github.com/slspeek/camlistore_namedsearch@v0.0.0-20140519202248-ed6f70f7721a/pkg/blobserver/mongo/stat.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 "fmt" 21 22 "camlistore.org/pkg/blob" 23 "camlistore.org/pkg/syncutil" 24 25 "camlistore.org/third_party/labix.org/v2/mgo/bson" 26 ) 27 28 var statGate = syncutil.NewGate(50) // arbitrary 29 30 func (m *mongoStorage) StatBlobs(dest chan<- blob.SizedRef, blobs []blob.Ref) error { 31 var wg syncutil.Group 32 33 for _, b := range blobs { 34 b := b 35 statGate.Start() 36 wg.Go(func() error { 37 defer statGate.Done() 38 var doc blobDoc 39 if err := m.c.Find(bson.M{"key": b.String()}).Select(bson.M{"size": 1}).One(&doc); err != nil { 40 return fmt.Errorf("error statting %v: %v", b, err) 41 } 42 dest <- blob.SizedRef{Ref: b, Size: doc.Size} 43 return nil 44 }) 45 } 46 return wg.Err() 47 }