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// 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
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
// A server to receive EchoRequest and send back EchoResponse.
#include <gflags/gflags.h>
#include <butil/logging.h>
#include <brpc/server.h>
#include "echo.pb.h"
DEFINE_bool(echo_attachment, true, "Echo attachment as well");
DEFINE_int32(port, 8000, "TCP Port of this server");
DEFINE_int32(idle_timeout_s, -1, "Connection will be closed if there is no "
"read/write operations during the last `idle_timeout_s'");
DEFINE_int32(logoff_ms, 2000, "Maximum duration of server's LOGOFF state "
"(waiting for client to close connection before server stops)");
// Your implementation of example::EchoService
// Notice that implementing brpc::Describable grants the ability to put
// additional information in /status.
namespace example {
class EchoServiceImpl : public EchoService {
EchoServiceImpl() {};
virtual ~EchoServiceImpl() {};
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 =
// The purpose of following logs is to help you to understand
// how clients interact with servers more intuitively. You should
// remove these logs in performance-sensitive servers.
LOG(INFO) << "Received request[log_id=" << cntl->log_id()
<< "] from " << cntl->remote_side()
<< " to " << cntl->local_side()
<< ": " << request->message()
<< " (attached=" << cntl->request_attachment() << ")";
// Fill response.
// You can compress the response by setting Controller, but be aware
// that compression may be costly, evaluate before turning on.
// cntl->set_response_compress_type(brpc::COMPRESS_TYPE_GZIP);
if (FLAGS_echo_attachment) {
// Set attachment which is wired to network directly instead of
// being serialized into protobuf messages.
} // namespace example
int main(int argc, char* argv[]) {
// Parse gflags. We recommend you to use gflags as well.
GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
// Generally you only need one Server.
brpc::Server server;
// Instance of your service.
example::EchoServiceImpl 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
if (server.AddService(&echo_service_impl,
LOG(ERROR) << "Fail to add service";
return -1;
// Start the server.
brpc::ServerOptions options;
options.idle_timeout_sec = FLAGS_idle_timeout_s;
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.
return 0;