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OpenStack Study: fault.py**** CubicPower OpenStack Study ****
# Copyright 2010 United States Government as represented by the # Administrator of the National Aeronautics and Space Administration. # 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. import webob.dec import webob.exc from cinder.api.openstack import wsgi from cinder import exception from cinder.openstack.common import log as logging from cinder import utils from cinder import wsgi as base_wsgi LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class FaultWrapper(base_wsgi.Middleware): """Calls down the middleware stack, making exceptions into faults.""" _status_to_type = {} @staticmethod
**** CubicPower OpenStack Study **** def status_to_type(status): if not FaultWrapper._status_to_type: for clazz in utils.walk_class_hierarchy(webob.exc.HTTPError): FaultWrapper._status_to_type[clazz.code] = clazz return FaultWrapper._status_to_type.get( status, webob.exc.HTTPInternalServerError)()
**** CubicPower OpenStack Study **** def _error(self, inner, req): LOG.exception(_("Caught error: %s"), unicode(inner)) safe = getattr(inner, 'safe', False) headers = getattr(inner, 'headers', None) status = getattr(inner, 'code', 500) if status is None: status = 500 msg_dict = dict(url=req.url, status=status) LOG.info(_("%(url)s returned with HTTP %(status)d") % msg_dict) outer = self.status_to_type(status) if headers: outer.headers = headers # NOTE(johannes): We leave the explanation empty here on # purpose. It could possibly have sensitive information # that should not be returned back to the user. See # bugs 868360 and 874472 # NOTE(eglynn): However, it would be over-conservative and # inconsistent with the EC2 API to hide every exception, # including those that are safe to expose, see bug 1021373 if safe: msg = (inner.msg if isinstance(inner, exception.CinderException) else unicode(inner)) params = {'exception': inner.__class__.__name__, 'explanation': msg} outer.explanation = _('%(exception)s: %(explanation)s') % params return wsgi.Fault(outer) @webob.dec.wsgify(RequestClass=wsgi.Request)
**** CubicPower OpenStack Study **** def __call__(self, req): try: return req.get_response(self.application) except Exception as ex: return self._error(ex, req)
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