code: def get_firewall_rules(self, server):
          
          server_uuid, server_instance = uuid_and_instance(server)
  
          url = '/server/{0}/firewall_rule'.format(server_uuid)
          res = self.get_request(url)
  
          return [
              FirewallRule(server=server_instance, **firewall_rule)
              for firewall_rule in res['firewall_rules']['firewall_rule']
          ]
docs: Return all FirewallRule objects based on a server instance or uuid.