[Twisted-Python] using a reactor in a loop

Jean-Paul Calderone exarkun at divmod.com
Thu Mar 1 12:32:51 EST 2007

On Thu, 1 Mar 2007 09:21:50 -0800, Tom Brown <brown at esteem.com> wrote:
>I am trying to use a reactor in a loop. The application will go through the
>loop twice then hang when trying to stop the protocol. Here's my loop:
> [snip]
>I see the 'reactor stopped' get printed out twice through the loop but I don't
>see 'running server' get printed out a third time. So, reactor.run() is not
>returning. I must be missing something or going at this completely wrong. Any

The simple thing you're missing is that reactors can't be restarted. :)  One
way you can restructure your program to avoid needing to do this is to put
the body of your loop (minus reactor.run()) into a function which returns a
Deferred and to replace the call to reactor.stop() with code which fires that
Deferred.  You can set up callbacks on this Deferred to execute the whole
thing again if necessary.


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