[Zope3-dev] Re: Thread problems

[Peter Mayne]

Philipp von Weitershausen wrote:
> Peter Mayne wrote:
> 
>> I'm creating a thread using the Python threading module to perform a 
>> long running task.
>>
>> As soon as I attempt to modify something, I get:
>>
>> Exception in thread Thread-3:
>> Traceback (most recent call last):
>>   File "/usr/local/lib/python2.3/threading.py", line 436, in __bootstrap
>>     self.run()
>>   File "/home/zope/zopex3/lib/python/imdb/browser/loader.py", line 47, 
>> in run
>>     self._loader()
>>   File "/home/zope/zopex3/lib/python/imdb/browser/loader.py", line 
>> 192, in loadActors_
>>     parent = self.getSubfolder(ACTORS_FOLDER)
>>   File "/home/zope/zopex3/lib/python/imdb/browser/loader.py", line 57, 
>> in getSubfolder
>>     self.context[name] = subfolder
>> AttributeError: 'zope.thread.local' object has no attribute 'interaction'
>>
>> The thread-local storage seems to be where zope.security stores its 
>> stuff. How do I get my thread to inherit the right security?
> 
> - start an interaction in the thread and use a participation that either 
> has all privileges like SystemConfigurationParticipation (again, if you 
> don't care about security) or use the participation(s) from the original 
> thread that started out with a request so that the stuff that is 
> executed in your thread runs under the same privileges as the original one.
> 
> The functions you need to use (newInteraction, endInteraction, 
> getInteraction) are in zope.security.management. The interfaces in 
> zope.security.interfaces should give you some clues. And in January you 
> can buy my book *wink*.

I figured all of that out from Stephan's book and looking at the source. 
I was hoping you could fill in the final bit and tell me *how* to use 
those functions.

I tried the obvious thing of passing the result of getInteraction() to 
the thread, and doing a newInteraction() as the very first thing when 
the thread starts, but I get:

Traceback (most recent call last):
   File "/usr/local/lib/python2.3/threading.py", line 436, in __bootstrap
     self.run()
   File "/home/zope/zopex3/lib/python/imdb/browser/loader.py", line 48, 
in run
     self._loader()
   File "/home/zope/zopex3/lib/python/imdb/browser/loader.py", line 192, 
in loadActors_
     newInteraction(self._interaction)
   File 
"/tmp/ZopeX3-3.0.0c2/build/lib.linux-i686-2.3/zope/security/management.py", 
line 89, in newInteraction
   File 
"/tmp/ZopeX3-3.0.0c2/build/lib.linux-i686-2.3/zope/app/securitypolicy/zopepolicy.py", 
line 50, in __init__
   File 
"/tmp/ZopeX3-3.0.0c2/build/lib.linux-i686-2.3/zope/security/simplepolicies.py", 
line 30, in __init__
   File 
"/tmp/ZopeX3-3.0.0c2/build/lib.linux-i686-2.3/zope/security/simplepolicies.py", 
line 33, in add
AttributeError: 'ZopeSecurityPolicy' object has no attribute 'interaction'

What *should* I be doing?

PJDM
-- 
Peter Mayne
Spherion Technology Solutions
Canberra, ACT, Australia
"You're given the form, but you have to write the sonnet yourself.
What you say is completely up to you." - Mrs. Whatsit