I'm sure this is my fault, but hoping someone has helpful suggestions. have
figured out that my weird issue happens when two requests hit the paster
server serving my app too quickly. When I put a breakpoint in my javascript
debugger, and manually separate the ajax requests in time, I don't have an
issue. When the two come in quickly, my logging from my bfg app shows that
they are overlapping, ie, I get beginning of the method statements from both
before end of the method statements from either. In that circumstance I then
get the internal server error from bfg and the traceback that I will post
below. I've got a really bad feeling that this means my attempt to make an
SQLAlchemy abstract model that gets created on each request is using some
thread shared code or something in SA and hitting problems. I'm wondering if
anyone has encountered anything like this before or would know what to look
for at a glance at this traceback. Ugh! =(
thanks
Iain
(you can see the interleaved logging statements in the below too,)
21:16:59,778 INFO [irmacs.views.bookings] BookingView.__init__()
21:16:59,779 INFO [irmacs.views.bookings] BookingView.by_date() date:
2010-08-18
21:16:59,851 INFO [irmacs.views.bookings] BookingView.__init__()
21:16:59,852 INFO [irmacs.views.bookings] BookingView.by_date() date:
2009-12-18
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 52483)
Traceback (most recent call last):
File
"/home/irmacs/irmacs_trunk/eggs/Paste-1.7.4-py2.6.egg/paste/httpserver.py",
line 1068, in process_request_in_thread
21:16:59,881 INFO [irmacs.views.bookings] - returning json of: []
self.finish_request(request, client_address)
File "/usr/lib/python2.6/SocketServer.py", line 320, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.6/SocketServer.py", line 615, in __init__
self.handle()
File
"/home/irmacs/irmacs_trunk/eggs/Paste-1.7.4-py2.6.egg/paste/httpserver.py",
line 442, in handle
BaseHTTPRequestHandler.handle(self)
File "/usr/lib/python2.6/BaseHTTPServer.py", line 329, in handle
self.handle_one_request()
File
"/home/irmacs/irmacs_trunk/eggs/Paste-1.7.4-py2.6.egg/paste/httpserver.py",
line 437, in handle_one_request
self.wsgi_execute()
File
"/home/irmacs/irmacs_trunk/eggs/Paste-1.7.4-py2.6.egg/paste/httpserver.py",
line 287, in wsgi_execute
self.wsgi_start_response)
File
"/home/irmacs/irmacs_trunk/eggs/repoze.who-1.0.18-py2.6.egg/repoze/who/middleware.py",
line 107, in __call__
app_iter = app(environ, wrapper.wrap_start_response)
File
"/home/irmacs/irmacs_trunk/eggs/repoze.bfg-1.2.1-py2.6.egg/repoze/bfg/router.py",
line 130, in __call__
response = view_callable(context, request)
File
"/home/irmacs/irmacs_trunk/eggs/repoze.bfg-1.2.1-py2.6.egg/repoze/bfg/configuration.py",
line 1665, in _bfg_class_view
response = getattr(inst, attr)()
File "/home/irmacs/irmacs_trunk/Irmacs/irmacs/views/bookings.py", line 48,
in by_date
bookings = self.model.list( Booking, {'date':isodate} )
File
"/home/irmacs/irmacs_trunk/framework_src/xornot.model/xornot/model/__init__.py",
line 208, in list
items = query.all()
File
"/home/irmacs/irmacs_trunk/eggs/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py",
line 1267, in all
return list(self)
File
"/home/irmacs/irmacs_trunk/eggs/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py",
line 1422, in instances
rows = [process[0](context, row) for row in fetch]
File
"/home/irmacs/irmacs_trunk/eggs/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py",
line 2032, in main
return _instance(row, None)
File
"/home/irmacs/irmacs_trunk/eggs/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py",
line 1751, in _instance
state._run_on_load(instance)
File
"/home/irmacs/irmacs_trunk/eggs/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/state.py",
line 119, in _run_on_load
self.manager.events.run('on_load', instance)
AttributeError: 'NoneType' object has no attribute 'run'
----------------------------------------
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