From d1ab16b6e312b8a218b974ecf9caa3d4b0103eb6 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Fri, 10 Jan 2020 00:37:44 -0800
Subject: [PATCH] treat it as a single node cluster if empty raft server name

possible fix for https://github.com/chrislusf/seaweedfs/issues/1118
---
 weed/topology/topology.go | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index e6cb44727..fbf998707 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -60,7 +60,12 @@ func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, puls
 
 func (t *Topology) IsLeader() bool {
 	if t.RaftServer != nil {
-		return t.RaftServer.State() == raft.Leader
+		if t.RaftServer.State() == raft.Leader {
+			return true
+		}
+		if t.RaftServer.Leader() == "" {
+			return true
+		}
 	}
 	return false
 }
@@ -75,7 +80,7 @@ func (t *Topology) Leader() (string, error) {
 
 	if l == "" {
 		// We are a single node cluster, we are the leader
-		return t.RaftServer.Name(), errors.New("Raft Server not initialized!")
+		return t.RaftServer.Name(), nil
 	}
 
 	return l, nil
@@ -152,7 +157,7 @@ func (t *Topology) ListCollections(includeNormalVolumes, includeEcVolumes bool)
 		t.ecShardMapLock.RUnlock()
 	}
 
-	for k, _ := range mapOfCollections {
+	for k := range mapOfCollections {
 		ret = append(ret, k)
 	}
 	return ret