目的:
搭配etcd的注册中心管理能知道谁能提供什么服务,并用rpc进行服务调用
封装思想:
信道管理,将不同服务主机的通信信道管理起来
封装:
1.指定的信道管理类
一个服务通常会有多个节点,每个节点都会有自己的信道类,建立信道与服务的映射关系,服务一对多信道。
2.总体的信道管理类
管理多个服务的信道管理类管理起来
tips:我们没必要将所有的服务信道都建立起来,我们得申明我们关心的服务,不关心的就可以不管理这个服务
cpp
#pragma once
#include <brpc/channel.h>
#include <string>
#include <vector>
#include <unordered_map>
#include <mutex>
#include <iostream>
#include "./logger.hpp"
namespace common{
class ServerChannel
{
public:
using ChannelPtr = std::shared_ptr<brpc::Channel>;
using Ptr = std::shared_ptr<ServerChannel>;
ServerChannel(const std::string &servername)
: _service_name(servername), _index(0)
{
}
void append(const std::string &host)
{
ChannelPtr newchannel=std::make_shared<brpc::Channel>();
brpc::ChannelOptions options;
options.connect_timeout_ms = -1; // 尝试连接时长
Default: 200 (milliseconds)
options.timeout_ms = -1; // rpc调用等待时间
// Max duration of RPC over this Channel RPC调用在信道的期间
options.protocol = "baidu_std";
options.max_retry = 3;
int ret = newchannel->Init(host.c_str(), &options);
if (ret == -1)
{
LOG_ERROR("初始化{}-{}信道失败!", _service_name, host);
return;
}
std::unique_lock<std::mutex> lock(_mutex);
_channels.push_back(newchannel);
_hosts.insert({host, newchannel});
}
// 服务器下线了一个节点,则把这个信道删除
void remove(const std::string &host)
{
std::unique_lock<std::mutex> lock(_mutex);
auto score = _hosts.find(host);
if (score == _hosts.end())
{
// 没找到
LOG_WARN("没有找到该服务中的服务为{}主机名为{}的信道", _service_name, host);
return;
}
// 找到了
ChannelPtr scoreptr = score->second;
for (auto it = _channels.begin(); it != _channels.end(); ++it)
{
if (*it == scoreptr)
{
_channels.erase(it);
break;
}
}
_hosts.erase(host);
LOG_INFO("服务为{}主机名为{}的信道已经删除", _service_name, host);
}
// 选择一个信道给这个服务
ChannelPtr choose()
{
std::unique_lock<std::mutex> lock(_mutex);
if (_channels.size() == 0)
{
LOG_INFO("该服务{}中暂时没有信道", _service_name);
return ChannelPtr();
}
int pos = _index++ % _channels.size();
return _channels[pos];
}
private:
int32_t _index;
std::mutex _mutex;
std::string _service_name;
std::vector<ChannelPtr> _channels;
// 节点与信道的位图
std::unordered_map<std::string, ChannelPtr> _hosts;
};
class ServerManager
{
public:
using Ptr = std::shared_ptr<ServerManager>;
ServerManager() {}
ServerChannel::ChannelPtr choose(const std::string &instance_name)
{
std::string servicename=instance_name;
std::unique_lock<std::mutex> lock(_mutex);
auto serversret = _servers.find(servicename);
if (serversret == _servers.end())
{
LOG_INFO("当前服务{}没有可使用的节点!", servicename);
return ServerChannel::ChannelPtr();
}
// 该服务被订阅且上线了,提供一个该服务的节点
else
{
auto score = _servers.find(servicename);
ServerChannel::Ptr serverchannal = score->second;
return serverchannal->choose();
}
}
void onlinechannel(const std::string &instance_name, const std::string &host)
{
ServerChannel::Ptr onlineserver;
std::string servicename=get_service_name(instance_name);
{
std::unique_lock<std::mutex> lock(_mutex);
auto followret = _follows.find(servicename);
if (followret == _follows.end())
{
LOG_INFO("该服务{}-{}上线了,暂时没有被订阅", servicename, host);
return;
}
// 新增该服务中的一个节点
// 当该服务未上线
auto serversret = _servers.find(servicename);
if (serversret == _servers.end())
{
// 没有找到该服务 则添加该服务
onlineserver = std::make_shared<ServerChannel>(servicename);
_servers.insert({servicename, onlineserver});
}
else
{
onlineserver = serversret->second;
}
if (!onlineserver)
{
LOG_ERROR("新增 {} 服务管理节点失败!", servicename);
return;
}
// 已经存在该服务
}
onlineserver->append(host);
LOG_DEBUG("{}-{} 服务上线新节点,进行添加管理!", servicename, host);
}
void offlinechannel(const std::string &instance_name, const std::string &host)
{
ServerChannel::Ptr onlineserver;
std::string servicename=get_service_name(instance_name);
{
std::unique_lock<std::mutex> lock(_mutex);
auto followret = _follows.find(servicename);
if (followret == _follows.end())
{
LOG_INFO("该服务{}-{}下线了,暂时没有被订阅", servicename, host);
return;
}
// 删除该服务中的一个节点
// 当该服务未上线
auto serversret = _servers.find(servicename);
if (serversret == _servers.end())
{
// 没有找到该服务
LOG_INFO("没有找到该服务", servicename);
return;
}
else
{
onlineserver = serversret->second;
}
if (!onlineserver)
{
LOG_ERROR("删除 {} 服务管理节点失败!", servicename);
return;
}
// 已经存在该服务
}
onlineserver->remove(host);
LOG_DEBUG("{}-{} 服务下线该节点", servicename, host);
}
void declared(const std::string &servername)
{
std::unique_lock<std::mutex> lock(_mutex);
_follows.insert(servername);
}
std::string get_service_name(const std::string &server_instance_name)
{
int pos=server_instance_name.find_last_of('/');
if(pos==std::string::npos)
{
return server_instance_name;
}
std::string retstring = server_instance_name.substr(0,pos);
return retstring;
}
private:
std::mutex _mutex;
// 订阅的服务 没有被订阅的服务不提供节点使用
std::unordered_set<std::string> _follows;
// 服务名称 和 该服务的信道管理器
std::unordered_map<std::string, ServerChannel::Ptr> _servers;
};
}
brpc与etcd的联合
服务端:1.构建echo服务 2.搭建RPC服务器 3.启动RPC服务器 4.在etcd上注册这个RPC服务
客户端: 1.构造RPC信道管理对象 2.再构造etcd的监控对象 3.再从RPC信道管理对象中获取提供echo服务的信道 4.发起echo业务
由于choose找的是servicename : /service/echo
而在新增服务时是 /service/echo/instance 所以在新增的回调函数中要采取截断的方法
rigistry
cpp
#include <iostream>
#include <etcd/Client.hpp>
#include <etcd/KeepAlive.hpp>
#include <etcd/Response.hpp>
#include <etcd/Value.hpp>
#include <etcd/Watcher.hpp>
#include "../common/logger.hpp"
#include "../common/etcd.hpp"
#include "../common/channel.hpp"
#include<gflags/gflags.h>
#include <functional>
#include <brpc/server.h>
#include <brpc/closure_guard.h>
#include <butil/logging.h>
#include "main.pb.cc"
DEFINE_bool(run_mode,false,"这是运行的模式默认为调试模式false");
DEFINE_string(log_file,"","发布模式下指定的文件默认为空");
DEFINE_int32(log_level,0,"调试模式下默认的等级TRACE");
DEFINE_string(Host,"http://127.0.0.1:2379","服务注册中心地址");
DEFINE_string(instance_Host,"127.0.0.1:7070","新上线服务的访问地址");
DEFINE_string(base_service,"/service","服务器监控目录");
DEFINE_string(instance_service,"/echo/instance","新上线的服务");
//一个 echo 中应该有多个 key - value ,如果定义成echo的话 只能对应一个服务的访问地址
//一个 echo 中应该有多个instance - value
DEFINE_int32(listen_post,7070,"新上线服务的访问地址");
class EchoServiceImpl:public example::EchoService
{
public:
EchoServiceImpl(){}
~EchoServiceImpl() override
{}
void Echo(google::protobuf::RpcController* controller,
const ::example::EchoRequest* request,
::example::EchoResponse* response,
::google::protobuf::Closure* done) override
{
brpc::ClosureGuard rpc_guard(done);
// ~ClosureGuard() {
//if (_done) {
//_done->Run();
//}
std::cout<<"收到了消息"<<request->message()<<std::endl;
response->set_message(request->message()+"好的,我知道了");
//_done->Run();
}
};
int main(int argc,char * argv[])
{
google::ParseCommandLineFlags(&argc, &argv, true);
init_logger(FLAGS_run_mode,FLAGS_log_file,FLAGS_log_level);
//1.启动rpc服务器 并添加服务
//2.etcd内注册该服务 以及 访问该服务的 地址
logging::LoggingSettings logger;
logger.logging_dest= logging :: LoggingDestination::LOG_TO_NONE;
logging::InitLogging(logger);
//2.创建服务器并添加业务
brpc::Server server;
EchoServiceImpl echosservice;
int n=server.AddService(&echosservice,brpc::ServiceOwnership::SERVER_DOESNT_OWN_SERVICE);
if(n<0)
{
std::cout<<"AddService error"<<std::endl;
exit(0);
}
//函数不匹配,源码有可能设置的是指针类型,tips
//3.设置服务器选项,并且启动服务器
brpc::ServerOptions opt;
opt.idle_timeout_sec=-1;//尝试连接时间 超时则退出
opt.num_threads=1;//number of pthreads that server runs on. 单线程
; //number of requests processed in parallel(并行)// Default: 0 (unlimited)
int m=server.Start(FLAGS_listen_post,&opt);
if(m<0)
{
std::cout<<"server Start error"<<std::endl;
exit(1);
}
Rigistry::ptr rigserver=std::make_shared<Rigistry>(FLAGS_Host);
rigserver->registry(FLAGS_base_service+FLAGS_instance_service,FLAGS_instance_Host);
//运行等待服务结束
server.RunUntilAskedToQuit();//运行等待服务结束
}
discovey
cpp
#include <iostream>
#include <etcd/Client.hpp>
#include <etcd/KeepAlive.hpp>
#include <etcd/Response.hpp>
#include <etcd/Value.hpp>
#include <etcd/Watcher.hpp>
#include "../common/logger.hpp"
#include "../common/etcd.hpp"
#include "../common/channel.hpp"
#include <gflags/gflags.h>
#include <functional>
#include <brpc/server.h>
#include <brpc/closure_guard.h>
#include <butil/logging.h>
#include "main.pb.cc"
DEFINE_bool(run_mode, false, "这是运行的模式默认为调试模式false");
DEFINE_string(log_file, "", "发布模式下指定的文件默认为空");
DEFINE_int32(log_level, 0, "调试模式下默认的等级TRACE");
DEFINE_string(Host, "http://127.0.0.1:2379", "服务注册中心地址");
DEFINE_string(instance_Host, "168.198.0.1::8080", "新上线服务的访问地址");
DEFINE_string(instance_service, "/echo", "新上线的服务");
DEFINE_string(base_dir, "/service", "新上线的服务");
DEFINE_string(call_service, "/service/echo", "新上线的服务");
int main(int argc, char *argv[])
{
google::ParseCommandLineFlags(&argc, &argv, true);
init_logger(FLAGS_run_mode, FLAGS_log_file, FLAGS_log_level);
// 1.创建服务管理类 并申明订阅的服务
ServerManager::Ptr server = std::make_shared<ServerManager>();
server->declared(FLAGS_call_service);
// 2.将两个回调函数绑定,创建发现对象
auto onlineput = std::bind(&ServerManager::onlinechannel, (server.get()), std::placeholders::_1, std::placeholders::_2);
auto offlineput = std::bind(&ServerManager::offlinechannel, (server.get()), std::placeholders::_1, std::placeholders::_2);
// 3.发现对象发现该服务,创建Echo_Servicestub
Discovery::ptr Disserver = std::make_shared<Discovery>(FLAGS_Host, FLAGS_base_dir, onlineput, offlineput);
while (1)
{
auto channel = server->choose(FLAGS_call_service);
if (!channel)
{
std::this_thread::sleep_for(std::chrono::seconds(1));
return -1;
}
example::EchoService_Stub echoServiceStub(channel.get());
brpc::Controller *control = new brpc::Controller();
control->Reset();
example::EchoRequest request1;
request1.set_message("你好啊少年");
example::EchoResponse *response1 = new example::EchoResponse();
// 4.Echo_Servicestub调用Echo服务
// rpc业务调用
echoServiceStub.Echo(control, &request1, response1, nullptr);
if (control->Failed())
{
std::cout << "rpc echo service failed" << control->ErrorText() << std::endl;
delete control;
delete response1;
std::this_thread::sleep_for(std::chrono::seconds(1));
continue;
}
std::cout << "client收到响应" << response1->message() << std::endl;
std::this_thread::sleep_for(std::chrono::seconds(1));
}
return 0;
}