January 2002 - Zope-Dev

OracleStorage Used in a Production Environment
by Eric Roby 30 Jan '02

30 Jan '02

Is anyone successfully using OracleStorage in a production system or (better yet) as a storage server in a ZEO configuration ? It doesn't appear that any work has been done on it for nearly 18 months. Will OracleStorage work with the DCOracle2 product in support of 9i ? Thanks in advance Eric

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Why is discussion only available in certain modes with CMF 1.2
by John_Knutson＠candle.com 30 Jan '02

30 Jan '02

Using CMF 1.2, I get different behaviour for the same object depending on how I come by it: Following the route from the Home button, when I navigate to a document, the document is opened automatically, e.g. with Word or Powerpoint Coming from Folder Contents or Search, I am first of all placed into View mode (the URL has /view appended automatically) and I get the chance to 'Reply'. I have tried this with a Manager, a Member and an Anonymous user and the behaviour doesn't change. News on the other hand, works the same regardless of how I find it. How do I impose common behaviour for files, regardless of the route? John Knutson Candle Corp England

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Defining Interfaces
by Steve Alexander 30 Jan '02

30 Jan '02

Hi folks, When I define an Interface, are the methods of the interface supposed to have "self" as the first argument? It certainly seems that way from ./lib/python/AccessControl/IUserFolder.py in Zope2. It also seems that way from the Interface Interface. However, many of the interfaces in Zope3 omit the "self" argument. -- Steve Alexander

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Exception in XML-RPC handling doesn't rollback?
by Brad Clements 30 Jan '02

30 Jan '02

I'm using a thunked_tm da (interbase, gvibDA) on Zope 2.5beta3 RH Linux 7.1 I'm handling an xml-rpc request in a PythonScript. If an exception is raised in the script after some operations have been performed on the DB, it seems that the xml-rpc exception handler does not rollback() pending transactions. In non-xmlrpc processing this works correctly, that is zodb and database transactions are rolled back by the exception handling code. I've looked at the xmlrpc code in ZPublisher, but can't quite figure out where the rollback handling should be in comparison to the regular http publisher. Can anyone suggest where I start looking so I can verify the behaviour I'm seeing and submit a patch? Brad Clements, bkc(a)murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax netmeeting: ils://ils.murkworks.com AOL-IM: BKClements

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Zope on Linux and Database as MS-SQL Server on WinNT
by Peeyush Garg 30 Jan '02

30 Jan '02

Hi, What's the current best solution to utilize the combination of Zope on Linux and Database as MS-SQL Server running on WinNT. I don't find much information searching the Zope web site. Can somebody point me to some link? Thanks, Peeyush.

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Re: [Zope-dev] Error 11
by Ahsan Imam 29 Jan '02

29 Jan '02

Did this restarting problem start with Zope 2.4.x? Was is there in 2.3.x because were are thinking of downgrading to 2.3.x? Thanks for your help >>> Chris McDonough <chrism(a)zope.com> 01/28/02 21:26 PM >>> Hmm. This doesn't look any better. ;-) I'm not sure how to tell you to get more relevant information from gdb. Ahsan Imam wrote: > Our site is so heavily dependent on the mysql connection that it would > lose majority of the functionality. > > I added the -Z"''" option and here is the command > ps axww | grep z2 looks like: > > /usr/bin/python /usr/local/zope/z2.py -z /usr/local/zope -a > zslave2.newtimes.com -Z '' -t 7 -w 8080 -p - -f - -m - -F 8889 -l > /usr/local/zslave2/var/zope.log > > gdb #0 0x4008c8a5 in __sigsuspend (set=0x415cefbc) at > ../sysdeps/unix/sysv/linux/sigsuspend.c:45 > 45 ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or > directory. > in ../sysdeps/unix/sysv/linux/sigsuspend.c > > > > > > > > > > >>>>Chris McDonough <chrism(a)zope.com> 01/28/02 16:45 PM >>> >>>> > You have a core file from the "zdaemon" process.. it's sorta useless as > a result. If you want to get a meaningful core file, run Zope without > ZDaemon (pass "-Z ''" to the start script). > > That said, we've confirmed "crashbug" problems in an installation with > mysqlda in at least one customer site. Can you make this problem happen > > without mysqlda? > > Ahsan Imam wrote: > > >>Applied the db.py patch and no success. >>Currently dowloaded and >>installed the Zope 2.4.4 beta 1 >> >>Python Version >>python 2.1.2 >> >>ZMySQLDA >> >>Here is a little excerpt from gdb >>Would the following output have any special meaning? >> >>gdb python core >> >>#0 0x4008c8a5 in __sigsuspend (set=0x415cf19c) at >>../sysdeps/unix/sysv/linux/sigsuspend.c:45 >>45 ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or >>directory. >> in ../sysdeps/unix/sysv/linux/sigsuspend.c >> >> >> >> >

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Re: Python Base Classes, ZObjectManager, and Subobjects
by Ross Patterson 29 Jan '02

29 Jan '02

Nobody's really answering and I keep getting both closer and further looking at the ZClasses code. As I understand it now, ZClasses.ZClass.createZClassForBase is supposed to address the ZClass "meta class" issues such as creating the _zclass_ in addition to the actual class and handling propertysheets. So I would assume that my error lies somewhere in there, but I can't figure it out. A few more notes, when I create a ZClass that subclasses my python base class which in turn subclasses ZClasses.ObjectManager.ZObjectManager, it creates a ZClass with a default "View" for "Subobjects". This seems to indicate that somewhere the subobjects propertysheet is being treated as an instance propertysheet rather than a propertysheet of the ZClass meta class. Also, when I create an instance from such a ZClass, trying to access the instance in the ZMI yields an authorization error. Following is the traceback: Traceback (innermost last): File /usr/Zope/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /usr/Zope/lib/python/ZPublisher/Publish.py, line 114, in publish File /usr/Zope/lib/python/Zope/__init__.py, line 158, in zpublisher_exception_hook (Object: blah1) File /usr/Zope/lib/python/ZPublisher/Publish.py, line 98, in publish File /usr/Zope/lib/python/ZPublisher/mapply.py, line 88, in mapply (Object: manage_workspace) File /usr/Zope/lib/python/ZPublisher/Publish.py, line 39, in call_object (Object: manage_workspace) File /usr/Zope/lib/python/App/Management.py, line 76, in manage_workspace (Object: blah1) Unauthorized: (see above) I would assume this happens because the propertysheets/subobjects/manage method listed in the view tab is not valid for the instance, but trying to call that method on the ZClass directly returns: Traceback (innermost last): File /usr/Zope/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /usr/Zope/lib/python/ZPublisher/Publish.py, line 114, in publish File /usr/Zope/lib/python/Zope/__init__.py, line 158, in zpublisher_exception_hook File /usr/Zope/lib/python/ZPublisher/Publish.py, line 89, in publish File /usr/Zope/lib/python/ZPublisher/BaseRequest.py, line 278, in traverse File /usr/Zope/lib/python/OFS/PropertySheets.py, line 601, in __bobo_traverse__ AttributeError: subobjects I have also tried the two variations in the quoted message below. Then I tried the two variations below except substituting ZClasses.ObjectManager.ZObjectManager for ZClasses.ObjectManager.ObjectManager. All with the same results Again, my goal is to be able create a ZClass that subclasses a python base class that in turn subclasses ZClasses.ObjectManager.ZObjectManager in such a way that the final ZClass and any other ZClasses that subclass it have a subobjects tab in the management view of the ZClass. Thanks. On Sun, 27 Jan 2002, Ross Patterson wrote: > I'm transitioning a product from pure ZClasses to a hybrid product python base > classes and ZClasses. So this is my first time working with python > products. > > I'm trying to setup a python base class to provide a central place to > subclass ZObjectManager and CatalogAware that I can rebase later > without the ZClass hassle. But when I try to create a ZClass in the > product and subclass to one of my python base classes, I don't get the > subobjects tab in my ZClass. > > Clearly I'm missing somthing basic here, but I have scoured the docs > and mailing lists for a clue before coming here. BTW, I did find this > post earlier that no one seemed to reply to, and below that are my > actual python files. > > ---quoted message--- > > I want to create a Python base class that inherits from the > ObjectManager and has the "Subobjects" tab in the ZClass management > screen. Inheriting from OFS.ObjectManager.ObjectManager does not do > this - I need to inherit from ZClasses.ObjectManager.ObjectManager. > > I still don't know how to have the Subobjects propertysheet thing > work. I've tried the two ways I listed in my last email of doing > this, but I can't get it to work. > > One way was: > > class MyObjectManager(ZClasses.ObjectManager.ObjectManager): > " .... " > > class ZMyObjectManager: > """Mix-in for Object Management > """ > > _zclass_=myObjectManager > > propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() > > manage_options=( > {'label': 'Subobjects', 'action' > :'propertysheets/subobjects/manage'}, > ) > > and then register ZMyObjectManager as a base class in __init__.py. > The other way was: > > class MyObjectManager(ZClasses.ObjectManager.ObjectManager): > propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() > > manage_options=( > {'label': 'Subobjects', 'action' > :'propertysheets/subobjects/manage'}, > ) > > and register that as the base class. Neither of them work. > > -- > Itamar S.T. itamars(a)ibm.net > > ---end quoted message--- #!/usr/bin/python # Products/ZCapitalProjects/__init__.py from ZClasses import createZClassForBase from PartBases import PartBases from PartBase import PartBase from SitePartBase import SitePartBase from ProjectPartBase import ProjectPartBase from PartBases import ZZCPObjectManager, ZCPObjectManager2, ZZCPObjectManager3, ZCPObjectManager4 createZClassForBase( PartBases, globals(), 'ZCPPartBases' ) createZClassForBase( PartBase, globals(), 'ZCPPartBase' ) createZClassForBase( SitePartBase, globals(), 'ZCPSitePartBase' ) createZClassForBase( ProjectPartBase, globals(), 'ZCPProjectPartBase' ) createZClassForBase( ZZCPObjectManager, globals(), 'ZZCPObjectManager' ) createZClassForBase( ZCPObjectManager2, globals(), 'ZCPObjectManager2' ) createZClassForBase( ZZCPObjectManager3, globals(), 'ZZCPObjectManager3' ) createZClassForBase( ZCPObjectManager4, globals(), 'ZCPObjectManager4' ) #!/usr/bin/python # Products/ZCapitalProjects/PartBases.py import ZClasses from ZClasses.ObjectManager import ZObjectManager from Products.ZCatalog.CatalogAwareness import CatalogAware class PartBases ( ZObjectManager ) : # CatalogAware, """ Base Classes for all ZCP Parts """ pass class ZCPObjectManager(ZClasses.ObjectManager.ObjectManager): " .... " class ZZCPObjectManager: """Mix-in for Object Management """ _zclass_=ZCPObjectManager propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() manage_options=( {'label': 'Subobjects', 'action':'propertysheets/subobjects/manage'},) class ZCPObjectManager2(ZClasses.ObjectManager.ObjectManager): propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() manage_options=( {'label': 'Subobjects', 'action' :'propertysheets/subobjects/manage'},) class ZCPObjectManager3(ZClasses.ObjectManager.ZObjectManager): " .... " class ZZCPObjectManager3: """Mix-in for Object Management """ _zclass_=ZCPObjectManager3 propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() manage_options=( {'label': 'Subobjects', 'action':'propertysheets/subobjects/manage'},) class ZCPObjectManager4(ZClasses.ObjectManager.ZObjectManager): propertysheets=ZClasses.ObjectManager.ZObjectManagerPropertySheets() manage_options=( {'label': 'Subobjects', 'action' :'propertysheets/subobjects/manage'},) #!/usr/bin/python # Products/ZCapitalProjects/PartBase.py from PartBases import PartBases class PartBase ( PartBases ) : """ Base Class for ZCP Parts """ pass #!/usr/bin/python # Products/ZCapitalProjects/SitePartBases.py from PartBases import PartBases class SitePartBase ( PartBases ) : """ Base Class for ZCP Site Parts """ pass #!/usr/bin/python # Products/ZCapitalProjects/ProjectPartBases.py from PartBases import PartBases class ProjectPartBase ( PartBases ) : """ Base Class for ZCP Project Parts """ pass

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persistent threads ?
by Romain Slootmaekers 29 Jan '02

29 Jan '02

Yo, We have some computational expensive task that we execute as a result of some HTTPRequest. So we spawn a thread and return immediately. Future requests can get the status and thus we can monitor progress at the client side. So far so good. But what should we do when the server restarts before the task finishes ? Onfortunately, pickling the thread and restarting it is not an option (Threads are not picklable (pickleable, pickable ??? ah well what's in a name) :( ) So what are our options here ? Should we turn to Stackless python as a vm or what ? TIA, Sloot

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[Fwd: [Zope3-dev] Re: Zope 3 learning curve?]
by Chris Withers 29 Jan '02

29 Jan '02

Don't think I was the _only_ intended recipient for this ;-) cheers, Chris Lennart Regebro wrote: > > From: "Chris Withers" <chrisw(a)nipltd.com> > > Lennart Regebro wrote: > > > > I think there is no doubt that Zope 3 will have a higher learner > threshold > > > than Zope 2. After all, you can just compare the Zope 3 tutorial with > the > > > BoringProduct explanation. There will be more things to understand > before > > > you can make a complete product. > > > > If that _is_ true, then Zope 3 _will_ fail. > > Not at all. Even if it takes a day or two to create a product for Zope 3 > that is not a problem. That is just raising the initial learning step to > what any other environment has. > > From: "Hannu Krosing" <hannu(a)tm.ee> > > Does most VisualBasic developers _really_ understand VisualBasic ? > > Probably not. But actually, how long does it take to learn how to create a > product in visial basic? It sure isn't as fast as for Zope 2. > > Remember, i'm talking about the initial step here. Not how long it takes to > be *great* at it, but how long it takes before you can create a simple > product. > > Ken Manheimer <klm(a)zope.com> > > I think the Zope 3 tutorial gets you seriously acquainted with a > > significant portion of the Zope 3 architecture, as well as its use, and i > > don't have the impression that the BoringProduct explanation equips you > > near as well to understand the Zope 2 architecture. I may be wrong, > > though (i'm in transit, can't check right now). > > Thats absolutely true, but at the same time, you do need to have some hum of > the things the Zope3 tutorial teaches to be able to create a product. You > need to know what an interface is, and you need to understand what you must > have in the XML description and so on. > > > Still, i believe that > > many people find Zope 2 more difficult than it could be, and that Zope 3 > > as a system is *much* more comprehensible than Zope 2 - more regular and > > clean - and that will make all the difference in the world. > > I agree 100%. If the initial step is 2 hours or two days doesn't make much > difference. Only computer journalists demand that you should be able to get > started in no time. Everybody else understands the need for understanding > before you can do something serious.

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Re: [Zope-dev] [BUG] Python 2.1.2 & Zope 2.4.1
by Anthony Baxter 29 Jan '02

29 Jan '02

>>> "Olivier Deckmyn" wrote > assertion "STACK_LEVEL() <= f->f_stacksize" failed: file "Python/ceval.c", > line 687 This is a new assertion, put in to catch the case where the RestrictedCompiler code used by PythonScripts incorrectly calculates stack size. > After some hours of researches, I have a (dirty, really) fix : > I had to modify Python sources and hack line 687 in ceval.c : I removed > it... This is _not_ a fix, any more than putting in a signal handler for SIGSEGV that ignored it and kept going would be a "fix" for a segfault bug. The bug is _real_ and causes memory corruption. The most likely result is that Zope will crash mysteriously, some time later down the track, but it's also possible you'll end up with random data corruption. This is _far_ worse than just a crash. If upgrading to 2.5 or 2.4.4-to-be is not an issue, just replace the lib/python/RestrictedPython package in your Zope installation and reboot. Please, please, please, don't propagate dodgy and incorrect fixes like the above (removing the assertion). The assertion is in the code for a very, very good reason. Anthony

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