import logging\r
from mininet.node import OVSSwitch\r
import ast\r
+import time\r
logging.basicConfig(level=logging.INFO)\r
\r
"""\r
self.port = '8080'\r
self.REST_api = 'http://{0}:{1}'.format(self.ip,self.port)\r
\r
+ self.previous_measurement = 0\r
+ self.previous_monitor_time = 0\r
\r
- def get_rate(self, vnf_name, direction='tx'):\r
+ def get_rate(self, vnf_name, direction='tx', metric='packets'):\r
+ # check if port is specified (vnf:port)\r
try:\r
+ vnf_interface = vnf_name.split(':')[1]\r
+ except:\r
+ # take first interface by default\r
+ connected_sw = self.net.DCNetwork_graph.neighbors(vnf_name)[0]\r
+ link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw]\r
+ vnf_interface = link_dict[0]['src_port_id']\r
+ # vnf_source_interface = 0\r
+\r
+ vnf_name = vnf_name.split(':')[0]\r
+ # take into account that this is a MultiGraph\r
+ #mon_port = self.net.DCNetwork_graph[vnf_name][connected_sw][0]['dst_port']\r
+\r
+ for connected_sw in self.net.DCNetwork_graph.neighbors(vnf_name):\r
+ link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw]\r
+ for link in link_dict:\r
+ # logging.info("{0},{1}".format(link_dict[link],vnf_source_interface))\r
+ if link_dict[link]['src_port_id'] == vnf_interface:\r
+ # found the right link and connected switch\r
+ # logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface))\r
+ #src_sw = connected_sw\r
+\r
+ mon_port = link_dict[link]['dst_port']\r
+ break\r
+\r
+ try:\r
+ # default port direction to monitor\r
+ if direction is None:\r
+ direction = 'tx'\r
+\r
vnf_switch = self.net.DCNetwork_graph.neighbors(str(vnf_name))\r
\r
if len(vnf_switch) > 1:\r
logging.info("vnf: {0} is not connected to switch".format(vnf_name))\r
return\r
\r
- mon_port = self.net.DCNetwork_graph[vnf_name][vnf_switch]['dst_port']\r
+\r
switch_dpid = x = int(str(next_node.dpid),16)\r
\r
+ # TODO get metric name from arg\r
+ key = '{0}_{1}'.format(direction, metric)\r
+\r
+\r
ret = self.REST_cmd('stats/port', switch_dpid)\r
port_stat_dict = ast.literal_eval(ret)\r
for port_stat in port_stat_dict[str(switch_dpid)]:\r
if port_stat['port_no'] == mon_port:\r
- return port_stat\r
- break\r
+ port_uptime = port_stat['duration_sec'] + port_stat['duration_nsec'] * 10 ** (-9)\r
+ this_measurement = port_stat[key]\r
+\r
+ if self.previous_monitor_time <= 0 or self.previous_monitor_time >= port_uptime:\r
+ self.previous_measurement = port_stat[key]\r
+ self.previous_monitor_time = port_uptime\r
+ # do first measurement\r
+ time.sleep(1)\r
+ byte_rate = self.get_rate(vnf_name,direction)\r
+ return byte_rate\r
+ else:\r
+ time_delta = (port_uptime - self.previous_monitor_time)\r
+ byte_rate = (this_measurement - self.previous_measurement) / float(time_delta)\r
+ #logging.info('uptime:{2} delta:{0} rate:{1}'.format(time_delta,byte_rate,port_uptime))\r
+ #return byte_rate\r
+\r
+ self.previous_measurement = this_measurement\r
+ self.previous_monitor_time = port_uptime\r
+ return byte_rate\r
\r
return ret\r
\r