client/v3: do not overwrite authTokenBundle on dial

Cherry pick the PR https://github.com/etcd-io/etcd/pull/12992
to 3.5, so please refer to the original PR for more detailed info.

Signed-off-by: Benjamin Wang <wachao@vmware.com>

client/v3/client.go

@@ -286,8 +286,7 @@ func (c *Client) dial(creds grpccredentials.TransportCredentials, dopts ...grpc.
 	if err != nil {
 		return nil, fmt.Errorf("failed to configure dialer: %v", err)
 	}
-	if c.Username != "" && c.Password != "" {
-		c.authTokenBundle = credentials.NewBundle(credentials.Config{})
+	if c.authTokenBundle != nil {
 		opts = append(opts, grpc.WithPerRPCCredentials(c.authTokenBundle.PerRPCCredentials()))
 	}
 
@@ -383,6 +382,7 @@ func newClient(cfg *Config) (*Client, error) {
 	if cfg.Username != "" && cfg.Password != "" {
 		client.Username = cfg.Username
 		client.Password = cfg.Password
+		client.authTokenBundle = credentials.NewBundle(credentials.Config{})
 	}
 	if cfg.MaxCallSendMsgSize > 0 || cfg.MaxCallRecvMsgSize > 0 {
 		if cfg.MaxCallRecvMsgSize > 0 && cfg.MaxCallSendMsgSize > cfg.MaxCallRecvMsgSize {

client/v3/client_test.go

@@ -200,6 +200,55 @@ func TestZapWithLogger(t *testing.T) {
 	}
 }
 
+func TestAuthTokenBundleNoOverwrite(t *testing.T) {
+	// Create a mock AuthServer to handle Authenticate RPCs.
+	lis, err := net.Listen("unix", "etcd-auth-test:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer lis.Close()
+	addr := "unix:" + lis.Addr().String()
+	srv := grpc.NewServer()
+	etcdserverpb.RegisterAuthServer(srv, mockAuthServer{})
+	go srv.Serve(lis)
+	defer srv.Stop()
+
+	// Create a client, which should call Authenticate on the mock server to
+	// exchange username/password for an auth token.
+	c, err := NewClient(t, Config{
+		DialTimeout: 5 * time.Second,
+		Endpoints:   []string{addr},
+		Username:    "foo",
+		Password:    "bar",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	oldTokenBundle := c.authTokenBundle
+
+	// Call the public Dial again, which should preserve the original
+	// authTokenBundle.
+	gc, err := c.Dial(addr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer gc.Close()
+	newTokenBundle := c.authTokenBundle
+
+	if oldTokenBundle != newTokenBundle {
+		t.Error("Client.authTokenBundle has been overwritten during Client.Dial")
+	}
+}
+
+type mockAuthServer struct {
+	*etcdserverpb.UnimplementedAuthServer
+}
+
+func (mockAuthServer) Authenticate(context.Context, *etcdserverpb.AuthenticateRequest) (*etcdserverpb.AuthenticateResponse, error) {
+	return &etcdserverpb.AuthenticateResponse{Token: "mock-token"}, nil
+}
+
 func TestSyncFiltersMembers(t *testing.T) {
 	c, _ := NewClient(t, Config{Endpoints: []string{"http://254.0.0.1:12345"}})
 	defer c.Close()