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+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <memory>
+#include <mutex>
+#include <thread>
+
+#include <grpc++/channel.h>
+#include <grpc++/client_context.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/time.h>
+#include <gtest/gtest.h>
+
+#include "src/proto/grpc/testing/echo.grpc.pb.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+#include "test/cpp/end2end/test_service_impl.h"
+
+using grpc::testing::EchoRequest;
+using grpc::testing::EchoResponse;
+using std::chrono::system_clock;
+
+namespace grpc {
+namespace testing {
+namespace {
+
+// Subclass of TestServiceImpl that increments a request counter for
+// every call to the Echo RPC.
+class MyTestServiceImpl : public TestServiceImpl {
+ public:
+ MyTestServiceImpl() : request_count_(0) {}
+
+ Status Echo(ServerContext* context, const EchoRequest* request,
+ EchoResponse* response) override {
+ {
+ std::unique_lock<std::mutex> lock(mu_);
+ ++request_count_;
+ }
+ return TestServiceImpl::Echo(context, request, response);
+ }
+
+ int request_count() {
+ std::unique_lock<std::mutex> lock(mu_);
+ return request_count_;
+ }
+
+ private:
+ std::mutex mu_;
+ int request_count_;
+};
+
+class RoundRobinEnd2endTest : public ::testing::Test {
+ protected:
+ RoundRobinEnd2endTest() : server_host_("localhost") {}
+
+ void StartServers(int num_servers) {
+ for (int i = 0; i < num_servers; ++i) {
+ servers_.emplace_back(new ServerData(server_host_));
+ }
+ }
+
+ void TearDown() override {
+ for (size_t i = 0; i < servers_.size(); ++i) {
+ servers_[i]->Shutdown();
+ }
+ }
+
+ void ResetStub(bool round_robin) {
+ ChannelArguments args;
+ if (round_robin) args.SetLoadBalancingPolicyName("round_robin");
+ std::ostringstream uri;
+ uri << "ipv4:///";
+ for (size_t i = 0; i < servers_.size() - 1; ++i) {
+ uri << "127.0.0.1:" << servers_[i]->port_ << ",";
+ }
+ uri << "127.0.0.1:" << servers_[servers_.size() - 1]->port_;
+ channel_ =
+ CreateCustomChannel(uri.str(), InsecureChannelCredentials(), args);
+ stub_ = grpc::testing::EchoTestService::NewStub(channel_);
+ }
+
+ void SendRpc(int num_rpcs) {
+ EchoRequest request;
+ EchoResponse response;
+ request.set_message("Live long and prosper.");
+ for (int i = 0; i < num_rpcs; i++) {
+ ClientContext context;
+ Status status = stub_->Echo(&context, request, &response);
+ EXPECT_TRUE(status.ok());
+ EXPECT_EQ(response.message(), request.message());
+ }
+ }
+
+ struct ServerData {
+ int port_;
+ std::unique_ptr<Server> server_;
+ MyTestServiceImpl service_;
+ std::unique_ptr<std::thread> thread_;
+
+ explicit ServerData(const grpc::string& server_host) {
+ port_ = grpc_pick_unused_port_or_die();
+ gpr_log(GPR_INFO, "starting server on port %d", port_);
+ std::mutex mu;
+ std::condition_variable cond;
+ thread_.reset(new std::thread(
+ std::bind(&ServerData::Start, this, server_host, &mu, &cond)));
+ std::unique_lock<std::mutex> lock(mu);
+ cond.wait(lock);
+ gpr_log(GPR_INFO, "server startup complete");
+ }
+
+ void Start(const grpc::string& server_host, std::mutex* mu,
+ std::condition_variable* cond) {
+ std::ostringstream server_address;
+ server_address << server_host << ":" << port_;
+ ServerBuilder builder;
+ builder.AddListeningPort(server_address.str(),
+ InsecureServerCredentials());
+ builder.RegisterService(&service_);
+ server_ = builder.BuildAndStart();
+ std::lock_guard<std::mutex> lock(*mu);
+ cond->notify_one();
+ }
+
+ void Shutdown() {
+ server_->Shutdown();
+ thread_->join();
+ }
+ };
+
+ const grpc::string server_host_;
+ CompletionQueue cli_cq_;
+ std::shared_ptr<Channel> channel_;
+ std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
+ std::vector<std::unique_ptr<ServerData>> servers_;
+};
+
+TEST_F(RoundRobinEnd2endTest, PickFirst) {
+ // Start servers and send one RPC per server.
+ const int kNumServers = 3;
+ StartServers(kNumServers);
+ ResetStub(false /* round_robin */);
+ SendRpc(kNumServers);
+ // All requests should have gone to a single server.
+ bool found = false;
+ for (size_t i = 0; i < servers_.size(); ++i) {
+ const int request_count = servers_[i]->service_.request_count();
+ if (request_count == kNumServers) {
+ found = true;
+ } else {
+ EXPECT_EQ(0, request_count);
+ }
+ }
+ EXPECT_TRUE(found);
+ // Check LB policy name for the channel.
+ EXPECT_EQ("pick_first", channel_->GetLoadBalancingPolicyName());
+}
+
+TEST_F(RoundRobinEnd2endTest, RoundRobin) {
+ // Start servers and send one RPC per server.
+ const int kNumServers = 3;
+ StartServers(kNumServers);
+ ResetStub(true /* round_robin */);
+ SendRpc(kNumServers);
+ // One request should have gone to each server.
+ for (size_t i = 0; i < servers_.size(); ++i) {
+ EXPECT_EQ(1, servers_[i]->service_.request_count());
+ }
+ // Check LB policy name for the channel.
+ EXPECT_EQ("round_robin", channel_->GetLoadBalancingPolicyName());
+}
+
+} // namespace
+} // namespace testing
+} // namespace grpc
+
+int main(int argc, char** argv) {
+ grpc_test_init(argc, argv);
+ ::testing::InitGoogleTest(&argc, argv);
+ return RUN_ALL_TESTS();
+}