February 2001 - Zope-Dev

Using Zope for Groupware/Messaging applications
by Joachim Werner 18 Feb '01

18 Feb '01

Hi! We are currently developing a groupware system with Zope. As usual, the options for the storage back-end are using a SQL DB (postgres, ...) or ZODB. I know that this question has been asked a thousand times. But I'll repeat it for our specific situation: SQL or ZODB+ZCatalog, which one is better? We have thousands, maybe millions of objects (mainly mail messages, notes, appointments). There should be very flexible views on the data, e.g. a message or document can either be viewed on the owner's personal workspace or on the project portal the document was posted to. The problems with SQL: - much more complex setup - problems with using ZEO - BLOBs (large binary objects like image files) don't work well on most databases The problems with ZODB/ZCatalog: - ZCatalog is not tested for extremly large numbers of objects. We fear that the index tables will become much too big - Some advanced queries are very hard to implement using ZCatalog Any comments? Joachim.

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LONG int breaks mysqlUserfolder
by francine broekhove 18 Feb '01

18 Feb '01

Hi, i wonder if this is where i should post this message? Anyway, i've been upgrading my zope from 2.1.6 (python 1.5.2) to zope 2.3.0src (with Python 2.0). I changed my Mysqlda to the latest version (in which a long definition has replaced the previous int). I breaks any application that uses indexes (int) in a mysql database, like f.i. my tree tag (see previous posts) and f.i. the mysqlUserfolder product. Can anyone tell me how to get int working again without the 'L' using mysqlUserfolder. Note - i use Python 2.0 but still get the same problem. What am i doing wrong? Greetings Francine _____________________________________________________________ Get Your Private, Free Email at <A HREF="http://www.burningmail.com" target="_new">http://www.BurningMail.com</A>

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Re: [Zope-dev] The structure of lib/python/*
by Dieter Maurer 18 Feb '01

18 Feb '01

Erik Enge writes: > I've been reading a lot of Zope code the last couple of years, but > still I really don't see any overall structure of lib/python. Is this > documented somewhere? I find the names quite self explanatory. Yes, I am a person that believes in self explanatory names and minimal documentation. If the structure were documented, you probably would not find it and few people would read it when they accidentally came along it. Dieter

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Extending propertysheets
by Johan Carlsson 17 Feb '01

17 Feb '01

Hi, I have a strong desire to be able to extend propertysheets with more types possibly adding checking for them. For instance be able to specify URLs, email addresses, ISBN-number etc. Is this good idea at all? What would be the risks? Cheers, Johan Carlsson

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More Zope 2.3.1b1 stuff.
by Erik Enge 17 Feb '01

17 Feb '01

This might be picking on very little things, but hey, someone has to do that too. :-) When adding a Version, the «Help»-button is there. Not a «Help»-link which seems to be the standard these days. Same goes for Mail Host, External Method, Z SQL Method and ZCatalog. Accelerated HTTP Cache Manager is missing its «Help»-link. So is the RAM Cache Manager, Script (Python), Set Access Rule, Site Root, Virtual Host Monster, Vocabulary, Z Gadfly Database Connection and Zope Tutorial. Oh, nearly forgot these: lib/python/ZPublisher/BeforeTraverse.py is missing the ZPL. lib/python/ZODB/DemoStorage.py, line 103: """ a transaction is simply a 4-tuple: packed, user, description, extension_data, records """ That seems like a 5-tuple to me, or my Python terminology is fubar.

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Zope 2.3.1b1 glitch?
by Erik Enge 17 Feb '01

17 Feb '01

Hia. When entering the ZMI and clicking on «Control_Panel», «Database management» and then «Cache parameters» I get two new tabs: «Contents» and «Undo». It's probably just me, but I don't quite understand these two. Couldn't we display the «Undo» tab along with «Database», «Cache parameters» and «Flush Cache»? The «Undo» tab (both in «Cache parameters» and «Flush Cache» points to /Control_Panel/Database/manage_UndoForm. When I enter manage_UndoForm I've so far never gotten any Undoable transactions up, and it brings me back to having the «Database», «Cache Parameters» and «Flush Cache» tabs. Kinda weird? If I go to /Control_Panel/Database/manage_undoForm (lowercase «u»), then I get a number of Undoable transactions. What's the difference between /Control_Panel/Database/manage_undoForm and /Control_Panel/Database/manage_UndoForm ? (Apart from the obvious spelling ;) Another thing. When I hit «Undo» in manage_undoForm I'm taken to the manage_UndoForm which displayes: «There are no transactions that can be undone.» Although, I know there are, because manage_undoForm says so. :-) The transaction(s) I marked as wanting to Undo are undone. So that works.

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RE: [Zope-dev] Import Libraries into Python Script
by Itai Tavor 17 Feb '01

17 Feb '01

What's wrong with: import imaplib imaplib.__allow_access_to_unprotected_subobjects__ = 1 And, if the above is somehow bad or insecure, how would you use your method to allow access to specific methods in a module, as in: import re re.__allow_access_to_unprotected_subobjects__ = { 'sub': 1, } Itai Brian Lloyd wrote: >This needs to be documented (and made a little easier), but >heres a quick primer: > > > o Create a new directory in your 'Products' directory > (called ModuleAssertions or something like that - the > name is unimportant). > > o Create an '__init__.py' file in the new directory. > > o Add module assertions like the example below to __init__.py: > ># Site-wide module security assertions > >from AccessControl.SecurityInfo import ModuleSecurityInfo >import string > >def allow_module(module_name): > module = __import__(module_name) > sec_info=ModuleSecurityInfo(module) > sec_info.setDefaultAccess(1) > sec_info.apply(module.__dict__) > for part in string.split(module_name, '.')[1:]: > module=getattr(module, part) > sec_info=ModuleSecurityInfo(module) > sec_info.setDefaultAccess(1) > sec_info.apply(module.__dict__) > > ># Allow access to base64 module >allow_module('base64') > ># Allow access to imaplib >allow_module('imaplib') > > > o Restart Zope > > > > > >Brian Lloyd brian(a)digicool.com >Software Engineer 540.371.6909 >Digital Creations www.digicool.com > >> -----Original Message----- >> From: zope-dev-admin(a)zope.org [mailto:zope-dev-admin@zope.org]On Behalf >> Of Chris Withers >> Sent: Thursday, February 15, 2001 6:49 AM >> To: zope-dev(a)zope.org >> Subject: [Zope-dev] Import Libraries into Python Script >> >> >> Hi, >> >> What's the 'approved' way of validating standard python modules >> so they can be >> imported in Python Scripts? >> >> I want to import imaplib but can't find out how :-( >> >> cheers, >> > > Chris -- -- Itai Tavor -- "Je sautille, donc je suis." -- itai(a)optusnet.com.au -- - Kermit the Frog -- -- "What he needs now is understanding... and a confederate victory" -- -- Dr. Jacobi, Twin Peaks --

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AttributeError validate using the Visitor pattern
by R. David Murray 16 Feb '01

16 Feb '01

OK, having helped me figure out how to work around the bug in accessing ZPatterns objects from a catalog, I've got a new challenge for you all. Now that I've got my list of objects, I want to generate a web page displaying them. The page has the structure of a series of table rows. Inside each row data about a single object is displayed, using a common format but with certain differences depending on the type of object. To implement this, I am trying to use the Visitor pattern from the Gang of Four book. So, I have a Folder displayItemList. This folder contains (at the moment) three methods: displayTable, visitAuthor, and visitBook. displayTable generates the html for the outer table, down to the <tr></tr> tags. Between those tags, it calls <dtml-var "accept(me)">, where me is this() for the displayTable method, and accept is a pythonscript method defined on each of the object type's Specialist. Each accept method is of the form: return visitor.visitBook(None,_,item=context) with _ bound to namespace on the bindings tab and 'visitor' being listed in the arguments line. visitBook begins with the line: <dtml-with item> Trying to display my list, I get an AttributeError on 'validate', and ZDebug flags the 'with' line as the error location. validate appears nowhere in my code, so from all I can figure from a certain amount of inspection of the source, Zope is looking for this method on the DTMLMethod and not finding it. ZDebug says the namespace stack consists of a single entry, which looks like the DTMLMethod itself (visitBook, presumably). Seems to me the namespace stack should be deeper than that. I've been poking at this for a couple hours now without making any more progress, so I'm going to quit for the day and come back to it tomorrow. If anybody has any bright ideas, or sees something obvious I'm doing wrong, please clue me in. Thanks! By the way, I also tried making accept be visitor.visitBook(context,_), but that produced the same error and ZDebug could only point to the call to accept as the error location. --RDM

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Need Zope 2.3 Binary for Python 2.0 under Win32
by Tim Lakey 16 Feb '01

16 Feb '01

I need a Zope 2.3 Binary that is running under Python 2.0 (not 1.5.2) for Win32 environment. I have been trying to compile one myself, but there are lot's of road blocks. If any of you have one that you already built, could you email it to me? TIA, Tim Lakey CTO, CarbonWave tim(a)CarbonWave.com

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Executing zopescript using zope-time
by Espen Sorbye Frederiksen 16 Feb '01

16 Feb '01

I need to automaticly execute a zopescript once a day (e.g. "ZopeTime().strftime('%H')==00") determined by the system clock. Any ideas how this can be accomplished within zope? Can I use zope-time as a referrense to the system clock or do I need to go via python? Have never done it before myself so any tests, code bits etc required are of great help. Cheers, Espen

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