OpenStack Study: catch_errors.py

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# 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 webob.dec

import webob.exc

from neutron.openstack.common.gettextutils import _ # noqa

from neutron.openstack.common import log as logging

from neutron.openstack.common.middleware import base

LOG = logging.getLogger(__name__)

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class CatchErrorsMiddleware(base.Middleware):

@webob.dec.wsgify

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    def __call__(self, req):

        try:

            response = req.get_response(self.application)

        except Exception:

            LOG.exception(_('An error occurred during '

                            'processing the request: %s'))

            response = webob.exc.HTTPInternalServerError()

        return response