March 2002 - Zope-Dev

the segfault saga continues
by Leonardo Rochael Almeida 08 Mar '02

08 Mar '02

So now I have installed a brand new MySQL-python-2.9.2a2 explicitly compiled against reentrant mysql libraries (libmysqlclient_r, in Debian's libmysqlclient10-dev package). I also installed ZMySQLDA-2.0.9b1 which compounds MySQL-python reentrancy by serializing all mysql requests with a lock. We've also completely reformed the site so as to get rid of that huge number of pythonscripts (they were mostly duplicates and we manage to remove the redundancy using ZClasses). Segfaults are still with me, however, unless I disable the cycle-gc, of course. Tomorrow I'll try and get a core to see what gdb can tell me. Anything you guys suggest I take a look at? (besides the C stack trace which will probably be pointing somewhere inside the GC) I'll also try go get the remaining non recompiled python scripts fixed, so as to please Anthony Baxter :-) But for that I'll need one of these: * a way to make the 'needs recompiling' log message give me the path to the object. Since that message happens at __setstate__, getPhysicalPath() doesn't return anything useful (no acquisition wrappers). * a way to know whether a Python script needs recompiling or not. So that I can ZCatalog only the non recompiled python scripts. I tried asking the ZCatalog for all the python scripts and later recompiling them, but I managed to miss a lot of them somehow. It's as if the ZCatalog decided that it wasn't going to really catalog ALL python scripts. -- Ideas don't stay in some minds very long because they don't like solitary confinement.

2 2

RE: [Zope-dev] Manual object-to-relational persistency framework
by Bjorn Stabell 08 Mar '02

08 Mar '02

I think the Storage interface wroks at a lower level, dealing with pickled Python objects. I'd like to do it at a higher level, so I can define my own object-relational mapping, unique for each object type I want to use the Zope framework (acquisition, access control, automatic persistence) and still have the objects stored in a nice domain specific relational schema, not storing anything (even "ghost" objects) in the ZODB, but having "live" objects available as usual. Ideally, it should be possible to get the the data for the objects from anywhere. I guess it would be possible to make a special Storage interface that calls hooks in objects that have them to actually implement the storage/persistency functionality, but that seems kind of overkill and it'd mean I have to mount another Storage etc. There must be any easier way? -----Original Message----- From: t.foerster(a)biologie.hu-berlin.de [mailto:t.foerster@biologie.hu-berlin.de] Posted At: Friday, March 08, 2002 17:27 Posted To: Zope Developer Conversation: [Zope-dev] Manual object-to-relational persistency framework Subject: Re: [Zope-dev] Manual object-to-relational persistency framework On Friday, 8. March 2002 09:50, Bjorn Stabell wrote: > I'm trying to use Zope without storing everything in ZODB while still > having the perception of an object-oriented database. I want to > control the object-to-relational mapping layer, but would like the > loading and saving of objects to be automatic. Is there some way to > do that using Zope? > Where would I, e.g., hook into to get automatic > loading/cacheing/saving of objects that weren't stored in ZODB, and > where I could actually create the methods to load/save objects myself > (I want to control the data structure). Sounds like changing the (default) backend of the ZODB. That way you use Zope with the ZODB but your objects are stored in a RDBMS too. ZODB comes with several backends (a.k.a Storages), the default FileStorage, DemoStorage, OracleStorage. The latter doing already object relational mapping to Oracle RDBMS. If you want to control the mapping, just define your own Storage (I do not know how hard it is, maybe the 'gurus' do?) and then tweak your Zope instance to use your custom Storage instead of the default FileStorage. That way you do not have to care about automatic loading/saving of your objects. Regards, Thomas -- Webmaster Innovationskolleg Theoretische Biologie http://itb.biologie.hu-berlin.de _______________________________________________ Zope-Dev maillist - Zope-Dev(a)zope.org http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )

2 1

WebDAV locks disappearing...
by Jerome Alet 07 Mar '02

07 Mar '02

Hi, I've just tested webDAV access for the very first time using cadaver, so maybe this is a known problem. I've locked some objects using cadaver's lock command, and then opened a browser keeping cadaver's connection opened. then I've searched for this locks using the ZMI and also a method of my own. All worked fine, the locks were found. Then some time later I've retried to find the locks, and both the ZMI and my method returned no lock. However in cadaver the locks still seemed to be there... Then I've unlocked the objects and relocked them in cadaver and retried, this time the locks were found again... I hadn't the time to do some more testing but I find this surprising. Does anyone have seen the same problem ? FYI Zope 2.5.0 + Python 2.1.2 both up-to-date Debian Woody packages. bye, Jerome Alet

3 4

multiple database connections
by Jerome Alet 07 Mar '02

07 Mar '02

Hi, First I have to say I've not tried what is discussed below, I'm just thinking about how this could be done... Say I have several relationnal databases, both have an identical structure. Since these databases are identical, all my ZSQL methods can be used with any of them. So I plan to architecture my Folder tree like that : Level0 | +-- ZSQLMethod1 +-- ZSQLMethod2 +-- ... +-- Level1-1 | | | +-- DAConnection | +-- ... some stuf specific to this database ... | +-- Level1-2 | +-- DAConnection +-- ... some stuff specific to this database ... Each DAConnection connects to a different database, but the id is identical in order for the ZSQL methods to find it in whichever folder they are called. Now the problem is : one can't create a ZSQL method if there's no DAConnection at the same level or above. I suppose that creating all my ZSQL methods in for example Level1-1, then cutting&pasting them in Level0 could work, but I find this very counter intuitive. And if this would work, then the ZSQL methods wouldn't be editable anymore since at Level0 there's no DA... So my question is : why the hell can't developpers create ZSQL methods as they see fit, and be allowed to type-in the name of a possibly not-yet-existing Database Connection ? After all, creating ZSQL methods isn't for end users, so maybe Zope could trust developpers in knowing exactly what they want to do... Adding a free text field and allowing a "Free" entry in the drop-down list in the ZSQL method creation form would help. The Test tab form could also be modified to allow the developper to choose any DA at test time. Any comment or a solution to do this the right way ? thanks in advance. Jerome Alet - alet(a)unice.fr - http://cortex.unice.fr/~jerome Fac de Medecine de Nice http://wwwmed.unice.fr Tel: (+33) 4 93 37 76 30 Fax: (+33) 4 93 53 15 15 28 Avenue de Valombrose - 06107 NICE Cedex 2 - FRANCE

3 3

Re: [Zope-dev] Zope 2.6 planning - call for contributors!
by Mario Valente 07 Mar '02

07 Mar '02

Hi: I think that the possibility of having "inactive" objects, objects that are instantied, exist in the ZODB and in the folder tree but are invisibile to the Zope machinery (acquisition, rendering, itemizing) by setting/unsettting a property flag would also be something of extreme usefulness. C U! -- Mario Valente

1 0

Join the Zope team
by Brian Lloyd 07 Mar '02

07 Mar '02

Hi all, Zope Corp. is looking to add a Project Manager / Technical Lead to our team. You can find a full description of the position here: http://www.zope.com/Corporate/CareerOpportunities/ The position is roughly 50 / 50 engineering and project management. In addition to planning and executing customer engagements, you will be working with team members and management to develop and deliver high quality solutions. The ideal candidate will have: - Deep technical knowledge of Zope / CMF and Python, and experience building high-quality production systems with these tools - Experience managing software projects for internal and external customers - Strong planning, requirements anaysis and documentation skills - Experience managing the full lifecycle of a software project from inception to delivery and support If you are interested in working with us, please send your resume and salary requirements in .pdf format to careers(a)zope.com. Brian Lloyd brian(a)zope.com Software Engineer 540.361.1716 Zope Corporation http://www.zope.com

1 0

ZPT: how to access property sheet of custom ZClass
by David Hart 07 Mar '02

07 Mar '02

Hi! I'm implementing a simple db, using the same methods in the JobBoard example. I looked at Kube, but I'd like something a bit more generic. I'm trying to make add/edit forms and display pages as simple as possible. Rather than have custom versions of all of these, each with copies of the same property names, I'd like to pull the property/attribute names from the property sheet of the ZClass in the Product I added. Something like: <span tal:repeat="props python:root.Control_Panel.Products.CEdb.cedb_record.propertysheets.common.record_default_properties.attrs()"> <p tal:content="props"></p> </span> The above example is probably very wrong for many reasons-- it shows my lack of experience with TAL, python and Zope innards in general -- but I think it conveys what I'm trying to do. I'm not sure if I can use "python:object.attrs()", or even if the objects under Control Panel are accessible to ZPT as the above example produces a guarded_getattr error. Also, is there a more generic or elegant way to refer to the record_default_properties object? Any help would be much appreciated! Regards, Dave

1 0

RE: [Zope-dev] Zope 2.6 and OrderedFolders
by sean.upton＠uniontrib.com 06 Mar '02

06 Mar '02

Is this a suggestion that TF go into the core? One other (major) problem with TF is that it breaks session tracking site-wide, or at least the ability to have more than one session id manager per Zope instance in CST; I'm not sure about sessions in Zope 2.5... TF seems to have too much normalcy-hijacking magic to go into the core, if you ask me... Sean -----Original Message----- From: Eric Roby [mailto:Eric.Roby@noaa.gov] Sent: Wednesday, March 06, 2002 10:56 AM To: zope-dev(a)zope.org Subject: [Zope-dev] Zope 2.6 and OrderedFolders I think OrderedFolders is a great product and should be in the core ... but does this also mean that TransparentFolder will get those parts (that Shane mentioned some time ago) optimized that kept it from making it into the core before?? If so ... sounds like a win-win situation. _______________________________________________ Zope-Dev maillist - Zope-Dev(a)zope.org http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )

3 2

recursion depth exceeded
by Terry Kerr 06 Mar '02

06 Mar '02

Hi, I am running a fairly high traffic Zope server where people occassionly ftp files in and out of the server. Approximately once per week, the zope process will go to using 99%CPU and stay like that untill it is restarted. The error shown in the stupid log file is: 2002-03-06T01:22:41 ERROR(200) ZServer uncaptured python exception, closing channel <zope_ftp_channel connected 202.129.84.50:64011 at 8ac4ecc> (exceptions.RuntimeError:maximum recursion depth exceeded [/usr/local/lib/python2.1/asyncore.py|poll|104] [/usr/local/lib/python2.1/asyncore.py|handle_write_event|393] [/usr/local/zope/Zope-2.4.3-src/ZServer/medusa/asynchat.py|handle_write|147] [/usr/local/zope/Zope-2.4.3-src/ZServer/medusa/asynchat.py|initiate_send|209] [/usr/local/zope/Zope-2.4.3-src/ZServer/medusa/asynchat.py|refill_buffer|190] [/usr/local/zope/Zope-2.4.3-src/ZServer/medusa/ftp_server.py|close|179] [/usr/local/zope/Zope-2.4.3-src/ZServer/medusa/ftp_server.py|close|903] [/usr/local/lib/python2.1/asyncore.py|close|355] [/usr/local/lib/python2.1/asyncore.py|del_channel|241] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] [/usr/local/lib/python2.1/asyncore.py|__getattr__|361] .... and so on... Line 361 in asyncore.py is: 358 # cheap inheritance, used to pass all other attribute 359 # references to the underlying socket object. 360 def __getattr__ (self, attr): 361 return getattr (self.socket, attr) It hints to me that it is some sort of ftp server error that is causing the problem. I have looked into it, but most of it is over my head and I was hoping somebody could help. I have tried to reproduce the error, but without success. The server is: FreeBSD4.3 Zope 2.4.3 (from src) python 2.1.2 terry -- Terry Kerr (terry(a)bizarsoftware.com.au) Chief Technical Officer Bizar Software Pty Ltd (www.bizarsoftware.com.au) +61 3 9530 9182

3 2

Zope 2.6 and OrderedFolders
by Eric Roby 06 Mar '02

06 Mar '02

I think OrderedFolders is a great product and should be in the core ... but does this also mean that TransparentFolder will get those parts (that Shane mentioned some time ago) optimized that kept it from making it into the core before?? If so ... sounds like a win-win situation.

1 0