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Asking advice on best way to perform an interaction with an external webservice
by Marco Bizzarri 02 Aug '08

02 Aug '08

Hi all. I need to implement an interaction with an external web service. The external webservice basically can either provide or accept messages from my zope application. The messages are either produced by my application (and need to be "sent" to the external application via web service) or produced by the external application, and must be processed by mine. I'm asking then for best practice for this sort of interaction. Following what I have read in other threads, I would assume that, for example for sending, I should do something like: - create a queue of objects which needs to be sent, in one transaction; - sent the objects which need to be sent, in another transaction; The problem, of course, is to minimize (if not avoid at all) the chance to have a Conflict with a double sending of the message. In some sense, this is very close to sending an email via an smtp server, therefore, I assume I should at the right products to look for inspirations. Thanks you all for your time. Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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Mouting + Logging Errors after Zope Upgrade 2.7.4 --> 2.11.1
by Wolfgang Lausenhammer 02 Aug '08

02 Aug '08

Hello! My company wants me to upgrade the timeworn zope-2.7.4 to one of the newest ones available. I decided to take zope-2.11.1 but after installing and running it in debug-mode i get the following error-messages: 2008-08-01T09:04:39 ERROR Zope.ZODBMountPoint Failed to mount database. ZODB.lock_file.LockError (Couldn't lock 'D:\\workspace_zope\\xla-2008/var/Stdcontainer_o.fs.lock') Traceback (most recent call last): File "D:\zope\2.11.1\Zope\lib\python\Products\ZODBMountPoint\MountedObject.py", line 257, in _getOrOpenObject File "D:\zope\2.11.1\Zope\lib\python\Products\ZODBMountPoint\MountedObject.py", line 147, in _getMountedConnection File "D:\zope\2.11.1\Zope\lib\python\Products\ZODBMountPoint\MountedObject.py", line 157, in _getDB File "D:\zope\2.11.1\Zope\lib\python\Zope2\Startup\datatypes.py", line 288, in getDatabase db = factory.open(name, self.databases) File "D:\zope\2.11.1\Zope\lib\python\Zope2\Startup\datatypes.py", line 186, in open DB = self.createDB(database_name, databases) File "D:\zope\2.11.1\Zope\lib\python\Zope2\Startup\datatypes.py", line 183, in createDB return ZODBDatabase.open(self, databases) File "D:\zope\2.11.1\Zope\lib\python\ZODB\config.py", line 97, in open File "D:\zope\2.11.1\Zope\lib\python\ZODB\config.py", line 135, in open File "D:\zope\2.11.1\Zope\lib\python\ZODB\FileStorage\FileStorage.py", line 113, in __init__ File "D:\zope\2.11.1\Zope\lib\python\ZODB\lock_file.py", line 80, in __init__ File "D:\zope\2.11.1\Zope\lib\python\ZODB\lock_file.py", line 42, in _lock_file LockError: Couldn't lock 'D:\\workspace_zope\\xla-2008/var/Stdcontainer_o.fs.lock' .... TypeError: not all arguments converted during string formatting Traceback (most recent call last): File "D:\zope\2.11.1\Python\Lib\logging\__init__.py", line 731, in emit File "D:\zope\2.11.1\Python\Lib\logging\__init__.py", line 617, in format File "D:\zope\2.11.1\Python\Lib\logging\__init__.py", line 405, in format File "D:\zope\2.11.1\Python\Lib\logging\__init__.py", line 276, in getMessage self.cfg.eventlog() These are not the only ones, I get the first one for 5/18 databases and the second one 6 times when running the /manage site Do I have to be worried about those error messages or not? Another thing is that those messages appear only once every restart but the functionality of the pages hostet isn't affected... Hope you can help me, -- Wolfgang

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CorruptedDataError: How to fix a corrupted
by Remy Pinsonnault 02 Aug '08

02 Aug '08

For an unknown reason, it seems our data.fs got corrupted last night. In the event.log I can see the following: ------ 2008-07-30T22:51:59 ERROR ZODB.Connection Couldn't load state for 0x086540 Traceback (most recent call last): File "C:\PloneExt\Zope\lib\python\ZODB\Connection.py", line 704, in setstate self._setstate(obj) File "C:\PloneExt\Zope\lib\python\ZODB\Connection.py", line 740, in _setstate p, serial = self._storage.load(obj._p_oid, self._version) File "C:\PloneExt\Zope\lib\python\ZODB\FileStorage\FileStorage.py", line 549, in load h = self._read_data_header(pos, oid) File "C:\PloneExt\Zope\lib\python\ZODB\FileStorage\format.py", line 193, in _read_data_header raise CorruptedDataError(oid, s, pos) CorruptedDataError: Error reading oid 0x086540. Found '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' at 10020462 ------ We tried to use the fsrecover.py utility but it gives us the following error when we run against the damaged data.fs: "input is not a file storage" Now is there anybody that knows how we could restore our data.fs because we have important data in it? Thanks in advance Remy

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manage_cutObjects/manage_pasteObjects problem ...
by Ajay Deshpande 02 Aug '08

02 Aug '08

Hi all: Ive been trying to cut objects from one context and paste them into another using a script python. But I get a "CopyError" when I try doing this. This is my code snippet and the traceback ... Snippet... ... obj = context.restrictedTraverse(path) obj_parent = obj.aq_inner.aq_parent dest_folder = context.Dest # this is a folder object copy_info = obj_parent.manage_cutObjects((context.getId())) dest_folder.manage_pasteObjects(copy_info) ... Traceback: Traceback (innermost last): Module ZPublisher.Publish, line 115, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 41, in call_object Module OFS.CopySupport, line 194, in manage_pasteObjects Module OFS.CopySupport, line 527, in _verifyObjectPaste Copy Error: <HTML> <HEAD> <TITLE>Not Supported</TITLE> </HEAD> <BODY BGCOLOR="#FFFFFF"> <FORM ACTION="manage_main" METHOD="GET" > <TABLE BORDER="0" WIDTH="100%" CELLPADDING="10"> <TR> <TD VALIGN="TOP"> <BR> <CENTER><B><FONT SIZE="+6" COLOR="#77003B">!</FONT></B></CENTER> </TD> <TD VALIGN="TOP"> <BR><BR> <CENTER> The object <em>dtmij.txt</em> does not support this operation. </CENTER> </TD> </TR> <TR> <TD VALIGN="TOP"> </TD> <TD VALIGN="TOP"> <CENTER> <INPUT TYPE="SUBMIT" VALUE=" Ok "> </CENTER> </TD> </TR> </TABLE> </FORM> </BODY></HTML> .... I cannot perform this operation directly using the ZMI also. So it is not a problem with the script. Some issue in CopySupport. I searched for the resolution and found that CopySupport needs to be patched. But I couldnt find the patch anywhere. My Zope is 2.9.4-final, Python2.4.3. Any help is greatly appreciated. TIA, Aj "And the trees are all kept equal By hatchet, axe, and saw"

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Timeout on server when python script is running
by sguglia＠arrows.it 02 Aug '08

02 Aug '08

Hello everybody! I have a python script running from a plone site..it takes a lot of time (1 hour maybe more) but I need to run it just for data recovery if something goes wrong. after about 20 minutes a "Timeout on server" message pops up.. I tried and found where to change timeouts in zope.conf, but nothing changed. Wrong place? Please help, thanks! Stef

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Asking advice on a Zope "stuck" (or: what did I do wrong?)
by Marco Bizzarri 02 Aug '08

02 Aug '08

Hi all. While using ab to perform stress tests on an application, I've run in a situation where I have a "locked" Zope. I installed DeadlockDebugger, and tried to have a dump from it, but it is unable to answer, at leasts it seems to me. So, I followed the recipe from ZopeLabs: http://www.zopelabs.com/cookbook/1073504990 and got a traceback from gdb. info threads gives the following: * 5 Thread 0xb5b29b90 (LWP 17713) 0xffffe410 in __kernel_vsyscall () 4 Thread 0xb5322b90 (LWP 17714) 0xffffe410 in __kernel_vsyscall () 3 Thread 0xb4b21b90 (LWP 17715) 0xffffe410 in __kernel_vsyscall () 2 Thread 0xb4320b90 (LWP 17716) 0xffffe410 in __kernel_vsyscall () 1 Thread 0xb7d4b8c0 (LWP 17687) 0xffffe410 in __kernel_vsyscall () I'm including the traceback. As you can see, the last lines tell (for all the threads) are: File "/var/local/zope28/base288/lib/python/Shared/DC/ZRDB/Results.py", line 55, in __init__ if n != name: aliases.append((n, SQLAlias(name))) File "<string>", line 1, in ? Just one note: environment is Linux, Zope 2.8.8, python2.3 I understand Zope+python is quite old, so I'm just asking if there is some "general" purpose advice on what to do in this case. Regards Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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Asking recipe for caching objects
by Marco Bizzarri 01 Aug '08

01 Aug '08

Hi all. I have a zope application which uses a db (postgreSQL) to store and retrieve data. I would like to cache it. It is ok for me to cache them on thread-base. Up to now I've used a simple _v_ attribute, with a dictionary. The approach works, but: - the _v_ attribute is not transactional (and transactions could be rerun due to conflicts), - the dictionary can grows indefinitively. Therefore, I'm looking to see if there is a ready solution for this problem. Thanks you all in advance for your advice Regards Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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Re: [Zope] Asking recipe for caching objects
by Marco Bizzarri 01 Aug '08

01 Aug '08

Thanks for your suggestions, Andreas. Any chance these are going to work under Zope 2.8? Regards Marco On Fri, Aug 1, 2008 at 4:04 PM, Andreas Jung <lists(a)zopyx.com> wrote: > > > --On 1. August 2008 15:55:41 +0200 Marco Bizzarri <marco.bizzarri(a)gmail.com> > wrote: > >> Hi all. >> >> I have a zope application which uses a db (postgreSQL) to store and >> retrieve data. I would like to cache it. >> >> It is ok for me to cache them on thread-base. Up to now I've used a >> simple _v_ attribute, with a dictionary. >> > >> Therefore, I'm looking to see if there is a ready solution for this >> problem. > > gocept.cache > plone memoize > > ? > > -aj -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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Zope product and dtml-tree
by Rowan Woodhouse 31 Jul '08

31 Jul '08

Hi, I'm developing a Zope product that uses a dtml file to generate the html page. I'd like to include a dtml-tree based tree for navigation on the page. The custom object inherits from SimpleItem. When I include the follow code in the dtml file: <dtml-tree> <dtml-var id> </dtml-tree> I get the following exception: An error was encountered while publishing this resource. exceptions.KeyError Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 202, in publish_module_standard * Module ZPublisher.Publish, line 150, in publish * Module ZPublisher.Publish, line 119, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 42, in call_object * Module Products.WellGroup.WellGroup, line 110, in index_html * Module App.special_dtml, line 65, in __call__ * Module DocumentTemplate.DT_String, line 476, in __call__ * Module TreeDisplay.TreeTag, line 88, in render * Module TreeDisplay.TreeTag, line 192, in tpRender KeyError: 'URL' If I add a class variable called URL I then get a key error for RESPONSE. My understanding from documentation is that Item (from which SimpleItem inherits) gives the product basic dtml-tree support. I can't find any examples that spell out how to write a product that supports dtml-tree tags. Could someone point me in the right direction? Thanks, Rowan

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Problems with buildout and zope.interface
by Christian Scholz 31 Jul '08

31 Jul '08

Hi there! I am trying right now to convince people to use buildout and ZCA for the Open Grid Protocol project but it turns out that it's not working as expected. So maybe somebody on here can help me :-) The setup is Mac OSX 10.5.4 with Python 2.5.1 installed and apparently a zope.interface egg inside the standard install of Python of version 3.3.0. (you can see the contents of the lib dir her: http://pastebin.com/d3f5fb455) On some machines it now seems that this version is used instead of using a newer one the system wide installed one is used (for some reason not on my own machine), so the for instance the testrunner script looks like this: http://pastebin.com/d1a1024d2 (as you can see the standard lib is put into the path but not a separate zope.interface egg). The problem it comes down to when running buildout is the following: http://pastebin.com/d1ec846fa The important lines are probably: # File "/Users/tess/pyogp/eggs/zope.security-3.5.1-py2.5-macosx-10.5-i386.egg/zope/security/interfaces.py", line 20, in <module> # from zope.interface.common.interfaces import IException, IAttributeError # File "/System/Library/Frameworks/Python.framework/Versions/2.5/Extras/lib/python/zope/interface/common/interfaces.py", line 80, in <module> # classImplements(OverflowWarning, IOverflowWarning) # ZopeXMLConfigurationError: File "/Users/tess/pyogp/src/pyogp.lib.base/pyogp/lib/base/configure.zcml", line 6.2-6.55 # ZopeXMLConfigurationError: File "/Users/tess/pyogp/eggs/zope.component-3.4.0-py2.5.egg/zope/component/meta.zcml", line 7.4-11.10 # NameError: name 'OverflowWarning' is not defined So zope.component 3.4.0 probably needs zope.interface 3.4.x but installed is 3.3.0. Now my question is: How can I solve this problem. I think I tried to put zope.interface>=3.4 into all sorts of places but one outcomes only seemed to be a version conflict saying that 3.3.0 is installed already (unfortunately I also cannot test this myself as in my case it's working). Here is the buildout.cfg: http://svn.secondlife.com/svn/linden/projects/2008/pyogp/buildouts/libdev_m… There also is a setup.py which contains the following dependencies: install_requires=[ 'setuptools', # -*- Extra requirements: -*- 'zope.interface>=3.4', 'zope.component [zcml]', 'WebOb', 'wsgiref', 'grokcore.component', ], (http://svn.secondlife.com/svn/linden/projects/2008/pyogp/pyogp.lib.base/tru…) And you can find the whole buildout here: http://svn.secondlife.com/svn/linden/projects/2008/pyogp/buildouts/libdev_m… (this is a special version which only runs with Python2.5 and installed a development version of setuptools which I bundled with it because of the problems with subversion 1.5. I suspect though that it also fixed some other bugs as people here constantly seemed to have problems with buildout which now seems to be reason enough to move away from buildout and the Zope Component Architecture). Hope somebody can help :-) Thanks! Christian -- Christian Scholz video blog: http://comlounge.tv COM.lounge blog: http://mrtopf.de/blog Luetticher Strasse 10 Skype: HerrTopf 52064 Aachen Homepage: http://comlounge.net Tel: +49 241 400 730 0 E-Mail cs(a)comlounge.net Fax: +49 241 979 00 850 IRC: MrTopf, Tao_T neue Show: TOPFtäglich (http://mrtopf.de/blog/category/topf-taglich/)

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