Hi:
I don't like the idea of ResourceDriver and AgentDriver. I suggested
use a singleton worker thread to manager all underlying setup, so the
driver should do nothing other than fire a update event to the worker.
The worker thread may looks like this one:
# the only variable store all local state which survives between
different events, including lvm, fdb or whatever
state = {}
# loop forever
while True:
event = ev_queue.pop()
if not event:
sleep() # may be interrupted when new event comes
continue
origin_state = state
new_state = event.merge_state(state)
if event.is_ovsdb_changed():
if event.is_tunnel_changed():
setup_tunnel(new_state, old_state, event)
if event.is_port_tags_changed():
setup_port_tags(new_state, old_state, event)
if event.is_flow_changed():
if event.is_flow_table_1_changed():
setup_flow_table_1(new_state, old_state, event)
if event.is_flow_table_2_changed():
setup_flow_table_2(new_state, old_state, event)
if event.is_flow_table_3_changed():
setup_flow_table_3(new_state, old_state, event)
if event.is_flow_table_4_changed():
setup_flow_table_4(new_state, old_state, event)
if event.is_iptable_changed():
if event.is_iptable_nat_changed():
setup_iptable_nat(new_state, old_state, event)
if event.is_iptable_filter_changed():
setup_iptable_filter(new_state, old_state, event)
state = new_state
when any part has been changed by a event, the corresponding setup_xxx
function rebuild the whole part, then use the restore like
`iptables-restore` or `ovs-ofctl replace-flows` to reset the whole
part.
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