// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you 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 every 1 second. #include <gflags/gflags.h> #include <butil/logging.h> #include <butil/time.h> #include <butil/strings/string_piece.h> #include <brpc/channel.h> #include <brpc/nshead_message.h> #include <bvar/bvar.h> bvar::LatencyRecorder g_latency_recorder("client"); DEFINE_string(server, "0.0.0.0:8010", "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)"); 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 = brpc::PROTOCOL_NSHEAD; 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; } // Send a request and wait for the response every 1 second. int log_id = 0; while (!brpc::IsAskedToQuit()) { brpc::NsheadMessage request; brpc::NsheadMessage response; brpc::Controller cntl; // Append message to `request' request.body.append("hello world"); cntl.set_log_id(log_id ++); // set by user // Because `done'(last parameter) is NULL, this function waits until // the response comes back or error occurs(including timedout). channel.CallMethod(NULL, &cntl, &request, &response, NULL); if (cntl.Failed()) { LOG(ERROR) << "Fail to send nshead request, " << cntl.ErrorText(); sleep(1); // Remove this sleep in production code. } else { g_latency_recorder << cntl.latency_us(); } LOG_EVERY_SECOND(INFO) << "Sending nshead requests at qps=" << g_latency_recorder.qps(1) << " latency=" << g_latency_recorder.latency(1); } LOG(INFO) << "EchoClient is going to quit"; return 0; }