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OpenStack Study: resource.py**** CubicPower OpenStack Study ****
# Copyright 2012 OpenStack Foundation. # 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. """ Utility methods for working with WSGI servers redux """ import sys import netaddr import six import webob.dec import webob.exc from neutron.api.v2 import attributes from neutron.common import exceptions from neutron.openstack.common import gettextutils from neutron.openstack.common import log as logging from neutron import wsgi LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class Request(wsgi.Request): pass
**** CubicPower OpenStack Study **** 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) as e: for fault in faults: if isinstance(e, fault): mapped_exc = faults[fault] break else: mapped_exc = webob.exc.HTTPInternalServerError if 400 <= mapped_exc.code < 500: LOG.info(_('%(action)s failed (client error): %(exc)s'), {'action': action, 'exc': e}) else: LOG.exception(_('%s failed'), action) e = translate(e, language) # following structure is expected by python-neutronclient err_data = {'type': e.__class__.__name__, 'message': e, 'detail': ''} body = serializer.serialize({'NeutronError': err_data}) kwargs = {'body': body, 'content_type': content_type} raise mapped_exc(**kwargs) except webob.exc.HTTPException as e: type_, value, tb = sys.exc_info() LOG.exception(_('%s failed'), action) translate(e, language) value.body = serializer.serialize({'NeutronError': 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': e.message}) kwargs = {'body': body, 'content_type': content_type} raise webob.exc.HTTPNotImplemented(**kwargs) except Exception: # NOTE(jkoelker) Everything else is 500 LOG.exception(_('%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': 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) return resource def translate(translatable, locale): """Translates the object to the given locale. If the object is an exception its translatable elements are translated in place, if the object is a translatable string it is translated and returned. Otherwise, the object is returned as-is. :param translatable: the object to be translated :param locale: the locale to translate to :returns: the translated object, or the object as-is if it was not translated """ localize = gettextutils.translate if isinstance(translatable, exceptions.NeutronException): translatable.msg = localize(translatable.msg, locale) elif isinstance(translatable, webob.exc.HTTPError): translatable.detail = localize(translatable.detail, locale) elif isinstance(translatable, Exception): translatable.message = localize(translatable.message, locale) else: return localize(translatable, locale) return translatable
**** CubicPower OpenStack Study **** def translate(translatable, locale): """Translates the object to the given locale. If the object is an exception its translatable elements are translated in place, if the object is a translatable string it is translated and returned. Otherwise, the object is returned as-is. :param translatable: the object to be translated :param locale: the locale to translate to :returns: the translated object, or the object as-is if it was not translated """ localize = gettextutils.translate if isinstance(translatable, exceptions.NeutronException): translatable.msg = localize(translatable.msg, locale) elif isinstance(translatable, webob.exc.HTTPError): translatable.detail = localize(translatable.detail, locale) elif isinstance(translatable, Exception): translatable.message = localize(translatable.message, locale) else: return localize(translatable, locale) return translatable
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