mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-09-08 10:00:37 +02:00
234 lines
6.4 KiB
Go
234 lines
6.4 KiB
Go
package filesys
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import (
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"bazil.org/fuse"
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"bazil.org/fuse/fs"
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"context"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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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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"github.com/chrislusf/seaweedfs/weed/util"
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"strings"
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"sync"
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"net/http"
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)
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type FileHandle struct {
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// cache file has been written to
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dirtyPages *ContinuousDirtyPages
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dirtyMetadata bool
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handle uint64
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f *File
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RequestId fuse.RequestID // unique ID for request
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NodeId fuse.NodeID // file or directory the request is about
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Uid uint32 // user ID of process making request
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Gid uint32 // group ID of process making request
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}
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func newFileHandle(file *File, uid, gid uint32) *FileHandle {
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return &FileHandle{
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f: file,
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dirtyPages: newDirtyPages(file),
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Uid: uid,
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Gid: gid,
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}
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}
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var _ = fs.Handle(&FileHandle{})
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// var _ = fs.HandleReadAller(&FileHandle{})
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var _ = fs.HandleReader(&FileHandle{})
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var _ = fs.HandleFlusher(&FileHandle{})
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var _ = fs.HandleWriter(&FileHandle{})
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var _ = fs.HandleReleaser(&FileHandle{})
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func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
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glog.V(4).Infof("%s read fh %d: [%d,%d)", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size))
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// this value should come from the filer instead of the old f
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if len(fh.f.Chunks) == 0 {
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glog.V(0).Infof("empty fh %v/%v", fh.f.dir.Path, fh.f.Name)
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return fmt.Errorf("empty file %v/%v", fh.f.dir.Path, fh.f.Name)
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}
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buff := make([]byte, req.Size)
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chunkViews := filer2.ViewFromChunks(fh.f.Chunks, req.Offset, req.Size)
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var vids []string
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for _, chunkView := range chunkViews {
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vids = append(vids, volumeId(chunkView.FileId))
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}
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vid2Locations := make(map[string]*filer_pb.Locations)
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err := fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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glog.V(4).Infof("read fh lookup volume id locations: %v", vids)
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resp, err := client.LookupVolume(ctx, &filer_pb.LookupVolumeRequest{
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VolumeIds: vids,
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})
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if err != nil {
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return err
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}
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vid2Locations = resp.LocationsMap
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return nil
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})
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if err != nil {
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glog.V(4).Infof("%v/%v read fh lookup volume ids: %v", fh.f.dir.Path, fh.f.Name, err)
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return fmt.Errorf("failed to lookup volume ids %v: %v", vids, err)
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}
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var totalRead int64
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var wg sync.WaitGroup
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for _, chunkView := range chunkViews {
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wg.Add(1)
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go func(chunkView *filer2.ChunkView) {
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defer wg.Done()
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glog.V(4).Infof("read fh reading chunk: %+v", chunkView)
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locations := vid2Locations[volumeId(chunkView.FileId)]
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if locations == nil || len(locations.Locations) == 0 {
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glog.V(0).Infof("failed to locate %s", chunkView.FileId)
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err = fmt.Errorf("failed to locate %s", chunkView.FileId)
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return
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}
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var n int64
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n, err = util.ReadUrl(
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fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, chunkView.FileId),
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chunkView.Offset,
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int(chunkView.Size),
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buff[chunkView.LogicOffset-req.Offset:chunkView.LogicOffset-req.Offset+int64(chunkView.Size)])
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if err != nil {
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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)
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err = fmt.Errorf("failed to read http://%s/%s: %v",
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locations.Locations[0].Url, chunkView.FileId, err)
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return
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}
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glog.V(4).Infof("read fh read %d bytes: %+v", n, chunkView)
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totalRead += n
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}(chunkView)
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}
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wg.Wait()
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resp.Data = buff[:totalRead]
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return err
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}
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// Write to the file handle
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func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
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// write the request to volume servers
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glog.V(4).Infof("%+v/%v write fh %d: [%d,%d)", fh.f.dir.Path, fh.f.Name, fh.handle, req.Offset, req.Offset+int64(len(req.Data)))
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chunks, err := fh.dirtyPages.AddPage(ctx, req.Offset, req.Data)
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if err != nil {
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return fmt.Errorf("write %s/%s at [%d,%d): %v", fh.f.dir.Path, fh.f.Name, req.Offset, req.Offset+int64(len(req.Data)), err)
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}
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resp.Size = len(req.Data)
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if req.Offset == 0 {
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fh.f.attributes.Mime = http.DetectContentType(req.Data)
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fh.dirtyMetadata = true
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}
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for _, chunk := range chunks {
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fh.f.Chunks = append(fh.f.Chunks, chunk)
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glog.V(1).Infof("uploaded %s/%s to %s [%d,%d)", fh.f.dir.Path, fh.f.Name, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size))
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fh.dirtyMetadata = true
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}
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return nil
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}
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func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
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glog.V(4).Infof("%v release fh %d", fh.f.fullpath(), fh.handle)
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fh.f.wfs.ReleaseHandle(fuse.HandleID(fh.handle))
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fh.f.isOpen = false
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return nil
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}
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// Flush - experimenting with uploading at flush, this slows operations down till it has been
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// completely flushed
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func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
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// fflush works at fh level
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// send the data to the OS
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glog.V(4).Infof("%s fh %d flush %v", fh.f.fullpath(), fh.handle, req)
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chunk, err := fh.dirtyPages.FlushToStorage(ctx)
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if err != nil {
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glog.V(0).Infof("flush %s/%s to %s [%d,%d): %v", fh.f.dir.Path, fh.f.Name, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size), err)
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return fmt.Errorf("flush %s/%s to %s [%d,%d): %v", fh.f.dir.Path, fh.f.Name, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size), err)
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}
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if chunk != nil {
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fh.f.Chunks = append(fh.f.Chunks, chunk)
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fh.dirtyMetadata = true
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}
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if !fh.dirtyMetadata {
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return nil
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}
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if len(fh.f.Chunks) == 0 {
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glog.V(2).Infof("fh %s/%s flush skipping empty: %v", fh.f.dir.Path, fh.f.Name, req)
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return nil
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}
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err = fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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request := &filer_pb.UpdateEntryRequest{
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Directory: fh.f.dir.Path,
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Entry: &filer_pb.Entry{
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Name: fh.f.Name,
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Attributes: fh.f.attributes,
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Chunks: fh.f.Chunks,
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},
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}
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glog.V(1).Infof("%s/%s set chunks: %v", fh.f.dir.Path, fh.f.Name, len(fh.f.Chunks))
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for i, chunk := range fh.f.Chunks {
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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))
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}
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if _, err := client.UpdateEntry(ctx, request); err != nil {
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return fmt.Errorf("update fh: %v", err)
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}
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return nil
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})
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if err == nil {
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fh.dirtyMetadata = false
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}
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return err
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}
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func volumeId(fileId string) string {
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lastCommaIndex := strings.LastIndex(fileId, ",")
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if lastCommaIndex > 0 {
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return fileId[:lastCommaIndex]
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}
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return fileId
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}
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