March 2005 - Zope-Dev

Event & Timer Service for Zope 2.8
by Andrew Veitch 26 Jul '05

26 Jul '05

I noticed there was a thread last month on an event service for Zope. Did that reach any conclusion? From what I can see the present products are: - http://www.zope.org/Members/lstaffor/Xron - Zope 2.6 only, not being developed - http://zope.org/Members/naumen/NauScheduler - shipped with one of the Zope CMS's works fine with 2.7 - http://dev.legco.biz/products/ZopeScheduler and http://dev.legco.biz/products/timerservice - works fine with 2.7 too - http://cvs.zope.org/Products/Event/ - event service without a time service, not sure of development status - http://mail.zope.org/pipermail/zope-cmf/2005-January/021747.html - Dieter's project to be based on Python's sched module - http://api.nuxeo.org/CPS3/public/ CPSCore.EventServiceTool.EventServiceTool-class.html - CPS's event service - http://cvs.sourceforge.net/viewcvs.py/*checkout*/mailmanager/ mailmanager/MailCheckThread.py?rev=1.15 - our custom scheduler for MailManager - Zope X3's event service It would be great to some consolidation of all of this into the core. I would also strongly favour a timer service along with the event service. I know that the argument has always been that operating systems provide time services but this is not very convenient for cross platform development and on some Windows platforms it's difficult. A -- Logical Progression Ltd, 20 Forth Street, Edinburgh EH1 3LH, UK Tel: +44 (0)131 550 3733 Web: http://www.logicalprogression.net/

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ZPT: defer expression fix
by Christian Heimes 08 Apr '05

08 Apr '05

PageTemplates have an undocumented features called defer:. It's a kind of lazy initialization of variables. I've fixed to issues in my tiran-zpt-pydefer branch (svn): * DeferWrappers weren't working inside a python expression because PythonExpr didn't know about them * DeferWrapper didn't cache the result of the expression like ordinary vars do. I would like to merge my branch into 2.7 and 2.8 if I get an ok. Christian

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brain.getObject and traversal
by Florent Guillaume 07 Apr '05

07 Apr '05

To try to clarify things even more: The implementation of getObject I checked in a few days ago has the following properties: 1. it checks permissions only on the last step of the traversal, 2. it returns None if for some reason the object cannot be retrieved. Now for the rationale: 1. is necessary in the presence of rights granted deeper in the hierarchy. There's no going around it. 2. is necessary for backward compatibility. *all* the previous implementations of getObject returned None in case of problems. The implementation of 1. looks slightly convoluted but is necessary because we want to leave the details of the traversal (involving __bobo_traverse__, getitem, and checking security with the proper 'accessed' and 'container') to (un)restrictedTraverse. Florent -- Florent Guillaume, Nuxeo (Paris, France) CTO, Director of R&D +33 1 40 33 71 59 http://nuxeo.com fg(a)nuxeo.com

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Parrot
by Alan Milligan 01 Apr '05

01 Apr '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Parrot 0.1.2 was released a couple of weeks ago. According to the release notes, there's now "better python support, separated into dynaclasses". Unfortunately, I haven't really managed to keep up with the Parrot project, but I think it quite possibly represents the strategic future of Zope. An obvious benefit is the genuine concurrency it offers over GIL on SMP hardware. Anyone running an enterprise Zope or Plone installation would desire to take advantage of this. I know a year or so ago, someone received a pie in the face at a conference because Parrot still wasn't as fast as the native Python interpreter, but maybe this too has changed with this release. I'm very interested to know if anyone is investigating Parrot. Alan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFCO4vpCfroLk4EZpkRAsVVAKCQBlffkkhd86BX/KxwJcYSXPx5pwCfdiU8 Ybnu4zF97xG8SSYxYUY64I8= =KzS4 -----END PGP SIGNATURE-----

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Re: Clarification re: Zope X3.1, 2.8
by Tim Peters 31 Mar '05

31 Mar '05

Before I vanished for PyCon about two weeks ago, I was under the impression that merging Zope/branches/five-integration into Zope/trunk was imminent -- a matter of days, if not hours. Perhaps I was mistaken in that. Regardless, what's the current status of this? Last I saw, Andreas announced a plan to release 2.8a2 this coming Friday evening (according to my clock <wink>), but AFAICT the five-integration branch is still distinct from the trunk. Is it the plan to release 2.8a2 without merging this in? If not, what's the plan/schedule for merging five-integration? ZODB 3.4 requires some Zope3 packages, so there are potential integration headaches in two directions: (1) possible problems for ZODB due to five-integration using versions of those packages older than the ones ZODB 3.4 has been using; and, (2) code in five-integration that runs afoul of changes in ZODB 3.4. I can't predict these without trying the actual code. A possible example of #2 is that I rewrote hundreds of instances of get_transaction() in Zope trunks yesterday, because get_transaction() is officially deprecated in ZODB 3.4 and I don't want to release a Zope that raises DeprecationWarning in its internals. Perhaps the five-integration code has more instances of this that need to be changed. A clarification, because some have been confused about this (and it is confusing!): a ZODB trunk checkout stitches in its own copies of the Zope3 packages it needs, same as it stitches in copies of zdaemon and ZConfig. The process of stitching a ZODB into a Zope does *not* stitch those packages into that Zope: Zope uses its own copies of zdaemon, ZConfig, and Zope3 code. From Zope 2.8's POV, "ZODB" means exactly these 9 directories (these, and no others, get stitched in from a ZODB tag): Under lib/python/: ZODB ZEO persistent transaction BTrees ThreadedAsync Persistence ZopeUndo Under utilities/: ZODBTools (this is a renamed copy of ZODB's src/scripts/). I always expected (and still do) to do the ZODB stitching on Zope trunk, but since stitching in a ZODB does not include anything other than those 9 directories, I can't do it before at least the Zope3 packages are stitched in from the five-integration branch. Note that it's also possible we'll hit integration snags due to mismatches in the versions of zdaemon and ZConfig in use (the ones Zope trunk uses versus the ones ZODB has been using).

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Fwd: [Zope-dev] zope /tmp file usage
by Patrick DECAT 31 Mar '05

31 Mar '05

I did not understand why people why replying the same answer as I did: that simple I did not reply to the mailing list ;) ---------- Forwarded message ---------- From: Patrick DECAT <pdecat(a)gmail.com> Date: Thu, 31 Mar 2005 11:50:56 +0200 Subject: Re: [Zope-dev] zope /tmp file usage To: Pavel Zaitsev <pavel(a)md5.ca> Hi Pavel, when files are uploaded with WebDAV, they are part of an HTTP PUT request. If the file is larger than LARGE_FILE_THRESHOLD, a temporary file is created by the zhttp_collector in HTTPServer.py class zhttp_collector: def __init__(self, handler, request, size): from ZServer import LARGE_FILE_THRESHOLD self.handler = handler self.request = request if size > LARGE_FILE_THRESHOLD: # write large upload data to a file from tempfile import TemporaryFile self.data = TemporaryFile('w+b') else: self.data = StringIO() request.channel.set_terminator(size) request.collector=self Regards, Patrick. On Thu, 31 Mar 2005 01:52:11 -0500, Pavel Zaitsev <pavel(a)md5.ca> wrote: > Hi, > I am wondering what code in Zope 2.7.5-final potentially may use /tmp > directory for temprorary files. > I am using zope over webdav and sometimes webdav tries to create a tmp > file, of some sort and some parts of > the system lock up. There are xml parsers,mime decoders all of which do > have binary code bits, so I asking for expert > advice, if someone knows of what circuimstances zope would use /tmp > directory to create a file... > your help will be greatly appreciated. > Pavel > > _______________________________________________ > Zope-Dev maillist - Zope-Dev(a)zope.org > http://mail.zope.org/mailman/listinfo/zope-dev > ** No cross posts or HTML encoding! ** > (Related lists - > http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope ) >

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zope /tmp file usage
by Pavel Zaitsev 31 Mar '05

31 Mar '05

Hi, I am wondering what code in Zope 2.7.5-final potentially may use /tmp directory for temprorary files. I am using zope over webdav and sometimes webdav tries to create a tmp file, of some sort and some parts of the system lock up. There are xml parsers,mime decoders all of which do have binary code bits, so I asking for expert advice, if someone knows of what circuimstances zope would use /tmp directory to create a file... your help will be greatly appreciated. Pavel

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Test failures with five-integration branch merged to head...
by Brian Lloyd 31 Mar '05

31 Mar '05

I did a merge from the five-integration branch to the head in a local sandbox, and got the following test failures - anyone know anything about them? Brian Lloyd brian(a)zope.com V.P. Engineering 540.361.1716 Zope Corporation http://www.zope.com

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Disabling FTP by default
by Florent Guillaume 31 Mar '05

31 Mar '05

I'd like to disable FTP by default, by commenting it out in skel/etc/zope.conf. The reason is that it's better to open as few ports as possible by default. Opinions ? Florent -- Florent Guillaume, Nuxeo (Paris, France) CTO, Director of R&D +33 1 40 33 71 59 http://nuxeo.com fg(a)nuxeo.com

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Adding Plone Content
by JV Singh 31 Mar '05

31 Mar '05

Hello. I need some help with this. I installed zope using 'apt-get install zope2.7' and then 'apt-get install plone'... But in the zope 'Add' list, I can't see any of the additionally installed components, including 'Plone Site'... I tried restarting zope, my browser and also the system.. Any tips? Regards, JV

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