WCF and Python

Question

Is there any example code of a cpython (not IronPython) client which can call Windows Communication Foundation (WCF) service?

Answer 1

Just to help someone to access WCF SOAP 1.2 service with WS-Addressing using suds. Main problem is to inject action name in every message.

This example for python 3 and suds port https://bitbucket.org/jurko/suds.

Example uses custom authentification based on HTTP headers, i leave it as is.

TODO: Automatically get api_direct_url from WSDL (at now it is hard coded).

from suds.plugin import MessagePlugin
from suds.sax.text import Text
from suds.wsse import Security, UsernameToken
from suds.sax.element import Element
from suds.sax.attribute import Attribute
from suds.xsd.sxbasic import Import

api_username = 'some'
api_password = 'none'

class api(object):
    api_direct_url = 'some/mex'
    api_url = 'some.svc?singleWsdl|Wsdl'

    NS_WSA = ('wsa', 'http://www.w3.org/2005/08/addressing')

    _client_instance = None
    @property
    def client(self):
        if self._client_instance:
            return self._client_instance
        from suds.bindings import binding
        binding.envns = ('SOAP-ENV', 'http://www.w3.org/2003/05/soap-envelope')

        api_inst = self
        class _WSAPlugin(MessagePlugin):
            def marshalled(self, context):
                api_inst._marshalled_message(context)

        self._client_instance = Client(self.api_url,
                             plugins=[_WSAPlugin()],
                             headers={'Content-Type': 'application/soap+xml',
                                      'login':api_username,
                                      'password': api_password}
                             )
        headers = []
        headers.append(Element('To', ns=self.NS_WSA).setText(self.api_direct_url))
        headers.append(Element('Action', ns=self.NS_WSA).setText('Blank'))
        self._client_instance.set_options(soapheaders=headers)

        cache = self._client_instance.options.cache
        cache.setduration(days=10)
        return self._client_instance

    def _marshalled_message(self, context):
        def _children(r):
            if hasattr(r, 'children'):
                for c in r.children:
                    yield from _children(c)
                    yield c
        for el in _children(context.envelope):
            if el.name == 'Action':
                el.text = Text(self._current_action)
                return

    _current_action = None
    def _invoke(self, method, *args):
        try:
            self._current_action = method.method.soap.action.strip('"')
            return method(*args)
        finally:
            self._current_action = None

    def GetRequestTypes(self):
        return self._invoke(self.client.service.GetRequestTypes)[0]

    def GetTemplateByRequestType(self, request_type_id):
        js = self._invoke(self.client.service.GetTemplateByRequestType, request_type_id)
        return json.loads(js)

    def GetRequestStatus(self, request_guid):
        return self._invoke(self.client.service.GetRequestStatus, request_guid)

    def SendRequest(self, request_type_id, request_json):
        r = json.dumps(request_json, ensure_ascii=False)
        return self._invoke(self.client.service.SendRequest, request_type_id, r)