From 0cf5a72c2abd8ac51b05ed2c04841f253a56befc Mon Sep 17 00:00:00 2001
From: CFC4N <cfc4n@cnxct.com>
Date: Mon, 17 Aug 2020 21:41:19 +0800
Subject: [PATCH] credentials: let GetRequestMetadata() return nil when
 authToken isn't initialized.

Signed-off-by: Chao Chen <chaochn@amazon.com>
---
 clientv3/credentials/credentials.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/clientv3/credentials/credentials.go b/clientv3/credentials/credentials.go
index 63389c08b..c1a2ec5fd 100644
--- a/clientv3/credentials/credentials.go
+++ b/clientv3/credentials/credentials.go
@@ -156,6 +156,9 @@ 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
 }