- Zope-Dev - Zope lists

PANIC -- ZODB.POSException.ConflictError
by Tobias Herp 14 Nov '02

14 Nov '02

Hi, in a customer zope we get this error when creating a certain object type: >> Site Error An error was encountered while publishing this resource. ZODB.POSException.ConflictError Sorry, a site error occurred. Traceback (innermost last): File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 127, in publish File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 127, in publish File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 127, in publish File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 122, in publish File /data/opt/Zope-2.5.0-linux2-x86/lib/python/Zope/__init__.py, line 125, in zpublisher_exception_hook File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 102, in publish File /data/opt/Zope-2.5.0-linux2-x86/lib/python/Zope/__init__.py, line 172, in commit File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZODB/Transaction.py, line 233, in commit File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZODB/Connection.py, line 347, in commit (Info: (('*7jHQwOeBv1U9UVwVDj033w==', 'kcCompany'), ' \x00\x00\x00\x00\x00\x01I.', '')) File /data/opt/Zope-2.5.0-linux2-x86/lib/python/ZODB/FileStorage.py, line 635, in store (Object: /opt/zope/var/Data.fs) ConflictError: ('\x00\x00\x00\x00\x00\x00\x00\x00', ' \x03H\x9f+\x8b\x19\xf5w') << Data.fs was 'fsrecover'ed just yesterday; a new run didn't change anything. fstest.py doesn't display anything either. The error is reproducable in a VMWare session (SuSE 8.1), with nobody but me trying to access. Any ideas? tia, Tobias -- (sorry for any unfriendly footer added automatically against my wishes... please ignore it!) Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das un- erlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden.

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SSL Server integrated to Zope
by Hajime Nakagami 14 Nov '02

14 Nov '02

Hi! I try to hack SSL Server integreted to Zope. http://www.zope.org/Members/nakagami/zSSL #I wan't to use M2Crypto, Because It's difficult to me. I don't have enoght test, And I only tested on Cygwin. But I think zSSL good for several platform and some version (Probably 2.5 and later) of Zope. Please someone test that and send comment to me. PS. I have heard from a Linux Box user that when large page saved, zSSL came to stop. Is it blocking I/O ? race condition ?, please someone teachme.

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HTTP content negotiation-- has anyone tried this in Zope?
by Craeg Strong 13 Nov '02

13 Nov '02

Hello: I try to keep tabs on other open source CMSs, in particular Apache Cocoon, and I noticed this message: http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=103717736917834&w=2 talking about software that, in effect, enables one to configure a server to respond to the HTTP headers having to do with content negotiation: preferred charset, preferred language, and content-type. This is way cool stuff-- imagine an application capable of returning an XML representation of a resource instead of a human-readable XHTML simply based on the HTTP header-- same URL. ASIDE: This is in line with TBL's original vision of the web and is being adopted by high profile organizations like google-- it has supported Accept-Language for at least a year-- change the list of acceptable languages to demonstrate it in a browser... Question: has anyone tried to support this kind of thing using Zope yet? I imagine it should be possible, b/c you should have access to everything you need in the REQUEST object, right? If one agrees that this is a good idea, then wouldn't it be cool to have a set of ready-made components in Zope3 to facilitate switching on relevant HTTP headers-- either for mime type, I18N, etc.? Thoughts? --Craeg

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deadlock prevention for ZODB3 / Zope 2.6
by Jeremy Hylton 13 Nov '02

13 Nov '02

We recently discovered that ZODB3 applications, like Zope 2.6, can deadlock when run in a system that uses multiple storages. This was a fundamental design flaw in ZODB that, happily, has a simple fix. Brian and I are planning to commit these changes to the ZODB3 3.1 and Zope 2.6 release branches and make them part of an upcoming bug fix release. This is a slightly dodgy plan, because there is a lot of code that is being changed for this bug fix. But the problem is fairly serious and the solution is available now, we'd like to get it in the hands of users more quickly than ZODB 3.2 and Zope 2.7. In short, the solution is to sort storages before beginning the two-phase commit process used by the transaction manager. Since the two-phase commit occurs during a transaction commit, we know all the storages that will be used, and, thus, all the locks that will be acquired. By sorting the locks, we can guarantee that deadlock will not occur. The implementation of deadlock prevention requires changes to the storage and transaction data manager APIs. Each must now implement a sortKey() method that returns a string that can be used to sort the storages. The sortKey must be globally unique; two storages can't have the same key unless they are the same storage and one storage must have the same key regardless of when it is used. The sortKey must be a string, because other objects may not sort in the same order for all Python versions. We have provided default implementions of sortKey() for BaseStorage and Connection. These implementations aren't necessarily correct, but they will prevent outright breakage if you update to the maintenance release. BaseStorage uses the __name__ and Connection uses id(). All storages and data managers should be updated to the new API. The default implementations may not prevent deadlock in a multi-storage environment; they only prevent the update from breaking existing code. Jeremy

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Strange bug (NOT a Zope bug!) when exporting Zope objects on Windows with Norton Personal Firewall running ...
by Joachim Werner 13 Nov '02

13 Nov '02

Hi! Sorry for the corrupted mail. I just hit some button by accident and the mail was gone ... Here is the full text: I just encountered a very strange bug: One of our clients had problems with exporting and importing his stuff from his local machine to our servers. What happened was that lines like <meta name="keywords" content="<dtml-var keywords>"> became <meta name="keywords" content=><dtml-var keywords>"> and <img src="<dtml-var imageUrl>"> became <img src=><dtml-var imageUrl>">, which of course broke the HTML (I know that one could use the dtml entity syntax instead, but that's not the point here). We didn't have a clue why that would happen and suspected some incompatibility with character sets involved (He was on Windows with Zope 2.5.1 and we had Linux and Zope 2.6.0). But the solution was that as soon as the client had deactivated his Norton Personal Firewall and Norton Antivirus, everything was o.k. again! So this is NOT a Zope bug, but maybe it helps to know about the problem. The Firewall or Antivirus software (we think it is the Firewall) seem to parse the code (regardless whether you do a zexp or xml export) and replace characters ... The funny thing is that this seems to happen even if the Zope server runs locally! Cheers Joachim _______________________________ Joachim Werner iuveno AG Wittelsbacherstraße 23b 90475 Nürnberg Tel. +49 (0) 911 / 988398-4 Fax +49 (0) 911 / 988398-5 Mail: joachim.werner(a)iuveno.de WWW: http://www.iuveno.de

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Strange bug (NOT a Zope bug!) when exporting Zope objects on Windows with Norton Personal Firewall running ...
by Joachim Werner 13 Nov '02

13 Nov '02

Hi! I just encountered a very strange bug: One of our clients had problems with exporting and importing his stuff from his local machine to our servers. What happened was that lines like <meta name="keywords" content="<dtml-var keywords>"> became <meta name="keywords" content=><dtml-var keywords>"> and _______________________________ Joachim Werner iuveno AG Wittelsbacherstraße 23b 90475 Nürnberg Tel. +49 (0) 911 / 988398-4 Fax +49 (0) 911 / 988398-5 Mail: joachim.werner(a)iuveno.de WWW: http://www.iuveno.de

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access of non html documents
by General Info 13 Nov '02

13 Nov '02

i have the following situation. i want the users to be able to download non html documents if that document is refered to from an html document. however, i dont want the users to be able to type the url and document name on the url box of their browers and be able to download it. for example: the documents exist in http://www.wwwdotcom.com/nonhtmldocs/doc1.pdf however, i dont want the users to type that url on their browser and access doc1.pdf i only want them to access it if that particular document is linked from an html document. i have seen some websites that do that w/ images. how can i do that on zope? is it possible? i would appreciate any comments/suggesstions. -roberto

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ZODB 3.2 release plan posted
by Jeremy Hylton 12 Nov '02

12 Nov '02

I have posted a tenative release plan for ZODB 3.2 in the ZODB Wiki at http://www.zope.org/Wikis/ZODB/ZODB%203.2%20Release There are a small set of proposed features centering around better configuration and management of ZEO and ZODB. Feedback is welcome. Jeremy

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Proposed Additional reStructuredText Deliverables
by Jeffrey P Shell 12 Nov '02

12 Nov '02

With Andreas plugging away at reStructuredText Integration into Zope, I'm thinking of some extra deliverables. I'm not sure how deep we want to put ReST support in at the moment, considering that while the spec is pretty solid the codebase is still a moving target, but I would like to add and help work on the following proposed deliverables to the project: 1. reStructuredText support in the Zope Help System. 2. reStructuredText support for Product README handling. 3. Ensuring that Page Templates and Python Scripts can access the reStructuredText.HTML() function. #1 looks like it would require adding a ReSTHelpTopic class in the HelpSys package which could probably mimic (or even sublass) the HelpSys.HelpTopic.STXTopic class. Then support would have to be added into ``ProductContext.registerHelp()`` to map certain file suffixes to the ReSTHelpTopic ('.rst', etc). #2 could probably be handled the same way (look for a 'README.rst' file), but may be served better if the contents of the README.txt could be introspected enough to detect format. :\ #3 is easy, I just want to make sure it's not forgotten. We just have to decide the right one way to do it: expose it in 'Products.PythonScripts.standard' where all of the other DTML formatters are exposed, or out of its own namespace (ie: tal:content="structure python:modules['reStructuredText'].HTML(foo)"). Or both ways. -- Jeffrey P Shell jeffrey(a)cuemedia.com

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user roles & authentication
by Grant K Rauscher 11 Nov '02

11 Nov '02

recently I noticed that methods for retrieving user roles are affected by the URL from which the user logged in using basic authentication (as opposed to the location of the user account). I don't see any authentication-related cookies at all from ZOPE, session or otherwise, just basic http authorization. the problem is this: if one authenticates at a location deeper than their user account, authorization should apply up to the level of the account. it does - any method requiring authorization is allowed to run between the point of login and the user account - but when I test with *any* of these routines between the point of login and the user account it shows only 'Anonymous' - not the expected roles. user.getRoles() _.SecurityGetUser().getRoles() user.has_role( roleName ) visiting /manage or any other objects which require authorization works between the user account and the point of login - in fact, after rendering an object which would prompt for authorization if the only role were *really* Anonymous the roles for that object and ones it contains are fixed and show the expected results with getRoles() and has_role(). this problem occurred with ZOPE 2.5.0 or 2.5.1, and IE 5.5 or NN 7.0 Grant K Rauscher GeeKieR Enterprises http://www.geekier.com/

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