October 1999 - Zope-Dev

DTML Zclass ID bug - HELP!
by Anthony Pfrunder 17 Oct '99

17 Oct '99

Hi, I've run into a really annoying bug and was wondering if it is fixed in the CVS version (I don't have direct internet access to check). Create a new Product containing a Zclass subclassing from the DTML Document or Method. Add a Python or DTML Method which does: This document is <dtml-var id> Then, add an instance of this Zclass. When you VIEW it you get: This document is <cstring ...> AND when you edit it the ID is empty. All references to the ID and related internal variables return CSTRING or cause tracebacks. How do i get the REAL id? Also, I can get the unprocessed content via self.read() but how do I get the processed data? repr, `..` and index_html all give weird tracebacks. This is stopping me from finishing a JavaScript XMLWidget for XMLWidgets release 2 so any help would be greatly appreiated. Just a thought - what about adding a Storage/Zclass mixin class for people doing combo Product / ZClass systems. Hence, the ZClass gets stored within a ZODB in the appropiate Product directory hence reducing installation hassles. This also means we can just zip up the Product directory to automatically include ZClasses [looks at the ZODB experts on Zope-dev]. Cheers, Anthony Pfrunder

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load_site patch2 draft1
by Oleg Broytmann 17 Oct '99

17 Oct '99

Hello! Attached is next version of load_site.py. In addition to my previous patches, this one adds capability to preserve META tags as DTML Document's properties. Note! META tags currently stored, but not restored. Either you need to develop your own machinery for this, or wait until I do it. I think I'll spent some time for this, as I need to find a more general approach to store information from <HEAD></HEAD>, in particular, I want to preserve <LINK>, <STYLE> and <SCRIPT> tags. Oleg. ---- Oleg Broytmann National Research Surgery Centre http://sun.med.ru/~phd/ Programmers don't die, they just GOSUB without RETURN.

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Pack error and corruption
by Pavlos Christoforou 16 Oct '99

16 Oct '99

Hello Zopistas - While I was attempting to perform a pack operation I got the following error: <!-- Traceback (innermost last): File /usr/local/Zope-2.0.0b1-src/lib/python/ZPublisher/Publish.py, line 256, in publish_module File /usr/local/Zope-2.0.0b1-src/lib/python/ZPublisher/Publish.py, line 161, in publish File /usr/local/Zope-2.0.0b1-src/lib/python/ZPublisher/mapply.py, line 154, in mapply (Object: manage_pack) File /usr/local/Zope-2.0.0b1-src/lib/python/ZPublisher/Publish.py, line 98, in call_object (Object: manage_pack) File /usr/local/Zope-2.0.0b1-src/lib/python/App/ApplicationManager.py, line 333, in manage_pack (Object: ElementWithAttributes) File /usr/local/Zope-2.0.0b1-src/lib/python/ZODB/DB.py, line 442, in pack File /usr/local/Zope-2.0.0b1-src/lib/python/ZODB/FileStorage.py, line 844, in pack (Object: /usr/local/Zope-2.0.0b1-src/var/Data.fs) Pack Error: 8984226 It also corrupted the database and I had to manually truncate Data.fs I could not reproduce the error but I kept a copy of the corrupted Data.fs in case someone from DC wants to take a look. Pavlos

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More comfortable DTML editing ?
by Andreas Jung 16 Oct '99

16 Oct '99

Editing DTML in a textarea input is very annoying. Will there be a better solution in the future of Zope ? Andreas

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Re: [Zope-dev] Multi-Format Interface
by Kevin Dangoor 15 Oct '99

15 Oct '99

-----Original Message----- From: Michel Pelletier <michel(a)digicool.com> To: Toby Dickenson <htrd90(a)zepler.org> Cc: Loren Stafford <lstafford(a)icompression.com>; zope-dev(a)zope.org <zope-dev(a)zope.org> Date: Wednesday, October 13, 1999 3:19 PM Subject: [Zope-dev] Re: [Zope] Can't add "date" property to new ZClass >I'm working on a model and elaboration of what I call MFI, Multi-Format >Interface, which will be a component of the Portal Toolkit and possible >a future core feature of Zope. Basicly, this consolidates all of the >document types, DTML, XML, PDF, what-have you, into a subclassable >interface that allows you to define pluggable format types. [snip] > >This is a pretty light description, but there are many other benefits >I'm formalizing into a document right now. What are you thoughts? As I've been gearing up to do an increasing amount of Flash lately, I've been considering making a Flash document object (either in python or ZClasses... I hadn't really decided). The requirements I would have for Flash might a bit different from the other cases you've been considering. Here are some of the things I was thinking of: * The object should contain the Flash .swf file and an option .gif/.jpg/.png to display for people who are Flash-impaired * Properties would parallel the Flash publishing options. These are things like Loop, size of movie (in pixels or percent), etc. * Option to display the flash in the current browser window or open a new window. (I've been doing some "full-screen-ish" movies lately... these work a lot better in a separate window). Opening a new window might involve referencing another "web page" that is served up by the Flash object. I was not planning to incorporate Flash detection in the object itself, but I think that would be desirable. I am in no way insinuating that DC write this thing :) I think that MFI sounds *great* and I'd like to see the API provide the hooks necessary to handle something like Flash, since Flash can get kind of convoluted in how you use it. Kevin p.s. I'm still waiting breathlessly for that shameless ZPT propoganda you promised!

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Re: [Zope-dev] Re: [Zope] Question about ZODB and threads
by Martijn Pieters 15 Oct '99

15 Oct '99

At 17:50 14/10/99 , Pavlos Christoforou wrote: >I am familiar with the model Martijn, however the whole point of the story >is *not* to register the change with the ZODB. Sorry Pavlos. I did not mean to imply that you were not a seasoned Zope developer (I know you've been playing with it before I even knew about it). >It would be nice if I could >have a temporary in memory storage, accessible from all the threads and >this used to be a simple matter in the pre-concurrent era. Anyway you >have answered my question, ie each thread gets a copy of the class >instance. Do you think I can get away by creating a class that >participates in transactions and where instances of this class modify some >class attribute, like: > >class InMemory: > > dict_visible_from_all={} > > def set(self,k,v): > self.dict_visible_from_all[k]=v > > (transaction and garbage collection code ommited) > > >Are class attributes deepcopied too for each thread? (in which case it >won't solve my problem). If not would such >operations (ie calling an instance set method) be thread safe? This won't solve your problem. Either you manage to convince the ZODB that your object is still clean, and won't get stored (no access for other threads), or if you tell the ZODB it is dirty, you get stored _including_ your dict, and you create another transaction for the instance. >I also noticed a module for in memory storage in the ZODB directory, but >I am not sure how to combine the regular FileStorage with the in memory >one. How about creating a module level instance of a MemoryStorage ZODB for your product's use? Any instance of your product can call a method in the module that'll return a new connection to the storage, and store that into a _v_ variable. That way any thread safety is taken care of by your product ZODB. You'll only have to code for the ConflictError exception. -- Martijn Pieters, Web Developer | Antraciet http://www.antraciet.nl | Tel: +31-35-7502100 Fax: +31-35-7502111 | mailto:mj@antraciet.nl http://www.antraciet.nl/~mj | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 ------------------------------------------

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Re: [Zope] Question about ZODB and threads
by Martijn Pieters 15 Oct '99

15 Oct '99

At 04:07 14/10/99 , Pavlos Christoforou wrote: >Hello Zopistas - > >Suppose we have a persistent object registered with ZODB which has a list >attribute contents. According to ZODB rules we should treat mutable >attributes as immutable, but what happens if we are crazy enough to treat >them as mutable and do things like: > >self.contents.append('crazy') > >Had we treated it as immutable we would have done something like: > >tmp=self.contents >tmp.append('not so crazy') >self.contents=tmp > > >in which case tmp is local to the thread and the last statement triggers >ZODB's thread-safe transaction mechanism. However in the first case ZODB >is unaware of the modification. This was not a problem before the >concurrent ZODB, but I am not sure what would happen if two threads call >this function simultaneously. Any ideas? (No it is not a theoretical >question. Such a construct can be very useful in many situations where you >might want to store data in memory temporarily.) (I moved this to Zope-Dev). First of all: two threads each get their own copy of the class instance, so you are safe there, they will not interfere with each other. It is at commit time to the DB that things might conflict, but that's where the ZODB has it covered. The fact that the ZODB isn't aware of the change will only cause it not to be committed. Your change will not be visible in any other thread, and will be gone as soon as the object is removed from memory (at least, that's my understanding). You can make the ZODB aware of the changes you made by either changing a mutable on the object, or by setting _p_changed to a true value. Either way the object will be registered with the current transaction and the changes will go though the normal ZODB machinery, including conflict resolution. All this can be found in the ZODB UML model at: http://www.zope.org/Documentation/Developer/Models/ZODB especially, Persistent Objects (top left frame) -> Persistent (bottem left frame) and then read the bottom right frame. Don't you love this setup? =) -- Martijn Pieters, Web Developer | Antraciet http://www.antraciet.nl | Tel: +31-35-7502100 Fax: +31-35-7502111 | mailto:mj@antraciet.nl http://www.antraciet.nl/~mj | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 ------------------------------------------

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[Newbie] #tree tag - help!
by Ian Clarke 15 Oct '99

15 Oct '99

I have been trying to create a site making use of the #tree tag. To get started I tried to follow the "Inplementing a navigation tree" section of the Zbook tutorials, although I have removed some superfluous stuff in an effort to track down the bug. Everything seems to display correctly when I initially view the page (a tree of my "Outline" folder is displayed), however whenever I click on any of the sub-folders I get the error which you can find at the end of this email. Here is my "ll_menu" code (I suspect the problem is in here somewhere): <SPAN CLASS="tree">   <dtml-var id>  <A HREF="/?tree-s=&tree-e=&tree-c="></a>   </SPAN> Can anyone give me a pointer as to what is going wrong? Any help would be much appreciated, this problem is giving me a headache! Also, on a general point - is there any effort being made to make the error reporting system more newbie friendly? Ian. Traceback (innermost last): File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 179, in publish File /home/zope/Zope/lib/python/Zope/__init__.py, line 201, in zpublisher_exception_hook (Object: ElementWithAttributes) File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 165, in publish File /home/zope/Zope/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: main) File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: main) File /home/zope/Zope/lib/python/OFS/DTMLDocument.py, line 166, in __call__ (Object: main) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: main) File /home/zope/Zope/lib/python/OFS/DTMLMethod.py, line 141, in __call__ (Object: standard_html_header) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: standard_html_header) File /home/zope/Zope/lib/python/OFS/DTMLDocument.py, line 162, in __call__ (Object: ll_menu) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: ll_menu) File /home/zope/Zope/lib/python/TreeDisplay/TreeTag.py, line 151, in render (Object: Outline) AttributeError: __call__ -- Ian Clarke Email: I.Clarke(a)strs.co.uk Homepage: http://www.gnu.demon.co.uk/ Also see: http://freenet.on.openprojects.net/ "All we see and all we seem is but a dream within a dream" _______________________________________________ Zope maillist - Zope(a)zope.org http://www.zope.org/mailman/listinfo/zope (Related lists - please, no cross posts or HTML encoding! To receive general Zope announcements, see: http://www.zope.org/mailman/listinfo/zope-announce For developer-specific issues, zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev )

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Adding math functions to VSEval
by kent＠tiamat.goathill.org 14 Oct '99

14 Oct '99

Is it possible to add std math functions to VSEval's namespace? I can override the builtin namespace, etc, and include python's math functions in the same namespace, but eval can't seem to locate them. What am I missing? Thanks

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Zope Errors
by Jason Spisak 14 Oct '99

14 Oct '99

Zopsters, I am looking at the on screen/log output of Zope 2 and I see a ton of 'Broken Pipe' and 'Bad File Descriptor' errors. What do they mean? Is it a sign of corruption? All my best, -- Jason Spisak webmaster(a)hiretechs.com

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