C++高并发网络架构与实现——第六篇

目录

一，将客户端改为多线程

二，为服务器添加多线程处理消息

---

今日实现任务

1. 将客户端改为多线程
2. 为服务器添加多线程处理消息
3. 添加客户端退出事件，并且对代码进行注解，补充，代码调整
4. 实现阶段目标，一秒发送200万包，能够稳定处理，并且对代码也进行了优化等

1，客户端架构

即启动多个线程，然后在每个线程中建立客户端，然后与服务器进行连接，进行发送消息的活动。

eg:

之前的方法是在主线程中建立1000个客户端，然后进行连接和发送消息。

现在创立四个线程，然后将1000个客户端分散到四个线程中，每个线程处理250个从而减轻压力，并且提升速度。

2，服务器架构

启动多个线程，在客户端连接之后，将新连接的客户端分配到数量比较少的线程中，然后在每个线程中与客户端进行接收消息的活动。

eg:

之前的方法是在主线程中处理连接后的1000个客户端，然后进行连接和发送消息。

现在创立四个线程，然后将连接的1000个客户端分散到四个线程中，每个线程处理250个达到减轻压力，并且提升速度的目的。

3，整体架构

现在还有待提升的地方就是服务器连接客户端的过程，提升一秒接收客户端的连接数量。

一，将客户端改为多线程

• EasyTcpClient.hpp

#include "EasyTcpClient.hpp"
#include<thread>
#include<mutex>
bool g_bRun = true;
mutex _mutexx;
void cmdThread()//(EasyTcpClient* client)
{
	while (1)
	{
		char cmdBuf[256] = {};

		cin >> cmdBuf;

		if (strcmp(cmdBuf, "exit") == 0){
			g_bRun = false;
			cout << "退出子线程" << endl;
			return;
		}
		else{
			cout << "不支持的命令" << endl;
		}
	}
}

//客户端数量
const int cCount = 100;
//发送线程数量
const int tCount = 4;
//客户端数组
EasyTcpClient* client[cCount];

void sendThread(int id)
{
	{
		lock_guard<mutex> lock(_mutexx);
		cout << "thread " << id << " start" << endl;
	}
	//四个线程ID
	int c = cCount / tCount;
	int begin = (id - 1)*c;
	int end = id*c;

	for (int i = begin; i < end; i++)
	{
		client[i] = new EasyTcpClient();
	}
	for (int i = begin; i < end; i++)
	{
		client[i]->Connect((char *)"127.0.0.1", 4567); //192.168.247.128   
	}

	cout << "thread=" << id << "  Connect=" << begin << "  end= " << end << endl;


	chrono::milliseconds t(3000);
	this_thread::sleep_for(t);

	Login login[1];
	for (int i = 0; i < 10; i++)
	{
		strcpy(login[i].userName, "lyd");
		strcpy(login[i].PassWord, "lydmm");
	}
	const int nLen = sizeof(login);
	int _true = 1;
	while (g_bRun && _true)
	{
		for (int i = begin; i < end; i++)
		{
			if (client[i]->SendData(login,nLen) == SOCKET_ERROR)
			{
				_true = 0;
				break;
			}
			client[i]->OnRun();
		}
	}

	for (int i = begin; i < end; i++)
	{
		delete client[i];
		client[i]->Close();
	}
	g_bRun = false;
	cout << "thread  " << id << "  exit" << endl;
	
}

int main()
{
	//启动UI线程
	thread t1(cmdThread);         //启动线程函数
	t1.detach();

	//启动发送线程
	for (int n = 0; n < tCount; n++)
	{
		thread t1(sendThread, n + 1);
		t1.detach();
	}

	while (g_bRun)
	{
		Sleep(100);
	}

	cout << "已退出" << endl;
	system("pause");
	return 0;
}

• MessageHeader.hpp

enum CMD
{
	CMD_LOGIN,       //登入
	CMD_LOGIN_RESULT,
	CMD_LOGOUT,      //登出
	CMD_LOGOUT_RESULT,
	CMD_NEW_USER_JOIN,      //新的用户加入
	CMD_ERROR,       //错误
};

struct DataHeader
{
	DataHeader()
	{
		dataLength = sizeof(DataHeader);
		cmd = CMD_ERROR;
	}
	short dataLength;
	short cmd;
};

//匹配四个消息结构体
struct Login : public DataHeader
{
	Login()
	{
		dataLength = sizeof(Login);
		cmd = CMD_LOGIN;
	}
	char userName[32];
	char PassWord[32];
	//char data[932];
};

struct LoginResult : public DataHeader
{
	LoginResult()
	{
		dataLength = sizeof(LoginResult);
		cmd = CMD_LOGIN_RESULT;
		result = 0;
	}
	int result;
	//char data[992];
};

struct Logout : public DataHeader
{
	Logout()
	{
		dataLength = sizeof(Logout);
		cmd = CMD_LOGOUT;
	}
	char userName[32];
};

struct LogoutResult : public DataHeader
{
	LogoutResult()
	{
		dataLength = sizeof(LogoutResult);
		cmd = CMD_LOGOUT_RESULT;
		result = 0;
	}
	int result;
};

struct NewUserJoin :public DataHeader
{
	NewUserJoin()
	{
		dataLength = sizeof(NewUserJoin);
		cmd = CMD_NEW_USER_JOIN;
		sock = 0;
	}
	int sock;
};

• client.cpp

#include "EasyTcpClient.hpp"
#include<thread>
#include<mutex>
bool g_bRun = true;
mutex _mutexx;
void cmdThread()//(EasyTcpClient* client)
{
	while (1)
	{
		char cmdBuf[256] = {};

		cin >> cmdBuf;

		if (strcmp(cmdBuf, "exit") == 0){
			g_bRun = false;
			cout << "退出子线程" << endl;
			return;
		}
		else{
			cout << "不支持的命令" << endl;
		}
	}
}

//客户端数量
const int cCount = 100;
//发送线程数量
const int tCount = 4;
//客户端数组
EasyTcpClient* client[cCount];

void sendThread(int id)
{
	{
		lock_guard<mutex> lock(_mutexx);
		cout << "thread " << id << " start" << endl;
	}
	//四个线程ID
	int c = cCount / tCount;
	int begin = (id - 1)*c;
	int end = id*c;

	for (int i = begin; i < end; i++)
	{
		client[i] = new EasyTcpClient();
	}
	for (int i = begin; i < end; i++)
	{
		client[i]->Connect((char *)"127.0.0.1", 4567); //192.168.247.128   
	}

	cout << "thread=" << id << "  Connect=" << begin << "  end= " << end << endl;


	chrono::milliseconds t(3000);
	this_thread::sleep_for(t);

	Login login[1];
	for (int i = 0; i < 10; i++)
	{
		strcpy(login[i].userName, "lyd");
		strcpy(login[i].PassWord, "lydmm");
	}
	const int nLen = sizeof(login);
	int _true = 1;
	while (g_bRun && _true)
	{
		for (int i = begin; i < end; i++)
		{
			if (client[i]->SendData(login,nLen) == SOCKET_ERROR)
			{
				_true = 0;
				break;
			}
			client[i]->OnRun();
		}
	}

	for (int i = begin; i < end; i++)
	{
		delete client[i];
		client[i]->Close();
	}
	g_bRun = false;
	cout << "thread  " << id << "  exit" << endl;
	
}

int main()
{
	//启动UI线程
	thread t1(cmdThread);         //启动线程函数
	t1.detach();

	//启动发送线程
	for (int n = 0; n < tCount; n++)
	{
		thread t1(sendThread, n + 1);
		t1.detach();
	}

	while (g_bRun)
	{
		Sleep(100);
	}

	cout << "已退出" << endl;
	system("pause");
	return 0;
}

二，为服务器添加多线程处理消息

• CELLTimestamp.hpp

#ifndef CELLTimestamp_hpp_
#define CELLTimestamp_hpp_

#pragma once
#include<chrono>
using namespace std::chrono;

class CELLTimestamp
{
public:
	CELLTimestamp()
	{
		update();
	}
	~CELLTimestamp()
	{

	}

	void update()
	{
		_begin = high_resolution_clock::now();
	}

	//获取当前秒
	double getElapsedSecond()
	{
		return this->getElapsedTimeInMicroSec() * 0.000001;
	}
	//获取毫秒
	double getElapsedTimeInMilliSec()
	{
		return this->getElapsedTimeInMicroSec() * 0.001;
	}
	//获取微秒
	long long getElapsedTimeInMicroSec()
	{
		return duration_cast<microseconds>(high_resolution_clock::now() - _begin).count();
	}
protected:
	time_point<high_resolution_clock> _begin;
};

#endif

• EasyTcpServer.hpp

#ifndef _EasyTcpServer_hpp_
#define _EasyTcpServer_hpp_

#ifdef _WIN32
#define FD_SETSIZE 10240
#define WIN32_LEAN_AND_MEAN
#include<windows.h>
#include<Winsock2.h>
#pragma comment(lib,"ws2_32.lib")
#else
#include<unistd.h>
#include<arpa/inet.h>
#include<string.h>

#define SOCKET int
#define INVALID_SOCKET       (SOCKET)(~0)
#define SOCKET_ERROR                 (-1)
#endif

#include<iostream>
#include<vector>
#include<thread>
#include<mutex>
#include<atomic>

#include"MessageHeader.hpp"
#include"CELLTimestamp.hpp"
using namespace std;

//缓冲区最小单元大小
#ifndef RECV_BUFF_SIZE
#define RECV_BUFF_SIZE 10240
#endif

//#define _CellServer_THREAD_COUNT 4

//客户端数据类型
class ClientSocket
{
public:
	ClientSocket(SOCKET sockfd = INVALID_SOCKET)
	{
		_sockfd = sockfd;
		memset(_szMsgBuf, 0, sizeof(_szMsgBuf));
		_lastPos = 0;
	}

	SOCKET sockfd()
	{
		return _sockfd;
	}

	char *msgBuf()
	{
		return _szMsgBuf;
	}

	int getLastPos()
	{
		return _lastPos;
	}

	void setLastPos(int pos)
	{
		_lastPos = pos;
	}

	//发送数据
	int SendData(DataHeader *header)
	{
		if (header)
		{
			return (int)send(_sockfd, (const char *)header, header->dataLength, 0);
		}
		return SOCKET_ERROR;
	}
private:
	SOCKET _sockfd;
	//第二缓冲区，消息缓冲区
	char _szMsgBuf[RECV_BUFF_SIZE * 10];
	//消息缓冲区的数据尾部位置
	int _lastPos = 0;
};

//网络事件接口
class INetEvent
{
public:
	//客户端加入事件
	virtual void OnNetJoin(ClientSocket *pClient) = 0;
	//客户端离开事件
	virtual void OnNetLeave(ClientSocket *pClient) = 0;
	//客户端消息事件
	virtual void OnNetMsg(ClientSocket *pClient, DataHeader *header) = 0;
private:

};


class CellServer
{
public:
	CellServer(SOCKET sock = INVALID_SOCKET)
	{
		_sock = sock;
		_pNetEvent = nullptr;
	}

	~CellServer()
	{
		Close();
		_sock = INVALID_SOCKET;
	}

	//是否工作中
	bool isRun()
	{
		return _sock != INVALID_SOCKET;
	}

	void setEventObj(INetEvent *event)
	{
		_pNetEvent = event;
	}

	//关闭Socket
	void Close()
	{
		if (_sock != INVALID_SOCKET)
		{
#ifdef _WIN32
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				closesocket(_clients[n]->sockfd());
				delete _clients[n];
			}

			//关闭套接字closesocket
			closesocket(_sock);
			//-----------
			//清除Windows socket环境
			//WSACleanup();
#else
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				close(_clients[n]->sockfd());
				delete _clients[n];
			}
			//关闭套接字closesocket
			close(_sock);
#endif
			_clients.clear();
		}
	}

	//int mun = 0;
	//处理网络消息
	bool OnRun()
	{
		while (isRun())
		{
			//从缓冲区中取出客户数据
			if (_clientsBuff.size() >0)
			{
				lock_guard<mutex> lock(_mutex);
				for (auto pClient : _clientsBuff)
				{
					_clients.push_back(pClient);
				}
				_clientsBuff.clear();
			}

			//如果没有需要处理的客户端就跳过
			if (_clients.empty())
			{
				chrono::milliseconds t(1);
				this_thread::sleep_for(t);
				continue;
				//return true;
			}

			//伯克利套接字
			fd_set fdRead;
			//fd_set fdWrite;
			//fd_set fdExp;

			//清理集合
			FD_ZERO(&fdRead);
			//FD_ZERO(&fdWrite);
			//FD_ZERO(&fdExp);
			
			//将描述符(socket)加入集合
			//FD_SET(_sock, &fdRead);
			//FD_SET(_sock, &fdWrite);
			//FD_SET(_sock, &fdExp);

			//将描述符(socket)加入集合
			SOCKET maxSock = _clients[0]->sockfd();
			int nn = (int)_clients.size() - 1;
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				FD_SET(_clients[n]->sockfd(), &fdRead);
				if (maxSock < _clients[n]->sockfd())
				{
					maxSock = _clients[n]->sockfd();
				}
			}

			//nfds 是一个整数值，是指fd_set集合中所有描述符（socket）的范围，而不是数量
			//即是所有文件描述符最大值+1，在Windows中这个参数可以写0

			//添加非阻塞
			//timeval t = { 1, 0 };

			int ret = select(maxSock + 1, &fdRead, 0, 0, nullptr);

			if (ret < 0)
			{
				//cout << "select任务结束  " <<nn<< endl;
				//Close();
				continue;
			}

			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				if (FD_ISSET(_clients[n]->sockfd(), &fdRead))
				{ 
					if (RecvData(_clients[n]) == -1)
					{
						auto iter = _clients.begin() + n;
						if (iter != _clients.end())
						{
							if (_pNetEvent)
							{
								_pNetEvent->OnNetLeave(_clients[n]);
							}
							///顺序不能变
							delete _clients[n];
							_clients.erase(iter);
						}
					}
				}
			}
		}
		return true;
	}

	//缓冲区
	char _szRecv[RECV_BUFF_SIZE];// = {};
	//接收数据 处理粘包哦拆分包
	int RecvData(ClientSocket* pClient)
	{
		//5，接受客户端的请求数据
		int nLen = (int)recv(pClient->sockfd(), (char*)&_szRecv, RECV_BUFF_SIZE, 0);
		if (nLen <= 0)
		{
			//cout <<pClient->sockfd()<< " 客户端已经退出,任务结束" << endl;
			return -1;
		}
		//将收取到的消息拷贝到消息缓冲区
		memcpy(pClient->msgBuf() + pClient->getLastPos(), _szRecv, nLen);
		//消息缓冲区的数据尾部后移
		pClient->setLastPos(pClient->getLastPos() + nLen);

		//判断消息缓冲区的数据长度大于消息头DataHeader长度
		while (pClient->getLastPos() >= sizeof(DataHeader))
		{
			//这个时候就知道当前消息长度
			DataHeader *header = (DataHeader*)pClient->msgBuf();
			//判断消息缓冲区的长度大于消息长度
			if (pClient->getLastPos() >= header->dataLength)
			{
				//消息缓冲区剩余未处理数据的长度
				int nSize = pClient->getLastPos() - header->dataLength;
				//处理网络消息
				OnNetMsg(pClient, header);
				//将消息缓冲区剩余未处理数据前移
				memcpy(pClient->msgBuf(), pClient->msgBuf() + header->dataLength, nSize);
				pClient->setLastPos(nSize);
			}
			else{
				//消息缓冲区剩余数据不够一条完整消息
				break;
			}
		}
		return 0;
	}

	//响应网络消息
	virtual void OnNetMsg(ClientSocket *pClient, DataHeader *header)
	{
		_pNetEvent->OnNetMsg(pClient, header);
	}

	void addClient(ClientSocket *pClient)
	{
		lock_guard<mutex> lock(_mutex);
		//_mutex.lock();
		_clientsBuff.push_back(pClient);
		//_mutex.unlock();
	}
	
	void Start()
	{
		_thread = thread(mem_fn(&CellServer::OnRun), this);
	}

	size_t getClientCount()
	{
		return _clients.size()+_clientsBuff.size();
	}
private:
	SOCKET _sock;
	//正式客户队列
	vector<ClientSocket*> _clients;
	//客户缓冲队列
	vector<ClientSocket*> _clientsBuff;
	//缓冲队列的锁
	mutex _mutex;
	thread _thread;
	//网络事件对象
	INetEvent *_pNetEvent;
};


class EasyTcpServer:public INetEvent
{
private:
	SOCKET _sock;
	//vector<ClientSocket*> _clients;
	//消息处理对象，内部会创建线程
	vector<CellServer*> _cellServers;
	//每秒消息计时
	CELLTimestamp _tTime;
	//收到消息计数
public:
	atomic<int> _recvCount;
	//客户端计数
	atomic<int> _clientCount;

public:
	EasyTcpServer()
	{
		_sock = INVALID_SOCKET;
		_recvCount = 0;
		_clientCount = 0;
	}

	virtual ~EasyTcpServer()
	{
		Close();
	}

	//初始化Socket
	SOCKET InitSocket()
	{
#ifdef _WIN32
		//启动Windows socket 2.x环境
		WORD ver = MAKEWORD(2, 2);
		WSADATA dat;
		WSAStartup(ver, &dat);
#endif
		//1，用Socket API建立建立TCP客户端
		if (_sock != INVALID_SOCKET)
		{
			cout << "_sock=" << (int)_sock << "关闭旧连接" << endl;
			Close();
		}
		_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

		if (_sock == INVALID_SOCKET)
		{
			cout << "建立socket失败" << endl;
		}
		else
		{
			cout << (int)_sock << " 建立socket成功" << endl;
		}
		return _sock;
	}

	//绑定IP和端口号
	int Bind(const char *ip, unsigned short port)
	{
		//if (_sock != INVALID_SOCKET)
		//{
		//    InitSocket();
		//}
		//2，bind 绑定用于接受客户端连接的网络接口
		sockaddr_in _sin = {};
		_sin.sin_family = AF_INET;
		_sin.sin_port = htons(port);
#ifdef _WIN32
		if (ip){
			_sin.sin_addr.S_un.S_addr = inet_addr(ip);
		}
		else{
			_sin.sin_addr.S_un.S_addr = INADDR_ANY;
		}
#else
		if (ip){
			_sin.sin_addr.s_addr = inet_addr(ip);
		}
		else{
			_sin.sin_addr.s_addr = INADDR_ANY;
		}
#endif


		int ret = ::bind(_sock, (sockaddr*)&_sin, sizeof(_sin));
		if (SOCKET_ERROR == ret)
		{
			cout << (int)_sock << "错误，绑定网络端口失败" << endl;
		}
		else
		{
			cout << "绑定网络端口成功" << port << endl;
		}
		return ret;
	}

	//监听端口号
	int Listen(int n)
	{
		int ret = listen(_sock, n);
		if (SOCKET_ERROR == ret)
		{
			cout << (int)_sock << " 错误，监听网络端口失败" << endl;
		}
		else
		{
			cout << (int)_sock << " 监听网络端口成功" << endl;
		}
		return ret;
	}

	//接受客户端连接
	SOCKET Accept()
	{
		//4，accept 等待客户端连接
		sockaddr_in clientAddr = {};
		int nAddrlen = sizeof(clientAddr);
		SOCKET cSock = INVALID_SOCKET;

#ifdef _WIN32
		cSock = accept(_sock, (sockaddr *)&clientAddr, &nAddrlen);
#else
		cSock = accept(_sock, (sockaddr *)&clientAddr, (socklen_t *)&nAddrlen);
#endif
		if (INVALID_SOCKET == cSock)
		{
			cout << (int)_sock << " 错误，接受到无效的客户端连接" << endl;
		}
		else
		{
			//NewUserJoin userJoin;
			//SendDataToAll(&userJoin);
			//将新客户端分配给客户端数量最少的cellServer
			addClientToCellServer(new ClientSocket(cSock));
			//获取IP地址 inet_ntoa(clientAddr.sin_addr)
		}
		return _sock;
	}


	void addClientToCellServer(ClientSocket *pClient)
	{
		//_clients.push_back(pClient);
		//查找客户数量最少的CellServer消息处理对象
		auto pMinServer = _cellServers[0];
		for (auto pCellServer : _cellServers)
		{
			if (pMinServer->getClientCount() > pCellServer->getClientCount())
			{
				pMinServer = pCellServer;
			}
		}
		pMinServer->addClient(pClient);
		OnNetJoin(pClient);
	}


	void Start(int _CellServer_THREAD_COUNT)
	{
		for (int n = 0; n < _CellServer_THREAD_COUNT; n++)
		{
			auto ser = new CellServer(_sock);
			_cellServers.push_back(ser);
			//注册网络事件接收对象
			ser->setEventObj(this);
			//启动消息处理线程
			ser->Start();
		}
	}

	//关闭Socket
	void Close()
	{
		if (_sock != INVALID_SOCKET)
		{
#ifdef _WIN32
			//for (int n = (int)_clients.size() - 1; n >= 0; n--)
			//{
			//	closesocket(_clients[n]->sockfd());
			//	delete _clients[n];
			//}

			//关闭套接字closesocket
			closesocket(_sock);
			//-------------
			//清除Windows socket环境
			WSACleanup();
#else
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				close(_clients[n]->sockfd());
				delete _clients[n];
			}
			//8，关闭套接字closesocket
			close(_sock);
#endif
			//_clients.clear();
		}
	}

	//处理网络消息
	bool OnRun()
	{
		if (isRun())
		{
			time4msg();
			//伯克利套接字
			fd_set fdRead;
			//fd_set fdWrite;
			//fd_set fdExp;

			FD_ZERO(&fdRead);
			//FD_ZERO(&fdWrite);
			//FD_ZERO(&fdExp);

			FD_SET(_sock, &fdRead);
			//FD_SET(_sock, &fdWrite);
			//FD_SET(_sock, &fdExp);

			//nfds 是一个整数值，是指fd_set集合中所有描述符（socket）的范围，而不是数量
			//即是所有文件描述符最大值+1，在Windows中这个参数可以写0

			//添加非阻塞
			timeval t = { 0, 10 };

			int ret = select(_sock + 1, &fdRead, 0, 0, &t);  //

			if (ret < 0)
			{
				cout << "Accept Select任务结束" << endl;
				Close();
				return false;
			}

			if (FD_ISSET(_sock, &fdRead))
			{
				FD_CLR(_sock, &fdRead);
				Accept();
				return true;
			}

			return true;
		}
		return false;
	}

	//是否工作中
	bool isRun()
	{
		return _sock != INVALID_SOCKET;
	}

	//响应网络消息
	void time4msg()
	{
		auto t1 = _tTime.getElapsedSecond();
		if (_tTime.getElapsedSecond() >= 1.0)
		{
			//cout << "thread   "<<_cellServers.size()<<"   tTime    " << t1 <<"    client    " <<(int)_clients.size()<<"	socket	" << _sock << "	_recvCount	" << _recvCount<< endl;
			cout << "thread   " << _cellServers.size() << "   tTime    " << t1 << "    client    " << (int)_clientCount << "	socket	" << _sock << "	_recvCount	" << _recvCount << endl;
			_recvCount = 0;
			_tTime.update();
		}
	}

	//群发消息
	//void SendDataToAll(DataHeader *header)
	//{
	//	for (int n = (int)_clients.size() - 1; n >= 0; n--)
	//	{
	//		SendData(_clients[n]->sockfd(), header);
	//	}
	//}
	

	//只会被一个线程调用 安全
	virtual void OnNetJoin(ClientSocket *pClient)
	{
		_clientCount++;
	}
	//4 多个线程触发不安全
	//如果只开启一个cellServer就是安全的
	virtual void OnNetLeave(ClientSocket *pClient)
	{
		_clientCount--;
		//for (int n = (int)_clients.size() - 1; n >= 0; n--)
		//{
		//	if (_clients[n] == pClient)
		//	{
		//		auto iter = _clients.begin() + n;
		//		if (iter != _clients.end())
		//		{
		//			_clients.erase(iter);
		//		}
		//	}
		//}
	}
	//4 多个线程触发不安全
	//如果只开启一个cellServer就是安全的
	virtual void OnNetMsg(ClientSocket *pClient, DataHeader *header)
	{
		_recvCount++;
	}
};

#endif

• MessageHeader.hpp

enum CMD
{
	CMD_LOGIN,       //登入
	CMD_LOGIN_RESULT,
	CMD_LOGOUT,      //登出
	CMD_LOGOUT_RESULT,
	CMD_NEW_USER_JOIN,      //新的用户加入
	CMD_ERROR,       //错误
};

struct DataHeader
{
	DataHeader()
	{
		dataLength = sizeof(DataHeader);
		cmd = CMD_ERROR;
	}
	short dataLength;
	short cmd;
};

//匹配四个消息结构体
struct Login : public DataHeader
{
	Login()
	{
		dataLength = sizeof(Login);
		cmd = CMD_LOGIN;
	}
	char userName[32];
	char PassWord[32];
	//char data[932];
};

struct LoginResult : public DataHeader
{
	LoginResult()
	{
		dataLength = sizeof(LoginResult);
		cmd = CMD_LOGIN_RESULT;
		result = 0;
	}
	int result;
	//char data[992];
};

struct Logout : public DataHeader
{
	Logout()
	{
		dataLength = sizeof(Logout);
		cmd = CMD_LOGOUT;
	}
	char userName[32];
};

struct LogoutResult : public DataHeader
{
	LogoutResult()
	{
		dataLength = sizeof(LogoutResult);
		cmd = CMD_LOGOUT_RESULT;
		result = 0;
	}
	int result;
};

struct NewUserJoin :public DataHeader
{
	NewUserJoin()
	{
		dataLength = sizeof(NewUserJoin);
		cmd = CMD_NEW_USER_JOIN;
		sock = 0;
	}
	int sock;
};

• server.cpp

#include"EasyTcpServer.hpp"
#include<thread>

class MyServer :public EasyTcpServer
{
public:
	//只会被一个线程调用 安全
	virtual void OnNetJoin(ClientSocket *pClient)
	{
		_clientCount++;
		//cout << "client " << pClient->sockfd() << "join" << endl;
	}
	//4 多个线程触发不安全
	//如果只开启一个cellServer就是安全的
	virtual void OnNetLeave(ClientSocket *pClient)
	{
		_clientCount--;
		//cout << "client " << pClient->sockfd() << "leave" << endl;
	}
	//4 多个线程触发不安全
	//如果只开启一个cellServer就是安全的
	virtual void OnNetMsg(ClientSocket *pClient, DataHeader *header)
	{
		_recvCount++;
		switch (header->cmd)
		{
		case CMD_LOGIN:
		{
						  //做数据偏移
						  Login *login = (Login*)header;
						  //cout << "收到命令：CMD_LOGIN,  数据长度：" << login->dataLength;
						  //cout << "  UserName：" << login->userName << "  PassWord：" << login->PassWord << endl;
						  //忽略判断用户名密码是否正确的过程
						  LoginResult ret;
						  pClient->SendData(&ret);
		}
			break;
		case CMD_LOGOUT:
		{
						   Login *logout = (Login*)header;
						   cout << "收到命令：CMD_LOGIN,  数据长度：" << logout->dataLength;
						   cout << "  UserName：" << logout->userName << endl;
						   //忽略判断用户名密码是否正确的过程
						   LogoutResult ret;
						   //SendData(_cSock, (DataHeader *)&ret);
		}
			break;
		default:
		{
				   cout << pClient->sockfd() << "  收到未定义的消息，数据长度  " << header->dataLength;
				   DataHeader ret;
				   //SendData(_cSock, (DataHeader *)&ret);
		}
			break;
		}
	}
private:

};
int main()
{
	MyServer server;
	server.InitSocket();
	server.Bind(nullptr, 4567);
	server.Listen(5);
	server.Start(4);

	while (server.isRun())
	{
		server.OnRun();
	}

	server.Close();
	cout << "已退出" << endl;
	system("pause");
	return 0;
}