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setPermissionDefault not working???
by Sidnei da Silva 11 Mar '02

11 Mar '02

Hello everyone, Im writing to this list cause i talked with Andreas Jung and it told me to do so. Im having a problem with the method setPermissionDefault, as stated on issue 275 of the Zope collector, http://collector.zope.org/Zope/275, and Andreas told me that he was too busy to take a look at that, so im wondering if anyone is free to take this issue and solve it ASAP. The problem is that setPermissionDefault, when used from a simple Folder based python product is not working at all. There is a sample class attached to the collector issue which i have tested and confirmed not to work. thanx. []'s -- Sidnei da Silva X3ng Web Technology sidnei(a)x3ng.com.br

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Transaction Bugs
by kapil thangavelu 11 Mar '02

11 Mar '02

I wrote some unittests to investigate some odd transaction behavior i noticed while doing unittests of integrating non sub transaction aware objects, and to insure proper txn behavior. these tests test the transaction system independent of the rest of the zodb and test failure modes as well. i've found a few bugs. 1. TM.py ignores calls to tpc_abort. this i believe is the likely cause of most of the rdbms integration problems that are referenced above as TM.py generally forms the integration point between db adapters and zope's transaction framework. if an error occurs in the two-phase-commit protocol, the database adapter will never recieve a finish/commit or abort message, and will therefore (due to how TM works) never be able to register again for a zope transaction. 2. A Non Sub Transaction aware object (including any TM derived object) that participates in a sub-transaction will recieve a tpc_finish message (which for TM derivatives calls _finish) as part of the subtransaction commit process. this means that if the outer transaction is latter aborted, there will be a loss data integrity. 3. As part of the commit process for a transaction involving subtransactions, any objects registered since the last subtransaction commit will be involved in an implicit subtransaction commit. if an error occurs during this implicit subtransaction, none of the objects registered previously to the last explicit subtransaction commit will recieve any messages. i'm not sure totally sure this is a bug since any calls to explicitly begin a new transaction should abort the objects that haven't recieved any transaction messages. in a zope setting this is done automatically, however standalone users should be aware of this. i've posted a modified TM.py to my zope.org member page that contains fixes/workarounds for problems 1 and 2. http://www.zope.org/Members/k_vertigo/ShortStories/Transaction/ in addition the unittests i've been using are posted there as well. i'll commit these changes to TM.py latter today, but have posted the above to zope.org for those who don't want to immediately upgrade. actual fixes for problems 2 and 3 i'll leave to ZC. if you're using a rdbms with zope, i would recommend installing the modified TM.py in replace of the exiting TM.py at lib/python/Shared/DC/ZRDB/TM.py. i would appreciate any feedback from rdbms users who were previously experiencing problems. if this does not solve your problem, and you believe its the fault of the transaction system, please email me. i don't use an rdbms with zope, but i'm happy to further investigate. cheers kapil thangavelu

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Unauthorized users can writelock helpfiles in /Control_Panel/Products
by Ivo van der Wijk 11 Mar '02

11 Mar '02

Hi, I'm sorry to repost my question here, but noone seems to be able to give me any information on the standard Zope mailinlist. I still do, however, find the problem described below annoying, and it could be even considered a security bug (somewhat), or at least a Help page DOS :) -- Hi all, We run Freezope.org, a site where people can get their own folder with Manager/Owner access. Of course, users should not be able to mess up things outside their own folder. However, they can. The problem seems to be with the helpfiles included with the installed products. For some reason, these are sometimes/always changed (as in: writable, modified) when accessed. This often gives us (harmless?) log entries such as: 2002-03-06T03:48:56 INFO(0) Z2 CONFLICT Competing writes at, /HelpSys/menu Traceback (innermost last): File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: menu) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: menu) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/Shared/DC/Scripts/Bindings.py, line 324, in __call__ (Object: menu) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/Shared/DC/Scripts/Bindings.py, line 354, in _bindAndExec (Object: menu) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/App/special_dtml.py, line 244, in _exec (Object: menu) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/TreeDisplay/TreeTag.py, line 159, in render (Object: a tree tag) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/TreeDisplay/TreeTag.py, line 269, in tpRender (Object: HelpSys) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/TreeDisplay/TreeTag.py, line 523, in tpRenderTABLE (Object: HelpSys) (Info: (['Tm9uZQ==', []], {'childless_decoration': '', 'id': 'tpId', 'branches': 'tpValues', 'url': 'tpURL'}, (['Tm9uZQ==', []],), (['Tm9uZQ==', []],))) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/TreeDisplay/TreeTag.py, line 323, in tpRenderTABLE File /usr/local/zope/Zope-2.4.4b1-src/lib/python/HelpSys/HelpSys.py, line 228, in tpValues File /usr/local/zope/Zope-2.4.4b1-src/lib/python/HelpSys/HelpSys.py, line 331, in tpValues (Object: Help) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZODB/Connection.py, line 535, in setstate ConflictError: ("'\\x00\\x00\\x00\\x00\\x00\\x0f{\\xee'", '<extension class HelpSys.HelpTopic.STXTopic at 85934e8>') --- end of trace --- However, if one of the freezope users creates a version, starts working in this version, and then consults any of the help pages for the installed products, this page will be write-locked, and unaccessible for all other users. When accessing the helppages, the following error appears: Zope Error Zope has encountered an error while publishing this resource. Error Type: VersionLockError Error Value: ("'\\x00\\x00\\x00\\x00\\x00\\x10&r'", '/ZopeHosting/freezope/ivotest.freezope.org/myversion') Troubleshooting Suggestions * 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/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/zope/Zope-2.4.4b1-src/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook (Object: Config.stx) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZPublisher/Publish.py, line 175, in publish File /usr/local/zope/Zope-2.4.4b1-src/lib/python/Zope/__init__.py, line 240, in commit File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZODB/Transaction.py, line 302, in commit File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZODB/Connection.py, line 420, in commit (Info: (('HelpSys.HelpTopic', 'STXTopic'), '\x00\x00\x00\x00\x00\x10&r', '')) File /usr/local/zope/Zope-2.4.4b1-src/lib/python/ZODB/FileStorage.py, line 658, in store (Object: /usr/local/zope/zopesites/freezope/var/Data.fs) VersionLockError: (see above) --- end of trace --- Could this be considered a bug? Why is this happening at all? With regards, Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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Re: [Zope-dev] Usage of try: .. except: .. in zope
by Ivo van der Wijk 11 Mar '02

11 Mar '02

On Sun, Mar 10, 2002 at 05:40:58PM -0500, Craeg K. Strong wrote: > Sorry, I am not answering your question.... > > but I was curious about your product. Have you thought about > restricting Folder contents based on type? That could be extremely > interesting. > It is also something that is on the list to be potentially incorporated > into Zope 2.6 > I definately have, that is, I'm considering filtering allowed metatypes. It won't be in my first release however. Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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The future of ZPatterns and LoginManager
by Johan Carlsson [Torped] 11 Mar '02

11 Mar '02

Hi everybody, (I did ask this question to the ZPatterns list, but without any answer. So I hope one better luck here.) I finally got the opportunity to use ZPatterns in a project and am quite please with the result (after the mandatory wrestling :) Anyway, I would like to use both ZPatterns again, as well as LoginManager, but I feel somewhat of a doubt what they will be around in the future and in Zope 3. So, are they? Or what I really want to know, is it safe to base my applications on ZP and/or LM or is it something I'm going to regret? Best Regards, Johan Carlsson torped strategi och kommunikation ab johan carlsson johanc(a)torped.se birkagatan 9 113 36 stockholm västmannagatan 67 http://www.torped.se http://easypublisher.torped.se

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ZODB thread safety issue.
by Romain Slootmaekers 11 Mar '02

11 Mar '02

Yo, I read on the doc's : """ A key feature of Zope 2 (ZODB 3) is that (a copy of) a persistent object is never accessed by more than one thread (unless the programmer goes way out of thier way). Each thread uses it's own database connection(s). Each connection has it's own copies of persistent objects. This feature provides a major simplification for application developers. """ This explains the problems we have with our system: we have a multithreaded system where each thread iteratese over a set of objects in the ZODB, and sees of something needs to be done... if so the thread does it. Now since each thread gets its own version of the object. our actions occur multiple times... This is not the desired behaviour. Is there a way we can share the access to the objects, or do we have to create a global lock ? And if we have to create a global lock, what's the desired/standard approach in doing so. TIA, Sloot.

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RFC : AnyScripts
by Jerome Alet 10 Mar '02

10 Mar '02

Hi, I'm finally toying, after having stalled a too long time, with the creation of ZShellScripts, which would be for ZShell commands what PythonScripts are for Python... The current, not yet available, incarnation is very highly based on PythonScripts, however I wondered if something better couldn't be done, because it seems to me to be an unneeded repetition of most of the PythonScripts' code : AnyScripts AnyScripts would have a mandatory first line similar to the one of any Unix shell script. By unix shell script I mean any script which can be launched directly under Unix, not only bash or csh scripts, but also perl, tcl, etc... So an AnyScript would contain a first line like : #! /scripts/interpreter And the execution of this script in the context on which it is applied would be delegated to another object present in the path which was set on this very first line, i.e. /scripts/interpreter So you could put any interpreter object of your choice in for example the /scripts folder (no path would mean search the interpreter object within the acquisition path) For example PythonScripts would contain something like : #! /builtins/python or something like that. Out of my mind I can already think of a ZShell interpreter object, but why not other types of interpreter objects : perl tcl C (the language ! Why not after all) etc... Each interpreter object would have at least two methods : compile() => returns a code object from source code, if meaningful (otherwise returns the source unchanged), to be stored in the AnyScript object which calls the compile() method. execute() => executes the above code object. This method of the Interpreter object would be called by the AnyScript object at run time, passing it the code object obtained with compile() Of course all of this come straight out of my mind, and there would probably be some problems I'm not able to understand yet... Bound variables would be like for PythonScripts, with the exception of their content would be the best format for the Interpreter in question, so each Interpreter object would probably also have a bind() method which would bind vars in the preferred format for the AnyScript object which calls this method, and would be accessible using the preferred syntax of the langage in question, e.g. : for PythonScripts, vars like context would be Zope Objects, like they currently are. for ZShell AnyScripts, vars like context, would be paths to Zope Objects, and accessible with names like $context for example. for C AnyScripts, vars would probably be something like PyObjects pointers. etc... So AnyScripts objects would interact with their interpreter object of choice to compile their source code, bind their vars, then finally execute the code and get the result back. What do you all think about this idea ? Are any of you interested ? I admit I don't know anything about the feasability of such a project with other languages than ZShell, however if a single implementation could be done, then anyone could add his own interpreter later... PS : I'll do ZShellScripts anyway... bye, Jerome Alet

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Error removing NT Service
by Dean＠work (E-mail) 10 Mar '02

10 Mar '02

Hi I have an application built with Zope which can install, control and remove NT services. The actual code is in an external python script. The services can be installed and controlled but if you try and remove the service it get marked as 'disabled' and can not be reinstalled or remove manually (without using the registry). However if Zope is restarted the service is then removed. Does anyone have any ideas about resolving this problem ?? thanks in advance Dean Houghton

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Usage of try: .. except: .. in zope
by Ivo van der Wijk 10 Mar '02

10 Mar '02

Hi All, I'm currently implementing a QuotaFolder for Zope, i.e. a Folder that restricts the number of objects, their sizes and their total size (and in the future: the installabe meta types). Things look very promising (if anyone feels like testing, please mail me), but it took me quite a while to fix one bug: When creating a ZopeTutorial in a QuotaFolder, I always got Error Type: Bad Request Error Value: The id "examples" is invalid--it is already in use. I couldn't really figure out why my QuotaFolder would cause ZopeTutorial to be installed (or actually imported) twice. Until I studied its code: In addTutorial in TutorialTopic.py, there's the following piece of importing code: # work around old Zope bug in importing try: folder.manage_importObject(tutorialExamplesFile) except: folder._p_jar=self.Destination()._p_jar folder.manage_importObject(tutorialExamplesFile) Basically, anything can go wrong in the first manage_importObject (and in my case it was the raising of a QuotaExceeded exception), causing the code to try to import the file *again* Isn't there a better/cleaner way to do this? It this Exception-type-less try/except construct used elsewhere in Zope (I think I've seen it before)? Should I put a request in the collector? Cheers, Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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SQL compare to form value -HELP-
by Sean Kelley 10 Mar '02

10 Mar '02

I am trying to test whether or not 3 SQL fields are equal to a form field. I am doing this within an SQL method. (I am trying to learn zope and Mysql at the sam time) How does one do this? Here is where I am going with this so far: I have these listed as arguments: Breeds Breed1 Breed2 Breed3 SELECT * from Ranch WHERE Breeds = <dtml-sqltest name="Breed1" type="string"> OR Breeds = <dtml-sqltest name="Breed2" type="string"> or Breeds = <dtml-sqltest name="Breed3" type="string"> Breeds is the name of the form input and I want to test and see if it equals any one of the 3 fields Breed1, Breed2, or Breed3 and return all of the row if there is a match. -- Sean

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