// Copyright (c) 2014 Baidu, Inc. // // 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. // A client sending requests to server by multiple threads. #include <gflags/gflags.h> #include <bthread/bthread.h> #include <butil/logging.h> #include <brpc/channel.h> #include "echo.pb.h" #include <bvar/bvar.h> DEFINE_int32(thread_num, 50, "Number of threads to send requests"); DEFINE_bool(use_bthread, false, "Use bthread to send requests"); DEFINE_int32(attachment_size, 0, "Carry so many byte attachment along with requests"); DEFINE_int32(request_size, 16, "Bytes of each request"); DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto"); DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short"); DEFINE_string(server, "0.0.0.0:8002", "IP Address of server"); DEFINE_string(load_balancer, "", "The algorithm for load balancing"); DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds"); DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)"); DEFINE_bool(dont_fail, false, "Print fatal when some call failed"); std::string g_request; std::string g_attachment; bvar::LatencyRecorder g_latency_recorder("client"); static void* sender(void* arg) { // Normally, you should not call a Channel directly, but instead construct // a stub Service wrapping it. stub can be shared by all threads as well. example::EchoService_Stub stub(static_cast<google::protobuf::RpcChannel*>(arg)); int log_id = 0; while (!brpc::IsAskedToQuit()) { // We will receive response synchronously, safe to put variables // on stack. example::EchoRequest request; example::EchoResponse response; brpc::Controller cntl; request.set_message(g_request); cntl.set_log_id(log_id++); // set by user if (!g_attachment.empty()) { // Set attachment which is wired to network directly instead of // being serialized into protobuf messages. cntl.request_attachment().append(g_attachment); } // Because `done'(last parameter) is NULL, this function waits until // the response comes back or error occurs(including timedout). const int64_t start_time = butil::cpuwide_time_us(); stub.Echo(&cntl, &request, &response, NULL); const int64_t end_time = butil::cpuwide_time_us(); const int64_t elp = end_time - start_time; if (!cntl.Failed()) { g_latency_recorder << elp; } else { CHECK(brpc::IsAskedToQuit() || !FLAGS_dont_fail) << "error=" << cntl.ErrorText() << " latency=" << elp; // We can't connect to the server, sleep a while. Notice that this // is a specific sleeping to prevent this thread from spinning too // fast. You should continue the business logic in a production // server rather than sleeping. bthread_usleep(50000); } } return NULL; } int main(int argc, char* argv[]) { // Parse gflags. We recommend you to use gflags as well. GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true); // A Channel represents a communication line to a Server. Notice that // Channel is thread-safe and can be shared by all threads in your program. brpc::Channel channel; // Initialize the channel, NULL means using default options. brpc::ChannelOptions options; options.protocol = FLAGS_protocol; options.connection_type = FLAGS_connection_type; options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/; options.max_retry = FLAGS_max_retry; if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options) != 0) { LOG(ERROR) << "Fail to initialize channel"; return -1; } if (FLAGS_attachment_size > 0) { g_attachment.resize(FLAGS_attachment_size, 'a'); } if (FLAGS_request_size <= 0) { LOG(ERROR) << "Bad request_size=" << FLAGS_request_size; return -1; } g_request.resize(FLAGS_request_size, 'r'); std::vector<bthread_t> tids; tids.resize(FLAGS_thread_num); if (!FLAGS_use_bthread) { for (int i = 0; i < FLAGS_thread_num; ++i) { if (pthread_create(&tids[i], NULL, sender, &channel) != 0) { LOG(ERROR) << "Fail to create pthread"; return -1; } } } else { for (int i = 0; i < FLAGS_thread_num; ++i) { if (bthread_start_background( &tids[i], NULL, sender, &channel) != 0) { LOG(ERROR) << "Fail to create bthread"; return -1; } } } while (!brpc::IsAskedToQuit()) { sleep(1); LOG(INFO) << "Sending EchoRequest at qps=" << g_latency_recorder.qps(1) << " latency=" << g_latency_recorder.latency(1); } LOG(INFO) << "EchoClient is going to quit"; for (int i = 0; i < FLAGS_thread_num; ++i) { if (!FLAGS_use_bthread) { pthread_join(tids[i], NULL); } else { bthread_join(tids[i], NULL); } } return 0; }