将ecshop中的session机制重写,从DB移植到Memcache中去

来源:互联网 发布:王震对新疆的功过知乎 编辑:程序博客网 时间:2024/04/19 03:56
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<?php
 
if(!defined('IN_ECS'))
{
    die('Hacking attempt');
}
 
/*------------------------------------------------------ */
//-- 该类用于将SESSION直接写入Memcache
/*------------------------------------------------------ */
classcls_session
{
    var$db             = NULL;
 
    var$max_life_time  = 1800; // SESSION 过期时间
 
    var$session_name   = '';
    var$session_id     = '';
 
    var$session_expiry = '';
    var$session_md5    = '';
 
    var$session_cookie_path   = '/';
    var$session_cookie_domain = '';
    var$session_cookie_secure = false;
 
    var$_ip   = '';
    var$_time = 0;
 
    function__construct(&$db,$session_table,$session_data_table,$session_name= 'ECS_ID',$session_id= '')
    {
        $m= newMemcache;
        $m->addServer('127.0.0.1', 11211);
        $this->cls_session($m,$session_name,$session_id);
    }
 
    functioncls_session(&$db,$session_name= 'ECS_ID',$session_id= '')
    {
        $GLOBALS['_SESSION'] = array();
 
        if(!empty($GLOBALS['cookie_path']))
        {
            $this->session_cookie_path = $GLOBALS['cookie_path'];
        }
        else
        {
            $this->session_cookie_path = '/';
        }
 
        if(!empty($GLOBALS['cookie_domain']))
        {
            $this->session_cookie_domain = $GLOBALS['cookie_domain'];
        }
        else
        {
            $this->session_cookie_domain = '';
        }
 
        if(!empty($GLOBALS['cookie_secure']))
        {
            $this->session_cookie_secure = $GLOBALS['cookie_secure'];
        }
        else
        {
            $this->session_cookie_secure = false;
        }
      
        $this->session_name       = $session_name;
 
        $this->db  = &$db;
        $this->_ip = real_ip();
 
        if($session_id== ''&& !empty($_COOKIE[$this->session_name]))
        {
            $this->session_id = $_COOKIE[$this->session_name];
        }
        else
        {
            $this->session_id = $session_id;
        }
 
        if($this->session_id)
        {
            $tmp_session_id= substr($this->session_id, 0, 32);
            if($this->gen_session_key($tmp_session_id) == substr($this->session_id, 32))
            {
                $this->session_id = $tmp_session_id;
            }
            else
            {
                $this->session_id = '';
            }
        }
 
        $this->_time = time();
 
        if($this->session_id)
        {
            $this->load_session();
        }
        else
        {
            $this->gen_session_id();
            setcookie($this->session_name,$this->session_id . $this->gen_session_key($this->session_id), 0, $this->session_cookie_path,$this->session_cookie_domain,$this->session_cookie_secure);
        }
        register_shutdown_function(array(&$this,'close_session'));
    }
 
    functiongen_session_id()
    {
        $this->session_id = md5(uniqid(mt_rand(), true));
 
        return$this->insert_session();
    }
 
    functiongen_session_key($session_id)
    {
        static$ip = '';
 
        if($ip== '')
        {
            $ip= substr($this->_ip, 0, strrpos($this->_ip,'.'));
        }
 
        returnsprintf('%08x', crc32(!empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] . ROOT_PATH . $ip. $session_id: ROOT_PATH . $ip. $session_id));
    }
 
    functioninsert_session()
    {
        return$this->db->set($this->session_id,array('expiry'=>$this->_time,'ip'=>$this->_ip,'data'=>'a:0:{}'), false, $this->max_life_time);
    }
 
    functionload_session()
    {
        $session= $this->db->get($this->session_id);
        if(empty($session))
        {
            $this->insert_session();
            $this->session_expiry = 0;
            $this->session_md5 = '40cd750bba9870f18aada2478b24840a';
            $GLOBALS['_SESSION'] = array();
        }
        else
        {
            if(!empty($session['data']) && $this->_time - $session['expiry'] <= $this->max_life_time)
            {
                $this->session_expiry = $session['expiry'];
                $this->session_md5 = md5($session['data']);
                $GLOBALS['_SESSION']  = unserialize(stripslashes($session['data']));
            }
            else
            {
                $this->session_expiry = 0;
                $this->session_md5 = '40cd750bba9870f18aada2478b24840a';
                $GLOBALS['_SESSION']  = array();
            }
        }
    }
 
    functionupdate_session()
    {
        $adminid= !empty($GLOBALS['_SESSION']['admin_id']) ? intval($GLOBALS['_SESSION']['admin_id']) : 0;
        $userid = !empty($GLOBALS['_SESSION']['user_id'])  ? intval($GLOBALS['_SESSION']['user_id'])  : 0;
 
        $data= serialize($GLOBALS['_SESSION']);
        $this->_time = time();
 
        if($this->session_md5 == md5($data) && $this->_time < $this->session_expiry + 10)
        {
            returntrue;
        }
 
        $data= addslashes($data);
 
        return$this->db->replace($this->session_id,array('expiry'=>$this->_time,'ip'=>$this->_ip,'userid'=>$userid,'adminid'=>$adminid,'data'=>$data), false, $this->max_life_time);
    }
 
    functionclose_session()
    {
        $this->update_session();
        returntrue;
    }
 
    functiondelete_spec_admin_session($adminid)
    {
        if(!empty($GLOBALS['_SESSION']['admin_id']) && $adminid)
        {
            $all_items= $this->db->getExtendedStats('items');
            $items= $all_items['127.0.0.1:11211']['items'];
            foreach($itemsas $key => $item) {
                if(isset($item['adminid'])) {
                    if($item['adminid'] == $adminid)return$this->db->delete($key);
                }
            }
        }
        else
        {
            returnfalse;
        }
    }
 
    functiondestroy_session()
    {   
        $GLOBALS['_SESSION'] = array();
 
        setcookie($this->session_name,$this->session_id, 1, $this->session_cookie_path,$this->session_cookie_domain,$this->session_cookie_secure);
 
        /* ECSHOP 自定义执行部分 */
        if(!empty($GLOBALS['ecs']))
        {
            $GLOBALS['db']->query('DELETE FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE session_id = '$this->session_id'");
        }
        /* ECSHOP 自定义执行部分 */
 
        return$this->db->delete($this->session_id);
    }
 
    functionget_session_id()
    {
        return$this->session_id;
    }
 
    functionget_users_count()
    {
        $all_items= $this->db->getExtendedStats();
        return$count = $all_items['127.0.0.1:11211']['curr_items'];//由于有其他key的缓存,因此这只是个接近数值
    }
 
}
 
?>
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