github.com/slspeek/camlistore_namedsearch@v0.0.0-20140519202248-ed6f70f7721a/pkg/blobserver/mongo/receive.go (about) 1 /* 2 Copyright 2014 The Camlistore Authors 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 mongo 18 19 import ( 20 "io" 21 "io/ioutil" 22 23 "camlistore.org/pkg/blob" 24 25 "camlistore.org/third_party/labix.org/v2/mgo" 26 ) 27 28 const ( 29 // This error code is returned by mongo when a unique key violation occurs when inserting 30 // See: http://www.mongodb.org/about/contributors/error-codes/ 31 mgoUniqueKeyErr = 11000 32 ) 33 34 func (m *mongoStorage) ReceiveBlob(ref blob.Ref, source io.Reader) (blob.SizedRef, error) { 35 blobData, err := ioutil.ReadAll(source) 36 if err != nil { 37 return blob.SizedRef{}, err 38 } 39 40 b := blobDoc{Key: ref.String(), Blob: blobData, Size: uint32(len(blobData))} 41 42 if err = m.c.Insert(b); err != nil { 43 // Unique key violation? 44 // Then the blob already exists, no need to throw an error 45 if mongoErr, isMongoErr := err.(*mgo.LastError); isMongoErr && mongoErr.Code == mgoUniqueKeyErr { 46 return blob.SizedRef{Ref: ref, Size: b.Size}, nil 47 } 48 return blob.SizedRef{}, err 49 } 50 return blob.SizedRef{Ref: ref, Size: b.Size}, nil 51 }