mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-14 10:39:24 +08:00
114 lines
3.4 KiB
Go
114 lines
3.4 KiB
Go
package mount
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import (
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"context"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"io"
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)
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func (fh *FileHandle) lockForRead(startOffset int64, size int) {
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fh.dirtyPages.LockForRead(startOffset, startOffset+int64(size))
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}
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func (fh *FileHandle) unlockForRead(startOffset int64, size int) {
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fh.dirtyPages.UnlockForRead(startOffset, startOffset+int64(size))
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}
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func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) {
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maxStop = fh.dirtyPages.ReadDirtyDataAt(buff, startOffset)
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return
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}
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func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
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fileFullPath := fh.FullPath()
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entry := fh.entry
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if entry == nil {
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return 0, io.EOF
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}
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if entry.IsInRemoteOnly() {
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glog.V(4).Infof("download remote entry %s", fileFullPath)
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newEntry, err := fh.downloadRemoteEntry(entry)
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if err != nil {
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glog.V(1).Infof("download remote entry %s: %v", fileFullPath, err)
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return 0, err
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}
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entry = newEntry
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}
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fileSize := int64(filer.FileSize(entry))
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if fileSize == 0 {
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glog.V(1).Infof("empty fh %v", fileFullPath)
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return 0, io.EOF
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}
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if offset+int64(len(buff)) <= int64(len(entry.Content)) {
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totalRead := copy(buff, entry.Content[offset:])
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glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fileFullPath, offset, offset+int64(totalRead), totalRead)
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return int64(totalRead), nil
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}
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var chunkResolveErr error
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if fh.entryViewCache == nil {
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fh.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.wfs.LookupFn(), entry.Chunks, 0, fileSize)
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if chunkResolveErr != nil {
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return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
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}
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fh.reader = nil
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}
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reader := fh.reader
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if reader == nil {
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chunkViews := filer.ViewFromVisibleIntervals(fh.entryViewCache, 0, fileSize)
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glog.V(4).Infof("file handle read %s [%d,%d) from %d views", fileFullPath, offset, offset+int64(len(buff)), len(chunkViews))
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for _, chunkView := range chunkViews {
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glog.V(4).Infof(" read %s [%d,%d) from chunk %+v", fileFullPath, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.FileId)
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}
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reader = filer.NewChunkReaderAtFromClient(fh.wfs.LookupFn(), chunkViews, fh.wfs.chunkCache, fileSize)
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}
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fh.reader = reader
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totalRead, err := reader.ReadAt(buff, offset)
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if err != nil && err != io.EOF {
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glog.Errorf("file handle read %s: %v", fileFullPath, err)
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}
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// glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fileFullPath, offset, offset+int64(totalRead), totalRead, err)
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return int64(totalRead), err
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}
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func (fh *FileHandle) downloadRemoteEntry(entry *filer_pb.Entry) (*filer_pb.Entry, error) {
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fileFullPath := fh.FullPath()
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dir, _ := fileFullPath.DirAndName()
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err := fh.wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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request := &filer_pb.CacheRemoteObjectToLocalClusterRequest{
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Directory: string(dir),
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Name: entry.Name,
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}
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glog.V(4).Infof("download entry: %v", request)
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resp, err := client.CacheRemoteObjectToLocalCluster(context.Background(), request)
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if err != nil {
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return fmt.Errorf("CacheRemoteObjectToLocalCluster file %s: %v", fileFullPath, err)
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}
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entry = resp.Entry
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fh.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, resp.Entry))
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return nil
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})
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return entry, err
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}
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