stream read multiple volumes in a volume server

weed/server/volume_grpc_read_all.go

@@ -10,13 +10,23 @@ import (
 
 func (vs *VolumeServer) ReadAllNeedles(req *volume_server_pb.ReadAllNeedlesRequest, stream volume_server_pb.VolumeServer_ReadAllNeedlesServer) (err error) {
 
-	v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
+	for _, vid := range req.VolumeIds {
+		if err := vs.streaReadOneVolume(needle.VolumeId(vid), stream, err); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (vs *VolumeServer) streaReadOneVolume(vid needle.VolumeId, stream volume_server_pb.VolumeServer_ReadAllNeedlesServer, err error) error {
+	v := vs.store.GetVolume(vid)
 	if v == nil {
-		return fmt.Errorf("not found volume id %d", req.VolumeId)
+		return fmt.Errorf("not found volume id %d", vid)
 	}
 
 	scanner := &VolumeFileScanner4ReadAll{
 		stream: stream,
+		v:      v,
 	}
 
 	offset := int64(v.SuperBlock.BlockSize())
@@ -24,11 +34,11 @@ func (vs *VolumeServer) ReadAllNeedles(req *volume_server_pb.ReadAllNeedlesReque
 	err = storage.ScanVolumeFileFrom(v.Version(), v.DataBackend, offset, scanner)
 
 	return err
-
 }
 
 type VolumeFileScanner4ReadAll struct {
 	stream volume_server_pb.VolumeServer_ReadAllNeedlesServer
+	v      *storage.Volume
 }
 
 func (scanner *VolumeFileScanner4ReadAll) VisitSuperBlock(superBlock super_block.SuperBlock) error {
@@ -42,7 +52,9 @@ func (scanner *VolumeFileScanner4ReadAll) ReadNeedleBody() bool {
 func (scanner *VolumeFileScanner4ReadAll) VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error {
 
 	sendErr := scanner.stream.Send(&volume_server_pb.ReadAllNeedlesResponse{
+		VolumeId:   uint32(scanner.v.Id),
 		NeedleId:   uint64(n.Id),
+		Cookie:     uint32(n.Cookie),
 		NeedleBlob: n.Data,
 	})
 	if sendErr != nil {