/usr/share/pyshared/storm/django/middleware.py is in python-storm 0.19-1.
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# Copyright (c) 2008 Canonical
#
# Written by James Henstridge <jamesh@canonical.com>
#
# This file is part of Storm Object Relational Mapper.
#
# Storm is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of
# the License, or (at your option) any later version.
#
# Storm is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""Django middleware support for the Zope transaction manager.
Adding storm.django.middleware.ZopeTransactionMiddleware to
L{MIDDLEWARE_CLASSES} in the application's settings module will cause a
Zope transaction to be run for each request.
"""
__all__ = ['ZopeTransactionMiddleware']
from django.conf import settings
import transaction
class ZopeTransactionMiddleware(object):
"""Zope Transaction middleware for Django.
If this is enabled, a Zope transaction will be run to cover each
request.
"""
def __init__(self):
self.commit_safe_methods = getattr(
settings, 'STORM_COMMIT_SAFE_METHODS', True)
def process_request(self, request):
"""Begin a transaction on request start.."""
from django.db import transaction as django_transaction
django_transaction.enter_transaction_management()
django_transaction.managed(True)
transaction.begin()
def process_exception(self, request, exception):
"""Abort the transaction on errors."""
from django.db import transaction as django_transaction
transaction.abort()
django_transaction.set_clean()
django_transaction.leave_transaction_management()
def process_response(self, request, response):
"""Commit or abort the transaction after processing the response.
On successful completion of the request, the transaction will
be committed.
As an exception to this, if the L{STORM_COMMIT_SAFE_METHODS}
setting is False, and the request used either of the GET and
HEAD methods, the transaction will be aborted.
"""
from django.db import transaction as django_transaction
# If process_exception() has been called, then we'll no longer
# be in managed transaction mode.
if django_transaction.is_managed():
if self.commit_safe_methods or (
request.method not in ['HEAD', 'GET']):
transaction.commit()
else:
transaction.abort()
django_transaction.set_clean()
django_transaction.leave_transaction_management()
return response
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