mirror of
https://github.com/seaweedfs/seaweedfs.git
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101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package filer2
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import (
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"bytes"
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"fmt"
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"io"
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"math"
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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/util"
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"github.com/chrislusf/seaweedfs/weed/wdclient"
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)
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func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int) error {
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chunkViews := ViewFromChunks(chunks, offset, size)
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fileId2Url := make(map[string]string)
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for _, chunkView := range chunkViews {
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urlString, err := masterClient.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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fileId2Url[chunkView.FileId] = urlString
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}
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for _, chunkView := range chunkViews {
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urlString := fileId2Url[chunkView.FileId]
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err := util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.isGzipped, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
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w.Write(data)
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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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return err
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}
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}
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return nil
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}
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type ChunkStreamReader struct {
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masterClient *wdclient.MasterClient
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chunkViews []*ChunkView
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logicOffset int64
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buffer bytes.Buffer
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bufferOffset int64
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chunkIndex int
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}
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var _ = io.ReadSeeker(&ChunkStreamReader{})
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func NewChunkStreamReader(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
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chunkViews := ViewFromChunks(chunks, 0, math.MaxInt32)
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return &ChunkStreamReader{
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masterClient: masterClient,
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chunkViews: chunkViews,
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bufferOffset: -1,
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}
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}
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func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
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if c.buffer.Len() == 0 {
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if c.chunkIndex >= len(c.chunkViews) {
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return 0, io.EOF
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}
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chunkView := c.chunkViews[c.chunkIndex]
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c.fetchChunkToBuffer(chunkView)
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c.chunkIndex++
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}
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return c.buffer.Read(p)
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}
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func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
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return 0, fmt.Errorf("ChunkStreamReader: seek not supported")
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}
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func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
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urlString, err := c.masterClient.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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c.buffer.Reset()
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err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.isGzipped, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
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c.buffer.Write(data)
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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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return err
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}
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return nil
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}
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