// 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. #include <gflags/gflags.h> #include <butil/logging.h> #include <brpc/channel.h> #include <brpc/server.h> #include "echo.pb.h" DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds"); DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)"); DEFINE_bool(echo_attachment, true, "Echo attachment as well"); DEFINE_int32(port, 8000, "TCP Port of this server"); DEFINE_string(server, "", "The server to connect, localhost:FLAGS_port as default"); DEFINE_string(load_balancer, "", "The algorithm for load balancing"); DEFINE_bool(use_http, false, "Use http protocol to transfer messages"); DEFINE_int32(idle_timeout_s, -1, "Connection will be closed if there is no " "read/write operations during the last `idle_timeout_s'"); brpc::Channel channel; // Your implementation of example::EchoService namespace example { class CascadeEchoService : public EchoService { public: CascadeEchoService() {}; virtual ~CascadeEchoService() {}; virtual void Echo(google::protobuf::RpcController* cntl_base, const EchoRequest* request, EchoResponse* response, google::protobuf::Closure* done) { // This object helps you to call done->Run() in RAII style. If you need // to process the request asynchronously, pass done_guard.release(). brpc::ClosureGuard done_guard(done); brpc::Controller* cntl = static_cast<brpc::Controller*>(cntl_base); if (request->depth() > 0) { TRACEPRINTF("I'm about to call myself for another time, depth=%d", request->depth()); example::EchoService_Stub stub(&channel); example::EchoRequest request2; example::EchoResponse response2; brpc::Controller cntl2; request2.set_message(request->message()); request2.set_depth(request->depth() - 1); cntl2.set_log_id(cntl->log_id()); cntl2.set_timeout_ms(FLAGS_timeout_ms); cntl2.set_max_retry(FLAGS_max_retry); stub.Echo(&cntl2, &request2, &response2, NULL); if (cntl2.Failed()) { LOG(ERROR) << "Fail to send EchoRequest, " << cntl2.ErrorText(); cntl->SetFailed(cntl2.ErrorCode(), "%s", cntl2.ErrorText().c_str()); return; } response->set_message(response2.message()); } else { TRACEPRINTF("I'm the last call"); response->set_message(request->message()); } if (FLAGS_echo_attachment && !FLAGS_use_http) { // Set attachment which is wired to network directly instead of // being serialized into protobuf messages. cntl->response_attachment().append(cntl->request_attachment()); } } }; } // namespace example int main(int argc, char* argv[]) { // Parse gflags. We recommend you to use gflags as well. GFLAGS_NS::SetUsageMessage("A server that may call itself"); 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::ChannelOptions coption; if (FLAGS_use_http) { coption.protocol = brpc::PROTOCOL_HTTP; } // Initialize the channel, NULL means using default options. // options, see `brpc/channel.h'. if (FLAGS_server.empty()) { if (channel.Init("localhost", FLAGS_port, &coption) != 0) { LOG(ERROR) << "Fail to initialize channel"; return -1; } } else { if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &coption) != 0) { LOG(ERROR) << "Fail to initialize channel"; return -1; } } // Generally you only need one Server. brpc::Server server; // For more options see `brpc/server.h'. brpc::ServerOptions options; options.idle_timeout_sec = FLAGS_idle_timeout_s; // Instance of your service. example::CascadeEchoService echo_service_impl; // Add the service into server. Notice the second parameter, because the // service is put on stack, we don't want server to delete it, otherwise // use brpc::SERVER_OWNS_SERVICE. if (server.AddService(&echo_service_impl, brpc::SERVER_DOESNT_OWN_SERVICE) != 0) { LOG(ERROR) << "Fail to add service"; return -1; } // Start the server. if (server.Start(FLAGS_port, &options) != 0) { LOG(ERROR) << "Fail to start EchoServer"; return -1; } // Wait until Ctrl-C is pressed, then Stop() and Join() the server. server.RunUntilAskedToQuit(); return 0; }