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Hi there,

For my team's networking backend, we want to catch security group 
updates in our ML2 mechanism driver code.

Currently we're doing this by monkey patching the AgentNotifierApi:

     # This section monkeypatches the 
AgentNotifierApi.security_groups_rule_updated
     # method to ensure that the Calico driver gets told about security 
group
     # updates at all times. This is a deeply unpleasant hack. Please, 
do as I say,
     # not as I do.
     #
     # For more info, please see issues #635 and #641.
     original_sgr_updated = 
rpc.AgentNotifierApi.security_groups_rule_updated


     def security_groups_rule_updated(self, context, sgids):
         LOG.info("security_groups_rule_updated: %s %s" % (context, sgids))
         mech_driver.send_sg_updates(sgids, context)
         original_sgr_updated(self, context, sgids)


     rpc.AgentNotifierApi.security_groups_rule_updated = (
         security_groups_rule_updated
     )

But, as the comment says, this is a hack.  Is there a better way?

Many thanks,
	Neil