前言

随着站点的增多,管理复杂性也上来了,俗话说:人多了不好带,我发现站点多了也不好管,因为这些站点里有重要的也有不重要的,重要核心的站点当然就管理的多一些,像一些万年都不出一次问题的,慢慢就被自己都淡忘了,冷不丁那天出个问题,还的手忙脚乱的去紧急处理,所以规范的去管理这些站点是很有必要的,今天我们就做第一步,不管大站小站,先统一把监控做起来,先不说业务情况,最起码那个站点不能访问了,要第一时间报出来,别等着业务方给你反馈,就显得我们不够专业了,那接下来我们看看如果用python实现多网站的可用性监控,脚本如下:

#!/usr/bin/env python
 
 
import pickle, os, sys, logging
from httplib import HTTPConnection, socket
from smtplib import SMTP
 
def email_alert(message, status):
 fromaddr = \'xxx@163.com\'
 toaddrs = \'xxxx@qq.com\'
 
 server = SMTP(\'smtp.163.com:25\')
 server.starttls()
 server.login(\'xxxxx\', \'xxxx\')
 server.sendmail(fromaddr, toaddrs, \'Subject: %s\\r\\n%s\' % (status, message))
 server.quit()
 
def get_site_status(url):
 response = get_response(url)
 try:
  if getattr(response, \'status\') == 200:
   return \'up\'
 except AttributeError:
  pass
 return \'down\'
  
def get_response(url):
 try:
  conn = HTTPConnection(url)
  conn.request(\'HEAD\', \'/\')
  return conn.getresponse()
 except socket.error:
  return None
 except:
  logging.error(\'Bad URL:\', url)
  exit(1)
  
def get_headers(url):
 response = get_response(url)
 try:
  return getattr(response, \'getheaders\')()
 except AttributeError:
  return \'Headers unavailable\'
 
def compare_site_status(prev_results):
 
 def is_status_changed(url):
  status = get_site_status(url)
  friendly_status = \'%s is %s\' % (url, status)
  print friendly_status
  if url in prev_results and prev_results[url] != status:
   logging.warning(status)
   email_alert(str(get_headers(url)), friendly_status)
  prev_results[url] = status
 
 return is_status_changed
 
def is_internet_reachable():
 if get_site_status(\'www.baidu.com\') == \'down\' and get_site_status(\'www.sohu.com\') == \'down\':
  return False
 return True
 
def load_old_results(file_path):
 pickledata = {}
 if os.path.isfile(file_path):
  picklefile = open(file_path, \'rb\')
  pickledata = pickle.load(picklefile)
  picklefile.close()
 return pickledata
 
def store_results(file_path, data):
 output = open(file_path, \'wb\')
 pickle.dump(data, output)
 output.close()
 
def main(urls):
 logging.basicConfig(level=logging.WARNING, filename=\'checksites.log\', 
   format=\'%(asctime)s %(levelname)s: %(message)s\', 
   datefmt=\'%Y-%m-%d %H:%M:%S\')
 
 pickle_file = \'data.pkl\'
 pickledata = load_old_results(pickle_file)
 print pickledata
  
 if is_internet_reachable():
  status_checker = compare_site_status(pickledata)
  map(status_checker, urls)
 else:
  logging.error(\'Either the world ended or we are not connected to the net.\')
  
 store_results(pickle_file, pickledata)
 
if __name__ == \'__main__\':
 main(sys.argv[1:])

脚本核心点解释:

1、getattr()是python的内置函数,接收一个对象,可以根据对象属性返回对象的值。

2、compare_site_status()函数是返回的是一个内部定义的函数。

3、map() ,需要2个参数,一个是函数,一个是序列,功能就是将序列中的每个元素应用函数方法。

总结

以上就是这篇文章的全部内容,有需要的朋友们可以参考借鉴。