This is it! Thank you.
Quoting "Andrew Bennetts" <and...@bemusement.org>:
> vit...@synapticvision.com wrote:
> [...]
>> def abc1(self):
>> if t.test() is None:
>> raise Exception("Error11")
>> else:
>> d = defer.Deferred()
>> d.callback(1)
>> return d
>>
>>
>> and basically, I've expected in case of exception
>> self.handleFailure1() to be called, but I don't see it happen.
>
> This is a function that either returns a Deferred or raises an
> exception. This
> isn't a Twisted issue, it's simply a Python one: in
> “func1().func2()”, if func1
> raises an exception then func2 will not be invoked. That's
> fundamental to what
> raising an exception in Python means.
>
> If you want to convert this to something that always returns a
> Deferred, you can
> either rewrite it, e.g. using “return
> defer.fail(Exception('Error11'))”, or use
> maybeDeferred which will intercept exceptions for you, e.g.:
>
> return (
> maybeDeferred(self.abc1).
> addErrback(self.handleFailure1).
> # etc...
> )
>
> You can find maybeDeferred in the twisted.internet.defer module.
>
> -Andrew.
>
>
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