August 2001 - Zope-Dev

RE: [Zope-dev] Extending a class' __bases__ at runtime
by Adrian Hungate 29 Aug '01

29 Aug '01

I have just checked that 4.1.2 tarball and it does contain directories, is this a compatibility thing? I used the python/zope tar.gz code to create the file under windows (Part of the same PatchKit). My linux box is currently very ill so I can only test under windows at the moment. Adrian... -- Adrian Hungate Try Zope - http://www.zope.org - You might like it. If you do, try my Zope products - http://www.zope.org/Members/haqa - You might like them too! -----Original Message----- From: Morten W. Petersen [mailto:morten@thingamy.net] Sent: 29 August 2001 18:12 To: Adrian Hungate Cc: R. David Murray; Chris Withers; zope-dev(a)zope.org Subject: RE: [Zope-dev] Extending a class' __bases__ at runtime On Tue, 28 Aug 2001, Adrian Hungate wrote: > I think I must have missed the begining of this one, what is it you are > failing to achive? I have a hotpatch product that does what I think you > are talking about, so I guess we are not talking about the same thing. The PatchKit product? Doesn't seem like that'll do it no... (that's kinda cool by the way). Running 'tar zxfv <filename>' on the latest .tar.gz extracts them all as single files (without a directory) on Linux.. Cheers, Morten

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get permission
by Johan Beauce 29 Aug '01

29 Aug '01

Hello, I use "manage_permission" for init permission of my directory. Afterthat, I need to show the permissions for this directory! Example : myFolder.manage_permission('View',listOfRoles,1) Now, I need to get permissons from myFolder ! What is the function which give me the permissions from myFolder ; a function like myFolder.getPermissions('View',ListOfRoles) ; that give me the list of Roles cheked from the permission View. Can you help me ? Regards, Johan.

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RE: [Zope-dev] Extending a class' __bases__ at runtime
by Adrian Hungate 29 Aug '01

29 Aug '01

I think I must have missed the begining of this one, what is it you are failing to achive? I have a hotpatch product that does what I think you are talking about, so I guess we are not talking about the same thing. Adrian... -----Original Message----- From: Morten W. Petersen [mailto:morten@thingamy.net] Sent: 28 August 2001 22:53 To: R. David Murray Cc: Chris Withers; zope-dev(a)zope.org Subject: Re: [Zope-dev] Extending a class' __bases__ at runtime On Tue, 28 Aug 2001, R. David Murray wrote: > There's another reason to want to know the answer to this: the ability > to hotpatch the base classes of an existing zope class instead of > having to modify the source code for that class. This came up > for the person who was trying to create a version of the CMF that > used ZPatterns...and I don't recall hearing a solution. > > Plus, it sure is a "surprise" that something that works in normal > python code doesn't work in Zope! I presume this is an ExtensionClass > issue, but I don't know enough to suss it out. I'd offer $50 of merchandise at <put your favourite online store here> to anyone who fixes this issue. Cheers, Morten _______________________________________________ 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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Oracle Connection and ZSQLMethods
by alan runyan 29 Aug '01

29 Aug '01

I have some strange behavior that I can replicate happening on all my boxes (dev and staging). Its a huge problem for me. I am running Zope2.4 w/ DCOracle2 on Windows NT4.0. on development I installed Oracle Connection in the root /db_connection /folder /folder/sql_stmts /folder/sql_stmsts/all of my zsqlmethods are here when I copy Data.fs over to staging, I delete the db_connection and recreate it with appropriate db_conn string. but **all** my ZSQLMethods do not register the newly created db_connection(?) as a available Data source and I get this when I edit them: There are no SQL database connections. You need to add a Zope SQL database connection before you can edit a Zope SQL Method. but as stated, I've already added my Connection at the root. I can even copy/paste it into the folder with the ZSQLMethods, as well as add it from scratch in the ZSQLMethods folder and still get the same error. should I **not** be moving this in a Data.fs? I am also using Oracle StoredProcs and they are having the same problem. the crazy thing is -- I can 'Test' them and call them and they work. I also cannot ADD any new ZSQLMethods (no connections available) on the staging box. thanks, ~runyaga

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Extending a class' __bases__ at runtime
by Morten W. Petersen 28 Aug '01

28 Aug '01

Hia, trying to modify a class at runtime in Zope is proving hard to do. The first interactive session is a 'Zope debugging session': Python 1.5.2 (#0, Apr 10 2001, 10:03:44) [GCC 2.95.3 20010219 (prerelease)] Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam Welcome to <secure_monitor_channel connected 127.0.0.1:46914 at 90a7df8> >>> import Zope >>> a=Zope.app() >>> s=a['Secret'] >>> class a1:pass >>> class a2:pass >>> class a3:pass >>> s.__class__.__bases__ = s.__class__.__bases__ + (a1,a2,a3) >>> s.__class__.__bases__ (<extension class App.PersistentExtra.Persistent at 4022be80>, <extension class Products.BTreeFolder.BTreeFolder.BTreeFolder at 84fecf8>, <extension class Acquisition.Acquirer at 4024ac80>, <extension class AccessControl.Role.RoleManager at 82819f0>, <class Products.WarpFramework.product_base_item.product_base_item at 845e058>, <extension class Products.WarpFramework.base_item.base_item at 848f1b0>, <class Products.Secret.imports.imports at 8532fa0>, <class Products.Secret.initializations.initializations at 858ee28>, <class Products.Secret.trash_test.trash_test at 857e2d0>) >>> where, as you can see, trying to change the base classes doesn't work, while in an ordinary, 'plain python' interactive session, it works: Python 1.5.2 (#0, Apr 10 2001, 10:03:44) [GCC 2.95.3 20010219 (prerelease)] on linux2 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> class a: ... pass ... >>> b=a() >>> class a1: pass ... >>> class a2: pass ... >>> class a3: pass ... >>> b.__class__.__bases__ () >>> b.__class__.__bases__ = b.__class__.__bases__ + (a1,a2,a3) >>> b.__class__.__bases__ (<class __main__.a1 at 8070db0>, <class __main__.a2 at 806ff80>, <class __main__.a3 at 80709f8>) >>> a.__bases__ (<class __main__.a1 at 8070db0>, <class __main__.a2 at 806ff80>, <class __main__.a3 at 80709f8>) >>> Any clues on what needs to be done to be able to modify a class' base classes at runtime? Thanks & cheers, Morten

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RE: [Zope-dev] xml-rpc/soap errors
by Adrian Hungate 28 Aug '01

28 Aug '01

On that point, can someone tell me why/when the standard_html_error is rendered, and why/when an internal, seemingly un-editable, template is rendered. I would prefer if the standard one was always rendered, except if there is a syntax error in the standard one I guess, but couldn't that send a very simplified 500 error/page to the browser? Adrian... -----Original Message----- From: Andy McKay [mailto:andym@ActiveState.com] Sent: 28 August 2001 17:17 To: Chris Withers Cc: zope-dev(a)zope.org Subject: Re: [Zope-dev] xml-rpc/soap errors After a bit of research ive found its suprisingly simple to do in dtml (ugh): <dtml-if "REQUEST.get('CONTENT_TYPE', '') == 'text/xml'"> xml-rpc / soap etc <dtml-else> html </dtml-if> Cheers. -- Andy McKay. ----- Original Message ----- From: "Andy" <andy(a)agmweb.ca> To: "Chris Withers" <chrisw(a)nipltd.com> Cc: <zope-dev(a)zope.org> Sent: Tuesday, August 28, 2001 7:36 AM Subject: Re: [Zope-dev] xml-rpc/soap errors > > make standard_error_message a python script which only renders a template > in a > > given set of circumstances? > > Hmm still the same solution, but probably the only one I have. > -- > Andy McKay > > > > _______________________________________________ > 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 ) > _______________________________________________ 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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getting rid of a permission and other debugging considerations
by Leonardo Rochael Almeida 28 Aug '01

28 Aug '01

Hi, In using the declarative security framework, I fell to the typo trap and created another permission. After countless hours debugging zope, and tracking down why my site suddenly became offlimits to anyone but Managers, I finally nailed it. I had declareObjectProtected to a permission that was almost, but not quite, entirely unlike 'Access contents information'. But, alas, inside ZMI, the old and incorrect permission is still there, even though there is nothing else being protected by it. I restarted zope a couple of times but the permission was still there. But while I was writing the above paragraphs the litle voices inside my head told me in a hushed tone: 'Try stopping the zeo server...' Yes! ZEO is so painless that I almost forgot I was using a single machine ZEO configuration with two ZEO clients in different ports so that I could use a single browser with two different logins. So I stopped both clients and the zeo server and restarted them and the rogue permission was gone. I'd like to take this opportunity to thank Ken Manheimer for the Handy Emacs Gadgets at http://www.zope.org/Wikis/klm/EmacsGoodies, specially for the PDBtracker, which made debugging zope bearable. I'm still looking for a satisfatory way of running zope under ddd or the Idle debugger though. Pdb still lacks a 'display'-like function (to evaluate certain expressions whenever the debugger prompts) and Zope debug hooks bypass pydb (ddd) and the Idle debugger straight into Pdb proper. And speaking of debugging, it is really hard to debug permission problems in Zope. A lot harder than I thought it would be, and I like to think that I am used to hard debugging sessions. I have experience debugging C programs with only gdb, before I learned the wonders of running gdb under emacs or ddd. I still have nightmares from those experiences :-) Anyway, after seeing the permission system working from the browser point of view and from the declarative security of Python Products point of view, and even seeing some examples of __ac_permissions__ structures, I never thought that permission checking in zope would be so convoluted. The dynamically calculated __roles__ attribute gave me a still lingering headache :-) Also, can anyone explain to me why access should be denied if aq_base(container) equals getattr(accessed, 'aq_base', container) when other checks fail? (check lib/python/AccessControl/ZopeSecurityPolicy:ZopeSecurityPolicy.validate() to understand what I mean). In any event, it should be easier to be able to determine what permissions an user should have and what permissions she actually has, when confronted with an 'Unauthorized' or a 'Permission Denied' error. It is particularly troubling not being able to divine where the code jumps to from the call to roles=getattr(value, '__roles__', _noroles) at line 125 in the aforementioned file (as of Zope 2.4.1). Ok, enough rambling for now :-) Regards, Leo

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Oracle Database Connection objects dont close
by alan runyan 28 Aug '01

28 Aug '01

this is a follow up. I just tried to close my Oracle database connection object and my ZSQLMethods still use it. so it appears that Open/Close in the DCOracle2 beta5.zip dont work. Zope2.4, DCOracle2 beta5.zip, WindowsNT should I post this to the DCOracle tracker or to the Collector? ~runyaga

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RE: [Zope-dev] xml-rpc/soap errors
by Toby Dickenson 28 Aug '01

28 Aug '01

> I'm sure I saw a checkin which allowed that... Possibly in 2.4; my comment was based on 2.3.x

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Object reference problems
by Vincenzo Di Somma 28 Aug '01

28 Aug '01

Hi all, I have the following reference problem: I have : object A instance of AClass class objects b and c instances of BClass class A.list_of_refered_object = (getattr(self.aq_parent, 'a'), getattr(self.aq_parent, 'b')) When I want to refer b or c from A it works well untill I restart Zope or refresh the product. After restart Zope can`t find the refered objects. All self._p_changed are ok. -- Vincenzo Di Somma - Responsabile Ricerca e Sviluppo - Icube S.r.l. Sede: Via Ridolfi 15 - 56124 Pisa (PI), Italia E-mail: e.disomma(a)icube.it WWW: www.icube.it Tel: (+39) 050 97 02 07 Fax: (+39) 050 31 36 588

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