UDP -- 简易聊天室

gitee（内有详细代码）

图解

MessageRoute.hpp

UdpClient.hpp

UdpServer.hpp

Main.hpp

运行结果（本地通信）

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gitee（内有详细代码）

chat_room · zihuixie/Linux_Learning - 码云 - 开源中国https://gitee.com/zihuixie/linux_-learning/tree/master/chat_room

图解

MessageRoute.hpp

#pragma once
#include <iostream>
#include <vector>
#include <string>
#include <vector>
#include <sys/types.h>
#include <sys/socket.h>
#include <functional>
#include "InetAddr.hpp"
#include "ThreadPool.hpp"
#include "LockGuard.hpp"// 通信模块：实现消息的转发
//只要有人发消息，就把该消息转发给所有的在线用户using task_t =std::function<void()>;class MessageRoute
{
private:// 判断地址是否已保存数组中bool IsExists(const InetAddr &addr){for (auto a : _online_user){if (a == addr)return true;}return false;}public:MessageRoute(){pthread_mutex_init(&_mutex,nullptr);}~MessageRoute(){pthread_mutex_destroy(&_mutex);}// 添加用户void Adduser(const InetAddr &addr){LockGuard lock(&_mutex);//保护数组临界资源// 已存在则不添加if (IsExists(addr))return;_online_user.push_back(addr);}// 删除用户void Deluser(const InetAddr &addr){LockGuard lock(&_mutex);//保护数组临界资源// 不存在该用户，不需要删除if (!IsExists(addr))return;// 用迭代器删除for (auto iter = _online_user.begin(); iter != _online_user.end(); iter++){if (*iter == addr){_online_user.erase(iter);break;}}}//转发消息void RouteHelper(int sockfd,std::string message,InetAddr who){LockGuard lock(&_mutex);for(auto user:_online_user){//设置要发送的消息std::string send_message ="\n["+who.Ip()+":"+std::to_string(who.Port())+"]# "+message+"\n";struct sockaddr_in clientaddr=user.Addr();::sendto(sockfd,send_message.c_str(),send_message.size(),0,(struct sockaddr*)&clientaddr,sizeof(clientaddr));}}//通信模块//哪个套接字，发了什么消息，谁发的void Route(int sockfd,std::string message,InetAddr who){Adduser(who);//该用户要退出，删除该用户if(message=="Q" || message=="QUIT")Deluser(who);task_t t=std::bind(&MessageRoute::RouteHelper,this,sockfd,message,who);//让线程池来转发ThreadPool<task_t>::GetInstance()->Enqueue(t);}
private:pthread_mutex_t _mutex;std::vector<InetAddr> _online_user; // 用数组存储在线用户(用地址代表用户)
};

UdpClient.hpp

#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Thread.hpp"using namespace ThreadModule;void Usage(std::string proc)
{std::cout << "Usage:\n\t" << proc << " serverip serverport\n"<< std::endl;
}int InitClient(std::string &serverip, uint16_t serverport, struct sockaddr_in *server)
{int sockfd = socket(AF_INET, SOCK_DGRAM, 0);if (sockfd < 0){std::cerr << "socket error" << std::endl;return -1;}// 初始化地址memset(server, 0, sizeof(struct sockaddr_in));server->sin_family = AF_INET;server->sin_port = htons(serverport);server->sin_addr.s_addr = inet_addr(serverip.c_str());return sockfd;
}// 接收消息
void recvmessage(int sockfd, std::string name)
{while (true){// 发送方的地址struct sockaddr_in peer;socklen_t len = sizeof(peer);char buffer[1024];// 获取接收方的地址ssize_t n = recvfrom(sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&peer, &len);if (n > 0){buffer[n] = 0;//向标准错误中输出（标准错误也是个文件描述符）fprintf(stderr, "[%s]%s\n", name.c_str(), buffer);}}
}void sendmessage(int sockfd, struct sockaddr_in &server, std::string name)
{std::string message;while (true){printf("%s | Enter# ", name.c_str());fflush(stdout);std::getline(std::cin, message);// 传接收方的地址sendto(sockfd, message.c_str(), sizeof(message), 0, (struct sockaddr *)&server, sizeof(server));}
}int main(int argc, char *argv[])
{if (argc != 3){Usage(argv[0]);exit(1);}//填充地址struct sockaddr_in serveraddr;std::string serverip = argv[1];uint16_t serverport = std::stoi(argv[2]);int sockfd = InitClient(serverip, serverport, &serveraddr);if (sockfd == -1){return 1;}//定义函数并绑定参数func_t r = std::bind(&recvmessage, sockfd, std::placeholders::_1);func_t s = std::bind(&sendmessage, sockfd, serveraddr, std::placeholders::_1);//创建两个线程：发消息 && 收消息//就可以同时实现收消息 && 发消息 -- 全双工//如果收消息 和 发消息 都由一个线程实现 -- 半双工Thread Recver(r, "recver");Thread Sender(s, "sender");//启动线程Recver.Start();Sender.Start();Recver.Join();Sender.Join();return 0;
}

UdpServer.hpp

#pragma once#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <functional>
#include "InetAddr.hpp"
#include "Log.hpp"enum
{SOCKET_ERROR = 1, // 套接字创建失败BIND_ERROR,       // 绑定失败USAGE_ERROR       // 用法错误
};const static int defaultfd = -1; // 默认描述符的值为-1// 接收任务
using hander_message_t = std::function<void(int sockfd, const std::string message, const InetAddr who)>;class UdpServer
{
public:// 外界需要传端口号UdpServer(uint16_t port, hander_message_t hander_message): _port(port), _sockfd(defaultfd), _isrunning(false), _hander_message(hander_message){}void InitServer(){// 创建套接字_sockfd = socket(AF_INET, SOCK_DGRAM, 0);if (_sockfd < 0) // 创建失败{LOG(FATAL, "socket error, %s, %d\n", strerror(errno), errno);exit(SOCKET_ERROR);}LOG(INFO, "socket create success, sockfd: %d\n", _sockfd);// 填 sockaddr_instruct sockaddr_in local;     // 在栈上开辟空间bzero(&local, sizeof(local)); // 将内存设置为全0local.sin_family = AF_INET;         // 协议族（用哪个协议）local.sin_port = htons(_port);      // 端口号，转为网络序列（大端）local.sin_addr.s_addr = INADDR_ANY; // IP地址（任意地址）int n = bind(_sockfd, (struct sockaddr *)&local, sizeof(local));// 绑定失败if (n < 0){LOG(FATAL, "bind error,%s,%d\n", strerror(errno), errno);exit(BIND_ERROR);}LOG(INFO, "socket bind success\n");}// 启动服务器，服务器只接收信息和做应答void Start(){_isrunning = true;while (true){char message[1024];struct sockaddr_in peer; // 发送方的地址socklen_t len = sizeof(peer);// 接收数据报，返回值为接收到的字节数ssize_t n = recvfrom(_sockfd, message, sizeof(message) - 1, 0, (struct sockaddr *)&peer, &len);if (n > 0){message[n] = 0;InetAddr addr(peer); // 发送方的IP和端口号LOG(DEBUG, "get message from [%s:%d]:%s\n", addr.Ip().c_str(), addr.Port(), message);//转发消息_hander_message(_sockfd,message,addr);}_isrunning = false;}}~UdpServer(){}private:int _sockfd;uint16_t _port;bool _isrunning;hander_message_t _hander_message;
};

Main.hpp

#include<iostream>
#include<memory>
#include"UdpServer.hpp"
#include"MessageRoute.hpp"void Usage(std::string proc)
{std::cout<<"Usage:\n\t"<<proc<<" local_port\n"<<std::endl;
}int main(int argc,char* argv[])
{if(argc!=2){Usage(argv[0]);exit(USAGE_ERROR);}EnableScreen();MessageRoute route;//创建一个实例uint16_t port=std::stoi(argv[1]);std::unique_ptr<UdpServer> usvr=std::make_unique<UdpServer>(port,std::bind(&MessageRoute::Route,&route,std::placeholders::_1,std::placeholders::_2,std::placeholders::_3));usvr->InitServer();usvr->Start();return 0;}