package page_writer import ( "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/util" "github.com/chrislusf/seaweedfs/weed/util/mem" "os" ) var ( _ = PageChunk(&SwapFileChunk{}) ) type ActualChunkIndex int type SwapFile struct { dir string file *os.File logicToActualChunkIndex map[LogicChunkIndex]ActualChunkIndex chunkSize int64 } type SwapFileChunk struct { swapfile *SwapFile usage *ChunkWrittenIntervalList logicChunkIndex LogicChunkIndex actualChunkIndex ActualChunkIndex } func NewSwapFile(dir string, chunkSize int64) *SwapFile { return &SwapFile{ dir: dir, file: nil, logicToActualChunkIndex: make(map[LogicChunkIndex]ActualChunkIndex), chunkSize: chunkSize, } } func (sf *SwapFile) FreeResource() { if sf.file != nil { sf.file.Close() os.Remove(sf.file.Name()) } } func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapFileChunk) { if sf.file == nil { var err error sf.file, err = os.CreateTemp(sf.dir, "") if err != nil { glog.Errorf("create swap file: %v", err) return nil } } actualChunkIndex, found := sf.logicToActualChunkIndex[logicChunkIndex] if !found { actualChunkIndex = ActualChunkIndex(len(sf.logicToActualChunkIndex)) sf.logicToActualChunkIndex[logicChunkIndex] = actualChunkIndex } return &SwapFileChunk{ swapfile: sf, usage: newChunkWrittenIntervalList(), logicChunkIndex: logicChunkIndex, actualChunkIndex: actualChunkIndex, } } func (sc *SwapFileChunk) FreeResource() { } func (sc *SwapFileChunk) WriteDataAt(src []byte, offset int64) (n int) { innerOffset := offset % sc.swapfile.chunkSize var err error n, err = sc.swapfile.file.WriteAt(src, int64(sc.actualChunkIndex)*sc.swapfile.chunkSize+innerOffset) if err == nil { sc.usage.MarkWritten(innerOffset, innerOffset+int64(n)) } else { glog.Errorf("failed to write swap file %s: %v", sc.swapfile.file.Name(), err) } return } func (sc *SwapFileChunk) ReadDataAt(p []byte, off int64) (maxStop int64) { chunkStartOffset := int64(sc.logicChunkIndex) * sc.swapfile.chunkSize for t := sc.usage.head.next; t != sc.usage.tail; t = t.next { logicStart := max(off, chunkStartOffset+t.StartOffset) logicStop := min(off+int64(len(p)), chunkStartOffset+t.stopOffset) if logicStart < logicStop { actualStart := logicStart - chunkStartOffset + int64(sc.actualChunkIndex)*sc.swapfile.chunkSize if _, err := sc.swapfile.file.ReadAt(p[logicStart-off:logicStop-off], actualStart); err != nil { glog.Errorf("failed to reading swap file %s: %v", sc.swapfile.file.Name(), err) break } maxStop = max(maxStop, logicStop) } } return } func (sc *SwapFileChunk) IsComplete() bool { return sc.usage.IsComplete(sc.swapfile.chunkSize) } func (sc *SwapFileChunk) SaveContent(saveFn SaveToStorageFunc) { if saveFn == nil { return } for t := sc.usage.head.next; t != sc.usage.tail; t = t.next { data := mem.Allocate(int(t.Size())) sc.swapfile.file.ReadAt(data, t.StartOffset+int64(sc.actualChunkIndex)*sc.swapfile.chunkSize) reader := util.NewBytesReader(data) saveFn(reader, int64(sc.logicChunkIndex)*sc.swapfile.chunkSize+t.StartOffset, t.Size(), func() { }) mem.Free(data) } sc.usage = newChunkWrittenIntervalList() }