[Zope] - BoboPOS problems

[Jim Fulton]

Pavlos Christoforou wrote:
> 
> Hello Zopistas
> 
> I created an extension (a hit counter) that includes the class
> definition in the same source file as the method. After a couple of days
> ZopeHTTPServer crashed without any apparent reason. On restarting I got
> the following errors in the server.log file:
> 
> Traceback (innermost last):
>   File "serve.py", line 99, in ?
>     ZopeHTTPServer.main(args)
>   File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 456, in main
>     start(module_file,host,port,threading,env)
>   File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 405, in start
>     set_published_module(module_file,BoboRequestHandler,env)
>   File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 401, in set_published_module
>     __import__(name) # to catch problem modules right away
>   File "/home/pavlos/Zope-1.9.0b2-src/lib/python/Main.py", line 103, in ?
>     Bobobase=OFS.Application.open_bobobase()
>   File "/home/pavlos/Zope-1.9.0b2-src/lib/python/OFS/Application.py", line 319, in open_bobobase
>     app._setObject('Control_Panel', cpl)
>   File "/home/pavlos/Zope-1.9.0b2-src/lib/python/BoboPOS/PickleJar.py", line 261, in setstate
>     state = unpickler.load()
> SystemError: Failed to import class Counter from module __main__

I need to figure out a way to handle this more gracefully.
 
> As I understand the problem has to do with pickle not finding the class
> definition. I assume that the External methods object uses exec to load
> and store only the function definition into Zope/BoboPOS and not any other
> code that finds in the source file.

Yes.
 
> I hacked Main.py and included a
> from Counter import Counter

You are close.  Try:

import __main__, Counter
__main__.Counter=Counter.Counter 

> but it did not work. So now I am stuck without Zope :-(
> Also the change was made 2 days ago and all objects from there on include
> refrences to the counter object.
> 
> Am I missing something simple or have I messed things up badly?

It would be a good idea to avoid creating persistent objects in
external methods.  If an external method wants new
classes that get pickled, it should:

  - Become a product, or

  - Use a class defined in a module in the package
    (or a subpackage of the package):

      Shared.your_org

    where your_org is your organization or name.

Maybe I should add an option to cPickle to make it
barf if an attempt is made to pickle an object in
__main__.


Jim

--
Jim Fulton           mailto:jim@digicool.com
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