fixed `volume xx not found` caused by missing VolumeLocation events

When the requested master node is the leader, `VolumeLocation` or `ClusterNodeUpdate` may be returned here. If it is `VolumeLocation`, the update will be performed while resetting the vidMap, otherwise the event will be lost

weed/wdclient/masterclient.go

@@ -168,15 +168,19 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 		}
 
 		// check if it is the leader to determine whether to reset the vidMap
-		if resp.VolumeLocation != nil && resp.VolumeLocation.Leader != "" && string(master) != resp.VolumeLocation.Leader {
-			glog.V(0).Infof("master %v redirected to leader %v", master, resp.VolumeLocation.Leader)
-			nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
-			stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToleader).Inc()
-			return nil
+		if resp.VolumeLocation != nil {
+			if resp.VolumeLocation.Leader != "" && string(master) != resp.VolumeLocation.Leader {
+				glog.V(0).Infof("master %v redirected to leader %v", master, resp.VolumeLocation.Leader)
+				nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
+				stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToleader).Inc()
+				return nil
+			}
+			mc.vidMap = newVidMap("")
+			mc.updateVidMap(resp)
+		} else {
+			mc.vidMap = newVidMap("")
 		}
-
 		mc.currentMaster = master
-		mc.vidMap = newVidMap("")
 
 		for {
 			resp, err := stream.Recv()
@@ -195,29 +199,7 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 					return nil
 				}
 
-				// process new volume location
-				loc := Location{
-					Url:        resp.VolumeLocation.Url,
-					PublicUrl:  resp.VolumeLocation.PublicUrl,
-					DataCenter: resp.VolumeLocation.DataCenter,
-					GrpcPort:   int(resp.VolumeLocation.GrpcPort),
-				}
-				for _, newVid := range resp.VolumeLocation.NewVids {
-					glog.V(1).Infof("%s.%s: %s masterClient adds volume %d", mc.FilerGroup, mc.clientType, loc.Url, newVid)
-					mc.addLocation(newVid, loc)
-				}
-				for _, deletedVid := range resp.VolumeLocation.DeletedVids {
-					glog.V(1).Infof("%s.%s: %s masterClient removes volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedVid)
-					mc.deleteLocation(deletedVid, loc)
-				}
-				for _, newEcVid := range resp.VolumeLocation.NewEcVids {
-					glog.V(1).Infof("%s.%s: %s masterClient adds ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, newEcVid)
-					mc.addEcLocation(newEcVid, loc)
-				}
-				for _, deletedEcVid := range resp.VolumeLocation.DeletedEcVids {
-					glog.V(1).Infof("%s.%s: %s masterClient removes ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedEcVid)
-					mc.deleteEcLocation(deletedEcVid, loc)
-				}
+				mc.updateVidMap(resp)
 			}
 
 			if resp.ClusterNodeUpdate != nil {
@@ -245,6 +227,32 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 	return
 }
 
+func (mc *MasterClient) updateVidMap(resp *master_pb.KeepConnectedResponse) {
+	// process new volume location
+	loc := Location{
+		Url:        resp.VolumeLocation.Url,
+		PublicUrl:  resp.VolumeLocation.PublicUrl,
+		DataCenter: resp.VolumeLocation.DataCenter,
+		GrpcPort:   int(resp.VolumeLocation.GrpcPort),
+	}
+	for _, newVid := range resp.VolumeLocation.NewVids {
+		glog.V(1).Infof("%s.%s: %s masterClient adds volume %d", mc.FilerGroup, mc.clientType, loc.Url, newVid)
+		mc.addLocation(newVid, loc)
+	}
+	for _, deletedVid := range resp.VolumeLocation.DeletedVids {
+		glog.V(1).Infof("%s.%s: %s masterClient removes volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedVid)
+		mc.deleteLocation(deletedVid, loc)
+	}
+	for _, newEcVid := range resp.VolumeLocation.NewEcVids {
+		glog.V(1).Infof("%s.%s: %s masterClient adds ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, newEcVid)
+		mc.addEcLocation(newEcVid, loc)
+	}
+	for _, deletedEcVid := range resp.VolumeLocation.DeletedEcVids {
+		glog.V(1).Infof("%s.%s: %s masterClient removes ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedEcVid)
+		mc.deleteEcLocation(deletedEcVid, loc)
+	}
+}
+
 func (mc *MasterClient) WithClient(streamingMode bool, fn func(client master_pb.SeaweedClient) error) error {
 	return util.Retry("master grpc", func() error {
 		for mc.currentMaster == "" {