September 2000 - Zope-Dev

CalendarTag, year mode image
by al028823＠alumail.uji.es 06 Sep '00

06 Sep '00

Hi all, I'd like to release the 0.9.21 version of the CalendarTag soon, but first I want to change the year mode image, currently it's an "Y" which is not very international, I'd like to see a language neutral image. The interface of the CalendarTag is based in the Palm Pilot, but the Palm III I've here lacks the year mode, I think the Palm VII has. Could somebody send me an international image for the CalendarTag year mode? Thanks in advance, david

1 0

Python 1.6, "Expected node type 12, got 312"
by John Hayward-Warburton (Programming account) 06 Sep '00

06 Sep '00

Hi, Clean build of Python 1.6 (downloaded immediately following release notification), clean build of Zope-2.2.1-src; Accessing /manage brings an error in gparse.py, line 293 (ast=sequence2ast) , "Expected node type 12, got 312". Anyone else seeing this? Anyone know what it means? Naturally, everything is just fine when built on Python 1.5.2. And Zope is marvellous. John Hayward-Warburton linux(a)billabong.demon.co.uk

2 1

Distribution Tab TTW Products
by Chris Withers 06 Sep '00

06 Sep '00

Tres Seaver wrote: > the distribution tab > products don't seem to work properly, at least not on all systems (I > tested before checking in on my RH 6.2 Linux box, where all was well; > on my NT box, a fresh checkout bombs out with a GPF!?) I noticed this too but I thought it was fixed in Zope 2.2.0? cheers, Chris

1 0

Call for a creation_datetime property!
by Jay, Dylan 06 Sep '00

06 Sep '00

It is really a painful thing to do without. I realize I can add this capability to factories of my own objects but I don't want to have to create my own versions of dtml-document and everything else just to ensure that a creation date is kept. I've tried using transaction logs but this is very dodgy for the following reasons. 1) An object can be created by many different methods. Its guess work working out which created the object. 2) The odb can be packed and then you've just lost your creation date. Can anyone give a good reason not to include this property as a standard for all ZODB objects? ---- Dylan Jay Tel: +61 2 9886-8961 Avaya Communication FAX: +61 2 9352 9224 Level 5, 15 Talavera Road Mobile:+61 409 606 171 Nth Ryde, NSW, 2113 ICQ: 520341 AUSTRALIA

3 2

SiteAccess 2 Questions
by Chris Withers 06 Sep '00

06 Sep '00

Hi, Here's a load of questions that have sprung up as a result of trying to get to grips with SiteAccess 2 on Zope 2.2.1: It looks like REQUEST.steps is the replacement for PARENTS? Is that so? Small grumble: REQUEST['TraversalRequestNameStack'] is a bit of a long-winded name :P > If an Access Rule is broken, and is preventing normal access, it can > be disabled by restarting Zope with > environment variable SUPPRESS_ACCESSRULE set. So now you have to restart Zope to undo a screwup? I guess __no_before_traverse__, or whatever it was, was a security whole, or something? Hmm, the example for Multiple Sites isn't very robust :-( http://www.zope.org/Members/4am/SiteAccess2/vhosting You use HTTP_HOST, without ensuring it exists. I remember having problems with this in Zope 2.1.6 as HTTP_HOST doesn't exist when you access things via FTP, so an error gets thrown, effectively preventing you from accessing any objects covered by the access rule through FTP. My solution for this is just to wrap the rule in <dtml-if "REQUEST.has_key('HTTP_HOST')"> Well, that's all for now... cheers, Chris

2 2

'import Zope' problem
by Christian Couder 06 Sep '00

06 Sep '00

Hi everybody, I am quite new to Zope and I want to use the Python debugger as described in the How-To: The Debugger Is Your Friend. I installed Zope with the Debian zope package version 2.1.6-5, so my zope directory is /usr/lib/zope (this is where I have a lib/python directory), but I have my 'access' file in /var/lib/zope. That's why when I am in /usr/lib/zope/lib/python and I start python and then I type "import Zope" I get a 'No access file found' error. Here is the transcript (1)bash://root@constance/var/lib/zope # cd /usr/lib/zope/lib/python /usr/lib/zope/lib/python (1)bash://root@constance/usr/lib/zope/lib/python # python Python 1.5.2 (#0, Apr 3 2000, 14:46:48) [GCC 2.95.2 20000313 (Debian GNU/Linux)] on linux2 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> import Zope Traceback (innermost last): File "<stdin>", line 1, in ? File "/usr/lib/zope/lib/python/Zope/__init__.py", line 95, in ? import Globals, OFS.Application, sys File "/usr/lib/zope/lib/python/OFS/Application.py", line 96, in ? from AccessControl.User import UserFolder File "/usr/lib/zope/lib/python/AccessControl/User.py", line 294, in ? raise 'InstallError', ( InstallError: No access file found at /usr/lib/zope - see INSTALL.txt >>> In /usr/lib/zope/lib/python/AccessControl/User.py the code look like this: _remote_user_mode=0 try: f=open('%s/access' % INSTANCE_HOME, 'r') except IOError: raise 'InstallError', ( 'No access file found at %s - see INSTALL.txt' % INSTANCE_HOME ) Is the Debian package wrong or is the User.py code wrong ? Can I just change INSTANCE_HOME with "/var/lib/zope" in the User.py code ? Does this bug prevent the debugger from working ? Thanks in advance for your help. -- Christian COUDER christian(a)alcove.fr Ingénieur Informatique Libre Alcôve - http://www.alcove.fr/

2 1

Folderish objects and multiple inheritance
by Andy McKay 05 Sep '00

05 Sep '00

Hi there, Ok so I have a class that has multiple inheritance. My main class (A) works fine, but I wanted to add in folderish properties. The problem is the order of multiple inheritance and viewing folder objects. When you view a folder from you call index_html and this gives a content list. By inheriting this way: class B(A, Folder): I have kept all my A methods. However viewing it does not produce the content list since its overwritten by A. Of course inheriting: class B(Folder, A): Does work for that, but breaks all my other methods. Solutions: Well I tried defining a tab - view_folder which was something along the line of: def view_folder(self, client=None, REQUEST={}): ''' doc string ''' return Folder(self, client, REQUEST) But get an attribute error on manage_tabs. Any ideas? Thanks. -- Andy McKay, Developer. ActiveState.

1 0

BTree folders: opinions?
by Steve Alexander 05 Sep '00

05 Sep '00

I've been reading the discussions on benchmarks of BTreeFolder verus standard ObjectManager dict based folders. I have a BTreeFolder w/ Customizer support that I'd like to include in the DataSkinAddons package for its next release. I'll probably release a LargeUI Folder w/ Customizer Support, that has the BTreeFolder UI anyway. However, I'm not sure whether to store the folder contents in a dict or a BTree. Are dictionaries or BTrees the way to go for folders with lots of sub-objects? Anyone tried any other benchmarks? I *suppose* it could even be configurable: How about this for an idea: * Management interface uses the standard Folder interface when the number of objects in the contents are less than a certain amount. With more objects, it switches to the BTree Folder UI. This number can be reconfigured as an attribute of the folder. * You can switch between using a dict and a BTree to store the sub-objects, on an instance-by-instance basis. The switch-over will be slow, but it will be easier than changing the base-class of existing instances. Comments? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

2 1

ZPatterns: transaction bug
by Steve Alexander 05 Sep '00

05 Sep '00

While updating a load of DataSkins all together using a ZCatalog, I got this error: ---- 2000-09-03T08:03:13 PANIC(300) ZODB A storage error occurred in the last phase of a two-phase commit. This shouldn't happen. The application may be in a hosed state, so transactions will not be allowed to commit until the site/storage is reset by a restart. Traceback (innermost last): File lib/python/ZODB/Transaction.py, line 296, in commit File lib/python/Products/ZPatterns/Transactions.py, line 108, in tpc_finish File lib/python/Products/ZPatterns/Transactions.py, line 137, in end_tran File lib/python/Products/ZPatterns/Transactions.py, line 48, in _unregister (Object: ProviderContainer) KeyError: _v_registered ---- The line from Transactions.py in question is: def _unregister(self): del self._v_registered >From a little bit of instrumentation, I see that one of my Customizer instances is getting unregistered twice in a row. An obvious naive fix is to put the del line in a try-except block, or to change it to if self._v_registered: del self._v_registered >From a lot of instrumenting code, tinkering and reading up on the ZODB transaction system, I think I've found what the problem is. The error happens when the ZCatalog attempts to commit a subtransaction.

3 3

Virtual Hosting in 2.2 - a Bestiary of Buglets
by Itamar Shtull-Trauring 05 Sep '00

05 Sep '00

I setup virtual hosting on Zope 2.2.1 with SiteAccess 2. I used Apache with ProxyPass (Apache acting as a reverse HTTP proxy in front of ZServer) instead of FastCGI, since this is much faster (with caching headers apache is about 10 times as fast as ZServer). The setup is as follow - each site has a folder in /websites, so www.example.com is mapped to /websites/example in Zope. In /websites/example I have an Access Rule that tells Zope that the base url is http://www.example.com. Problem 1: HTTP and HTTPS (more of a proxypass issue) ======================================================= I want to be able to serve both http and https versions of a site from Apache. Problem is, because of the way proxying works, there is no way for Zope to know if it is origially being accessed via http or https. My solution? Add a folder in top level of Zope called "ssl". If we see our path as proxied by Apache is /ssl/websites/example, we know we are being accessed via SSL. Because of the magic of acquisition, this works, but it's still an ugly hack, and slows things down. Here's the SiteAccess rule I used: if REQUEST['PATH_INFO'][:5] == '/ssl/': REQUEST.setVirtualRoot('/') REQUEST.setServerURL(protocol='https', hostname='www.example.com', port='443') else: REQUEST.setVirtualRoot('/') REQUEST.setServerURL(hostname='www.example.com', port='80') Problem 2: ZCatalog ===================== All the objects in /websites/example are being catalogged with paths such as /websites/example/folder/myObject. However, when I gets the objects path using getpath(), it's not adjusted based on the virtual hosting settings - it's still /websites/example/folder/myObject, not /folder/myObject as it should be. Problem 3: Management interface ================================= The breadcrumbs in the folder management screen (e.g. "/ folder1 / folder2"), still show the "/ websites / example", with links, when using the virtual hosting. That is, the managemnt interface shows folders that we are not supposed to be able to access when we are using virtual hosting. Problem 4: Access to other virtual hosts (security issue?) ============================================================ When using virtual hosting, it is still possible to access the /websites folder for example, using acquistion. So I can view the contents of one website from the other: www.example.com/websites/example2, and www.example2.com/websites/example. -- Itamar S.T. itamar(a)maxnm.com Fingerprint = D365 7BE8 B81E 2B18 6534 025E D0E7 92DB E441 411C

3 7