login_required for tornado

gistfile1.py

def login_required(meth):
    def deal(self):
        if not self.get_secure_cookie("user"):
            self.redirect("/user_login/")
            return
        return meth(self)
    return deal

class MainHandler(tornado.web.RequestHandler):

    @login_required
    def get(self):
        self.write("hello,world")