/* * * Copyright 2016 gRPC authors. * * Licensed 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 #include #include #include #include #include #include #include #include #include #include #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 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 lock(mu_); ++request_count_; } return TestServiceImpl::Echo(context, request, response); } int request_count() { std::unique_lock 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_; 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_; std::unique_ptr stub_; std::vector> 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(); }