[Twisted-web] exception in formless with a few nevow examples
grendel at caudium.net
Wed Jul 20 03:33:46 MDT 2005
On Tue, Jul 19, 2005 at 10:40:39PM -0400, Jp Calderone scribbled:
> >With the exception of userdb (which seems to give a slightly incorrect
> >traceback for the exception), the problem seems to originate at line 449 in
> >447 def formRenderer(ctx, data):
> >448 cf = ctx.locate(iformless.IConfigurableFactory)
> >449 return util.maybeDeferred(cf.locateConfigurable, ctx,
> >450 ).addCallback(_formRenderIt)
> >I'm not sure whether my guess is correct, but I perhaps the local 'cf'
> >variable has been garbage-collected before the _runCallbacks routine in
> >twisted/internet/defer.py calls the _formRenderIt?
> Objects never get garbage collected in Python until it is safe for them to
> be garbage collected. When there is code relying on their existence that
> might yet execute, it is not safe.
Yep, I kind of thought it could have been some obscure bug in the Python
garbage collector code.
> The real problem is that _formRenderIt is an entirely separate function,
> and it thinks "cf" is a local, but it's totally not. This is fixed in
> current svn trunk at HEAD, but was broken in the 0.4.1 release.
Indeed, everything works just fine now, thanks.
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