| __author__ = 'Administrator' | |
| import urllib2 | |
| import logging | |
| from mininet.node import OVSSwitch | |
| import ast | |
| logging.basicConfig(level=logging.INFO) | |
| """ | |
| class to read openflow stats from the Ryu controller of the DCNEtwork | |
| """ | |
| class DCNetworkMonitor(): | |
| def __init__(self, net): | |
| self.net = net | |
| # link to REST_API | |
| self.ip = '0.0.0.0' | |
| self.port = '8080' | |
| self.REST_api = 'http://{0}:{1}'.format(self.ip,self.port) | |
| def get_rate(self, vnf_name, direction='tx'): | |
| try: | |
| vnf_switch = self.net.DCNetwork_graph.neighbors(str(vnf_name)) | |
| if len(vnf_switch) > 1: | |
| logging.info("vnf: {0} has multiple ports".format(vnf_name)) | |
| return | |
| elif len(vnf_switch) == 0: | |
| logging.info("vnf: {0} is not connected".format(vnf_name)) | |
| return | |
| else: | |
| vnf_switch = vnf_switch[0] | |
| next_node = self.net.getNodeByName(vnf_switch) | |
| if not isinstance( next_node, OVSSwitch ): | |
| logging.info("vnf: {0} is not connected to switch".format(vnf_name)) | |
| return | |
| mon_port = self.net.DCNetwork_graph[vnf_name][vnf_switch]['dst_port'] | |
| switch_dpid = x = int(str(next_node.dpid),16) | |
| ret = self.REST_cmd('stats/port', switch_dpid) | |
| port_stat_dict = ast.literal_eval(ret) | |
| for port_stat in port_stat_dict[str(switch_dpid)]: | |
| if port_stat['port_no'] == mon_port: | |
| return port_stat | |
| break | |
| return ret | |
| except Exception as ex: | |
| logging.exception("get_txrate error.") | |
| return ex.message | |
| def REST_cmd(self, prefix, dpid): | |
| url = self.REST_api + '/' + str(prefix) + '/' + str(dpid) | |
| req = urllib2.Request(url) | |
| ret = urllib2.urlopen(req).read() | |
| return ret |