将ecshop中的session从mysql移植到memcache的方法
时间：2014-02-28 12:00:03  点击: 来源：  作者：

将ecshop中的session机制重写,从DB移植到Memcache中去，经过测试绝对可用！
include下的cls_session.php

代码如下：

//


if (!defined('IN_ECS'))
{
die('Hacking attempt');
}

/*------------------------------------------------------ */
//-- 该类用于将SESSION直接写入Memcache
/*------------------------------------------------------ */
class cls_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 = new Memcache;
$m->addServer('127.0.0.1', 11211);
$this->cls_session($m, $session_name, $session_id);
}

function cls_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'));
}

function gen_session_id()
{
$this->session_id = md5(uniqid(mt_rand(), true));

return $this->insert_session();
}

function gen_session_key($session_id)
{
static $ip = '';

if ($ip == '')
{
$ip = substr($this->_ip, 0, strrpos($this->_ip, '.'));
}

return sprintf('%08x', crc32(!empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] . ROOT_PATH . $ip . $session_id : ROOT_PATH . $ip . $session_id));
}

function insert_session()
{
return $this->db->set($this->session_id, array('expiry'=>$this->_time, 'ip'=>$this->_ip, 'data'=>'a:0:{}'), false, $this->max_life_time);
}

function load_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();
}
}
}

function update_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)
{
return true;
}

$data = addslashes($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);
}

function close_session()
{
$this->update_session();
return true;
}

function delete_spec_admin_session($adminid)
{
if (!empty($GLOBALS['_SESSION']['admin_id']) && $adminid)
{
$all_items = $this->db->getExtendedStats('items');
$items = $all_items['127.0.0.1:11211']['items'];
foreach ($items as $key => $item) {
if (isset($item['adminid'])) {
if ($item['adminid'] == $adminid) return $this->db->delete($key);
}
}
}
else
{
return false;
}
}

function destroy_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);
}

function get_session_id()
{
return $this->session_id;
}

function get_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
}

}

?>