[Twisted-Python] How to chain deferred calls

[Valeriy Pogrebitskiy]

I am confused... If an exception is being raised in adc1() - errback is
supposed to be called and passed your Exception instance (wrapped up as an
instance of twisted.python.failure.Failure). 

Kind regards,
 
Valeriy Pogrebitskiy
Email: vpogrebi at iname.com
 
 
-----Original Message-----
From: twisted-python-bounces at twistedmatrix.com
[mailto:twisted-python-bounces at twistedmatrix.com] On Behalf Of
vitaly at synapticvision.com
Sent: Thursday, October 22, 2009 2:02 PM
To: twisted-python at twistedmatrix.com
Subject: Re: [Twisted-Python] How to chain deferred calls


Thank you for response.

the issue is if adc1() will raise up an exception, than following it  
.addErrback() will never be called cause adc1() will exit or raise  
Exception.

Quoting "Valeriy Pogrebitskiy" <vpogrebi at verizon.net>:

> Add another .addErrback() directly after adc1() - to handle that
> specific exception...
>
>
> Kind regards,
>
> Valeriy Pogrebitskiy
> vpogrebi at verizon.net
>
>
>
>
> On Oct 21, 2009, at 4:12 PM, vitaly at synapticvision.com wrote:
>
>> hi,
>> how can I chain in defer methods that could raise exception while
>> showing the exception that coming from method? I mean, if I'll do:
>> return (
>>   adc1().abc2().abc3().addErrback("Common2AllException")
>> )
>> than "Common2AllException" will be raised if abc1() raise Exception,
>> but I'd like to see the adc1() own exception (and not
>> "Common2AllException") ?
>>
>>
>>
>> t = Test()
>> def abc1(self):
>>   if t.test() is None:
>>     raise Exception("Error11")
>>   else:
>>     return 1
>>
>> def abc2(self):
>>   if t.test() is None:
>>     raise Exception("Error12")
>>   else:
>>     return 1
>>
>> def abc3(self):
>>   if t.test() is None:
>>     raise Exception("Error13")
>>   else:
>>     return 1
>>
>>
>>
>>
>> Appreciate the help.
>>
>>
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>
>
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