July 2000 - Zope-Dev

zpatterns: how to specify default values?
by Jephte CLAIN 13 Jul '00

13 Jul '00

hello, a common practice is to put default values for attributes for a classe as class variables. if the instance hasn't got the value, it gets the value from the class. but I can't do this with dataskins, because direct dataskins attributes take precedence on attributes providers. the way I do it now is to make a default_attributes attribute provider which provides defaults. is this correct? or is there a better way to do this? regards, jephte.clain(a)univ-reunion.fr

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External Method Missery
by Chris Withers 13 Jul '00

13 Jul '00

I think this is a bgu so I'll chuck it into the collector unless someone tells me otherwise... I have an external method called navTree (dtml-tree was too broken to fix in the time frame :( ) with a spec as follows: def navTree(self,start): It's called in some DTML as: <dtml-var "nav_tree(PARENTS[-2])"> which is fine, unless I call it with the following: <dtml-var "nav_tree(start=PARENTS[-2])"> in which case I get: TypeError: not enough arguments; expected 2, got 0 which is not very helpful :( Any ideas? cheers, Chris PS: Traceback (innermost last): File /mnt/data/2/zope/external/2-1-6/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /mnt/data/2/zope/external/2-1-6/lib/python/ZPublisher/Publish.py, line 179, in publish File /mnt/data/2/zope/external/2-1-6/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: ElementWithAttributes) File /mnt/data/2/zope/external/2-1-6/lib/python/ZPublisher/Publish.py, line 165, in publish File /mnt/data/2/zope/external/2-1-6/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: index_html) File /mnt/data/2/zope/external/2-1-6/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: index_html) File /mnt/data/2/zope/external/2-1-6/lib/python/OFS/DTMLMethod.py, line 150, in __call__ (Object: index_html) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: index_html) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_Util.py, line 335, in eval (Object: _[REQUEST['lang']]) (Info: REQUEST) File <string>, line 0, in ? File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_Util.py, line 161, in careful_getitem File /mnt/data/2/zope/external/2-1-6/lib/python/OFS/DTMLDocument.py, line 162, in __call__ (Object: en) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: en) File /mnt/data/2/zope/external/2-1-6/lib/python/OFS/DTMLMethod.py, line 146, in __call__ (Object: standard_html_header) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: standard_html_header) File /mnt/data/2/zope/external/2-1-6/lib/python/OFS/DTMLMethod.py, line 146, in __call__ (Object: left_menu) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: left_menu) File /mnt/data/2/zope/external/2-1-6/lib/python/DocumentTemplate/DT_Util.py, line 335, in eval (Object: nav_tree(start=PARENTS[-2])) (Info: PARENTS) File <string>, line 0, in ? File /mnt/data/2/zope/external/2-1-6/lib/python/Products/ExternalMethod/ExternalMethod.py, line 248, in __call__ (Object: nav_tree) (Info: ((), {'start': <Folder instance at 86d4de0>}, None))

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Beginning Zope User
by John Gunnar Carlsson 13 Jul '00

13 Jul '00

Help! I downloaded a product and uploaded it to my directory, but I don't know how to unzip it. I'm using NT. Whenever I load WinZip it will only let me unzip it to local places on the hard disk but nowhere on the Zope directory itself.

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RE: [Zope-dev] zope and UNIX permissions
by Chris McDonough 13 Jul '00

13 Jul '00

> > Hmmm... thanks for trying it. This doesn't seem much of a > risk, does > > it? > > Not that I can see off-hand. It is only a socket, a means for > communicating with Zope. The 'risk' would only lie in Zope's Security > mechanisms. ;-) > > The only possible risk would be a DoS type manuever if random > user could > rewrite the pcgi.soc socket. You could control this through var > directory permissions, will try this out and report back. You're the coolest! Thanks..

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RE: [Zope-dev] zope and UNIX permissions
by Chris McDonough 13 Jul '00

13 Jul '00

> > The other file (pcgi.soc) is a unix domain socket... it > gets created > > when you run "python w_pcgi" as a Zope install command from > the source > > distribution. I'm not sure of the danger of having this get created > > 777. It might be worthwhile to look into what could be done to it. > > Well, other than zope not responding over pcgi if it isn't 777? > I just tried this out of curiousity. No response through pcgi. Hmmm... thanks for trying it. This doesn't seem much of a risk, does it?

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ZPatterns -- trigger add events not working
by Steve Alexander 12 Jul '00

12 Jul '00

I have a GenericTrigger in a Folder with Customizer support. When I set it to trigger upon Add, my method doesn't get triggered when I add a new DataSkin-derived-ZClass instance. However, when I set it to trigger on Change, my method gets called on adding a new DataSkin. I can't see anything obviously amiss in the ZPatterns code. I've inserted print statements into the _objectChanging() and _objectAdding() methods of DataManagers.DataManager. It seems that when I add a DataSkin-derived-ZClass, it gets added and also changed set in a single transaction, and only one of them gets reported to the trigger. Strangely, the call to _objectChanging() comes before the call to _objectAdding(). Is this a bug, or is it the expected behaviour? Thanks. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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ZPatterns: Errors in triggered methods + patch
by Steve Alexander 12 Jul '00

12 Jul '00

Latest ZPatterns release. Zope 2.2b4. If I raise an error in an external method that is called by a GenericTrigger, I sometimes get a strange log message: 2000-07-12T15:20:07 ERROR(200) ZODB Couldn't load state for '\000\000\000\000\000\000\021=' Traceback (innermost last): File .../lib/python/ZODB/Connection.py, line 441, in setstate File .../lib/python/ZODB/FileStorage.py, line 584, in load (Object: .../var/Data.fs) File .../lib/python/ZODB/FileStorage.py, line 560, in _load (Object: .../var/Data.fs) KeyError: p= (Repeated four further times.) (I replaced the path to my zope installation with "...".) Sometimes, the characters after the "KeyError:" will be control characters, and will cause further log output to look like gibberish, until I suspend the Zope process and type "reset" at the xterm console. I'm not sure why this happens. I've had another similar log message from the same sort of cause: 2000-07-12T14:44:01 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 we will not allow transactions to commit from here on 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 135, in end_tran File .../lib/python/Products/ZPatterns/DataManagers.py, line 118, in _cleanup (Object: Transactional) File .../lib/python/ZODB/Connection.py, line 441, in setstate File .../lib/python/ZODB/FileStorage.py, line 584, in load (Object: .../var/Data.fs) File .../lib/python/ZODB/FileStorage.py, line 560, in _load (Object: .../var/Data.fs) KeyError: p I guess the methods that GenericTriggers call aren't supposed to throw exceptions. However, as a safeguard, how about changing the _checkpoint() method of Agents.Agent to this: def _checkpoint(self): # Send 'final' versions of events try: for s,c,m in self._v_tranlog.values(): try: if s is ChangedStatus: self._objectChanged(c,m) elif s is AddedStatus: self._objectAdded(c) else: self._objectDeleted(c,m) except: import sys, traceback, string type, val, tb = sys.exc_info() sys.stderr.write(string.join( \ traceback.format_exception(type, val, tb),'')) del type, val, tb finally: self._v_tranlog.clear() I've put the call to each Agent's "change observed" event in a try-except block. This makes my Zope instance happier when I do stupid things in external methods, and has the additional advantage of insulating other Agents from one particular Agent's problems. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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RE: [Zope-dev] Zope 2.1.6 packages
by Chris McDonough 12 Jul '00

12 Jul '00

Leonardo, Have you looked at http://www.zope.org/Members/mcdonc/HowTos/zopeinstall/ZOPE-INSTALL-HOWTO ? > -----Original Message----- > From: Leonardo Kenji Shikida [mailto:kenji@intelligenesis.net] > Sent: Wednesday, July 12, 2000 7:53 AM > To: zope-dev(a)zope.org > Subject: Re: [Zope-dev] Zope 2.1.6 packages > > > in this case, apache installation seems to be magically perfect :^) > or, in other words, zope is a great tool, but still needs a better > installation. > > K. > > > hi all, > > > > from my own experience i know user nobody is 99 and group > nobody is the > > same on linux, but BSDs seem to have another convention there. on a > > FreeBSD box i looked at right now nobody was user 65534 or so. > > > > as chris mcdonough remarked earlier in this thread, it is much more > > important to get acquanted to your version of tar and use it so that > > your untarring user gets ownership. there is no way anyone > could package > > up a zope distribution to make the ownerships suitable for > all possible > > users out there. > > > > i think common sense is, as always, a better guide than > expecting that > > things will magically be perfect. > > > > jens > > > > _______________________________________________ > 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 ) >

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Another mystery for you ;-)
by Chris Withers 12 Jul '00

12 Jul '00

Hi Steve, Since you found the external methods arguments thing interesting, here's another challenge for you... ;-) (it's actually from the same nav_tree method) I was trying to use 'if o in REQUEST.PARENTS' to expand branches on the way to the currently displayed object and was running into trouble which lead me to try out the following code: `REQUEST.PARENTS[0]`+`o`+`o==REQUEST.PARENTS[0]`+`o is REQUEST.PARENTS[0]` Now, this renders the following in the case where the branch _should_ expand: <Folder instance at 88cbb30><Folder instance at 88cbb30>00 What I don't understand is how two objects, apparently at the same memory location, return false from both 'object1==object2' and 'object1 is object2'. Again, any ideas? cheers, Chris The only vaguely related thing I can think of is that this is happening 'cos I'm working in a version and the folder object has been changed and REQUEST.PARENTS contains the unchanged version while o contains the changed version. If this is causing it, it's a bug ;-)

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Problem with Zope
by Tina Goyne (TT) 12 Jul '00

12 Jul '00

Hi: I am a novice Zope user--my web master left my company and I have been pegged with the responsibility of maintaining our internal website. I am having a problem adding a new folder and then adding a file to the folder. The file is located on another server with appropriate permissions. However, this is the error message I get: Zope Error Zope has encountered an error while publishing this resource. Resource not found Sorry, the requested Zope resource does not exist. Check the URL and try again. Troubleshooting Suggestions The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Can you please direct me on what to do to correct this problem? Thanks. Tina ------------------------------------------------------- TRADING TECHNOLOGIES Internal Operations Tina Marie Cherry-Goyne Global Manager of Internal Operations tina.goyne(a)tradingtechnologies.com Internal Operations +1 847.424.8844 ---------------------------------------------------------

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