mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-03 00:49:13 +08:00
101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package filer2
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"math"
|
|
|
|
"github.com/chrislusf/seaweedfs/weed/glog"
|
|
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
|
|
"github.com/chrislusf/seaweedfs/weed/util"
|
|
"github.com/chrislusf/seaweedfs/weed/wdclient"
|
|
)
|
|
|
|
func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int) error {
|
|
|
|
chunkViews := ViewFromChunks(chunks, offset, size)
|
|
|
|
fileId2Url := make(map[string]string)
|
|
|
|
for _, chunkView := range chunkViews {
|
|
|
|
urlString, err := masterClient.LookupFileId(chunkView.FileId)
|
|
if err != nil {
|
|
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
|
|
return err
|
|
}
|
|
fileId2Url[chunkView.FileId] = urlString
|
|
}
|
|
|
|
for _, chunkView := range chunkViews {
|
|
|
|
urlString := fileId2Url[chunkView.FileId]
|
|
err := util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.isGzipped, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
|
|
w.Write(data)
|
|
})
|
|
if err != nil {
|
|
glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
type ChunkStreamReader struct {
|
|
masterClient *wdclient.MasterClient
|
|
chunkViews []*ChunkView
|
|
logicOffset int64
|
|
buffer bytes.Buffer
|
|
bufferOffset int64
|
|
chunkIndex int
|
|
}
|
|
|
|
var _ = io.ReadSeeker(&ChunkStreamReader{})
|
|
|
|
func NewChunkStreamReader(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
|
|
|
|
chunkViews := ViewFromChunks(chunks, 0, math.MaxInt32)
|
|
|
|
return &ChunkStreamReader{
|
|
masterClient: masterClient,
|
|
chunkViews: chunkViews,
|
|
bufferOffset: -1,
|
|
}
|
|
}
|
|
|
|
func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
|
|
if c.buffer.Len() == 0 {
|
|
if c.chunkIndex >= len(c.chunkViews) {
|
|
return 0, io.EOF
|
|
}
|
|
chunkView := c.chunkViews[c.chunkIndex]
|
|
c.fetchChunkToBuffer(chunkView)
|
|
c.chunkIndex++
|
|
}
|
|
return c.buffer.Read(p)
|
|
}
|
|
|
|
func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
|
|
return 0, fmt.Errorf("ChunkStreamReader: seek not supported")
|
|
}
|
|
|
|
func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
|
|
urlString, err := c.masterClient.LookupFileId(chunkView.FileId)
|
|
if err != nil {
|
|
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
|
|
return err
|
|
}
|
|
c.buffer.Reset()
|
|
err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.isGzipped, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
|
|
c.buffer.Write(data)
|
|
})
|
|
if err != nil {
|
|
glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|