| /* |
| * |
| * 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/time.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" |
| |
| #include <gtest/gtest.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_; |
| |
| 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::ostringstream server_address; |
| server_address << server_host << ":" << port_; |
| ServerBuilder builder; |
| builder.AddListeningPort(server_address.str(), |
| InsecureServerCredentials()); |
| builder.RegisterService(&service_); |
| server_ = builder.BuildAndStart(); |
| gpr_log(GPR_INFO, "server startup complete"); |
| } |
| |
| void Shutdown() { server_->Shutdown(); } |
| }; |
| |
| const grpc::string server_host_; |
| 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 */); |
| // Send one RPC per backend and make sure they are used in order. |
| // Note: This relies on the fact that the subchannels are reported in |
| // state READY in the order in which the addresses are specified, |
| // which is only true because the backends are all local. |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| SendRpc(1); |
| EXPECT_EQ(1, servers_[i]->service_.request_count()) << "for backend #" << i; |
| } |
| // 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(); |
| } |