[Repoze-dev] weird intermittent error with apache2 and mod_wsgi

[Chris Withers]

Hi All,

Apologies for the cross post, but this problem is occurring with a
repoze.bfg app running on apache using mod_wsgi, and the exception is
suggesting something zope.interface related...

So, firstly, it only happens intermittently, and I haven't been able to
figure out any pattern to the exceptions. It didn't used to happen at
all (this app has been happily running for a year or so now) but I can't
think of anything that's changed on the machine in question that might
cause this. Restarting Apache does appear to cure it for a bit...

The exception is as follows:

File "aircon/bin/mod_wsgi", line 34, in <module>
from aircon.web import make_app
File "aircon/aircon/web.py", line 2, in <module>
from aircon.config import system,Session
File "aircon/aircon/config.py", line 1, in <module>
from gb50 import System
File "aircon/aircon/gb50.py", line 33, in <module>
class System:
File
"zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/advice.py",
line 141, in advise
return callback(newClass)
File
"zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py",
line 471, in _implements_advice
classImplements(cls, *interfaces)
File
"zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py",
line 447, in classImplements
spec = implementedBy(cls)
File
"zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py",
line 287, in implementedByFallback
spec = cls.__dict__.get('__implemented__')
2011] [error] [client 93.89.128.162] RuntimeError: class.__dict__ not
accessible in restricted mode

the section of gb50.py looks like:

from aircon.interfaces import ISystem,IUnit
from zope.interface import implements

class System:

implements(ISystem)

...

The interface is:

from zope.interface import Interface,Attribute

class ISystem(Interface):
...

Anyone seen anything like this before or have any ideas?

cheers,

Chris

--
Simplistix - Content Management, Batch Processing & Python Consulting
- http://www.simplistix.co.uk
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[Tres Seaver]

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On 06/27/2011 11:36 AM, Chris Withers wrote:
> RuntimeError: class.__dict__ not
> accessible in restricted mode

"Let me google that for you":

- - http://mail.zope.org/pipermail/zodb-dev/2009-June/012607.html

- -
http://mediacore.com/blog/hosting-multiple-wsgi-applications-with-apache/

- - http://trac.edgewall.org/ticket/3371

Tres.
- --
===================================================================
Tres Seaver +1 540-429-0999 tse...@palladion.com
Palladion Software "Excellence by Design" http://palladion.com
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[Chris Withers]

On 27/06/2011 17:31, Tres Seaver wrote:
> "Let me google that for you":
>
> - - http://mail.zope.org/pipermail/zodb-dev/2009-June/012607.html
>
> - -
> http://mediacore.com/blog/hosting-multiple-wsgi-applications-with-apache/
>
> - - http://trac.edgewall.org/ticket/3371

Adding:

WSGIApplicationGroup %{GLOBAL}

...to my httpd.conf before the virtualhosts section made no difference.
Still works fine for a while, then starts randomly and inconsistently
spitting exceptions, this time:

mod_wsgi (pid=22471): Exception occurred processing WSGI script
'/...mod_wsgi'.
Traceback (most recent call last):
File "...bin/mod_wsgi", line 34, in <module>
from aircon.web import make_app
File "...aircon/web.py", line 7, in <module>
from repoze.bfg.configuration import Configurator
ImportError: No module named bfg.configuration

I must stress again, this is intermittent, it'll work for a while, then
fail for a few requests, then more so until Apache is restarted.

(bfg.configuration is most certainly there and on the python path...)

cheers,

Chris

--
Simplistix - Content Management, Batch Processing & Python Consulting
- http://www.simplistix.co.uk

[Stuart Zurcher]

I know it has been a long time past, but I'm running into  the same issue and have tried the same things.  I was wondering if you ever nailed down what was causing the issue.