epoll+线程池封装

最新推荐文章于 2024-08-25 19:50:03 发布

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最新推荐文章于 2024-08-25 19:50:03 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/imsjw/article/details/88381439

本文介绍了一个名为dwsocket的网络通信库，它使用C++编写，实现了完全异步的服务端Socket，利用epoll进行事件监听，支持多线程处理连接请求，并通过任务队列分配工作。文章详细展示了dwsocket的类结构，包括Addr类用于存储地址信息，Socket类用于基本的套接字操作，ServerSocket类用于创建服务端套接字并监听连接，以及Socket类的派生类ClientSocket用于客户端套接字操作。

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dwsocket.h

#pragma once

#include <string>
#include <sys/epoll.h>
#include <pthread.h>
#include<condition_variable>
#include <queue>
#include<stdlib.h>

namespace dw
{

	using namespace std;

	class Addr
	{
	public:
		uint16_t port;
		string ip;
	public:
		Addr(string ip, uint16_t port);
		Addr();
		~Addr();
		friend ostream& operator<<(ostream &out, const Addr &addr);
	private:
	};

	class Socket
	{
	public:
		int socketFd;
	public:
		Socket();
		~Socket();
		int read(void *data);
	private:
	};

	typedef void(*ServerSocketCallBack)(Socket*);

	/*
	 * 服务端Socket 完全异步
	 */
	class ServerSocket
	{
	public:
		Addr *addr = NULL;
		int maxListenNum = 128;//最大监听数,libevent也是128
		int epollSize = 65535;//epoll 的最大监听数
		int maxEvents = 1024;
		int maxThread = 1; //最大线程数(socket开启时,会会根据cpu核心数,重新初始化该值)
		ServerSocketCallBack callBack = NULL;
	public:
		ServerSocket(uint16_t port);
		~ServerSocket();
		int start();
	private:
		int socketfd = -1;
		int epollfd = -1;
		epoll_event* events;
		int *threadArry = NULL;
		queue<int> taskQueue; //任务队列
		mutex taskQueueLock; //任务队列锁,防止两个线程读取同一个socket
	private:
		void initAddr(uint16_t port);
		int initSocket();
		int initEpoll();
		void setNonBlock(int fd); //设置非阻塞socket
		void initMaxThread();
		void loopWait();
		void addSocketFd(int fd);
		int initThreadPool(); //初始化线程池
		static void * threadMain(void* arg);//线程主函数
	};

}

Addr.cpp

#include "dwsocket.h"

#include<iostream>

namespace dw
{

	Addr::Addr()
	{
	}

	Addr::Addr(string ip, uint16_t port)
	{
		this->port = port;
		this->ip = ip;
	}

	Addr::~Addr()
	{
	}

	ostream& operator<<(ostream &out, const Addr &addr)
	{
		out << addr.ip << ":" << addr.port;
		return out;
	}

}

ServerSocket.cpp

#include "dwsocket.h"

#include<iostream>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/sysinfo.h>
#include <unistd.h>

namespace dw
{

	using namespace std;

	ServerSocket::ServerSocket(uint16_t port)
	{
		initAddr(port);
		initMaxThread();
	}

	ServerSocket::~ServerSocket()
	{
		delete addr;

		if (threadArry != NULL) {
			for (int i = 0; i < maxThread; i++) {
				pthread_exit(&(threadArry[i]));
			}
		}

		shutdown(socketfd, SHUT_RDWR);
	}

	void ServerSocket::initMaxThread()
	{
		int cpuCoreNum = get_nprocs();
		maxThread = cpuCoreNum * 2;
	}

	void ServerSocket::initAddr(uint16_t port)
	{
		addr = new Addr("127.0.0.1", port);
	}

	int ServerSocket::initSocket()
	{
		if (maxListenNum <= 0)
		{
			cout << "Error: maxListenNum 必须大于0 " << endl;
			return -1;
		}

		socketfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (socketfd < 0)
		{
			cout << "Error: socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)" << endl;
			return -1;
		}

		//设置socket
		setNonBlock(socketfd);
		int opt = 1;
		setsockopt(socketfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

		struct sockaddr_in server_addr;
		server_addr.sin_family = AF_INET;
		server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
		server_addr.sin_port = htons(addr->port);

		int err = bind(socketfd, (struct sockaddr*) &server_addr, sizeof(server_addr));
		if (err < 0)
		{
			cout << "Error: bind(socketfd, (struct sockaddr*) &server_addr, sizeof(server_addr))" << endl;
			return -1;
		}

		err = listen(socketfd, maxListenNum);
		if (err < 0)
		{
			cout << "Error: listen(socketfd, maxListenNum)" << endl;
			return -1;
		}

		return 0;
	}

	void ServerSocket::setNonBlock(int fd)
	{
		int fl = fcntl(socketfd, F_GETFL);
		fcntl(socketfd, F_SETFL, fl | O_NONBLOCK);
	}

	int ServerSocket::initEpoll()
	{

		epollfd = epoll_create(epollSize);
		if (epollfd < 0)
		{
			cout << "Error: epoll_create(maxEvents)" << endl;
			return -1;
		}

		events = new epoll_event[maxEvents];
		addSocketFd(socketfd);

		return 0;
	}

	void ServerSocket::loopWait()
	{

		struct sockaddr_in clientaddr;
		socklen_t clilen = sizeof(clientaddr);

		while (1)
		{
			int num = epoll_wait(epollfd, events, maxEvents, -1); //返回活跃用户个数
			for (int i = 0; i < num; i++)
			{
				int connfd = -1;
				if (events[i].data.fd == socketfd)
				{
					cout << "有新用户连接" << endl;
					connfd = accept(socketfd, (struct sockaddr *) &clientaddr, &clilen);
					if (connfd < 0)
					{
						cout << "连接失败" << endl;
						continue;
					}
					setNonBlock(connfd);
				}
				else if (events[i].events&EPOLLIN)
				{
					cout << "有用户发送数据" << endl;
					if ((connfd = events[i].data.fd) < 0)
					{
						cout << "连接失败" << endl;
						continue;
					}
					taskQueueLock.lock();
					taskQueue.push(connfd);
					taskQueueLock.unlock();

				}
				else if (events[i].events&EPOLLOUT)
				{
					//以前的连接,有数据写出
					cout << "以前的连接 写出" << endl;
				}
				else
				{
					cout << "其他" << endl;
					continue;
				}
				addSocketFd(connfd);
			}
		}
	}

	void ServerSocket::addSocketFd(int fd)
	{
		struct epoll_event event;
		event.data.fd = fd;
		event.events = EPOLLIN | EPOLLET;
		epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
	}

	int ServerSocket::initThreadPool()
	{
		pthread_t threads[maxThread];
		threadArry = (int*)threads;

		for (int i = 0; i < maxThread; i++)
		{
			int ret = pthread_create(&threads[i], NULL, threadMain, this);
			if (ret < 0)
			{
				cout << "Error: initThreadPool()" << endl;
				return -1;
			}
		}
		return 0;
	}

	void * ServerSocket::threadMain(void* arg)
	{
		ServerSocket *socket = (ServerSocket*)arg;
		while (true)
		{
			int socketFd = 0;
			socket->taskQueueLock.lock();
			if (!socket->taskQueue.empty()) {
				socketFd = socket->taskQueue.front();
				socket->taskQueue.pop();
			}
			socket->taskQueueLock.unlock();

			if (socketFd <= 0)
			{
				usleep(100000);
			}
			else
			{
				Socket client;
				client.socketFd = socketFd;
				socket->callBack(&client);
			}
		}
		return NULL;
	}

	int ServerSocket::start()
	{
		if (callBack == NULL) {
			cout << "Error: callBack is NULL" << endl;
			return -1;
		}

		int err = initThreadPool();
		if (err < 0)
		{
			cout << "Error: initThreadPool()" << endl;
			return -1;
		}

		err = initSocket();
		if (err < 0)
		{
			cout << "Error: initSocket()" << endl;
			return -1;
		}

		err = initEpoll();
		if (err < 0)
		{
			cout << "Error: initEpoll()" << endl;
			return -1;
		}
		loopWait();
		return 0;
	}
}

Socket.cpp

#include "dwsocket.h"

namespace dw {

	Socket::Socket() {
	}

	Socket::~Socket() {
	}

	int Socket::read(void *data) {
		return -1;
	}

}

main.cpp

#include "dwsocket.h"
#include <iostream>

using namespace dw;
using namespace std;

void test(Socket *socket) {
	cout << "test 有用户连接进来" << endl;
	socket->read(NULL);
}

int main() {
	ServerSocket server(10000);

	static ServerSocketCallBack callback = test;
	server.callBack = callback;

	server.start();
	return 0;
}

编译时需要添加 -lpthread