[Zope] Re: ZEO, Persistent Sessions

Travis Miller travis at ctln.org
Mon Aug 16 10:03:51 EDT 2004 

hi

continuing the persistent sessions battle...

periodically, after zeo is running fine for a few days, this error 
occurs anytime an object within a plone site is accessed.

i think (i will double check if this happens again) the temp_folder 
mount is broken and anytime request.SESSION is called, the error is 
returned.

Traceback:
----------------

Site Error

An error was encountered while publishing this resource.

SystemError
Sorry, a site error occurred.

Traceback (innermost last):

     * Module ZPublisher.Publish, line 180, in publish_module_standard
     * Module Products.PlacelessTranslationService.PatchStringIO, line 
51, in new_publish
     * Module ZPublisher.Publish, line 131, in publish
     * Module Zope.App.startup, line 204, in zpublisher_exception_hook
     * Module ZPublisher.Publish, line 101, in publish
     * Module ZPublisher.mapply, line 88, in mapply
     * Module ZPublisher.Publish, line 39, in call_object
     * Module Products.CMFCore.PortalContent, line 116, in __call__
     * Module Shared.DC.Scripts.Bindings, line 306, in __call__
     * Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
     * Module Products.CMFCore.FSPageTemplate, line 191, in _exec
     * Module Products.CMFCore.FSPageTemplate, line 124, in pt_render
     * Module Products.PageTemplates.PageTemplate, line 96, in pt_render
       <FSPageTemplate at /Portals/example.org/www/document_view used 
for /Portals/example.org/www/index_html>
     * Module TAL.TALInterpreter, line 189, in __call__
     * Module TAL.TALInterpreter, line 218, in interpret
     * Module TAL.TALInterpreter, line 233, in interpret
     * Module TAL.TALInterpreter, line 663, in do_useMacro
     * Module TAL.TALInterpreter, line 233, in interpret
     * Module TAL.TALInterpreter, line 408, in do_optTag_tal
     * Module TAL.TALInterpreter, line 393, in do_optTag
     * Module TAL.TALInterpreter, line 388, in no_tag
     * Module TAL.TALInterpreter, line 233, in interpret
     * Module TAL.TALInterpreter, line 552, in do_insertTranslation
     * Module TAL.TALInterpreter, line 615, in translate
     * Module Products.PageTemplates.TALES, line 264, in translate
     * Module 
Products.PlacelessTranslationService.PlacelessTranslationService, line 
113, in translate
     * Module 
Products.PlacelessTranslationService.PlacelessTranslationService, line 
504, in translate
     * Module 
Products.PlacelessTranslationService.PlacelessTranslationService, line 
416, in getCatalogsForTranslation
     * Module 
Products.PlacelessTranslationService.PlacelessTranslationService, line 
541, in negotiate_language
     * Module Products.PlacelessTranslationService.Negotiator, line 261, 
in negotiate
     * Module Products.PlacelessTranslationService.Negotiator, line 266, 
in _negotiate
     * Module Products.PlacelessTranslationService.Negotiator, line 54, 
in getLangPrefs
     * Module Products.PlacelessTranslationService.Negotiator, line 172, 
in getAccepted
     * Module ZPublisher.HTTPRequest, line 1218, in __getattr__
     * Module ZPublisher.HTTPRequest, line 1178, in get
     * Module Products.Sessions.SessionDataManager, line 94, in 
getSessionData
     * Module Products.Sessions.SessionDataManager, line 183, in 
_getSessionDataObject

SystemError: error return without exception set (Also, an error
occurred while attempting to render the standard error message.)


note: i've used a temporarystorage export from zeo instead of the 
standard local temporary storage as indicated in my prior post below.

thanks,
travis


On Aug 2, 2004, at 3:14 PM, Travis Miller wrote:

> problem solved. always google just a bit longer ;-)
>   http://longsleep.org/projects/sessioncrumbler
>
> the patch does appear in zope 2.7.1
>
> thanks,
> travis
>
>
> On Aug 2, 2004, at 2:44 PM, Travis Miller wrote:
>
>> hi,
>>
>> my zeo setup is running like a top :-) ...until!
>>
>> i would like my zeo clients to share the same session storage.
>>
>> out of the box, zope has a temporary storage database (/temp_folder) 
>> for the session data (/temp_folder/session_data). the session data 
>> manager (/session_data_manager) is then configured to pull from the 
>> session data (/temp_folder/session_data).
>>
>> my first inclination was to create another session data object 
>> (/session_folder/session_data) in the main database and to configure 
>> the session data manager to pull from it. (i've also tried using a 
>> separate zeo filestorage and mounting it. as expected, i saw the same 
>> results through out.)
>>
>> however, when i do this, it seems as though only one zeo client is 
>> allowed to use the session. a simple python script that prints 
>> request.SESSION succeeds on one client, but fails with a key error on 
>> the other.
>>
>>
>> Traceback (innermost last):
>>   Module ZPublisher.Publish, line 101, in publish
>>   Module ZPublisher.mapply, line 88, in mapply
>>   Module ZPublisher.Publish, line 39, in call_object
>>   Module Shared.DC.Scripts.Bindings, line 306, in __call__
>>   Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
>>   Module Products.PythonScripts.PythonScript, line 323, in _exec
>>   Module None, line 7, in test-session
>>    - <PythonScript at /Portals/test-session>
>>    - Line 7
>>   Module ZPublisher.HTTPRequest, line 1218, in __getattr__
>>   Module ZPublisher.HTTPRequest, line 1178, in get
>>   Module Products.Sessions.SessionDataManager, line 94, in 
>> getSessionData
>>   Module Products.Sessions.SessionDataManager, line 181, in 
>> _getSessionDataObject
>>   Module Products.Transience.Transience, line 768, in new_or_existing
>>   Module Products.Transience.Transience, line 439, in __setitem__
>> KeyError: 1091449200
>>
>>
>> i have:
>>   python 2.3.4
>>   Zope 2.7.1
>> ...compiled from source
>>
>>
>> this was all i could really find on zeo clients sharing sessions. it 
>> seems to support what i have attempted:
>>   http://www.zopelabs.com/cookbook/1061234337
>>
>>
>> what might i be missing?
>> if sharing the session is a bad idea. where else could i store 
>> session like information for a script based application?
>>
>>
>> thanks for any help
>>
>>
>> thanks,
>> travis
>>
>
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