mirror of
https://github.com/seaweedfs/seaweedfs.git
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373 lines
10 KiB
Go
373 lines
10 KiB
Go
package filer
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import (
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"bytes"
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"fmt"
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"golang.org/x/exp/slices"
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"io"
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"math"
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"sort"
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"strings"
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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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"github.com/chrislusf/seaweedfs/weed/stats"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/wdclient"
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)
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func HasData(entry *filer_pb.Entry) bool {
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if len(entry.Content) > 0 {
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return true
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}
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return len(entry.Chunks) > 0
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}
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func IsSameData(a, b *filer_pb.Entry) bool {
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if len(a.Content) > 0 || len(b.Content) > 0 {
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return bytes.Equal(a.Content, b.Content)
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}
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return isSameChunks(a.Chunks, b.Chunks)
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}
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func isSameChunks(a, b []*filer_pb.FileChunk) bool {
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if len(a) != len(b) {
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return false
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}
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slices.SortFunc(a, func(i, j *filer_pb.FileChunk) bool {
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return strings.Compare(i.ETag, j.ETag) < 0
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})
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slices.SortFunc(b, func(i, j *filer_pb.FileChunk) bool {
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return strings.Compare(i.ETag, j.ETag) < 0
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})
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for i := 0; i < len(a); i++ {
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if a[i].ETag != b[i].ETag {
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return false
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}
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}
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return true
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}
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func NewFileReader(filerClient filer_pb.FilerClient, entry *filer_pb.Entry) io.Reader {
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if len(entry.Content) > 0 {
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return bytes.NewReader(entry.Content)
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}
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return NewChunkStreamReader(filerClient, entry.Chunks)
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}
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func StreamContent(masterClient wdclient.HasLookupFileIdFunction, writer io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int64) error {
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glog.V(4).Infof("start to stream content for chunks: %+v", chunks)
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chunkViews := ViewFromChunks(masterClient.GetLookupFileIdFunction(), chunks, offset, size)
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fileId2Url := make(map[string][]string)
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for _, chunkView := range chunkViews {
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urlStrings, err := masterClient.GetLookupFileIdFunction()(chunkView.FileId)
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if err != nil {
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glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
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return err
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} else if len(urlStrings) == 0 {
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errUrlNotFound := fmt.Errorf("operation LookupFileId %s failed, err: urls not found", chunkView.FileId)
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glog.Error(errUrlNotFound)
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return errUrlNotFound
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}
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fileId2Url[chunkView.FileId] = urlStrings
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}
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remaining := size
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for _, chunkView := range chunkViews {
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if offset < chunkView.LogicOffset {
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gap := chunkView.LogicOffset - offset
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remaining -= gap
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glog.V(4).Infof("zero [%d,%d)", offset, chunkView.LogicOffset)
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err := writeZero(writer, gap)
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if err != nil {
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return fmt.Errorf("write zero [%d,%d)", offset, chunkView.LogicOffset)
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}
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offset = chunkView.LogicOffset
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}
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urlStrings := fileId2Url[chunkView.FileId]
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start := time.Now()
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err := retriedStreamFetchChunkData(writer, urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
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offset += int64(chunkView.Size)
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remaining -= int64(chunkView.Size)
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stats.FilerRequestHistogram.WithLabelValues("chunkDownload").Observe(time.Since(start).Seconds())
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if err != nil {
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stats.FilerRequestCounter.WithLabelValues("chunkDownloadError").Inc()
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return fmt.Errorf("read chunk: %v", err)
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}
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stats.FilerRequestCounter.WithLabelValues("chunkDownload").Inc()
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}
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if remaining > 0 {
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glog.V(4).Infof("zero [%d,%d)", offset, offset+remaining)
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err := writeZero(writer, remaining)
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if err != nil {
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return fmt.Errorf("write zero [%d,%d)", offset, offset+remaining)
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}
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}
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return nil
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}
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// ---------------- ReadAllReader ----------------------------------
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func writeZero(w io.Writer, size int64) (err error) {
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zeroPadding := make([]byte, 1024)
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var written int
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for size > 0 {
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if size > 1024 {
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written, err = w.Write(zeroPadding)
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} else {
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written, err = w.Write(zeroPadding[:size])
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}
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size -= int64(written)
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if err != nil {
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return
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}
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}
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return
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}
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func ReadAll(buffer []byte, masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) error {
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lookupFileIdFn := func(fileId string) (targetUrls []string, err error) {
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return masterClient.LookupFileId(fileId)
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}
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chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, int64(len(buffer)))
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idx := 0
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for _, chunkView := range chunkViews {
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urlStrings, err := lookupFileIdFn(chunkView.FileId)
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if err != nil {
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glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
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return err
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}
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n, err := retriedFetchChunkData(buffer[idx:idx+int(chunkView.Size)], urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset)
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if err != nil {
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return err
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}
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idx += n
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}
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return nil
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}
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// ---------------- ChunkStreamReader ----------------------------------
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type ChunkStreamReader struct {
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chunkViews []*ChunkView
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totalSize int64
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logicOffset int64
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buffer []byte
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bufferOffset int64
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bufferLock sync.Mutex
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chunk string
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lookupFileId wdclient.LookupFileIdFunctionType
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}
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var _ = io.ReadSeeker(&ChunkStreamReader{})
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var _ = io.ReaderAt(&ChunkStreamReader{})
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func doNewChunkStreamReader(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
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chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, math.MaxInt64)
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slices.SortFunc(chunkViews, func(a, b *ChunkView) bool {
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return a.LogicOffset < b.LogicOffset
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})
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var totalSize int64
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for _, chunk := range chunkViews {
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totalSize += int64(chunk.Size)
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}
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return &ChunkStreamReader{
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chunkViews: chunkViews,
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lookupFileId: lookupFileIdFn,
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totalSize: totalSize,
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}
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}
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func NewChunkStreamReaderFromFiler(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
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lookupFileIdFn := func(fileId string) (targetUrl []string, err error) {
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return masterClient.LookupFileId(fileId)
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}
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return doNewChunkStreamReader(lookupFileIdFn, chunks)
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}
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func NewChunkStreamReader(filerClient filer_pb.FilerClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
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lookupFileIdFn := LookupFn(filerClient)
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return doNewChunkStreamReader(lookupFileIdFn, chunks)
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}
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func (c *ChunkStreamReader) ReadAt(p []byte, off int64) (n int, err error) {
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c.bufferLock.Lock()
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defer c.bufferLock.Unlock()
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if err = c.prepareBufferFor(off); err != nil {
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return
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}
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c.logicOffset = off
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return c.doRead(p)
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}
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func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
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c.bufferLock.Lock()
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defer c.bufferLock.Unlock()
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return c.doRead(p)
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}
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func (c *ChunkStreamReader) doRead(p []byte) (n int, err error) {
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// fmt.Printf("do read [%d,%d) at %s[%d,%d)\n", c.logicOffset, c.logicOffset+int64(len(p)), c.chunk, c.bufferOffset, c.bufferOffset+int64(len(c.buffer)))
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for n < len(p) {
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// println("read", c.logicOffset)
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if err = c.prepareBufferFor(c.logicOffset); err != nil {
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return
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}
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t := copy(p[n:], c.buffer[c.logicOffset-c.bufferOffset:])
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n += t
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c.logicOffset += int64(t)
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}
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return
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}
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func (c *ChunkStreamReader) isBufferEmpty() bool {
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return len(c.buffer) <= int(c.logicOffset-c.bufferOffset)
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}
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func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
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c.bufferLock.Lock()
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defer c.bufferLock.Unlock()
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var err error
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switch whence {
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case io.SeekStart:
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case io.SeekCurrent:
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offset += c.logicOffset
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case io.SeekEnd:
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offset = c.totalSize + offset
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}
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if offset > c.totalSize {
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err = io.ErrUnexpectedEOF
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} else {
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c.logicOffset = offset
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}
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return offset, err
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}
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func insideChunk(offset int64, chunk *ChunkView) bool {
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return chunk.LogicOffset <= offset && offset < chunk.LogicOffset+int64(chunk.Size)
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}
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func (c *ChunkStreamReader) prepareBufferFor(offset int64) (err error) {
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// stay in the same chunk
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if c.bufferOffset <= offset && offset < c.bufferOffset+int64(len(c.buffer)) {
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return nil
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}
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// fmt.Printf("fetch for offset %d\n", offset)
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// need to seek to a different chunk
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currentChunkIndex := sort.Search(len(c.chunkViews), func(i int) bool {
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return offset < c.chunkViews[i].LogicOffset
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})
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if currentChunkIndex == len(c.chunkViews) {
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// not found
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if insideChunk(offset, c.chunkViews[0]) {
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// fmt.Printf("select0 chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
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currentChunkIndex = 0
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} else if insideChunk(offset, c.chunkViews[len(c.chunkViews)-1]) {
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currentChunkIndex = len(c.chunkViews) - 1
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// fmt.Printf("select last chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
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} else {
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return io.EOF
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}
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} else if currentChunkIndex > 0 {
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if insideChunk(offset, c.chunkViews[currentChunkIndex]) {
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// good hit
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} else if insideChunk(offset, c.chunkViews[currentChunkIndex-1]) {
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currentChunkIndex -= 1
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// fmt.Printf("select -1 chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
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} else {
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// glog.Fatalf("unexpected1 offset %d", offset)
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return fmt.Errorf("unexpected1 offset %d", offset)
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}
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} else {
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// glog.Fatalf("unexpected2 offset %d", offset)
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return fmt.Errorf("unexpected2 offset %d", offset)
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}
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// positioning within the new chunk
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chunk := c.chunkViews[currentChunkIndex]
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if insideChunk(offset, chunk) {
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if c.isBufferEmpty() || c.bufferOffset != chunk.LogicOffset {
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if err = c.fetchChunkToBuffer(chunk); err != nil {
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return
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}
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}
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} else {
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// glog.Fatalf("unexpected3 offset %d in %s [%d,%d)", offset, chunk.FileId, chunk.LogicOffset, chunk.LogicOffset+int64(chunk.Size))
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return fmt.Errorf("unexpected3 offset %d in %s [%d,%d)", offset, chunk.FileId, chunk.LogicOffset, chunk.LogicOffset+int64(chunk.Size))
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}
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return
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}
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func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
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urlStrings, err := c.lookupFileId(chunkView.FileId)
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if err != nil {
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glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
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return err
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}
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var buffer bytes.Buffer
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var shouldRetry bool
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for _, urlString := range urlStrings {
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shouldRetry, err = util.ReadUrlAsStream(urlString+"?readDeleted=true", chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
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buffer.Write(data)
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})
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if !shouldRetry {
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break
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}
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if err != nil {
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glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
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buffer.Reset()
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} else {
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break
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}
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}
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if err != nil {
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return err
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}
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c.buffer = buffer.Bytes()
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c.bufferOffset = chunkView.LogicOffset
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c.chunk = chunkView.FileId
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// glog.V(0).Infof("fetched %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
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return nil
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}
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func (c *ChunkStreamReader) Close() {
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// TODO try to release and reuse buffer
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}
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func VolumeId(fileId string) string {
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lastCommaIndex := strings.LastIndex(fileId, ",")
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if lastCommaIndex > 0 {
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return fileId[:lastCommaIndex]
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}
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return fileId
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}
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