From 747cc70c3ceb145796fce87e9b6e7ec5fc68abf6 Mon Sep 17 00:00:00 2001
From: Hitoshi Mitake <h.mitake@gmail.com>
Date: Sun, 16 Aug 2020 00:54:30 +0900
Subject: [PATCH] clientv3: let GetRequestMetadata() return nil when authToken
 isn't initialized

---
 clientv3/credentials/credentials.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/clientv3/credentials/credentials.go b/clientv3/credentials/credentials.go
index eb3c81aaa5ab..bb049d045679 100644
--- a/clientv3/credentials/credentials.go
+++ b/clientv3/credentials/credentials.go
@@ -111,6 +111,9 @@ func (rc *perRPCCredential) GetRequestMetadata(ctx context.Context, s ...string)
 	rc.authTokenMu.RLock()
 	authToken := rc.authToken
 	rc.authTokenMu.RUnlock()
+	if authToken == "" {
+		return nil, nil
+	}
 	return map[string]string{rpctypes.TokenFieldNameGRPC: authToken}, nil
 }