mirror of https://github.com/perkeep/perkeep.git
110 lines
2.4 KiB
Go
110 lines
2.4 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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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"camlistore.org/pkg/blob"
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)
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func (ds *DiskStorage) startGate() {
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if ds.tmpFileGate == nil {
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return
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}
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ds.tmpFileGate.Start()
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}
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func (ds *DiskStorage) doneGate() {
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if ds.tmpFileGate == nil {
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return
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}
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ds.tmpFileGate.Done()
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}
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func (ds *DiskStorage) ReceiveBlob(blobRef blob.Ref, source io.Reader) (ref blob.SizedRef, err error) {
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ds.dirLockMu.RLock()
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defer ds.dirLockMu.RUnlock()
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hashedDirectory := ds.blobDirectory(blobRef)
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err = os.MkdirAll(hashedDirectory, 0700)
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if err != nil {
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return
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}
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// TODO(mpl): warn when we hit the gate, and at a limited rate, like maximum once a minute.
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// Deferring to another CL, since it requires modifications to syncutil.Gate first.
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ds.startGate()
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tempFile, err := ioutil.TempFile(hashedDirectory, blobFileBaseName(blobRef)+".tmp")
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if err != nil {
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ds.doneGate()
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return
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}
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success := false // set true later
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defer func() {
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if !success {
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log.Println("Removing temp file: ", tempFile.Name())
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os.Remove(tempFile.Name())
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}
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ds.doneGate()
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}()
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written, err := io.Copy(tempFile, source)
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if err != nil {
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return
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}
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if err = tempFile.Sync(); err != nil {
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return
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}
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if err = tempFile.Close(); err != nil {
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return
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}
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stat, err := os.Lstat(tempFile.Name())
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if err != nil {
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return
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}
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if stat.Size() != written {
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err = fmt.Errorf("temp file %q size %d didn't match written size %d", tempFile.Name(), stat.Size(), written)
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return
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}
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fileName := ds.blobPath(blobRef)
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if err = os.Rename(tempFile.Name(), fileName); err != nil {
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if err = mapRenameError(err, tempFile.Name(), fileName); err != nil {
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return
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}
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}
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stat, err = os.Lstat(fileName)
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if err != nil {
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return
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}
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if stat.Size() != written {
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err = errors.New("Written size didn't match.")
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return
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}
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success = true // used in defer above
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return blob.SizedRef{Ref: blobRef, Size: uint32(stat.Size())}, nil
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}
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