August 1999 - Zope-Dev

Callbacks
by Scott Robertson 02 Aug '99

02 Aug '99

I'm trying to write a product that will use a callback/hook schema. That way a user can specify wether a DTMLMethod or a SQLMEthod should handle a paticular error. So I have an object with a function defined like this. def callback(self): """Call back test""" func = getattr(self, 'ring') return apply(func, (self, globals())) 'ring' is a document method defined in the root folder. It finds this object but when it tries to render 'ring' it can't find standard_html_header and gives me this traceback. Traceback (innermost last): File /home/sroberts/Zope/lib/python/ZPublisher/Publish.py, line 255, in publish_module File /home/sroberts/Zope/lib/python/ZPublisher/Publish.py, line 161, in publish File /home/sroberts/Zope/lib/python/ZPublisher/mapply.py, line 154, in mapply (Object: callback) File /home/sroberts/Zope/lib/python/ZPublisher/Publish.py, line 98, in call_object (Object: callback) File /home/sroberts/Zope/lib/python/Products/Wampum/WampumGenerator.py, line 83, in callback (Object: wamp) File /home/sroberts/Zope/lib/python/OFS/DTMLMethod.py, line 158, in __call__ (Object: ring) File /home/sroberts/Zope/lib/python/OFS/DTMLMethod.py, line 154, in __call__ (Object: ring) File /home/sroberts/Zope/lib/python/DocumentTemplate/DT_String.py, line 514, in __call__ (Object: ring) KeyError: standard_html_header I thought that maybe this was an aquisition problem so I tried using the __of__() call like this: return apply(func.__of__(self), (self, globals())) This gave the same error. Any thoughts? --------------------------------------------------- - Scott Robertson Phone: 714.972.2299 - - CodeIt Computing Fax: 714.972.2399 - - http://codeit.com - ---------------------------------------------------

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PyGreSQL DA: help testing
by Ross J. Reedstrom 02 Aug '99

02 Aug '99

Well Zopeists - I stuck my neck out on the postgres-hackers list late last week, and said I'd take a look at whiping the postgres DA into shape to work with Zope2. This involved modifying the PyGreSQL pgmodule source (wrapping calls to the backend with Py_START_ALLOW_THREADS and PY_END_ALLOW_THREADS macros), as well as the DB class inside ZPyGreSQLDA. Well, I think I've at least got it limping along, at Level 2, using the THUNKED_TM 'Kludge of the Century'. I chose to pass the Zope transaction points on through to the Postgres backend, initiating and ending transactions via the _begin, and _finish calls. Hope this is how it's supposed to work. I get what looks to be the correct set of lines in my postgres logs. It all seems to work in my hands, but this is my first attempt at working with threads, and I've written very little Python, besides ;-) So, I need help with suggestions on how to test everything. For this, I mean formal regression-type tests, at the python module interface level, both inside and outside Zope, rather than end-user, plug it in and see if it works for me testing. Anyone? Ross -- Ross J. Reedstrom, Ph.D., <reedstrm(a)rice.edu> NSBRI Research Scientist/Programmer Computer and Information Technology Institute Rice University, 6100 S. Main St., Houston, TX 77005

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Secure Tranactions with Zserver
by zope 01 Aug '99

01 Aug '99

While ZOPE with Apache-SSL is certainly possible , I personally would prefer a more tightly coupled structure than the lightweight server to server protocols provide(such as the certificate if available of the client ) . Tight integration of the SSL-Crypto extention with the zserver would allow security/permission capatibilities to be set on objects based upon a closed verification chain via client certificates (2 two majors support genning them with a simple code fragment. If encryption and X609v3 are available then zope becomes a FAR more interesting possibility for ecommerce. And besides its on the TODO list for the Zserver... Pyhon SSL modules ARE available in source... the question is where and how...(and preferably offshore i.e. NON US developement). cheers A pyhon/Zope novice but a Apache/mod-ssl/php fanatic who wandered here from midgard

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Re: [Zope-dev] CatalogAwareness?
by Kevin Dangoor 01 Aug '99

01 Aug '99

-----Original Message----- From: Michel Pelletier <michel(a)digicool.com> To: Kevin Dangoor <kid(a)kendermedia.com> Cc: David Kankiewicz <kankie(a)thegrid.net>; Zope-Dev(a)zope.org <Zope-Dev(a)zope.org> Date: Sunday, August 01, 1999 2:18 AM Subject: Re: [Zope-dev] CatalogAwareness? >Kevin Dangoor wrote: >> >> I'm setting up my own Findable base class (as discussed in previous >> messages) to handle this. It appears that if you change a property that is >> specified as meta data in the ZCatalog, you'll need to refresh that entry in >> the Catalog, right? Does CatalogAware deal with that at all? Does it offer a >> method to update the object? (Does anything happen automatically if the item >> is renamed or if properties are changed?) > >The way to Zope portal toolkit components keep themsevles current with >the Catalog is to first uncatalog themsevles, and then recatalog >themselves. If the catalog that they acquire cares about some property >about that object, then those propeties will get cataloged. otherwise >the object ignored. For my 'Findable' class, I made an updateObject method that will uncatalog and then recatalog the object. I guess I was curious if the CatalogAware class has such a method as well. >If I remember correctly, there are also hooks that objects can set on >themselves that get called by the zope transaciton machinery. I would >need to ask jim if it's a good idea for an object to try to acquire a >catalog and uncatalogs and recatalogs itself right before the commit, >thus if the object changed the catalog recatalogs the object. That would be nifty. Then the cataloging machinery is quite transparent. Just make the ZClass inherit from CatalogAware and setup the Catalog with the properties you want and you're all set! It's not too onerous to have to call an update or refresh method when the object is edited, however. >(The previous sentence reminds me of something Ken once said, 'Engish is >verbing.' (or was it 'English verbs.'?)) I believe the Hacker's Dictionary says "any noun can be verbed". Kevin

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ZODB3 question.
by Andreas Kostyrka 01 Aug '99

01 Aug '99

Hi! I've been thinking how to add rather complex preconfigured setups for products, and doing it the ZOPEsque way would mean storing it in the ZODB. 1.) Where can I store such data persistently? 2.) Is creating an additional Root object like "Product-XYZ-config" a good idea? Andreas -- Andreas Kostyrka | andreas(a)mtg.co.at phone: +43/1/7070750 | phone: +43/676/4091256 MTG Handelsges.m.b.H. | fax: +43/1/7065299 Raiffeisenstr. 16/9 | 2320 Zwoelfaxing AUSTRIA

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Re: [Zope-dev] CatalogAwareness?
by Kevin Dangoor 01 Aug '99

01 Aug '99

-----Original Message----- From: Michel Pelletier <michel(a)digicool.com> To: David Kankiewicz <kankie(a)thegrid.net> Cc: Zope-Dev(a)zope.org <Zope-Dev(a)zope.org> Date: Friday, July 30, 1999 10:45 PM Subject: Re: [Zope-dev] CatalogAwareness? >If a ZClass subclasses CatalogAware, and there is a 'Catalog' object in >it's acquisition path, they the object will automaticly catalog and >uncatalog itself when it is instanciated/deleted. I'm setting up my own Findable base class (as discussed in previous messages) to handle this. It appears that if you change a property that is specified as meta data in the ZCatalog, you'll need to refresh that entry in the Catalog, right? Does CatalogAware deal with that at all? Does it offer a method to update the object? (Does anything happen automatically if the item is renamed or if properties are changed?) Kevin

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