| /* |
| * |
| * 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 <memory> |
| #include <mutex> |
| #include <thread> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/time.h> |
| #include <grpcpp/channel.h> |
| #include <grpcpp/client_context.h> |
| #include <grpcpp/create_channel.h> |
| #include <grpcpp/server.h> |
| #include <grpcpp/server_builder.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(size_t num_servers, |
| std::vector<int> ports = std::vector<int>()) { |
| for (size_t i = 0; i < num_servers; ++i) { |
| int port = 0; |
| if (ports.size() == num_servers) port = ports[i]; |
| servers_.emplace_back(new ServerData(server_host_, port)); |
| } |
| } |
| |
| 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, bool expect_ok = true) { |
| 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); |
| if (expect_ok) { |
| EXPECT_TRUE(status.ok()); |
| EXPECT_EQ(response.message(), request.message()); |
| } else { |
| EXPECT_FALSE(status.ok()); |
| } |
| } |
| } |
| |
| struct ServerData { |
| int port_; |
| std::unique_ptr<Server> server_; |
| MyTestServiceImpl service_; |
| |
| explicit ServerData(const grpc::string& server_host, int port = 0) { |
| port_ = port > 0 ? 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()); |
| } |
| |
| TEST_F(RoundRobinEnd2endTest, RoundRobinReconnect) { |
| // Start servers and send one RPC per server. |
| const int kNumServers = 1; |
| std::vector<int> ports; |
| ports.push_back(grpc_pick_unused_port_or_die()); |
| StartServers(kNumServers, ports); |
| 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()); |
| |
| // Kill all servers |
| for (size_t i = 0; i < servers_.size(); ++i) { |
| servers_[i]->Shutdown(); |
| } |
| // Client request should fail. |
| SendRpc(1, false); |
| |
| // Bring servers back up on the same port (we aren't recreating the channel). |
| StartServers(kNumServers, ports); |
| |
| // Client request should succeed. |
| SendRpc(1); |
| } |
| |
| } // namespace |
| } // namespace testing |
| } // namespace grpc |
| |
| int main(int argc, char** argv) { |
| grpc_test_init(argc, argv); |
| ::testing::InitGoogleTest(&argc, argv); |
| return RUN_ALL_TESTS(); |
| } |