December 2002 - Zope

Re: [Zope] Storing many large objects in many folders
by Toby Dickenson 10 Dec '02

10 Dec '02

> > > > I need to store many > > > > large objects (30+MB video files) in a way that > > > > how many is 'many'? > > Many means possibly hundreds, in the long run maybe a thousand. That gives you a total size of 3G to 30G. Thats big for a zodb, but not too big.

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'OFS/dtml' not needed
by Rares Vernica 10 Dec '02

10 Dec '02

Hi, I have a Zope 2.5.1 on a Linux. If I rename the 'dtml' dir in 'OFS', my Zope has no problem working (after restarting or running in debug mode, of course). My problem started when I changed a dtml file in 'OFS/dtml' directory an the changes could not been seen. So this directory is not needed, where are those files keeped, what's happening?! Any ideea?! Thanks in advance, Best regards, Rares

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Transperant folders breaks addCMFSite?
by Matthew 10 Dec '02

10 Dec '02

I just started using transparent folders. They are great and solved a lot of my headaches in one go. However, I notice that when I try to add a new CMF site I get the error below. I did this 1 hour after installing Transperant Folders. It hasn't happened with any other products I've tried. Can someone give me some insight into what happened, and what I should do? Many thanks. Matt. ---------------------------------- Error Transcript: An error was encountered while publishing this resource. *TALESError* Sorry, a site error occurred. Traceback (innermost last): File C:\PROGRA~1\WebSite\lib\python\ZPublisher\Publish.py, line 150, in publish_module File C:\PROGRA~1\WebSite\lib\python\ZPublisher\Publish.py, line 114, in publish File C:\PROGRA~1\WebSite\lib\python\Zope\__init__.py, line 159, in zpublisher_exception_hook (Object: testsite2) File C:\PROGRA~1\WebSite\lib\python\ZPublisher\Publish.py, line 98, in publish File C:\PROGRA~1\WebSite\lib\python\ZPublisher\mapply.py, line 88, in mapply (Object: finish_portal_construction) File C:\PROGRA~1\WebSite\lib\python\ZPublisher\Publish.py, line 39, in call_object (Object: finish_portal_construction) File C:\PROGRA~1\WebSite\lib\python\Shared\DC\Scripts\Bindings.py, line 252, in __call__ (Object: finish_portal_construction) File C:\PROGRA~1\WebSite\lib\python\Shared\DC\Scripts\Bindings.py, line 283, in _bindAndExec (Object: finish_portal_construction) File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\ZopePageTemplate.py, line 210, in _exec (Object: finish_portal_construction) File C:\Program Files\WebSite\lib\python\Products\CMFCore\FSPageTemplate.py, line 124, in pt_render (Object: finish_portal_construction) File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\PageTemplate.py, line 86, in pt_render (Object: finish_portal_construction) (Info: {'container': <CMFSite instance at 022CE068>, 'here': <CMFSite instance at 022CE068>, 'modules': <Products.PageTemplates.ZRPythonExpr._SecureModuleImporter instance at 0135B96C>, 'nothing': None, 'options': {'args': ()}, 'request': <h3>form</h3><table></table><h3>cookies</h3><table><tr valign="top" align="left"><th>sql_pref__cols</th><td>'40'</td></tr><tr valign="top" align="left"><th>sql_pref__rows</th><td>'20'</td></tr><tr valign="top" align="left"><th>tree-s</th><td>'eJzTiFZ3hIKAiHRb9VgdTQAwIwTY'</td></tr><tr valign="top" align="left"><th>__ac_name</th><td>'matthew'</td></tr><tr valign="top" align="left"><th>SITESERVER</th><td>'ID=c46e8ab759ce0780b7c83d6dd59ee9f5'</td></tr><tr valign="top" align="left"><th>show_filter_form</th><td>'1'</td></tr></table><h3>lazy items</h3><table><tr valign="top" align="left"><th>SESSION</th><td><Python Method object at 02078878></td></tr></table><h3>other</h3><table><tr valign="top" align="left"><th>__ac_name</th><td>'matthew'</td></tr><tr valign="top" align="left"><th>show_filter_form</th><td>'1'</td></tr><tr valign="top" align="left"><th>BASE3</th><td>'http://www.exhibit.com.au/testsite2/finish_portal_construction'</td></tr><tr valign="top" align="left"><th>SITESERVER</th><td>'ID=c46e8ab759ce0780b7c83d6dd59ee9f5'</td></tr><tr valign="top" align="left"><th>BASE1</th><td>'http://www.exhibit.com.au'</td></tr><tr valign="top" align="left"><th>traverse_subpath</th><td>[]</td></tr><tr valign="top" align="left"><th>SERVER_URL</th><td>'http://www.exhibit.com.au'</td></tr><tr valign="top" align="left"><th>VirtualRootPhysicalPath</th><td>('', 'clients')</td></tr><tr valign="top" align="left"><th>AUTHENTICATED_USER</th><td>matthew</td></tr><tr valign="top" align="left"><th>TraversalRequestNameStack</th><td>[]</td></tr><tr valign="top" align="left"><th>tree-s</th><td>'eJzTiFZ3hIKAiHRb9VgdTQAwIwTY'</td></tr><tr valign="top" align="left"><th>AUTHENTICATION_PATH</th><td>'clients/VirtualHostMonster'</td></tr><tr valign="top" align="left"><th>sql_pref__rows</th><td>'20'</td></tr><tr valign="top" align="left"><th>URL0</th><td>'http://www.exhibit.com.au/testsite2/finish_portal_construction'</td></tr><tr valign="top" align="left"><th>URL1</th><td>'http://www.exhibit.com.au/testsite2'</td></tr><tr valign="top" align="left"><th>URL2</th><td>'http://www.exhibit.com.au'</td></tr><tr valign="top" align="left"><th>sql_pref__cols</th><td>'40'</td></tr><tr valign="top" align="left"><th>PUBLISHED</th><td><FSPageTemplate instance at 01ADAA28></td></tr><tr valign="top" align="left"><th>URL</th><td>'http://www.exhibit.com.au/testsite2/finish_portal_construction'</td></tr><tr valign="top" align="left"><th>BASE2</th><td>'http://www.exhibit.com.au/testsite2'</td></tr><tr valign="top" align="left"><th>BASE0</th><td>'http://www.exhibit.com.au'</td></tr><tr valign="top" align="left"><th>URL0</th><td>http://www.exhibit.com.au/testsite2/finish_portal_construction</td></tr><tr valign="top" align="left"><th>URL1</th><td>http://www.exhibit.com.au/testsite2</td></tr><tr valign="top" align="left"><th>URL2</th><td>http://www.exhibit.com.au</td></tr><tr valign="top" align="left"><th>BASE0</th><td>http://www.exhibit.com.au</td></tr><tr valign="top" align="left"><th>BASE1</th><td>http://www.exhibit.com.au</td></tr><tr valign="top" align="left"><th>BASE2</th><td>http://www.exhibit.com.au/testsite2</td></tr><tr valign="top" align="left"><th>BASE3</th><td>http://www.exhibit.com.au/testsite2/finish_portal_construction</td></tr></table><h3>environ</h3><table><tr valign="top" align="left"><th>HTTP_ACCEPT_ENCODING</th><td>'gzip, deflate, compress;q=0.9'</td></tr><tr valign="top" align="left"><th>channel.creation_time</th><td>1039498708</td></tr><tr valign="top" align="left"><th>SERVER_PROTOCOL</th><td>'HTTP/1.0'</td></tr><tr valign="top" align="left"><th>SERVER_PORT</th><td>'8080'</td></tr><tr valign="top" align="left"><th>PATH_INFO</th><td>'/VirtualHostBase/http/www.exhibit.com.au:80/clients/VirtualHostRoot/testsite2/finish_portal_construction'</td></tr><tr valign="top" align="left"><th>HTTP_HOST</th><td>'192.168.0.16:8080'</td></tr><tr valign="top" align="left"><th>REQUEST_METHOD</th><td>'GET'</td></tr><tr valign="top" align="left"><th>PATH_TRANSLATED</th><td>'\\VirtualHostBase\\http\\www.exhibit.com.au:80\\clients\\VirtualHostRoot\\testsite2\\finish_portal_construction'</td></tr><tr valign="top" align="left"><th>HTTP_VIA</th><td>'1.1 www.exhibit.com.au'</td></tr><tr valign="top" align="left"><th>HTTP_COOKIE</th><td>'SITESERVER=ID=c46e8ab759ce0780b7c83d6dd59ee9f5; sql_pref__rows="20"; sql_pref__cols="40"; __ac_name="matthew"; show_filter_form="1"; tree-s="eJzTiFZ3hIKAiHRb9VgdTQAwIwTY"'</td></tr><tr valign="top" align="left"><th>SCRIPT_NAME</th><td>''</td></tr><tr valign="top" align="left"><th>SERVER_SOFTWARE</th><td>'Zope/(Zope 2.5.1 (binary release, python 2.1, win32-x86), python 2.1.3, win32) ZServer/1.1b1'</td></tr><tr valign="top" align="left"><th>HTTP_ACCEPT_LANGUAGE</th><td>'en-us, en;q=0.50'</td></tr><tr valign="top" align="left"><th>HTTP_ACCEPT</th><td>'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1'</td></tr><tr valign="top" align="left"><th>REMOTE_ADDR</th><td>'192.168.0.1'</td></tr><tr valign="top" align="left"><th>HTTP_REFERER</th><td>'http://www.exhibit.com.au/manage_addProduct/CMFDefault/addPortal'</td></tr><tr valign="top" align="left"><th>SERVER_NAME</th><td>'your-8gzc7wme2m'</td></tr><tr valign="top" align="left"><th>GATEWAY_INTERFACE</th><td>'CGI/1.1'</td></tr><tr valign="top" align="left"><th>HTTP_USER_AGENT</th><td>'Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.2) Gecko/20021126'</td></tr><tr valign="top" align="left"><th>HTTP_ACCEPT_CHARSET</th><td>'ISO-8859-1, utf-8;q=0.66, *;q=0.66'</td></tr></table>, 'root': <Application instance at 023DBCB0>, 'template': <FSPageTemplate instance at 01ADAA28>, 'traverse_subpath': [], 'user': matthew}) File C:\PROGRA~1\WebSite\lib\python\TAL\TALInterpreter.py, line 158, in __call__ File C:\PROGRA~1\WebSite\lib\python\TAL\TALInterpreter.py, line 191, in interpret File C:\PROGRA~1\WebSite\lib\python\TAL\TALInterpreter.py, line 523, in do_useMacro File C:\PROGRA~1\WebSite\lib\python\TAL\TALInterpreter.py, line 191, in interpret File C:\PROGRA~1\WebSite\lib\python\TAL\TALInterpreter.py, line 474, in do_loop_tal File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\TALES.py, line 233, in setRepeat File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\TALES.py, line 247, in evaluate File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\Expressions.py, line 198, in __call__ File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\Expressions.py, line 193, in _eval File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\Expressions.py, line 93, in render (Object: breadcrumbs) File C:\PROGRA~1\WebSite\lib\python\Products\PageTemplates\ZRPythonExpr.py, line 75, in call_with_ns (Object: __render_with_namespace__) File C:\Program Files\WebSite\lib\python\Products\CMFCore\FSPythonScript.py, line 83, in __render_with_namespace__ (Object: breadcrumbs) File C:\PROGRA~1\WebSite\lib\python\Shared\DC\Scripts\Bindings.py, line 266, in __render_with_namespace__ (Object: breadcrumbs) File C:\PROGRA~1\WebSite\lib\python\Shared\DC\Scripts\Bindings.py, line 283, in _bindAndExec (Object: breadcrumbs) File C:\Program Files\WebSite\lib\python\Products\CMFCore\FSPythonScript.py, line 122, in _exec (Object: breadcrumbs) (Info: ({}, (), {}, (1,))) File Script (Python), line 4, in breadcrumbs TALESError: exceptions.NameError on global name 'context' is not defined in "standard:'here/breadcrumbs'", at line 241, column 4

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DTML w/o acquisition?
by Terry Hancock 10 Dec '02

10 Dec '02

If in the torrent of messages you happened to notice ;-D, I'm implementing a class wrapper around an SQL result within a Zope product -- this now works thanks to the kind suggestion by Chris McDonough. Now that the wrapping part works, I've exposed another problem -- the main sort of method I want is one that renders the data into HTML for display purposes (i.e. the object draws itself). I was planning to use DTML for this, seeing as that's what's used elsewhere in the application. But when I try to render/run DTMLFile() methods in the wrapper I get complaints about acquisition failures (an error occurs in aq_parent()). Now I could probably go through some hoops to make acquisition happen (that is, give the object an acquisition parent) -- but actually, I don't need it -- all the variables I want rendered are attributes of the wrapper class. If I wanted to, I could give up on DTML and just use a Python format string. myform = """My stuff with %(data) inserted.""" % locals() instead of myform = DTMLFile("dtml/myform", globals(), **locals()) where dtml/myform is: """ My stuff with &dtml-data; inserted. """ However, that would break the "minimize the languages" rule -- I'd now have to use two different template systems in the same product. (I mainly mention it to prove the point that I don't need acquisition). Can I invoke DTML w/o invoking the acquisition mechanism (or at least tell the acquisition mechanism not to try to find a parent for my class)? I don't see how one could do this with DTMLFile, is there a way by actually invoking the DTMLMethod() constructor? Thanks for any suggestions! Terry -- Terry Hancock ( hancock at anansispaceworks.com ) Anansi Spaceworks http://www.anansispaceworks.com "Some things are too important to be taken seriously"

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Access error trying to use pyRXP example wrapper from an external method
by Jean Lagarde 10 Dec '02

10 Dec '02

Hi all, I'm a bit rusty on Zope and Python (was never that good to start with...), and I was hoping to be able to do something quick this evening but I've hit a brick wall. I have the following very simple external method: def niceXML(XMLstring): import pyRXP import xmlutils tree = pyRXP.Parser().parse(XMLstring) return xmlutils.TagWrapper(tree) pyRXP is the parser provided by the ReportLab folks. I had used their example xmlutils wrapper before in straight Python and rather liked it, so I wanted to use it from Zope using the external method above. However, although I can call the external method and get the wrapper object from Zope, everytime I try to use the object within Zope (e.g. object[0], object.TagName, etc.), Zope returns the error "Not allowed to access <0, or TagName, or etc.> in this context". I assume it has something to do with how the xmlutils wrapper works, but I haven't dared look at the code yet. Anybody has any pointer as to what might be wrong here to make my troubleshooting job a bit easier (and faster!)? Thanks ahead, Jean

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Re: [Zope] Intel vs AMD
by Dennis Allison 10 Dec '02

10 Dec '02

Re: the AMD Server. It's a 2U unit with HUGE air throughput because of the heat problem. It was done for us at CCSI in Atlanta. It is not a noise friendly system, but just fine in a colocation environment. Frequency based thermal management is somewhat self-defeating, but it is fail-safe. What you really have to do is increase the cooling... I don't have a comparable Intel processor machine, but I do run a P-II 60MHz machine (P-II with a repaired FPU) running an ancient version of Linux which serves a few low traffic websites. It's uptime seems to be limited only by the frequency of successful intrusions and/or power failures. I don't have any experience with RH8.0 on the Athlon machines. RH8 is a major change so I will wait a while for it to stablize... -d

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Re: [Zope] Intel vs AMD
by Dennis Allison 10 Dec '02

10 Dec '02

I have been running a dual processor AMD Athlon server with a 760-based Tyan motherboard, 2GB memory, 100GB disk, Redhat Linux 7.3 without problem. I've watched for but have not seen any problems with the global interpreter loc. The workload seems to distribute over the processors without any problems. Uptime is currently a something like 5 months. We support several thousand users using Zope. The original installation of RH7.3 was painful because interrupts were being directed to the wrong processor on intial load. Getting the intial load required the use of the magical, undocumented flag '-isys' at load-boot time.

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RE: TransparentFolder (was: Re: [Zope] Help! I need an old Debia n package.)
by sean.upton＠uniontrib.com 10 Dec '02

10 Dec '02

TFs are evil. They are the wrong solution to a real problem. A better solution for clutter is the CMF skins tool. Even if you only use the CMF to get the skins tool and put a non-CMF zope application within a portal folder, this is much better than using TFs. In Zope 2.3, TFs will break sessioning with CoreSessionTracking becuase of an id collision for browser id managers. I assume this is also true of more modern Zope versions. The skins tool will do for most people what they intended to do with TFs, but in a less surprising, and well-documented way (plus you get configurable layering, and concurrent software upgrade migration paths by developing TTW code in another skin than your production application deployment). Sean -----Original Message----- From: Kyler Laird [mailto:Kyler@Lairds.com] Sent: Tuesday, December 03, 2002 4:50 PM To: Jo Meder Cc: zope(a)zope.org Subject: Re: TransparentFolder (was: Re: [Zope] Help! I need an old Debian package.) On Wed, Dec 04, 2002 at 01:09:43AM +0100, Jo Meder wrote: > I'd second TransparentFolder as a feature request for Zope. They are > really useful to structure storage without complicating URLs if you know > what you're doing. Of course you have to be careful wrt duplicate ids. As I recall, they cause horrible (processing) inefficiencies, so they are not likely to be adopted in the base product. The human efficiencies they bring (to us) are substantial. I've been assuming that I'm the only one using TFs, so it's nice to know someone else does. More people to share the load if we ever need to modify the product to handle a change in Zope! Now for my TF usage... It's become *very* common for me to create a Folder such as "proposals" and fill it with other Folders that represent proposals. Then I want tools that act on the proposals (like "PDF_compilation"). It's sooo clean for me to be able to drop a TF named "tools" into "proposals" and then simply call it like this. http://.../blah/proposals/2002001/PDF_compilation I do this all the time. It would be hard for me to go back to a non-TF world. --kyler _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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type(sql_search())?
by Terry Hancock 10 Dec '02

10 Dec '02

Can anybody tell me what this mysterious "results object" thing actually is? I'm working from within a Zope product, and defining an SQL() method (same as "ZSQLMethod" created within the ZMI). I then call the method and get a "list of results". Okay, that's a list, but what are its elements? Aren't they "class instances"? Why don't they have a __dict__? What *is* this beast, and why isn't it something simple? I was actually trying to forgo the ridiculously cumbersome path of defining a "pluggable brain" with module and class name and passing it to the "advanced management" interface of my ZSQLMethod -- i.e. pretending I'm doing everything through the web. It seems like that really ought not to be necessary in product code. You ought to be able to just slap the wrapper on right in the code, without setting up all that boilerplate, e.g.: class my_wrapper: def __init__(self, sqlres): self.__dict__.update(sqlres.__dict__) my_form = DTMLFile('www/my_form', globals()) def some_method(self, foo): return self.sql_stuff + foo wrapped_results = [my_wrapper(r) for r in sql_search()] However, that "sqlres.__dict__" chokes, because, mysteriously, sqlres doesn't have one. I've had a look at RDB.py, and it sure looks like it ought to have __dict__, but experimentation says no. I thought I'd just run type() on it, and see what Python thinks it is, but that brings up another pet peeve about Zope: Why doesn't type() work correctly in Zope? Or rather, why doesn't it have a repr()? Running debugging code like: raise ValueError("My type is %s!" % repr(type(buggy_object))) returns a Zope traceback page which says: Error Type: ValueError Error Value: My type is! >From the Python command line, of course, this will tell me what the type of the object is, such as: >>> raise ValueError("%s" % type(a)) Traceback (most recent call last): File "<stdin>", line 1, in ? ValueError: <type 'class'> but not in Zope. Any help would be much appreciated! Terry -- Terry Hancock ( hancock at anansispaceworks.com ) Anansi Spaceworks http://www.anansispaceworks.com "Python takes the pain out of programming ... ... and Zope puts it back again."

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Best practices to write business apps?
by Frederic Faure 09 Dec '02

09 Dec '02

Hi, I'm back to playing with Zope, except this time I need it as a tool to rewrite business apps (payroll, in this case.) I've read the New Riders book along wit the online Zope Book. I understand that DTML is evil and that new users should prefer ZPT. Anyway, is there a good document for newbies that come from procedural languages like VB that would show them how to get up to speed? I need to understand how to separate logic and presentation as cleanly as possible. I'm actually still wondering which framework to use (Midgard, Enhydra, etc.) Thx Fred.

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