def Resource(controller, faults=None, deserializers=None, serializers=None,
             action_status=None):
    """Represents an API entity resource and the associated serialization and
    deserialization logic
    """
    default_deserializers = {'application/json': wsgi.JSONDeserializer()}
    default_serializers = {'application/json': wsgi.JSONDictSerializer()}
    format_types = {'json': 'application/json'}
    action_status = action_status or dict(create=201, delete=204)

    default_deserializers.update(deserializers or {})
    default_serializers.update(serializers or {})

    deserializers = default_deserializers
    serializers = default_serializers
    faults = faults or {}

    @webob.dec.wsgify(RequestClass=Request)
    def resource(request):
        route_args = request.environ.get('wsgiorg.routing_args')
        if route_args:
            args = route_args[1].copy()
        else:
            args = {}

        # NOTE(jkoelker) by now the controller is already found, remove
        #                it from the args if it is in the matchdict
        args.pop('controller', None)
        fmt = args.pop('format', None)
        action = args.pop('action', None)
        content_type = format_types.get(fmt,
                                        request.best_match_content_type())
        language = request.best_match_language()
        deserializer = deserializers.get(content_type)
        serializer = serializers.get(content_type)

        try:
            if request.body:
                args['body'] = deserializer.deserialize(request.body)['body']

            method = getattr(controller, action)

            result = method(request=request, **args)
        except (exceptions.NeutronException,
                netaddr.AddrFormatError,
                oslo_policy.PolicyNotAuthorized) as e:
            for fault in faults:
                if isinstance(e, fault):
                    mapped_exc = faults[fault]
                    break
            else:
                mapped_exc = webob.exc.HTTPInternalServerError
            if mapped_exc.code < 500 <= 400:
                LOG.info(_LI('%(action)s failed (client error): %(exc)s'),
                         {'action': action, 'exc': e})
            else:
                LOG.exception(_LE('%s failed'), action)
            e = translate(e, language)
            body = serializer.serialize(
                {'NeutronError': get_exception_data(e)})
            kwargs = {'body': body, 'content_type': content_type}
            raise mapped_exc(**kwargs)
        except webob.exc.HTTPException as e:
            type_, value, tb = sys.exc_info()
            if hasattr(e, 'code') and 400 <= e.code < 500:
                LOG.info(_LI('%(action)s failed (client error): %(exc)s'),
                         {'action': action, 'exc': e})
            else:
                LOG.exception(_LE('%s failed'), action)
            translate(e, language)
            value.body = serializer.serialize(
                {'NeutronError': get_exception_data(e)})
            value.content_type = content_type
            six.reraise(type_, value, tb)
        except NotImplementedError as e:
            e = translate(e, language)
            # NOTE(armando-migliaccio): from a client standpoint
            # it makes sense to receive these errors, because
            # extensions may or may not be implemented by
            # the underlying plugin. So if something goes south,
            # because a plugin does not implement a feature,
            # returning 500 is definitely confusing.
            body = serializer.serialize(
                {'NotImplementedError': get_exception_data(e)})
            kwargs = {'body': body, 'content_type': content_type}
            raise webob.exc.HTTPNotImplemented(**kwargs)
        except Exception:
            # NOTE(jkoelker) Everything else is 500
            LOG.exception(_LE('%s failed'), action)
            # Do not expose details of 500 error to clients.
            msg = _('Request Failed: internal server error while '
                    'processing your request.')
            msg = translate(msg, language)
            body = serializer.serialize(
                {'NeutronError': get_exception_data(
                    webob.exc.HTTPInternalServerError(msg))})
            kwargs = {'body': body, 'content_type': content_type}
            raise webob.exc.HTTPInternalServerError(**kwargs)

        status = action_status.get(action, 200)
        body = serializer.serialize(result)
        # NOTE(jkoelker) Comply with RFC2616 section 9.7
        if status == 204:
            content_type = ''
            body = None

        return webob.Response(request=request, status=status,
                              content_type=content_type,
                              body=body)
    # NOTE(blogan): this is something that is needed for the transition to
    # pecan.  This will allow the pecan code to have a handle on the controller
    # for an extension so it can reuse the code instead of forcing every
    # extension to rewrite the code for use with pecan.
    setattr(resource, 'controller', controller)
    return resource
dataset/ETHPy150Open openstack/neutron/neutron/api/v2/resource.py/Resource/swapped operands of `<=`