利用Python+阿里云实现DDNS动态域名解析的方法

#获得IP检测的网页URL
def getIpPage():
 url = "http://www.ip138.com/"
 response = urllib.request.urlopen(url)
 html = response.read().decode("gb2312")
 soup = BeautifulSoup(html, "lxml")
 _iframe = soup.body.iframe
 return _iframe["src"]

#获取IP地址
def getRealIp(url):
 response = urllib.request.urlopen(url)
 html = response.read().decode("gb2312")
 pattern = r"(25[0-5]|2[0-4]\d|[0-1]\d{2}|[1-9]?\d)\.(25[0-5]|2[0-4]\d|[0-1]\d{2}|[1-9]?\d)\.(25[0-5]|2[0-4]\d|[0-1]\d{2}|[1-9]?\d)\.(25[0-5]|2[0-4]\d|[0-1]\d{2}|[1-9]?\d)"
 matchs = re.search(pattern,html)
 ip_addr = ""
 for i in range(1,5):
  ip_addr += matchs.group(i) + "."
 return ip_addr[:-1]

class CommonRequestSing:
 #私有类变量
 __request = None

 #该修饰符将实例方法变成类方法
 #,因为类方法无法操作私有的类变量，所以使用实例方法进行操作，再进行转换为类方法
 @classmethod
 def getInstance(self):
  if self.__request is None:
   self.__request = CommonRequest()
  return self.__request

class AcsClientSing:
 __client = None
 @classmethod
 def getInstance(self):
  if self.__client is None:
   self.__client = AcsClient('Your_AccessKeyId', 'Your_AccessKeySecret', 'cn-hangzhou')
  return self.__client

#获取二级域名的RecordId
 def getRecordId(domain):
  client = Utils.getAcsClient()
  request = Utils.getCommonRequest()
  request.set_domain('alidns.aliyuncs.com')
  request.set_version('2015-01-09')
  request.set_action_name('DescribeDomainRecords')
  request.add_query_param('DomainName', 'Your_DomainName eg.example.com')
  response = client.do_action_with_exception(request)
  jsonObj = json.loads(response.decode("UTF-8"))
  records = jsonObj["DomainRecords"]["Record"]
  for each in records:
   if each["RR"] == domain:
    return each["RecordId"]

def DDNS():
 client = Utils.getAcsClient()
 recordId = Utils.getRecordId('ddns')
 ip = Utils.getRealIP()
 request = Utils.getCommonRequest()
 request.set_domain('alidns.aliyuncs.com')
 request.set_version('2015-01-09')
 request.set_action_name('UpdateDomainRecord')
 request.add_query_param('RecordId', recordId)
 request.add_query_param('RR', 'ddns')
 request.add_query_param('Type', 'A')
 request.add_query_param('Value', ip)
 response = client.do_action_with_exception(request)
 return response

if __name__ == "__main__":
 try:
  result = DDNS()
  print("成功！")
 except (ServerException,ClientException) as reason:
  print("失败！原因为")
  print(reason.get_error_msg())