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129 lines
3.8 KiB
129 lines
3.8 KiB
package page_writer
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import (
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/util/mem"
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"os"
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)
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var (
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_ = PageChunk(&SwapFileChunk{})
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)
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type ActualChunkIndex int
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type SwapFile struct {
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dir string
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file *os.File
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logicToActualChunkIndex map[LogicChunkIndex]ActualChunkIndex
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chunkSize int64
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freeActualChunkList []ActualChunkIndex
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}
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type SwapFileChunk struct {
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swapfile *SwapFile
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usage *ChunkWrittenIntervalList
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logicChunkIndex LogicChunkIndex
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actualChunkIndex ActualChunkIndex
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}
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func NewSwapFile(dir string, chunkSize int64) *SwapFile {
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return &SwapFile{
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dir: dir,
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file: nil,
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logicToActualChunkIndex: make(map[LogicChunkIndex]ActualChunkIndex),
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chunkSize: chunkSize,
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}
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}
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func (sf *SwapFile) FreeResource() {
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if sf.file != nil {
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sf.file.Close()
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os.Remove(sf.file.Name())
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}
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}
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func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapFileChunk) {
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if sf.file == nil {
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var err error
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sf.file, err = os.CreateTemp(sf.dir, "")
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if err != nil {
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glog.Errorf("create swap file: %v", err)
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return nil
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}
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}
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actualChunkIndex, found := sf.logicToActualChunkIndex[logicChunkIndex]
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if !found {
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if len(sf.freeActualChunkList) > 0 {
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actualChunkIndex = sf.freeActualChunkList[0]
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sf.freeActualChunkList = sf.freeActualChunkList[1:]
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} else {
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actualChunkIndex = ActualChunkIndex(len(sf.logicToActualChunkIndex))
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}
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sf.logicToActualChunkIndex[logicChunkIndex] = actualChunkIndex
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}
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return &SwapFileChunk{
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swapfile: sf,
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usage: newChunkWrittenIntervalList(),
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logicChunkIndex: logicChunkIndex,
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actualChunkIndex: actualChunkIndex,
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}
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}
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func (sc *SwapFileChunk) FreeResource() {
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sc.swapfile.freeActualChunkList = append(sc.swapfile.freeActualChunkList, sc.actualChunkIndex)
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delete(sc.swapfile.logicToActualChunkIndex, sc.logicChunkIndex)
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}
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func (sc *SwapFileChunk) WriteDataAt(src []byte, offset int64) (n int) {
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innerOffset := offset % sc.swapfile.chunkSize
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var err error
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n, err = sc.swapfile.file.WriteAt(src, int64(sc.actualChunkIndex)*sc.swapfile.chunkSize+innerOffset)
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if err == nil {
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sc.usage.MarkWritten(innerOffset, innerOffset+int64(n))
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} else {
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glog.Errorf("failed to write swap file %s: %v", sc.swapfile.file.Name(), err)
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}
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return
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}
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func (sc *SwapFileChunk) ReadDataAt(p []byte, off int64) (maxStop int64) {
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chunkStartOffset := int64(sc.logicChunkIndex) * sc.swapfile.chunkSize
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for t := sc.usage.head.next; t != sc.usage.tail; t = t.next {
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logicStart := max(off, chunkStartOffset+t.StartOffset)
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logicStop := min(off+int64(len(p)), chunkStartOffset+t.stopOffset)
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if logicStart < logicStop {
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actualStart := logicStart - chunkStartOffset + int64(sc.actualChunkIndex)*sc.swapfile.chunkSize
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if _, err := sc.swapfile.file.ReadAt(p[logicStart-off:logicStop-off], actualStart); err != nil {
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glog.Errorf("failed to reading swap file %s: %v", sc.swapfile.file.Name(), err)
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break
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}
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maxStop = max(maxStop, logicStop)
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}
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}
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return
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}
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func (sc *SwapFileChunk) IsComplete() bool {
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return sc.usage.IsComplete(sc.swapfile.chunkSize)
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}
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func (sc *SwapFileChunk) WrittenSize() int64 {
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return sc.usage.WrittenSize()
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}
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func (sc *SwapFileChunk) SaveContent(saveFn SaveToStorageFunc) {
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if saveFn == nil {
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return
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}
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for t := sc.usage.head.next; t != sc.usage.tail; t = t.next {
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data := mem.Allocate(int(t.Size()))
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sc.swapfile.file.ReadAt(data, t.StartOffset+int64(sc.actualChunkIndex)*sc.swapfile.chunkSize)
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reader := util.NewBytesReader(data)
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saveFn(reader, int64(sc.logicChunkIndex)*sc.swapfile.chunkSize+t.StartOffset, t.Size(), func() {
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})
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mem.Free(data)
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}
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sc.usage = newChunkWrittenIntervalList()
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}
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