Python / Zeep / SOAP代理问题我认为

问题描述

我正在尝试使其工作：

Practitioner notes -> Python scripts for automation in NA -> Python client to invoke NA SOAP APIs

这是我的代码（经过了一些消毒）：

#! /usr/bin/env python3
from requests import Session
from zeep import Client
from zeep.transports import Transport

session = Session()
session.verify = False

transport = Transport(session=session)

client = Client( 'https://SERVER_FQDN/soap?wsdl=api.wsdl.wsdl2py',transport=transport)

# I added this for the network proxy
client.transport.session.proxies = {
        'http': '10.0.0.1:80','https': '10.0.0.1:80',}

# Then found I needed this because "localhost" is hard-coded in the WSDL 
client.service._binding_options['address'] = 'https://SERVER_FQDN/soap' 

login_params = { 
            'username':'user','password':'PASSWORD',}
loginResult = client.service.login(parameters=login_params )

sesnhdr_type = client.get_element('ns0:list_deviceInputParms')

sesnhdr = sesnhdr_type(sessionid=loginResult.Text)

devices = client.service.list_device(_soapheaders=[sesnhdr],parameters=sesnhdr)

print('\n\n ----------------------------- \n')
for i in devices.ResultSet.Row:
    print(i.hostName + ' ---> '+i.primaryIPAddress)
    params = {
            "ip":i.primaryIPAddress,"sessionid": loginResult.Text
            }
    device = client.service.show_deviceinfo(parameters=params)
    print(device.Text)
    print('\n\n ----------------------------- \n')

这是我的输出：

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py",line 667,in urlopen
    self._prepare_proxy(conn)
  File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py",line 932,in _prepare_proxy
    conn.connect()
  File "/usr/local/lib/python3.6/site-packages/urllib3/connection.py",line 317,in connect
    self._tunnel()
  File "/usr/lib64/python3.6/http/client.py",line 929,in _tunnel
    message.strip()))
OSError: Tunnel connection Failed: 503 Service Unavailable

During handling of the above exception,another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/requests/adapters.py",line 449,in send
    timeout=timeout
  File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py",line 727,in urlopen
    method,url,error=e,_pool=self,_stacktrace=sys.exc_info()[2]
  File "/usr/local/lib/python3.6/site-packages/urllib3/util/retry.py",line 439,in increment
    raise MaxRetryError(_pool,error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='SERVER_FQDN',port=443): Max retries exceeded with url: /soap (Caused by ProxyError('Cannot connect to proxy.',OSError('Tunnel connection Failed: 503 Service Unavailable',)))

During handling of the above exception,another exception occurred:

Traceback (most recent call last):
  File "./na-1.py",line XX,in <module>
    loginResult = client.service.login(parameters=login_params )
  File "/usr/local/lib/python3.6/site-packages/zeep/proxy.py",line 51,in __call__
    kwargs,File "/usr/local/lib/python3.6/site-packages/zeep/wsdl/bindings/soap.py",line 127,in send
    response = client.transport.post_xml(options["address"],envelope,http_headers)
  File "/usr/local/lib/python3.6/site-packages/zeep/transports.py",line 107,in post_xml
    return self.post(address,message,headers)
  File "/usr/local/lib/python3.6/site-packages/zeep/transports.py",line 74,in post
    address,data=message,headers=headers,timeout=self.operation_timeout
  File "/usr/local/lib/python3.6/site-packages/requests/sessions.py",line 578,in post
    return self.request('POST',data=data,json=json,**kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/sessions.py",line 530,in request
    resp = self.send(prep,**send_kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/sessions.py",line 643,in send
    r = adapter.send(request,**kwargs)
  File "/usr/local/lib/python3.6/site-packages/requests/adapters.py",line 510,in send
    raise ProxyError(e,request=request)
requests.exceptions.ProxyError: HTTPSConnectionPool(host='SERVER_FQDN',)))

如果我使用“ localhost”并在问题服务器上运行脚本，则会遇到相同的错误。系统已设置代理环境值。服务器有正确的正向和反向DNS条目。服务器的名称和IP也位于/ etc / hosts

这是问题所在：如果我使用IP地址而不是服务器的FQDN，则代码将运行。

供应商支持表示问题出在提供端点的应用程序中：

503错误表示该服务不可用，在三种情况下调用此行为：1.服务器正在维护中； 2.服务器过载； 3.在极少数情况下，DNS配置有问题。如果看到的话，这个问题与NA无关，因为请求可以与IP正常工作。

对此有何想法？

为什么仅IP有效，而FQDN或localhost不起作用？

解决方法

我的问题在于客户端的初始化想要继续进行连接，但我需要在开始时进行代理设置。因此，我拼凑了 official docs 中的两个示例，以在建立连接时设置代理。

from zeep import Client
from zeep.transports import Transport
from requests import Session

session = Session()
session.proxies = {
    'http': 'http://username:password@proxy.example.com:8080','https': 'http://username:password@proxy.example.com:8080'
}
transport=Transport(session=session)
client = Client(URL,transport=transport)

我看到的大部分关于在 Zeep 中使用代理的文档都以 client = Client(url) 开头，但如果 url 位于防火墙后面并且只能通过代理访问，则这不起作用！我根据文档尝试做的事情除了超时（当然）之外什么也没做。

关键在于理解 Zeep 建立在 requests 之上，请求可以使用代理来启动会话。因此，您需要构建一个代理会话，然后将该会话传递给传输，并使用该传输初始化 Zeep 客户端。这对我有用：


session = requests.Session()
session.auth = requests.auth.HTTPBasicAuth(soap_username,soap_password)
session.proxies = {"https": f"socks5://{settings.STATIC_PROXY}"}
transport = zeep.transports.Transport(session=session,timeout=(5,30))
client = zeep.Client(url,transport=transport)

proxy proxy python zeep