如何使用 ctrl+c 停止 Tornado Web 服务器? [英] How to stop the tornado web server with ctrl+c?

问题描述

我是龙卷风网络服务器的新手.当我使用 python main_tornado.py 启动 Tornado Web 服务器时，它正在工作.请看下面的代码.

I am new to tornado web server. When I start the tornado web server using python main_tornado.py It is working. Please see the below code.

import tornado.ioloop
import tornado.web

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

application = tornado.web.Application([
    (r"/", MainHandler),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

当我使用 CTRL+C 停止服务器时，它给出了以下错误.

When I stop the server using CTRL+C it gave the following error.

    ^CTraceback (most recent call last):
  File "main_tornado.py", line 19, in <module>
    tornado.ioloop.IOLoop.instance().start()
  File "/home/nyros/Desktop/NewWeb/venv/lib/python3.2/site-packages/tornado/ioloop.py", line 301, in start
    event_pairs = self._impl.poll(poll_timeout)
KeyboardInterrupt

请解决我的问题.谢谢..

Please solve my problem. Thanks..

推荐答案

您可以使用 tornado.ioloop.IOLoop.instance().stop() 停止 Tornado 主循环.要在使用 Ctrl+C 传递信号后调用此方法，您可以定期检查全局标志以测试主循环是否应该结束并为 SIGINT 信号注册处理程序，这将改变这个标志:

You can stop Tornado main loop with tornado.ioloop.IOLoop.instance().stop(). To have this method called after passing signal with Ctrl+C you can periodically check global flag to test if main loop should end and register handler for SIGINT signal which will change value of this flag:

#!/usr/bin/python
# -*- coding: utf-8 -*-

import signal
import logging

import tornado.ioloop
import tornado.web
import tornado.options


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")


class MyApplication(tornado.web.Application):
    is_closing = False

    def signal_handler(self, signum, frame):
        logging.info('exiting...')
        self.is_closing = True

    def try_exit(self):
        if self.is_closing:
            # clean up here
            tornado.ioloop.IOLoop.instance().stop()
            logging.info('exit success')


application = MyApplication([
    (r"/", MainHandler),
])

if __name__ == "__main__":
    tornado.options.parse_command_line()
    signal.signal(signal.SIGINT, application.signal_handler)
    application.listen(8888)
    tornado.ioloop.PeriodicCallback(application.try_exit, 100).start()
    tornado.ioloop.IOLoop.instance().start()

输出:

$ python test.py 
[I 181209 22:13:43 web:2162] 200 GET / (127.0.0.1) 0.92ms
^C[I 181209 22:13:45 test:21] exiting...
[I 181209 22:13:45 test:28] exit success

<小时>

更新

我刚刚看到问题龙卷风长轮询请求这个简单的解决方案:

I've just saw in question Tornado long polling requests this simple solution:

try:
    tornado.ioloop.IOLoop.instance().start()
except KeyboardInterrupt:
    tornado.ioloop.IOLoop.instance().stop()

显然，这是一种不太安全的方式.

Obviously, this is a less safe way.

更新

编辑了代码以删除global的使用.

Edited the code to remove use of global.

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