网络开源框架之libevent使用实例

#pragma once
#include "CLibEventData.h"
#include "LibEventFunction.h"
#include "LibUserFunction.h"
class CLibEvent
{
public:
	CLibEvent(void);
	~CLibEvent(void);
private:
	//当前服务器对象
	Server m_Server;
public:
	bool StartServer(int port, short workernum, unsigned int connnum, int read_timeout, int write_timeout);
	void StopServer();
private:
	void LoadFuns();
	static void DoAccept(struct evconnlistener *listener, evutil_socket_t fd,struct sockaddr *sa, int socklen, void *user_data);
	static void DoError(struct bufferevent *bev, short error, void *ctx);
	static void CloseConn(Conn *pConn,int nFunID);
	static void CloseConn(Conn *pConn);
	static void DoRead(struct bufferevent *bev, void *ctx);
	static DWORD WINAPI ThreadServer(LPVOID lPVOID);
	static DWORD WINAPI ThreadWorkers(LPVOID lPVOID);
};

#include "StdAfx.h"
#include "LibEvent.h"

#include 
#include 
using namespace std;

#include 
#include 

#include 
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"wsock32.lib")

#include "LibEventFunction.h"

#ifdef _DEBUG
#pragma comment (lib,"libevent.lib")
#else
#pragma comment (lib,"libevent.lib")
#endif

CLibEvent::CLibEvent(void)
{	
	LoadFuns();
	ZeroMemory(&m_Server,sizeof(m_Server));
	WSADATA WSAData;
	WSAStartup(0x0201, &WSAData);
}

CLibEvent::~CLibEvent(void)
{
	WSACleanup();
}

bool CLibEvent::StartServer(int port, short workernum, unsigned int connnum, int read_timeout, int write_timeout)
{	
	m_Server.bStart=false;
	m_Server.nCurrentWorker=0;
	m_Server.nPort=port;
	m_Server.workernum=workernum;
	m_Server.connnum=connnum;
	m_Server.read_timeout=read_timeout;
	m_Server.write_timeout=write_timeout;
	evthread_use_windows_threads();
	m_Server.pBase=event_base_new();
	if (m_Server.pBase==NULL)
	{
		return false;
	}
	struct sockaddr_in sin;
	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_port = htons(m_Server.nPort);
	m_Server.pListener=evconnlistener_new_bind(m_Server.pBase,DoAccept,(void*)&m_Server,LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_FREE,-1,(struct sockaddr*)&sin,sizeof(sin));
	if (m_Server.pListener==NULL)
	{
		return false;
	}	
	CLibEventFunction::RegistConnectedFunc(CLibUserFunction::Connect);
	CLibEventFunction::RegistDisconnectedFunc(CLibUserFunction::DisConnect);	
	CLibEventFunction::RegistStx(emStx);
	m_Server.pWorker=new Worker[workernum];
	for (int i=0;iplistConn=new Conn[m_Server.connnum+1];
			m_Server.pWorker[i].pListConn->head=&m_Server.pWorker[i].pListConn->plistConn[0];
			m_Server.pWorker[i].pListConn->tail=&m_Server.pWorker[i].pListConn->plistConn[m_Server.connnum];
			for (int j=0; jplistConn[j].index=j;
				m_Server.pWorker[i].pListConn->plistConn[j].next=&m_Server.pWorker[i].pListConn->plistConn[j+1];
			}
			m_Server.pWorker[i].pListConn->plistConn[m_Server.connnum].index=m_Server.connnum;
			m_Server.pWorker[i].pListConn->plistConn[m_Server.connnum].next=NULL;
			//设置当前事件
			Conn *p=m_Server.pWorker[i].pListConn->head;
			while (p!=NULL)
			{
				p->bufev=bufferevent_socket_new(m_Server.pWorker[i].pWokerbase,-1, BEV_OPT_CLOSE_ON_FREE);
				if (p->bufev==NULL) 
				{
					return false;
				}
				bufferevent_setcb(p->bufev, DoRead, NULL, DoError, p);
				bufferevent_setwatermark(p->bufev, EV_READ, 0, emMaxBuffLen);
				bufferevent_enable(p->bufev, EV_READ|EV_WRITE);
				struct timeval delayWriteTimeout;
				delayWriteTimeout.tv_sec=m_Server.write_timeout;
				delayWriteTimeout.tv_usec=0;
				struct timeval delayReadTimeout;
				delayReadTimeout.tv_sec=m_Server.read_timeout;
				delayReadTimeout.tv_usec=0;
				bufferevent_set_timeouts(p->bufev,&delayReadTimeout,&delayWriteTimeout);
				p->owner=&m_Server.pWorker[i];
				p=p->next;
			}
		}
		m_Server.pWorker[i].hThread=CreateThread(NULL,0,ThreadWorkers,&m_Server.pWorker[i],0,NULL);
	}
	m_Server.hThread=CreateThread(NULL,0,ThreadServer,&m_Server,0,NULL);
	if (m_Server.hThread==NULL)
	{
		return false;
	}
	m_Server.bStart=true;
	return true;
}

void CLibEvent::StopServer()
{
	if (m_Server.bStart)
	{
		struct timeval delay = { 2, 0 };
		event_base_loopexit(m_Server.pBase, &delay);
		WaitForSingleObject(m_Server.hThread,INFINITE);
		if (m_Server.pWorker)
		{
			for (int i=0;iin_buf_len+=evbuffer_remove(input, c->in_buf,emMaxBuffLen-c->in_buf_len);         
        }		
		while(true)
		{
			//一个协议包的请求头还没读完，则继续循环读或者等待下一个libevent时间进行循环读
			if (c->in_buf_lenin_buf;
			if (h->pkglen >emMaxBuffLen-sizeof(Head)||h->pkglenstx!=CLibEventFunction::LoadStx()) 
			{
				//请求包不合法
				CloseConn(c);
				return;
			}
			//读取的数据不够
			if (c->in_buf_lenpkglen) 
			{
				return;
			}
			//执行协议指令
			if (h->nFunID>emFunBase&&CLibEventFunction::DispatchFunction(h->nFunID,NULL)) 
			{
				switch(CLibEventFunction::DispatchFunction(h->nFunID,c))
				{
				case emFunReturnSend:
					{
						struct evbuffer * output=bufferevent_get_output(bev);
						evbuffer_add(output,c->out_buf,c->out_buf_len);
					}
					break;
				case emFunReturClose:
					{
						CloseConn(c);
					}
					return;
				case emFunReturnRecv:
					break;
				}				
			} else 
			{
				CloseConn(c);
				return;
			}
			//处理下一个协议包，或者继续读
			c->in_buf_len-=h->pkglen;
			if (c->in_buf_len==0)
			{
				break;
			}
			else
			{
				assert(c->in_buf_len>0);
				memmove(c->in_buf,c->in_buf+h->pkglen,c->in_buf_len);
			}
		}
    }
}

void CLibEvent::CloseConn(Conn *pConn,int nFunID)
{
	pConn->in_buf_len = 0;
	CLibEventFunction::DispatchFunction(nFunID,pConn);
	bufferevent_disable(pConn->bufev, EV_READ | EV_WRITE);
	evutil_closesocket(pConn->fd);
	pConn->owner->PutFreeConn(pConn);
}

void CLibEvent::CloseConn(Conn *pConn)
{
	CloseConn(pConn,emFunClosed);
}

void CLibEvent::DoError(struct bufferevent *bev, short error, void *ctx)
{
	Conn *c=(Conn*)ctx;
	emFunID id=emFunNull;
	if (error&EVBUFFER_TIMEOUT) 
	{
		id=emFunTimeout;
	} else if (error&EVBUFFER_EOF)
	{
		id=emFunClosed;
	} else if (error&EVBUFFER_ERROR) 
	{
		id=emFunError;
	}
	CloseConn(c, id);
}

void CLibEvent::DoAccept(struct evconnlistener *listener, evutil_socket_t fd,struct sockaddr *sa, int socklen, void *user_data)
{
	//此处为监听线程的event.不做处理.
	Server *pServer = (Server *)user_data;
	//主线程处做任务分发.
	int nCurrent=pServer->nCurrentWorker++%pServer->workernum;
	//当前线程所在ID号
	Worker &pWorker=pServer->pWorker[nCurrent];
	//通知线程开始读取数据,用于分配哪一个线程来处理此处的event事件
	Conn *pConn=pWorker.GetFreeConn();
	if (pConn==NULL)
	{
		return;
	}	 
	pConn->fd=fd;
	evutil_make_socket_nonblocking(pConn->fd);
	bufferevent_setfd(pConn->bufev, pConn->fd);
	//转发发送事件
	CLibEventFunction::DispatchFunction(emFunConnected,pConn);
	bufferevent_enable(pConn->bufev, EV_READ | EV_WRITE);
}

DWORD WINAPI CLibEvent::ThreadServer(LPVOID lPVOID)
{
	Server * pServer=reinterpret_cast(lPVOID);
	if (pServer==NULL)
	{
		return -1;
	}
	event_base_dispatch(pServer->pBase);
	return GetCurrentThreadId();
}

DWORD WINAPI CLibEvent::ThreadWorkers(LPVOID lPVOID)
{
	Worker *pWorker=reinterpret_cast(lPVOID);
	if (pWorker==NULL)
	{
		return -1;
	}
	event_base_dispatch(pWorker->pWokerbase);
	return GetCurrentThreadId();
}

void CLibEvent::LoadFuns()
{
	CLibEventFunction::RegistFunc(emFunLogin,CLibUserFunction::Login);
	CLibEventFunction::RegistFunc(emFunLogout,CLibUserFunction::Logout);
}