How to stop the tornado web server with ctrl+c?

Question

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
         


        

Answer 1

You can simply stop the Tornado ioloop from a signal handler. It should be safe thanks to add_callback_from_signal() method, the event loop will exit nicely, finishing any eventually concurrently running task.

import tornado.ioloop
import tornado.web
import signal

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

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

def sig_exit(signum, frame):
    tornado.ioloop.IOLoop.instance().add_callback_from_signal(do_stop)

def do_stop(signum, frame):
    tornado.ioloop.IOLoop.instance().stop()

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