April 2008 - Zope - Zope lists

how many zope instances
by Garry Saddington 06 Apr '08

06 Apr '08

I have tried to find information on how many Zope instances can be run on a single machine but all searches have failed to be definitive. Is there any information on this, because I would like to have a separate instance for each of my customers running on a different port number and it would be useful to be able to predict the number of servers I would need. Regards Garry

4 5

Analyzing a ZODB.
by Manuel Vazquez Acosta 06 Apr '08

06 Apr '08

Hi all, Recently I was appointed to improve a Plone's performance, and I have the following issue: I see too many transactions made by the anonymous user. I can reproduce this behaviour: just watching the home page produces a transaction at /index by None. I wonder if there's a way to actually see what objects (or object types) are modified by those transactions. So I can go directly to the source of the (surely innecesary) transaction. I tried analyze.py but I don't grasp the output accurately. Best regards, Manuel.

3 4

Re: Hooking persistent.Persistent.__setstate__ was Re: [ZODB-Dev] Analyzing a ZODB.
by Jim Fulton 06 Apr '08

06 Apr '08

On Apr 5, 2008, at 6:30 PM, Alan Runyan wrote: > Here is something more ZODB and less Zope related (kinda). > > I was talking with Benji a few weeks ago about a problem that should > be easy to debug but was not. Here is the scenerio: > > - Customer has software on a remote machine. They are seeing > unnecessary transaction commits. Just like the guy 'Analyzing a > ZODB'. > > - Customer is completely incapable of doing anything other than > putting > a script on the filesystem. > > - Benji and I thought about it and he proposed 'the simplest thing > that > c/should work, monkey patch persistent.__setstate__' so that I > could see > what objects were being mutated. That doesn't show you which objects are being mutated. It only shows you which objects are being loaded. If you want to see what objects are actually being mutated, it would be better, IMO, to set up some sort of event channel on object invalidations. If you want to see what code is mutating objects, it would be better to set breakpoints in Connection.register. > > - Unfortunately ZODB 3.x does not have a Python fallback of > persistent.Persistent -- its in C. The customer did not have a C > compiler > on their box. > > IIRC how I solved it was increase ZEO event log to see the oid's. > Then I > walked him through loading the oid up to see what object was being > mutated. It was more painful than it should have been. Yup, but automating something like this might have been informative without being painful. > Question: Is it possible for ZODB 3.9 to have a pure python > implementation of persistent.Persistent? Probably. > Maybe this would be a good > ZODB GSOC project? The current C-level persistence implementation is rather nasty because of the close coupling with the persistent cache implementation. My goal is to come up with a new persistence implementation that is much simpler and more flexible with both Python and C implementations. I haven't had time to work on this though. :( If someone wanted to work on this, I'd be happy to go into more detail. ... > - increasing zeo server log level and watching oid's being changed > is sort-of the equivalent of turning on RDBMS logging to see SQL > stmt's being executed. Unfortunately I believe without having a > hook in persistent.Persistent we can never really get that level > of granularity (i.e. __getattribute__ is only accessible in client) > with only ZEO server logs. Regardless of whether it's implementation is in C or Python, the current implementation is complex and highly coupled. A more flexible system that I envision, would make it easier to experiment with alternate cache implementations and would also make it easier to substitute implementations that did more logging for debugging purposes. > This is a transparent plea for a "new feature". But I believe it > would > significantly help people writing ZODB applications. > > Maybe people should always have a base class that you override > those methods which delegate to persistent.Persistent. i.e. > class MyMixin(persistent.Persistent) and mixin MyMixin > instead of mixin persistent.Persistent directly? Then > you can instrument the MyMixin with the logging? That would introduce lots of overhead and complexity that I don't think is warranted. Jim -- Jim Fulton Zope Corporation

1 0

Passing an instance in a form to a product method
by Ulla Theiss 04 Apr '08

04 Apr '08

Hello List, I have to pass an instance of a self-defined class within a form to a product method. I try it in the following way: <form action="addUploadFile" enctype="multipart/form-data" target="main" method=post> <input name="doc:instance" value="<dtml-var doc>" type="hidden"> <input name="addFile" value="add File" type="submit"> </form> But within the method addUploadFile, always the parameter doc is passed as a string (the name of the instance) Does anybody know, what I have to change, that it works? Many thanks in advance Ulla.

2 3

step by step going from single zope to zeo
by David Bear 02 Apr '08

02 Apr '08

Are there any step by step guidelines for how to modify a current single instance zope into a zeo configuration? I have a single zope instance. That zope.conf define two mount points for multiple zodb's. I would like to take that single instance and turn it in to a zeo server, with to zeo clients. Are they any recent howto's on this? -- David Bear College of Public Programs/ASU 411 N Central, Phoenix, AZ 85004

2 1

http://www.benjiyork.com/quick_start/ - tutorial - problems with...
by michael nt milne 01 Apr '08

01 Apr '08

Hi Seems to be a couple of problems with this tutorial: http://www.benjiyork.com/quick_start/ 1. Adding this to your configure.zcml <browser:addMenuItem class=".hello.HelloWorld" title="QS Hello World" permission="zope.ManageContent" /> doesn't add anything to the add item drop-down in Zope 2. When following all the steps exactly and going to http://localhost:8080/hello You get a resource not found. By the way the <include package="hello" />...shouldn't that be <include package="hello" file="configure.zcml" />? Thanks -- michael

1 0

worldcookery.com five tutorial ploneconf05 - AttributeError: DateTime instance has no __call__ method...
by michael nt milne 01 Apr '08

01 Apr '08

Hi Been following this turorial at: http://worldcookery.com/files/ploneconf05-five/index.html Using Plone 3.0.6. and Zope 2.10.5 and trying to view http://localhost:8080/portal/news/atom.xml leads me to the below error. Plone 3 thing? Module zope.tales.tales, line 696, in evaluate - URL: index - Line 22, Column 3 - Expression: <PythonExpr (obj.modified().HTML4())> - Names: {'container': <ATBTreeFolder at /portal/news>, 'context': <ATBTreeFolder at /portal/news>, 'default': <object object at 0x008BB528>, 'here': <ATBTreeFolder at /portal/news>, 'loop': {u'obj': <Products.PageTemplates.Expressions.PathIterator object at 0x082FFB10>}, 'nothing': None, 'options': {'args': (<Products.Five.metaclass.SimpleViewClass from C:\Enfold\Products\FiveFeeds\atom.pt object at 0x082FFD50>,)}, 'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x0864EE68>, 'request': <HTTPRequest, URL=http://localhost:8080/portal/news/atom.xml>, 'root': <Application at >, 'template': <ImplicitAcquirerWrapper object at 0x082FFDD0>, 'traverse_subpath': [], 'user': <PropertiedUser 'michael'>, 'view': <Products.Five.metaclass.SimpleViewClass from C:\Enfold\Products\FiveFeeds\atom.pt object at 0x082FFD50>, 'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0x082FF990>} Module zope.tales.pythonexpr, line 59, in __call__ - __traceback_info__: (obj.modified().HTML4()) Module <string>, line 0, in ? AttributeError: DateTime instance has no __call__ method -- michael

2 1

Problem with WebDAV and non-ascii titles
by Pawel Lewicki 01 Apr '08

01 Apr '08

Hi, I have a problem with accessing files with non-ascii titles via Enfold Desktop (WebDAV)- Zope 2.10.4). Traceback (innermost last): Module ZPublisher.Publish, line 119, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 42, in call_object Module webdav.Resource, line 286, in PROPFIND Module webdav.davcmds, line 124, in apply Module OFS.PropertySheets, line 344, in dav__allprop UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 47: ordinal not in range(128) Is it a bug? I solved my problem with extra line: -------------- + result = [r.decode('ascii', 'ignore') for r in result] result='\n'.join(result) return propstat % (self.xml_namespace(), result, '200 OK', '') -------------- Pawel Lewicki

2 2

ZSyncer & Zope 2.10
by Craig Chasseur 01 Apr '08

01 Apr '08

Hello All, We've recently completed an upgrade to Zope 2.10.5 on one of our servers and we've begun to encounter problems with ZSyncer. We use ZSyncer to synchronize objects between this server and another running Zope 2.9.8 (both have ZSyncer 0.7.1 installed). When attempting to "put" folders from the 2.10 server to the 2.9 server, the process hangs and nothing is transferred. However, when we attempt to put individual objects, we are successful. Does anyone know what might be the cause of this issue? ZSyncer 0.7.1, which is the latest release, claims that it may not be compatible with Zope 2.9 and up, but we were able to use it successfully before this most recent upgrade to 2.10. If anyone is aware of a fix or a workaround, or simply has an insight into why this breaks for us, I would greatly appreciate the help. Sincerely, Craig Chasseur University of Michigan

3 3