--- /dev/null
+__author__ = 'Administrator'\r
+\r
+import urllib2\r
+import logging\r
+from mininet.node import OVSSwitch\r
+import ast\r
+logging.basicConfig(level=logging.INFO)\r
+\r
+"""\r
+class to read openflow stats from the Ryu controller of the DCNEtwork\r
+"""\r
+\r
+class DCNetworkMonitor():\r
+ def __init__(self, net):\r
+ self.net = net\r
+ # link to REST_API\r
+ self.ip = '0.0.0.0'\r
+ self.port = '8080'\r
+ self.REST_api = 'http://{0}:{1}'.format(self.ip,self.port)\r
+\r
+\r
+ def get_rate(self, vnf_name, direction='tx'):\r
+ try:\r
+ vnf_switch = self.net.DCNetwork_graph.neighbors(str(vnf_name))\r
+\r
+ if len(vnf_switch) > 1:\r
+ logging.info("vnf: {0} has multiple ports".format(vnf_name))\r
+ return\r
+ elif len(vnf_switch) == 0:\r
+ logging.info("vnf: {0} is not connected".format(vnf_name))\r
+ return\r
+ else:\r
+ vnf_switch = vnf_switch[0]\r
+ next_node = self.net.getNodeByName(vnf_switch)\r
+\r
+ if not isinstance( next_node, OVSSwitch ):\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
+ switch_dpid = x = int(str(next_node.dpid),16)\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
+\r
+ return ret\r
+\r
+ except Exception as ex:\r
+ logging.exception("get_txrate error.")\r
+ return ex.message\r
+\r
+\r
+\r
+ def REST_cmd(self, prefix, dpid):\r
+ url = self.REST_api + '/' + str(prefix) + '/' + str(dpid)\r
+ req = urllib2.Request(url)\r
+ ret = urllib2.urlopen(req).read()\r
+ return ret
\ No newline at end of file