package storage import ( "bytes" "errors" "fmt" "io" "os" "time" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/storage/backend" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/storage/super_block" . "github.com/chrislusf/seaweedfs/weed/storage/types" ) var ErrorNotFound = errors.New("not found") var ErrorDeleted = errors.New("already deleted") // isFileUnchanged checks whether this needle to write is same as last one. // It requires serialized access in the same volume. func (v *Volume) isFileUnchanged(n *needle.Needle) bool { if v.Ttl.String() != "" { return false } nv, ok := v.nm.Get(n.Id) if ok && !nv.Offset.IsZero() && nv.Size.IsValid() { oldNeedle := new(needle.Needle) err := oldNeedle.ReadData(v.DataBackend, nv.Offset.ToAcutalOffset(), nv.Size, v.Version()) if err != nil { glog.V(0).Infof("Failed to check updated file at offset %d size %d: %v", nv.Offset.ToAcutalOffset(), nv.Size, err) return false } if oldNeedle.Cookie == n.Cookie && oldNeedle.Checksum == n.Checksum && bytes.Equal(oldNeedle.Data, n.Data) { n.DataSize = oldNeedle.DataSize return true } } return false } // Destroy removes everything related to this volume func (v *Volume) Destroy() (err error) { if v.isCompacting { err = fmt.Errorf("volume %d is compacting", v.Id) return } close(v.asyncRequestsChan) storageName, storageKey := v.RemoteStorageNameKey() if v.HasRemoteFile() && storageName != "" && storageKey != "" { if backendStorage, found := backend.BackendStorages[storageName]; found { backendStorage.DeleteFile(storageKey) } } v.Close() os.Remove(v.FileName() + ".dat") os.Remove(v.FileName() + ".idx") os.Remove(v.FileName() + ".vif") os.Remove(v.FileName() + ".sdx") os.Remove(v.FileName() + ".cpd") os.Remove(v.FileName() + ".cpx") os.RemoveAll(v.FileName() + ".ldb") return } func (v *Volume) asyncRequestAppend(request *needle.AsyncRequest) { v.asyncRequestsChan <- request } func (v *Volume) syncWrite(n *needle.Needle) (offset uint64, size Size, isUnchanged bool, err error) { // glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String()) actualSize := needle.GetActualSize(Size(len(n.Data)), v.Version()) v.dataFileAccessLock.Lock() defer v.dataFileAccessLock.Unlock() if MaxPossibleVolumeSize < v.nm.ContentSize()+uint64(actualSize) { err = fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize()) return } if v.isFileUnchanged(n) { size = Size(n.DataSize) isUnchanged = true return } // check whether existing needle cookie matches nv, ok := v.nm.Get(n.Id) if ok { existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.DataBackend, v.Version(), nv.Offset.ToAcutalOffset()) if existingNeedleReadErr != nil { err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr) return } if existingNeedle.Cookie != n.Cookie { glog.V(0).Infof("write cookie mismatch: existing %x, new %x", existingNeedle.Cookie, n.Cookie) err = fmt.Errorf("mismatching cookie %x", n.Cookie) return } } // append to dat file n.AppendAtNs = uint64(time.Now().UnixNano()) if offset, size, _, err = n.Append(v.DataBackend, v.Version()); err != nil { return } v.lastAppendAtNs = n.AppendAtNs // add to needle map if !ok || uint64(nv.Offset.ToAcutalOffset()) < offset { if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil { glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err) } } if v.lastModifiedTsSeconds < n.LastModified { v.lastModifiedTsSeconds = n.LastModified } return } func (v *Volume) writeNeedle2(n *needle.Needle, fsync bool) (offset uint64, size Size, isUnchanged bool, err error) { // glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String()) if n.Ttl == needle.EMPTY_TTL && v.Ttl != needle.EMPTY_TTL { n.SetHasTtl() n.Ttl = v.Ttl } if !fsync { return v.syncWrite(n) } else { asyncRequest := needle.NewAsyncRequest(n, true) // using len(n.Data) here instead of n.Size before n.Size is populated in n.Append() asyncRequest.ActualSize = needle.GetActualSize(Size(len(n.Data)), v.Version()) v.asyncRequestAppend(asyncRequest) offset, _, isUnchanged, err = asyncRequest.WaitComplete() return } } func (v *Volume) doWriteRequest(n *needle.Needle) (offset uint64, size Size, isUnchanged bool, err error) { // glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String()) if v.isFileUnchanged(n) { size = Size(n.DataSize) isUnchanged = true return } // check whether existing needle cookie matches nv, ok := v.nm.Get(n.Id) if ok { existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.DataBackend, v.Version(), nv.Offset.ToAcutalOffset()) if existingNeedleReadErr != nil { err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr) return } if existingNeedle.Cookie != n.Cookie { glog.V(0).Infof("write cookie mismatch: existing %x, new %x", existingNeedle.Cookie, n.Cookie) err = fmt.Errorf("mismatching cookie %x", n.Cookie) return } } // append to dat file n.AppendAtNs = uint64(time.Now().UnixNano()) if offset, size, _, err = n.Append(v.DataBackend, v.Version()); err != nil { return } v.lastAppendAtNs = n.AppendAtNs // add to needle map if !ok || uint64(nv.Offset.ToAcutalOffset()) < offset { if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil { glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err) } } if v.lastModifiedTsSeconds < n.LastModified { v.lastModifiedTsSeconds = n.LastModified } return } func (v *Volume) syncDelete(n *needle.Needle) (Size, error) { glog.V(4).Infof("delete needle %s", needle.NewFileIdFromNeedle(v.Id, n).String()) actualSize := needle.GetActualSize(0, v.Version()) v.dataFileAccessLock.Lock() defer v.dataFileAccessLock.Unlock() if MaxPossibleVolumeSize < v.nm.ContentSize()+uint64(actualSize) { err := fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize()) return 0, err } nv, ok := v.nm.Get(n.Id) // fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size) if ok && nv.Size.IsValid() { size := nv.Size n.Data = nil n.AppendAtNs = uint64(time.Now().UnixNano()) offset, _, _, err := n.Append(v.DataBackend, v.Version()) if err != nil { return size, err } v.lastAppendAtNs = n.AppendAtNs if err = v.nm.Delete(n.Id, ToOffset(int64(offset))); err != nil { return size, err } return size, err } return 0, nil } func (v *Volume) deleteNeedle2(n *needle.Needle) (Size, error) { // todo: delete info is always appended no fsync, it may need fsync in future fsync := false if !fsync { return v.syncDelete(n) } else { asyncRequest := needle.NewAsyncRequest(n, false) asyncRequest.ActualSize = needle.GetActualSize(0, v.Version()) v.asyncRequestAppend(asyncRequest) _, size, _, err := asyncRequest.WaitComplete() return Size(size), err } } func (v *Volume) doDeleteRequest(n *needle.Needle) (Size, error) { glog.V(4).Infof("delete needle %s", needle.NewFileIdFromNeedle(v.Id, n).String()) nv, ok := v.nm.Get(n.Id) // fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size) if ok && nv.Size.IsValid() { size := nv.Size n.Data = nil n.AppendAtNs = uint64(time.Now().UnixNano()) offset, _, _, err := n.Append(v.DataBackend, v.Version()) if err != nil { return size, err } v.lastAppendAtNs = n.AppendAtNs if err = v.nm.Delete(n.Id, ToOffset(int64(offset))); err != nil { return size, err } return size, err } return 0, nil } // read fills in Needle content by looking up n.Id from NeedleMapper func (v *Volume) readNeedle(n *needle.Needle, readOption *ReadOption) (int, error) { v.dataFileAccessLock.RLock() defer v.dataFileAccessLock.RUnlock() nv, ok := v.nm.Get(n.Id) if !ok || nv.Offset.IsZero() { return -1, ErrorNotFound } readSize := nv.Size if readSize.IsDeleted() { if readOption != nil && readOption.ReadDeleted && readSize != TombstoneFileSize { glog.V(3).Infof("reading deleted %s", n.String()) readSize = -readSize } else { return -1, ErrorDeleted } } if readSize == 0 { return 0, nil } err := n.ReadData(v.DataBackend, nv.Offset.ToAcutalOffset(), readSize, v.Version()) if err != nil { return 0, err } bytesRead := len(n.Data) if !n.HasTtl() { return bytesRead, nil } ttlMinutes := n.Ttl.Minutes() if ttlMinutes == 0 { return bytesRead, nil } if !n.HasLastModifiedDate() { return bytesRead, nil } if uint64(time.Now().Unix()) < n.LastModified+uint64(ttlMinutes*60) { return bytesRead, nil } return -1, ErrorNotFound } func (v *Volume) startWorker() { go func() { chanClosed := false for { // chan closed. go thread will exit if chanClosed { break } currentRequests := make([]*needle.AsyncRequest, 0, 128) currentBytesToWrite := int64(0) for { request, ok := <-v.asyncRequestsChan // volume may be closed if !ok { chanClosed = true break } if MaxPossibleVolumeSize < v.ContentSize()+uint64(currentBytesToWrite+request.ActualSize) { request.Complete(0, 0, false, fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.ContentSize())) break } currentRequests = append(currentRequests, request) currentBytesToWrite += request.ActualSize // submit at most 4M bytes or 128 requests at one time to decrease request delay. // it also need to break if there is no data in channel to avoid io hang. if currentBytesToWrite >= 4*1024*1024 || len(currentRequests) >= 128 || len(v.asyncRequestsChan) == 0 { break } } if len(currentRequests) == 0 { continue } v.dataFileAccessLock.Lock() end, _, e := v.DataBackend.GetStat() if e != nil { for i := 0; i < len(currentRequests); i++ { currentRequests[i].Complete(0, 0, false, fmt.Errorf("cannot read current volume position: %v", e)) } v.dataFileAccessLock.Unlock() continue } for i := 0; i < len(currentRequests); i++ { if currentRequests[i].IsWriteRequest { offset, size, isUnchanged, err := v.doWriteRequest(currentRequests[i].N) currentRequests[i].UpdateResult(offset, uint64(size), isUnchanged, err) } else { size, err := v.doDeleteRequest(currentRequests[i].N) currentRequests[i].UpdateResult(0, uint64(size), false, err) } } // if sync error, data is not reliable, we should mark the completed request as fail and rollback if err := v.DataBackend.Sync(); err != nil { // todo: this may generate dirty data or cause data inconsistent, may be weed need to panic? if te := v.DataBackend.Truncate(end); te != nil { glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", v.DataBackend.Name(), end, te) } for i := 0; i < len(currentRequests); i++ { if currentRequests[i].IsSucceed() { currentRequests[i].UpdateResult(0, 0, false, err) } } } for i := 0; i < len(currentRequests); i++ { currentRequests[i].Submit() } v.dataFileAccessLock.Unlock() } }() } type VolumeFileScanner interface { VisitSuperBlock(super_block.SuperBlock) error ReadNeedleBody() bool VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error } func ScanVolumeFile(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType, volumeFileScanner VolumeFileScanner) (err error) { var v *Volume if v, err = loadVolumeWithoutIndex(dirname, collection, id, needleMapKind); err != nil { return fmt.Errorf("failed to load volume %d: %v", id, err) } if err = volumeFileScanner.VisitSuperBlock(v.SuperBlock); err != nil { return fmt.Errorf("failed to process volume %d super block: %v", id, err) } defer v.Close() version := v.Version() offset := int64(v.SuperBlock.BlockSize()) return ScanVolumeFileFrom(version, v.DataBackend, offset, volumeFileScanner) } func ScanVolumeFileFrom(version needle.Version, datBackend backend.BackendStorageFile, offset int64, volumeFileScanner VolumeFileScanner) (err error) { n, nh, rest, e := needle.ReadNeedleHeader(datBackend, version, offset) if e != nil { if e == io.EOF { return nil } return fmt.Errorf("cannot read %s at offset %d: %v", datBackend.Name(), offset, e) } for n != nil { var needleBody []byte if volumeFileScanner.ReadNeedleBody() { // println("needle", n.Id.String(), "offset", offset, "size", n.Size, "rest", rest) if needleBody, err = n.ReadNeedleBody(datBackend, version, offset+NeedleHeaderSize, rest); err != nil { glog.V(0).Infof("cannot read needle head [%d, %d) body [%d, %d) body length %d: %v", offset, offset+NeedleHeaderSize, offset+NeedleHeaderSize, offset+NeedleHeaderSize+rest, rest, err) // err = fmt.Errorf("cannot read needle body: %v", err) // return } } err := volumeFileScanner.VisitNeedle(n, offset, nh, needleBody) if err == io.EOF { return nil } if err != nil { glog.V(0).Infof("visit needle error: %v", err) return fmt.Errorf("visit needle error: %v", err) } offset += NeedleHeaderSize + rest glog.V(4).Infof("==> new entry offset %d", offset) if n, nh, rest, err = needle.ReadNeedleHeader(datBackend, version, offset); err != nil { if err == io.EOF { return nil } return fmt.Errorf("cannot read needle header at offset %d: %v", offset, err) } glog.V(4).Infof("new entry needle size:%d rest:%d", n.Size, rest) } return nil }