How to export RYU Stats

Question

With RYU controller, how can I export all stats (throughout the monitoring time) into csv file as time series stats using e.g., simple_monitor application?

Answer 1

I managed to export the stats by creating a new file in the _port_stats_reply_handler function:

file = open('stats.csv', 'a')

Then in the loop I added:

for stat in sorted(body, key=attrgetter('port_no')):
            file.write("\n{},{},{},{},{},{}"
            .format(ev.msg.datapath.id,
            stat.port_no, stat.rx_packets, stat.rx_dropped,
            stat.tx_packets, stat.tx_dropped))