April 2001 - Zope-Dev

How do I call an HTMLFile in context provided by a path?
by Itai Tavor 11 Apr '01

11 Apr '01

Hi, I have a method that receives a path: '/MyApp/SomeSpecialist/some_id/edit_html' and has to call edit_html in the context of some_id. If edit_html is a DTML Method, I can do this: obj = REQUEST.traverse(path) return obj(obj.aq_parent, REQUEST) But when edit_html is an HTMLFile in a Python Product, obj.aq_parent doesn't work. And trying to get some_id using REQUEST.traverse('/MyApp/SomeSpecialist/some_id') returns the index_html method of some_id, instead of the object itself. Any ideas how I can fix this? TIA, Itai -- -- Itai Tavor -- "Je sautille, donc je suis." -- itai(a)optusnet.com.au -- - Kermit the Frog -- -- "What he needs now is understanding... and a confederate victory" -- -- Dr. Jacobi, Twin Peaks --

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RE: [Zope-dev] memory leak
by Marco Nova 11 Apr '01

11 Apr '01

> have you checked the debug page in the control panel and > noted any refcounts > increasing? Class April 10, 2001 9:17 am April 11, 2001 8:34 am Products.ParsedXML.DOM.Core.Text 3241 27318 +24077 Products.ParsedXML.DOM.Core.Element 1777 14493 +12716 Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425 Products.ParsedXML.Printer.PrintVisitor 3 107 +104 Products.ParsedXML.DOM.Core.Document 10 112 +102 Yes, I've a lot of refcounts leaks. > any chance that this is the same problem that andy is running > into (read his > posts above)? I dunno because of my very lack of knowledge of Zope. All of these refcounts leaks means that the Product is doing something wrong or that I'm using in the wrong manner ? - mn > > -d > > 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. > > I'm using latest version of ZOPE (2.3.1, the binary one > with Python 1.5.2) > > and ParsedXML. > > > > The Problem: > > > > It seems that every time the method retrieve the page or > parse the XML I > > loose a bunch of kilobytes. Because the methods are very > simple (100 lines > > of code in total) and because I didn't create any class for > handling this > > workflow I can't understand where I can loose bytes. > > > > The Questions: > > > > Is the list generated for the dtml-in tag freed > automatically by ZOPE ? > > Is there a Garbage Collector somewhere that must be activated ? > > Should I avoid the use of the ExpatBuilder for XML processing ? > > > > Thanks for listening my newbies questions. > > > > > > Best Regards, > > > > - mn > > > > _______________________________________________ > > 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 ) > > -- > Dyon Balding <dyon(a)devcoder.com.au> >

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memory leak
by Marco Nova 10 Apr '01

10 Apr '01

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. I'm using latest version of ZOPE (2.3.1, the binary one with Python 1.5.2) and ParsedXML. The Problem: It seems that every time the method retrieve the page or parse the XML I loose a bunch of kilobytes. Because the methods are very simple (100 lines of code in total) and because I didn't create any class for handling this workflow I can't understand where I can loose bytes. The Questions: Is the list generated for the dtml-in tag freed automatically by ZOPE ? Is there a Garbage Collector somewhere that must be activated ? Should I avoid the use of the ExpatBuilder for XML processing ? Thanks for listening my newbies questions. Best Regards, - mn

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RE: [Zope-dev] Objects, Roles and Permissions
by Randall F. Kern 10 Apr '01

10 Apr '01

I haven't worked with this code closely in a few months, but as I recall permissions that are acquired are stored as a list, and those that aren't are stored as a tuple. if type(self._View_Permission) == type(()): # done, this permission isn't acquired above this point Furthermore, I may be missing the point of this thread, but if you are trying to get the list of all roles assigned to a permission (from a python product), you could use this: from AccessControl.PermissionRole import rolesFromPermissionOn roles = rolesFromPermissionOn('View', ob) -Randy > -----Original Message----- > From: Danny William Adair [mailto:Danny@Adair.net] > Sent: Monday, April 09, 2001 7:49 PM > To: richard(a)bizarsoftware.com.au > Cc: zope-dev(a)zope.org > Subject: Re: [Zope-dev] Objects, Roles and Permissions > > > Thank you very much, Richard! Cool! > > Still... > > >>> ... > >>> Feel free to expand the method to other roles > >>> and the full suite of permissions. > >>> ... > > Other *roles*? Roles are what's coming back, isn't it? > > >>> def viewPermissions(self, acquired=0): > >>> ''' walk up the acquisition path to find a > _View_Permission > >>> attribute... possibly _only_ the acquired > permissions. > >>> ''' > >>> chain = self.aq_chain > >>> if acquired: > >>> chain = chain[1:] > >>> for self in chain: > >>> if hasattr(self.aq_base, '_View_Permission'): > >>> return self._View_Permission > >>> return ['Manager'] > > "possibly _only_ the acquired permissions" - oops! Your > snippet worked fine > _if_ the view permission was acquired by that object. As soon > as I turned > off acquisition for the view permission of the object, it > would still give > me the acquired roles (that in fact were'nt acquired). What > does the "if" > statement look like that would return the object's own roles > for the View > Permission if acquisition was turned off? Naive Danny who > doesn't know s... > tried to put > > if hasattr(self.aq_base, '_View_Permission'): > return self._View_Permission > > at the beginning of your code, but no effect. :-( > > But now I see how to access specific permissions and read > their content (do > I? I'll experiment with it), thank you very much! I will put a > string.replace on top and pass the Permission to examine by string > parameter, and call that whole stuff "getAllowedRoles". > > A "getGrantedPermissions" for examining a role should work > similarly, right? > > def ac_inherited_permissions(self, all=0): > > set all to 1 and then... iterate through the list (tuple or > list? list of > tuples?) and check every "_current_Permission" if it contains > the role? > > Thx once again, > Danny > > btw: Isn't return['Manager'] at the end of your code obsolete > (but safe)? Or > is there anything special going on at the root level > (isTopLevelPrincipiaApplicationObject)? > > > _______________________________________________ > 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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Image Archive Project (phase 2)
by Michael R. Bernstein 10 Apr '01

10 Apr '01

Ok, I now have the following setup: ArchiveImages (Specialist) defaultRack traversal (SkinScript) traversal_method (Python Script) Renderings (Specialist) defaultRack The SkinScript in ArchiveImages/defaultRack simply points __bobo_traverse__ to traversal_method. traversal_method, in turn, checks to see if it is being called with one of a short list of known methods of the ArchiveImage ZClass, otherwise it returns an object in the Renderings Specialist. Which object, you ask? The objects in Renderings are instances of RackImage (a class that subclasses Image and DataSkin). Currently, I have hardwired behaviour that instantiates a RackImage in Renderings when you create an ArchiveImage. Assuming that the ArchiveImage is created with an id of '001', then the RackImage is created with an id of '001_original'. So when the traversal_method is presented with a path of '/ArchiveImage/001/original' it returns the object from '/ArchiveImage/Renderings/001_original'. Thus the ArchiveImage ZClass appears to have an 'original' attribute that returns an image. Here is the traversal_method Python Script: import string if name in ['index_html', 'editInstanceForm', 'editInstance']: return getattr(context, name) else: rendering = string.join([context.id, name],'_') return container.Renderings.getItem(rendering) Ok, so what's next? Somehow, ArchiveImages must be made aware of what Renderings they have. The ArchiveImage Specialist needs a getRenderingIds() Python Script, which in turn calls container.Renderings.getRenderingIdsFor(). Now I'm stuck. How do I select all the Renderings that have (for example) '001' in their id, and return just the second portion of the id (such as 'original' or 'thumbnail')? What do I need to put into the getRenderingIds and getRenderingIdsFor Python Scripts? TIA, Michael Bernstein. P.S. The (currently hardwired) Renderings instantiation code will be delegated later to another Specialist, RenderingDisplays.

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SiteAccess: virtual host monster and setServerURL issue
by Joseph Wayne Norton 10 Apr '01

10 Apr '01

Evan and Zope Dev - I'm using the virtual host monster with apache proxy/rewrite mechanism. I faced a little bit of trouble dealing with zope's setServerURL method. I'm using a configuration such as this on the apache side: RewriteRule ^/(.*)$ \ http://localhost:1080/VirtualHostBase/http/%{HTTP_HOST}/vtfs/%{SERVER_NAME}… [P,L] * HTTP_HOST varies depending on how the client reaches the apache server. * SERVER_NAME (or really the name of the virtual host) is a constant defined in the apache virtual host. The correct virtual URL is not setup properly because the setServerURL method is always picking up the port #1080 (via oldhost,oldport) from the mod_proxy/mod_rewrite request environment even if HTTP_HOST does not contain a port number. I patched this issue by simply commenting out the lines below. I would like to keep using the HTTP_HOST variable mechanism, because the absolute_url() generated doesn't directly depend on the proper dns settings of the web client. For example, this allows apache to serve the content properly even if ssh is being used to forward http/https connections. Any recommendations?? - joe n. def setServerURL(self, protocol=None, hostname=None, port=None): """ Set the parts of generated URLs. """ other = self.other server_url = other.get('SERVER_URL', '') if protocol is None and hostname is None and port is None: return server_url oldprotocol, oldhost = splittype(server_url) oldhostname, oldport = splitport(oldhost[2:]) if protocol is None: protocol = oldprotocol if hostname is None: hostname = oldhostname #if port is None: port = oldport #if (port is None or default_port[protocol] == port): if (port is None): host = hostname else: host = hostname + ':' + port server_url = other['SERVER_URL'] = '%s://%s' % (protocol, host) self._resetURLS() return server_url -- ___________A_R_S_e_e_D__I_n_c_.__________ Joseph Norton C.T.O. (Chief Technology Officer) Tel:03-5431-5240 (Fax:5241) Visit us! http://www.arseed.co.jp/garden/

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RE: [Zope-dev] ZODBCA questions...
by Tim McLaughlin 10 Apr '01

10 Apr '01

actually, our SQL Server sites are using 2.2.X, so it could be something 2.3 related. were there any aqueduct or other RDB changes done between those versions? (I don't know of any, but I haven't looked) pertaining to MySQL, definitely use the native DA since ODBC will simply put an unnecessary layer in between Zope and the db. Tim -----Original Message----- From: Schmidt, Allen J. [mailto:aschmidt@nv.cc.va.us] Sent: Tuesday, April 10, 2001 8:29 AM To: 'Tim McLaughlin'; 'andym(a)activestate.com'; 'zope-dev(a)zope.org' Subject: RE: [Zope-dev] ZODBCA questions... We too are having problems connecting to Access2000 with ZODBCDA. Seemed to be working fine (and I guess it still does) but it is slowing our whole site down. all our parts were playing together very well until (we think) about the 2.3.x introduction. Our site grinds to a halt and is very slow in every aspect; usually in the morning but on and off throughout the day. We tried some caching in various places which seemed to help for a while but it is slowing back down again. Access2000 on Win2000 with ODBC connection to Zope with ZODBCDA. Could it be the single threadedness of either the DA or Win2K ODBC driver or Access2000 itself?? We think we have narrowed it down to the database causing the slowdown. Considered a move to MySQL as it is installed. Would the ZODBCDA to MySQL cause similar problems? Better to use the native My SQL DA? Anyone else running into same problems? Have any options to try? Thanks Allen -----Original Message----- From: Tim McLaughlin [mailto:tim@BCSWebservices.net] Sent: Tuesday, April 10, 2001 7:51 AM To: 'andym(a)activestate.com'; 'zope-dev(a)zope.org' Subject: Re: [Zope-dev] ZODBCA questions... Andy- We've had no probs with ZODBCDA connected to SQL Server (7 and 2000). What leads you to think it's a prob with the DA? Tim Message: 2 From: "Andy McKay" <andym(a)ActiveState.com> To: <zope-dev(a)zope.org> Date: Mon, 9 Apr 2001 10:45:55 -0700 Subject: [Zope-dev] ZODBCA questions... Im getting some performance issues with my sites, im connecting Zope to a SQL Server (not using ZEO). I've got suspicion, but no proof, that its ZODBCA that is the problem. Does anyone have experiences with this on large sites and / or a suggestion to replace it? Cheers. -- 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 )

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Re: [Zope-dev] ZODBCA questions...
by Tim McLaughlin 10 Apr '01

10 Apr '01

Andy- We've had no probs with ZODBCDA connected to SQL Server (7 and 2000). What leads you to think it's a prob with the DA? Tim Message: 2 From: "Andy McKay" <andym(a)ActiveState.com> To: <zope-dev(a)zope.org> Date: Mon, 9 Apr 2001 10:45:55 -0700 Subject: [Zope-dev] ZODBCA questions... Im getting some performance issues with my sites, im connecting Zope to a SQL Server (not using ZEO). I've got suspicion, but no proof, that its ZODBCA that is the problem. Does anyone have experiences with this on large sites and / or a suggestion to replace it? Cheers. -- Andy McKay.

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RE: [Zope-dev] ZODBCA questions...
by Schmidt, Allen J. 10 Apr '01

10 Apr '01

We too are having problems connecting to Access2000 with ZODBCDA. Seemed to be working fine (and I guess it still does) but it is slowing our whole site down. all our parts were playing together very well until (we think) about the 2.3.x introduction. Our site grinds to a halt and is very slow in every aspect; usually in the morning but on and off throughout the day. We tried some caching in various places which seemed to help for a while but it is slowing back down again. Access2000 on Win2000 with ODBC connection to Zope with ZODBCDA. Could it be the single threadedness of either the DA or Win2K ODBC driver or Access2000 itself?? We think we have narrowed it down to the database causing the slowdown. Considered a move to MySQL as it is installed. Would the ZODBCDA to MySQL cause similar problems? Better to use the native My SQL DA? Anyone else running into same problems? Have any options to try? Thanks Allen -----Original Message----- From: Tim McLaughlin [mailto:tim@BCSWebservices.net] Sent: Tuesday, April 10, 2001 7:51 AM To: 'andym(a)activestate.com'; 'zope-dev(a)zope.org' Subject: Re: [Zope-dev] ZODBCA questions... Andy- We've had no probs with ZODBCDA connected to SQL Server (7 and 2000). What leads you to think it's a prob with the DA? Tim Message: 2 From: "Andy McKay" <andym(a)ActiveState.com> To: <zope-dev(a)zope.org> Date: Mon, 9 Apr 2001 10:45:55 -0700 Subject: [Zope-dev] ZODBCA questions... Im getting some performance issues with my sites, im connecting Zope to a SQL Server (not using ZEO). I've got suspicion, but no proof, that its ZODBCA that is the problem. Does anyone have experiences with this on large sites and / or a suggestion to replace it? Cheers. -- 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 )

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Re: [Zope-dev] Proxy Roles Problem
by Dieter Maurer 10 Apr '01

10 Apr '01

Chris Withers writes: > .... > Anyway, it appears that proxy roles are [not] 'carried on'.... > > What gives? Is this how its intended? It is intended. Was changed with the big Zope 2.2 security policy shakeup. You may find some explanation for the change on zope.org. Dieter

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