python suds 一坑

当被调用服务的返回xml内容值不是按照wsdl文件描述定义的， 就莫名奇妙返回suds.WebFault

没有更多详细信息！

于是将源码解压，并插入到sys.path[0]， 通过设置断点的方式找出非标准的返回报文到底在说啥。从而调整对应参数。

suds-0.4/suds/bindings/binding.py (246~268)

    def get_fault(self, reply):
        """
        Extract the fault from the specified soap reply.  If I{faults} is True, an
        exception is raised.  Otherwise, the I{unmarshalled} fault L{Object} is
        returned.  This method is called when the server raises a I{web fault}.
        @param reply: A soap reply message.
        @type reply: str
        @return: A fault object.
        @rtype: tuple ( L{Element}, L{Object} )
        """
        import pdb
        pdb.set_trace()
        reply = self.replyfilter(reply)
        sax = Parser()
        faultroot = sax.parse(string=reply)
        soapenv = faultroot.getChild('Envelope')
        soapbody = soapenv.getChild('Body')
        fault = soapbody.getChild('Fault')
        unmarshaller = self.unmarshaller(False)
        p = unmarshaller.process(fault)
        if self.options().faults:
            raise WebFault(p, faultroot)
        return (faultroot, p.detail)

顺便记录下suds神器的基本用法，方便查阅：

1. 查看服务接口

import suds
client=suds.client.Client('xxxx_webservice_url')
def get_all_methods(client):
    return [method for method in client.wsdl.services[0].ports[0].methods]

2. 查看某个具体接口的传输参数及类型

def get_method_args(client, method_name):
    method = client.wsdl.services[0].ports[0].methods[method_name]
    input_params = method.binding.input
    return input_params.param_defs(method)

3. 调用接口服务

client.service.xxx_function(....)

4. 关于调试

输出之前调用服务接口时发送了什么soap报文，以及收到什么样的soap报文

print 'last sent:\n', client.last_sent()
print 'last recv:\n', client.last_received()

当服务器返回报文格式不规范时(非wsdl中定义的），client.last_received()为None。这个时候显然对联调极为不利。

那就利用suds自身的日志记录看看咯。设定如下：

import sys
import logging
logger = logging.getLogger('suds')
logger.setLevel(logging.DEBUG)
logger.addHandler(logging.StreamHandler(sys.stdout))

如果只关心传输了什么，则可以限定logger为“suds.transport.http“

import sys
logger = logging.getLogger('suds.transport.http')
logger.setLevel(logging.DEBUG)
logger.addHandler(logging.StreamHandler(sys.stdout))

5. 异常的捕捉和输出

try:
    client.service.xxx_func(*args, **kwargs)
except suds.WebFault,ex:
    print ex.fault
    print ex.document

后记：对于第三方库莫名其妙的问题，果断及时拿源码过来剖析（至少debug）

DEMO

来个demo说明如何运用，如下：

>>> import suds
>>> url='http://www.gpsso.com/webservice/kuaidi/kuaidi.asmx?wsdl'
>>> client = suds.client.Client(url)
>>> print get_all_methods(client)
[KuaidiQuery]
>>> print get_method_args(client, 'KuaidiQuery')
[(Compay, <Element:0x7f6c55bc43d0 name="Compay" type="(u'string', u'http://www.w3.org/2001/XMLSchema')" />), (OrderNo, <Element:0x7f6c55bc4450 name="OrderNo" type="(u'string', u'http://www.w3.org/2001/XMLSchema')" />)]
>>> print client.service.KuaidiQuery(Company='EMS', OrderNo='')
(KuaidiQueryResult){
   API =
      (API){
         RESULTS = ""
         MESSAGE = "接口查询成功"
      }
 }
>>> print client.last_sent()
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:ns0="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://gpsso.com/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
   <SOAP-ENV:Header/>
   <ns0:Body>
      <ns1:KuaidiQuery>
         <ns1:OrderNo>1111</ns1:OrderNo>
      </ns1:KuaidiQuery>
   </ns0:Body>
</SOAP-ENV:Envelope>
>>> print client.last_received()
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope>
   <soap:Body>
      <KuaidiQueryResponse xmlns="http://gpsso.com/">
         <KuaidiQueryResult>
            <API>
               <RESULTS>0</RESULTS>
               <MESSAGE>接口查询成功</MESSAGE>
            </API>
         </KuaidiQueryResult>
      </KuaidiQueryResponse>
   </soap:Body>
</soap:Envelope>

转载请注明本文来源：http://www.cnblogs.com/Tommy-Yu/p/5567091.html

谢谢！