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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
//
// 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 server to receive EchoRequest and send back EchoResponse.
#include <google/protobuf/descriptor.h>
#include <gflags/gflags.h>
#include <butil/logging.h>
#include <brpc/server.h>
#include <brpc/nshead_pb_service_adaptor.h>
#include "echo.pb.h"
DEFINE_int32(port, 8010, "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'");
// Your implementation of example::EchoService
namespace example {
class EchoServiceImpl : public EchoService {
public:
EchoServiceImpl() {};
virtual ~EchoServiceImpl() {};
virtual void Echo(google::protobuf::RpcController*,
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);
// Echo response.
response->set_message(request->message());
}
};
} // namespace example
// Adapt your own nshead-based protocol to use pbrpc interface
class MyNsheadProtocol : public brpc::NsheadPbServiceAdaptor {
public:
void ParseNsheadMeta(
const brpc::Server&, const brpc::NsheadMessage&,
brpc::Controller*,
brpc::NsheadMeta* out_meta) const {
// Always use EchoService::Echo
const google::protobuf::ServiceDescriptor* svc =
example::EchoService::descriptor();
out_meta->set_full_method_name(svc->method(0)->full_name());
}
void ParseRequestFromIOBuf(const brpc::NsheadMeta&,
const brpc::NsheadMessage& raw_req,
brpc::Controller* cntl,
google::protobuf::Message* pb_req) const {
// `req' MUST be EchoRequest here since we have only one RPCMethod
example::EchoRequest* echo_req =
dynamic_cast<example::EchoRequest*>(pb_req);
if (!echo_req) {
cntl->SetFailed(brpc::EREQUEST, "Fail to parse request");
return;
}
echo_req->set_message(raw_req.body.to_string());
}
void SerializeResponseToIOBuf(
const brpc::NsheadMeta&, brpc::Controller* cntl,
const google::protobuf::Message* pb_res,
brpc::NsheadMessage* raw_res) const {
if (cntl->Failed()) {
// Can't send failure feedback in this protocol
cntl->CloseConnection("Close connection due to previous error");
return;
}
// `res' MUST be EchoResponse here since we have only one RPCMethod
const example::EchoResponse* echo_res =
dynamic_cast<const example::EchoResponse*>(pb_res);
if (!echo_res) {
cntl->CloseConnection("Close connection due to bad response");
return;
}
raw_res->body.append(echo_res->message());
}
};
int main(int argc, char* argv[]) {
// Parse gflags. We recommend you to use gflags as well.
GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
brpc::Server server;
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
// 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.
brpc::ServerOptions options;
options.nshead_service = new MyNsheadProtocol; // the adaptor
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.
server.RunUntilAskedToQuit();
return 0;
}