mirror of
https://github.com/python/cpython.git
synced 2024-11-28 12:31:14 +08:00
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.
|
|
|
|
This module can be used to create simple XML-RPC servers
|
|
by creating a server and either installing functions, a
|
|
class instance, or by extending the SimpleXMLRPCRequestHandler
|
|
class.
|
|
|
|
A list of possible usage patterns follows:
|
|
|
|
1. Install functions:
|
|
|
|
server = SimpleXMLRPCServer(("localhost", 8000))
|
|
server.register_function(pow)
|
|
server.register_function(lambda x,y: x+y, 'add')
|
|
server.serve_forever()
|
|
|
|
2. Install an instance:
|
|
|
|
class MyFuncs:
|
|
def __init__(self):
|
|
# make all of the string functions available through
|
|
# string.func_name
|
|
import string
|
|
self.string = string
|
|
def pow(self, x, y): return pow(x, y)
|
|
def add(self, x, y) : return x + y
|
|
server = SimpleXMLRPCServer(("localhost", 8000))
|
|
server.register_instance(MyFuncs())
|
|
server.serve_forever()
|
|
|
|
3. Install an instance with custom dispatch method:
|
|
|
|
class Math:
|
|
def _dispatch(self, method, params):
|
|
if method == 'pow':
|
|
return apply(pow, params)
|
|
elif method == 'add':
|
|
return params[0] + params[1]
|
|
else:
|
|
raise 'bad method'
|
|
server = SimpleXMLRPCServer(("localhost", 8000))
|
|
server.register_instance(Math())
|
|
server.serve_forever()
|
|
|
|
4. Subclass SimpleXMLRPCRequestHandler:
|
|
|
|
class MathHandler(SimpleXMLRPCRequestHandler):
|
|
def _dispatch(self, method, params):
|
|
try:
|
|
# We are forcing the 'export_' prefix on methods that are
|
|
# callable through XML-RPC to prevent potential security
|
|
# problems
|
|
func = getattr(self, 'export_' + method)
|
|
except AttributeError:
|
|
raise Exception('method "%s" is not supported' % method)
|
|
else:
|
|
return apply(func, params)
|
|
|
|
def log_message(self, format, *args):
|
|
pass # maybe do something fancy like write the messages to a file
|
|
|
|
def export_add(self, x, y):
|
|
return x + y
|
|
|
|
server = SimpleXMLRPCServer(("localhost", 8000), MathHandler)
|
|
server.serve_forever()
|
|
"""
|
|
|
|
# Written by Brian Quinlan (brian@sweetapp.com).
|
|
# Based on code written by Fredrik Lundh.
|
|
|
|
import xmlrpclib
|
|
import SocketServer
|
|
import BaseHTTPServer
|
|
import sys
|
|
|
|
class SimpleXMLRPCRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
|
|
"""Simple XML-RPC request handler class.
|
|
|
|
Handles all HTTP POST requests and attempts to decode them as
|
|
XML-RPC requests.
|
|
|
|
XML-RPC requests are dispatched to the _dispatch method, which
|
|
may be overriden by subclasses. The default implementation attempts
|
|
to dispatch XML-RPC calls to the functions or instance installed
|
|
in the server.
|
|
"""
|
|
|
|
def do_POST(self):
|
|
"""Handles the HTTP POST request.
|
|
|
|
Attempts to interpret all HTTP POST requests as XML-RPC calls,
|
|
which are forwarded to the _dispatch method for handling.
|
|
"""
|
|
|
|
try:
|
|
# get arguments
|
|
data = self.rfile.read(int(self.headers["content-length"]))
|
|
params, method = xmlrpclib.loads(data)
|
|
|
|
# generate response
|
|
try:
|
|
response = self._dispatch(method, params)
|
|
# wrap response in a singleton tuple
|
|
response = (response,)
|
|
except:
|
|
# report exception back to server
|
|
response = xmlrpclib.dumps(
|
|
xmlrpclib.Fault(1, "%s:%s" % (sys.exc_type, sys.exc_value))
|
|
)
|
|
else:
|
|
response = xmlrpclib.dumps(response, methodresponse=1)
|
|
except:
|
|
# internal error, report as HTTP server error
|
|
self.send_response(500)
|
|
self.end_headers()
|
|
else:
|
|
# got a valid XML RPC response
|
|
self.send_response(200)
|
|
self.send_header("Content-type", "text/xml")
|
|
self.send_header("Content-length", str(len(response)))
|
|
self.end_headers()
|
|
self.wfile.write(response)
|
|
|
|
# shut down the connection
|
|
self.wfile.flush()
|
|
self.connection.shutdown(1)
|
|
|
|
def _dispatch(self, method, params):
|
|
"""Dispatches the XML-RPC method.
|
|
|
|
XML-RPC calls are forwarded to a registered function that
|
|
matches the called XML-RPC method name. If no such function
|
|
exists then the call is forwarded to the registered instance,
|
|
if available.
|
|
|
|
If the registered instance has a _dispatch method then that
|
|
method will be called with the name of the XML-RPC method and
|
|
it's parameters as a tuple
|
|
e.g. instance._dispatch('add',(2,3))
|
|
|
|
If the registered instance does not have a _dispatch method
|
|
then the instance will be searched to find a matching method
|
|
and, if found, will be called.
|
|
|
|
Methods beginning with an '_' are considered private and will
|
|
not be called by SimpleXMLRPCServer.
|
|
"""
|
|
|
|
func = None
|
|
try:
|
|
# check to see if a matching function has been registered
|
|
func = self.server.funcs[method]
|
|
except KeyError:
|
|
if self.server.instance is not None:
|
|
# check for a _dispatch method
|
|
if hasattr(self.server.instance, '_dispatch'):
|
|
return self.server.instance._dispatch(method, params)
|
|
else:
|
|
# call instance method directly
|
|
try:
|
|
func = _resolve_dotted_attribute(
|
|
self.server.instance,
|
|
method
|
|
)
|
|
except AttributeError:
|
|
pass
|
|
|
|
if func is not None:
|
|
return apply(func, params)
|
|
else:
|
|
raise Exception('method "%s" is not supported' % method)
|
|
|
|
def log_request(self, code='-', size='-'):
|
|
"""Selectively log an accepted request."""
|
|
|
|
if self.server.logRequests:
|
|
BaseHTTPServer.BaseHTTPRequestHandler.log_request(self, code, size)
|
|
|
|
|
|
def _resolve_dotted_attribute(obj, attr):
|
|
"""Resolves a dotted attribute name to an object. Raises
|
|
an AttributeError if any attribute in the chain starts with a '_'.
|
|
"""
|
|
for i in attr.split('.'):
|
|
if i.startswith('_'):
|
|
raise AttributeError(
|
|
'attempt to access private attribute "%s"' % i
|
|
)
|
|
else:
|
|
obj = getattr(obj,i)
|
|
return obj
|
|
|
|
|
|
class SimpleXMLRPCServer(SocketServer.TCPServer):
|
|
"""Simple XML-RPC server.
|
|
|
|
Simple XML-RPC server that allows functions and a single instance
|
|
to be installed to handle requests.
|
|
"""
|
|
|
|
def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler,
|
|
logRequests=1):
|
|
self.funcs = {}
|
|
self.logRequests = logRequests
|
|
self.instance = None
|
|
SocketServer.TCPServer.__init__(self, addr, requestHandler)
|
|
|
|
def register_instance(self, instance):
|
|
"""Registers an instance to respond to XML-RPC requests.
|
|
|
|
Only one instance can be installed at a time.
|
|
|
|
If the registered instance has a _dispatch method then that
|
|
method will be called with the name of the XML-RPC method and
|
|
it's parameters as a tuple
|
|
e.g. instance._dispatch('add',(2,3))
|
|
|
|
If the registered instance does not have a _dispatch method
|
|
then the instance will be searched to find a matching method
|
|
and, if found, will be called.
|
|
|
|
Methods beginning with an '_' are considered private and will
|
|
not be called by SimpleXMLRPCServer.
|
|
|
|
If a registered function matches a XML-RPC request, then it
|
|
will be called instead of the registered instance.
|
|
"""
|
|
|
|
self.instance = instance
|
|
|
|
def register_function(self, function, name = None):
|
|
"""Registers a function to respond to XML-RPC requests.
|
|
|
|
The optional name argument can be used to set a Unicode name
|
|
for the function.
|
|
|
|
If an instance is also registered then it will only be called
|
|
if a matching function is not found.
|
|
"""
|
|
|
|
if name is None:
|
|
name = function.__name__
|
|
self.funcs[name] = function
|
|
|
|
if __name__ == '__main__':
|
|
server = SimpleXMLRPCServer(("localhost", 8000))
|
|
server.register_function(pow)
|
|
server.register_function(lambda x,y: x+y, 'add')
|
|
server.serve_forever()
|