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787fd8cdeb
every time this gets called; move it out as a global helper function.
Simplify the call to the _dispatch() method of the registered instance.
251 lines
8.2 KiB
Python
251 lines
8.2 KiB
Python
"""Simple XML-RPC Server.
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This module can be used to create simple XML-RPC servers
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by creating a server and either installing functions, a
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class instance, or by extending the SimpleXMLRPCRequestHandler
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class.
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A list of possible usage patterns follows:
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1. Install functions:
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_function(pow)
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server.register_function(lambda x,y: x+y, 'add')
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server.serve_forever()
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2. Install an instance:
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class MyFuncs:
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def __init__(self):
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# make all of the string functions available through
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# string.func_name
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import string
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self.string = string
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def pow(self, x, y): return pow(x, y)
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def add(self, x, y) : return x + y
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_instance(MyFuncs())
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server.serve_forever()
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3. Install an instance with custom dispatch method:
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class Math:
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def _dispatch(self, method, params):
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if method == 'pow':
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return apply(pow, params)
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elif method == 'add':
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return params[0] + params[1]
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else:
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raise 'bad method'
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_instance(Math())
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server.serve_forever()
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4. Subclass SimpleXMLRPCRequestHandler:
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class MathHandler(SimpleXMLRPCRequestHandler):
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def _dispatch(self, method, params):
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try:
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# We are forcing the 'export_' prefix on methods that are
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# callable through XML-RPC to prevent potential security
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# problems
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func = getattr(self, 'export_' + method)
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except AttributeError:
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raise Exception('method "%s" is not supported' % method)
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else:
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return apply(func, params)
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def log_message(self, format, *args):
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pass # maybe do something fancy like write the messages to a file
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def export_add(self, x, y):
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return x + y
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server = SimpleXMLRPCServer(("localhost", 8000), MathHandler)
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server.serve_forever()
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"""
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# Written by Brian Quinlan (brian@sweetapp.com).
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# Based on code written by Fredrik Lundh.
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import xmlrpclib
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import SocketServer
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import BaseHTTPServer
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import sys
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class SimpleXMLRPCRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
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"""Simple XML-RPC request handler class.
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Handles all HTTP POST requests and attempts to decode them as
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XML-RPC requests.
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XML-RPC requests are dispatched to the _dispatch method, which
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may be overriden by subclasses. The default implementation attempts
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to dispatch XML-RPC calls to the functions or instance installed
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in the server.
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"""
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def do_POST(self):
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"""Handles the HTTP POST request.
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Attempts to interpret all HTTP POST requests as XML-RPC calls,
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which are forwarded to the _dispatch method for handling.
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"""
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try:
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# get arguments
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data = self.rfile.read(int(self.headers["content-length"]))
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params, method = xmlrpclib.loads(data)
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# generate response
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try:
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response = self._dispatch(method, params)
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# wrap response in a singleton tuple
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response = (response,)
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except:
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# report exception back to server
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response = xmlrpclib.dumps(
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xmlrpclib.Fault(1, "%s:%s" % (sys.exc_type, sys.exc_value))
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)
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else:
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response = xmlrpclib.dumps(response, methodresponse=1)
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except:
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# internal error, report as HTTP server error
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self.send_response(500)
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self.end_headers()
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else:
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# got a valid XML RPC response
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self.send_response(200)
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self.send_header("Content-type", "text/xml")
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self.send_header("Content-length", str(len(response)))
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self.end_headers()
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self.wfile.write(response)
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# shut down the connection
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self.wfile.flush()
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self.connection.shutdown(1)
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def _dispatch(self, method, params):
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"""Dispatches the XML-RPC method.
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XML-RPC calls are forwarded to a registered function that
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matches the called XML-RPC method name. If no such function
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exists then the call is forwarded to the registered instance,
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if available.
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If the registered instance has a _dispatch method then that
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method will be called with the name of the XML-RPC method and
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it's parameters as a tuple
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e.g. instance._dispatch('add',(2,3))
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If the registered instance does not have a _dispatch method
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then the instance will be searched to find a matching method
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and, if found, will be called.
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Methods beginning with an '_' are considered private and will
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not be called by SimpleXMLRPCServer.
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"""
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func = None
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try:
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# check to see if a matching function has been registered
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func = self.server.funcs[method]
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except KeyError:
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if self.server.instance is not None:
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# check for a _dispatch method
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if hasattr(self.server.instance, '_dispatch'):
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return self.server.instance._dispatch(method, params)
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else:
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# call instance method directly
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try:
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func = _resolve_dotted_attribute(
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self.server.instance,
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method
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)
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except AttributeError:
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pass
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if func is not None:
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return apply(func, params)
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else:
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raise Exception('method "%s" is not supported' % method)
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def log_request(self, code='-', size='-'):
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"""Selectively log an accepted request."""
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if self.server.logRequests:
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BaseHTTPServer.BaseHTTPRequestHandler.log_request(self, code, size)
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def _resolve_dotted_attribute(obj, attr):
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"""Resolves a dotted attribute name to an object. Raises
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an AttributeError if any attribute in the chain starts with a '_'.
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"""
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for i in attr.split('.'):
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if i.startswith('_'):
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raise AttributeError(
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'attempt to access private attribute "%s"' % i
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)
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else:
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obj = getattr(obj,i)
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return obj
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class SimpleXMLRPCServer(SocketServer.TCPServer):
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"""Simple XML-RPC server.
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Simple XML-RPC server that allows functions and a single instance
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to be installed to handle requests.
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"""
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def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler,
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logRequests=1):
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self.funcs = {}
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self.logRequests = logRequests
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self.instance = None
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SocketServer.TCPServer.__init__(self, addr, requestHandler)
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def register_instance(self, instance):
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"""Registers an instance to respond to XML-RPC requests.
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Only one instance can be installed at a time.
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If the registered instance has a _dispatch method then that
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method will be called with the name of the XML-RPC method and
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it's parameters as a tuple
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e.g. instance._dispatch('add',(2,3))
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If the registered instance does not have a _dispatch method
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then the instance will be searched to find a matching method
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and, if found, will be called.
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Methods beginning with an '_' are considered private and will
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not be called by SimpleXMLRPCServer.
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If a registered function matches a XML-RPC request, then it
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will be called instead of the registered instance.
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"""
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self.instance = instance
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def register_function(self, function, name = None):
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"""Registers a function to respond to XML-RPC requests.
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The optional name argument can be used to set a Unicode name
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for the function.
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If an instance is also registered then it will only be called
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if a matching function is not found.
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"""
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if name is None:
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name = function.__name__
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self.funcs[name] = function
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if __name__ == '__main__':
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_function(pow)
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server.register_function(lambda x,y: x+y, 'add')
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server.serve_forever()
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