January 2005 - Zope - Zope lists

TM and commit/abort regarding RDBMS
by Marco Bizzarri 13 Jan '05

13 Jan '05

Hi all. Thanks to suggestions provided by Dieter on this mailing list, we've been successfull in creating transaction-aware objects, which correctly register. My next question is where I could find more information about the protocol used by Zope/ZODB with TM-aware classes. I think it is a two phase commit, but, in this case, I've some doubt. The two phase commit, IIRC, works as follows: phase 1) all the involved parties in a transaction are asked if the transaction should commit or abort phase 2) if all the parties agrees on commit, then commit (i.e. call the commit for) all objects, otherwise abort. Now, if I understand correctly, phase 1) is done in the tpc_vote. According to the implementation of some DA (ZMysqlDA, ZPsycopgDA), the tpc_vote is actually not defined, therefore it will always vote for finalizing. At this point, all transactions will try to commit... including the open database transaction. The question are two: 1) where can I learn more about this process inside Zope? 2) is there a scenario where a commit from Zope will face an abort from the RDB (i.e. Zope will call the commit, and the RDB will refuse due to concurrency problems) ? Thanks to all for patience and support. Regards Marco

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create user from script
by mgagnon1＠gmu.edu 13 Jan '05

13 Jan '05

Is it possible to create / edit objects from within a python script? What I really want to do is have a form which will allow users to create new users. Thanks! -- Mike G

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ZSQL and python script performance
by Sion Morris 13 Jan '05

13 Jan '05

Hi, In an attempt to speed up an application I came across a bottle neck with Python Scripts in Zope. Using apache's 'ab' utility I tested a simple query (sql_course_components) directly with the following URL: ab -n 20 -c 4 'http://myserver/portal_skins/acs/sql_course_components/manage_test?gcom_id= 19030&term_code=200405&SUBMIT=Submit+Query' ----- Requests per second: 23.22 [#/sec] (mean) Using a Python Script (ptest) to return the result from the query is much slower: return context.sql_course_components(gcom_id=19030, term_code=200405) ab -n 20 -c 4 'http://myserver/portal_skins/acs/ptest' ----- Requests per second: 2.59 [#/sec] (mean) I tried the same test with an external method with similar results. Why is there such a big difference between accessing the ZSQL query directly and using a python script (which is needed to process the query in the real application) to return the query? TIA, Sion

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Copy of open-box product
by Vital Lobachevsky 13 Jan '05

13 Jan '05

Is it possible to create a copy of open-box product in /Control_Panel/Products? It fails with error: Error Type: Duplicate Class Ids Error Value: None Zope 2.5.1 (binary release, python 2.1, linux2-x86), python 2.1.3, linux2 TIA, -- -tick

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Locking objects
by Jeff Rodriguez 13 Jan '05

13 Jan '05

I need to lock an object to perform thread/ZEO safe operation on one of it's attributes. How can I go about doing this? -- Jeffrey Alan Rodriguez Jeffrey.Rodriguez(a)gmail.com

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Zope site missing
by John Poltorak 13 Jan '05

13 Jan '05

I was working on a Plone site a week or two ago, but after restarting Zope it is no longer there. Is there any way to tell what has happened? Is there any way I can report on the contents of Data.fs? It hasn't been touched since I last updated it. -- John

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[ANN] mxm Proxy Tool 1.0
by Max M 13 Jan '05

13 Jan '05

mxm Proxy Tool The mxmProxyTool is a Zope tool that fetches content from an external web source. The content can then be inserted in a page template or dtml page on your own site. Generally speaking, it makes it possible to browse another website, inside the look and feel of your own. It is thought of as a quick and dirty way to integrate external websites with a Zope site. More info here: http://www.mxm.dk/products/public/mxmProxyTool/ -- hilsen/regards Max M, Denmark http://www.mxm.dk/ IT's Mad Science

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Zope Bible.
by Fernando Lujan 12 Jan '05

12 Jan '05

Hi, Does this book worth a try? Thanks. Fernando Lujan

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changing the LDAP server address of an LDAPUserFolder
by Sion Morris 12 Jan '05

12 Jan '05

A question about changing the LDAP server address of an LDAPUserFolder: The address of our LDAP server has changed from ldap.mydomain.com to ldap3.mydomain.com. To accommodate the changes I tried the following: Adding ldap3.mydomain.com LDAP Server under the configure tab and then deleting the previous ldap.mydomain.com nearly works except users with locally stored roles no longer can access the site. Is it possible to change the LDAP server setting and retain the users with locally stored roles? Or do I need to make a record of the users with locally stored roles and add them again? Zope 2.7.2 Python 2.3.4 LDAPUserFolder 2.4 Regards, Sion

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Why am I getting "AttributeError: 'NoneType' object has no attribute 'setHeader'"?
by Sensible Chaos 12 Jan '05

12 Jan '05

Running 2.7.4rc1, I'm getting the following errors in relation to a product I'm building, and can't seem to figure out why. It appears to me that the dtml method is not getting a RESPONSE object, but I've no idea what could cause that. Any help would be GREATLY appreciated, as I'm very new to zope and really can't seem to figure this out. Thanks! Patrick ============ Errors: Site Error An error was encountered while publishing this resource. AttributeError Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 175, in publish_module_standard * Module ZPublisher.Publish, line 132, in publish * Module Zope.App.startup, line 204, in zpublisher_exception_hook * Module ZPublisher.Publish, line 101, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 39, in call_object * Module Shared.DC.Scripts.Bindings, line 306, in __call__ * Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec * Module App.special_dtml, line 175, in _exec * Module Shared.DC.Scripts.Bindings, line 320, in __render_with_namespace__ * Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec * Module App.special_dtml, line 175, in _exec * Module DocumentTemplate.DT_Util, line 198, in eval __traceback_info__: RESPONSE * Module <string>, line 0, in ? AttributeError: 'NoneType' object has no attribute 'setHeader' (Also, an error occurred while attempting to render the standard error message.) ========== Relevant Python Code: security.declareProtected('View management screens', 'manage_main') manage_main = DTMLFile("dtml/mainAnnounceIt", globals()) ========== DTML Page (dtml/mainAnnounceIt) <dtml-var manage_page_header> <dtml-var manage_tabs> <form method=post action=editAnnounceIt> <table border=0 cellspacing=0 cellpadding=5> <tr> <td>Title:</td> <td><input type=text name="title" value="&dtml-title;"></td> </tr> <tr> <td colspan=2><input type=submit value="Edit Annoucements"></td> </tr> </table> </form> </body> </html> <dtml-var manage_page_footer>

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