Changes between Version 30 and Version 31 of XML-RPC


Ignore:
Timestamp:
07/18/2007 12:50:49 PM (8 years ago)
Author:
Ivan
Comment:

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  • XML-RPC

    v30 v31  
    1 
    2 = XML-RPC =
    3 
    4 
    5 NOTE: All credit for this code goes to Crast in irc.freenode.net:#django...
    6 
    7 This uses SimpleXMLRPCDispatcher which is part of the standard Python lib in 2.4 (And possibly earlier versions).
    8 
    9 
    10 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.
    11 
    12 I've included it here.  Feel free to fiddle with it and make it your own ... All this code is '''post-mr'''
    13 
    14 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.
    15 
    16 First, setup your urls.py to map an XML-RPC service:
    17 
    18 
    19 {{{
    20 #!python
    21 urlpatterns = patterns('',
    22     # XML-RPC
    23      (r'^xml_rpc_srv/', 'yourproject.yourapp.xmlrpc.rpc_handler'),
    24 )
    25 }}}
    26 
    27 
    28 Then, in the appropriate place, create a file called xmlrpc.py
    29 
    30 
    31 {{{
    32 #!python
    33 # Patchless XMLRPC Service for Django
    34 # Kind of hacky, and stolen from Crast on irc.freenode.net:#django
    35 # Self documents as well, so if you call it from outside of an XML-RPC Client
    36 # it tells you about itself and its methods
    37 #
    38 # Brendan W. McAdams <brendan.mcadams@thewintergrp.com>
    39 
    40 # SimpleXMLRPCDispatcher lets us register xml-rpc calls w/o
    41 # running a full XMLRPC Server.  It's up to us to dispatch data
    42 
    43 from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
    44 from django.http import HttpResponse
    45 
    46 # Create a Dispatcher; this handles the calls and translates info to function maps
    47 #dispatcher = SimpleXMLRPCDispatcher() # Python 2.4
    48 dispatcher = SimpleXMLRPCDispatcher(allow_none=False, encoding=None) # Python 2.5
    49 
    50  
    51 
    52 def rpc_handler(request):
    53         """
    54         the actual handler:
    55         if you setup your urls.py properly, all calls to the xml-rpc service
    56         should be routed through here.
    57         If post data is defined, it assumes it's XML-RPC and tries to process as such
    58         Empty post assumes you're viewing from a browser and tells you about the service.
    59         """
    60 
    61         response = HttpResponse()
    62         if len(request.POST):
    63                 response.write(dispatcher._marshaled_dispatch(request.raw_post_data))
    64         else:
    65                 response.write("<b>This is an XML-RPC Service.</b><br>")
    66                 response.write("You need to invoke it using an XML-RPC Client!<br>")
    67                 response.write("The following methods are available:<ul>")
    68                 methods = dispatcher.system_listMethods()
    69 
    70                 for method in methods:
    71                         # right now, my version of SimpleXMLRPCDispatcher always
    72                         # returns "signatures not supported"... :(
    73                         # but, in an ideal world it will tell users what args are expected
    74                         sig = dispatcher.system_methodSignature(method)
    75 
    76                         # this just reads your docblock, so fill it in!
    77                         help =  dispatcher.system_methodHelp(method)
    78 
    79                         response.write("<li><b>%s</b>: [%s] %s" % (method, sig, help))
    80 
    81                 response.write("</ul>")
    82                 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>')
    83 
    84         response['Content-length'] = str(len(response.content))
    85         return response
    86 
    87 def multiply(a, b):
    88         """
    89         Multiplication is fun!
    90         Takes two arguments, which are multiplied together.
    91         Returns the result of the multiplication!
    92         """
    93         return a*b
    94 
    95 # you have to manually register all functions that are xml-rpc-able with the dispatcher
    96 # the dispatcher then maps the args down.
    97 # The first argument is the actual method, the second is what to call it from the XML-RPC side...
    98 dispatcher.register_function(multiply, 'multiply')
    99 }}}
    100 
    101 That's it!
    102 
    103 You can pretty much write a standard python function in there, just be sure to register it with the dispatcher when you're done. 
    104 
    105 Here's a quick and dirty client example for testing:
    106 
    107 {{{
    108 #!python
    109 import sys
    110 import xmlrpclib
    111 rpc_srv = xmlrpclib.ServerProxy("http://localhost:8000/xml_rpc_srv/")
    112 result = rpc_srv.multiply( int(sys.argv[1]), int(sys.argv[2]))
    113 print "%d * %d = %d" % (sys.argv[1], sys.argv[2], result)
    114 }}}
    115 
    116 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).
    117 
    118 Have fun!
    119 
    120 - [mailto:brendan.mcadams@NOSPAM.thewintergrp.com  Brendan W. McAdams <brendan.mcadams@NOSPAM.thewintergrp.com>]
    121 
    122 ----
    123 
    124 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>]
    125 
    126 ----
    127 
    128 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]
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