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Diffstat (limited to 'test/cpp/end2end/round_robin_end2end_test.cc')
-rw-r--r-- | test/cpp/end2end/round_robin_end2end_test.cc | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/test/cpp/end2end/round_robin_end2end_test.cc b/test/cpp/end2end/round_robin_end2end_test.cc new file mode 100644 index 0000000000..cc340b96b3 --- /dev/null +++ b/test/cpp/end2end/round_robin_end2end_test.cc @@ -0,0 +1,216 @@ +/* + * + * 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(); +} |