package mount import ( "context" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "io" ) func (fh *FileHandle) lockForRead(startOffset int64, size int) { fh.dirtyPages.LockForRead(startOffset, startOffset+int64(size)) } func (fh *FileHandle) unlockForRead(startOffset int64, size int) { fh.dirtyPages.UnlockForRead(startOffset, startOffset+int64(size)) } func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) { maxStop = fh.dirtyPages.ReadDirtyDataAt(buff, startOffset) return } func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) { fileFullPath := fh.FullPath() entry := fh.entry if entry == nil { return 0, io.EOF } if entry.IsInRemoteOnly() { glog.V(4).Infof("download remote entry %s", fileFullPath) newEntry, err := fh.downloadRemoteEntry(entry) if err != nil { glog.V(1).Infof("download remote entry %s: %v", fileFullPath, err) return 0, err } entry = newEntry } fileSize := int64(filer.FileSize(entry)) if fileSize == 0 { glog.V(1).Infof("empty fh %v", fileFullPath) return 0, io.EOF } if offset+int64(len(buff)) <= int64(len(entry.Content)) { totalRead := copy(buff, entry.Content[offset:]) glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fileFullPath, offset, offset+int64(totalRead), totalRead) return int64(totalRead), nil } var chunkResolveErr error if fh.entryViewCache == nil { fh.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.wfs.LookupFn(), entry.Chunks, 0, fileSize) if chunkResolveErr != nil { return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr) } fh.reader = nil } reader := fh.reader if reader == nil { chunkViews := filer.ViewFromVisibleIntervals(fh.entryViewCache, 0, fileSize) glog.V(4).Infof("file handle read %s [%d,%d) from %d views", fileFullPath, offset, offset+int64(len(buff)), len(chunkViews)) for _, chunkView := range chunkViews { glog.V(4).Infof(" read %s [%d,%d) from chunk %+v", fileFullPath, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.FileId) } reader = filer.NewChunkReaderAtFromClient(fh.wfs.LookupFn(), chunkViews, fh.wfs.chunkCache, fileSize) } fh.reader = reader totalRead, err := reader.ReadAt(buff, offset) if err != nil && err != io.EOF { glog.Errorf("file handle read %s: %v", fileFullPath, err) } // glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fileFullPath, offset, offset+int64(totalRead), totalRead, err) return int64(totalRead), err } func (fh *FileHandle) downloadRemoteEntry(entry *filer_pb.Entry) (*filer_pb.Entry, error) { fileFullPath := fh.FullPath() dir, _ := fileFullPath.DirAndName() err := fh.wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { request := &filer_pb.CacheRemoteObjectToLocalClusterRequest{ Directory: string(dir), Name: entry.Name, } glog.V(4).Infof("download entry: %v", request) resp, err := client.CacheRemoteObjectToLocalCluster(context.Background(), request) if err != nil { return fmt.Errorf("CacheRemoteObjectToLocalCluster file %s: %v", fileFullPath, err) } entry = resp.Entry fh.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, resp.Entry)) return nil }) return entry, err }