Merge branch 'master' of https://github.com/chrislusf/seaweedfs

weed/server/master_grpc_server_raft.go

@@ -11,6 +11,10 @@ import (
 func (ms *MasterServer) RaftListClusterServers(ctx context.Context, req *master_pb.RaftListClusterServersRequest) (*master_pb.RaftListClusterServersResponse, error) {
 	resp := &master_pb.RaftListClusterServersResponse{}
 
+	if ms.Topo.HashicorpRaft == nil {
+		return resp, nil
+	}
+
 	servers := ms.Topo.HashicorpRaft.GetConfiguration().Configuration().Servers
 
 	for _, server := range servers {
@@ -25,6 +29,11 @@ func (ms *MasterServer) RaftListClusterServers(ctx context.Context, req *master_
 
 func (ms *MasterServer) RaftAddServer(ctx context.Context, req *master_pb.RaftAddServerRequest) (*master_pb.RaftAddServerResponse, error) {
 	resp := &master_pb.RaftAddServerResponse{}
+
+	if ms.Topo.HashicorpRaft == nil {
+		return resp, nil
+	}
+
 	if ms.Topo.HashicorpRaft.State() != raft.Leader {
 		return nil, fmt.Errorf("raft add server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
 	}
@@ -45,6 +54,10 @@ func (ms *MasterServer) RaftAddServer(ctx context.Context, req *master_pb.RaftAd
 func (ms *MasterServer) RaftRemoveServer(ctx context.Context, req *master_pb.RaftRemoveServerRequest) (*master_pb.RaftRemoveServerResponse, error) {
 	resp := &master_pb.RaftRemoveServerResponse{}
 
+	if ms.Topo.HashicorpRaft == nil {
+		return resp, nil
+	}
+
 	if ms.Topo.HashicorpRaft.State() != raft.Leader {
 		return nil, fmt.Errorf("raft remove server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
 	}