MyWebServer开发日记-socket

打算把 tinyWebServer 重写成跨平台（Windows and Linux）的。

这里首先需要跨平台的 sokcet，主要参考 尹圣雨 的 TCP/IP 网络编程 来着：

代码写的有些笨，欢迎批评：

首先是一个 socket 类，主要封装了 常用操作，通过宏定义分别针对 Linux 和 Windows 处理 ：

#ifndef _SOCKET_H_
#define _SOCKET_H_#ifdef _WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
#endif#include <cstdio>
#include <cstring>
#include <cstdlib>#include <iostream>
#include <sstream>
#include <exception>
#include <stdexcept>
#include <string>#ifdef _WIN32using socklen_t = int;
#elseusing SOCKET = int; //文件描述符static constexpr int INVALID_SOCKET  = -1; static constexpr int SOCKET_ERROR = -1;
#endifclass Socket {public:Socket():Socket(PF_INET,SOCK_STREAM,IPPROTO_TCP){}Socket(int domain, int type, int protocal);Socket(SOCKET socket): m_socket(socket){}~Socket() noexcept;void bind(sockaddr *addr, socklen_t addrlen);void listen(int queueLen= 5);Socket accept(sockaddr *addr, socklen_t *addrlen);void connect(sockaddr *addr, socklen_t len);SOCKET getSocket() { return m_socket; }private:SOCKET m_socket;
};class WinSockMgr {
public:static WinSockMgr *getInstance() {static WinSockMgr instance;return &instance;}
private:WinSockMgr();~WinSockMgr() noexcept;
};#endif

这里 WinSockMgr 主要用来管理 WinSock 的一些启动销毁工作。

然后是实现，这里直接报错就抛异常：

#include "socket.h"namespace {
#ifdef _WIN32WinSockMgr* winSockMgr = WinSockMgr::getInstance();
#endif
}std::string getErrorStr(const char *str) 
{std::ostringstream errStr;errStr << str << " with errno [" << errno << "]";return errStr.str();
}Socket::Socket(int domain, int type, int protocal) try //这里的 try 纯属多此一举
{m_socket = socket(domain,type,protocal);if (INVALID_SOCKET == m_socket) {std::string errStr = getErrorStr("socket() failed!");std::cerr << errStr << std::endl;throw std::runtime_error(errStr);}
} catch(const std::runtime_error& e) {throw;
}Socket::~Socket()
{
#ifdef _WIN32if (0 != closesocket(m_socket)) {std::cerr << "closesocket() failed!" << std::endl;}
#elseclose(m_socket);
#endif
}void Socket::bind(sockaddr *addr,socklen_t len)
{if (0 != ::bind(m_socket,addr,len)) {std::string errStr = getErrorStr("bind() failed!");std::cerr << errStr << std::endl;throw std::runtime_error(errStr);}
}// queueLen = 5
void Socket::listen(int queueLen)
{// 第二个参数是 请求等待的数量if (0 != ::listen(m_socket,queueLen)) {std::string errStr = getErrorStr("listen() failed!");std::cerr << errStr << std::endl;throw std::runtime_error(errStr);}
}Socket Socket::accept(sockaddr *addr, socklen_t *addrlen)
{SOCKET socket = ::accept(m_socket,addr,addrlen);if (INVALID_SOCKET == socket) {std::string errStr = getErrorStr("accept() failed!");std::cerr << errStr << std::endl;throw std::runtime_error(errStr);}return Socket{socket};
}void Socket::connect(sockaddr *addr, socklen_t addrlen)
{if (SOCKET_ERROR == ::connect(m_socket,addr,addrlen)) {std::string errStr = getErrorStr("connect() failed!");std::cerr << errStr << std::endl;throw std::runtime_error(errStr);}
}WinSockMgr::WinSockMgr() {
#ifdef _WIN32WSADATA wsaData;int ret = WSAStartup(MAKEWORD(2,2),&wsaData);if (ret != 0) {std::string errStr = getErrorStr("WSAStartup() failed!");std::cerr << errStr << "with return: [" << ret << "]" << std::endl;throw std::runtime_error(errStr);}
#endif
}WinSockMgr::~WinSockMgr() {
#ifdef _WIN32if (0 != WSACleanup()) {std::string errStr = getErrorStr("WSACleanup() failed!");std::cerr << errStr << std::endl;}
#endif
}

代码写的不够简洁，还需要修改，但是先这样吧。

主要是简单的封装，也没啥好讲的。