seaweedfs/weed/filer/stream.go

320 lines
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package filer
import (
"bytes"
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"fmt"
"io"
"math"
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"sort"
"strings"
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"time"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/stats"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/wdclient"
)
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func HasData(entry *filer_pb.Entry) bool {
if len(entry.Content) > 0 {
return true
}
return len(entry.Chunks) > 0
}
func IsSameData(a, b *filer_pb.Entry) bool {
if len(a.Content) > 0 || len(b.Content) > 0 {
return bytes.Equal(a.Content, b.Content)
}
return isSameChunks(a.Chunks, b.Chunks)
}
func isSameChunks(a, b []*filer_pb.FileChunk) bool {
if len(a) != len(b) {
return false
}
sort.Slice(a, func(i, j int) bool {
return strings.Compare(a[i].ETag, a[j].ETag) < 0
})
sort.Slice(b, func(i, j int) bool {
return strings.Compare(b[i].ETag, b[j].ETag) < 0
})
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for i := 0; i < len(a); i++ {
if a[i].ETag != b[i].ETag {
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return false
}
}
return true
}
func NewFileReader(filerClient filer_pb.FilerClient, entry *filer_pb.Entry) io.Reader {
if len(entry.Content) > 0 {
return bytes.NewReader(entry.Content)
}
return NewChunkStreamReader(filerClient, entry.Chunks)
}
func StreamContent(masterClient wdclient.HasLookupFileIdFunction, writer io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int64) error {
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glog.V(9).Infof("start to stream content for chunks: %+v\n", chunks)
chunkViews := ViewFromChunks(masterClient.GetLookupFileIdFunction(), chunks, offset, size)
fileId2Url := make(map[string][]string)
for _, chunkView := range chunkViews {
urlStrings, err := masterClient.GetLookupFileIdFunction()(chunkView.FileId)
if err != nil {
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
return err
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} else if len(urlStrings) == 0 {
glog.Errorf("operation LookupFileId %s failed, err: urls not found", chunkView.FileId)
return fmt.Errorf("operation LookupFileId %s failed, err: urls not found", chunkView.FileId)
}
fileId2Url[chunkView.FileId] = urlStrings
}
for _, chunkView := range chunkViews {
urlStrings := fileId2Url[chunkView.FileId]
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start := time.Now()
err := retriedStreamFetchChunkData(writer, urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(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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stats.FilerRequestCounter.WithLabelValues("chunkDownload").Inc()
}
return nil
}
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// ---------------- ReadAllReader ----------------------------------
func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) ([]byte, error) {
buffer := bytes.Buffer{}
lookupFileIdFn := func(fileId string) (targetUrls []string, err error) {
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return masterClient.LookupFileId(fileId)
}
chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, math.MaxInt64)
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for _, chunkView := range chunkViews {
urlStrings, err := lookupFileIdFn(chunkView.FileId)
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if err != nil {
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
return nil, err
}
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data, err := retriedFetchChunkData(urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
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if err != nil {
return nil, err
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}
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buffer.Write(data)
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}
return buffer.Bytes(), nil
}
// ---------------- ChunkStreamReader ----------------------------------
type ChunkStreamReader struct {
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chunkViews []*ChunkView
totalSize int64
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logicOffset int64
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buffer []byte
bufferOffset int64
bufferPos int
nextChunkViewIndex int
lookupFileId wdclient.LookupFileIdFunctionType
}
var _ = io.ReadSeeker(&ChunkStreamReader{})
var _ = io.ReaderAt(&ChunkStreamReader{})
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func doNewChunkStreamReader(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, math.MaxInt64)
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sort.Slice(chunkViews, func(i, j int) bool {
return chunkViews[i].LogicOffset < chunkViews[j].LogicOffset
})
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var totalSize int64
for _, chunk := range chunkViews {
totalSize += int64(chunk.Size)
}
return &ChunkStreamReader{
chunkViews: chunkViews,
lookupFileId: lookupFileIdFn,
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totalSize: totalSize,
}
}
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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) {
return masterClient.LookupFileId(fileId)
}
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return doNewChunkStreamReader(lookupFileIdFn, chunks)
}
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func NewChunkStreamReader(filerClient filer_pb.FilerClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
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lookupFileIdFn := LookupFn(filerClient)
return doNewChunkStreamReader(lookupFileIdFn, chunks)
}
func (c *ChunkStreamReader) ReadAt(p []byte, off int64) (n int, err error) {
if err = c.prepareBufferFor(off); err != nil {
return
}
c.logicOffset = off
return c.Read(p)
}
func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
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for n < len(p) {
if c.isBufferEmpty() {
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if c.nextChunkViewIndex >= len(c.chunkViews) {
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return n, io.EOF
}
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chunkView := c.chunkViews[c.nextChunkViewIndex]
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if err = c.fetchChunkToBuffer(chunkView); err != nil {
return
}
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c.nextChunkViewIndex++
}
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t := copy(p[n:], c.buffer[c.bufferPos:])
c.bufferPos += t
n += t
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c.logicOffset += int64(t)
}
return
}
func (c *ChunkStreamReader) isBufferEmpty() bool {
return len(c.buffer) <= c.bufferPos
}
func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
var err error
switch whence {
case io.SeekStart:
case io.SeekCurrent:
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offset += c.logicOffset
case io.SeekEnd:
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offset = c.totalSize + offset
}
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if offset > c.totalSize {
err = io.ErrUnexpectedEOF
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} else {
c.logicOffset = offset
}
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return offset, err
}
func (c *ChunkStreamReader) prepareBufferFor(offset int64) (err error) {
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// stay in the same chunk
if !c.isBufferEmpty() {
if c.bufferOffset <= offset && offset < c.bufferOffset+int64(len(c.buffer)) {
c.bufferPos = int(offset - c.bufferOffset)
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return nil
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}
}
// need to seek to a different chunk
currentChunkIndex := sort.Search(len(c.chunkViews), func(i int) bool {
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return offset < c.chunkViews[i].LogicOffset
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})
if currentChunkIndex == len(c.chunkViews) {
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// not found
if c.chunkViews[0].LogicOffset <= offset {
currentChunkIndex = 0
} else if c.chunkViews[len(c.chunkViews)-1].LogicOffset <= offset {
currentChunkIndex = len(c.chunkViews) -1
} else {
return io.EOF
}
} else if currentChunkIndex > 0 {
if c.chunkViews[currentChunkIndex-1].LogicOffset <= offset {
currentChunkIndex -= 1
} else {
return fmt.Errorf("unexpected1 offset %d", offset)
}
} else {
return fmt.Errorf("unexpected2 offset %d", offset)
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}
// positioning within the new chunk
chunk := c.chunkViews[currentChunkIndex]
if chunk.LogicOffset <= offset && offset < chunk.LogicOffset+int64(chunk.Size) {
if c.isBufferEmpty() || c.bufferOffset != chunk.LogicOffset {
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if err = c.fetchChunkToBuffer(chunk); err != nil {
return
}
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c.nextChunkViewIndex = currentChunkIndex + 1
}
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c.bufferPos = int(offset - c.bufferOffset)
}
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return
}
func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
urlStrings, err := c.lookupFileId(chunkView.FileId)
if err != nil {
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
return err
}
var buffer bytes.Buffer
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var shouldRetry bool
for _, urlString := range urlStrings {
shouldRetry, err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
buffer.Write(data)
})
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if !shouldRetry {
break
}
if err != nil {
glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
buffer.Reset()
} else {
break
}
}
if err != nil {
return err
}
c.buffer = buffer.Bytes()
c.bufferPos = 0
c.bufferOffset = chunkView.LogicOffset
// glog.V(0).Infof("read %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
return nil
}
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func (c *ChunkStreamReader) Close() {
// TODO try to release and reuse buffer
}
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func VolumeId(fileId string) string {
lastCommaIndex := strings.LastIndex(fileId, ",")
if lastCommaIndex > 0 {
return fileId[:lastCommaIndex]
}
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return fileId
}