functional/tester: add sendOpWithResp for SnapshotInfo

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

functional/tester/cluster.go

@@ -393,6 +393,11 @@ func (clus *Cluster) broadcast(op rpcpb.Operation) error {
 }
 
 func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
+	_, err := clus.sendOpWithResp(idx, op)
+	return err
+}
+
+func (clus *Cluster) sendOpWithResp(idx int, op rpcpb.Operation) (*rpcpb.Response, error) {
 	// maintain the initial member object
 	// throughout the test time
 	clus.agentRequests[idx] = &rpcpb.Request{
@@ -409,7 +414,7 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 		zap.Error(err),
 	)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	resp, err := clus.agentStreams[idx].Recv()
@@ -431,18 +436,18 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 		)
 	}
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	if !resp.Success {
-		return errors.New(resp.Status)
+		return nil, errors.New(resp.Status)
 	}
 
 	m, secure := clus.Members[idx], false
 	for _, cu := range m.Etcd.AdvertiseClientURLs {
 		u, err := url.Parse(cu)
 		if err != nil {
-			return err
+			return nil, err
 		}
 		if u.Scheme == "https" { // TODO: handle unix
 			secure = true
@@ -458,16 +463,16 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 			"client",
 		)
 		if err = fileutil.TouchDirAll(dirClient); err != nil {
-			return err
+			return nil, err
 		}
 
 		clientCertData := []byte(resp.Member.ClientCertData)
 		if len(clientCertData) == 0 {
-			return fmt.Errorf("got empty client cert from %q", m.EtcdClientEndpoint)
+			return nil, fmt.Errorf("got empty client cert from %q", m.EtcdClientEndpoint)
 		}
 		clientCertPath := filepath.Join(dirClient, "cert.pem")
 		if err = ioutil.WriteFile(clientCertPath, clientCertData, 0644); err != nil { // overwrite if exists
-			return err
+			return nil, err
 		}
 		resp.Member.ClientCertPath = clientCertPath
 		clus.lg.Info(
@@ -477,11 +482,11 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 
 		clientKeyData := []byte(resp.Member.ClientKeyData)
 		if len(clientKeyData) == 0 {
-			return fmt.Errorf("got empty client key from %q", m.EtcdClientEndpoint)
+			return nil, fmt.Errorf("got empty client key from %q", m.EtcdClientEndpoint)
 		}
 		clientKeyPath := filepath.Join(dirClient, "key.pem")
 		if err = ioutil.WriteFile(clientKeyPath, clientKeyData, 0644); err != nil { // overwrite if exists
-			return err
+			return nil, err
 		}
 		resp.Member.ClientKeyPath = clientKeyPath
 		clus.lg.Info(
@@ -494,7 +499,7 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 			// TODO: disable this when auto TLS is deprecated
 			clientTrustedCAPath := filepath.Join(dirClient, "ca.pem")
 			if err = ioutil.WriteFile(clientTrustedCAPath, clientTrustedCAData, 0644); err != nil { // overwrite if exists
-				return err
+				return nil, err
 			}
 			resp.Member.ClientTrustedCAPath = clientTrustedCAPath
 			clus.lg.Info(
@@ -507,7 +512,8 @@ func (clus *Cluster) sendOp(idx int, op rpcpb.Operation) error {
 
 		clus.Members[idx] = resp.Member
 	}
-	return nil
+
+	return resp, nil
 }
 
 // Send_SIGQUIT_ETCD_AND_REMOVE_DATA_AND_STOP_AGENT terminates all tester connections to agents and etcd servers.