Comments (3)
session的存取是异步的,所以有一点点延迟(大概小于1毫秒左右)。如果请求过快,可能会造成A请求改变了session,但是B请求读到的仍然是旧的session。为了解决这个问题,可以用Gateway::getSession 和 Gateway::setSession 接口来存取session。
但是onClose里无法调用Gateway::getSession 和 Gateway::setSession接口,因为此时链接已经关闭了。
我想这里的解决办法是在内存中添加一个全局数组,里面记录所有client_id的session快照,如果快照本存在,就用最新的快照。
class Events
{
// ['client_id1'=>session_array, 'client_id2'=>session_array, ...]
public static $sessions = array();
public static function onMessage($client_id)
{
// 如果内存中有对应client_id的session快照数据则使用内存中最新的数据
$_SESSION = isset(self::$sessions[$client_id]) ? self::$sessions[$client_id] : $_SESSION;
// 各种操作$_SESSION
$_SESSION['xxx'] = xx;
unset($_SESSION['rooms']['A']);
// 操作完session记得同步一份给self::$sessions作为快照,保证self::$sessions里的数据是最新的
self::$sessions[$client_id] = $_SESSION;
}
public function onClose($client_id)
{
// 如果内存中有对应client_id的session数据则使用内存中最新的数据
$_SESSION = isset(self::$sessions[$client_id]) ? self::$sessions[$client_id] : $_SESSION;
// 业务逻辑
// ....
// 链接断开了,最后记得删除快照,避免内存泄漏
unset(self::$sessions[$client_id]);
}
}
注意:这个快照要求gateway路由规则是将某个client_id的请求路由给固定worker进程(默认路由就是这样)。
如果你自定义了路由规则需要小心,某个client_id的session数据可能分散在各个worker进程的self::$sessions里,那么这个方法就不会奏效。
from gatewayworker.
了解了,感谢!
- 如果用第三方组件比如redis来存用户的session数据,就不存在延迟问题了吧?
- 如果用redis来存储session,性能是不是没有用直接用$_SESSION的好?
- client_id 是全局唯一的吧?
from gatewayworker.
1、对
2、性能上一般感觉不到差别
3、对
from gatewayworker.
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from gatewayworker.