seaweedfs/weed/filesys/dirty_pages_stream.go

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package filesys
import (
"fmt"
"github.com/chrislusf/seaweedfs/weed/filesys/page_writer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"io"
"sync"
"time"
)
type StreamDirtyPages struct {
f *File
writeWaitGroup sync.WaitGroup
pageAddLock sync.Mutex
chunkAddLock sync.Mutex
lastErr error
collection string
replication string
chunkedStream *page_writer.ChunkedStreamWriter
}
func newStreamDirtyPages(file *File, chunkSize int64) *StreamDirtyPages {
dirtyPages := &StreamDirtyPages{
f: file,
chunkedStream: page_writer.NewChunkedStreamWriter(chunkSize),
}
dirtyPages.chunkedStream.SetSaveToStorageFunction(dirtyPages.saveChunkedFileIntevalToStorage)
return dirtyPages
}
func (pages *StreamDirtyPages) AddPage(offset int64, data []byte) {
pages.pageAddLock.Lock()
defer pages.pageAddLock.Unlock()
glog.V(4).Infof("%v stream AddPage [%d, %d)", pages.f.fullpath(), offset, offset+int64(len(data)))
if _, err := pages.chunkedStream.WriteAt(data, offset); err != nil {
pages.lastErr = err
}
return
}
func (pages *StreamDirtyPages) FlushData() error {
pages.saveChunkedFileToStorage()
pages.writeWaitGroup.Wait()
if pages.lastErr != nil {
return fmt.Errorf("flush data: %v", pages.lastErr)
}
pages.chunkedStream.Reset()
return nil
}
func (pages *StreamDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
return pages.chunkedStream.ReadDataAt(data, startOffset)
}
func (pages *StreamDirtyPages) GetStorageOptions() (collection, replication string) {
return pages.collection, pages.replication
}
func (pages *StreamDirtyPages) saveChunkedFileToStorage() {
pages.chunkedStream.FlushAll()
}
func (pages *StreamDirtyPages) saveChunkedFileIntevalToStorage(reader io.Reader, offset int64, size int64, cleanupFn func()) {
mtime := time.Now().UnixNano()
pages.writeWaitGroup.Add(1)
writer := func() {
defer pages.writeWaitGroup.Done()
defer cleanupFn()
chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath())(reader, pages.f.Name, offset)
if err != nil {
glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
pages.lastErr = err
return
}
chunk.Mtime = mtime
pages.collection, pages.replication = collection, replication
pages.chunkAddLock.Lock()
pages.f.addChunks([]*filer_pb.FileChunk{chunk})
glog.V(3).Infof("%s saveToStorage %s [%d,%d)", pages.f.fullpath(), chunk.FileId, offset, offset+size)
pages.chunkAddLock.Unlock()
}
if pages.f.wfs.concurrentWriters != nil {
pages.f.wfs.concurrentWriters.Execute(writer)
} else {
go writer()
}
}
func (pages StreamDirtyPages) Destroy() {
pages.chunkedStream.Reset()
}