- # call this function repeatedly for streaming measurements\r
- def get_rate(self, vnf_name, vnf_interface=None, direction='tx', metric='packets'):\r
-\r
- key = self.metric_key\r
-\r
- ret = self.REST_cmd('stats/port', self.switch_dpid)\r
- port_stat_dict = ast.literal_eval(ret)\r
- for port_stat in port_stat_dict[str(self.switch_dpid)]:\r
- if port_stat['port_no'] == self.mon_port:\r
- port_uptime = port_stat['duration_sec'] + port_stat['duration_nsec'] * 10 ** (-9)\r
- this_measurement = int(port_stat[key])\r
- #logging.info('packets:{0}'.format(this_measurement))\r
-\r
- # set prometheus metrics\r
- if metric == 'packets':\r
- self.prom_tx_packet_count.labels(self.vnf_name, self.vnf_interface).set(this_measurement)\r
- elif metric == 'bytes':\r
- self.prom_tx_byte_count.labels(self.vnf_name, self.vnf_interface).set(this_measurement)\r
-\r
- if self.previous_monitor_time <= 0 or self.previous_monitor_time >= port_uptime:\r
- self.previous_measurement = int(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, vnf_interface, direction, metric)\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
-\r
- self.previous_measurement = this_measurement\r
- self.previous_monitor_time = port_uptime\r
- return byte_rate\r
-\r
- return ret\r
-\r