fmt.Errorf("Storage root %q exists but is not a directory.", root)
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}
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ds := &DiskStorage{
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SimpleBlobHubPartitionMap: &blobserver.SimpleBlobHubPartitionMap{},
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root: root,
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}
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if _, _, err := ds.StorageGeneration(); err != nil {
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return nil, fmt.Errorf("Error initialization generation for %q: %v", root, err)
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}
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return ds, nil
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}
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func newFromConfig(_ blobserver.Loader, config jsonconfig.Obj) (storage blobserver.Storage, err error) {
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path := config.RequiredString("path")
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if err := config.Validate(); err != nil {
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return nil, err
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}
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return New(path)
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}
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func init() {
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blobserver.RegisterStorageConstructor("filesystem", blobserver.StorageConstructor(newFromConfig))
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}
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var validQueueName = regexp.MustCompile(`^[a-zA-Z0-9\-\_]+$`)
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func (ds *DiskStorage) CreateQueue(name string) (blobserver.Storage, error) {
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if !validQueueName.MatchString(name) {
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return nil, fmt.Errorf("invalid queue name %q", name)
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}
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if ds.partition != "" {
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return nil, fmt.Errorf("can't create queue %q on existing queue %q",
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name, ds.partition)
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}
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q := &DiskStorage{
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SimpleBlobHubPartitionMap: &blobserver.SimpleBlobHubPartitionMap{},
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root: ds.root,
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partition: "queue-" + name,
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}
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baseDir := ds.PartitionRoot(q.partition)
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if err := os.MkdirAll(baseDir, 0700); err != nil {
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return nil, fmt.Errorf("failed to create queue base dir: %v", err)
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}
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ds.mirrorPartitions = append(ds.mirrorPartitions, q)
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return q, nil
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}
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func (ds *DiskStorage) FetchStreaming(blob *blobref.BlobRef) (io.ReadCloser, int64, error) {
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return ds.Fetch(blob)
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}
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func (ds *DiskStorage) Fetch(blob *blobref.BlobRef) (blobref.ReadSeekCloser, int64, error) {
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fileName := ds.blobPath("", blob)
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stat, err := os.Stat(fileName)
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if os.IsNotExist(err) {
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return nil, 0, os.ErrNotExist
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}
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file, err := os.Open(fileName)
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if err != nil {
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if os.IsNotExist(err) {
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err = os.ErrNotExist
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}
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return nil, 0, err
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}
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return file, stat.Size(), nil
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}
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func (ds *DiskStorage) RemoveBlobs(blobs []*blobref.BlobRef) error {
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for _, blob := range blobs {
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fileName := ds.blobPath(ds.partition, blob)
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err := os.Remove(fileName)
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switch {
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case err == nil:
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continue
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case os.IsNotExist(err):
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// deleting already-deleted file; harmless.
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continue
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default:
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return err
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}
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}
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return nil
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}
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