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/Doc/library/simplexmlrpcserver.rst

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  1:mod:`SimpleXMLRPCServer` --- Basic XML-RPC server
  2==================================================
  3
  4.. module:: SimpleXMLRPCServer
  5   :synopsis: Basic XML-RPC server implementation.
  6.. moduleauthor:: Brian Quinlan <brianq@activestate.com>
  7.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
  8
  9.. note::
 10   The :mod:`SimpleXMLRPCServer` module has been merged into
 11   :mod:`xmlrpc.server` in Python 3.0.  The :term:`2to3` tool will automatically
 12   adapt imports when converting your sources to 3.0.
 13
 14
 15.. versionadded:: 2.2
 16
 17The :mod:`SimpleXMLRPCServer` module provides a basic server framework for
 18XML-RPC servers written in Python.  Servers can either be free standing, using
 19:class:`SimpleXMLRPCServer`, or embedded in a CGI environment, using
 20:class:`CGIXMLRPCRequestHandler`.
 21
 22
 23.. class:: SimpleXMLRPCServer(addr[, requestHandler[, logRequests[, allow_none[, encoding]]]])
 24
 25   Create a new server instance.  This class provides methods for registration of
 26   functions that can be called by the XML-RPC protocol.  The *requestHandler*
 27   parameter should be a factory for request handler instances; it defaults to
 28   :class:`SimpleXMLRPCRequestHandler`.  The *addr* and *requestHandler* parameters
 29   are passed to the :class:`SocketServer.TCPServer` constructor.  If *logRequests*
 30   is true (the default), requests will be logged; setting this parameter to false
 31   will turn off logging.   The *allow_none* and *encoding* parameters are passed
 32   on to  :mod:`xmlrpclib` and control the XML-RPC responses that will be returned
 33   from the server. The *bind_and_activate* parameter controls whether
 34   :meth:`server_bind` and :meth:`server_activate` are called immediately by the
 35   constructor; it defaults to true. Setting it to false allows code to manipulate
 36   the *allow_reuse_address* class variable before the address is bound.
 37
 38   .. versionchanged:: 2.5
 39      The *allow_none* and *encoding* parameters were added.
 40
 41   .. versionchanged:: 2.6
 42      The *bind_and_activate* parameter was added.
 43
 44
 45.. class:: CGIXMLRPCRequestHandler([allow_none[, encoding]])
 46
 47   Create a new instance to handle XML-RPC requests in a CGI environment.  The
 48   *allow_none* and *encoding* parameters are passed on to  :mod:`xmlrpclib` and
 49   control the XML-RPC responses that will be returned  from the server.
 50
 51   .. versionadded:: 2.3
 52
 53   .. versionchanged:: 2.5
 54      The *allow_none* and *encoding* parameters were added.
 55
 56
 57.. class:: SimpleXMLRPCRequestHandler()
 58
 59   Create a new request handler instance.  This request handler supports ``POST``
 60   requests and modifies logging so that the *logRequests* parameter to the
 61   :class:`SimpleXMLRPCServer` constructor parameter is honored.
 62
 63
 64.. _simple-xmlrpc-servers:
 65
 66SimpleXMLRPCServer Objects
 67--------------------------
 68
 69The :class:`SimpleXMLRPCServer` class is based on
 70:class:`SocketServer.TCPServer` and provides a means of creating simple, stand
 71alone XML-RPC servers.
 72
 73
 74.. method:: SimpleXMLRPCServer.register_function(function[, name])
 75
 76   Register a function that can respond to XML-RPC requests.  If *name* is given,
 77   it will be the method name associated with *function*, otherwise
 78   ``function.__name__`` will be used.  *name* can be either a normal or Unicode
 79   string, and may contain characters not legal in Python identifiers, including
 80   the period character.
 81
 82
 83.. method:: SimpleXMLRPCServer.register_instance(instance[, allow_dotted_names])
 84
 85   Register an object which is used to expose method names which have not been
 86   registered using :meth:`register_function`.  If *instance* contains a
 87   :meth:`_dispatch` method, it is called with the requested method name and the
 88   parameters from the request.  Its API is ``def _dispatch(self, method, params)``
 89   (note that *params* does not represent a variable argument list).  If it calls
 90   an underlying function to perform its task, that function is called as
 91   ``func(*params)``, expanding the parameter list. The return value from
 92   :meth:`_dispatch` is returned to the client as the result.  If *instance* does
 93   not have a :meth:`_dispatch` method, it is searched for an attribute matching
 94   the name of the requested method.
 95
 96   If the optional *allow_dotted_names* argument is true and the instance does not
 97   have a :meth:`_dispatch` method, then if the requested method name contains
 98   periods, each component of the method name is searched for individually, with
 99   the effect that a simple hierarchical search is performed.  The value found from
100   this search is then called with the parameters from the request, and the return
101   value is passed back to the client.
102
103   .. warning::
104
105      Enabling the *allow_dotted_names* option allows intruders to access your
106      module's global variables and may allow intruders to execute arbitrary code on
107      your machine.  Only use this option on a secure, closed network.
108
109   .. versionchanged:: 2.3.5, 2.4.1
110      *allow_dotted_names* was added to plug a security hole; prior versions are
111      insecure.
112
113
114.. method:: SimpleXMLRPCServer.register_introspection_functions()
115
116   Registers the XML-RPC introspection functions ``system.listMethods``,
117   ``system.methodHelp`` and ``system.methodSignature``.
118
119   .. versionadded:: 2.3
120
121
122.. method:: SimpleXMLRPCServer.register_multicall_functions()
123
124   Registers the XML-RPC multicall function system.multicall.
125
126
127.. attribute:: SimpleXMLRPCRequestHandler.rpc_paths
128
129   An attribute value that must be a tuple listing valid path portions of the URL
130   for receiving XML-RPC requests.  Requests posted to other paths will result in a
131   404 "no such page" HTTP error.  If this tuple is empty, all paths will be
132   considered valid. The default value is ``('/', '/RPC2')``.
133
134   .. versionadded:: 2.5
135
136.. _simplexmlrpcserver-example:
137
138SimpleXMLRPCServer Example
139^^^^^^^^^^^^^^^^^^^^^^^^^^
140Server code::
141
142   from SimpleXMLRPCServer import SimpleXMLRPCServer
143   from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
144
145   # Restrict to a particular path.
146   class RequestHandler(SimpleXMLRPCRequestHandler):
147       rpc_paths = ('/RPC2',)
148
149   # Create server
150   server = SimpleXMLRPCServer(("localhost", 8000),
151                               requestHandler=RequestHandler)
152   server.register_introspection_functions()
153
154   # Register pow() function; this will use the value of
155   # pow.__name__ as the name, which is just 'pow'.
156   server.register_function(pow)
157
158   # Register a function under a different name
159   def adder_function(x,y):
160       return x + y
161   server.register_function(adder_function, 'add')
162
163   # Register an instance; all the methods of the instance are
164   # published as XML-RPC methods (in this case, just 'div').
165   class MyFuncs:
166       def div(self, x, y):
167           return x // y
168
169   server.register_instance(MyFuncs())
170
171   # Run the server's main loop
172   server.serve_forever()
173
174The following client code will call the methods made available by the preceding
175server::
176
177   import xmlrpclib
178
179   s = xmlrpclib.ServerProxy('http://localhost:8000')
180   print s.pow(2,3)  # Returns 2**3 = 8
181   print s.add(2,3)  # Returns 5
182   print s.div(5,2)  # Returns 5//2 = 2
183
184   # Print list of available methods
185   print s.system.listMethods()
186
187
188CGIXMLRPCRequestHandler
189-----------------------
190
191The :class:`CGIXMLRPCRequestHandler` class can be used to  handle XML-RPC
192requests sent to Python CGI scripts.
193
194
195.. method:: CGIXMLRPCRequestHandler.register_function(function[, name])
196
197   Register a function that can respond to XML-RPC requests. If  *name* is given,
198   it will be the method name associated with  function, otherwise
199   *function.__name__* will be used. *name* can be either a normal or Unicode
200   string, and may contain  characters not legal in Python identifiers, including
201   the period character.
202
203
204.. method:: CGIXMLRPCRequestHandler.register_instance(instance)
205
206   Register an object which is used to expose method names  which have not been
207   registered using :meth:`register_function`. If  instance contains a
208   :meth:`_dispatch` method, it is called with the  requested method name and the
209   parameters from the  request; the return value is returned to the client as the
210   result. If instance does not have a :meth:`_dispatch` method, it is searched
211   for an attribute matching the name of the requested method; if  the requested
212   method name contains periods, each  component of the method name is searched for
213   individually,  with the effect that a simple hierarchical search is performed.
214   The value found from this search is then called with the  parameters from the
215   request, and the return value is passed  back to the client.
216
217
218.. method:: CGIXMLRPCRequestHandler.register_introspection_functions()
219
220   Register the XML-RPC introspection functions  ``system.listMethods``,
221   ``system.methodHelp`` and  ``system.methodSignature``.
222
223
224.. method:: CGIXMLRPCRequestHandler.register_multicall_functions()
225
226   Register the XML-RPC multicall function ``system.multicall``.
227
228
229.. method:: CGIXMLRPCRequestHandler.handle_request([request_text = None])
230
231   Handle a XML-RPC request. If *request_text* is given, it  should be the POST
232   data provided by the HTTP server,  otherwise the contents of stdin will be used.
233
234Example::
235
236   class MyFuncs:
237       def div(self, x, y) : return x // y
238
239
240   handler = CGIXMLRPCRequestHandler()
241   handler.register_function(pow)
242   handler.register_function(lambda x,y: x+y, 'add')
243   handler.register_introspection_functions()
244   handler.register_instance(MyFuncs())
245   handler.handle_request()
246