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From Olemis Lang <>
Subject Re: [Apache Bloodhound] #22: Infinite recursion error when initialising a plugin that extends itself
Date Thu, 05 Apr 2012 19:37:38 GMT
On Wed, Apr 4, 2012 at 12:59 PM, Gary <> wrote:
> On 04/04/2012 06:08 PM, Ethan Jucovy wrote:
>>> Ah, thanks for pointing that out. I was about to write a ticket to get
>>> someone to get the theme engine to change the implementation.
>>> I don't particularly mind that a plugin wants to do a lot in their
>>> __init__ as long as they are prepared to deal with the potential error. As
>>> I think I already say, the only fault I see in Trac on this issue is that
>>> it doesn't deal with it quite helpfully enough. Basically I think it should
>>> survive the event to the extent of allowing the admin to disable the
>>> offending plugin from the admin interface.
>> Yeah, I just wanted to bring this up with a reference ASAP to make sure
>> it's easy to revisit the core patch later.  I agree that Trac should deal
>> with this more helpfully.  Surviving the exception would be nice; even just
>> catching the exception and re-raising it wrapped in some kind of
>> PluginInitializationException(plugin_name, exc) would probably be better
>> than the current behavior.
>> FWIW this should probably apply to all plugin __init__ errors; the infinite
>> recursion error just happens to be harder to debug than most since
>> understanding it relies on some knowledge of Trac internals.  But I notice
>> for example that code like the following in an active plugin is not handled
>> gracefully either:
>> class BadPlugin(Component):
>>     implements(IRequestFilter)
>>     def __init__(self, *args, **kw):
>> raise Exception
>> Best,
>> Ethan
> OK, I think we are in agreement but you make some good points that I updated
> I'm almost tempted to adjust the patch to only apply to the ThemeEnginePlugin and investigate
raising an appropriate exception as suggested. What does everyone else think?


I don't like the decision of failing for this reason ... but ... I
also consider there's a chance to make things work a bit different in
ThemeEngine code .



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