Python脚本实现网卡流量监控

#/usr/bin/env/python
#coding=utf-8

import sys,re,time,os
maxdata = 50000 #单位KB
memfilename = '/tmp/newnetcardtransdata.txt'
netcard = '/proc/net/dev'

def checkfile(filename):
 if os.path.isfile(filename):
 pass
 else:
 f = open(filename, 'w')
 f.write('0')
 f.close()

def get_net_data():
 nc = netcard or '/proc/net/dev'
 fd = open(nc, "r")
 netcardstatus = False
 for line in fd.readlines():
 if line.find("eth0") > 0:
 netcardstatus = True
 field = line.split()
 recv = field[0].split(":")[1]
 recv = recv or field[1]
 send = field[8]
 if not netcardstatus:
 fd.close()
 print 'Please setup your netcard'
 sys.exit()
 fd.close()
 return (float(recv), float(send))

def monfirst(filename):
 nowtime = time.strftime('%m-%d %H:%M',time.localtime(time.time()))
 sec = time.localtime().tm_sec
 if nowtime == '01-01 00:00':
 if sec < 10:
 f = open(filename, 'w')
 f.write('0')
 f.close() 

def net_loop():
 (recv, send) = get_net_data()
 checkfile(memfilename)
 monfirst(memfilename)
 lasttransdaraopen = open(memfilename,'r')
 lasttransdata = lasttransdaraopen.readline()
 lasttransdaraopen.close()
 totaltrans = int(lasttransdata) or 0
 while True:
 time.sleep(3)
 (new_recv, new_send) = get_net_data()
 recvdata = (new_recv - recv) / 1024
 senddata = (new_send - send) / 1024
 totaltrans += int(recvdata)
 totaltrans += int(senddata)
 memw = open(memfilename,'w')
 memw.write(str(totaltrans))
 memw.close()
 if totaltrans >= maxdata:
 os.system('init 0')

if __name__ == "__main__":
 net_loop()