Changes between Version 38 and Version 39 of XML-RPC

Timestamp:

Sep 8, 2007, 12:58:21 PM (17 years ago)

Author:

anonymous

Comment:

spam--

XML-RPC

@@ -1 @@
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+NOTE: All credit for this code goes to Crast in irc.freenode.net:#django...
+
+This uses SimpleXMLRPCDispatcher which is part of the standard Python lib in 2.4 (And possibly earlier versions).
+
+
+In discussing ways of handling XML-RPC for Django, I realised I really needed a way to do it without patching Django's code.  Crast in #django came up with a great solution, which I have modified and tweaked a bit.
+
+I've included it here.  Feel free to fiddle with it and make it your own ... All this code is '''post-mr'''
+
+Any crappy & garbage code is completely mine; I'm still learning Python so bear with me.  The hacks I added for self-documentation output are just that; any improvements to them would probably be a good thing.
+
+First, setup your urls.py to map an XML-RPC service:
+
+
+{{{
+#!python
+urlpatterns = patterns('',
+    # XML-RPC
+     (r'^xml_rpc_srv/', 'yourproject.yourapp.xmlrpc.rpc_handler'),
+)
+}}}
+
+
+Then, in the appropriate place, create a file called xmlrpc.py
+
+
+{{{
+#!python
+# Patchless XMLRPC Service for Django
+# Kind of hacky, and stolen from Crast on irc.freenode.net:#django
+# Self documents as well, so if you call it from outside of an XML-RPC Client
+# it tells you about itself and its methods
+#
+# Brendan W. McAdams <brendan.mcadams@thewintergrp.com>
+
+# SimpleXMLRPCDispatcher lets us register xml-rpc calls w/o
+# running a full XMLRPC Server.  It's up to us to dispatch data
+
+from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
+from django.http import HttpResponse
+
+# Create a Dispatcher; this handles the calls and translates info to function maps
+#dispatcher = SimpleXMLRPCDispatcher() # Python 2.4
+dispatcher = SimpleXMLRPCDispatcher(allow_none=False, encoding=None) # Python 2.5
+
+ 
+
+def rpc_handler(request):
+        """
+        the actual handler:
+        if you setup your urls.py properly, all calls to the xml-rpc service
+        should be routed through here.
+        If post data is defined, it assumes it's XML-RPC and tries to process as such
+        Empty post assumes you're viewing from a browser and tells you about the service.
+        """
+
+        response = HttpResponse()
+        if len(request.POST):
+                response.write(dispatcher._marshaled_dispatch(request.raw_post_data))
+        else:
+                response.write("<b>This is an XML-RPC Service.</b><br>")
+                response.write("You need to invoke it using an XML-RPC Client!<br>")
+                response.write("The following methods are available:<ul>")
+                methods = dispatcher.system_listMethods()
+
+                for method in methods:
+                        # right now, my version of SimpleXMLRPCDispatcher always
+                        # returns "signatures not supported"... :(
+                        # but, in an ideal world it will tell users what args are expected
+                        sig = dispatcher.system_methodSignature(method)
+
+                        # this just reads your docblock, so fill it in!
+                        help =  dispatcher.system_methodHelp(method)
+
+                        response.write("<li><b>%s</b>: [%s] %s" % (method, sig, help))
+
+                response.write("</ul>")
+                response.write('<a href="http://www.djangoproject.com/"> <img src="http://media.djangoproject.com/img/badges/djangomade124x25_grey.gif" border="0" alt="Made with Django." title="Made with Django."></a>')
+
+        response['Content-length'] = str(len(response.content))
+        return response
+
+def multiply(a, b):
+        """
+        Multiplication is fun!
+        Takes two arguments, which are multiplied together.
+        Returns the result of the multiplication!
+        """
+        return a*b
+
+# you have to manually register all functions that are xml-rpc-able with the dispatcher
+# the dispatcher then maps the args down.
+# The first argument is the actual method, the second is what to call it from the XML-RPC side...
+dispatcher.register_function(multiply, 'multiply')
+}}}
+
+That's it!
+
+You can pretty much write a standard python function in there, just be sure to register it with the dispatcher when you're done.  
+
+Here's a quick and dirty client example for testing:
+
+{{{
+#!python
+import sys
+import xmlrpclib
+rpc_srv = xmlrpclib.ServerProxy("http://localhost:8000/xml_rpc_srv/")
+result = rpc_srv.multiply( int(sys.argv[1]), int(sys.argv[2]))
+print "%d * %d = %d" % (sys.argv[1], sys.argv[2], result)
+}}}
+
+Based on experience, I do recommend that you use Dictionaries for your args rather than long args, but I think that's personal preference (It allows named arguments, eliminates 'out of order' argument issues and it makes the code more self-documenting).
+
+Have fun!
+
+- [mailto:bwmcadams@NOSPAM.gmail.com  Brendan W. McAdams <bwmcadams@NOSPAM.gmail.com>]
+
+----
+
+I wrote up [http://www.personal-api.com/train/2007/feb/01/pingbacks-xml-rpc-and-django/ a modified version of the XML-RPC view] that uses a template for documentation. -- [mailto:hackerblinks+django@gmail.com Adam Blinkinsop <hackerblinks+django@gmail.com>]
+
+----
+
+I've taken the basics of the SimpleXMLRPCDispatcher above and have turned it into a distributable Django app, [http://code.google.com/p/django-xmlrpc django_xmlrpc]. -- [mailto:graham.binns+django-xmlrpc@gmail.com Graham Binns]
+