github.com/slspeek/camlistore_namedsearch@v0.0.0-20140519202248-ed6f70f7721a/pkg/blobserver/localdisk/receive.go (about) 1 /* 2 Copyright 2011 Google Inc. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package localdisk 18 19 import ( 20 "errors" 21 "fmt" 22 "io" 23 "io/ioutil" 24 "log" 25 "os" 26 27 "camlistore.org/pkg/blob" 28 ) 29 30 func (ds *DiskStorage) ReceiveBlob(blobRef blob.Ref, source io.Reader) (ref blob.SizedRef, err error) { 31 ds.dirLockMu.RLock() 32 defer ds.dirLockMu.RUnlock() 33 34 hashedDirectory := ds.blobDirectory(blobRef) 35 err = os.MkdirAll(hashedDirectory, 0700) 36 if err != nil { 37 return 38 } 39 40 tempFile, err := ioutil.TempFile(hashedDirectory, blobFileBaseName(blobRef)+".tmp") 41 if err != nil { 42 return 43 } 44 45 success := false // set true later 46 defer func() { 47 if !success { 48 log.Println("Removing temp file: ", tempFile.Name()) 49 os.Remove(tempFile.Name()) 50 } 51 }() 52 53 written, err := io.Copy(tempFile, source) 54 if err != nil { 55 return 56 } 57 if err = tempFile.Sync(); err != nil { 58 return 59 } 60 if err = tempFile.Close(); err != nil { 61 return 62 } 63 stat, err := os.Lstat(tempFile.Name()) 64 if err != nil { 65 return 66 } 67 if stat.Size() != written { 68 err = fmt.Errorf("temp file %q size %d didn't match written size %d", tempFile.Name(), stat.Size(), written) 69 return 70 } 71 72 fileName := ds.blobPath(blobRef) 73 if err = os.Rename(tempFile.Name(), fileName); err != nil { 74 if err = mapRenameError(err, tempFile.Name(), fileName); err != nil { 75 return 76 } 77 } 78 79 stat, err = os.Lstat(fileName) 80 if err != nil { 81 return 82 } 83 if stat.Size() != written { 84 err = errors.New("Written size didn't match.") 85 return 86 } 87 88 success = true // used in defer above 89 return blob.SizedRef{Ref: blobRef, Size: uint32(stat.Size())}, nil 90 }