March 2002 - Zope-Dev

where is Zope 2.5.1?
by Andrew Sydelko 18 Mar '02

18 Mar '02

I'm curious as to what is holding up Zope 2.5.1? 2.5.1b1 has been out for quite a while now (in Zope time). --andy.

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Zope 2.6 planning - call for contributors!
by Brian Lloyd 18 Mar '02

18 Mar '02

Hi all - Paul sent a note to zope-coders some time back fishing for some feedback regarding planning for a Zope 2.6 (excepted): > I propose that planning for a 2.6 focus on the following thoughts: > > 1) This release is more about community-contributed work than > ZC-contributed work. > ... > > Ultimately the things that go in 2.6 will be governed by what people in > the community are willing to contribute. > > So far the extent of contributions has been minor. Do we need to widen > the pool? Or do we instead try to get new contributors on the > Zope3 track? There wasn't much response to this when it was originally posted. Now that 2.5.1 is nearly out the door, it's time to start planning for a Zope 2.6. I've started a 2.6 plan on the dev site at: http://dev.zope.org/Resources/zope_260_plan.html I wholeheartedly agree that 2.6 needs to be significantly a community effort. While I know that many people are engaged in the Zope 3 effort, we also need to get some people engaged on defining and producing 2.6 in the interim. There is not much on the plan right now, so the possibilities are relatively wide open :) Let's get a discussion started to define 2.6. Brian Lloyd brian(a)zope.com Software Engineer 540.361.1716 Zope Corporation http://www.zope.com

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Large File Support
by Florent Guillaume 18 Mar '02

18 Mar '02

Just a heads up, for people who're not sure: None of the Linux binary downloads of Zope I've tested (including 2.5.1b1) are built with Large File Support in python. Also unstable Debian's python is without Large File Support, same thing with Mandrake 8.1. If you want to check for yourself your python, several methods: bin/python -c "import os; os.lseek(0, 1L<<33, 0)" This should give you an OSError. If you get an OverflowError you don't have Large File Support. nm bin/python | grep lseek This should show you at least one "lseek64". If your python uses a libpython.so, check using: objdump -T /usr/lib/libpython2.1.so.0.0 | grep lseek You should seek a "lseek64" here. HTH, Florent -- Florent Guillaume, Nuxeo (Paris, France) +33 1 40 33 79 10 http://nuxeo.com mailto:fg@nuxeo.com

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Question on Properties
by Andre Schubert 18 Mar '02

18 Mar '02

Hi all, i have question on the long, int and float properties. I'am working with these properties and found out that there is no way to represent them as None or NULL values. I'am working with sql and these properties and it is a good idea if the these properties can be represented as NULL or None values because a column in a database of type int could also be NULL(None in python). Thanks

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Re: [Zope-dev] Impact of additional protocols handled by Zope?
by Jeff Kowalczyk 18 Mar '02

18 Mar '02

[Eron] Yeah, this is something I'd be very interested in knowing, too. In fact, this particular ability could make or break a community project I'm going to be developing with Zope in the near future. Do you mean like the pluggable access that ZServer provides? I imagine there would also have to be some kind of pass-through backend storage to the actual service layer (like IMAP, for instance). This is definitely something I've been thinking about. [Eron] Getting my gears turning, Eron My thinking is that the protocol(s) that people might develop would be action-interfaces to Zope objects and methods. The canon example is IMAP, I guess. Someone might finish up something like http://www.zope.org/Members/michel/MyWiki/IMAPServer , and access/create/control Zope objects persisted directly in ZODB, using variations on the classes people already have for the various Zope Email Clients. Add Binari's IMAP Plug-In to the ubiquitous Outlook, and you've got a poor-man's Exchange Server*. To get public folder workflow, you'd need to use CMF (or Openflow), but that should change by the time Zope3 takes shape, workflow will apparently be native to Zope. (Can't wait) Jabber (or IRC, etc.) would be a slightly different use case. Jabber.py's maturation might mean that you could have a small number of users conferences authenticated against Zope's users. The users would use normal Jabber clients, but this should make web-chat interfaces very doable, too. A Zope Jabber protocol server might implement active conversations in session memory, and persist to Zope objects in response to a Jabber command. Jabber's logging idioms produce XML documents in the jabber.org implementation, ours would be Zope objects or whatever was needed by the developer. The back-end would be all Zope's turf. As for LDAP, existing LDAP products connect to external LDAP servers. But wouldn't it be useful if Zope's user database, and other folderish resources could be exposed as LDAP, with Zope as the server? A Dynamic DNS protocol handler could pump authenticated user's IP info into the LDAP tree, and so on. I'm probably getting ahead of myself here, its not like python implementations of these sophisticated protocols grow on trees. But they do seem to get started in the python community from time to time, and if Zope offered an easy way to hook a budding protocol implementation in to a mature application server, there might be a lot of can-do attitude to getting them beyond alpha stage. The key would be if the developer could add/delete/configure protocol products as easily as content products. As I said, It wouldn't take much for Zope to be a great Exchange drop-in replacement in your typical small business. It wouldn't really matter that much if python implementations of these protocols didn't have the scalability of their C-based brethren, lots of small Zopes doing big-server work would be a nice thing to develop against. * Better than Exchange, IMHO, because you'd have to be nuts to deploy Exchange or Small Business Manager in a real small business with no on-site IS Manager to handle backups or Active Directory admin duties.

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Replaceable types?
by Ivo van der Wijk 17 Mar '02

17 Mar '02

Hi, I'm still fighting with making my QuotaFolder work with some (imho) buggy code in Zope (mainly caused by exceptiontype-less try: except: constructs) (of course, I could patch the problems in Zope, but I'd still like my product to work without patches) The ObjectManager seems to have support for 'replaceable objects', i.e. when looking at checkValidId: if not allow_dup: obj = getattr(self, id, None) if obj is not None: # An object by the given id exists either in this # ObjectManager or in the acquisition path. flags = getattr(obj, '__replaceable__', NOT_REPLACEABLE) if hasattr(aq_base(self), id): # The object is located in this ObjectManager. if not flags & REPLACEABLE: raise BadRequestException, ('The id "%s" is invalid--' 'it is already in use.' % id) First of all, is allow_dup ever set to true? Does zope support duplicate id's in an ObjectManager anywhere at all? Secondly, can someone give me an example of a Replaceable object? Thanks, Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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Re: typo in HTTPResponse.py
by Evan Simpson 17 Mar '02

17 Mar '02

Christian Theune wrote: > Hmm. Is it possible to implement some option to turn this off? I just checked in the ability to use HTTP_TRACEBACK_STYLE to control the appearance of tracebacks in non-debug mode errors: '' (default): Place it in an HTML comment 'none': Omit it 'plain': Include it as plain text just as in debug mode. 'js': Show a § that expands into the traceback when clicked. Cheers, Evan @ Zope

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Multiple Database Connections Same Zsql method
by senkr 16 Mar '02

16 Mar '02

Is it possible to iterate though multiple databases with the same zsql method? Have multple identical databases with different data. Want to maintain only one method. Can i do this in DTML or do I have to use pythonscripts? I guess what I want to do is to have the query in one folder, call it from another folder and pass the database connection info to it. Not sure how well this would work with multiple users though....... Any advice is appreciated.

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Small Alert
by Jean-Paul Smets 16 Mar '02

16 Mar '02

Hi, I just upgraded this morning a Debian Woody server with Zope 2.5. The upgrade has resulted in all my CMF (which use SiteRoot or VirtualHostMonster) to refuse any authentication. Without SiteRoot or VirtualHostMonster, everything is fine. I am searching the reason. JPS.

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Zope crashes: Tim Peters reports potential problem
by Dieter Maurer 15 Mar '02

15 Mar '02

Tim Peters reports on "comp.lang.python": > [Martin v. Loewis] > > The garbage collector runs while having the GIL, so it does not need > > to be thread-safe. > > There's still a vulnerability here: gc *assumes* the GIL is held when > _PyObject_GC_Malloc gets called, and doesn't verify that the GIL is in fact > held. A rogue extension module could violate this precondition without > triggering a predictable error (and then "random" segfaults would be > likely). Maybe, we should check for this, too. Dieter

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