#!/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):

    """Called when an uncaught exception is raised.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    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