49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Simple middleware for safely catching unexpected exceptions."""
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# NOTE(cdent): This is a super simplified replacement for the nova
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# FaultWrapper, which does more than placement needs.
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from oslo_log import log as logging
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import six
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from webob import exc
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from nova.api.openstack.placement import util
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LOG = logging.getLogger(__name__)
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class FaultWrapper(object):
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"""Turn an uncaught exception into a status 500.
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Uncaught exceptions usually shouldn't happen, if it does it
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means there is a bug in the placement service, which should be
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fixed.
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"""
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def __init__(self, application):
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self.application = application
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def __call__(self, environ, start_response):
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try:
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return self.application(environ, start_response)
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except Exception as unexpected_exception:
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LOG.exception('Placement API unexpected error: %s',
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unexpected_exception)
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formatted_exception = exc.HTTPInternalServerError(
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six.text_type(unexpected_exception))
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formatted_exception.json_formatter = util.json_error_formatter
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return formatted_exception.generate_response(
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environ, start_response)
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