hello everybody
i am working with pox as my controller for mininet topology. in my pox cod
in the def _handle_PacketIn, i call function for send port_stats_request, 2
times within 5 minutes. also i writhed def
_handle_portstats_received(event) , for handle portsatsrecieved event, so
that , i call this function as
core.openflow.addListenerByName("PortStatsReceived",
_handle_portstats_received) in the def launch (). in the def
_handle_portstats_received(event) , i open a text file (with
open('Portstats.txt', 'a') as f) and i save info to it, then i want use the
this text file( with open('Portstats.txt', 'r') as f) in the def
_handle_PacketIn,But I am faced with a problem. when i run this command
(with open('Portstats.txt', 'r') as f) i have one error: This directory
does not exist. after this error, def _handle_portstats_received(event)
create portstats.txt, now my question is , how i can write a bet before
this command(with open('Portstats.txt', 'r') as f) , that, when this text
created , then run this command?
def _handle_PacketIn(event):
send request for port stats 2 time within 5 minc
*?????? i want to write a bet here*
with open('Portstats.txt', 'r') as f:
# do somthing
def _handle_portstats_received(event):
with open('Portstats.txt', 'a') as f:
# do somthing
def launch ():
core.openflow.addListenerByName("PortStatsReceived",
_handle_portstats_received)
please help me for solve this problem, thanks
