revision_documents.py 文件源码

def _retrieve_layering_policy(self):
        try:
            # NOTE(fmontei): Layering policies exist system-wide, across all
            # revisions, so no need to filter by revision.
            layering_policy_filters = {
                'deleted': False,
                'schema': types.LAYERING_POLICY_SCHEMA
            }
            layering_policy = db_api.document_get(**layering_policy_filters)
        except errors.DocumentNotFound as e:
            error_msg = (
                'No layering policy found in the system so could not render '
                'the documents.')
            LOG.error(error_msg)
            LOG.exception(six.text_type(e))
            raise falcon.HTTPConflict(description=error_msg)
        else:
            return layering_policy