On 30/09/10 13:44, Phil Mayers wrote:
This is because (as you've discovered) there are circumstances when a function is called in Twisted where the exception can't propagate "up" to the caller, because the caller is no longer higher in the call stack. Most prominent is reactor.callLater.
One quick thing you might be able to do is use t.i.task.deferLater instead of reactor.callLater, like so: def doStuff(): breakobj = Break() d = task.deferLater(reactor, 2, breakobj) return d task.deferLater will schedule the call, but runs the call in a context which means any exceptions raised flow down the deferred errback. This: @inlineCallbacks def loop(): try: yield doStuff() except Exception, e: log.err(e) ...will then work, and "see" the exception.