mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
package mount
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
|
|
"github.com/seaweedfs/seaweedfs/weed/filer"
|
|
"github.com/seaweedfs/seaweedfs/weed/glog"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
|
|
)
|
|
|
|
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.GetChunks(), 0, fileSize)
|
|
if chunkResolveErr != nil {
|
|
return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
|
|
}
|
|
fh.CloseReader()
|
|
}
|
|
|
|
if fh.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)
|
|
}
|
|
fh.reader = filer.NewChunkReaderAtFromClient(fh.wfs.LookupFn(), chunkViews, fh.wfs.chunkCache, fileSize)
|
|
}
|
|
|
|
totalRead, err := fh.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
|
|
}
|