??????Python??????????????url???????????????HTTP????????????????????????????????????????
????????????????????????ж????????????????????????????????????????
????????????????????????￡?
????1?????????￡???н?????????url????????
????2???????????????????????????HTTP???????????????????????????
????3?????url???????????????????????????????÷????????
????4?????????￡???????????????200?????????????壬????????????????????????????????????????url????????????
????5??????????????????????????????????????????url????????????
??????????漰???Щ?????
????1?????gevent??????????HTTP?????????????????????????gevent???к????ü??????????????????
????2?????signal??鯰??????????????????????????????????????KeyboardInterrupt????????????????????
????3????????????й??????????????С?????
???????????Ч????? ???????????????????“???±????д???” ?????￡?

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#!/usr/bin/python
# encoding: utf-8
# -*- coding: utf8 -*-
"""
Created by PyCharm.
File:               LinuxBashShellScriptForOps:testNoHttpResponseException??testHttpHostAvailability.py
User:               Guodong
Create Date:        2016/10/26
Create Time:        12:09
Function:
test Http Host Availability
Some helpful message:
For CentOS: yum -y install python-devel python-pip; pip install gevent
For Ubuntu: apt-get -y install python-dev python-pip; pip install gevent
For Windows: pip install gevent
"""
import signal
import time
import sys
#  execute some operations concurrently using python
from gevent import monkey
monkey.patch_all()
import gevent
import urllib2
hosts = ['https://webpush.wx2.qq.com/cgi-bin/mmwebwx-bin/synccheck'??
'https://webpush.wx.qq.com/cgi-bin/mmwebwx-bin/synccheck'?? ]
errorStopCounts = 200
quit_flag = False
statistics = dict()
def changeQuit_flag(signum?? frame):
del signum?? frame
global quit_flag
quit_flag = True
print "Canceled task on their own by the user."
def testNoHttpResponseException(url):
tryFlag = True
global quit_flag
errorCounts = 0
tryCounts = 0
global statistics
globalStartTime = time.time()
while tryFlag:
if not quit_flag:
tryCounts += 1
print('GET: %s' % url)
try:
startTime = time.time()
resp = urllib2.urlopen(url)  # using module 'request' will be better?? request will return header info..
endTime = time.time()
data = resp.read()
responseTime = endTime - startTime
print '%d bytes received from %s. response time is: %s' % (len(data)?? url?? responseTime)
print "data received from %s at %d try is: %s" % (url?? tryCounts?? data)
gevent.sleep(2)
except urllib2.HTTPError as e:
errorCounts += 1
statistics[url] = errorCounts
currentTime = time.strftime('%Y-%m-%d %H:%M:%S'?? time.localtime())
print "HTTPError occurred?? %s?? and this is %d times(total) occurs on %s at %s." % (
e?? statistics[url]?? url?? currentTime)
if errorCounts >= errorStopCounts:
globalEndTime = time.time()
tryFlag = False
else:
globalEndTime = time.time()
break
for url in statistics:
print "Total error counts is %d on %s" % (statistics[url]?? url)
hosts.remove(url)
for url in hosts:
print "Total error counts is 0 on %s" % url
globalUsedTime = globalEndTime - globalStartTime
print "Total time use is %s" % globalUsedTime
sys.exit(0)
try:
# Even if the user cancelled the task??
# it also can statistics the number of errors and the consumption of time for each host.
signal.signal(signal.SIGINT?? changeQuit_flag)
gevent.joinall([gevent.spawn(testNoHttpResponseException?? host) for host in hosts])
except KeyboardInterrupt:
# Note: this line can NOT be reached?? because signal has been captured!
print "Canceled task on their own by the user."
sys.exit(0)
????tag:python????HTTp???????python ????????python gevent