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package filer2
import (
"io"
"github.com/joeslay/seaweedfs/weed/glog"
"github.com/joeslay/seaweedfs/weed/pb/filer_pb"
"github.com/joeslay/seaweedfs/weed/util"
"github.com/joeslay/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.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
}
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