package filer2 import ( "io" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "github.com/chrislusf/seaweedfs/weed/wdclient" ) func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int) error { chunkViews := ViewFromChunks(chunks, offset, size) fileId2Url := make(map[string]string) for _, chunkView := range chunkViews { urlString, err := masterClient.LookupFileId(chunkView.FileId) if err != nil { glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err) return err } fileId2Url[chunkView.FileId] = urlString } for _, chunkView := range chunkViews { urlString := fileId2Url[chunkView.FileId] _, err := util.ReadUrlAsStream(urlString, chunkView.Offset, int(chunkView.Size), func(data []byte) { w.Write(data) }) if err != nil { glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err) return err } } return nil }