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182 lines
4.3 KiB
182 lines
4.3 KiB
package filesys
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import (
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"bytes"
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"io"
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"sync"
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"time"
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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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)
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type ContinuousDirtyPages struct {
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intervals *ContinuousIntervals
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f *File
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lock sync.Mutex
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collection string
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replication string
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}
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func newDirtyPages(file *File) *ContinuousDirtyPages {
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return &ContinuousDirtyPages{
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intervals: &ContinuousIntervals{},
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f: file,
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}
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}
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func (pages *ContinuousDirtyPages) releaseResource() {
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}
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var counter = int32(0)
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func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) (chunks []*filer_pb.FileChunk, err error) {
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pages.lock.Lock()
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defer pages.lock.Unlock()
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glog.V(4).Infof("%s AddPage [%d,%d) of %d bytes", pages.f.fullpath(), offset, offset+int64(len(data)), pages.f.entry.Attributes.FileSize)
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if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) {
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// this is more than what buffer can hold.
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return pages.flushAndSave(offset, data)
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}
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pages.intervals.AddInterval(data, offset)
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var chunk *filer_pb.FileChunk
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var hasSavedData bool
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if pages.intervals.TotalSize() > pages.f.wfs.option.ChunkSizeLimit {
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chunk, hasSavedData, err = pages.saveExistingLargestPageToStorage()
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if hasSavedData {
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chunks = append(chunks, chunk)
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}
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}
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return
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}
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func (pages *ContinuousDirtyPages) flushAndSave(offset int64, data []byte) (chunks []*filer_pb.FileChunk, err error) {
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var chunk *filer_pb.FileChunk
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var newChunks []*filer_pb.FileChunk
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// flush existing
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if newChunks, err = pages.saveExistingPagesToStorage(); err == nil {
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if newChunks != nil {
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chunks = append(chunks, newChunks...)
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}
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} else {
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return
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}
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// flush the new page
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if chunk, err = pages.saveToStorage(bytes.NewReader(data), offset, int64(len(data))); err == nil {
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if chunk != nil {
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glog.V(4).Infof("%s/%s flush big request [%d,%d) to %s", pages.f.dir.FullPath(), pages.f.Name, chunk.Offset, chunk.Offset+int64(chunk.Size), chunk.FileId)
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chunks = append(chunks, chunk)
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}
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} else {
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glog.V(0).Infof("%s/%s failed to flush2 [%d,%d): %v", pages.f.dir.FullPath(), pages.f.Name, chunk.Offset, chunk.Offset+int64(chunk.Size), err)
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return
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}
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return
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}
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func (pages *ContinuousDirtyPages) FlushToStorage() (chunks []*filer_pb.FileChunk, err error) {
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pages.lock.Lock()
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defer pages.lock.Unlock()
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return pages.saveExistingPagesToStorage()
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}
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func (pages *ContinuousDirtyPages) saveExistingPagesToStorage() (chunks []*filer_pb.FileChunk, err error) {
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var hasSavedData bool
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var chunk *filer_pb.FileChunk
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for {
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chunk, hasSavedData, err = pages.saveExistingLargestPageToStorage()
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if !hasSavedData {
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return chunks, err
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}
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if err == nil {
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chunks = append(chunks, chunk)
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} else {
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return
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}
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}
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}
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func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (chunk *filer_pb.FileChunk, hasSavedData bool, err error) {
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maxList := pages.intervals.RemoveLargestIntervalLinkedList()
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if maxList == nil {
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return nil, false, nil
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}
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fileSize := int64(pages.f.entry.Attributes.FileSize)
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for {
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chunkSize := min(maxList.Size(), fileSize-maxList.Offset())
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chunk, err = pages.saveToStorage(maxList.ToReader(), maxList.Offset(), chunkSize)
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if err == nil {
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hasSavedData = true
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glog.V(4).Infof("%s saveToStorage %s [%d,%d) of %d bytes", pages.f.fullpath(), chunk.FileId, maxList.Offset(), maxList.Offset()+chunkSize, fileSize)
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return
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} else {
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glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), maxList.Offset(), maxList.Offset()+chunkSize, err)
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time.Sleep(5 * time.Second)
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}
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}
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}
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func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) (*filer_pb.FileChunk, error) {
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dir, _ := pages.f.fullpath().DirAndName()
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reader = io.LimitReader(reader, size)
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chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(dir)(reader, pages.f.Name, offset)
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if err != nil {
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return nil, err
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}
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pages.collection, pages.replication = collection, replication
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return chunk, nil
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}
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func maxUint64(x, y uint64) uint64 {
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if x > y {
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return x
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}
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return y
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}
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func max(x, y int64) int64 {
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if x > y {
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return x
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}
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return y
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}
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func min(x, y int64) int64 {
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if x < y {
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return x
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}
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return y
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}
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func (pages *ContinuousDirtyPages) ReadDirtyData(data []byte, startOffset int64) (offset int64, size int) {
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pages.lock.Lock()
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defer pages.lock.Unlock()
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return pages.intervals.ReadData(data, startOffset)
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}
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