63 epoll服务器 (ET模式)

基于LT模式修改，并加入前面的应用层计算器，实现稍完整的服务器功能
1.修改tcp_socket.hpp，新增非阻塞读和非阻塞写接口
2.对于accept返回的new_sock加上EPOLLET这样的选项

注意：此代码暂时未考虑listen_sock ET的情况，如果将listen_sock设为ET，则需要非阻塞轮询的方式accept，否则会导致同一时刻大量的客户端同时连接的情况，只能accept一次的问题

目录

1. 整体结构
2. 流程
3. 运行示例
4. 全
5. 改进
6. Reactor的理论

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1. 整体结构

TpcServer服务器类，维护_listen套接字，用来获取连接和监听读写事件，map用套接字做键值，rev数组作为epoll_wait的输出参数

每一个连接都是一个session结构，包含读写缓冲区，ip和端口方便调试，读写错误的回调处理函数，指针回指服务器

nocopy类用来给某些类提供无法拷贝的功能
socket类，提供套接字的创建，监听等功能
协议类和计算类为前面章节的内容，用来对收到的数据处理返回结果
Epoll类提供epoll多路转接功能
comm类单独拎出来的设置非阻塞功能，因为很多地方都要用到

2. 流程

服务端

TpcServer.hpp
继承enable_shared_from_this类可以解决智能指针不能用this构造的问题，使用智能指针对象需要用shared_from_this()功能来获取

定义两个函数模板，构造时传入报文处理回调

Init函数初始化套接字，设置非阻塞，AddConnection函数添加listen套接字到关注事件中，绑定事件分配函数Accepter

AddConnection函数参数传入要设置的套接字，事件，三个函数，ip和端口用来调试

Connection
构造时传入sock初始化成员变量

作为连接管理类，需要管理每个连接的发送和接收缓冲区，所以提供存入缓冲区数据的和返回缓冲区内容的功能，再提供初始化自己成员函数的功能

TpcServer.hpp
继续说明AddConnection函数，这个函数的作用为每个连接初始化session，添加关注事件和管理，后面每个新链接都要用这个函数

构造一个Connection的临时对象
设置成员TpcServer和回调函数，ip和port
添加对象到map结构里，添加listen的事件，listen关注读

Accpeter连接管理器函数，参数是事件就绪的会话

不一定只有一个连接到来，所以需要循环读取。用accept获取就绪连接，设置非阻塞后，调用AddConnection函数加入会话管理，作为连接会话三个回调函数分别是读写错误

当错误码是EWOULDBLOCK的时候，说明已经获取完，退出循环，EINTR表示系统调用被信号中断，所以继续读取，其他情况退出

Recver数据读取函数，用来提供读取数据添加到Connection缓冲区的功能

首先判断了连接的生命周期，如果消亡就退出。通过lock获取一个shared指针对象。
因为是ET模式，所以一次性需要读完所有数据，用recv函数，返回值n大于0表示读取到数据，添加到接收缓冲区中，等于0对方客户度退出，调用错误处理函数，小于0和上面一样判断是否读完，不是就走错误处理

最后将读取到的数据交给处理函数，所有报文情况都由它处理

Sender函数，获取连接的发送缓冲区发送，一次性将数据都发送，返回值大于0发送成功，将发送了的内容删除，判断如果发送缓冲区为空就退出。0表示没发送任何内容也退出，其他情况判断是否走错误处理

epoll/select/poll，因为写事件经常都是就绪的，发送缓冲区基本会有空间，如果设置了写关心，每次都会就绪，经常返回浪费cpu资源。所以对于读，需要设置常关心，写，按需求设置
当发送完后，检查缓冲区不为空，没发送完就对写事件开启关心，发送完将事件关闭

EnableEvent函数，设置套接字的读和写，根据传入的参数，判断有没有读和写，通过三木运算符，有就加入event，最后修改套接字的事件

Excepter函数，错误处理函数，遇到错误就是关闭这个链接。如果连接在读和写时发生错误，用这个函数。取消这个套接字的所有关心，关闭文件，map中移除

IsSafeConnection函数，检查链接是否合法，遍历map，是否存在

主逻辑
Loop函数，服务器的运行循环，传入超时时间，不断调用事件分配函数和打印连接函数

PrintConnection函数，打印出map中所有的fd，用来调试

Dispatcher函数，timeout等待时间是上一个函数传入。不断wait监听revs数组添加了的套接字，n会返回就绪的个数，取到套接字和事件，将异常转为读写统一处理。如果是读事件就绪，并且连接合法，就调用读取函数，写事件调用写函数

TpcServer.cc
全局的计算类对象，DefaultOnMessage函数是默认的报文处理函数，对报文的完整性判断，计算返回结果并发送
调用计算类的函数，判断返回的字符串是否为空，为空说明报文不完整或有错误。如果处理完成，将结果加入到发送缓冲区，用tcpserver对象发送

main函数创建svr对象，传入报文处理函数，启动服务器

客户端

客户端链接服务器，生成5个随机报文发送接收结果打印
是前面章节的网络计算器
网络计算器

3. 运行示例

4. 全

TcpServer.hpp

#pragma ocne
#include <iostream>
#include <memory>
#include <functional>
#include <unordered_map>
#include "Comm.hpp"
#include "log.hpp"
#include "Epoll.hpp"
#include "Socket.hpp"class Connection;
class TpcServer;
using func_t = std::function<void(std::weak_ptr<Connection>)>; // 用户缓冲区处理函数模板
using except_func_t = std::function<void(std::weak_ptr<Connection>)>;
static const uint16_t port = 8000;
static const int g_buff_size = 128;
// 设置et
uint32_t EVENT_IN = (EPOLLIN | EPOLLET);
uint32_t EVENt_OUT = (EPOLLOUT | EPOLLET);class Connection
{
public:Connection(int sock){_sock = sock;}~Connection(){}void AppendInbuff(const std::string& message){_inbuff += message;}void AppendOutbuff(const std::string& message){_outbuff += message;}int Fd(){return _sock;}std::string& Inbuffer()  // for debug{return _inbuff;}std::string& Outbuffer()  // for debug{return _outbuff;}void SetHandler(func_t recv_cb, func_t send_cb, except_func_t except_cb){_recv_cb = recv_cb;_send_cb = send_cb;_except_cb = except_cb;}void SetWeakPtr(std::weak_ptr<TpcServer> tcp_setver_ptr){_tcp_server_ptr = tcp_setver_ptr;}private:int _sock;std::string _inbuff;  // string不能二进制, 需要vectorstd::string _outbuff;
public:func_t _recv_cb;func_t _send_cb;except_func_t _except_cb;std::weak_ptr<TpcServer> _tcp_server_ptr;  // 回指向服务器std::string _ip;uint16_t _port;
};class TpcServer :public std::enable_shared_from_this<TpcServer>, public nocopy
{static const int num = 64;public:TpcServer(func_t OnMessage): _listensocket_ptr(new Sock()), _epoll_ptr(new Epoll()), _OnMessage(OnMessage), _quit(true){}void AddConnection(int sock, uint32_t event, func_t recv_cb, func_t send_cb, \except_func_t except_cb, const std::string& ip = "0.0.0.0", uint16_t port = 0){// 1. 给sock创建connection对象, 将lstensock添加到connection中// 同时,listeinsock和connection放入_connectionsstd::shared_ptr<Connection> new_con(new Connection(sock));new_con->SetWeakPtr(shared_from_this());  // 返回当前对象的shared_ptrnew_con->SetHandler(recv_cb, send_cb, except_cb);new_con->_ip = ip;new_con->_port = port;// 2. 添加到map_connections.insert(std::make_pair(sock, new_con));// 3. 添加对应事件_epoll_ptr->EpollUpdate(EPOLL_CTL_ADD, sock, event);}void Init(){_listensocket_ptr->Socket();int opt = 1;setsockopt(_listensocket_ptr->Fd(), SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt));// et模式需要非阻塞SetNonBlock(_listensocket_ptr->Fd());lg.logmessage(info, "listensock create success:%d", _listensocket_ptr->Fd());_listensocket_ptr->Bind(port);_listensocket_ptr->Listen();// 关联connectionAddConnection(_listensocket_ptr->Fd(), EVENT_IN,std::bind(&TpcServer::Accepter, this, std::placeholders::_1), nullptr, nullptr);}void Accepter(std::weak_ptr<Connection> con){// 获取强引用对象, 检查是否销毁auto connection = con.lock();// 获取新链接while (true){struct sockaddr_in peer;socklen_t len = sizeof(peer);// ::调用原生函数int sock = ::accept(connection->Fd(), (struct sockaddr *)&peer, &len);if (sock > 0){char ipbuf[128];inet_ntop(AF_INET, &peer.sin_addr.s_addr, ipbuf, sizeof(ipbuf));uint16_t port = ntohs(peer.sin_port);lg.logmessage(info, "get a new clinet[%s:%d]:%d", ipbuf, port, sock);// 设置非阻塞SetNonBlock(sock);// 添加连接事件AddConnection(sock, EVENT_IN,\std::bind(&TpcServer::Recver, this, std::placeholders::_1),\std::bind(&TpcServer::Sender, this, std::placeholders::_1),\std::bind(&TpcServer::Excepter, this, std::placeholders::_1),\ipbuf, port);}else {if (errno == EWOULDBLOCK){break;}else if (errno == EINTR)  // 信号中断{continue;}else{break;}}}}void Recver(std::weak_ptr<Connection> con){if (con.expired())return;auto connec = con.lock();int sock = connec->Fd();while (true){char buff[g_buff_size];memset(buff, 0, sizeof(buff));ssize_t n = recv(sock, buff, sizeof(buff) - 1, 0);  // 非阻塞读取if (n > 0){connec->AppendInbuff(buff);}else if (n == 0)  // 错误处理{lg.logmessage(info, "sockfd:%d, client[%s:%d] quit", sock, connec->_ip.c_str(), connec->_port);connec->_except_cb(connec);return;}else{if (errno == EWOULDBLOCK)  // 读完{break;}else if (errno == EINTR){continue;}else{lg.logmessage(warning, "sockfd:%d, client[%s:%d] recv error", sock, connec->_ip.c_str(), connec->_port);connec->_except_cb(connec);return;}}}// 数据有了, 不一定安全 1.检测 2.如果有完整报文,处理_OnMessage(connec);}void Sender(std::weak_ptr<Connection> con){if (con.expired())return;auto connection = con.lock();auto &outbuff = connection->Outbuffer();while (true){ssize_t n = send(connection->Fd(), outbuff.c_str(), outbuff.size(), 0);if (n > 0){outbuff.erase(0, n);if (outbuff.empty()){break;}}else if (n == 0){return;  // 没有发}else{if (errno == EWOULDBLOCK){break;}else if (errno == EINTR){continue;}else{lg.logmessage(info, "sockfd:%d, client[%s:%d] recv error", connection->Fd(), connection->_ip.c_str(), connection->_port);connection->_except_cb(connection);return;}}}// 没发完, 开启对写事件关心if (!outbuff.empty()){EnableEvent(connection->Fd(), true, true);}else{EnableEvent(connection->Fd(), true, false);}}void EnableEvent(int sock, bool readable, bool writeable){uint32_t evnet = 0;evnet |= ((readable ? EPOLLIN : 0) | (writeable ? EPOLLOUT : 0) | EPOLLET);_epoll_ptr->EpollUpdate(EPOLL_CTL_MOD, sock, evnet);}void Excepter(std::weak_ptr<Connection> con){if (con.expired())return;auto connection = con.lock();int fd = connection->Fd();lg.logmessage(warning, "Excepter handler:%d, client[%s:%d] excepter error", connection->Fd(), connection->_ip.c_str(), connection->_port);// 1. 移除关心_epoll_ptr->EpollUpdate(EPOLL_CTL_DEL, fd, 0);// 2. 关闭文件lg.logmessage(debug, "close %d...", fd);close(fd);// 3. unordered_map中移除lg.logmessage(debug, "remove connection %d", fd);_connections.erase(fd);}bool IsSafeConnection(int sock){auto it = _connections.find(sock);if (it == _connections.end()){return false;}else{return true;}  }void Dispatcher(int timeout){int n = _epoll_ptr->EpollWait(_revs, num, timeout);for (int i = 0; i < n; i++){int sock = _revs[i].data.fd;uint32_t event = _revs[i].events;// 统一将异常转换为读写问题if (event & EPOLLERR){event |= (EPOLLIN | EPOLLOUT);}if (event & EPOLLHUP){event |= (EPOLLIN | EPOLLOUT);}if ((event & EPOLLIN) && IsSafeConnection(sock)){if (_connections[sock]->_recv_cb){_connections[sock]->_recv_cb(_connections[sock]);}}if ((event & EPOLLOUT) && IsSafeConnection(sock)){if (_connections[sock]->_send_cb){_connections[sock]->_send_cb(_connections[sock]);}}}}void Loop(){_quit = false;while (!_quit){Dispatcher(3000);PrintConnection();}_quit = true;}void PrintConnection(){std::cout << "_connection list: ";for (auto &con: _connections){std::cout << con.second->Fd() << ",";}std::cout << std::endl;}private:std::shared_ptr<Sock> _listensocket_ptr;  // 监听socket, 可以移到外部std::shared_ptr<Epoll> _epoll_ptr;  // 内核std::unordered_map<int, std::shared_ptr<Connection>> _connections;struct epoll_event _revs[num];func_t _OnMessage;bool _quit;
};

TcpServer.cc

#include <memory>
#include "TpcServer.hpp"
#include "Calculator.hpp"Calculator calculator;
void DefaultOnMessage(std::weak_ptr<Connection> con)
{if(con.expired()) return;auto connection_ptr = con.lock();std::cout << connection_ptr->Inbuffer() << std::endl;std::string response_str = calculator.Handler(connection_ptr->Inbuffer());  // 业务逻辑简单,如果复杂,需要拿到结果单独线程处理if (response_str.empty()){return;}lg.logmessage(debug, "%s", response_str.c_str());connection_ptr->AppendOutbuff(response_str);//connection_ptr->_send_cb(connection_ptr); auto tcpserver = connection_ptr->_tcp_server_ptr.lock();  tcpserver->Sender(connection_ptr);
}int main()
{std::shared_ptr<TpcServer> svr(new TpcServer(DefaultOnMessage));svr->Init();svr->Loop();return 0;
}

Clinet.cc

#include <time.h>
#include <unistd.h>
#include <assert.h>
#include "Socket.hpp"
#include "Protocol.hpp"int main()
{srand(time(NULL));std::cout << "准备连接" << std::endl;uint16_t serverport = 8000;string serverip = "106.54.46.147";struct sockaddr_in server;bzero(&server, sizeof(server));server.sin_family = AF_INET;server.sin_addr.s_addr = inet_addr(serverip.c_str());server.sin_port = htons(serverport);const string opers = "+-*/%=^";Sock socket;socket.Socket();bool r = socket.Connect(serverip, serverport);if (!r)return 1;std::cout << "连接成功, 开始发送数据" << std::endl;int cnt = 1;while (cnt <= 5){std::cout << "=============第" << cnt << "次测试...." << "============" << std::endl;string package;int x = rand() % 100;int y = rand() % 100 + 1;char op = opers[rand() % opers.size()];Request req(x, y, op);req.DebugPrint();req.Serialize(&package);package = Encode(package);std::cout << package << std::endl;write(socket._sockfd, package.c_str(), package.size());char buff[1024];int n = read(socket._sockfd, buff, sizeof(buff));string inbuff_stream;if (n > 0){buff[n] = 0;inbuff_stream += buff;std::cout << inbuff_stream << std::endl;string content;bool r = Decode(inbuff_stream, &content);assert(r);Response resp;r = resp.Deserialize(content);assert(r);resp.DebugPrint();}std::cout << "=======================================" << std::endl;sleep(1);cnt++;}socket.Close();return 0;}

Comm.hpp

#pragma once
#include <fcntl.h>
#include <unistd.h>
#include "Socket.hpp"void SetNonBlock(int sock)
{int f1 = fcntl(sock, F_GETFL);if (f1 < 0){exit(NONBLOCKERR);}fcntl(sock, F_SETFL, f1 | O_NONBLOCK);
}

Epoll.hpp

#pragma once
#include <sys/epoll.h>
#include "nocopy.hpp"
#include "log.hpp"class Epoll : public nocopy
{static const int size = 128;Log log;public:Epoll(){_epfd = epoll_create(size);if (_epfd == -1){log.logmessage(ERROR, "epoll create error:%s", strerror(errno));}else{log.logmessage(info, "epoll create success:%d", _epfd);}}int EpollWait(struct epoll_event revents[], int num, int timeout){int n = epoll_wait(_epfd, revents, num, timeout);return n;}int EpollUpdate(int oper, int sock, uint32_t event){int n = 0;if (oper == EPOLL_CTL_DEL){n = epoll_ctl(_epfd, oper, sock, nullptr);if (n != 0){log.logmessage(ERROR, "epoll_ctl delete error");}}else{struct epoll_event ev;ev.events = event;ev.data.fd = sock;n = epoll_ctl(_epfd, oper, sock, &ev);if (n != 0){log.logmessage(ERROR, "epoll_ctl add error");}}}~Epoll(){if (_epfd >= 0){close(_epfd);}}private:int _epfd;int _timeout{3000};
};

nocopy.hpp

#pragma onceclass nocopy
{
public:nocopy(){}nocopy(const nocopy &) = delete;nocopy& operator=(const nocopy&) = delete;
};

Socket.hpp

#pragma once
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include "log.hpp"enum
{SOCKERR = 1,BINDERR,LISERR,NONBLOCKERR
};Log lg;
const int backlog = 5;
class Sock
{
public:Sock(){}void Socket(){_sockfd = socket(AF_INET, SOCK_STREAM, 0);if (_sockfd < 0){lg.logmessage(fatal, "socket error");exit(SOCKERR);}int opt = 1;setsockopt(_sockfd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)); // 防止偶发性的服务器无法进行立即重启(tcp协议的时候再说)}void Bind(uint16_t port){struct sockaddr_in local;memset(&local, 0, sizeof(local));local.sin_family = AF_INET;local.sin_addr.s_addr = INADDR_ANY;local.sin_port = htons(port);int bret = bind(_sockfd, (const struct sockaddr*)&local, sizeof(local));if (bret < 0){lg.logmessage(fatal, "bind error");exit(BINDERR);}}void Listen(){int lret = listen(_sockfd, backlog);if (lret < 0){lg.logmessage(fatal, "listen error");exit(LISERR);}}int Accept(string* clientip, uint16_t* clientport){sockaddr_in peer;socklen_t len = sizeof(peer);int newfd = accept(_sockfd, (sockaddr*)&peer, &len);if (newfd < 0){lg.logmessage(warning, "accept error");return -1;}char ipstr[64];inet_ntop(AF_INET, &peer.sin_addr, ipstr, sizeof(ipstr));*clientip = ipstr;*clientport = ntohs(peer.sin_port);return newfd;}bool Connect(const string ip, const uint16_t port){sockaddr_in peer;memset(&peer, 0, sizeof(peer));peer.sin_family = AF_INET;inet_pton(AF_INET, ip.c_str(), &peer.sin_addr);peer.sin_port = htons(port);int cret = connect(_sockfd, (const struct sockaddr*)&peer, sizeof(peer));if (cret == -1){lg.logmessage(warning, "connect error");return false;}return true;}void Close(){close(_sockfd);}int Fd(){return _sockfd;}~Sock(){}
public:int _sockfd;
};

Protocol.hpp

#pragma once
#include <string>
#include <jsoncpp/json/json.h>//#define MYSELF 1
//分隔符
const std::string black_sep = " ";
const std::string protocol_sep = "\n";//解决报文外部格式//len\n正文\nstd::string Encode(std::string& message){std::string package = std::to_string(message.size());package += protocol_sep;package += message;package += protocol_sep;return package;}//len\na + b\nbool Decode(std::string& message, std::string* content){std::size_t pos = message.find(protocol_sep);if (pos == std::string::npos){return false;}std::string len_str = message.substr(0, pos);std::size_t len = std::stoi(len_str);std::size_t total_len = len_str.size() + len + 2;//检查长度if (message.size() < total_len){return false;}*content = message.substr(pos + 1, len);//earse 移除报文message.erase(0, total_len);return true;}class Request
{
public:Request(){}Request(int a, int b, char oper){_num1 = a;_num2 = b;_op = oper;}//a + bbool Serialize(std::string* out){
#ifdef MYSELF//构建报文有效载荷std::string str;str += std::to_string(_num1);str += black_sep;str += _op;str += black_sep;str += std::to_string(_num2);*out = str;return true;
#elseJson::Value root;root["x"] = _num1;root["y"] = _num2;root["op"] = _op;Json::FastWriter w;*out = w.write(root);return true;
#endif}//a + bbool Deserialize(std::string& in){
#ifdef MYSELF//astd::size_t left = in.find(black_sep);if (left == std::string::npos){return false;         }std::string part_a = in.substr(0, left);// bstd::size_t right = in.rfind(black_sep);if (right == std::string::npos){return false;     }std::string part_b = in.substr(right + 1);//+if (left + 2 != right){return false;}_op = in[left+1];_num1 = std::stoi(part_a);_num2 = std::stoi(part_b);return true;
#else      Json::Value root;Json::Reader r;r.parse(in, root);_num1 = root["x"].asInt();_num2 = root["y"].asInt();_op = root["op"].asInt();return true;
#endif}void DebugPrint(){std::cout << "新请求构建完成:" << _num1 << _op << _num2 << std::endl;}public:int _num1;int _num2;char _op;
};class Response
{
public:Response(){}Response(int res, int cod){_result = res;_code = cod;}//1000 0bool Serialize(std::string* out){
#ifdef MYSELFstring str = std::to_string(_result);str += black_sep;str += std::to_string(_code);*out = str;return true;
#else Json::Value root;root["res"] = _result;root["code"] = _code;Json::FastWriter w;*out = w.write(root);return true;
#endif}//1000 0bool Deserialize(std::string& in){
#ifdef MYSELFstd::size_t pos = in.find(black_sep);if (pos  == std::string::npos){return false;}std::string left = in.substr(0, pos);std::string right = in.substr(pos + 1);_result = std::stoi(left);_code = std::stoi(right);return true;
#else Json::Value root;Json::Reader r;r.parse(in, root);_result = root["res"].asInt();_code = root["code"].asInt();return true;
#endif}void DebugPrint(){std::cout << "结果响应完成,result:" << _result << ",code:" << _code << std::endl;}public:int _result;int _code;   //0可信,否则表明对应的错误
};#define MySelf 1

Calcluator.hpp

#pragma once
#include "Protocol.hpp"enum
{DIVZERO = 1,MODZERO,OTHER_OPER
};class Calculator
{
public:Calculator(){}Response CalculatorHelp(const Request& req){Response res(0, 0);switch (req._op){case '+':res._result = req._num1 + req._num2;break;case '-':res._result = req._num1 - req._num2;break;case '*':res._result = req._num1 * req._num2;break;case '/':if (req._num2 == 0){res._code = DIVZERO;}else{res._result = req._num1 / req._num2;}break;case '%':if (req._num2 == 0){res._code = MODZERO;}else{res._result = req._num1 % req._num2;break;}default:res._code = OTHER_OPER;break;}return res;}std::string Handler(std::string& package){std::string content;bool r = Decode(package, &content);if (!r){return "";}Request req;r = req.Deserialize(content);if (!r){return "";}req.DebugPrint();content = "";Response res = CalculatorHelp(req);res.DebugPrint();res.Serialize(&content);content = Encode(content); // len\n正文\nreturn content;}~Calculator(){}
};

Log.hpp

#pragma once
#include <stdarg.h>
#include <iostream>
#include <stdio.h>
#include <cstring>
#include <time.h>
#include <cerrno>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>using namespace std;#define info 0
#define debug 1
#define warning 2
#define ERROR 3
#define fatal 4#define screen 1
#define onefile 2
#define classfile 3#define PATH "log.txt"class Log
{
public:Log(int style = screen){printstyle = style;dir = "log/";}void enable(int method){printstyle = method;}const char *leveltostring(int level){switch (level){case 0:return "info";break;case 1:return "debug";break;case 2:return "warning";break;case 3:return "error";break;case 4:return "fatal";break;default:return "none";break;}}void printlog(int level, const string &logtxt){switch (printstyle){case screen:cout << logtxt;break;case onefile:printonefile(PATH, logtxt);break;case classfile:printclassfile(level, logtxt);break;}}void logmessage(int level, const char *format, ...){time_t t = time(0);tm *ctime = localtime(&t);char leftbuff[1024];sprintf(leftbuff, "[%s]%d-%d-%d %d:%d:%d:", leveltostring(level), ctime->tm_year + 1900,ctime->tm_mon + 1, ctime->tm_mday, ctime->tm_hour, ctime->tm_min, ctime->tm_sec);char rightbuff[1024];va_list s;va_start(s, format);vsprintf(rightbuff, format, s);va_end(s);char logtext[2048];sprintf(logtext, "%s %s\n", leftbuff, rightbuff);//printf(logtext);printlog(level, logtext);}void printonefile(const string& logname, const string& logtxt){int fd = open(logname.c_str(), O_WRONLY | O_CREAT | O_APPEND, 0666);  if (fd < 0){return;}write(fd, logtxt.c_str(), logtxt.size());close(fd);}void printclassfile(int level, const string &logtxt){//log.txt.infostring filename = dir + PATH;filename += ".";filename += leveltostring(level);printonefile(filename, logtxt);}~Log(){};private:int printstyle;string dir; //分类日志,放入目录中
};// int sum(int n, ...)
// {
//     int sum = 0;
//     va_list s;
//     va_start(s, n);//     while (n)
//     {
//         sum = sum + va_arg(s, int);
//         n--;
//     }//     return sum;
// }

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.12.2)
project(TpcServer)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(CMAKE_CXX_STANDARD_REQUIRED ON) # 确保必须使用指定的标准add_executable(TpcServer TpcServer.cc)
target_link_libraries(TpcServer jsoncpp)add_executable(Client Client.cc)
target_link_libraries(Client jsoncpp)

5. 改进

listen分离

将TpcServer里的listen套接字提出来单独成一个类，将Accpeter获取连接的函数放到这个类，通过AddCpnnection函数加入关注，这个类就做listen的连接管理。这样做的好处是可以将listen连接也作为一个正常连接统一处理

后续的设计可以加入多线程，主线程维护vector，里面是获得的连接fd，线程之间通信，争取这个fd会话，每一个线程也是一个Ractor，也可以负载均衡式的分配连接。这样就可以加入多线程，同时每个连接的报文内容处理如果比较复杂，可以交由线程池来处理，只需要拿到结果
这种一个连接一个reacotr，叫one thread one loop

连接管理

对于一些不活跃的连接需要处理。使用一个定时器类，里面保存一个最小堆，存每个连接的超时时间，可以回指connection和tpcserver做更多开发。在主循环每次事件分配后可以做一些其他事情，就是查询超时连接，如果有可以走错误处理，关闭这个链接。同时，事件分配的等待时间可以设置为堆顶的超时时间

6. Reactor的理论

它是一个半同步半异步的模型，类似于打地鼠，监测哪个链接有事件就处理哪个。同步体现在事件的就绪是需要等，异步体现在回调函数，如果不想自己做，可以交由线程处理，比如报文的处理可以由线程来，直接取得结果。这种叫反应堆