Handling Stdin With Tornado

How to listen for events that happen on stdin in Tornado loop? In particular, in a tornado-system, I want to read from stdin, react on it, and terminate if stdin closes. At the sam

Solution 1:

You can use the add_handler method on the IOLoop instance to watch for events on stdin.

Here's a minimal working example:

from tornado.ioloop import IOLoop
from tornado.web import Application, RequestHandler
import sys

classMainHandler(RequestHandler):

    defget(self):

        self.finish("foo")

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

defon_stdin(fd, events):

    content = fd.readline()

    print"received: %s" % content

if __name__ == "__main__":

    application.listen(8888)

    IOLoop.instance().add_handler(sys.stdin, on_stdin, IOLoop.READ)

    IOLoop.instance().start()