如何在tornado python app上添加限速功能

import tornado.web
import tornado.ioloop
from tornado.options import define, options

define("rate_limit", default=100, help="Rate limit in requests per minute", type=int)

class RateLimitHandler(tornado.web.RequestHandler):
    def initialize(self):
        self.request_count = 0

    def prepare(self):
        self.request_count += 1
        if self.request_count > options.rate_limit:
            self.set_status(429)  # 返回状态码429表示请求过多
            self.finish("Too many requests")

def make_app():
    return tornado.web.Application([
        (r"/", RateLimitHandler),
    ])

if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()