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Safari | Python Developer's Handbook -> XML-RPC





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152015024128143245168232148039199167010047123209178152124239215162148042031164044117125222

XML-RPC

XML-RPC is a specification and a set of implementations that allow software running on different operating systems and different environments to make procedure calls over the Internet. As a simple RPC protocol, it converts simple data types into an XML-based format, and then ships them over the network using HTTP-POST requests as the transport and XML as the encoding. The procedure executes on the server and the value it returns is also formatted in XML. Procedure parameters can be scalars, numbers, strings, dates, and so on; they can also be complex record and list structures.

XML-RPC is designed to be as simple as possible, while allowing complex data structures to be transmitted, processed, and returned. This re-use of high-level ideas such as XML and HTTP makes it inefficient in comparison to a binary format, but it also makes it easy to implement; implementations already exist for Java, Python, Perl, and Tcl, and Zope 2.0.

The XML-RPC library is copyrighted, but can be used without fee. This also applies to commercial applications. For more information, check out

XML-RPC

http://www.xmlrpc.com/

The XML-RPC specification documents the XML-RPC protocol implemented in Frontier 5.1.

http://www.xml-rpc.com/spec/

http://www.scripting.com/frontier5/xml/code/rpc.html

XML-RPC for Newbies, by Dave Winer

http://davenet.userland.com/1998/07/14/xmlRpcForNewbies

The Python Implementation

PythonWare's Fredrik Lundhs xmlrpc package provides everything you need to build clients and servers in Python:

http://www.pythonware.com/products/xmlrpc/

Secret Labs' xmlrpclib module is a client-side implementation of the XML-RPC protocol. This implementation is tightly integrated with Python, which makes it very easy to call remote methods. For example, here's the Python code needed to call one of Userland's sample servers:

						
betty =
 Server("http://betty.userland.com") print betty.examples.getStateName(41)
 
					

This results in a remote call to the examples.getStateName method published by the betty server, with the integer 41 as the single argument. The result from this call is a string with the value "South Dakota".

The marshalling and parsing classes provided by this module can also be used in XML-RPC server implementations. Sample code for Medusa and Python's SocketServer module is also included in the current release.

Working with Zope

Amos Latteier at Digital Creations has written an XML-RPC How To for Zope Users. Among other things, it contains code to handle authentication issues and access control.

The idea of using Zope to handle XML-RPC is based on the fact that every Zope object can respond to HTTP requests.

The How To covers the use of Zope as an XML-RPC server, and as an XML-RPC client. The document also shows how to extend Fredrik Lundh's XML-RPC Python module to support sending requests with basic authentication. It can be found at

http://www.zope.org/Members/Amos/XML-RPC


Last updated on 1/30/2002
Python Developer's Handbook, © 2002 Sams Publishing

< BACKMake Note | BookmarkCONTINUE >

Index terms contained in this section

data
     manipulating
            XML-RPC library 2nd
databases
      Zope Object (ZODB)
Digital Creations
Latteier, Amos
libraries
      XML-RPC 2nd
Lundhs, Fredrik
manipulating
     data
            XML-RPC library 2nd
packages
      xmlrpc
Secret Labs
XML-RPC How To for Zope Users
XML-RPC library
      manipulating data 2nd
xmlrpc package
xmlrpclib module 2nd
Zope Object Database (ZODB)

2002, O'Reilly & Associates, Inc.

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