[Zope3-Users] Help: I cannot login after installing z3c.formjs

Tue Jul 15 12:04:52 EDT 2008

Hmm, I've never gotten an error like that.  It probably wouldn't be
too difficult to patch jsclientevent.py by making sure caught events
have security proxies removed before they are stored.  But I wonder
why any request related data is being stored in the database.  My
understanding is that session data gets stored in the database but is
totally separate from the request.  A cookie (stored in the request)
is used to lookup the session data from the database.  My gut instinct
is that there is something wrong with the credentials plugin you are
using because request annotations should never be persisted across
multiple requests.  I am using SessionCredentials myself without any
problems.  Can you find the code path that tries to store the request
annotation?

>From a z3c.formjs perspective, if you want the caught events to not be
security proxied, you could create another object event listener (like
the one in z3c/formjs/jsclientevent.py) that goes through the caught
events and removes security proxies.  In the end this is a fragile
solution because you can't guarantee the order in which events are
handled, and unfortunately the way the zcml configuration is split up
(not at all), it would be difficult to override this default event
handler using an exclude directive.

I'm currently making some improvements to z3c.formjs and will make
sure to split up the zcml files more so doing such a customization is
easier.  There should be new releases of z3c.form and z3c.formjs in
the next couple of weeks with these changes.

- Paul

On Tue, Jul 15, 2008 at 7:51 AM, kevin gill <kevin at movieextras.ie> wrote:
> Hi,
>
> I am integrating z3c.formjs to a new site. After installing z3c.formjs I
> can no longer login. If I remove it, I can login again.
>
> It causes a problem with the SessionCredentials mechanism that I am using.
> The SessionCredentials annotations now contains event handlers of type
> z3c.formjs.jsclientevent.caughtEvents. These cannot be pickled.
>
> I tried both the PersisentSessionDataContainer and the RamSessionData
> Container.
>
> Does anyone have suggestions on how I might proceed with this?
>
> Thanks,
>
> Kevin
>
>
> This is the tail of the exception
>
> 2008-07-15T15:31:38 ERROR SiteError     rm.commit(self)
> ------
> 2008-07-15T15:31:38 ERROR SiteError   File
> "/opt/zope3-eggs/ZODB3-3.9.0_dev_r77011-py2.4-linux-i686.egg/ZODB/Connection.py",
> line 541, in commit
> ------
> 2008-07-15T15:31:38 ERROR SiteError     self._commit(transaction)
> ------
> 2008-07-15T15:31:38 ERROR SiteError   File
> "/opt/zope3-eggs/ZODB3-3.9.0_dev_r77011-py2.4-linux-i686.egg/ZODB/Connection.py",
> line 586, in _commit
> ------
> 2008-07-15T15:31:38 ERROR SiteError
> self._store_objects(ObjectWriter(obj), transaction)
> ------
> 2008-07-15T15:31:38 ERROR SiteError   File
> "/opt/zope3-eggs/ZODB3-3.9.0_dev_r77011-py2.4-linux-i686.egg/ZODB/Connection.py",
> line 613, in _store_objects
> ------
> 2008-07-15T15:31:38 ERROR SiteError     p = writer.serialize(obj)  # This
> calls __getstate__ of obj
> ------
> 2008-07-15T15:31:38 ERROR SiteError   File
> "/opt/zope3-eggs/ZODB3-3.9.0_dev_r77011-py2.4-linux-i686.egg/ZODB/serialize.py",
> line 408, in serialize
> ------
> 2008-07-15T15:31:38 ERROR SiteError     return self._dump(meta,
> obj.__getstate__())
> ------
> 2008-07-15T15:31:38 ERROR SiteError   File
> "/opt/zope3-eggs/ZODB3-3.9.0_dev_r77011-py2.4-linux-i686.egg/ZODB/serialize.py",
> line 420, in _dump
> ------
> 2008-07-15T15:31:38 ERROR SiteError     self._p.dump(state)
>
>
>
> I investigated the offending object, and it is the SessionCredentials.
> After adding the ajax handlers, the SessionCredentials object is no longer
> pickleable.
>
> (pdb) state=obj.__getstate__()
> (Pdb) cPickle.dumps(state)
> *** UnpickleableError: Cannot pickle <type 'zope.security._proxy._Proxy'>
> objects
> (Pdb) state
> (((('credentials', <zope.app.authentication.session.SessionCredentials
> object at 0xafea8fcc>),),),)
> (Pdb) credentials=state[0][0][0][1]
> (Pdb) credentials.request_annotations
> {'zope.app.publisher.browser.IUserPreferredLanguages': {'cached':
> ['en-gb', 'en']}, 'z3c.formjs.jsclientevent.caughtEvents':
> [<zope.app.publication.interfaces.BeforeTraverseEvent object at
> 0xafea8e4c>, <zope.app.publication.interfaces.BeforeTraverseEvent object
> at 0xafea8dac>, <zope.app.publication.interfaces.BeforeTraverseEvent
> object at 0xafea8dcc>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1b4c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1dac>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1d2c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1c6c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1ccc>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1c8c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1bcc>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb322c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb344c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb33cc>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb348c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb354c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb35ec>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb318c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb362c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1a4c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1b6c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb1f8c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb190c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb16ac>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb18cc>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb172c>, <zope.contentprovider.interfaces.BeforeUpdateEvent
> object at 0xafeb18ac>]}
> (Pdb)
> credentials.request_annotations['z3c.formjs.jsclientevent.caughtEvents'][0]
> <zope.app.publication.interfaces.BeforeTraverseEvent object at 0xafea8e4c>
> (Pdb)
> cPickle.dumps(credentials.request_annotations['z3c.formjs.jsclientevent.caughtEvents'][0])
> *** UnpickleableError: Cannot pickle <type 'zope.security._proxy._Proxy'>
> objects
>
> (Pdb) ev =
> credentials.request_annotations['z3c.formjs.jsclientevent.caughtEvents'][0]
> (Pdb) ev.object
> <zope.app.folder.folder.Folder object at 0xb6034b6c>
> (Pdb) cPickle.dumps(ev.object)
> *** UnpickleableError: Cannot pickle <type 'zope.security._proxy._Proxy'>
> objects
> (Pdb) cPickle.dumps(ev.request)
> *** TypeError: a class that defines __slots__ without defining
> __getstate__ cannot be pickled
>
>
>
>
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-- 
Paul Carduner
http://www.carduner.net