Hi,
How can I get a notification that a flow has been deleted? i am using the
attached code for realizing when a specific flow entry was deleted and then
measuring the flow setup time, but there is no EventOFPFlowRemoved event
that i can catch it. why? would you please help me to fix it?
this is the code:
def _measure_flow_setup_time(self):
while True:
for dp in self.datapaths.values():
if dp.id == 1:
ofp = dp.ofproto
ofp_parser = dp.ofproto_parser
match = ofp_parser.OFPMatch(ipv4_src='10.10.10.100')
actions = [ofp_parser.OFPActionOutput(ofp.OFPP_NORMAL,
0)]
inst =
[ofp_parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions)]
req_add = ofp_parser.OFPFlowMod(dp,
command=ofp.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
flags=ofp.OFPFF_SEND_FLOW_REM,
priority=0, out_port=2,
out_group=1, match=match, instructions=inst)
dp.send_msg(req_add)
hub.sleep(1)
req_del = ofp_parser.OFPFlowMod(dp,
command=ofp.OFPFC_DELETE_STRICT, idle_timeout=0, hard_timeout=0,
flags=ofp.OFPFF_SEND_FLOW_REM,
priority=0, out_port=2,
out_group=1, match=match, instructions=inst)
dp.send_msg(req_del)
self.flow_del_send_time = time.time()
self.k += 1
hub.sleep(1)
@set_ev_cls(ofp_event.EventOFPFlowRemoved, MAIN_DISPATCHER)
def flow_removed_handler(self, ev):
print "flow_removed_handler"
msg = ev.msg
dp = msg.datapath
ofp = dp.ofproto
if dp.id == 1:
if msg.reason == ofp.OFPRR_IDLE_TIMEOUT:
reason = 'IDLE TIMEOUT'
elif msg.reason == ofp.OFPRR_HARD_TIMEOUT:
reason = 'HARD TIMEOUT'
elif msg.reason == ofp.OFPRR_DELETE:
reason = 'DELETE'
self.flow_removed_receive_time = time.time()
self.f4.write(str(self.k)+'\t'+str(((self.flow_removed_receive_time -
self.flow_del_send_time) + self.execution_time)*1000)+'\n')
elif msg.reason == ofp.OFPRR_GROUP_DELETE:
reason = 'GROUP DELETE'
else:
reason = 'unknown'
print reason
Thank you,
...................................................
mehran shetabi
PhD student
Computer Engineering Department
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