Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/232#discussion_r112549415
--- Diff: cli/tests/NetworkIO_unittest.cpp ---
@@ -0,0 +1,182 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ **/
+
+#include <cstddef>
+#include <cstdio>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "cli/Flags.hpp"
+#include "cli/LineReaderBuffered.hpp"
+#include "cli/NetworkCliClient.hpp"
+#include "cli/NetworkIO.hpp"
+#include "threading/ConditionVariable.hpp"
+#include "threading/Mutex.hpp"
+#include "threading/Thread.hpp"
+
+#include "glog/logging.h"
+#include "gtest/gtest.h"
+
+using std::unique_ptr;
+
+namespace quickstep {
+
+static std::string const kQueryRequest = "O Captain! My Captain!";
+static std::string const kQueryResponse = "Our fearful trip is done,";
+
+/**
+ * Contains a server instance for testing.
+ */
+class TestNetworkIO {
+ public:
+ TestNetworkIO()
+ : service_(),
+ server_address_("localhost:" + std::to_string(FLAGS_port)),
+ server_(nullptr) {
+ grpc::ServerBuilder builder;
+ builder.AddListeningPort(server_address_,
grpc::InsecureServerCredentials());
+ builder.RegisterService(&service_);
+ server_ = builder.BuildAndStart();
+ CHECK(server_) << "Failed to start server";
+ LOG(INFO) << "TestSingleNodeServer listening on " << server_address_;
+ }
+
+ // Gets a message from the Service worker.
+ std::string getSentMessage() {
+ networkio_internal::RequestState& requestState =
service_.getRequestState();
+ std::unique_lock<std::mutex> lock(requestState.mutex_);
+ while (!requestState.request_ready_)
+ requestState.condition_.wait(lock);
+
+ EXPECT_EQ(requestState.request_ready_, true);
+ EXPECT_EQ(requestState.response_ready_, false);
+
+ return requestState.request_buffer_;
+ }
+
+ // Sets the response message of the Service worker. Alerts it that the
request is ready.
+ void setResponse(std::string response) {
+ networkio_internal::RequestState& requestState =
service_.getRequestState();
+ requestState.response_message_.set_query_result(response);
+
+ EXPECT_EQ(requestState.response_ready_, false);
+
+ requestState.responseReady();
+ }
+
+ NetworkCliServiceImpl& getService() {
+ return service_;
+ }
+
+ ~TestNetworkIO() {
+ service_.kill();
+ server_->Shutdown();
+ server_->Wait();
+ }
+
+ private:
+ NetworkCliServiceImpl service_;
+ std::string server_address_;
+ std::unique_ptr<grpc::Server> server_;
+};
+
+/**
+ * Tests that killing the service will cancel requests.
+ */
+TEST(NetworkIOTest, TestShutdown) {
+ TestNetworkIO server;
+
+ server.getService().kill();
+
+ NetworkCliClient client(
+ grpc::CreateChannel("localhost:" + std::to_string(FLAGS_port),
+ grpc::InsecureChannelCredentials()));
+ QueryRequest request;
+ request.set_query(kQueryRequest);
+ QueryResponse response;
+ Status status = client.SendQuery(request, &response);
+ ASSERT_EQ(status.error_code(), grpc::CANCELLED);
+}
+
+/**
+ * Tests a simple call and response to the Service.
+ */
+TEST(NetworkIOTest, TestNetworkIOCommandInteraction) {
+ NetworkIO networkIO;
+ std::string const query_stmt = kQueryRequest + ";" + kQueryRequest;
+
+ // This thread will handle the response from the client in a similar way
as the quickstep cli will.
+ std::thread server_handler([&networkIO, &query_stmt]() {
+ std::string command = networkIO.getNextCommand();
+ EXPECT_EQ(command, query_stmt);
+
+ // Set some output for the main test thread, return.
+ fprintf(networkIO.out(), "%s", kQueryResponse.c_str());
+ networkIO.notifyCommandComplete();
+ });
+
+ NetworkCliClient client(
+ grpc::CreateChannel("localhost:" + std::to_string(FLAGS_port),
--- End diff --
Add two more whitespace indentations.
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