python多进程-进程池模式退出异常解决办法

在执行python脚本的多进程程序时，会随机性的触发程序执行完，无法主动退出的情况。尤其是当进程数足够大时，处理的数据量足够多时。出现退出异常的概率越大。下面的脚本用于解决退出异常问题。

import argparse
import requests
import getpass
from multiprocessing import Pool
import datetime
import time
from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

def get_parameter():
    parser=argparse.ArgumentParser(description='利用requests库批量访问url(v3)')
    parser.add_argument('-f',dest='inputFile',type=str,default='',help='url文件')
    parser.add_argument('-o',dest='outputFile',type=str,default='result.txt',help='结果保存文件')
    parser.add_argument('-p',dest='proxyServer',type=str,default='',help='设置代理服务器，默认不指定')
    parser.add_argument('-n',dest='processNum',type=int,default='1',help='指明脚本进程数，缺省为1')
    args=parser.parse_args()
    inputFile=args.inputFile
    outputFile=args.outputFile
    proxyServer=args.proxyServer
    processNum=args.processNum
    return inputFile,outputFile,proxyServer,processNum

def set_proxy(urlProxy):
    if not urlProxy:
        proxies={}
    else:
        username=input('username:')
        password=getpass.getpass('password:')
        http_proxy='http://'+str(username)+':'+str(password)+'@'+str(urlProxy)
        https_proxy='https://'+str(username)+':'+str(password)+'@'+str(urlProxy)
        proxies={
            'http':http_proxy,
            'https':https_proxy
        }
    return proxies

def get_url(urlFile):
    with open(urlFile,'r') as urlFile:
        allUrl=urlFile.readlines()
    return allUrl

def http_request(url,proxy=''):
    headers={
        'User-Agent':'curl/3.03',
        'Connection':'close'    # keep-alive
    }
    try:
        r=requests.get(url,headers=headers,proxies=proxy,timeout=15,verify=False)
        urlresult=url+'\t'+str(r.status_code)
    except Exception as e:
        urlresult=url+'\t'+str(e)
    finally:
        print(urlresult)
        return urlresult

def main():
    start_time=datetime.datetime.now()
    inputFile, outputFile, proxyServer, processNum=get_parameter()
    allUrl=get_url(inputFile)
    proxies=set_proxy(proxyServer)
    p=Pool(processNum)
    print('总URL数量：{}'.format(len(allUrl)))
    def writer_log(urlresult):
        with open(outputFile,'a+') as wf:
            wf.write(urlresult+'\n')
    # with open(outputFile,'w+') as wf:
    for i in allUrl:
        url=i.split()[-1]
        result=p.apply_async(http_request,args=(url,proxies),callback=writer_log)
    p.close()
    count=0
    while True:
        try:
            time.sleep(60)
            if result.ready():
                count+=1
                time.sleep(180)
                result.get()
            if count>4:
                break
        except Exception as e:
            print('进程异常：{}'.format(str(e)))
    p.terminate()
    p.join()
    end_time=datetime.datetime.now()
    print('开始时间：{}'.format(start_time))
    print('结束时间：{}'.format(end_time))
    print('总耗时:{}'.format(end_time-start_time))
    print('结果保存在：{}'.format(outputFile))

if __name__=='__main__':
    main()