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package filesys
import (
"bazil.org/fuse"
"bazil.org/fuse/fs"
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"net/http"
"strings"
"sync"
)
type FileHandle struct {
// cache file has been written to
dirtyPages *ContinuousDirtyPages
contentType string
dirtyMetadata bool
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
}
func newFileHandle(file *File, uid, gid uint32) *FileHandle {
return &FileHandle{
f: file,
dirtyPages: newDirtyPages(file),
Uid: uid,
Gid: gid,
}
}
func (fh *FileHandle) InitializeToFile(file *File, uid, gid uint32) *FileHandle {
newHandle := &FileHandle{
f: file,
dirtyPages: fh.dirtyPages.InitializeToFile(file),
Uid: uid,
Gid: gid,
}
return newHandle
}
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(4).Infof("%s read fh %d: [%d,%d)", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size))
// this value should come from the filer instead of the old f
if len(fh.f.entry.Chunks) == 0 {
glog.V(1).Infof("empty fh %v/%v", fh.f.dir.Path, fh.f.Name)
return nil
}
buff := make([]byte, req.Size)
chunkViews := filer2.ViewFromChunks(fh.f.entry.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(4).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(4).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(4).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(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)))
chunks, err := fh.dirtyPages.AddPage(ctx, req.Offset, req.Data)
if err != nil {
glog.Errorf("%+v/%v write fh %d: [%d,%d): %v", fh.f.dir.Path, fh.f.Name, fh.handle, req.Offset, req.Offset+int64(len(req.Data)), err)
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)
}
resp.Size = len(req.Data)
if req.Offset == 0 {
fh.contentType = http.DetectContentType(req.Data)
fh.dirtyMetadata = true
}
for _, chunk := range chunks {
fh.f.entry.Chunks = append(fh.f.entry.Chunks, chunk)
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))
fh.dirtyMetadata = true
}
return nil
}
func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
glog.V(4).Infof("%v release fh %d", fh.f.fullpath(), fh.handle)
fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
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(4).Infof("%s fh %d flush %v", fh.f.fullpath(), fh.handle, req)
chunk, err := fh.dirtyPages.FlushToStorage(ctx)
if err != nil {
glog.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)
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)
}
if chunk != nil {
fh.f.entry.Chunks = append(fh.f.entry.Chunks, chunk)
}
if !fh.dirtyMetadata {
return nil
}
return fh.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
if fh.f.entry.Attributes != nil {
fh.f.entry.Attributes.Mime = fh.contentType
fh.f.entry.Attributes.Uid = req.Uid
fh.f.entry.Attributes.Gid = req.Gid
}
request := &filer_pb.CreateEntryRequest{
Directory: fh.f.dir.Path,
Entry: fh.f.entry,
}
glog.V(1).Infof("%s/%s set chunks: %v", fh.f.dir.Path, fh.f.Name, len(fh.f.entry.Chunks))
for i, chunk := range fh.f.entry.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.CreateEntry(ctx, request); err != nil {
return fmt.Errorf("update fh: %v", err)
}
return nil
})
}
func volumeId(fileId string) string {
lastCommaIndex := strings.LastIndex(fileId, ",")
if lastCommaIndex > 0 {
return fileId[:lastCommaIndex]
}
return fileId
}
|
