检查Session是否过期, 验证Session可用性

def validate_session(self, session_ts):
        '''
        检查Session是否过期, 验证Session可用性
        '''
        now = time()
        ts = session_ts / 1000;
        if ts > ( now + 60 * 10 ) or now > ( ts + 60 * 30 ):
            return False
        return True