[Twisted-Python] How to exit a twistd program with a status code ?

[Pantelis Theodosiou]

I think that you should not put the sys.exit(1) call, after the
reactor.stop() call.
>From my very limited understanding of how Twisted reactor works, it could be
done with something like:

    statusCode = 1 #or whatever
    reactor.stop()

in the method that stops the reactor

and the exit call should be added where (after) the reactor is started:

    reactor.run()
    # this will be executed after reactor stops
    sys.exit(statusCode)

Please, correct me if I write nonsense here.

Pandelis Theodosiou

On Fri, Sep 24, 2010 at 4:49 AM, David Cournapeau <cournape at gmail.com>wrote:

> Hi,
>
> I have a program run through twistd, and would like to exit with a non
> zero status code on some error. I have a callback which stops the
> reactor and then sys.exit(some_value), but twistd still seems to catch
> the SystemExit exception after calling for reactor.stop():
>
> Unhandled error in Deferred:
> Traceback (most recent call last):
>  File
> "/home/david/local/lib/python2.6/site-packages/twisted/internet/base.py",
> line 1031, in connectionFailed
>    self.factory.clientConnectionFailed(self, reason)
>  File
> "/home/david/local/lib/python2.6/site-packages/twisted/web/client.py",
> line 350, in clientConnectionFailed
>    self.deferred.errback(reason)
>  File
> "/home/david/local/lib/python2.6/site-packages/twisted/internet/defer.py",
> line 307, in errback
>    self._startRunCallbacks(fail)
>  File
> "/home/david/local/lib/python2.6/site-packages/twisted/internet/defer.py",
> line 354, in _startRunCallbacks
>    self._runCallbacks()
> --- <exception caught here> ---
>  File
> "/home/david/local/lib/python2.6/site-packages/twisted/internet/defer.py",
> line 371, in _runCallbacks
>    self.result = callback(self.result, *args, **kw)
>  File "scripts/tests/run_tests.py", line 69, in exit_on_error
>    sys.exit(1)
> exceptions.SystemExit: 1
>
> What's the correct way of doing this ?
>
> cheers,
>
> David
>
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