June 2001 - Zope-Dev

RE: DTML<->Python confusion (RE: [Zope] How to make a script return rendered dtml)
by Bjorn Stabell 14 Jun '01

14 Jun '01

Wow, thanks Evan. I should've asked these questions a long time ago... From: Evan Simpson [mailto:evan@digicool.com] > From: "Bjorn Stabell" <bjorn(a)exoweb.net> > > How do you do dtml-with and dtml-let in a Python script? (I.e. > > put something on the namespace) > > You can't. Scripts can use the DTML namespace in the same > way that Python expressions in DTML can, but that's it. > > On the other hand, you can create (and pass along) all the > local variables you want. Is it possible to append an object to the namespace? Isn't that what dtml-with does? > > How do you give positional (not keyword) arguments to a DTML > > method; is there any difference? > > Keyword arguments are put on top of the namespace. You can't > use positional arguments, except the standard (None, _) idiom. > DTML was never meant to pass arguments around, that's what > the namespace is for, for what that's worth :-P But the other way around, calling Python functions from DTML (via <dtml-var func>) the positional arguments are gotten from the namespace, right? [... good andswer to __call__ et al deleted :) ... ] > > When does RESPONSE need to be passed; it can always be gotten > > from the REQUEST, right? > > Right. So why do so many DTML methods / documents have REQUEST as an explicit argument? It looks like a convention that has to mean something. > > Are namespace, _, REQUEST, and context just different names for > > the same thing? > > Not quite. The namespace, accessible in DTML as "_", is a > pile of objects. > The REQUEST is a particular object created by ZPublisher to > hold information > about the request, such as form variables and URL > information. The context > (or client, for DTML) is the object on which the method was > called. If the > DTML Method is the target of the request, or if you pass a > client as the > first argument when calling it, the Method pushes it onto the > namespace. > Also, the context (like any other Zope object) is acquisition > wrapped. The > ultimate acquisition parent of any publsihed object is a > special wrapper for > REQUEST. All this means that when you ask the namespace for > the name "foo", > it will end up looking for it in the context, in the > context's containers > all the way to the root, and the REQUEST. I am a little bit confused about the fact that the acquisition path is related to how the document was called, not just to the containment relationships it is involved in. Or is it? myobj.aq_parent isn't necessarily the object that contains myobj? Is the namespace stack basically the same as the acquisition path? Bye, -- Bjorn

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TransparentFolderPatch and Security
by Andre Schubert 14 Jun '01

14 Jun '01

Hi all, I have found a bug with Transpüarent FolderPatch and ZopeSecurity. Let me explain my structure. root: folder 1: foo: bar: foobar: foo 1: bar 1: Let me say that folder 1 is a normal Folder, foo and bar and foo 1 and bar 1 are orignal TransparentFolders and foobar is my own Product which is a Foder with _is_transparent=1. The problem is, that ONLY if i want view the Security-Tab in folder 1 the following error occurs:  can anyone help or explain me what happens thanks as

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DTML<->Python confusion (RE: [Zope] How to make a script return rendered dtml)
by Bjorn Stabell 14 Jun '01

14 Jun '01

I've spent hours, maybe days, being confused about this as well. According to the Zope API documentation and ZDP at http://zdp.zope.org/projects/zfaq/faq/DTML/959888072 http://zdp.zope.org/projects/zsnippet/snippets/DTMLTags/CallingDTMLMetho ds someDTMLMethod(_.None, _) should work. Because of the unclear/complex calling conventions and integration between DTML and Python I've had to keep some code in DTML. Other related questions are: How do you do dtml-with and dtml-let in a Python script? (I.e. put something on the namespace) How do you give positional (not keyword) arguments to a DTML method; is there any difference? When is __call__ called, when is __str__ called, and when is index_html called? Other basic functions worth knowing about for a class/object to be a good-behaving Zope object? When does RESPONSE need to be passed; it can always be gotten from the REQUEST, right? Calling a DTML method, when to use client and when to use REQUEST? Is calling with client and REQUEST the same as adding client to the namespace (REQUEST) and calling it with an client=None? Are namespace, _, REQUEST, and context just different names for the same thing? I've been dreaming about a FAQ answering all of this (and a bunch of ZClasses questions I have). Me thinks the ZDP should be integrated with Zope.org, and all Zope.org members given access to add FAQs (I am not allowed to add FAQs now). Ideally, somebody should be adding FAQs all the time, and the FAQ index should be posted regularly to zope-dev... Btw, I think http://zdp.zope.org/projects/zfaq/faq/DTML/959888072 gets the order of aMappingObject and aClient wrong in the first code line. Bye, -- Bjorn -----Original Message----- From: Tim Hicks [mailto:tim@sitefusion.co.uk] Posted At: Thursday, June 14, 2001 00:15 Posted To: Zope List Conversation: [Zope] How to make a script return rendered dtml Subject: Re: [Zope] How to make a script return rendered dtml ----- Original Message ----- From: "Eric Balasbas" <ebalasba(a)bway.net> To: "Tim Hicks" <tim(a)sitefusion.co.uk> Cc: <zope(a)zope.org> Sent: Wednesday, June 13, 2001 4:33 PM Subject: Re: [Zope] How to make a script return rendered dtml > I'm not sure if this is the best way to do it, but if you want to render a > DTML method or DTML document inside a Python script, use the syntax: > > someDTMLMethod(_.None, _) I tried this: print context(_.None, _) and got this error: Error Type: NameError Error Value: _ So I tried context.id(_.None,_) and got the same. So I tried 'print context(None,_)', with the same error resulting. Finally, I have tried: print context(None,) and got Error Type: KeyError Error Value: standard_html_header This last error at least seems like it's on the right track as it is parsing through the text of the file. What's going wrong, any idea? thanks tim > Eric Balasbas > Senior Developer > eric(a)virtosi.com > > http://www.virtosi.com/ > Virtosi Ltd. > Design -- Branding -- Zope > > > On Wed, 13 Jun 2001, Tim Hicks wrote: > > > I have a ZClass (testclass) which subclasses DTMLDocument, and within this > > zclass, I have a script (python) called index_html. Obviously, this script > > is called each time an instance of testclass is requested. Based on the > > presence of a query string, I want to either return the document_src > > (although with a few modifications), or simply return the rendered > > instance... by this, I mean have all the dtml tags that are in the instance > > evaluated. So, my question is, how do I make Zope evaluate the dtml tags? > > > > Here is what I have so far in my script: > > > > ------------ > > if context.REQUEST.QUERY_STRING == 'editor': > > print context.raw > > else: > > print context > > > > return printed > > ------------ > > > > The 'else' statement simply gives me things like, > > > > <dtml-var standard_html_header> > > > > I also tried 'else: render(context)', which was simply a guess on my part, > > but I get a Zope error as follows: > > > > Error Type: AttributeError > > Error Value: validate > > > > Can anyone enlighten me? > > > > Cheers > > > > tim

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RE: [Zope-dev] a beginners question ...
by Loren Stafford 14 Jun '01

14 Jun '01

The quick answer is Yes. One method is described by http://www.zope.org/Members/lstaffor/ZClientMethod. You can also use XML-RPC. On the other hand, Zope is an integrated programming environment for web applications. It includes the capabilities offered by servlets within its programming system; DTML methods, Script (Python), Script (Perl), SQL Methods are all servlet-like functions. So you might ask yourself whether you couldn't do better inside Zope what the servlets are doing for you outside Zope. -- Loren -----Original Message----- From: zope-dev-admin(a)zope.org [mailto:zope-dev-admin@zope.org]On Behalf Of Brian Gorrie Sent: Wednesday, June 13, 2001 18:01 To: zope-dev(a)zope.org Subject: [Zope-dev] a beginners question ... Hi, Forgive my lack of Zope knowledge I am fairly new to Zope. Question: From zope can I take a block of text returned by a web link ( say some dhtml returned by a servlet ) and include that in the source of a web page. So I can build the sections of a web page through successive calls to Servlets ? Cheers, Brian.

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a beginners question ...
by Brian Gorrie 14 Jun '01

14 Jun '01

Hi, Forgive my lack of Zope knowledge I am fairly new to Zope. Question: From zope can I take a block of text returned by a web link ( say some dhtml returned by a servlet ) and include that in the source of a web page. So I can build the sections of a web page through successive calls to Servlets ? Cheers, Brian.

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OracleStorage with python 2.1
by Joshua Reynolds 13 Jun '01

13 Jun '01

Hey all, just to give you heads up, logged a bug (2301) inre DCOracleStorage. Seems that the all of the id's used to oracle are strings. The code that was doing the stringification of the bitstream ids was converting them to longs then stringifying them and expecting them to have that foul and heinous python 1.5.2 'L' on the end. Remove the slicing off of the L and you are good to go. On side note, I am a total oracle imbecile but is there any reason why the we are stringifying the id's in the first place? It seems like it would be more effecient to use the longs directly. Thanks, Joshua Reynolds

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cycles and mem leaks and Zpatterns..
by cs＠comlounge.net 13 Jun '01

13 Jun '01

Hi! As some of you might know, I still have my mem leak problem.. I've now looked again at some code and discovered some cycle in ZPatterns.. Means: I have a Price class and some PriceWinner class, which reference each other via some SkinScript. Could this lead to a leak then? I am not sure at the moment if the backlink to the price is used somewhere.. At least I will try to eliminate it now and maybe replace the price attribute in the winner class by some method which returns the price.. (hope, this is no problem then..) regards, Christian -- COM.lounge http://comlounge.net/ communication & design info(a)comlounge.net

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Zope Apache and Streaming
by Andre Schubert 13 Jun '01

13 Jun '01

Hi there, The last time if have tested Streaming with Zope and found out, that streaming only works if i call my Stream directly from Zope like, http://www.foo.com:8080/stream. The problem is, that there is Apache running at port 80, and my SysAdmin kills me if i kill the Apache and let Zope run on Port 80. Now ist there a way to stream Data from Zope through Apache, which means that a can call my stream like http://www.foo.com/zope/stream. I'am working with RESPONSE.write to stream data to the client. Can anyone help to solve this problem ?? thanks as

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Re: AW: jcNTUserFolder
by Jephte Clain 13 Jun '01

13 Jun '01

> Thank you for the tip with the access file. > The remote user mode with challenge\response works > perfect if I delete the Password of the access file. > > But, if I delete the Password of the access file I get a Zope Error > when I am not using the challenge\response mode. that is the point :-) As far as I know, it is not possible for Zope to run in remote user mode and normal mode together (they are mutually exclusive) I think that the solution is to run two Zope instances in a ZEO cluster (on the same machine), one which talks with PCGI (and so is in remote user mode) and one which serves directly the requests (and is not in remote user mode) perhaps someone on the list can give his opinion (note that i am not on the zope-dev list, so cc: any answer) > The error gets raised in your NTUserFolder.py in line 79 ( return > string.lower(login) ) > when login is None. (Anonymous login) > > I changed it to > > def _normalize(self, login): > """normalize a login name. > Currently, it is made lowercase > """ > if login is None: # modification > login = 'Anonymous User' # modification > return string.lower(login) > > This is a very ugly hack, but it works. You normally cannot login directly with Zope if it is running in remote user mode. At least, with your patch, one can browse the site anonymously regards, jephte.clain(a)univ-reunion.fr > -----Ursprüngliche Nachricht----- > Von: Jephte Clain [mailto:jephte.clain@caramail.com] > Gesendet: Freitag, 8. Juni 2001 14:25 > An: Roesch, Alexander > Betreff: Re: jcNTUserFolder > > > > we are using your product "jcNTUserFolder" in > challenge/response mode > > together with IIS on NT4 with Zope 2.2.2. > > It works perfect. > what version? is it 0.0.8 or 0.1.0? > > > Because of bugs in Zope 2.2.2 we want to migrate to Zope > 2.3 and > > "jcNTUserFolder 0.1.0" > note that 0.1.1 have been released > > > I managed to set up the the NT User Folder as acl_user > folder in the root > > level. > > Now I still have the problem that the users don't get > recognized by zope. > > They always get prompted for Username / Password / domain. > And even if they > > apply the correct Username / Pwd / domain they get > rejected. > > > > Could you give me a tip what is going wrong? > I need your answer to above questions. if migrating from > 0.0.x to 0.1.x, you have to follow the instructions given on > http://www.zope.org/Members/jephte/jcNTUserFolder/installation > > note: for remote user mode to work with zope 2.3.x, you > *must* have the access file. it is not installed by default > for Zope 2.3.x > > regards, > jephte.clain(a)univ-reunion.fr ______________________________________________________ Boîte aux lettres - Caramail - http://www.caramail.com

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explicit/controlled/filtered acquisition for Folders?
by Michael Halle 12 Jun '01

12 Jun '01

After dealing with using Zope for websites for two years, I've come to the point where I think implicit acquisition should be an optional feature when retrieving web content that looks less like objects and more like folders of documents. Implicit acquisition means that when you ask for "/folder1/folder2/folder3/mydoc.html", you might well get /mydoc.html . That might be useful in parts of the object world, but for folders and documents it is almost never right. Yes, if all your links are correct, that won't happen, but users don't always have links correct. Furthermore, the "infinite recursion" problem can easily happen when search engines follow self-referential links. It's possible to work around the problems by using "aq_explicit" and "absolute_url", but those strategies are cumbersome as they represent Zope-specific tailoring. Acquisition isn't limited just to implicit acquisition, though. Has anyone put any thought or work into creating an ObjectManager and Folder that allowed explicit, controlled or filtered acquisition? * ExplicitAcquisitionFolders would act as "limits" or "stops" that isolate different zope application trees from each other. * Controlled or filtered acquisition folders could have a property that declares which methods would be acquired, much like "import" statements in python. Either option would let developers choose, understand, and limit what they were acquiring from outside the local context. I think both document- and object-like Zope sites would benefit. Choice of mechanism is good. I've looked into the required changes some, but the ObjectManager and Folder classes know about each other in a way that doesn't seem completely straightforward to an outsider. I don't think I know enough to write the new classes, especially without a wholesale copy of the existing classes. To those in the know, how hard would it be to do, and what issues would be involved? Thanks. Michael Halle mhalle(a)media.mit.edu

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