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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.
- #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;
- }
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