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

29 Jan '02

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 >>> "Matthew T. Kromer" <matt(a)zope.com> 01/25/02 15:13 PM >>> Ahsan Imam wrote: >Setting the variable did not help. >I downloaded and built Python 2.1.2 yesterday. > >Products: >zope-tinytable-0.8.2-2 >zope-zmysqlda-2.0.7-5 > >>>>"Chris McDonough" <chrism(a)zope.com> 01/24/02 12:22 PM >>> >>>> >Sigh. Can you try to start Zope with the environment variable >ZOPE_SECURITY_POLICY=PYTHON set to see if the problem continues? > >Are you using any database adapters or other C extensions? > >Are you sure that Zope is using the Python 2.1.2 that you installed? > Try applying this patch to db.py in ZMySQLDA. It makes it so MySQLDA database connections reopen themselves when the DA object migrates between threads.

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Zope 2.5.0 and VirtualHostMonster
by Jesus Cea Avion 28 Jan '02

28 Jan '02

If you have problems with VirtualHostMonster and Zope 2.5.0, check http://collector.zope.org/ColDev/64 -- Jesus Cea Avion _/_/ _/_/_/ _/_/_/ jcea(a)argo.es http://www.argo.es/~jcea/ _/_/ _/_/ _/_/ _/_/ _/_/ _/_/ _/_/ _/_/_/_/_/ PGP Key Available at KeyServ _/_/ _/_/ _/_/ _/_/ _/_/ "Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/ "My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/ "El amor es poner tu felicidad en la felicidad de otro" - Leibniz

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Python 2.1.2 causes Error code 6?
by Chris Withers 28 Jan '02

28 Jan '02

Hi, A routine move to Python 2.1.2 this morning has resulted in one of our Zope instances continually dying with the following: zdaemon: Mon Jan 28 13:45:45 2002: Aiieee! 18724 exited with error code: 6 Some questions: 1. What does Error Code 6 mean? 2. How can I find out what these error codes eman in general? 3. How can I fix this problem? cheers, Chris PS: Zope 2.4.2 ZEO 1.0b4 No DA's or other non-standard C-based extensions.

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Re: [Zope-dev] [BUG] Python 2.1.2 & Zope 2.4.1
by Olivier Deckmyn 28 Jan '02

28 Jan '02

> This has been explained recently (--> mailing list archives, probably > through Google search for "f_stacksize"). I did, without a great success. > > Summary, you need to upgrade Zope, too! If only I could... You can't make your customer migrate their Zope version in 2hours. Our servers are hosting dozens of website for dozens of customer. Moving to a newer Zope is not just a matter of installing a new version... For example, we have a CMF site that will only work with Zope 2.4.1. We tried to migrate to CMF 1.2 or Zope 2.4.3, without success (crashes, security machinery misteries, etc.). CMF is still too dark to manipulate it as we would wish. > > Viele Grüße > Dieter

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Python Base Classes, ZObjectManager, and Subobjects (fwd)
by Ross Patterson 28 Jan '02

28 Jan '02

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. >From the quoted message I can see that I need to do something with the _zclass_, propertysheets, and manage_options of my base class. Is this documented anywhere. I just gave up on reading the code. ---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 # __init__.py from ZClasses import createZClassForBase from PartBase import PartBase from SitePartBase import SitePartBase from ProjectPartBase import ProjectPartBase def initialize( context ) : createZClassForBase( PartBase, globals(), 'ZCPPartBase' ) createZClassForBase( SitePartBase, globals(), 'ZCPSitePartBase' ) createZClassForBase( ProjectPartBase, globals(), 'ZCPProjectPartBase' ) #!/usr/bin/python # PartBases.py from ZClasses.ObjectManager import ZObjectManager from Products.ZCatalog.CatalogAwareness import CatalogAware class PartBases ( CatalogAware, ZObjectManager ) : """ Base Classes for all ZCP Parts """ #!/usr/bin/python # PartBase.py from PartBases import PartBases class PartBase ( PartBases ) : """ Base Class for ZCP Parts """ #!/usr/bin/python # Products/ZCapitalProjects/SitePartBases.py from PartBases import PartBases class SitePartBase ( PartBases ) : """ Base Class for ZCP Site Parts """ #!/usr/bin/python # Products/ZCapitalProjects/ProjectPartBases.py from PartBases import PartBases class ProjectPartBase ( PartBases ) : """ Base Class for ZCP Project Parts """ ----------------------------------------------------------------- | Ross Patterson rossp(a)cats.ucsc.edu | | Programmer/Analyst (831)459-2792 | | Physical Planning & Construction Fax:(831)423-7436 | | UC Santa Cruz http:www2.ucsc.edu/ppc | -----------------------------------------------------------------

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[BUG] Python 2.1.2 & Zope 2.4.1
by Olivier Deckmyn 28 Jan '02

28 Jan '02

Hi, I decided to upgrade my Python 2.1.1 to Python 2.1.2 (in order to gently move to 2.5 later). My Zope instances were working quite fine....but...randomly I got a core dump (!) and the following message in logs : assertion "STACK_LEVEL() <= f->f_stacksize" failed: file "Python/ceval.c", line 687 Bug seems to appear when playing with ZCatalog (CMF sites could'nt even render a page) and Python scripts ? 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... Then recompile and it seems to work. I know this is dirty, and my Zope my crash later. PLEASE CHECK and HELP ! This looks like a major serious bug to me. Cheers, Olivier.

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DTML Document textarea edit
by Dirk Datzert 28 Jan '02

28 Jan '02

Hi! I want to suggest a modification for the DTML Document/Method dtml-file documentEdit.dtml On default the textarea will be displayd with wrap="off" . If I imported XML-Files without line breaks it is difficult to edit the files via DTML-Webfrontend. A property wrapmode could solve this: documentEdit.dtml: <textarea name="data:text" wrap="<dtml-if wrapmode><dtml-var wrapmode><dtml-else> off</dtml-if>" style="width: 100%;"<dtml-if dtpref_cols> cols="<dtml-var dtpref_cols>"<dtml-else > cols="50"</dtml-if><dtml-if dtpref_rows> rows="<dtml-var dtpref_rows>"<dtml-else> rows="20"</dtml-if>><dtml-var __str__></textarea> Regards, Dirk

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