- Zope-Dev - Zope lists

Re: [Zope-dev] Trying to design a PythonMethod Product
by Christopher Petrilli 13 Aug '99

13 Aug '99

I'll make some comments since we've tossed this around ENORMOUSLY in house and just haven't had the time to write it. It's really not that hard I think, but you do need to take into account some issues. > Basically, I plan to take an arbitrary chunk of Python code, wrap it in a > function definition, compile it, and then thrash the resulting bytecodes > with bytecodehacks (see http://starship.python.net/crew/mwh/bch/index.html) > This will serve the dual purposes of enforcing restrictions on what the code > can do, and bending the semantics for better Zope integration. Look at the expression machinery, it would be insane to duplicate security already implemented, and frustrating to have two separate "paradigms" for managing security. > 4. Restrict "import" to modules/packages found in a particular location, so > that 'safe' modules can be used. Take a look at rexec for this. > 5. Allow "while" and "for". Insert 'escape code' at the bottom of every > loop, to allow PythonMethods to 'time out' after some elapsed time or loop > count. Actually, we talked about just limiting the "instruction counter" so that you could catch anything that was taking an excessively long period of time to execute. Say 1M byte-codes? This avoids having to worry about individual flow constructs. > 6. Allow "print" to be used to generate rendered output by replacing it with > a function that accumulates text. If anything other than literal "None" is > returned, the collected "print" text is discarded, otherwise it becomes the > return value (on "return", "return None", and on implicit return, but not on > "x=None; return x", for example). Not sure how I like this honestly. I'd probably just bind sys.stdout.write to something new, that should cause print to work correctly. > 7. Either disallow "global", or redirect access to globals into a controlled > namespace. Look at management of namespaces in expressions. > 8. Provide the Zope standard builtins (and tags?) as builtins. Before carving that new wheel, take a look at the expression syntax. This would be very good starting point I think, as it already deals with crawling around the parse trees :-) Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli(a)digicool.com http://www.digicool.com

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Zope 2.0B4 WebDav rename lockups on Win32
by Brad Clements 13 Aug '99

13 Aug '99

Can anyone else recreate this? On NT 4.0 SP4 server, with IE5 client running Zope 2.0B4, Z2.py manual-start server 1. Create a folder in Zope via management interface 2. Use WebDav to open the folder from IE5 (ie, open as folder) 3. Open a regular Windows Browser and find a directory with about 30 .gif files 4. Drag and drop those .gifs into the WebDav folder so IE5 copies them to the Zope server (isn't that great!) 5. After the webdav folder finishes copying and refreshes, begin renaming individual images by right-click/rename in the IE5 webdav folder view. 6. On the fifth rename, the server "hangs". IE5 still shows "renaming", but Z2 does not respond. 7. CTRL-C (not CTRL-Break) causes Z2 to shut-down ok with "keyboard interrupt". I can recreate this at will, 5 renames, boom, zserver locks up. Can anyone else recreate this? Maybe it's a win32 thing, or an IE5 thing. Brad Clements, bkc(a)murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax netmeeting: ils://ils.murkworks.com ICQ: 14856937

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Date
by Anderson Ami 13 Aug '99

13 Aug '99

I need display the date (today) in my html, what is the command ? <!--#var expr=" ?????????? "> thanks a lot Anderson Brasil ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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Zope scheduler any one.
by Robin Becker 13 Aug '99

13 Aug '99

Any plans for a Zope scheduler ie a means of getting certain things done periodically. I would like to pack the database automatically fairly regularly, and periodically remove certain user folders and the like. -- Robin Becker

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Images
by Anderson Ami 13 Aug '99

13 Aug '99

How to create an image, which name is a variable ( a field in sequence ) and how a randomize a image in my dtml code, which name is a variable too ? Thanks a lot. Anderson São Paulo - Brasil ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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(no subject)
by Anderson Ami 13 Aug '99

13 Aug '99

How to create an image, which name is a variable ( a field in sequence ) and how a randomize a image in my dtml code, which name is a variable too ? Thanks a lot. Anderson São Paulo - Brasil ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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objectValues(spec) does not work!?
by Jonas Juselius 13 Aug '99

13 Aug '99

I have the following problem in dtml:  . . .  does not work! Neither does objectItems('[Folder]'), but a plain  works... I have looked at the code in ObjectManager.py and DT_Util.py, but can't figure it out... The errors I get are the following (without the traceback): Error Type: TypeError Error Value: call of non-function (type list) Help appreciated, jonas

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Picklists in forms (Newbie questions)
by kamon.ayeva＠bureauveritas.com 13 Aug '99

13 Aug '99

Hello, I would like to know how -in the Zope-dev way of doing- you create a picklist field in which a user can make a choice. To be more precise, I would like 2 scenarios: 1. Picklist of instances of an object, for example, of areas_of_interest (MATHEMATICS:ASTROLOGY:LITERATURE:ART). 2. Picklist of different objects such as (USERPROFILE:WORK:FAMILY:AREAS_OF_INTEREST) In this second case, the choice made would, for example, open a new form (DTML method/document ?) containing the properties of the object. Maybe you could redirect me to someplace in the documentation where I can find these concepts ? Maybe there are existing products implementing this. Thanks & All the best Kamon

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Advanced Tutorial for DTML
by Alexander Spanke 13 Aug '99

13 Aug '99

Hi, can anyone say me, where i can get a DTML-Tutorial, the Tutorial by Zope is very small, i need a advanced tutorial. regard A.Spanke

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ZODB manager project?
by David Kankiewicz 13 Aug '99

13 Aug '99

Has anyone been working on a interface that includes the size (size of undo's, etc.) of objects? There was a discussion awhile back that brought something like this up. I was wondering what the best approach to this would be and generally what people would want? Ideas like: object management (different management views with their sub items listed for direct singular access) more history/versions management directory/item packing options (for lets say publicly modifiable objects that need to be checked before the page/directory is packed) general views of the states of objects (in memory, on disk, version modified, etc) what attributes/objectIds are there what additional permissions would some of these require (if any)? Some of these ideas target larger sites that might allow different people to maintain areas of the web site. I know that most of the stuff is in Zope already and just needs to be worked with and interfaced. I'm just getting into python and Zope but would like to contribute were I can. Right now that includes working with Zope and Python (that includes learning to think in Python) to learn more about the internal objects, etc.. Any ideas and responses would be appreciated. David Kankiewicz P.S. All the web sites (like weblogs, sourceXchange.com etc., etc.), IMHO, would be so easy to implement with Zope, especially as it gets more organized preojects going :)

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