July 2003 - Zope - Zope lists

zope backtalk product - some questioons
by David Hassalevris 14 Jul '03

14 Jul '03

Hi, So I liked the Zope Book and decided to take a look at the product "backtalk" - which implements structured text into a collaborative framework. I am stuck with a few things and wonder if anyone can help. 1) Essentially backtalk provides two new selectable objects into Zope: Backtalk Book and Backtalk Documents. The backtalk book is folderish. When backtalk documents are added they automatically appear as members of the table of contents. My idea is to link each table of contents item to a folder. The problem is when I create a new folder within the backtalk book object and add a back talk document into that subfolder ... the navigational arrows disapper. Its as if the backtalk book has "lost track" of documents in subfolders. How is this done? 2) I notice that the backtalk book object sorts it's table of contents by title (if no title then by id). But who wants a table of contents in apha order. There obviously is a work around to this. I just dont know it. Anyone? BTW, from what i've seen so far its a very nice product! I *think* the Zopebook was authorized using it. David

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Zope Freezing up with multiple threads accessing objects.
by Etienne Labuschagne 14 Jul '03

14 Jul '03

Hi all, I need to access Zope object in the ZODB from multiple threads every now and again (much like XRON does - except I have more threads that need to access it). Now I know I must get a valid connection into the ZODB every time a new thread wakes up and wants to get something done. I do this by getting a connection from the ZODB.DB instance in Globals and then getting the Application object from there. Unfortunately I am plagued by sporadic Zope freezing, where Zope accepts connections from a browser, but the page never returns (needless to say, all new threads that wake up and try and get the app also freezes). No crashes, exceptions, etc. After some very sophisticated print debugging ;) I have traced the problem to the ZODB.DB's "global" lock, ZODB.DB.l, not being released after DB.begin_invalidation has been called by ZODB.Connection.tpc_finish which has been called by ZODB.Transaction._finish_many which has been called by Transaction.commit. It seems as if ZODB.DB.finish_invalidation has never been called to release the lock after the initial begin_invalidation called by tpc_finish. It seems to me that this whole sequence is triggered by get_transaction().commit(), but I can't quite figure out what I am doing wrong. I get this problem on Zope 2.6.1 on both Win2k and Linux (four different machines), and yes, I did register my thread with ThreadedAsync to start my thread up. That thread, however starts up other threads - do I need to register those threads with ThreadedAsync too? FYI I get the App object as follows - is this the best way? If I get a temporary connection, do I also need to call close?: import Globals connection = Globals.DB.open(temporary=1) #I have also tried getting from the pool with no params, and with force=1 app = connection.root()['Application'] # some code using the app object here get_transaction().commit() app._p_jar.close() I have also tried using ZApplication.ZApplicationWrapper, etc, etc. Zope will run for hours before freezing or will freeze after about 10 seconds - totally random - what am I doing wrong? Thanks Etienne

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Passing context from DTML to Python
by Martin Richtarsky 13 Jul '03

13 Jul '03

Hi, I have an DTML document (doc) and a Python Script (script). Both of these are stored in the root folder. Now, I want to call doc on some arbitrary subfolder. doc outputs standard_html_header etc. and passes control to the script to do the processing. The problem is, 'context' in the script is the folder where the caller, i.e. the DTML document, is in. But I want to do work on the objects in the folder doc was called on. I would use something like: <dtml-var expr="pythonscript(context)"> but of course there is no context within DTML. Any hints? The documentation didn't help me. Thanks, Martin -- +++ GMX - Mail, Messaging & more http://www.gmx.net +++ Jetzt ein- oder umsteigen und USB-Speicheruhr als Prämie sichern!

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How do you delete an object that cannot be seen in the ZMI
by Michael Long 13 Jul '03

13 Jul '03

Hi, I have created an object in the ZODB that I cannot see in the ZMI and now don't know how to remove it. More importantly I would like to understand what I did so as not to do it again. I am sure more info is needed to track down the problem but I don't know what it would be. A brief explanation of what I am trying to accomplish. I am creating a folderish object with its id be autogenerated. Inside of this new object I want to create another folderish object with an id = 'Invoices'. Here is the traceback: Traceback (innermost last): Module ZPublisher.Publish, line 98, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module Products.PRealEstate.PRealEstate, line 253, in addPParcel Module OFS.ObjectManager, line 272, in _setObject Module Products.PRealEstate.PParcel, line 139, in manage_afterAdd Module OFS.Folder, line 46, in manage_addFolder Module OFS.ObjectManager, line 244, in _setObject Module OFS.ObjectManager, line 77, in checkValidId Bad Request: The id "Invoices" is invalid--it is already in use. Here is the code that caused it: def manage_afterAdd(self, item, container): """ Processing after creation """ item.manage_addProduct['OFSP'].manage_addFolder('Invoices', '') Thanks, Mike

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python versions- how to upgrade
by Kelley, Sean 13 Jul '03

13 Jul '03

I installed zope 2.6.1 for windows which uses python 2.1.3. A python library I want to install requires python 2.2 or better. Can I just run the windows installer for the latest python? Will it hook up to zope automatically or is there another specific place or way it needs to be installed for zope to use it? Will zope 2.6.1 work with python 2.2.3?

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Freeing ZSQL result sets?
by zoper＠disturbance.dhs.org 13 Jul '03

13 Jul '03

Greetings: How does one free ZSQL result sets? Here's the outline of my situation: 1. Do some logic in DTML and set some REQUEST vars which will be used in a query. 2. Run the query and do a dtml-in loop over it 3. In DTML, some more logic, which if a certain condition exists will re-set the REQUEST vars set in step 1 to new values 4. Run the query again and loop through it using dtml-in Step 4 breaks, presumably because it is still the same query instance as the first and the cursor is at the end of the set...? What is the appropriate way to handle this situation? Currently, I end up duplicating the query exactly into a new query with a unique name. I actually end up hitting that query 4 times in one page, so I have ZSQL methods eg query1, query2, query3, query4, all with identical SQL in them. I imagine I am missing something obvious... thanks for any anwers. Bryan

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Re: [Zope] Installing nVidia TNT2 M64
by Michael Long 13 Jul '03

13 Jul '03

It was brought to my attention that I sent this to the wrong list. My apologies to all for the wasted bandwidth. :( -mike On Sun, 2003-07-13 at 18:08, Marcus J. Ertl wrote: > Am Son, 2003-07-13 um 23.06 schrieb Michael Long: > > Hi! > > > I forgot to mention my system specs: > > SuSE 8.2 (clean install as of last week) > > ABIT KT7/KT7-RAID motherboard > > [...] > > I'm very afraid, you are on the wrong mailing list! This list is about > Zope, a web application server... > > Bye > Marcus > > > >

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RE: [Zope] securityinfo for a class
by Fernando Martins 13 Jul '03

13 Jul '03

Double thanks! For this solution and for writing the minimal howtos. That's where I started to prepare for the product I'm writing. Cheers, Fernando Max M wrote: > Fernando Martins wrote: > > > Hello, > > > > I'm creating a Product with a function retrieve(self, num) > which returns an > > email.Message object. > > > > In a zpt of the product I've > > > > <div tal:define="msg python:here.retrieve(request['num'])"> > > > > and I would like to manipulate msg using email.Message methods, like in > > > > <td tal:content="python:msg.get('from')">name</td> > > > > I've added these delarations to my __init__.py > > > > ModuleSecurityInfo('email').declarePublic('Message') > > ModuleSecurityInfo('Message').declarePublic('get') > > > > This doesn't work, it prompts the login box. > > > > How can I use Message's methods in a page template or Python Script? > > > Either use a wrapper, or set the: > > email.Message.__allow_access_to_unprotected_subobjects__=1 > > on the email instance. > > regards Max M >

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Installing nVidia TNT2 M64
by Michael Long 13 Jul '03

13 Jul '03

Hi, I have just installed the above card along side my existing AGP video card. I rebooting using the AGP card and ran Yast2 in order to configure it. Everything seemed to go well. I then rebooted the system, went into the bios and told it to boot using the PCI video card. The system detected the card. Just as SuSE started to boot the system hung right after displaying *GRUB Loading Stage2*. What could be the problem? Thanks, Mike

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OpenSector.org announcement & a question
by Nick Arnett 12 Jul '03

12 Jul '03

Relative to the announcement below, we're looking for an inexpensive (or free) place to host a backup copy of OpenSector.org's Zope-based site. The way we're currently operating is with the server at a home office with DSL, front-ended by Squid (acting as an HTTP accelerator) on a virtual server at Verio. That's working nicely -- Squid rarely has to hit the Zope server. However, if the DSL goes down, we're off the air. Thus, I'm thinking we should put a ZEO server on the same host and have clients hosted elsewhere, such as home offices, until it outgrows that scenario. That should give us a lot of headroom. Verio's virtual servers are contractually limited by the number of processes, and Squid is just one process! FYI, we built the site in Squishdot, then dropped it into Plone, mainly for its user registration, etc. We've been re-writing Squishdot to eliminate an awful lot of redundancy in the forms and code. From the start of coding to launching the site was only about three weeks, which says a lot for Zope, I think. We'd welcome your advice and experience. While we're no strangers to scalable web sites, we're relatively new to Zope. And if it isn't already obvious, the budget for this is tight, since it's not a revenue-producing activity. We're also looking for contributors -- news and discussion items, as well as people to review and edit. We're building some back-end tools to help our editors find and use items from a variety of RSS feeds and canned search engine queries. The announcement follows... -- Senti-Metrics Launches OpenSector.org Supported by Open Software Applications Foundation SANTA CLARA, CA July 10, 2003 Senti-Metrics, with support from the Open Source Applications Foundation (OSAF), today launched OpenSector.org (http://www.opensector.org) a news and discussion site about public sector open source software initiatives. "There is a tremendous amount of interest in open source in government and education around the world," said Mitch Kapor, founder and Chair of the OSAF, a non-profit organization working to create and gain wide adoption for software applications of uncompromising quality using open-source methods. "Until now, there have been few resources to help public sector decision-makers stay current on government initiatives related to Linux and other open source software. We are pleased to have been able to make a small contribution to the launch of OpenSector.org, which promises to be a powerful and useful site for anyone interested in what's going on with open source in the public sector." Kapor announced OpenSector.org at the O'Reilly Open Source Convention in Portland, Oregon. OSAF is funding Bart Decrem, author of Desktop Linux Technology Market Overview, published by OSAF, to help develop and manage OpenSector.org site content. Decrem was a co-founder of Eazel, Inc. and helped create the GNOME Foundation. OpenSector.org is a global news and meeting place where public sector decision and policy makers primarily in government and education can meet with each other and with open source software developers, projects, products, companies and ideas. It features news and features contributed by readers, organized by region, with weblog-style discussion of each item. "The main goal of OpenSector.org is to improve communication in the global software community," said Nick Arnett, Senti-Metrics' founder and senior partner. "Senti-Metrics helps large technology companies communicate more effectively with developers, so OpenSector.org is a perfect fit. We use open source software ourselves we rely heavily on Linux, MySQL, Python and other open source tools. OpenSector.org lets us give back to the open source software community." Senti-Metrics partner David Land and Arnett built and operate the OpenSector.org site with GNU/Linux, FreeBSD, Zope, Python, Squid and other open source products and tools. Land is the former publisher of the java.sun.com developer site at Sun Microsystems. About Senti-Metrics Senti-Metrics developed the Senti-Meter process, based on custom information retrieval and analysis tools that it uses to help its clients communicate more effectively with on-line constituencies. The company's techniques include sophisticated analysis of discussion traffic, social networks and linguistics, which it combines with expert human interpretation to organize, summarize and make sense of on-line buzz, creating custom reports and services for its clients. About the Open Source Applications Foundation The Open Source Applications Foundation, a 501(c)3 non-profit foundation, has a mission to create and gain wide adoption of Open Source application software of uncompromising quality. CONTACT: Senti-Metrics Nick Arnett +1 408-904-7198 narnett(a)senti-metrics.com

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