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Class instances changing address?
by Jeff Gentry 22 Jan '06

22 Jan '06

Hello ... I'm running Zope 2.7.3 w/ python 2.4.1. I'm in the process of developing a FS based product as a primary class w/ many sub-classes. I've been experiencing a problem which I thought I had completely nixed but apparently only partly so and now am out of ideas as to what might be the source of the problem. As background, the primary class (A) maintains a handle to an instance of another class (B) which handles interaction w/ a psycopg db controller. Class A also will instantiate several instances of Class C and as part of the construction will pass it the handle to class B. So in summary, A has a B and has 1:n C's, and C has a reference to B. A & B have physical representations in the ZMI, while instances of C are 'virtual'. What is happening at times is that all of a sudden any call from C to B (ie C is accessing the DB) will result in Zope reporting that it could not find the psycopg controller, and indeed when this happens, any call through B via C will show that B can not find any DB controllers (using SQLConnectionIDs()). When I looked a bit closer, I had C's instance of B do a 'print instanceOfB' before calling out to B, which looked like this in the console: <B instance at 2a9d564da0> What I found was at the moment that things stopped working, the address of the instance was changed, which explains a lot. However, I can not figure out why this would happen - as far as I can tell the B instance is not being reassigned in any capacity in my code. Also, this seems to happen a bit nondeterministically (although I'm sure it isn't really) in that the same set of operations will not always have the same result here - it might cause the above switch/failure in one run through but not the next 3 times. I wish I could post some relevent code but the code base but given that I'm not at all sure what section of the code might be causing this and the code base is several thousand lines long, that'sn ot really possible :( What I was hoping was that people might have some ideas as to what I might be doing wrong here (and admittedly I tought myself Zope & Python mostly from other Zope products and trial & error so there might be some key issue that I'm totally missing). Thanks in advance Jeff

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What product to choose?
by Karlo Lozovina 22 Jan '06

22 Jan '06

First of all, greetings to everyone :)! I have been given a task to choose appropriate software for developing two projects, that is - web pages. I'm quite familiar with many software products available out there, but I don't have the time to thoroughly test each one and then decide which one to use. So, this is the place where you guys come in - I will briefly as possible describe specifications of both projects and I would like to hear from you what would be the best platform to implement both projects. First one is something like a mathematical encyclopedia and online collaboration tool - mix between MathWorld (http://mathworld.wolfram.com/) and a Wiki of some kind (http://www.wikipedia.org) The most important feature is this: users must be able to edit documents using syntax similar to LaTeX (no WYSIWYG-like editor), because after all web will contain a lot's of math formulas and expressions, and most of the users are already accustomed with (La)TeX. There is a similar implementation in LatexWiki (http://mcelrath.org/Notes/LatexWiki) addon for ZWiki, which is Zope 2 based, but I haven't tested that one out so I can't really say is that exactly what I need. Second most important feature is that of interconnections of articles - for example: when I define and write let's say Pitagora's theorem, I want to be able to "include" (much like C's #include <>, and Python's import something) into other documents. This way all the material can be defined in central repository and broken into small pieces (theorems, proofs, tasks...) and then reorganized as needed. Second web is much less complicated - it's intended to be a mix between news portal and searchable database of medical and similar products. Currently, I'm reviewing few options for implementing those two projects - plain Zope 2 or a Zope 2 based CMS (Plone, ZWiki, etc). If there is a Zope 2 based CMS that satisfies most of my requirements, I wouldn't mind using that. But, since Zope 2 will be someday replaced by Zope 3, I'm not that happy to use an already outdated product. That brings me to my next question - would it be smart to try to develop this using Zope 3? Is it mature and production ready enough? There is a third possibility, try to do it from scratch using Python (since that is the only language I'm good in that is suited for web development), but that seems like to big hassle. I'm mostly biased forwards Zope 3, since it's quite a new product with (I hope :>) bright future - i'm just not sure someone with zero Zope knowledge (although, I know Python quite well) can develop both projects in under a half a year. There, that's all I can think of now, any thoughts, ideas, URL's are very much appreciated. Thank you in advance. -- Karlo Lozovina - Mosor

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Zope and Sqlite3 adapter
by David Pratt 21 Jan '06

21 Jan '06

Hi can someone advise whether there is an adapter for sqlite3 for zope. I normally use Postgres but I am curious about this for lightweight use. I realize sqlite3 is not multi-threaded itself but might be fine for small volume sites (if it can be forced to use a single thread for interaction with the db). Does anyone have any experience they can share if they have tried this before. Many thanks. Regards David

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Re: [Zope] can't create user with zopectl - Resource temporarily unavailable
by michael nt milne 21 Jan '06

21 Jan '06

Thanks. I set up a new instance but yes that would be the issue. I hadn't stopped the zope server. By the way I had a couple of issues running the mkzopesintance.py file as non-root. Had to use a browser based webadmin tool to assign permissions. Would you know the unix syntax to assign read, write and execute permissions to a user on a whole directory which is required for running mkzopesintance.py under the non-root user? I tried chgrp and chmod but couldn't get it working command line. On 1/21/06, Andreas Jung <lists(a)andreas-jung.com> wrote: > > > > --On 21. Januar 2006 15:16:35 +0000 michael nt milne > <michael.milne(a)gmail.com> wrote: > > > > > > > > File "/opt/Zope-2.8/lib/python/ZODB/FileStorage/FileStorage.py", line > > 114, in __init__ > > self._lock_file = LockFile(file_name + '.lock') > > File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 63, in > __init__ > > lock_file(self._fp) > > File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 42, in > lock_file > > fcntl.flock(file.fileno(), _flags) > > IOError: [Errno 11] Resource temporarily unavailable > > Try it again while your Zope instance is shutdown. > > -aj > > > > > >

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can't create user with zopectl - Resource temporarily unavailable
by michael nt milne 21 Jan '06

21 Jan '06

Hi I've been trying to use adduser through zopectl on a dev instance of zope but get the following error. Is the lock file the problem? Thanks File "/opt/Zope-2.8/lib/python/ZODB/FileStorage/FileStorage.py", line 114, in __init__ self._lock_file = LockFile(file_name + '.lock') File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 63, in __init__ lock_file(self._fp) File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 42, in lock_file fcntl.flock(file.fileno(), _flags) IOError: [Errno 11] Resource temporarily unavailable

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LocalFS under Zope2.9
by Dennis Allison 20 Jan '06

20 Jan '06

This is the LocalFS-1.3-andreas version. Later releases do not appear to address this issue. 2006-01-20T09:22:51 ERROR Zope Couldn't install LocalFS Traceback (most recent call last): File "/usr/local/src/zope/Zope2.9/lib64/python/OFS/Application.py", line 763, in install_product global_dict, global_dict, silly) File "/opt/zope/zproducts/standard/LocalFS/__init__.py", line 44, in ? import os, LocalFS File "/opt/zope/zproducts/standard/LocalFS/LocalFS.py", line 51, in ? from OFS.content_types import find_binary ImportError: cannot import name find_binary ---- --

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Newbee interfaces and implementations
by Roman Klesel 20 Jan '06

20 Jan '06

Hello, I'm in the process of learning to develop fs-zope-products. The developers guide recommends to write interfaces and implement them in classes. Now my question: When I have an interface: DoThings with several methods: doThis() doThat() doThattoo() ... and I have an implementation: DoThingsClass How will I then access the methods e.g. in a Template? Through the interface: tal:define="context/DoThings/doThis" or through the implemantation: tal:define="context/DoThingsClass/doThis" I would think the first one should be the case. But then how does the interface know where the implementation of the method is defined since it doesn't import the implementation? I'm currently on Zope 2.84. Please shed some light on me! Greetings Roman

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Zope 2.9 and product installation
by Dennis Allison 20 Jan '06

20 Jan '06

IssueTracker 0.6.13 Zope 2.9.0 64-bit linux 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'index_html' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'Statistics' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'ListIssues' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'ShowIssue' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'ListIssues.csv' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'CompleteList' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'export.csv' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_ManagementForm' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_ManagementUpgrade' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_ManagementUsers' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_PropertiesStatusScores' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_editIssueTrackerPropertiesForm' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_ManagementNotifyables' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_configureMenuForm' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'manage_POP3ManagementForm' ------ 2006-01-20T09:22:49 WARNING Init Class Products.IssueTrackerProduct.IssueTracker.IssueTracker has a security declaration for nonexistent method 'ShowIssue' Other products generate similar warnings. Is this a problem with Zope 2.9 or an incompatibility introduced as Zope 2.X migrates towards Zope 3.X? What should be done to resolve this class of problems. --

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zeopack: No handlers could be found for logger "ZEO.zrpc"
by Cameron Beattie 20 Jan '06

20 Jan '06

When I run the following: python /usr/lib/zope/bin/zeopack.py -d 20 -h localhost -p 8100 I get an error: No handlers could be found for logger "ZEO.zrpc" I have searched around and found a similar message at http://mail.zope.org/pipermail/zope-dev/2005-December/026097.html (relating to zeoup.py) but I didn't understand what needs to be done to remedy the problem. In the case of zeopack, the database is not packed i.e. the script doesn't work. I am running Zope 2.8.2 with python 2.4.1. Any help would be appreciated. Regards Cameron

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Products have incorrect "home" attribute
by George Lee 20 Jan '06

20 Jan '06

After migrating to a new server, several of my Zope products have an incorrect "home" attribute that specifies where they live on the filesystem. However, when I try to change these attributes using an external method, the attributes do not change. Any help? Peace, George

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