【在Linux世界中追寻伟大的One Piece】Socket编程UDP(续)

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UdpServer.hpp

#pragma once
#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <unistd.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <functional>
#include <pthread.h>
#include "nocopy.hpp"
#include "Log.hpp"
#include "Comm.hpp"
#include "InetAddr.hpp"
#include "ThreadPool.hpp"
<p>const static uint16_t defaultport = 8888;
const static int defaultfd = -1;
const static int defaultsize = 1024;</p><p>using task_t = std::function<void()>;</p><p>class UdpServer : public nocopy {
public:
UdpServer(uint16_t port = defaultport) : _port(port), _sockfd(defaultfd) {
pthread_mutex_init(&_user_mutex, nullptr);
}</p><pre class="brush:php;toolbar:false;">void Init() {
    // 1. 创建 socket，就是创建了文件描述符
    _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (_sockfd < 0) {
        lg.LogMessage(Error, "socket error: %s\n", strerror(errno));
        return;
    }

    // 2. 绑定
    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(_port);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(_sockfd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
        lg.LogMessage(Error, "bind error: %s\n", strerror(errno));
        close(_sockfd);
        return;
    }

    // 3. 初始化线程池
    ThreadPool<task_t>::GetInstance()->Start();
}

void AddOnlineUser(InetAddr addr) {
    LockGuard lockguard(&_user_mutex);
    for (auto& user : _online_user) {
        if (addr == user) return;
    }
    _online_user.push_back(addr);
    lg.LogMessage(Debug, "%s:%d is add to online user list...\n", addr.Ip().c_str(), addr.Port());
}

void Route(int sock, const std::string& message) {
    LockGuard lockguard(&_user_mutex);
    for (auto& user : _online_user) {
        sendto(sock, message.c_str(), message.size(), 0, (struct sockaddr*)&user.GetAddr(), sizeof(user.GetAddr()));
        lg.LogMessage(Debug, "server send message to %s:%d, message: %s\n", user.Ip().c_str(), user.Port(), message.c_str());
    }
}

void Start() {
    // 服务器永远不退出
    char buffer[defaultsize];
    for (;;) {
        struct sockaddr_in peer;
        socklen_t len = sizeof(peer); // 不能乱写
        ssize_t n = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr*)&peer, &len);
        if (n > 0) {
            InetAddr addr(peer);
            AddOnlineUser(addr);
            buffer[n] = 0;
            std::string message = "[";
            message += addr.Ip();
            message += ":";
            message += std::to_string(addr.Port());
            message += "]# ";
            message += buffer;
            task_t task = std::bind(&UdpServer::Route, this, _sockfd, message);
            ThreadPool<task_t>::GetInstance()->Push(task);
        }
    }
}

private: uint16_t _port; int _sockfd; std::vector _online_user; // 会被多个线程同时访问的 pthread_mutex_t _user_mutex; };

引入线程池

InetAddr.hpp

#pragma once</p><h1>include <iostream></h1><h1>include <string></h1><h1>include <sys/types.h></h1><h1>include <sys/socket.h></h1><h1>include <netinet/in.h></h1><h1>include <arpa/inet.h></h1><p>class InetAddr {
public:
InetAddr(struct sockaddr_in& addr) : _addr(addr) {
_port = ntohs(_addr.sin_port);
_ip = inet_ntoa(_addr.sin_addr);
}</p><pre class="brush:php;toolbar:false;">std::string Ip() { return _ip; }
uint16_t Port() { return _port; }

std::string PrintDebug() {
    std::string info = _ip;
    info += ":";
    info += std::to_string(_port); // "127.0.0.1:4444"
    return info;
}

const struct sockaddr_in& GetAddr() {
    return _addr;
}

bool operator == (const InetAddr& addr) {
    return this->_ip == addr._ip && this->_port == addr._port;
}

~InetAddr() {}

private: std::string _ip; uint16_t _port; struct sockaddr_in _addr; };

在InetAddr中，重载一下==方便对用户是否是同一个进行比较。

UdpClient.hpp

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#include <iostream></p><h1>include <cerrno></h1><h1>include <cstring></h1><h1>include <string></h1><h1>include <unistd.h></h1><h1>include <sys/types.h> /<em> See NOTES </em>/</h1><h1>include <sys/socket.h></h1><h1>include <arpa/inet.h></h1><h1>include <netinet/in.h></h1><h1>include "Thread.hpp"</h1><h1>include "InetAddr.hpp"</h1><p>void Usage(const std::string& process) {
std::cout << "Usage: " << process << " ip port" << std::endl;
exit(1);
}</p><p>void<em> RecverRoutine(void</em> arg) {
threaddata<em> td = static_cast<threaddata</em>>(arg);
int sock = td->sockfd;
char buffer[1024];
for (;;) {
struct sockaddr_in peer;
socklen_t len = sizeof(peer);
ssize_t n = recvfrom(sock, buffer, sizeof(buffer) - 1, 0, (struct sockaddr*)&peer, &len);
if (n > 0) {
buffer[n] = 0;
std::cerr << "recv: " << buffer << std::endl;
}
}
return nullptr;
}</p><p>void<em> SenderRoutine(void</em> arg) {
threaddata<em> td = static_cast<threaddata</em>>(arg);
int sock = td->sockfd;
struct sockaddr_in peer = td->peer;
char buffer[1024];
for (;;) {
std::cin.getline(buffer, sizeof(buffer));
sendto(sock, buffer, strlen(buffer), 0, (struct sockaddr*)&peer, sizeof(peer));
}
return nullptr;
}</p><p>int main(int argc, char* argv[]) {
if (argc != 3) {
Usage(argv[0]);
}</p><pre class="brush:php;toolbar:false;">int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
    std::cerr << "socket error: " << strerror(errno) << std::endl;
    exit(2);
}

struct sockaddr_in peer;
memset(&peer, 0, sizeof(peer));
peer.sin_family = AF_INET;
peer.sin_port = htons(atoi(argv[2]));
peer.sin_addr.s_addr = inet_addr(argv[1]);

threaddata td;
td.sockfd = sock;
td.peer = peer;

Thread<threaddata> recver("recver", RecverRoutine, td);
Thread<threaddata> sender("sender", SenderRoutine, td);
recver.Start();
sender.Start();
recver.Join();
sender.Join();
close(sock);
return 0;

}

UDP协议支持全双工，一个sockfd，既可以读取，又可以写入，对于客户端和服务端同样如此。多线程客户端，同时读取和写入。测试的时候，使用管道进行演示。

感谢各位大佬支持！！！

互三啦！！！

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