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package filesys
import ( "bazil.org/fuse/fs" "fmt" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/filer2" "context" "github.com/chrislusf/seaweedfs/weed/glog" "bazil.org/fuse" "bytes" "github.com/chrislusf/seaweedfs/weed/operation" "time" "strings" "sync" "github.com/chrislusf/seaweedfs/weed/util" )
type FileHandle struct { // cache file has been written to
dirty bool
cachePath string
handle uint64
f *File RequestId fuse.RequestID // unique ID for request
NodeId fuse.NodeID // file or directory the request is about
Uid uint32 // user ID of process making request
Gid uint32 // group ID of process making request
}
var _ = fs.Handle(&FileHandle{}) // var _ = fs.HandleReadAller(&FileHandle{})
var _ = fs.HandleReader(&FileHandle{}) var _ = fs.HandleFlusher(&FileHandle{}) var _ = fs.HandleWriter(&FileHandle{}) var _ = fs.HandleReleaser(&FileHandle{})
func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
glog.V(3).Infof("%v/%v read fh: [%d,%d)", fh.f.dir.Path, fh.f.Name, req.Offset, req.Offset+int64(req.Size))
if len(fh.f.Chunks) == 0 { glog.V(0).Infof("empty fh %v/%v", fh.f.dir.Path, fh.f.Name) return fmt.Errorf("empty file %v/%v", fh.f.dir.Path, fh.f.Name) }
buff := make([]byte, req.Size)
chunkViews := filer2.ReadFromChunks(fh.f.Chunks, req.Offset, req.Size)
var vids []string for _, chunkView := range chunkViews { vids = append(vids, volumeId(chunkView.FileId)) }
vid2Locations := make(map[string]*filer_pb.Locations)
err := fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
glog.V(4).Infof("read fh lookup volume id locations: %v", vids) resp, err := client.LookupVolume(ctx, &filer_pb.LookupVolumeRequest{ VolumeIds: vids, }) if err != nil { return err }
vid2Locations = resp.LocationsMap
return nil })
if err != nil { glog.V(3).Infof("%v/%v read fh lookup volume ids: %v", fh.f.dir.Path, fh.f.Name, err) return fmt.Errorf("failed to lookup volume ids %v: %v", vids, err) }
var totalRead int64 var wg sync.WaitGroup for _, chunkView := range chunkViews { wg.Add(1) go func(chunkView *filer2.ChunkView) { defer wg.Done()
glog.V(3).Infof("read fh reading chunk: %+v", chunkView)
locations := vid2Locations[volumeId(chunkView.FileId)] if locations == nil || len(locations.Locations) == 0 { glog.V(0).Infof("failed to locate %s", chunkView.FileId) err = fmt.Errorf("failed to locate %s", chunkView.FileId) return }
var n int64 n, err = util.ReadUrl( fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, chunkView.FileId), chunkView.Offset, int(chunkView.Size), buff[chunkView.LogicOffset-req.Offset:chunkView.LogicOffset-req.Offset+int64(chunkView.Size)])
if err != nil {
glog.V(0).Infof("%v/%v read http://%s/%v %v bytes: %v", fh.f.dir.Path, fh.f.Name, locations.Locations[0].Url, chunkView.FileId, n, err)
err = fmt.Errorf("failed to read http://%s/%s: %v", locations.Locations[0].Url, chunkView.FileId, err) return }
glog.V(3).Infof("read fh read %d bytes: %+v", n, chunkView) totalRead += n
}(chunkView) } wg.Wait()
resp.Data = buff[:totalRead]
return err }
// Write to the file handle
func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
// write the request to volume servers
glog.V(3).Infof("%+v/%v write fh: %+v", fh.f.dir.Path, fh.f.Name, req)
var fileId, host string
if err := fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.AssignVolumeRequest{ Count: 1, Replication: "000", Collection: "", }
resp, err := client.AssignVolume(ctx, request) if err != nil { glog.V(0).Infof("assign volume failure %v: %v", request, err) return err }
fileId, host = resp.FileId, resp.Url
return nil }); err != nil { return fmt.Errorf("filer assign volume: %v", err) }
fileUrl := fmt.Sprintf("http://%s/%s", host, fileId) bufReader := bytes.NewReader(req.Data) uploadResult, err := operation.Upload(fileUrl, fh.f.Name, bufReader, false, "application/octet-stream", nil, "") if err != nil { glog.V(0).Infof("upload data %v to %s: %v", req, fileUrl, err) return fmt.Errorf("upload data: %v", err) } if uploadResult.Error != "" { glog.V(0).Infof("upload failure %v to %s: %v", req, fileUrl, err) return fmt.Errorf("upload result: %v", uploadResult.Error) }
resp.Size = int(uploadResult.Size)
fh.f.Chunks = append(fh.f.Chunks, &filer_pb.FileChunk{ FileId: fileId, Offset: req.Offset, Size: uint64(uploadResult.Size), Mtime: time.Now().UnixNano(), })
glog.V(1).Infof("uploaded %s/%s to: %v, [%d,%d)", fh.f.dir.Path, fh.f.Name, fileUrl, req.Offset, req.Offset+int64(resp.Size))
fh.dirty = true
return nil }
func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
glog.V(3).Infof("%+v/%v release fh", fh.f.dir.Path, fh.f.Name)
fh.f.isOpen = false
return nil }
// Flush - experimenting with uploading at flush, this slows operations down till it has been
// completely flushed
func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error { // fflush works at fh level
// send the data to the OS
glog.V(3).Infof("%s/%s fh flush %v", fh.f.dir.Path, fh.f.Name, req)
if !fh.dirty { return nil }
if len(fh.f.Chunks) == 0 { glog.V(2).Infof("fh %s/%s flush skipping empty: %v", fh.f.dir.Path, fh.f.Name, req) return nil }
err := fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.UpdateEntryRequest{ Directory: fh.f.dir.Path, Entry: &filer_pb.Entry{ Name: fh.f.Name, Attributes: fh.f.attributes, Chunks: fh.f.Chunks, }, }
glog.V(1).Infof("%s/%s set chunks: %v", fh.f.dir.Path, fh.f.Name, len(fh.f.Chunks)) for i, chunk := range fh.f.Chunks { glog.V(1).Infof("%s/%s chunks %d: %v [%d,%d)", fh.f.dir.Path, fh.f.Name, i, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size)) } if _, err := client.UpdateEntry(ctx, request); err != nil { return fmt.Errorf("update fh: %v", err) }
return nil })
if err == nil { fh.dirty = false }
return err }
func volumeId(fileId string) string { lastCommaIndex := strings.LastIndex(fileId, ",") if lastCommaIndex > 0 { return fileId[:lastCommaIndex] } return fileId }
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