| // 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) { |
| CLOGI(cntl) << "I'm about to call myself for another time, depth=" << request->depth(); |
| example::EchoService_Stub stub(&channel); |
| example::EchoRequest request2; |
| example::EchoResponse response2; |
| brpc::Controller cntl2(cntl->inheritable()); |
| request2.set_message(request->message()); |
| request2.set_depth(request->depth() - 1); |
| |
| cntl2.set_timeout_ms(FLAGS_timeout_ms); |
| cntl2.set_max_retry(FLAGS_max_retry); |
| stub.Echo(&cntl2, &request2, &response2, NULL); |
| if (cntl2.Failed()) { |
| CLOGE(&cntl2) << "Fail to send EchoRequest, " << cntl2.ErrorText(); |
| cntl->SetFailed(cntl2.ErrorCode(), "%s", cntl2.ErrorText().c_str()); |
| return; |
| } |
| response->set_message(response2.message()); |
| } else { |
| CLOGI(cntl) << "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; |
| } |