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object manager - getOb(...) - parameter '_marker'
by friedrich steindl 07 Dec '04

07 Dec '04

hi, can somebody give me a hint what the parameter '_marker' is meant for in this code of the zope object manager - def _getOb(self, id, default=_marker): # FIXME: what we really need to do here is ensure that only # sub-items are returned. That could have a measurable hit # on performance as things are currently implemented, so for # the moment we just make sure not to expose private attrs. if id[:1] != '_' and hasattr(aq_base(self), id): return getattr(self, id) if default is _marker: raise AttributeError, id return default _marker ist declared as an empty list at the beginning of the module, but outside of the object manager class ... and as i believe has something to do with the path to (container of) the object ??? thx for any hints steindl friedrich (-:fs)

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RE: [Zope] object manager - getOb(...) - parameter '_marker'
by Pascal Peregrina 07 Dec '04

07 Dec '04

If the object is not found, this raises an Exception unless you have explicitely given a default value (in that case that value is returned). So _marker is just used to know if a default value has been given by the caller (and that value can be None). Pascal -----Message d'origine----- De : zope-bounces(a)zope.org [mailto:zope-bounces@zope.org]De la part de friedrich steindl Envoyé : mardi 7 décembre 2004 12:47 À : zope(a)zope.org Objet : [Zope] object manager - getOb(...) - parameter '_marker' hi, can somebody give me a hint what the parameter '_marker' is meant for in this code of the zope object manager - def _getOb(self, id, default=_marker): # FIXME: what we really need to do here is ensure that only # sub-items are returned. That could have a measurable hit # on performance as things are currently implemented, so for # the moment we just make sure not to expose private attrs. if id[:1] != '_' and hasattr(aq_base(self), id): return getattr(self, id) if default is _marker: raise AttributeError, id return default _marker ist declared as an empty list at the beginning of the module, but outside of the object manager class ... and as i believe has something to do with the path to (container of) the object ??? thx for any hints steindl friedrich (-:fs) _______________________________________________ Zope maillist - Zope(a)zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************

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Newbie Q: How do I cal ZPT objects from a python script object?
by Joe Block 06 Dec '04

06 Dec '04

I'm running Zope 2.6.3 on Mac OS 10.3.6 (installed via fink). I'm trying to call a very simple page template from inside a python script object to display a message (in this case, the results of a database insert). Here's my results page template: <html> <head> <title tal:content="template/title">The title</title> <style type="text/css"> @import "/octavo/css/style.css"; </style> </head> <body> <p><span tal:replace="request/msg">msg</span></p> <div align="center"> <p>Logged in as <span tal:content="user/getUserName">User</span></p> </div> </body> </html> If I type the template's URL into a browser (<http://athena.local.:8080/octavo/trackart/results? msg=Foo%20bar%20baz>), it displays Foo bar baz as expected. I just can't call the template from within my python script, when I try I get the following error message Zope Error Zope has encountered an error while publishing this resource. Error Type: KeyError Error Value: msg I'm calling it from within the script object like so: msg = '%s added to client %s' % (job_id, clientname) return container.results(msg = msg) The script is in the same folder as the results template. I know there has to be something simple I'm missing, but I've banged my head against the wall for a while and haven't made any progress. jpb -- Joe Block <jpb(a)ApesSeekingKnowledge.net> Computer Science is about lofty design goals and algorithmic optimization. System Administration is about cleaning up the resulting mess.

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Re: [ANN] Epoz 0.8.6 released
by Anderson 06 Dec '04

06 Dec '04

Nate Aune wrote: > The __init__.py file contained in the tarball that I downloaded from > http://mjablonski.zope.de/Epoz/releases/Epoz-0.8.6.tar.gz > is plagued with the dreaded DOS carriage-returns. > > I.e. > import re^M > import urlparse^M > > And my hosting provider (zettai.net) doesn't have the cmd line tool dos2unix > installed! Do they have tr? I can't remember the exact syntax, its along the lines of: tr -d '\r' < inputFile > outputFile ALthough that would be slow to do unless you script it.... Do you have fromdos/todos installed? (similar to dos2unix etc.) Regards, Gareth

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Re: [Zope] UnpickleableError
by jens.walte＠kk.net 06 Dec '04

06 Dec '04

Hmm, req.formular wasn't really a string ^^ Now, it works. thanks although Original Message processed by David InfoCenter Subject: [Zope] UnpickleableError (06-Dez-2004 14:15) From: jens.walte(a)kk.net To: jw(a)obelix.bb.kk.net Hi all, i got an UnpickleableError with following source: def __init__(self, id, title, REQUEST): """ initialize... """ req = REQUEST self.id = id self.title = title self.users = (req.has_key('users') and req.users or '') self.emails = (req.has_key('emails') and req.emails or '') self.formular = (req.has_key('formular') and req.formular or '') The last line occures the error: ErrorType: UnpickleableError ErrorValue: Cannot pickle <type 'Python Method'> objects Traceback (innermost last): File /home/xfintra/xiteflex130/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /home/xfintra/xiteflex130/lib/python/ZPublisher/Publish.py, line 114, in publish File /home/xfintra/xiteflex130/lib/python/Zope/__init__.py, line 159, in zpublisher_exception_hook (Object: xiteflexWorkflowEngine) File /home/xfintra/xiteflex130/lib/python/ZPublisher/Publish.py, line 102, in publish File /home/xfintra/xiteflex130/lib/python/Zope/__init__.py, line 173, in commit File /home/xfintra/xiteflex130/lib/python/ZODB/Transaction.py, line 234, in commit File /home/xfintra/xiteflex130/lib/python/ZODB/Connection.py, line 346, in commit (Info: (('Products.xiteflexWorkflowEngine.xiteflexWorkflowAction', 'xiteflexWorkflowAction'), '\x00\x00\x00\x00\x00<\xf3\x91', '')) UnpickleableError: (see above) If i write.. self.formular = '' ..everything works fine. I also tried this: if req.has_key('formular') and req.formular: self.formular = req.formular else: self.formular = '' Same result: "UnpickleableError" The value of req.formular is ''! Has anybody an idea? Normaly this should work, or not? Thanks for your help. Regards woolfy

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Why do I get an attribute error when one tool calls another tool?
by Peter Millar 06 Dec '04

06 Dec '04

I can see that the MemberDataTool is able to call the portal_membership tool using the getToolByName method. (and there are hundreds more examples where this is successful) But when I try to do it I get an attribute error, (before you ask, yes the first tool has been successfully created first prior to me trying to add this second tool.): Traceback (innermost last): Module ZPublisher.Publish, line 101, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module Products.CMFCore.utils, line 427, in manage_addTool Module Products.ParasynPIP.ParasynChartTool, line 87, in __init__ Module Products.ParasynPIP.ParasynPIPChartTool, line 80, in getParasynPIPTool Module Products.CMFCore.utils, line 75, in getToolByName AttributeError: parasynpip_tool My code in the second tool looks like: def __init__(self): ppt = getToolByName(self,"parasynpip_tool") Any help anyone could provide would be fantastic, thanks in advance. My Install is zope 2.7.3, python 2.3, plone 2.0, no other installed products, on windoze, ____________________________________________ Peter Millar

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Changing domain hosts
by Ian Nunn 06 Dec '04

06 Dec '04

Greetings, I have to change my domain hosting service by month end. I want to install a Zope server and whatever applications I build with it. To that end, what services are necessary from my host? For example, do I need a host that offers Python? Best Regards Ian Nunn School of Computer Science Carleton University, Ottawa, ON, CA

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forward FileUpload objects through methods
by Andreas Pakulat 05 Dec '04

05 Dec '04

Hi, I've got a weird thing here. I have a function A in a product class that adds a file to the class instance via a HTTP-FileUpload. This function can be called via a form action directly, but I have some pages where the form action needs to be a different method B (of the same class) and also the names for the form fields have to be different. What I do then in the function B is create a dictionary prop and for all FileUpload objects from the form I create an entry in the dictionary with the apropriate name (that is used in function A) and afterwards I execute function A with prop as parameter. But if I return the props from function A I get a "string" for the FileUpload entrys not a FileUpload Instance! Is this known, is there a workaround? Andreas PS: To Illustrate this: class B: function A(self, REQUEST): f = REQUEST['file1'] if not f.filename in folder.objectIds(): folder.manage_addProduct['OFSP'].manage_addFile(id='',title='',file=f) [.. more files to add] function B(self, REQUEST): prop = {} prop['file1'] = REQUEST['file1fol'] self.A(prop) -- A vivid and creative mind characterizes you.

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RE: [Zope] Zope 2.7.3 Memory Leaks
by Andy Yates 05 Dec '04

05 Dec '04

> -----Original Message----- > From: Chris McDonough [mailto:chrism@plope.com] > Sent: Thursday, December 02, 2004 5:17 PM > To: Andy Yates > Cc: zope(a)zope.org > Subject: Re: [Zope] Zope 2.7.3 Memory Leaks > > On Thu, 2004-12-02 at 17:24, Andy Yates wrote: > > Now it seems to leak memory (400+ Mb) to the point I have to restart > > Zope every 3 days. > > > > I've read that memory leaks are almost always caused by the programmer, > > so I set up some very simple tests that did not involve existing code. > > Great idea. Note that I'm not trying to find a problem with Zope. My plan was to start with something very simple and then add more and more of the things we do on our production site and see when it starts leaking. However, even the simplest tests seem to leak memory. > > Next I created an 8Mb page template. This caused the memory usage to > > climb much faster. After the test the memory never goes back down. > > Do these templates access the sessioning machinery? > No. It is just a page template file with 8Mb of random text. > > I installed LeakFinder and started running more tests. > > > > I used ab to get a python script that stored a 1k string in the session > > object. The transient object container timeout was set to 1 minute. > > This also caused Zope to consume memory. LeakFinder said the > > Products.Transience.TransientObject.TransientObject ref count grew with > > each request and never went down. Everything else seemed to level off. > > The debug output of Transience.py showed that the "buckets" seemed to be > > getting deleted as expected, but the memory usage never goes down. 1 > > minute after the test stopped the transient object container showed that > > there were no more items in the container. It seems like when Zope > > deletes expired sessions but contents of the sessions are not deleted. > > This is actually probably normal. > > TransientObject buckets hang around for some period of time before they > are "garbage collected" (deleted from their container). A particular > TransientObject isn't garbage collected immediately when it expires, but > gets gc'ed much later along with other TransientObjects that were > created around the same time as a side effect of otherwise exercising > the sessioning machinery. Thanks for the explaination of how the transient gc works. That is exactly what I found when I looked in the source code and I can see all of this happening when I turn on the debug output. Sessions are created and placed in buckets. The active sessions move to the current bucket and expired session and old empty buckets get removed. Then there is a 1 in 6 chance they will be gc'ed on each request. I see all this happening but when the buckets are gc'ed the memory usage according to top does not go down. I ran the test again that puts a 1k string in the session objects. I used ab to run the python script 3000 times with a concurrency of 10. Python's memory went from 22Mb to 54Mb. Transient objects went from 0 to about 900 and stayed steady during the test. After the test the trans obs dropped back down to 0 as they expired. I continued to make occasional Zope requests to plain pages to make sure gc was getting tickled. After 8+ hours of this the memory was never released. Python was still using 54Mb. If I continue to create session objects the 54Mb is not reused by python it just continues to grow. > > Note that Python will usually not release memory back to the OS once it > has been allocated for its own use, so a large concrete amount of memory > consumed by Python may not even be an indicator of a leak! See > http://mail.python.org/pipermail/python-dev/2004-October/049480.html for > more info. The only solid basis for determining leaks is refcounts, and > it's tricky to figure out whether growing refcounts are leaks or if > they're just side effects of the ZODB cache holding on to old objects. I tested that too and python 2.3.4 on RedHat 9 does not seem to behave this way. I wrote a script that creates 100Mb of random strings and places them in a list. Then it waits a few seconds and deletes the list. When I look at the process with top I see memory (RSS) go up by about 100Mb and then a few seconds later it goes back down to just above the level when the script started. Then I put this in a loop. I can watch the memory usage just cycle up and down. This is what I would expect. Thanks! Andy

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Connecting to a MaxDB Database via ODBC (porting old C++ application to Zope)
by Hermann Himmelbauer 05 Dec '04

05 Dec '04

Hi, I am developing a Zope web application which relies on an existing Database (MaxDB, formerly SAPDB) Client written in C++. This client accessed my database via ODBC (on UNIX). My web application should on one hand access the database directly via a Zope Database Adapter and on the other hand use functions from this C++ Client which also accesses the database. (Some functions of this C++ Client are compiled as a library which can then be called from Zope). What I now need is a way to access my Database over one Database connection. What I am thinking of is to use some Zope Database Adapter that uses ODBC, and give the database handle to my C++ functions. My problem is: How would I get the ODBC Database handle from the Zope Database Adapter object? Is this easy to do? Will I run into problems by doing this? Moreover I don't know if there's a ODBC Database adapter available which is compatible to Zope and to MaxDB. There is a MaxDB Zope DA available but this does not rely on ODBC. Then there is this commercial mxODBC available but I don't know if it supports MaxDB. Can you give my some hints? Best Regards, Hermann -- x1(a)aon.at GPG key ID: 299893C7 (on keyservers) FP: 0124 2584 8809 EF2A DBF9 4902 64B4 D16B 2998 93C7

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