80 lines
2.9 KiB
Python
80 lines
2.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import webob.dec
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import webob.exc
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from cinder.api.openstack import wsgi
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from cinder import exception
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from cinder.openstack.common import log as logging
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from cinder import utils
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from cinder import wsgi as base_wsgi
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LOG = logging.getLogger(__name__)
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class FaultWrapper(base_wsgi.Middleware):
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"""Calls down the middleware stack, making exceptions into faults."""
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_status_to_type = {}
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@staticmethod
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def status_to_type(status):
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if not FaultWrapper._status_to_type:
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for clazz in utils.walk_class_hierarchy(webob.exc.HTTPError):
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FaultWrapper._status_to_type[clazz.code] = clazz
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return FaultWrapper._status_to_type.get(
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status, webob.exc.HTTPInternalServerError)()
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def _error(self, inner, req):
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LOG.exception(_("Caught error: %s"), unicode(inner))
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safe = getattr(inner, 'safe', False)
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headers = getattr(inner, 'headers', None)
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status = getattr(inner, 'code', 500)
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if status is None:
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status = 500
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msg_dict = dict(url=req.url, status=status)
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LOG.info(_("%(url)s returned with HTTP %(status)d") % msg_dict)
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outer = self.status_to_type(status)
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if headers:
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outer.headers = headers
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# NOTE(johannes): We leave the explanation empty here on
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# purpose. It could possibly have sensitive information
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# that should not be returned back to the user. See
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# bugs 868360 and 874472
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# NOTE(eglynn): However, it would be over-conservative and
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# inconsistent with the EC2 API to hide every exception,
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# including those that are safe to expose, see bug 1021373
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if safe:
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msg = (inner.msg if isinstance(inner, exception.CinderException)
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else unicode(inner))
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params = {'exception': inner.__class__.__name__,
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'explanation': msg}
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outer.explanation = _('%(exception)s: %(explanation)s') % params
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return wsgi.Fault(outer)
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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try:
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return req.get_response(self.application)
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except Exception as ex:
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return self._error(ex, req)
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