# Copyright (c) 2013 NEC Corporation
# All Rights Reserved.
#
#    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 that provides high-level error handling.

It catches all exceptions from subsequent applications in WSGI pipeline
to hide internal errors from API response.
"""
import logging

import webob.dec
import webob.exc

from oslo.middleware import base
from oslo.middleware.openstack.common.gettextutils import _LE


LOG = logging.getLogger(__name__)


class CatchErrorsMiddleware(base.Middleware):

    @webob.dec.wsgify
    def __call__(self, req):
        try:
            response = req.get_response(self.application)
        except Exception:
            LOG.exception(_LE('An error occurred during '
                              'processing the request: %s'))
            response = webob.exc.HTTPInternalServerError()
        return response