120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
# 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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"""
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A middleware that turns exceptions into parsable string.
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"""
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from oslo_utils import reflection
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import webob
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from senlin.api.common import serializers
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from senlin.api.common import wsgi
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from senlin.common import exception
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class Fault(object):
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def __init__(self, error):
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self.error = error
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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serializer = serializers.JSONResponseSerializer()
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resp = webob.Response(request=req)
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default_webob_exc = webob.exc.HTTPInternalServerError()
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resp.status_code = self.error.get('code', default_webob_exc.code)
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serializer.default(resp, self.error)
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return resp
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class FaultWrapper(wsgi.Middleware):
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"""Replace error body with something the client can parse."""
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error_map = {
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'ActionConflict': webob.exc.HTTPConflict,
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'ActionCooldown': webob.exc.HTTPConflict,
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'ActionInProgress': webob.exc.HTTPConflict,
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'ActionImmutable': webob.exc.HTTPConflict,
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'BadRequest': webob.exc.HTTPBadRequest,
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'FeatureNotSupported': webob.exc.HTTPConflict,
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'Forbidden': webob.exc.HTTPForbidden,
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'InternalError': webob.exc.HTTPInternalServerError,
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'InvalidGlobalAPIVersion': webob.exc.HTTPNotAcceptable,
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'InvalidSpec': webob.exc.HTTPBadRequest,
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'MethodVersionNotFound': webob.exc.HTTPBadRequest,
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'MultipleChoices': webob.exc.HTTPBadRequest,
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'NodeNotOrphan': webob.exc.HTTPConflict,
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'PolicyBindingNotFound': webob.exc.HTTPNotFound,
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'ProfileOperationFailed': webob.exc.HTTPInternalServerError,
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'RequestLimitExceeded': webob.exc.HTTPBadRequest,
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'ResourceInUse': webob.exc.HTTPConflict,
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'ResourceIsLocked': webob.exc.HTTPConflict,
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'ResourceNotFound': webob.exc.HTTPNotFound,
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}
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def _map_exception_to_error(self, class_exception):
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if class_exception == Exception:
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return webob.exc.HTTPInternalServerError
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if class_exception.__name__ not in self.error_map:
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return self._map_exception_to_error(class_exception.__base__)
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return self.error_map[class_exception.__name__]
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def _error(self, ex):
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traceback_marker = 'Traceback (most recent call last)'
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webob_exc = None
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if isinstance(ex, exception.HTTPExceptionDisguise):
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ex = ex.exc
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webob_exc = ex
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ex_type = reflection.get_class_name(ex, fully_qualified=False)
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is_remote = ex_type.endswith('_Remote')
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if is_remote:
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ex_type = ex_type[:-len('_Remote')]
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full_message = str(ex)
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if '\n' in full_message and is_remote:
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message = full_message.split('\n', 1)[0]
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elif traceback_marker in full_message:
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message = full_message.split(traceback_marker, 1)[0]
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message = message.rstrip('\n')
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else:
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message = full_message
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if isinstance(ex, exception.SenlinException):
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message = ex.message
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if not webob_exc:
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webob_exc = self._map_exception_to_error(ex.__class__)
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error = {
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'code': webob_exc.code,
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'title': webob_exc.title,
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'explanation': webob_exc.explanation,
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'error': {
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'code': webob_exc.code,
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'message': message,
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'type': ex_type,
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}
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}
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return error
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def process_request(self, req):
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try:
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return req.get_response(self.application)
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except Exception as exc:
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return req.get_response(Fault(self._error(exc)))
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