用Python实现批量测试一组url的可用性（可以包括HTTP状态、响应时间等）并统计出现不可用情况的次数和频率等。
类似的，这样的脚本可以判断某个服务的可用性，以及在众多的服务提供者中选择最优的。
需求以及脚本实现的功能如下：
默认情况下，执行脚本会检测一组url的可用性。
如果可用，返回从脚本所在的机器到HTTP服务器所消耗的时间和内容等信息。
如果url不可用，则记录并提示用户，并显示不可用发生的时间。
默认情况下，允许最大的错误次数是200，数目可以自定义，如果达到允许的最大错误次数，则在输出信息的最后，根据每一个url做出错误统计。
如果用户手动停止脚本，则需要在输出信息的最后，根据每一个url做出错误统计。
脚本中涉及的一些技巧：
使用gevent并发处理多个HTTP请求，多个请求之间无须等待响应（gevent还有很多使用技巧，可再自行学习）；
使用signal模块捕获信号，如果捕获到则处理并退出，避免主进程接收到KeyboardInterrupt直接退出但无法处理的问题；
注意留意脚本中关于统计次数方面的小技巧；
脚本运行效果图（如果图片看不清楚，请选择“在新标签页中打开图片”）如下：
脚本可以参见Github，https://github.com/DingGuodong/LinuxBashShellScriptForOps/tree/master/projects/checkServicesAvailability/HttpService
脚本如下：
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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计算HTTp可用性,python 统计次数,python gevent
--end--
本文转自 urey_pp 51CTO博客，原文链接：http://blog.51cto.com/dgd2010/1865925，如需转载请自行联系原作者
