Oops forgot to include "import os" in my example code. It was imported
elsewhere in my app. With that correction, I have now reproduced the
problem in a new app containing nothing but the example code.
I've tried googling the PicklingError message and found some
references to problems under WSGI, but they seemed to be GAE related
and the explanations weren't very clear (or at least not easy to
understand :-)
Any help much appreciated,
Mike
On May 6, 2:34 pm, MikeEllis <michael.f.el...@gmail.com> wrote:
> More info:
>
> I've confirmed that any class defined in the modules directory can
> reproduce the problem. To verify, create a new module named
> "dummyclass.py" containing
>
> import uuid
> class Problem(object):
> """ Just to validate that session.problem pickling error
> is not related to anything in PTProblem class.
>
> """
> def __init__(self,description,ownerid=0):
> self.uuid = uuid.uuid1()
>
> and alter the local_import statement in my previous post to look like:
>
> PTProblemClass = local_import('dummyclass',reload=True)
>
> Thanks,
> Mike
>
> On May 6, 2:07 pm, MikeEllis <michael.f.el...@gmail.com> wrote:
>
> > The class isn't really named Foo, of course, but it makes for a more
> > readable subject line.
>
> > Here's the actual ticket:
>
> > Traceback (most recent call last):
> > File "/Users/mellis/web2py/gluon/main.py", line 504, in wsgibase
> > session._try_store_on_disk(request, response)
> > File "/Users/mellis/web2py/gluon/globals.py", line 375, in
> > _try_store_on_disk
> > cPickle.dump(dict(self), response.session_file)
> > PicklingError: Can't pickle <class
> > 'applications.peertool.modules.PTProblemClass.Problem'>: it's not the
> > same object as applications.peertool.modules.PTProblemClass.Problem
>
> > And here is a simple default.py that reliably reproduces the error:
>
> > import cPickle
> > PTProblemClass = local_import('PTProblemClass',reload=True)
>
> > def mytest():
>
> > ## Create an instance of class Problem and prove that it
> > ## can be pickled.
> > problem = PTProblemClass.Problem("Just testing ...",ownerid=2)
> > filename = 'problem_' + str(problem.uuid)
> > PROBLEMFILEPATH =
> > os.path.join('applications','peertool','private')
> > f = open(os.path.join(PROBLEMFILEPATH,filename),'w')
> > cPickle.dump(problem,f)
> > f.close()
>
> > ## Assign to session.problem and show that it is
> > ## an instance of the class
> > session.problem = problem
> > assert isinstance(session.problem, PTProblemClass.Problem)
>
> > ## Return a message of comfort and cheer
> > return dict(message=T("Test completed"))
>
> > def index(): ## Unaltered from new app creation
> > """
> > example action using the internationalization operator T and flash
> > rendered by views/default/index.html or views/generic.html
> > """
> > response.flash = T('Welcome to web2py')
> > return dict(message=T('Hello World'))
>
> > I've not included the Problem class code. It's proprietary and I'm
> > reasonably convinced its not part of the problem since there are no
> > problems pickling (or unpickling) instances of it.
>
> > I can reproduce the problem by the following steps:
> > 1. Visit the index page, no ticket.
> > 2. Visit mytest, no ticket
> > 3. Visit index page again, get the ticket.
>
> > I'm running web2py 1.74.9.
>
> > Anyone know how to solve this? It's a particularly annoying because
> > once the error occurs, the entire app is hosed until I visit the site
> > page and clean the sessions and caches.
>
> > Thanks,
> > Mike
>
>
