def user_name(self):
	if self.user_id is None:
		return None

	from ext_cloud.OpenStack.OpenStackIdentity.OpenStackIdentity import OpenStackIdentitycls
        identity = OpenStackIdentitycls(**self._credentials)
        users = identity.list_users_cache()
        return users[self.user_id]['name'] if self.user_id in users else None
    def tenant_name(self):
	from ext_cloud.OpenStack.OpenStackIdentity.OpenStackIdentity import OpenStackIdentitycls
        identity = OpenStackIdentitycls(**self._credentials)
        tenants = identity.list_tenants_cache()
        return tenants[self.tenant_id]['name'] if self.tenant_id in tenants else None