webserver.cpp

#include "webserver.h"

WebServer::WebServer()
{
    //http_conn类对象
    users = new http_conn[MAX_FD];

    //root文件夹路径
    char server_path[200];
    getcwd(server_path, 200);  //获取当前工作目录地址
    char root[6] = "/root";  //root文件夹
    m_root = (char *)malloc(strlen(server_path) + strlen(root) + 1);
    strcpy(m_root, server_path);
    strcat(m_root, root);
}

WebServer::~WebServer()
{
    close(m_epollfd);
    close(m_listenfd);
    close(m_pipefd[1]);
    close(m_pipefd[0]);
    delete[] users;
    delete m_pool;
}

void WebServer::init(int port, string user, string passWord, string databaseName, int log_write, 
                     int opt_linger, int trigmode, int sql_num, int thread_num, int close_log, int actor_model)
{
    m_port = port;  //端口
    m_user = user;  //登陆名
    m_passWord = passWord;  //密码
    m_databaseName = databaseName;  //数据库名
    m_sql_num = sql_num;  //数据库量
    m_thread_num = thread_num;  //线程数量
    m_log_write = log_write;   //日志写入方式
    m_OPT_LINGER = opt_linger;  //套接字关闭形式
    m_TRIGMode = trigmode;  //ET
    m_close_log = close_log;  //关闭日志
    m_actormodel = actor_model;  //并发模型
}

void WebServer::trig_mode()
{
    //监听+连接
    //LT + LT
    if (0 == m_TRIGMode)
    {
        m_LISTENTrigmode = 0;
        m_CONNTrigmode = 0;
    }
    //LT + ET
    else if (1 == m_TRIGMode)
    {
        m_LISTENTrigmode = 0;
        m_CONNTrigmode = 1;
    }
    //ET + LT
    else if (2 == m_TRIGMode)
    {
        m_LISTENTrigmode = 1;
        m_CONNTrigmode = 0;
    }
    //ET + ET
    else if (3 == m_TRIGMode)
    {
        m_LISTENTrigmode = 1;
        m_CONNTrigmode = 1;
    }
}

void WebServer::log_write()
{
    //日志未关
    if (0 == m_close_log)
    {
        //初始化日志
        if (1 == m_log_write)
        //异步日志
            Log::get_instance()->init("./ServerLog", m_close_log, 2000, 800000, 800);
        else
        //同步日志
            Log::get_instance()->init("./ServerLog", m_close_log, 2000, 800000, 0);
    }
}

//处理数据库
void WebServer::sql_pool()
{
    //初始化数据库连接池，饿汉模式
    m_connPool = connection_pool::GetInstance();
    //端口号，连接量，日志关闭
    m_connPool->init("localhost", m_user, m_passWord, m_databaseName, 3306, m_sql_num, m_close_log);

    //初始化数据库读取表，取出数据库中的用户名与密码
    users->initmysql_result(m_connPool);
}

void WebServer::thread_pool()
{
    //创建线程池。数据库连接池与其中的线程数量
    m_pool = new threadpool(m_actormodel, m_connPool, m_thread_num);
}

void WebServer::eventListen()
{
    //网络编程基础步骤
    m_listenfd = socket(PF_INET, SOCK_STREAM, 0);  //PF=AF，ipv4,TCP流式套接字
    assert(m_listenfd >= 0);

    //强制断开
    if (0 == m_OPT_LINGER)
    {
        struct linger tmp = {0, 1};  //不延时关闭
        //设置套接字，套接字层次（通用/tcp/ip),套接字选项（延迟关闭），新选项值，长度
        setsockopt(m_listenfd, SOL_SOCKET, SO_LINGER, &tmp, sizeof(tmp));
    }
    //优雅断开
    else if (1 == m_OPT_LINGER)
    {
        //前为开关，关闭则发送完断开，后为时间，限制发送时间
        struct linger tmp = {1, 1};  //延时1s关闭
        setsockopt(m_listenfd, SOL_SOCKET, SO_LINGER, &tmp, sizeof(tmp));
    }

    int ret = 0;
    struct sockaddr_in address;
    bzero(&address, sizeof(address));
    address.sin_family = AF_INET;  //ipv4
    address.sin_addr.s_addr = htonl(INADDR_ANY); //本机网卡ip地址
    address.sin_port = htons(m_port);  //端口

    int flag = 1;
    //使这个套接字可与使用中的端口绑定
    setsockopt(m_listenfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
    ret = bind(m_listenfd, (struct sockaddr *)&address, sizeof(address));
    assert(ret >= 0);
    ret = listen(m_listenfd, 5);  //完成连接但服务器未处理的请求数
    assert(ret >= 0);

    utils.init(TIMESLOT);

    //epoll创建内核事件表
    epoll_event events[MAX_EVENT_NUMBER];
    m_epollfd = epoll_create(5);  //创建5个监听
    assert(m_epollfd != -1);

    //添加事件
    utils.addfd(m_epollfd, m_listenfd, false, m_LISTENTrigmode);
    http_conn::m_epollfd = m_epollfd;

    //创建相互绑定的套接字
    ret = socketpair(PF_UNIX, SOCK_STREAM, 0, m_pipefd);
    assert(ret != -1);
    utils.setnonblocking(m_pipefd[1]);  //设置非阻塞
    utils.addfd(m_epollfd, m_pipefd[0], false, 0);

    utils.addsig(SIGPIPE, SIG_IGN);  //忽略管道通信冲突问题
    utils.addsig(SIGALRM, utils.sig_handler, false);  //计时
    utils.addsig(SIGTERM, utils.sig_handler, false);  //中断

    alarm(TIMESLOT);

    //工具类,信号和描述符基础操作
    Utils::u_pipefd = m_pipefd;
    Utils::u_epollfd = m_epollfd;
}


void WebServer::timer(int connfd, struct sockaddr_in client_address)
{
    users[connfd].init(connfd, client_address, m_root, m_CONNTrigmode, m_close_log, m_user, m_passWord, m_databaseName);

    //初始化client_data数据
    //创建定时器，设置回调函数和超时时间，绑定用户数据，将定时器添加到链表中
    // users_timer[connfd].address = client_address;
    util_timer *timer = new util_timer;
    timer->sockfd = connfd;
    timer->cb_func = cb_func;
    time_t cur = time(NULL);
    timer->expire = cur + 3 * TIMESLOT;  //超时时间为3倍slot
    users_timer[connfd] = timer;
    utils.m_timer_lst.add_timer(timer);
}

//若有数据传输，则将定时器往后延迟3个单位
//并对新的定时器在链表上的位置进行调整
void WebServer::adjust_timer(util_timer *timer)
{
    time_t cur = time(NULL);
    timer->expire = cur + 3 * TIMESLOT;
    utils.m_timer_lst.adjust_timer(timer);

    LOG_INFO("%s", "adjust timer once");
}

void WebServer::deal_timer(util_timer *timer, int sockfd)
{
    //删掉这个监听描述符
    timer->cb_func(sockfd);
    if (timer)
    {
        utils.m_timer_lst.del_timer(timer);
    }

    LOG_INFO("close fd %d", sockfd);
}

//处理连接
bool WebServer::dealclinetdata()
{
    struct sockaddr_in client_address;
    socklen_t client_addrlength = sizeof(client_address);
    if (0 == m_LISTENTrigmode)  //LT
    {
        int connfd = accept(m_listenfd, (struct sockaddr *)&client_address, &client_addrlength);
        if (connfd < 0)
        {
            LOG_ERROR("%s:errno is:%d", "accept error", errno);
            return false;
        }
        if (http_conn::m_user_count >= MAX_FD)
        {
            utils.show_error(connfd, "Internal server busy");
            LOG_ERROR("%s", "Internal server busy");
            return false;
        }
        timer(connfd, client_address);
    }
    else  //ET
    {
        while (1)
        {
            int connfd = accept(m_listenfd, (struct sockaddr *)&client_address, &client_addrlength);
            if (connfd < 0)
            {
                LOG_ERROR("%s:errno is:%d", "accept error", errno);
                break;
            }
            if (http_conn::m_user_count >= MAX_FD)
            {
                utils.show_error(connfd, "Internal server busy");
                LOG_ERROR("%s", "Internal server busy");
                break;
            }
            timer(connfd, client_address);
        }
        return false;
    }
    return true;
}

//检测是否有超时或中断信号
bool WebServer::dealwithsignal(bool &timeout, bool &stop_server)
{
    int ret = 0;
    int sig;
    char signals[1024];
    ret = recv(m_pipefd[0], signals, sizeof(signals), 0);  //读取信号
    if (ret == -1)
    {
        return false;
    }
    else if (ret == 0)
    {
        return false;
    }
    else
    {
        for (int i = 0; i < ret; ++i)
        {
            switch (signals[i])
            {
                //超时事件
                case SIGALRM:
                {
                    timeout = true;
                    break;
                }
                //服务器关闭事件
                case SIGTERM:
                {
                    stop_server = true;
                    break;
                }
            }
        }
    }
    return true;
}

void WebServer::dealwithread(int sockfd)
{
    util_timer *timer = users_timer[sockfd];

    //reactor
    if (1 == m_actormodel)
    {
        if (timer)
        {
            adjust_timer(timer);
        }

        //若监测到读事件，将该事件放入请求队列
        m_pool->append(users + sockfd, 0);   //0为读
        while (true)
        {
            if (1 == users[sockfd].improv)
            {
                if (1 == users[sockfd].timer_flag)
                {
                    deal_timer(timer, sockfd);
                    users[sockfd].timer_flag = 0;
                }
                users[sockfd].improv = 0;
                break;
            }
        }
    }
    else
    {
        //proactor
        //主线程负责读
        if (users[sockfd].read_once())
        {
            LOG_INFO("deal with the client(%s)", inet_ntoa(users[sockfd].get_address()->sin_addr));
            //若监测到读事件，将该事件放入请求队列
            m_pool->append_p(users + sockfd);

            if (timer)
            {
                adjust_timer(timer);
            }
        }
        else
        {
            deal_timer(timer, sockfd);
        }
    }
}

void WebServer::dealwithwrite(int sockfd)
{
    util_timer *timer = users_timer[sockfd];
    //reactor
    if (1 == m_actormodel)
    {
        if (timer)
        {
            adjust_timer(timer);
        }
        //添加该事件
        m_pool->append(users + sockfd, 1);

        while (true)
        {
            if (1 == users[sockfd].improv)
            {
                if (1 == users[sockfd].timer_flag)
                {
                    deal_timer(timer, sockfd);
                    users[sockfd].timer_flag = 0;
                }
                users[sockfd].improv = 0;
                break;
            }
        }
    }
    else
    {
        //proactor
        if (users[sockfd].write())
        {
            LOG_INFO("send data to the client(%s)", inet_ntoa(users[sockfd].get_address()->sin_addr));

            if (timer)
            {
                adjust_timer(timer);
            }
        }
        else
        {
            deal_timer(timer, sockfd);
        }
    }
}

void WebServer::eventLoop()
{
    bool timeout = false;
    bool stop_server = false;

    //没关闭服务器
    while (!stop_server)
    {
        //非阻塞监听
        int number = epoll_wait(m_epollfd, events, MAX_EVENT_NUMBER, -1);
        if (number < 0 && errno != EINTR)
        {
            LOG_ERROR("%s", "epoll failure");
            break;
        }

        for (int i = 0; i < number; i++)
        {
            int sockfd = events[i].data.fd;

            //处理新到的客户连接
            if (sockfd == m_listenfd)
            {
                bool flag = dealclinetdata();
                if (false == flag)
                    continue;
            }
            else if (events[i].events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR))  //描述符挂断|出错
            {
                //服务器端关闭连接，移除对应的定时器
                util_timer *timer = users_timer[sockfd];
                deal_timer(timer, sockfd);
            }
            //管道接收到事件
            else if ((sockfd == m_pipefd[0]) && (events[i].events & EPOLLIN))
            {
                bool flag = dealwithsignal(timeout, stop_server);
                if (false == flag)
                    LOG_ERROR("%s", "dealclientdata failure");
            }
            //处理客户连接上接收到的数据
            else if (events[i].events & EPOLLIN)
            {
                dealwithread(sockfd);
            }
            //处理写数据
            else if (events[i].events & EPOLLOUT)
            {
                dealwithwrite(sockfd);
            }
        }
        //如果出现超时
        if (timeout)
        {
            utils.timer_handler();

            LOG_INFO("%s", "timer tick");

            timeout = false;
        }
    }
}