#encoding=utf-8
#author: walker
#date: 2016-04-14
#summary: 用协程/线程池并发检验代理有效性
import os, sys, time
import requests
from concurrent import futures
cur_dir_fullpath = os.path.dirname(os.path.abspath(__file__))
Headers = {
 'Accept': '*/*',
 'User-Agent': 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)',
 }
#检验单个代理的有效性
#如果有效，返回该proxy；否则，返回空字符串
def Check(desturl, proxy, feature):
 proxies = {'http': 'http://' + proxy}
 r = None #声明
 exMsg = None
 try:
 r = requests.get(url=desturl, headers=Headers, proxies=proxies, timeout=3)
 except:
 exMsg = '* ' + traceback.format_exc()
 #print(exMsg)
 finally:
 if 'r' in locals() and r:
 r.close()
 if exMsg:
 return ''
 if r.status_code != 200:
 return ''
 if r.text.find(feature) < 0:
 return ''
 return proxy
#输入代理列表(set/list)，返回有效代理列表
def GetValidProxyPool(rawProxyPool, desturl, feature):
 validProxyList = list() #有效代理列表
 pool = futures.ThreadPoolExecutor(8)
 futureList = list()
 for proxy in rawProxyPool:
 futureList.append(pool.submit(Check, desturl, proxy, feature))
 print('
 submit done, waiting for responses
')
 for future in futures.as_completed(futureList):
 proxy = future.result()
 print('proxy:' + proxy)
 if proxy: #有效代理
 validProxyList.append(proxy)
 print('validProxyList size:' + str(len(validProxyList)))
 return validProxyList
#获取原始代理池
def GetRawProxyPool():
 rawProxyPool = set()
 #通过某种方式获取原始代理池......
 return rawProxyPool
if __name__ == "__main__":
 rawProxyPool = GetRawProxyPool()
 desturl = 'http://...' #需要通过代理访问的目标地址
 feature = 'xxx' #目标网页的特征码
 validProxyPool = GetValidProxyPool(rawProxyPool, desturl, feature)

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