需求：因nginx做了防刷机制之后， error.log 会出现ip刷服务器，也被nginx挡掉了，并没有具体刷到后端服务器，但error.log多次出现ip，现计划把出现5次以上的ip写入黑名单。

nginx log日志格式：

2016/09/05 01:11:07 [info] 1354#0: *11981355139 limiting connections by zone "limit", client: 111.164.58.3, server: api.test.cn, request: "GET /test/test?_at=28&_av=103&_avn=1.1.2&_c=%E4%B8%8A%E6%B5%B7&_i=a4fe3bb262c171054f7ca01d8af58337&_la=0&_lo=0&_pm=iPhone&_pv=9.33.2&_pvt=2&_s=2&_sg=FF4C1556E48DBDD8A2&_sh=1136&_sw=6540&_uuid=a4fe3bb262c171054f7c55a01d8af58337&m=2791763&mid=48&pi=1&ps=10&t=1&t2=6Af95DlK55RkmekO-7W8HiTQZysThxEVOE HTTP/1.0", host: "api.test.cn"

写入黑名单文件：

[root@ ~]# more /mnt/nginx/conf/refuseip.conf 

deny 111.164.58.3;

注：以上日志格式正确，ip和链接有篡改过，无法直接访问。

#!/usr/bin/python

# -*- coding:UTF-8 -*-

import subprocess

import os

IP = ("tail -f /mnt/log/nginx/error.log")

file="/mnt/nginx/conf/refuseip.conf"

child= subprocess.Popen(IP,shell=True,stdout=subprocess.PIPE)

flag=[]

while True:

    line = child.stdout.readline()

    if line.find("limit") != -1:

        j = line.split()[11].split(",")[0]

        flag.append(j)

        delete=flag[-1]

        num=flag.count(delete)

        if num>=5:

            for i in range(num):

                index=flag.index(delete)

                del flag[index]

            print flag

            f=open(file,'a')

            f.write("deny " +delete+";"+'\n')

            f.close()