December 1999 - Zope-Dev

Tree tag bug
by Jason Spisak 29 Dec '99

29 Dec '99

The code below causes the tree tag to throws the following exception when a subitem is expanded. Traceback (innermost last): File /Zope/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /Zope/lib/python/ZPublisher/Publish.py, line 179, in publish File /Zope/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: CatalogAware) File /Zope/lib/python/ZPublisher/Publish.py, line 165, in publish File /Zope/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: left) File /Zope/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: left) File /Zope/lib/python/OFS/DTMLMethod.py, line 145, in __call__ (Object: left) File /Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: left) File /Zope/lib/python/DocumentTemplate/DT_In.py, line 691, in renderwob (Object: submissions) File /Zope/lib/python/TreeDisplay/TreeTag.py, line 154, in render (Object: a tree tag) File /Zope/lib/python/TreeDisplay/TreeTag.py, line 226, in tpRender (Object: CatalogAware) File /Zope/lib/python/TreeDisplay/TreeTag.py, line 543, in apply_diff (Info: ([None, (['AAAAAAAOXaM=', []],)], ['AAAAAAAObfc='])) AttributeError: (see above) If I reload the page however, it shows up fine with the item expanded. When I collapse, it throws the exception again. If I reload, the collapsed tree renders as it should. Sounds like a bug. Here's the code: <dtml-in tokens> <dtml-call "REQUEST.set('token',_[_['sequence-item']])"> <dtml-tree expr="token" branches_expr="objectValues(['Folder', 'DTML Method', 'DTML Document'])"> <a href="<dtml-var tree-item-url>" target="_parent"> <img src="<dtml-var icon>" border="0"><font size="-1"> <dtml-var title_or_id></font></a> </dtml-tree> <br> </dtml-in> The tokens property contains a list of id's of a few objects that are one folder above the document that contains the tree tag. Can anyone duplicate/explain this behavior? All my best, -- Jason Spisak webmaster(a)hiretechs.com

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feedback wanted on ZCatalog changes...
by Anthony Baxter 29 Dec '99

29 Dec '99

At <URL:http://www.zope.org/Members/anthony/patches/index_html> I've placed a number of changes/patches for ZCatalog. As well as a couple of bug fixes (which are in the collector) there's a new feature - I've added a new management tab 'Query'. from the above page: A new management tab 'Query', which allows you to query the contents of the ZCatalog. When building complex applications with ZCatalog (see my 'dtml-tree from zcatalog' howto), you end up writing a lot of tiny DTML methods just to dump out the results of a particular query. This makes it a lot easier. Note that this is pretty shiny and new, and I'd really like some feedback on this. There's two search methods - one takes an index and a search term, and will return matching objects (and optionally display all metadata in a table), while the other will take an index and do a uniqueValuesFor() on it to return a list of index values. Clicking on a result in this form will return matching objects for that value (as in the first method) Note that this will only work for indexes of type FieldIndex and KeyWordIndex. To detect TextIndexes, I had to check for the presence of a method called 'positions' in the index, since that's only present in TextIndex. There appears to be no way to find out the type of an index apart from diving into Python and examining it's __class__. Should this be fixed? Anyway, if people could have a look at this, and let me know their thoughts, it would be appreciated... Anthony

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pcgi-wrapper spins when client (zope) dies
by Ava 29 Dec '99

29 Dec '99

Hello, this is on Zope-2.1.1, with IIS When Zope dies through a request made with PCGI (such as when I shutdown the Zope process or restart it), pcgi-wrapper 'spins' (it consume all system resources, the system become unusable, and I can't even kill pcgi-wrapper - I had to reboot the computer), apparently waiting for Zope to release something. Here is what I read in pcgi-wrapper.c on line 893: /* Travel beyond this point requires calling the ReleaseMutex function. Fortunately, the Win32 mutex is automatically released when a process terminates, but we could still encounter a situation where the process is hung or stalled ... */ Am I in the "situation where the process is hung or stalled" ? Or is there a "magic" way to solve my problem. Please help. I have planned to go production next week but with that problem, I can't! Regards, Jephte CLAIN

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slm
by Rana Gocer 29 Dec '99

29 Dec '99

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RE: [Zope-dev] Re: Subpath traversal interface (was RE: ANN: Pyth on Methods 0.1.7 up and over to DC) and over to DC)
by Michel Pelletier 28 Dec '99

28 Dec '99

> -----Original Message----- > From: Evan Simpson [mailto:evan@4-am.com] > Sent: Monday, December 20, 1999 7:34 PM > To: Michel Pelletier > Cc: 'Phillip J. Eby'; zope-dev(a)zope.org > Subject: Re: [Zope-dev] Re: Subpath traversal interface (was RE: ANN: > Python Methods 0.1.7 up and over to DC) and over to DC) > > > Michel Pelletier wrote: > > > I, personally, prefer the folderish approach. If a site root is a > > definitive folder, then 'portal' like methods can be placed in it, > > I'm not sure I understand what 'portal' methods are. Are we > talking about > methods which, for example, should only be used in a > SiteObject, and not in > an ordinary folder? Or are they something else? I guess they're shaping up to be top level methods of a portal object. What methods get to be 'portal methods' is still not a concrete concept. > That's pretty nifty. I believe we want that, what we need > to figure out > > is the best way to do manipulations like that. You're using a Rule > > object now, probably makes sense at the application level > to not change > > that and have identical Rule objects in interface, but > investigate how > > it's to be done. If there is a discrete folder object like > we have now, > > is the before hook needed at Rule time? > > Well, yes, unless you add Rule-aware machinery to the > standard Folder class > (or ObjectManager?). I'd hate to have to replace a Folder with a > RuleFolder (or whatever) just because I wanted a Rule in it. > Note that > there isn't technically such a thing as a Rule object (in the > sense of a > distinct class). Any DTML Method or Document, External > Method, or Python > Method can be a Rule. Also, a Rule can manipulate the > traversal path more > simply than a __bobo_traverse__ could, since it only concerns > itself with > Ids, not actual objects. I think what we are going to end up doing is releasing a small, general purpose object to do the virtualhosting. It will be a mixin class that hooks __b_t__ and absolute_url(). As a 'Product' we will be developing a simple object based on Folder and this new class, SiteObject. Further, the SiteObject class will be used for our 'PortalObjects'. So, you can use the stock object which is simple, folderish; or you can use the portal object which will be more complex, or you can roll your own by inheriting SiteObject and whatever, ZClass or Python, etc. Now the path manipulation thing sounds like it should be some seperate genetic material that is subclassable and realizable by a simple 'Rule' object. I think that this object's elaboration, while related to the genetic material that forms virtualhosting, should be developed without mixing them together too much. Sorta the same thing we did with Virtual hosting, we folded your functionality into the core; it might be useful to fold path manipulation logic into the core and realize it the same way, subclassable, simple object (not, I would imagine, unlike your Rule object) a snip of genetic material that can be mixed in at any time. I suspect I'm beginning to see your side of the argument, A 'Rule' mixin would conflict with the SiteObject mixin if they both wanted to hook __b_t__, so your __before__ hook was a way to chain calls like this? -Michel

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Authentication with IIS --> Zope through REMOTE_USER: at last!
by Ava 28 Dec '99

28 Dec '99

[my english is broken, but you may read the entire message anyway. it is very interesting] Hello, I asked some days ago how to make IIS handle authentication and pass the information back to Zope through REMOTE_USER. Rob Page said that if IIS doesn't pass REMOTE_USER, I could write an ISAPI filter to stuff the value in the request. He's right: it is easy to do (I wrote the filter in 10mn !) *but* I then realized that IIS in fact passes REMOTE_USER.... *after* the authentication process. here is how it works in challenge/response authentication mode: - if the cgi program (for instance, Zope through pcgi-wrapper) says 401 Unauthorized *OR* the NT user (including the anonymous user set in IIS) has not the read/execute permission on the ressource, neither the current user (identified with the challenge/response protocol) has the proper rights, the browser triggers the 'identify yourself sucker' dialog box. - the chat is beetween the browser and IIS for the moment, and the browser keep asking for a username and a password until IIS realize that the user identified by the browser has the read/execute permission on the ressource. - *then* it calls the cgi program with either AUTH_USER or LOGON_USER environment variable set (it is still unclear what variable is set and when. I have to test for both for the authentication process to work) - if the cgi program is happy with AUTH_USER/LOGON_USER, IIS calls it with REMOTE_USER variable set. it sounds very odd, because the cgi seems to be called only once, but it works that way: I patched lib/python/AccessControl/User.py to test for AUTH_USER and LOGON_USER in remote user mode, and it works now in remote user mode: ------------------------------8<------------------------------ --- User.py.orig Wed Nov 03 05:33:10 1999 +++ User.py Tue Dec 28 07:03:26 1999 @@ -432,6 +432,10 @@ e=request.environ if e.has_key('REMOTE_USER'): name=e['REMOTE_USER'] + elif e.has_key('AUTH_USER'): + name=e['AUTH_USER'] + elif e.has_key('LOGON_USER'): + name=e['LOGON_USER'] else: for ob in self.getUsers(): domains=ob.getDomains() ------------------------------8<------------------------------ Once this patch has been applied, there's another trick to do: NT users are written that way: ServerComputerName\UserName *so* your access file must be something like: NTServer\superuser: where superuser is a user created on NTServer (a PDC or a standalone server) and the user you create in the user folder *must* be in the Server\UserName format. And voila! IIS handles authentication and passes it back to Zope. You favorite user folder must support remote user mode though. I plan to review NTUserFolder and if it doesn't support remote user mode, I want to integrate the feature in it. That way, I don't even need to manually add user to any user folder! Please send any comment to minf7(a)educ.univ-reunion.fr This document may turn into an howto, once I get sufficient time Regards, Jephte CLAIN

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RE: [Zope-dev] re: Open Source design competition
by gvwilson＠nevex.com 27 Dec '99

27 Dec '99

> Why replace everything? Attempting to replace the likes of autoconf > isn't the best way to promote Open Source. My main interest isn't to promote Open Source, but to make better software engineering practices more accessible by making basic tools easier to use. I think Open Source will promote itself along the way by showing that it can meet the needs of other groups. > With this same mindset, what about a change-control system to replace > CVS? Too ambitious for a first round, and we'd like to see what BitKeeper (www.bitkeeper.com) delivers. > A better approach might be a modular development environment 1. Too ambitious. 2. Hard for potential users to migrate incrementally. 3. Inter-operability will be a big theme in the second round of the design competition. By the time that's done, we may know enough to think about tackling a full-blown development environment. (My instinct is that if we were to try this now, whatever we produced wouldn't be any more of an improvement over existing tools than they are over the Xerox Smalltalk environment of the early 1980s.) > The real question is: what does the Open Source community benefit from > YAGNUR? (Yet-Another-GNU-Replacement) Actually, no --- this project's real question is "Can the Open Source community deliver tools that are usable by non-hardcore programmers?" If the answer is 'yes', then those tools will also make software development easier for the hard core. As Alan Cooper said: The phrase "computer literate user" really means the person has been hurt so many times that the scar tissue is thick enough so he no longer feels the pain. -- Alan Cooper, "The Inmates are Running the Asylum" Greg

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re: Open Source design competition
by gvwilson＠nevex.com 25 Dec '99

25 Dec '99

Hi, everyone. I got word last Saturday that the U.S. Department of Energy is giving me an $860,000 grant to produce a new generation of Open Source software engineering tools in Python. The project's long-term objective is to encourage scientists and engineers to treat programs in the same way as they do other experiments, i.e. to calibrate, test, peer review, and so on. My feeling is that if we can make good practice accessible to scientists and engineers, we'll also have made it more accessible to professional programmers, computer science students, and everyone else. To kick-start things, we're going to be holding a two-round design competition. Anyone (individual or team, professional or student) can submit a short entry for the first round; the judges will pick four candidates to go forward in each of four categories, and those individuals or teams will be asked to submit full entries. The four categories are: * an issue tracking system to replace Gnats and Bugzilla; * a build system to replace make; * a platform inspection and configuration system to replace autoconf; and * a testing framework to replace XUnit, Expect, and DejaGnu. The official announcement of the project's start will be on January 14. By that time, I'd like to have a Zope-based web site for the project up and running, capable of handling FAQs, discussions, mailing lists, submissions, check-ins, and everything else. I'm looking for volunteers to help set it up, since I'm going to have to work flat out to write the content. I think it will be great publicity for Zope, and the site will of course include links to the home pages of its creators and maintainers. If you're interested in helping out, please contact 'gvwilson(a)nevex.com', and include a link to a Zope-based site that you've already built. I look forward to seeing you at IPC8 in January, Greg p.s. while I would be grateful if you could let people know about the project, I'd also be grateful if you wouldn't broadcast the news before the web site comes up on January 14.

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unique rec id for Gadfly?
by Sin Hang Kin 25 Dec '99

25 Dec '99

Dear Zope-masters, How do I generate a unique record id for a newly inserted record for Gadfly? I have the following code: <dtml-call "manage_changeProperties(last_rid=last_rid + 1)"> <dtml-let rid=last_rid> <dtml-call insert_new_record> </dtml-let> where last_rid is a property defined in the folder. However, rid does not get into the zsql method. BTW, how do I test if the insert operation success? Rgs, Kent Sin

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mod_pcgi2 version 0.1.0
by Oleg Broytmann 24 Dec '99

24 Dec '99

Hello! http://www.zope.org/Members/phd/mod_pcgi2 mod_pcgi2 version 0.1.0 - Apache module for Zope/PCGI. Implemented per-directory config merge functions. I've run a lot of tests, mostly using Apache's ab benchmark utility. I work with Zope management interface using the module, so I think it is stable enough and mostly bug-free. I'd be glad to hear any opinion, or count any user of the module. Oleg. ---- Oleg Broytmann Foundation for Effective Policies phd(a)phd.russ.ru Programmers don't die, they just GOSUB without RETURN.

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