March 2000 - Zope - Zope lists

Methods - inheritence vs acquisition
by Cary O'Brien 08 Mar '00

08 Mar '00

Ok, I've gotten pretty far with Zope this time. But (of course), I've got a bunch of questions. Starting with... 1) What is the algorithm for determining which method to call? The DTML documentation says "attributes, including inherited and acquired attributes, of the client passed in the call to the document template are searched" But in what order? There can be an index_html in the class, in a parent class, or somewhere up the acquisition tree. Which takes precedence? Does the product that a ZClass have anything to do with the search? What about Z-Super-Classes? Inquiring minds want to know. 1a) Why can't I have a method in a ZClass, but then override it in the instance? I.E. (Gaak, it has been a while since I've had to even think about C++) virtual methods? (Or have I got that wrong). 2) It seems that the examples require the user to generate forms by hand, which seems unnecessary. For example, (after a protracted struggle with the underlying python code) I wrote a method that would create an html table for any query, ripping the column names and data out of the result object. 2.1) Shouldn't this be a standard part of Zope? 2.2) If so, do you want this code? 2.2) Likewise for property edit forms. I did find some DTML that would do this, but shouldn't this be standard. 3) Anyone want to help me whip snmpy into shape and create soem nice Zope classes for accessing SNMP variables and tables in routers and such? Enough for now... -- cary cobrien(a)radix.net

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RE: [Zope] Malicious HTML
by Marcus Collins 08 Mar '00

08 Mar '00

Or, use something like w3m http://ei5nazha.yz.yamagata-u.ac.jp/~aito/w3m/eng/index.html to take the html and turn it into plaintext. Pop it into an external method something like the following, and it should do the trick: ---html2msg.py from popen2 import popen2 def html2msg(htmlstring): try: (r, w) = popen2('/usr/local/bin/w3m -dump -S -cols 70 -T "text/html"') w.write(htmlstring) w.close() s = r.read() r.close() return s except: return 'Error converting article to plaintext.' --- It's an ugly hack, and you lose things like <br> and <p>, so you may want to replace \n with <br> afterwards. It does, however, do a brilliant job layout-wise: tables and lists remain fairly well formatted, for example. hth, -- Marcus > -----Original Message----- > From: Evan Simpson [mailto:evan@digicool.com] > Sent: 08 March 2000 15:06 > To: Michel Pelletier; Graham Chiu > Cc: zope(a)zope.org > Subject: Re: [Zope] Malicious HTML > > > ----- Original Message ----- > From: Michel Pelletier <michel(a)digicool.com> > > Graham Chiu wrote: > > > > > > I wish to allow users to enter comments into my database > which are then > > > viewable thru the browser. > > > > > > Is there a Zope function that I can pass their text thru > to remove all > > > HTML? > > > > Nope. There may be some standard python library module that I don't > > know about, however. Otherwise, you will have to write your own. > > On the other hand, if you tell the user up front that HTML > tags are not > allowed, you can simply html_quote the text. That will > prevent any tags > from rendering, and prevent normal uses of '<>&' characters > from breaking > anything. > > Cheers, > > Evan @ 4-am & digicool > > > _______________________________________________ > 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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Performance and Concurrency
by Cary O'Brien 08 Mar '00

08 Mar '00

I was reading the thread about Zope vs AOLServer and performance and threading and all that. I've done some work with other interpreters embedded in the apache child processes (tcl, mod-perl) so I started wondering if this would work for zope. Somewhere I think there is a Python interpreter embedded a'la mod-perl. If not, I'm pretty sure it can be done without too much grief, using mod-perl and mod-dtcl as starting points or examples. It seems to me this would allow utilization of multiple processors, esp for apps with a database backend, since the work would be split up over n frontend apache server processes and n backend database processes (at least for oracle an PostgreSQL)[1]. All without worrying about threading... But... What happens when multiple processes attempt to access the zame ZODB Data.fs file? Is it multi-process safe? Thread safe? How big are the sections protected by the mutexes? (or more importantly how long do they take to execute). Thanks, -- cary [1] m apache talking to n database backend process, m > n, might be even nicer in some cases. Gotta write that PostgreSQL backend multiplexor someday.

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Random Choice from SQL Method
by Jatwood＠bwanazulia.com 08 Mar '00

08 Mar '00

I am trying to pick a random element from a SQL Method (list) I got this far: <dtml-var expr="_.whrandom.choice(sqlMethodNamet())"> and get... <r instance at 87183a8> I know I a missing the boat in some way in terms of OO and lists but I find this a bit different than my usual Python programming. Any help would be great. Thanks, JMA

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Zope-edu lives!!
by Timothy Wilson 08 Mar '00

08 Mar '00

Hi everyone, I wanted to let everyone know that after a couple months of listserv trouble (and busy schedules) Zope-edu is back in business. We've set up shop at Sourceforge.net, and you can find the group's page at http://sourceforge.net/project/?group_id=3093 In addition, our Zope-powered page with more information and a Squishdot community forum can be found at http://www.zschool.org/ For those of you who haven't heard of us before, Zope-edu is a group of people involved with or interested in using Zope as a tool in education. We're an international group with interests that span the educational spectrum. You (that's right, I'm talking to you) are invited to join our listserv and participate in planning, coding, promoting, or doing whatever you do best. -Tim -- Tim Wilson | Visit Sibley online: | Check out: Henry Sibley HS | http://www.isd197.k12.mn.us/ | http://www.zope.org/ W. St. Paul, MN | | http://slashdot.org/ wilson(a)visi.com | <dtml-var pithy_quote> | http://linux.com/

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getting object reference from an id string?
by Darran Edmundson 08 Mar '00

08 Mar '00

Say one has an object reference and knows the string id of a child node. From this info, we want an object reference to the named child. I'd like someone to prove me wrong that there is not a one-liner to accomplish this seemingly trivial task. I've had to resort to (off the top of my head) code like: <dtml-in "objectValues(['child meta-type'])"> <dtml-with sequence-item> <dtml-if "id == desired_id"> <dtml-call "REQUEST.set('desired_ref',_['sequence-item'])"> </dtml-if> </dtml-with> </dtml-in> I'm really looking for a solution that doesn't require looping. Since Zope enforces unique id's at a given level, the name should be sufficient to resolve the child object. Darran.

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Re: [Zope] getting object reference from an id string?
by Rik Hoekstra 08 Mar '00

08 Mar '00

Darran Edmundson wrote: > > Say one has an object reference and knows the > string id of a child node. From this info, we > want an object reference to the named child. > wouldn't <dtml-var "_.getitem('<desired_ref>').<whateverproperty>"> get you what you want? rik

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Sort order
by Kiran Jonnalagadda 08 Mar '00

08 Mar '00

I can use "sort_order=reverse" to get a reverse sorted list in ZCatalog. What's the equivalent for dtml-in? sort_order doesn't work and I can't find anything else in the docs. -- Kiran Jonnalagadda http://lunateks.com baby.sh: while true; do echo "^G^G^G^G^G"; sed -e 's/food/poop/'; sync; sync; sleep 15; done

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worldpilot 1.0?
by ethan mindlace fremen 08 Mar '00

08 Mar '00

Zopistas, I'd really like to give worldpilot a spin, but the FTP site seems to be AWOL. Could someone be so kind as to drop me a copy or let me know where I could find it? Thanks, -- ethan fremen - mindlace(a)imeme.net good design is as close as I want to get to ideology.

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Tree-expand bug!?
by Petr Knapek 08 Mar '00

08 Mar '00

Hi Zopists, I have tried to expand tree and a Zope error has appeared. Below, you can see setting up of expand_all variable together with the beginning of my tree. The collapse_all is working without any problem, the tree collapses when the collapse_all is set up to '1'. The problem is only with the expand_all. Is it Zope bug or something wrong on my side? part of my code <A HREF="<dtml-var URL0>?expand_all=1"><IMG SRC="/p_/pl" ALT="Expand" BORDER="0"> <dtml-tree branches_expr="objectValues(['Folder', 'DTML Document', 'File', 'Image'])" skip_unauthorized=1 sort=is_sort_objects> Zope Error Zope has encountered an error while publishing this resource. Error Type: KeyError Error Value: branches Troubleshooting Suggestions This resource may be trying to reference a nonexistent object or variable branches. The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Traceback (innermost last): File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 179, in publish File /usr/lib/zope/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: ElementWithAttributes) File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 165, in publish File /usr/lib/zope/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: is_tree_manage) File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: is_tree_manage) File /usr/lib/zope/lib/python/OFS/DTMLMethod.py, line 145, in __call__ (Object: is_tree_manage) File /usr/lib/zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: is_tree_manage) File /usr/lib/zope/lib/python/TreeDisplay/TreeTag.py, line 154, in render (Object: a tree tag) File /usr/lib/zope/lib/python/TreeDisplay/TreeTag.py, line 210, in tpRender (Object: ElementWithAttributes) KeyError: (see above) Thank you, Petr -- Petr Knápek PVT.NET, e-mail: petr.knapek(a)pvt.net, tel:+420-5-41 558 394 PVT a.s. - pvt.net, Veveří 102, 659 10 Brno, Czech Republic

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