April 2001 - Zope-Dev

RE: [Zope-dev] Custom dtml tag ... parameters not evaluated
by Randall F. Kern 12 Apr '01

12 Apr '01

Try adding something like this in your render method (haven't tried this, but from a poking around the code in the DocumentTemplate directory in the past this seems about right): import VSEval expr = VSEval.Eval(variable_you_want_to_evaluate) value = expr.eval(md) -Randy > -----Original Message----- > From: Romain Slootmaekers [mailto:romain@zzict.com] > > I'm trying to create a custom dtml tag, and after the How-to on this > (http://www.zope.org/Members/z113/1) that in itself posed no > problem: easy > as pie. The problem I'm having with the tag is that parameters are not > evaluated. for instance (my tag's name is 'aa')

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getattr'ing proxy object's methods
by kent＠tiamat.goathill.org 12 Apr '01

12 Apr '01

I have a product with a proxy class for building objects which manage data for other objects. The proxy clients locate their proxy via meta_type, similar to a sql connection_id and use acquisition to establish parameters for each call. I want to pass method calls made to the clients directly to the proxy, but in the context of the client. Right now, my clients have a method: def Proxy(self): """Return the proxy associated with this object""" return getattr(self, self.proxy_id) which is used in conjunction with dtml-with to establish the context: <dtml-with Proxy> <dtml-in "getTable(project=Project, [...])"> This works fine, however, I would like for the clients to automatically pass method calls that they don't have on to the proxy. __setattr__ is not called for the proxy clients because the final URL component specifies an acquired folder method, not the proxy client. I tried __bobo_traverse__, but again, the final URL component is passed as the argument instead of the method, so it's not clear exactly how __bobo_traverse__ could make sense out of what needs to be done, much less know what method was to have been called. Is there a proper way to call a proxy object's method in this context, directly in the product class, without using dtml-with? Thanks!

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ZCatalog quickies
by Chris Withers 12 Apr '01

12 Apr '01

Is it just me or is line 644 of Catalog.py totally unused: sort_order='' Also, how come catalog sets a batch size of 20 if you don't specify one? What if I don't want batched results?! I've never experienced problems with this, and I've hardly ever wanted batching, so what am I not understanding about specifying a batch_size but not actually wanting or gettign batched results? cheers, Chris

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Re: collector entry - Memory Leak with ZSQL Methods (andy)
by Chris McDonough 12 Apr '01

12 Apr '01

Andy, Brian pointed out today that you aren't just leaking SQL-related objects, you're leaking requests... because requests hold a reference to every traversed object (via PARENTS), if you're leaking reuqests, its a very bad thing. It would also explain why you see so many leaked SQL-related objects if the site is heavily SQL-driven. It may be that your code is keeping references to requests (maybe keeping a global with tracebacks around?), or there is some other circular reference problem. As we haven't had any other corroborative reports of either the DA leaking or the SQLMethods stuff leaking on their own, I'm sort of at a loss to provide a solution. Is there any way to make this bug reproducible on a clean Zope install? Can we boil it down to the simplest case? - C > A new bug entry was added with the following information: > > Title: Memory Leak with ZSQL Methods > > At: http://classic.zope.org:8080/Collector/Collector/2154/sview > > Submitter: andym > > Email: andym(a)activestate.com > > Description: When running a large number of SQL queries using ZSQLMethods I get a memory large leak. Following is the information from debug_info after 12 hours of running the server: > > Shared.DC.ZRDB.RDB.SQLAlias 62627 62642 +15 > Record.Record 10527 10531 +4 > Acquisition.ImplicitAcquirerWrapper 32441 32443 +2 > ExtensionClass 5522 5524 +2 > ZPublisher.HTTPRequest.HTTPRequest 3749 3750 +1 > ZServer.HTTPResponse.ZServerHTTPResponse 3742 3743 +1 > ZPublisher.BaseRequest.RequestContainer 3739 3740 +1 > Acquisition.Acquirer 2695 2696 +1 > Shared.DC.ZRDB.RDB.NoBrains 2630 2631 +1 > > I can reproduce this easily. As a wild guess something is not being correctly destroyed, no matter how many sweeps clears I do. > > A current workaround is to restart zope every 6 hours or so. This is obviously sub optimal.

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Re: [Zope-dev] ZODBCA questions...
by Mark Pratt 12 Apr '01

12 Apr '01

Hi Andy, I would venture a guess that your ZODBC problems have to do with the DA being Level 1. visit the somewhat dated URL: http://www.zope.org/Members/petrilli/DARoadmap for details on what Level 1 through 3 represent. For an upcoming project we will need to work with MS SQL server as well so I've been discussing with Paul a bit about what it would take to fund a L3 DA. You might want to send him an email. Regards, Mark -------------------------------------------------------------- mark pratt (managing director) mark(a)beehive.de beehive elektronische medien GmbH http://www.beehive.de phone: +49 30 847-82 0 fax: +49 30 847-82 299

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RE: [Zope-dev] Using Python script to create ZClass instances
by Bjorn Stabell 12 Apr '01

12 Apr '01

After hours of fiddling around, I've already given up Python methods, but I can't even instantiate MySubZclass via External Methods?!?!? MyProduct . MyZClass . MySubZClass 1. folder.manage_addProduct['MyProduct'].MyZClass.MySubZClass_add(id) -> AttributeError for MySubZClass_add 2. folder.manage_addProduct['MyProduct'].propertysheets.methods['MySubZClas s_add'](id) -> NameError on MySubZClass (at least it gets to the constructor method) I really think one of the major pains of Zope is just instantiating objects... It's HELL hard, and NOT intuitive. -----Original Message----- From: Bjorn Stabell Posted At: Thursday, April 12, 2001 12:02 Posted To: Zope Developer Conversation: [Zope-dev] How do I call an HTMLFile in context provided by apath? Subject: [Zope-dev] Using Python script to create ZClass instances Hi there, Im having problems using Python script to create a ZClass instance from a ZClass that's inside of another ZClass. I have this addMyObject Python script as constructor script for "Scriptable Type Information" type object (CMF): ## Script (Python) "addMyObject" ##bind container=container ##bind context=context ##bind namespace= ##bind script=script ##bind subpath=traverse_subpath ##parameters=folder, id ##title= ## folder.Control_Panel.Products.MyProducts.MyObjects.MyObject_add(id) # folder.manage_addProduct('MyProduct')... doesn't work either item = getattr(folder, id) return item MyObjects is a ZClass that contains MyObject. The error I get is: Zope error Error type AttributeError Error value MyObjects There should be some explanation somewhere how to access resources inside of Control_Panel, but I fail to find it. Creating objects is very confusing and difficult at times... Bye, -- Bjorn Stabell <bjorn(a)exoweb.net> _______________________________________________ Zope-Dev maillist - Zope-Dev(a)zope.org http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )

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ActiveState / DC Collaboration
by Eric Roby 12 Apr '01

12 Apr '01

This is to the folks at DC; Will there be an effort to make Zope 2.3.x play with ActivePython 2.0 or is this a longer range goal ... Zope 3.x ??? I know there are alot of other irons in the fire but I am just trying to make some design decisions. I am bringing up multiple Zope sites in about six weeks. A small part of the effort can easily be accomplished with WEBDav clients but a significant portion of the site has evolved over the past 6 years and it is Perl/CGI. I know I can go the Python 1.5.2/distutils/compile source route but would prefer to leverage ActiveStates efforts and simply use pyppm to install pyperl and ppm to install Hack-Names. Any insight would be much appreciated. Eric

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RE: [Zope-dev] memory leak
by Marco Nova 12 Apr '01

12 Apr '01

> In either case, it seems like you shouldn't be using ParsedXML's > ExpatBuilder, which is an interface to PyExpat which is made to create > ParsedXML's DOM objects. You should be using your own PyExpat > interface to parse this information from your XML input, without the > overhead of generating a DOM tree that you're just going to throw > away. The interface is documented in the XML-SIG topic area on > python.org, and our ExpatBuilder should be a good example on how to > interface with our PyExpat installation - just don't build the DOM if > you don't use it. > > Regardless of what you *should* be doing :), or if I'm misreading you, > if you aren't keeping references to the DOM objects being created, > then they should be reclaimed by the GC, and you do seem to have DOM > objects lying around. I'd like to see your code, is it short enough > to post? Or you can chuck it into the collector or ParsedXML tracker. > > For debugging purporses, I'd suggest simplifying by supplying an XML > string directly, rather than from an external server. I've replaced ParsedXML's ExpatBuilder with the pyXML package and I used the sax parser without modifing the code (except for the import), this is the refcounts results. Class April 12, 2001 11:55 am April 12, 2001 12:00 xml.dom.NodeList.NodeList 2103 3678 +1575 xml.dom.Text.Text 1263 2208 +945 xml.dom.NamedNodeMap.NamedNodeMap 507 885 +378 xml.dom.Element.Element 499 871 +372 xml.dom.Attr.Attr 339 591 +252 xml.dom.DocumentType.DocumentType 7 10 +3 xml.dom.Document.Document 7 10 +3 xml.dom.Document.Document increments by 1 each time an xml is procesed (I tried to add a del doc at the end but it's ineffective). So the problem is not ParsedXML but Zope itself or my bad methods. Regards, - mn

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Custom dtml tag ... parameters not evaluated
by Romain Slootmaekers 12 Apr '01

12 Apr '01

Yo, I'm trying to create a custom dtml tag, and after the How-to on this (http://www.zope.org/Members/z113/1) that in itself posed no problem: easy as pie. The problem I'm having with the tag is that parameters are not evaluated. for instance (my tag's name is 'aa') <dtml-let y="someValue"> <dmlt-aa role="y" ...> ....</dtml-aa> </dtml-let> gives me in the code: role=="y" while I want it to be "someValue", playing with the quotes doesn't help either. I think that, in the python code I need to do some extra call to some routine that do the evaluation/substitution... but I don't know which. Anyway, I uncluded a code thingy below, (basically the code from the How-to) Can anyone help me on this ? TIA, Sloot. ---------------------------- code thingy < 20 lines ----------------------- from DocumentTemplate.DT_Util import * from DocumentTemplate.DT_String import String TAGNAME = 'aa' class AATag: name = TAGNAME blockContinuations = () def __init__(self, blocks): tagname, args, section = blocks[0] args = parse_params(args, role="dont-know", property=None, id="no-id-given") self.args, self.section = args, section def render(self, md): # some code here... __call__ = render String.commands[TAGNAME] = AATag

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RE: [Zope-dev] memory leak
by Marco Nova 12 Apr '01

12 Apr '01

I hope I hurt nobody attaching a 3 Kbyte zip file. > -----Original Message----- > From: Karl Anderson [mailto:karl@digicool.com] > > Dyon Balding <dyon(a)devcoder.com.au> writes: > > > On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote: > > > Hello guys, > > > > > > It seems that I've some memory leak problems and I want > to understand where > > > I've to look for. > > > > > > Scenario: > > > > > > I've an IIS web server that generates an XML page (taking > data from > > > SqlServer); > > > The Zope web server must retrieve the XML page, manage > the data and render > > > them in HTML (I cant only apply a XSL stylesheet to XML). > > > > > > The Facts: > > > > > > I've written a external method that - using httplib - > reads the XML page and > > > return a string that is the raw XML sources, than I've > written another > > > external method that use ExpatBuilder of > Products.ParsedXML.DOM to parse the > > > XML an generate a list of [(id - {mapping})] which will > be accessed with a > > > dtml-in tag, so in the sequence-key I've access to the ID and with > > > sequence-item I can access to the mapping object. > > Are you parsing the XML and creating this list from the DOM objects, > and then throwing them away? Or are you parsing the XML and creating > this list from your pyexpat interface code, and never accessing the > DOM objects? I'm not sure, I think that the ExpatBuilder creates the DOM tree which I use for gather information for my list (look at tarkresults.py in the attacched zip file). > In either case, it seems like you shouldn't be using ParsedXML's > ExpatBuilder, which is an interface to PyExpat which is made to create > ParsedXML's DOM objects. You should be using your own PyExpat > interface to parse this information from your XML input, without the > overhead of generating a DOM tree that you're just going to throw > away. The interface is documented in the XML-SIG topic area on > python.org, and our ExpatBuilder should be a good example on how to > interface with our PyExpat installation - just don't build the DOM if > you don't use it. Ok, I will try, thanks.Anyway if my code is correct we have some bugs around Zope or ParsedXML that could be of help for someother. > Regardless of what you *should* be doing :), or if I'm misreading you, > if you aren't keeping references to the DOM objects being created, > then they should be reclaimed by the GC, and you do seem to have DOM > objects lying around. I'd like to see your code, is it short enough > to post? Or you can chuck it into the collector or ParsedXML tracker. > > For debugging purporses, I'd suggest simplifying by supplying an XML > string directly, rather than from an external server. Attached you will find a zip file containing: - res.xml, an xml file generated by my web server, you should import it as a dtml document named res; - tarkresults.py, an external method (id:process_results, modulename:tarkresults, functionname:process_results); - check_qs.dtml, a dtml method (id:check_qs); - grid_view.dtml, a dtml method (id:grid_view); - grid_page.dtml, a dtml method (id:grid_page); then accessing to grid_view, you should be able to reproduce the behaviour. Best Regards, - mn

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