- Zope - Zope lists

Sessions and Persistence
by Dennis Allison 13 Nov '05

13 Nov '05

Current configuration: Linux RH7.3 Zope 2.8.4 Python 2.4.2 (but the same is observed with Python 2.3.5) I continue to observe occasional failures of the Zope session variable mechanism. The problem manifests itself by a KeyError when accessing data in the session data container. We have recently moved to Zope 2.8.4 from Zope 2.7.6. The frequency of these errors aooears to have increased significantly; of late, we have occasionally seen error messages saying that an entire SESSION data container is missing. The session variable interface is very simple: a pair of Python Scripts, one that gets a session variable and another that sets it. Both use the copy-out/copy-in mechanism required for persistence. ## Script (Python) "getSessionVariable" ##bind container=container ##bind context=context ##bind namespace= ##bind script=script ##bind subpath=traverse_subpath ##parameters=varname ##title= ## request=container.REQUEST session=request['SESSION'] return session[varname] # Script (Python) "setSessionVariable" ##bind container=container ##bind context=context ##bind namespace= ##bind script=script ##bind subpath=traverse_subpath ##parameters=var, val ##title= ## request = container.REQUEST RESPONSE = request.RESPONSE session=request['SESSION'] session[var]=val request.set( 'SESSION', session ) Most of the information we store in session variables are simple numbers or strings. In a few instances, we store python lists, python tuples, or python dictionaries. I am beginning to suspect the source of my bug is a persistence problem perhaps triggered by a conflict error or garbage collection in the temporary store used to hold the session variables. I further suspect that lists and dictionaries stored in session variables need to be instances of PersistentDict and PersistentList and not ordinary python data structures. I'd appreciate confirmation on these two issues from someone who knows the persistence mechanism better than I. Neither PersistentDict nor PersistentList are exposed in the restricted namespace. Advice as to how to expose them would be helpful as well. If I have a complex data structure (a list of dictionaries) does all the substructure need to have persistence wrappers as well--that is, does it have to be turtles all the way down? Thanks in advance. -d

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zope 2.8.4 on windows 98
by Fernando Martins 13 Nov '05

13 Nov '05

Hi, I tried to install zope 2.8.4 on win98SE. After starting the instance, it dies with the following error: File "C:\Program Files\Zope-2.8.4\lib\python\Zope2\Startup\run.py", line 21, i n run starter.prepare() File "C:\PROGRAM FILES\ZOPE-2.8.4\lib\python\Zope2\Startup\__init__.py", line 99, in prepare self.registerSignals() File "C:\PROGRAM FILES\ZOPE-2.8.4\lib\python\Zope2\Startup\__init__.py", line 320, in registerSignals Signals.registerZopeSignals([self.cfg.eventlog, File "C:\PROGRAM FILES\ZOPE-2.8.4\lib\python\Signals\Signals.py", line 116, in registerZopeSignals SignalHandler.registerHandler(SIGTERM, shutdownFastHandler) File "C:\PROGRAM FILES\ZOPE-2.8.4\lib\python\Signals\WinSignalHandler.py", lin e 207, in registerHandler sa = createEventSecurityObject() File "C:\PROGRAM FILES\ZOPE-2.8.4\lib\python\Signals\WinSignalHandler.py", lin e 84, in createEventSecurityObject sidEveryone.Initialize(ntsecuritycon.SECURITY_WORLD_SID_AUTHORITY,1) pywintypes.error: (120, 'InitializeSid', 'This function is only valid in Win32 m ode.') I understand the problem, but is it the intention that zope is not supported on win98? Is there a workaround? Fernando

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plone contents error
by José Adalberto F. Gualeve 12 Nov '05

12 Nov '05

I have installed - Zope 2.7.0 - CMF: 1.4.2 - Plone CMFPlone-2.0-final I am trying to migrate to zope-2.8/plone-2.1.1, Whats happens that when I try to import the site that run in the oldest version is not making some things, for example, "plone content". After I finished to install zope and plone, I added a new "plone site" from ZMI. Thats Ok, but, inside of new "plone site" I try to add one "plone content". It adds, but when I try to visualize this "plone content", I receive the following error: ----------------------------------------------------------------- Site Error An error was encountered while publishing this resource. AttributeError Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 187, in publish_module_standard * Module Products.PlacelessTranslationService.PatchStringIO, line 51, in new_publish * Module ZPublisher.Publish, line 144, in publish * Module Zope2.App.startup, line 199, in zpublisher_exception_hook * Module ZPublisher.Publish, line 104, in publish * Module ZPublisher.BaseRequest, line 286, in traverse * Module Products.CMFPlone.PloneFolder, line 348, in __browser_default__ * Module Products.CMFPlone.PloneTool, line 1083, in browserDefault AttributeError: 'NoneType' object has no attribute 'getActionById' (Also, an error occurred while attempting to render the standard error message.) Troubleshooting Suggestions * The URL may be incorrect. * The parameters passed to this resource may be incorrect. * A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to error log. If the error persists please contact the site maintainer. Thank you for your patience. ---------------------------------------------------------------------- Thnx ============================================== Notificação: Esta mensagem é de uso exclusivo do indivíduo ou entidade para as quais está endereçado e pode conter informações que são privilegiadas, confidenciais e isentas de revelação. Se você não é o destinatário desta comunicação, observe que qualquer disseminação, distribuição ou cópia é estritamente proibida. Se você recebeu esta comunicação por engano, favor notificar imediatamente através do email gualeve(a)yahoo.com e destruir a mensagem original. Grato. ============================================== Prof. José Adalberto Façanha Gualeve http://www.ucb.br/prg/professores/gualeve UCB-Universidade Católica de Brasília CCT-Centro de Ciência e Tecnologia Bacharelado em Ciência da Computação e Sistemas de Informação. Sala B-108.10 - Fone: 61-3569313. CESMIC - Centro de Excelência em Servidores de Missão Crítica Sala M-115 - Fone: 61-3569686 Q. S. 07 - Lote 01 - EPCT - Águas Claras - DF 72.030-170 _______________________________________________________ Yahoo! Acesso Grátis: Internet rápida e grátis. Instale o discador agora! http://br.acesso.yahoo.com/

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Basket 0.1 ("New Zope Packaging Regime Product") Released
by Chris McDonough 11 Nov '05

11 Nov '05

Basket is a Zope 2 product which allows you to employ the Python Egg format to deploy other Zope 2 products. The Python Egg packaging format is described at http://peak.telecommunity.com/DevCenter/ setuptools . The development of Basket was funded by the "Goldegg" initiative described at http://www.goldeggstack.org . Basket forms the basis for a suggestion of how Zope 2 Products should be packaged "by default" starting in Zope 2.10, so it's likely interesting for existing Product developers. You can read about it and get it from: http://www.plope.com/software/Basket/Basket Have fun! - C

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Schedule correction
by Rob Page 11 Nov '05

11 Nov '05

Hello (again) everyone: Earlier I wrote: > This process is nearing completion. We will send the > updated set of docs to the advisory committee, > collect feedback, incorporated that feedback and then > circulate those drafts to the community. > > Rough schedule: > > Nov 14: Circulate updated docs to advisory committee > Nov 18: Feedback from committee collected > Dec 25: Circulate doc set to community That last date should be NOVEMBER 25 -- not Dec 25. My apologies for the confusion. Regards, Rob -- Rob Page V: 540 361 1710 Zope Corporation F: 703 995 0412

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Re: Adding permission to an action yields infinite recursion
by Dieter Maurer 11 Nov '05

11 Nov '05

Please stay on the list! Readded... Lars von Wedel wrote at 2005-11-10 10:49 +0100: > ... >I don't understand how or where this is taking place in my example. The >page template called consists of static HTML only. Does the following >action definition cause the problem? > > {'action': "string:$object_url/view_available_books", > 'category': "object", > 'id': 'view', > 'name': 'view_available_books', > 'permissions': (VIEW_LIBRARY_PERMISSION,), > 'condition' : 'python:1' > }, > >Why does the problem only occur, if permissions for the action are _not_ >granted? This action looks innocent. Look at the code causing the recursion to understand why it recurses ;-) -- Dieter

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Foundation status update
by Rob Page 11 Nov '05

11 Nov '05

Hello everyone: We wanted to send an update on the status of the Zope Foundation. We circulated a number of documents to an advisory committee. The comments were excellent and precise. The comments also identified a number of documents that needed to be either developed or updated before we circulate the final set of documents to the community for review. This process is nearing completion. We will send the updated set of docs to the advisory committee, collect feedback, incorporated that feedback and then circulate those drafts to the community. Rough schedule: Nov 14: Circulate updated docs to advisory committee Nov 18: Feedback from committee collected Dec 25: Circulate doc set to community Thanks for your patience and attention! Regards, Rob -- Rob Page V: 540 361 1710 Zope Corporation F: 703 995 0412

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msSql and python
by Kate Legere 11 Nov '05

11 Nov '05

I have a zsql method to which I want to pass and argument. Normally I do it from a dtml method and the use something like this to test for equality. WHERE description = <dtml-sqlvar description type=string>. However, I'm passing the variable from a python script and it won't accept the dtml tag.... what do I put in the equality test? Kate

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Zope 2.8 or 3.1?
by HaraldFinnås 11 Nov '05

11 Nov '05

I'm new to Zope, and I've been playing with 2.8.1, but I really haven't done any real work with it yet. Now I expect to get my new decicated Zope hardware tomorrow, so I have to decide if I should go for 2.8.4 or 3.1.0. Any tips if I should go for the latest and greatest or stick with 2.8? I've also seen comments that running Zope on RHEL/CentOS might not be wise. My test env. is using FC4, but I'm planning to install CenOS 4.2 on the production server. Unwise choice? Regards, Harald

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Re: [Zope] AttributeError: 'NoneType' object has no attribute 'lower'
by Gabriel Genellina 11 Nov '05

11 Nov '05

At Thursday 10/11/2005 12:08, Larry Lay wrote: >I found no empty titles. Any other ideas? > >On 11/10/05, Peter Bengtsson <<mailto:peter@fry-it.com>peter(a)fry-it.com> >wrote: >I suspect that one item in your 'subsections' variable is None. >Try:tal:repeat subsection python:sequence.sort ([x for x in subsections >if not None],(('title','nocase','asc'),)) Note the typo (which was valid Python code anyway so might go undetected), should be: python:sequence.sort([x for x in subsections if x is not None],(('title','nocase','asc'),)) Gabriel Genellina Softlab SRL

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