thanks so much for the quick response, and i wish i thought of looking in the FAQ ( just searched online, and nothing relevant came up )
Will defer.setDebugging(True) make these errors print/log sooner ? i'm in the process of getting all the addErrback() commands and making this app "proper", which is how i found this out in the first place. On Sep 26, 2012, at 8:20 PM, Itamar Turner-Trauring wrote: > On Wed, Sep 26, 2012 at 7:46 PM, Jonathan Vanasco <twisted-pyt...@2xlp.com> > wrote: > while migrating some functionality to a deferred callback chain and debugging > my app, i noticed this oddity... > > if a function doesn't have the proper args/kwargs definition, no error is > raised and everything just hangs > > ... > > then the reactor just seems to hang. > > if i kill the process, then the Unhandled Error and Traceback message prints. > If i wait until the next interval that the timerservice runs, then the > Unhandled Error and Traceback message will print then ( but that could be > minutes/hours later ). > > has anyone else noticed this before ? > > The reactor isn't hanging, it's running just fine. The problem is you expect > the Deferred's error to be logged immediately, which is not guaranteed; the > error is only logged if the object is garbage collected, which may take a > while, or never happen if you've kept extra references around. The latter can > happen by accident. > > are there any good ways around this , other than setting the timer service to > be within seconds during bugtesting ? > • Add a logging errback to all Deferreds at the end of the callback > chain: d.addErrback(log.err). > • Less effective, but also helpful, is making sure you delete all > unnecessary references to a Deferred once you've fired it, to make sure it > gets garbage collected: > self.d.callback(None) > del self.d # remove extra reference that prevents garbage collection > > http://bit.ly/NS6ptj explains the issue. > > -- > Itamar Turner-Trauring, Future Foundries LLC > http://futurefoundries.com/ — Twisted consulting, training and support. > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python@twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python // Jonathan Vanasco c. 646.729.6436 | 415.501.9815 e. jonat...@2xlp.com w. http://findmeon.com/user/jvanasco linkedin. http://linkedin.com/in/jonathanvanasco blog. http://destructuring.net _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
