new_contents: #!/usr/bin/python2.5
  #
  # Copyright 2009 the Melange authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Middleware to handle exceptions.
  """
  
  __authors__ = [
    '"Sverre Rabbelier" <sverre@rabbelier.nl>',
    ]
  
  
  import logging
  
  from google.appengine.runtime import DeadlineExceededError
  from google.appengine.runtime.apiproxy_errors import CapabilityDisabledError
  
  from django import http
  
  from soc.views.helper import responses
  from soc.views import out_of_band
  
  
  class ExceptionHandlerMiddleware(object):
    """Middleware class to handle exceptions..
    """
  
    def process_exception(self, request, exception):
      template = None
      context = responses.getUniversalContext(request)
  
      if isinstance(exception, DeadlineExceededError):
        template = 'soc/deadline_exceeded.html'
      if isinstance(exception, MemoryError):
        template = 'soc/memory_error.html'
      if isinstance(exception, AssertionError):
        template = 'soc/assertion_error.html'
      if isinstance(exception, out_of_band.Error):
        return responses.errorResponse(error, request)
  
      if template:
        logging.exception(exception)
        return responses.respond(request, template, context=context)
  
      # let Django handle it
      return None
  
subject: Add ExceptionHandlerMiddleware