学习brpc：echo服务

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Echo同步客户端

server 端

#include <gflags/gflags.h>
#include <json2pb/pb_to_json.h>
#include <brpc/server.h>
#include "butil/endpoint.h"
#include "echo.pb.h"// flags，用于配置server
DEFINE_bool(echo_attachment, true, "Echo attachment as well");
DEFINE_int32(port, 8000, "TCP Port of this server");
DEFINE_string(listen_addr, "", "Server listen address, may be IPV4/IPV6/UDS."" If this is set, the flag port will be ignored");
DEFINE_int32(idle_timeout_s, -1, "Connection will be closed if there is no ""read/write operations during the last `idle_timeout_s'");class EchoServiceImpl : public example::EchoService {
public:EchoServiceImpl() = default;virtual ~EchoServiceImpl() = default;// response完成后执行的回调static void CallAfterRpc(brpc::Controller* controller, const google::protobuf::Message* req, const google::protobuf::Message* res) {std::string req_str, res_str;// 此时cntl/req/res均没有被析构json2pb::ProtoMessageToJson(*req, &req_str, NULL);json2pb::ProtoMessageToJson(*res, &res_str, NULL);LOG(INFO) << "Got "<< "req:" << req_str<< "and res:" << res_str;
}void Echo (google::protobuf::RpcController* controller,const example::EchoRequest* request,example::EchoResponse* response,google::protobuf::Closure* done) override {brpc::Controller* cntl = static_cast<brpc::Controller*>(controller); // 强转brpc::ClosureGuard done_guard(done); // RAII//日志LOG(INFO) << "Received request[log_id=" << cntl->log_id() << "] from " << cntl->remote_side() << " to " << cntl->local_side()<< ": " << request->message()<< " (attached=" << cntl->request_attachment() << ")";// 生成响应response->set_message("Echo: " + request->message());// 如果有捎带数据，也发送回去if(FLAGS_echo_attachment) {cntl->response_attachment().append(cntl->request_attachment());}// 设置response完成后的回调函数cntl->set_after_rpc_resp_fn(std::bind(EchoServiceImpl::CallAfterRpc,std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));}};int main(int argc, char* argv[]) {// 初始化gflagsGFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);brpc::Server server;EchoServiceImpl service_impl; // 添加服务,,brpc::SERVER_OWNS_SERVICE 表示server是否拥有 service_impl，通常为false    if(server.AddService(&service_impl, brpc::SERVER_OWNS_SERVICE) != 0) {LOG(ERROR) << "Fail to add service";return -1;}// 监听节点, 默认监听所有地址butil::EndPoint point;if(FLAGS_listen_addr.empty()) {point = butil::EndPoint(butil::IP_ANY, FLAGS_port);} else {// 解析监听地址if(butil::str2endpoint(FLAGS_listen_addr.c_str(), &point) != 0) {LOG(ERROR) << "Invalid listen address:" << FLAGS_listen_addr;return -1;}}// 设置配置brpc::ServerOptions options;    options.idle_timeout_sec = FLAGS_idle_timeout_s; // 开启server（异步的）if(server.Start(point, &options) != 0) {LOG(ERROR) << "Fail to start EchoServer";return -1;}// 等待直到退出server.RunUntilAskedToQuit(); return 0;}

client 端

#include <cstdio>
#include <gflags/gflags.h>
#include <butil/logging.h>
#include <butil/time.h>
#include <brpc/channel.h>
#include "echo.pb.h"DEFINE_string(attachment, "attach", "Carry this along with requests");
DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
DEFINE_string(load_balancer, "", "The algorithm for load balancing");
DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)"); 
DEFINE_int32(interval_ms, 1000, "Milliseconds between consecutive requests");int main(int argc, char* argv[]) {GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);// 配置brpc::ChannelOptions options;options.protocol = FLAGS_protocol;options.connection_type = FLAGS_connection_type;options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;options.max_retry = FLAGS_max_retry;// 初始化channelbrpc::Channel channel;if((channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options)) != 0) {LOG(ERROR) << "Fail to initialize channel";return -1;}// channel的封装类，线程间共享example::EchoService_Stub stub(&channel); // 准备请求响应example::EchoRequest request;example::EchoResponse response;brpc::Controller cntl; char buf[128];printf("请输入:");scanf("%s",buf);request.set_message(buf);// 捎带数据cntl.request_attachment().append(FLAGS_attachment);// Cluster 设置为空，表示同步执行，函数会阻塞，直到结果返回，或者超时stub.Echo(&cntl, &request, &response, NULL);if(cntl.Failed()) {LOG(WARNING) << cntl.ErrorText(); // 通常这只是WARNING，为了演示才直接返回return -1;}// 正确输出LOG(INFO) << "Received response from " << cntl.remote_side()<< " to " << cntl.local_side()<< ": " << response.message() << " (attached="<< cntl.response_attachment() << ")"<< " latency=" << cntl.latency_us() << "us";}

Echo 异步客户端

server端代码与同步端端server一致。

client端

#include <cstdio>
#include <gflags/gflags.h>
#include <butil/logging.h>
#include <butil/time.h>
#include <brpc/channel.h>
#include <google/protobuf/stubs/callback.h>
#include "brpc/callback.h"
#include "bthread/bthread.h"
#include "echo.pb.h"DEFINE_string(attachment, "attach", "Carry this along with requests");
DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
DEFINE_string(load_balancer, "", "The algorithm for load balancing");
DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)"); 
DEFINE_int32(interval_ms, 1000, "Milliseconds between consecutive requests");void HandleResponse(brpc::Controller *cntl, example::EchoResponse* response) {// 异步调用需要自己管理cntl 和 response 的生命周期？！// 不应该管理// std::unique_ptr<brpc::Controller> cntl_guard(cntl);// std::unique_ptr<example::EchoResponse> response_guard(response);if(cntl->Failed()) {LOG(ERROR) << "Fail to send EchoRequest, " << cntl->ErrorText();return;}// 故意等一段时间bthread_usleep(10);// 日志LOG(INFO) << "Received response from " << cntl->remote_side()<< ": " << response->message() << " (attached="<< cntl->response_attachment() << ")"<< " latency=" << cntl->latency_us() << "us";}int main(int argc, char* argv[]) {GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);// 配置brpc::ChannelOptions options;options.protocol = FLAGS_protocol;options.connection_type = FLAGS_connection_type;options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;options.max_retry = FLAGS_max_retry;// 初始化channelbrpc::Channel channel;if((channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options)) != 0) {LOG(ERROR) << "Fail to initialize channel";return -1;}// channel的封装类，线程间共享example::EchoService_Stub stub(&channel); // 准备请求响应example::EchoRequest request;example::EchoResponse response;brpc::Controller cntl; char buf[128];printf("请输入:");scanf("%s",buf);request.set_message(buf);// 捎带数据cntl.request_attachment().append(FLAGS_attachment);// 设置异步回调函数google::protobuf::Closure* done = brpc::NewCallback(&HandleResponse, &cntl, &response);// Cluster 非空，表示异步执行，接收完消息后调用donestub.Echo(&cntl, &request, &response, done);// 继续执行while(true) {bthread_usleep(5);printf("do something\n"); // 可以看到，stub.Echo是立即返回的，不影响后续执行}}