- Zope - Zope lists

Re: [Zope] Lock and Transaction in Zope.
by Dieter Maurer 07 Sep '00

07 Sep '00

Aitor Grajal writes: > --=====_9682482706334=_ > Content-Type: text/plain; charset="ISO-8859-1" > Content-Transfer-Encoding: quoted-printable I hate "multipart" or encoded messages to this list (because the digest removes MIME headers (what a stupidity!) and does not give my mail reader a chance to decode them). > ... two requests concurrently accessing the same object ... > The first one crashes, and doesn't finish right.... > I want to know if there is any way to lock ... > about locking resources in Zope. You do strange things... Zope tries hard to avoid locking and uses an optimistic collision policy instead. Several threads can run concurrently on separate copies of an object. If, during commit, a collision is detected, the affected transaction is aborted and (I think I read that) restarted. If you really need locking, you can use Pythons "threading" module (in a package used from an external method). You must be careful, though. Look in the archive for a message from Sean McGrath about the potential problem involved and my reply for a solution. You may also look (as an example) at URL:http://www.dieter.handshake.de/pyprojects/zope/SharedResource.html It uses looks to protect resources shared by several threads. Dieter

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DTML Question on lines
by Coleman, Bryan 07 Sep '00

07 Sep '00

I am trying to itterate through a lines property in the folder so that the options will drop down. I did not think that the following code would work but I could not think of anything else. <dtml-in valid_codes> <option value="<dtml-var valid_codes>"><dtml-var valid_codes> </option> </dtml-in> - Bryan Patrick Coleman Questcon Technologies (336)273-2428 ext-416 bcoleman(a)questcon.com

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Re: [Zope] OSError along with FSSession...
by Dieter Maurer 07 Sep '00

07 Sep '00

Chien-Pin Wang writes: > Zope complains an error type "OSError" and throws the error value > saying [Errno 21] Is a directory: '/usr/local/zope/var/FSSession/' > occasionally since a recent upgrade of FSSession product to 0.4.2. > Following that error will be a series of TransactionErrors for each and > every request Zope received. And only a zope restart could help zope > resume its operations. Since this error only comes up occasionally, I'm > completely clueless on solving it. > .... > File /usr/local/zope/lib/python/Products/FSSession/FSSession.py, line > 208, in > final_commit > (Object: FSSession) > OSError: [Errno 21] Is a directory: '/usr/local/zope/var/FSSession/' Maybe, a bug in "FSSession.final_commit". Look at line 208 of "FSSession.py". I expect some lines before, a filename is constructed for the above directory and session specific data. For some reason, the session specific data leads to an empty filename. Therefore, the operation in line 208 (probably an "os.rename" or other "os" operation) gets the directory rather than a file path. You have two options: * analyse, why the session data leads to an empty filename (this may be difficult) * add a try: ... except: pass around line 208 and wait for the FSSession author to analyse and fix the problem. Dieter

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Re: [Zope] Zope 2.2 & ZopeAttributionButton
by Dieter Maurer 07 Sep '00

07 Sep '00

Ira Hochman writes: > Does anyone know how to set security on ZopeAttributionButton? I do not know how you can directly set permissions for ZopeAttributionButton. But, as a wordaround, you can give "standard_html_footer" an appropriate proxy role. Dieter

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Re: [Zope] The Ascetic Superuser
by Dieter Maurer 07 Sep '00

07 Sep '00

ethan mindlace fremen writes: > Now every object excecutes according to the permision of the owner, > *not* the viewer. It can also run as a proxy role. The > super-bootstrap-user lives outside of "normal" zope authentication & has > permission to do anything save that which NotEvenGodShouldDo. > Therefore, it shouldn't own objects. Am I really expected to understand this "Therefore"? In fact, I do not! Does it mean, that a Superuser can execute any method with *ITS* privileges and not the intersection of its priviledges with the owners privileges? I hope (and expect) not! Why is it much worse when an object is owned by Superuser than by a manager? What are the differences with respect to the Trojan Horse or other security issues? Dieter

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Call for Python Method opinions
by Evan Simpson 07 Sep '00

07 Sep '00

If you want any say in how official Zope Python Methods work, I recommend heading over to: http://dev.zope.org/Wikis/DevSite/Projects/PythonMethods/StandardPythonMetho dModule ...soonest. If you have feedback on any part of the project, please contribute, but the link above is the squishiest part of the design, and possibly the most important to many of you. User-style documentation is still scanty, but getting better. Comments on where it needs to be stronger are welcome. Cheers, Evan @ digicool & 4-am

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Re: [Zope] How to access id and title of document calling standard_html_header
by Dieter Maurer 07 Sep '00

07 Sep '00

Tim Hicks writes: > I have a standard_html_header that is inserted into Zclasses. These > Zclasses have properties including meta_author ... > In standard_html_header, I use code such as <dtml-var meta_author> ... > This works fine and the properties of > the *zclass* are inserted. However, if I put <dtml-var id> into the > standard_html_header, I get the id of standard_html_header, *not* of > the zclass. When I do this, I get the id of the Z class instance. It should be impossible to get the id of the *standard_html_header*, if this header is a DTML *method* (rather than document) as you told us in a different message. Because we see different things, we need to describe carefully, what we do. Apparently, we do not do the same. I have a folder-like ZClass, say ZC, and an instance of this class, say ZI. ZC has a method, say M, using "standard_html_header". "standard_html_header" is a DMTL method (!) rendering "id". When I open "ZI/M", "standard_html_header" renders "ZI", i.e. ZI's id. The same happens, if "standard_html_header" is not in ZI but a ZC method. Now, it is your turn to describe precisely, what you are doing. Dieter

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Re: [Zope] Java applet with inner classes causing probs in Zope
by Eric L. Walstad 07 Sep '00

07 Sep '00

Just a follow-up: Morten Said: // Adding files to Zope through FTP doesn't seem to have the same restrictions. Actually, it did for me. FTP was able to upload all the class files except those with the $ in them (the classes with inner-classes). That's how I found out about the problem. Holger Lehmann said: // What about putting it all in a jar-file ? I tried that, too, but Java would choke on running the Jar file that was served from Zope. If anyone has a working JAR file applet in Zope, I'd love to see the syntax they used! To make my applet work, I had to go into the java code and separate out the inner classes so that every class was in its own file. This turned out to be a lot easier than I expected. Eric. Here's the original message... > Hello all, > > The problem is that inner classes have names like "Parent$Inner.class" > I'm unable to create a Zope file object with a name that includes the dollar > sign. However, the applet won't function without it. > > Has any one overcome this? > > Yes, the applet functions properly when served from apache (but I need to > serve it from Zope). > > Please respond directly to me and mailing list as I am not currently on the > mailing list. > > Thanks, > > Eric.

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wrapped object
by Sven Hohage 07 Sep '00

07 Sep '00

Hallo, while adding ZClass instances by form I get the following traceback: I don't know what's a wrapped object?? And where the problem is. Thanks -->>>>>>> Zope Error Zope has encountered an error while publishing this resource. Error Type: ValueError Error Value: Invalid property value: wrapped object -------------------------------------------------------------------------------- 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. Traceback (innermost last): File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 222, in publish_module File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 187, in publish File C:\Zopppaaa\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook (Object: ElementWithAttributes) File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 171, in publish File C:\Zopppaaa\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: testskript) File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 112, in call_object (Object: testskript) File C:\Zopppaaa\lib\python\OFS\DTMLMethod.py, line 167, in __call__ (Object: testskript) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_String.py, line 502, in __call__ (Object: testskript) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_With.py, line 146, in render (Object: manage_addProduct['DBank']) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_Util.py, line 337, in eval (Object: eingang_DB_add (_.None, _, NoRedir=1)) (Info: eingang_DB_add) File <string>, line 0, in ? File C:\Zopppaaa\lib\python\OFS\DTMLMethod.py, line 163, in __call__ (Object: eingang_DB_add) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_String.py, line 502, in __call__ (Object: eingang_DB_add) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_With.py, line 146, in render (Object: eingang_DB.createInObjectManager(REQUEST['id'], REQUEST)) File C:\Zopppaaa\lib\python\DocumentTemplate\DT_Util.py, line 337, in eval (Object: propertysheets.eingangs_info.manage_editProperties(REQUEST)) (Info: REQUEST) File <string>, line 0, in ? File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 456, in manage_editProperties (Object: Traversable) File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 255, in _updateProperty (Object: Traversable) File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 208, in _wrapperCheck (Object: Traversable) ValueError: (see above)

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ANN: Serving PHP/Perl from Zope update
by andres＠corrada.com 07 Sep '00

07 Sep '00

Hello Zopistas, I have updated the HOW-TO: Serve PHP/Perl within Zope with a nifty alternative by Joseph Wayne Norton. His suggestion allows PHP to call Zope methods. Check it out at www.zope.org/Members/Mamey/PHP. The methods presented in the HOW-TO still have some deficiencies with regards to Authorization and Cookies so suggestions and improvements are very much welcome. ------------------------------------------------------ Andres Corrada-Emmanuel Email: andres(a)corrada.com ------------------------------------------------------

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