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代理ip池
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Jack-Cherish committed May 28, 2017
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139 changes: 139 additions & 0 deletions daili.py
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# -*- coding:UTF-8 -*-
from bs4 import BeautifulSoup
from selenium import webdriver
import subprocess as sp
from lxml import etree
import requests
import random
import re

"""
函数说明:获取IP代理
Parameters:
page - 高匿代理页数,默认获取第一页
Returns:
proxys_list - 代理列表
Modify:
2017-05-27
"""
def get_proxys(page = 1):
#requests的Session可以自动保持cookie,不需要自己维护cookie内容
S = requests.Session()
#西祠代理高匿IP地址
target_url = 'http://www.xicidaili.com/nn/%d' % page
#完善的headers
target_headers = {'Upgrade-Insecure-Requests':'1',
'User-Agent':'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'Referer':'http://www.xicidaili.com/nn/',
'Accept-Encoding':'gzip, deflate, sdch',
'Accept-Language':'zh-CN,zh;q=0.8',
}
#get请求
target_response = S.get(url = target_url, headers = target_headers)
#utf-8编码
target_response.encoding = 'utf-8'
#获取网页信息
target_html = target_response.text
#获取id为ip_list的table
bf1_ip_list = BeautifulSoup(target_html, 'lxml')
bf2_ip_list = BeautifulSoup(str(bf1_ip_list.find_all(id = 'ip_list')), 'lxml')
ip_list_info = bf2_ip_list.table.contents
#存储代理的列表
proxys_list = []
#爬取每个代理信息
for index in range(len(ip_list_info)):
if index % 2 == 1 and index != 1:
dom = etree.HTML(str(ip_list_info[index]))
ip = dom.xpath('//td[2]')
port = dom.xpath('//td[3]')
protocol = dom.xpath('//td[6]')
proxys_list.append(protocol[0].text.lower() + '#' + ip[0].text + '#' + port[0].text)
#返回代理列表
return proxys_list

"""
函数说明:检查代理IP的连通性
Parameters:
ip - 代理的ip地址
lose_time - 匹配丢包数
waste_time - 匹配平均时间
Returns:
average_time - 代理ip平均耗时
Modify:
2017-05-27
"""
def check_ip(ip, lose_time, waste_time):
#命令 -n 要发送的回显请求数 -w 等待每次回复的超时时间(毫秒)
cmd = "ping -n 3 -w 3 %s"
#执行命令
p = sp.Popen(cmd % ip, stdin=sp.PIPE, stdout=sp.PIPE, stderr=sp.PIPE, shell=True)
#获得返回结果并解码
out = p.stdout.read().decode("gbk")
#丢包数
lose_time = lose_time.findall(out)
#当匹配到丢失包信息失败,默认为三次请求全部丢包,丢包数lose赋值为3
if len(lose_time) == 0:
lose = 3
else:
lose = int(lose_time[0])
#如果丢包数目大于2个,则认为连接超时,返回平均耗时1000ms
if lose > 2:
#返回False
return 1000
#如果丢包数目小于等于2个,获取平均耗时的时间
else:
#平均时间
average = waste_time.findall(out)
#当匹配耗时时间信息失败,默认三次请求严重超时,返回平均好使1000ms
if len(average) == 0:
return 1000
else:
#
average_time = int(average[0])
#返回平均耗时
return average_time

"""
函数说明:初始化正则表达式
Parameters:
Returns:
lose_time - 匹配丢包数
waste_time - 匹配平均时间
Modify:
2017-05-27
"""
def initpattern():
#匹配丢包数
lose_time = re.compile(u"丢失 = (\d+)", re.IGNORECASE)
#匹配平均时间
waste_time = re.compile(u"平均 = (\d+)ms", re.IGNORECASE)
return lose_time, waste_time

if __name__ == '__main__':
#初始化正则表达式
lose_time, waste_time = initpattern()
#获取IP代理
proxys_list = get_proxys(1)

#如果平均时间超过200ms重新选取ip
while True:
#从100个IP中随机选取一个IP作为代理进行访问
proxy = random.choice(proxys_list)
split_proxy = proxy.split('#')
#获取IP
ip = split_proxy[1]
#检查ip
average_time = check_ip(ip, lose_time, waste_time)
if average_time > 200:
#去掉不能使用的IP
proxys_list.remove(proxy)
print("ip连接超时, 重新获取中!")
if average_time < 200:
break

#去掉已经使用的IP
proxys_list.remove(proxy)
proxy_dict = {split_proxy[0]:split_proxy[1] + ':' + split_proxy[2]}
print("使用代理:", proxy_dict)

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