src/emuvim/dcemulator/monitoring.py

   1 __author__ = 'Administrator'
   2
   3 import urllib2
   4 import logging
   5 from mininet.node import  OVSSwitch
   6 import ast
   7 import time
   8 logging.basicConfig(level=logging.INFO)
   9
  10 """
  11 class to read openflow stats from the Ryu controller of the DCNEtwork
  12 """
  13
  14 class DCNetworkMonitor():
  15     def __init__(self, net):
  16         self.net = net
  17         # link to REST_API
  18         self.ip = '0.0.0.0'
  19         self.port = '8080'
  20         self.REST_api = 'http://{0}:{1}'.format(self.ip,self.port)
  21
  22         self.previous_measurement = 0
  23         self.previous_monitor_time = 0
  24
  25     def get_rate(self, vnf_name, direction='tx', metric='packets'):
  26         # check if port is specified (vnf:port)
  27         try:
  28             vnf_interface = vnf_name.split(':')[1]
  29         except:
  30             # take first interface by default
  31             connected_sw = self.net.DCNetwork_graph.neighbors(vnf_name)[0]
  32             link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw]
  33             vnf_interface = link_dict[0]['src_port_id']
  34             # vnf_source_interface = 0
  35
  36         vnf_name = vnf_name.split(':')[0]
  37         # take into account that this is a MultiGraph
  38         #mon_port = self.net.DCNetwork_graph[vnf_name][connected_sw][0]['dst_port']
  39
  40         for connected_sw in self.net.DCNetwork_graph.neighbors(vnf_name):
  41             link_dict = self.net.DCNetwork_graph[vnf_name][connected_sw]
  42             for link in link_dict:
  43                 # logging.info("{0},{1}".format(link_dict[link],vnf_source_interface))
  44                 if link_dict[link]['src_port_id'] == vnf_interface:
  45                     # found the right link and connected switch
  46                     # logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface))
  47                     #src_sw = connected_sw
  48
  49                     mon_port = link_dict[link]['dst_port']
  50                     break
  51
  52         try:
  53             # default port direction to monitor
  54             if direction is None:
  55                 direction = 'tx'
  56
  57             vnf_switch = self.net.DCNetwork_graph.neighbors(str(vnf_name))
  58
  59             if len(vnf_switch) > 1:
  60                 logging.info("vnf: {0} has multiple ports".format(vnf_name))
  61                 return
  62             elif len(vnf_switch) == 0:
  63                 logging.info("vnf: {0} is not connected".format(vnf_name))
  64                 return
  65             else:
  66                 vnf_switch = vnf_switch[0]
  67             next_node = self.net.getNodeByName(vnf_switch)
  68
  69             if not isinstance( next_node, OVSSwitch ):
  70                 logging.info("vnf: {0} is not connected to switch".format(vnf_name))
  71                 return
  72
  73
  74             switch_dpid = x = int(str(next_node.dpid),16)
  75
  76             # TODO get metric name from arg
  77             key = '{0}_{1}'.format(direction, metric)
  78
  79
  80             ret = self.REST_cmd('stats/port', switch_dpid)
  81             port_stat_dict = ast.literal_eval(ret)
  82             for port_stat in port_stat_dict[str(switch_dpid)]:
  83                 if port_stat['port_no'] == mon_port:
  84                     port_uptime = port_stat['duration_sec'] + port_stat['duration_nsec'] * 10 ** (-9)
  85                     this_measurement = port_stat[key]
  86
  87                     if self.previous_monitor_time <= 0 or self.previous_monitor_time >= port_uptime:
  88                         self.previous_measurement = port_stat[key]
  89                         self.previous_monitor_time = port_uptime
  90                         # do first measurement
  91                         time.sleep(1)
  92                         byte_rate = self.get_rate(vnf_name,direction)
  93                         return byte_rate
  94                     else:
  95                         time_delta = (port_uptime - self.previous_monitor_time)
  96                         byte_rate = (this_measurement - self.previous_measurement) / float(time_delta)
  97                         #logging.info('uptime:{2} delta:{0} rate:{1}'.format(time_delta,byte_rate,port_uptime))
  98                         #return byte_rate
  99
 100                     self.previous_measurement = this_measurement
 101                     self.previous_monitor_time = port_uptime
 102                     return byte_rate
 103
 104             return ret
 105
 106         except Exception as ex:
 107             logging.exception("get_txrate error.")
 108             return ex.message
 109
 110
 111
 112     def REST_cmd(self, prefix, dpid):
 113         url = self.REST_api + '/' + str(prefix) + '/' + str(dpid)
 114         req = urllib2.Request(url)
 115         ret = urllib2.urlopen(req).read()
 116         return ret