Create xmlrpc package. Issue #2886.

1 files changed, 868 insertions, 0 deletions

diff --git a/Lib/xmlrpc/server.py b/Lib/xmlrpc/server.py
new file mode 100644
index 0000000..9668c8c
--- /dev/null
+++ b/Lib/xmlrpc/server.py
@@ -0,0 +1,868 @@
+"""XML-RPC Servers.
+
+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 SimpleXMLRPCServer
+class.
+
+It can also be used to handle XML-RPC requests in a CGI
+environment using CGIXMLRPCRequestHandler.
+
+The Doc* classes can be used to create XML-RPC servers that
+serve pydoc-style documentation in response to HTTP
+GET requests. This documentation is dynamically generated
+based on the functions and methods registered with the
+server.
+
+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 sys functions available through sys.func_name
+        import sys
+        self.sys = sys
+    def _listMethods(self):
+        # implement this method so that system.listMethods
+        # knows to advertise the sys methods
+        return list_public_methods(self) + \
+                ['sys.' + method for method in list_public_methods(self.sys)]
+    def pow(self, x, y): return pow(x, y)
+    def add(self, x, y) : return x + y
+
+server = SimpleXMLRPCServer(("localhost", 8000))
+server.register_introspection_functions()
+server.register_instance(MyFuncs())
+server.serve_forever()
+
+3. Install an instance with custom dispatch method:
+
+class Math:
+    def _listMethods(self):
+        # this method must be present for system.listMethods
+        # to work
+        return ['add', 'pow']
+    def _methodHelp(self, method):
+        # this method must be present for system.methodHelp
+        # to work
+        if method == 'add':
+            return "add(2,3) => 5"
+        elif method == 'pow':
+            return "pow(x, y[, z]) => number"
+        else:
+            # By convention, return empty
+            # string if no help is available
+            return ""
+    def _dispatch(self, method, params):
+        if method == 'pow':
+            return pow(*params)
+        elif method == 'add':
+            return params[0] + params[1]
+        else:
+            raise 'bad method'
+
+server = SimpleXMLRPCServer(("localhost", 8000))
+server.register_introspection_functions()
+server.register_instance(Math())
+server.serve_forever()
+
+4. Subclass SimpleXMLRPCServer:
+
+class MathServer(SimpleXMLRPCServer):
+    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 func(*params)
+
+    def export_add(self, x, y):
+        return x + y
+
+server = MathServer(("localhost", 8000))
+server.serve_forever()
+
+5. CGI script:
+
+server = CGIXMLRPCRequestHandler()
+server.register_function(pow)
+server.handle_request()
+"""
+
+# Written by Brian Quinlan (brian@sweetapp.com).
+# Based on code written by Fredrik Lundh.
+
+from xmlrpc.client import Fault, dumps, loads
+import socketserver
+import BaseHTTPServer
+import sys
+import os
+import re
+import pydoc
+import inspect
+import traceback
+try:
+    import fcntl
+except ImportError:
+    fcntl = None
+
+def resolve_dotted_attribute(obj, attr, allow_dotted_names=True):
+    """resolve_dotted_attribute(a, 'b.c.d') => a.b.c.d
+
+    Resolves a dotted attribute name to an object.  Raises
+    an AttributeError if any attribute in the chain starts with a '_'.
+
+    If the optional allow_dotted_names argument is false, dots are not
+    supported and this function operates similar to getattr(obj, attr).
+    """
+
+    if allow_dotted_names:
+        attrs = attr.split('.')
+    else:
+        attrs = [attr]
+
+    for i in attrs:
+        if i.startswith('_'):
+            raise AttributeError(
+                'attempt to access private attribute "%s"' % i
+                )
+        else:
+            obj = getattr(obj,i)
+    return obj
+
+def list_public_methods(obj):
+    """Returns a list of attribute strings, found in the specified
+    object, which represent callable attributes"""
+
+    return [member for member in dir(obj)
+                if not member.startswith('_') and
+                    hasattr(getattr(obj, member), '__call__')]
+
+class SimpleXMLRPCDispatcher:
+    """Mix-in class that dispatches XML-RPC requests.
+
+    This class is used to register XML-RPC method handlers
+    and then to dispatch them. There should never be any
+    reason to instantiate this class directly.
+    """
+
+    def __init__(self, allow_none, encoding):
+        self.funcs = {}
+        self.instance = None
+        self.allow_none = allow_none
+        self.encoding = encoding
+
+    def register_instance(self, instance, allow_dotted_names=False):
+        """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
+        its 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.
+
+        If the optional allow_dotted_names argument is true and the
+        instance does not have a _dispatch method, method names
+        containing dots are supported and resolved, as long as none of
+        the name segments start with an '_'.
+
+            *** SECURITY WARNING: ***
+
+            Enabling the allow_dotted_names options allows intruders
+            to access your module's global variables and may allow
+            intruders to execute arbitrary code on your machine.  Only
+            use this option on a secure, closed network.
+
+        """
+
+        self.instance = instance
+        self.allow_dotted_names = allow_dotted_names
+
+    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 name is None:
+            name = function.__name__
+        self.funcs[name] = function
+
+    def register_introspection_functions(self):
+        """Registers the XML-RPC introspection methods in the system
+        namespace.
+
+        see http://xmlrpc.usefulinc.com/doc/reserved.html
+        """
+
+        self.funcs.update({'system.listMethods' : self.system_listMethods,
+                      'system.methodSignature' : self.system_methodSignature,
+                      'system.methodHelp' : self.system_methodHelp})
+
+    def register_multicall_functions(self):
+        """Registers the XML-RPC multicall method in the system
+        namespace.
+
+        see http://www.xmlrpc.com/discuss/msgReader$1208"""
+
+        self.funcs.update({'system.multicall' : self.system_multicall})
+
+    def _marshaled_dispatch(self, data, dispatch_method = None):
+        """Dispatches an XML-RPC method from marshalled (XML) data.
+
+        XML-RPC methods are dispatched from the marshalled (XML) data
+        using the _dispatch method and the result is returned as
+        marshalled data. For backwards compatibility, a dispatch
+        function can be provided as an argument (see comment in
+        SimpleXMLRPCRequestHandler.do_POST) but overriding the
+        existing method through subclassing is the prefered means
+        of changing method dispatch behavior.
+        """
+
+        try:
+            params, method = loads(data)
+
+            # generate response
+            if dispatch_method is not None:
+                response = dispatch_method(method, params)
+            else:
+                response = self._dispatch(method, params)
+            # wrap response in a singleton tuple
+            response = (response,)
+            response = dumps(response, methodresponse=1,
+                             allow_none=self.allow_none, encoding=self.encoding)
+        except Fault as fault:
+            response = dumps(fault, allow_none=self.allow_none,
+                             encoding=self.encoding)
+        except:
+            # report exception back to server
+            exc_type, exc_value, exc_tb = sys.exc_info()
+            response = dumps(
+                Fault(1, "%s:%s" % (exc_type, exc_value)),
+                encoding=self.encoding, allow_none=self.allow_none,
+                )
+
+        return response
+
+    def system_listMethods(self):
+        """system.listMethods() => ['add', 'subtract', 'multiple']
+
+        Returns a list of the methods supported by the server."""
+
+        methods = set(self.funcs.keys())
+        if self.instance is not None:
+            # Instance can implement _listMethod to return a list of
+            # methods
+            if hasattr(self.instance, '_listMethods'):
+                methods |= set(self.instance._listMethods())
+            # if the instance has a _dispatch method then we
+            # don't have enough information to provide a list
+            # of methods
+            elif not hasattr(self.instance, '_dispatch'):
+                methods |= set(list_public_methods(self.instance))
+        return sorted(methods)
+
+    def system_methodSignature(self, method_name):
+        """system.methodSignature('add') => [double, int, int]
+
+        Returns a list describing the signature of the method. In the
+        above example, the add method takes two integers as arguments
+        and returns a double result.
+
+        This server does NOT support system.methodSignature."""
+
+        # See http://xmlrpc.usefulinc.com/doc/sysmethodsig.html
+
+        return 'signatures not supported'
+
+    def system_methodHelp(self, method_name):
+        """system.methodHelp('add') => "Adds two integers together"
+
+        Returns a string containing documentation for the specified method."""
+
+        method = None
+        if method_name in self.funcs:
+            method = self.funcs[method_name]
+        elif self.instance is not None:
+            # Instance can implement _methodHelp to return help for a method
+            if hasattr(self.instance, '_methodHelp'):
+                return self.instance._methodHelp(method_name)
+            # if the instance has a _dispatch method then we
+            # don't have enough information to provide help
+            elif not hasattr(self.instance, '_dispatch'):
+                try:
+                    method = resolve_dotted_attribute(
+                                self.instance,
+                                method_name,
+                                self.allow_dotted_names
+                                )
+                except AttributeError:
+                    pass
+
+        # Note that we aren't checking that the method actually
+        # be a callable object of some kind
+        if method is None:
+            return ""
+        else:
+            import pydoc
+            return pydoc.getdoc(method)
+
+    def system_multicall(self, call_list):
+        """system.multicall([{'methodName': 'add', 'params': [2, 2]}, ...]) => \
+[[4], ...]
+
+        Allows the caller to package multiple XML-RPC calls into a single
+        request.
+
+        See http://www.xmlrpc.com/discuss/msgReader$1208
+        """
+
+        results = []
+        for call in call_list:
+            method_name = call['methodName']
+            params = call['params']
+
+            try:
+                # XXX A marshalling error in any response will fail the entire
+                # multicall. If someone cares they should fix this.
+                results.append([self._dispatch(method_name, params)])
+            except Fault as fault:
+                results.append(
+                    {'faultCode' : fault.faultCode,
+                     'faultString' : fault.faultString}
+                    )
+            except:
+                exc_type, exc_value, exc_tb = sys.exc_info()
+                results.append(
+                    {'faultCode' : 1,
+                     'faultString' : "%s:%s" % (exc_type, exc_value)}
+                    )
+        return results
+
+    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
+        its 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.
+        """
+
+        func = None
+        try:
+            # check to see if a matching function has been registered
+            func = self.funcs[method]
+        except KeyError:
+            if self.instance is not None:
+                # check for a _dispatch method
+                if hasattr(self.instance, '_dispatch'):
+                    return self.instance._dispatch(method, params)
+                else:
+                    # call instance method directly
+                    try:
+                        func = resolve_dotted_attribute(
+                            self.instance,
+                            method,
+                            self.allow_dotted_names
+                            )
+                    except AttributeError:
+                        pass
+
+        if func is not None:
+            return func(*params)
+        else:
+            raise Exception('method "%s" is not supported' % method)
+
+class SimpleXMLRPCRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+    """Simple XML-RPC request handler class.
+
+    Handles all HTTP POST requests and attempts to decode them as
+    XML-RPC requests.
+    """
+
+    # Class attribute listing the accessible path components;
+    # paths not on this list will result in a 404 error.
+    rpc_paths = ('/', '/RPC2')
+
+    def is_rpc_path_valid(self):
+        if self.rpc_paths:
+            return self.path in self.rpc_paths
+        else:
+            # If .rpc_paths is empty, just assume all paths are legal
+            return True
+
+    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 server's _dispatch method for handling.
+        """
+
+        # Check that the path is legal
+        if not self.is_rpc_path_valid():
+            self.report_404()
+            return
+
+        try:
+            # Get arguments by reading body of request.
+            # We read this in chunks to avoid straining
+            # socket.read(); around the 10 or 15Mb mark, some platforms
+            # begin to have problems (bug #792570).
+            max_chunk_size = 10*1024*1024
+            size_remaining = int(self.headers["content-length"])
+            L = []
+            while size_remaining:
+                chunk_size = min(size_remaining, max_chunk_size)
+                L.append(self.rfile.read(chunk_size))
+                size_remaining -= len(L[-1])
+            data = b''.join(L)
+
+            # In previous versions of SimpleXMLRPCServer, _dispatch
+            # could be overridden in this class, instead of in
+            # SimpleXMLRPCDispatcher. To maintain backwards compatibility,
+            # check to see if a subclass implements _dispatch and dispatch
+            # using that method if present.
+            response = self.server._marshaled_dispatch(
+                    data, getattr(self, '_dispatch', None)
+                )
+        except Exception as e: # This should only happen if the module is buggy
+            # internal error, report as HTTP server error
+            self.send_response(500)
+
+            # Send information about the exception if requested
+            if hasattr(self.server, '_send_traceback_header') and \
+                    self.server._send_traceback_header:
+                self.send_header("X-exception", str(e))
+                self.send_header("X-traceback", traceback.format_exc())
+
+            self.end_headers()
+        else:
+            # Got a valid XML RPC response; convert to bytes first
+            response = response.encode("utf-8")
+            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 report_404 (self):
+            # Report a 404 error
+        self.send_response(404)
+        response = b'No such page'
+        self.send_header("Content-type", "text/plain")
+        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 log_request(self, code='-', size='-'):
+        """Selectively log an accepted request."""
+
+        if self.server.logRequests:
+            BaseHTTPServer.BaseHTTPRequestHandler.log_request(self, code, size)
+
+class SimpleXMLRPCServer(socketserver.TCPServer,
+                         SimpleXMLRPCDispatcher):
+    """Simple XML-RPC server.
+
+    Simple XML-RPC server that allows functions and a single instance
+    to be installed to handle requests. The default implementation
+    attempts to dispatch XML-RPC calls to the functions or instance
+    installed in the server. Override the _dispatch method inhereted
+    from SimpleXMLRPCDispatcher to change this behavior.
+    """
+
+    allow_reuse_address = True
+
+    # Warning: this is for debugging purposes only! Never set this to True in
+    # production code, as will be sending out sensitive information (exception
+    # and stack trace details) when exceptions are raised inside
+    # SimpleXMLRPCRequestHandler.do_POST
+    _send_traceback_header = False
+
+    def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler,
+                 logRequests=True, allow_none=False, encoding=None, bind_and_activate=True):
+        self.logRequests = logRequests
+
+        SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding)
+        socketserver.TCPServer.__init__(self, addr, requestHandler, bind_and_activate)
+
+        # [Bug #1222790] If possible, set close-on-exec flag; if a
+        # method spawns a subprocess, the subprocess shouldn't have
+        # the listening socket open.
+        if fcntl is not None and hasattr(fcntl, 'FD_CLOEXEC'):
+            flags = fcntl.fcntl(self.fileno(), fcntl.F_GETFD)
+            flags |= fcntl.FD_CLOEXEC
+            fcntl.fcntl(self.fileno(), fcntl.F_SETFD, flags)
+
+class CGIXMLRPCRequestHandler(SimpleXMLRPCDispatcher):
+    """Simple handler for XML-RPC data passed through CGI."""
+
+    def __init__(self, allow_none=False, encoding=None):
+        SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding)
+
+    def handle_xmlrpc(self, request_text):
+        """Handle a single XML-RPC request"""
+
+        response = self._marshaled_dispatch(request_text)
+
+        print('Content-Type: text/xml')
+        print('Content-Length: %d' % len(response))
+        print()
+        sys.stdout.write(response)
+
+    def handle_get(self):
+        """Handle a single HTTP GET request.
+
+        Default implementation indicates an error because
+        XML-RPC uses the POST method.
+        """
+
+        code = 400
+        message, explain = \
+                 BaseHTTPServer.BaseHTTPRequestHandler.responses[code]
+
+        response = BaseHTTPServer.DEFAULT_ERROR_MESSAGE % \
+            {
+             'code' : code,
+             'message' : message,
+             'explain' : explain
+            }
+        print('Status: %d %s' % (code, message))
+        print('Content-Type: text/html')
+        print('Content-Length: %d' % len(response))
+        print()
+        sys.stdout.write(response)
+
+    def handle_request(self, request_text = None):
+        """Handle a single XML-RPC request passed through a CGI post method.
+
+        If no XML data is given then it is read from stdin. The resulting
+        XML-RPC response is printed to stdout along with the correct HTTP
+        headers.
+        """
+
+        if request_text is None and \
+            os.environ.get('REQUEST_METHOD', None) == 'GET':
+            self.handle_get()
+        else:
+            # POST data is normally available through stdin
+            if request_text is None:
+                request_text = sys.stdin.read()
+
+            self.handle_xmlrpc(request_text)
+
+
+# -----------------------------------------------------------------------------
+# Self documenting XML-RPC Server.
+
+class ServerHTMLDoc(pydoc.HTMLDoc):
+    """Class used to generate pydoc HTML document for a server"""
+
+    def markup(self, text, escape=None, funcs={}, classes={}, methods={}):
+        """Mark up some plain text, given a context of symbols to look for.
+        Each context dictionary maps object names to anchor names."""
+        escape = escape or self.escape
+        results = []
+        here = 0
+
+        # XXX Note that this regular expression does not allow for the
+        # hyperlinking of arbitrary strings being used as method
+        # names. Only methods with names consisting of word characters
+        # and '.'s are hyperlinked.
+        pattern = re.compile(r'\b((http|ftp)://\S+[\w/]|'
+                                r'RFC[- ]?(\d+)|'
+                                r'PEP[- ]?(\d+)|'
+                                r'(self\.)?((?:\w|\.)+))\b')
+        while 1:
+            match = pattern.search(text, here)
+            if not match: break
+            start, end = match.span()
+            results.append(escape(text[here:start]))
+
+            all, scheme, rfc, pep, selfdot, name = match.groups()
+            if scheme:
+                url = escape(all).replace('"', '"')
+                results.append('<a href="%s">%s</a>' % (url, url))
+            elif rfc:
+                url = 'http://www.rfc-editor.org/rfc/rfc%d.txt' % int(rfc)
+                results.append('<a href="%s">%s</a>' % (url, escape(all)))
+            elif pep:
+                url = 'http://www.python.org/dev/peps/pep-%04d/' % int(pep)
+                results.append('<a href="%s">%s</a>' % (url, escape(all)))
+            elif text[end:end+1] == '(':
+                results.append(self.namelink(name, methods, funcs, classes))
+            elif selfdot:
+                results.append('self.<strong>%s</strong>' % name)
+            else:
+                results.append(self.namelink(name, classes))
+            here = end
+        results.append(escape(text[here:]))
+        return ''.join(results)
+
+    def docroutine(self, object, name, mod=None,
+                   funcs={}, classes={}, methods={}, cl=None):
+        """Produce HTML documentation for a function or method object."""
+
+        anchor = (cl and cl.__name__ or '') + '-' + name
+        note = ''
+
+        title = '<a name="%s"><strong>%s</strong></a>' % (
+            self.escape(anchor), self.escape(name))
+
+        if inspect.ismethod(object):
+            args, varargs, varkw, defaults = inspect.getargspec(object)
+            # exclude the argument bound to the instance, it will be
+            # confusing to the non-Python user
+            argspec = inspect.formatargspec (
+                    args[1:],
+                    varargs,
+                    varkw,
+                    defaults,
+                    formatvalue=self.formatvalue
+                )
+        elif inspect.isfunction(object):
+            args, varargs, varkw, defaults = inspect.getargspec(object)
+            argspec = inspect.formatargspec(
+                args, varargs, varkw, defaults, formatvalue=self.formatvalue)
+        else:
+            argspec = '(...)'
+
+        if isinstance(object, tuple):
+            argspec = object[0] or argspec
+            docstring = object[1] or ""
+        else:
+            docstring = pydoc.getdoc(object)
+
+        decl = title + argspec + (note and self.grey(
+               '<font face="helvetica, arial">%s</font>' % note))
+
+        doc = self.markup(
+            docstring, self.preformat, funcs, classes, methods)
+        doc = doc and '<dd><tt>%s</tt></dd>' % doc
+        return '<dl><dt>%s</dt>%s</dl>\n' % (decl, doc)
+
+    def docserver(self, server_name, package_documentation, methods):
+        """Produce HTML documentation for an XML-RPC server."""
+
+        fdict = {}
+        for key, value in methods.items():
+            fdict[key] = '#-' + key
+            fdict[value] = fdict[key]
+
+        server_name = self.escape(server_name)
+        head = '<big><big><strong>%s</strong></big></big>' % server_name
+        result = self.heading(head, '#ffffff', '#7799ee')
+
+        doc = self.markup(package_documentation, self.preformat, fdict)
+        doc = doc and '<tt>%s</tt>' % doc
+        result = result + '<p>%s</p>\n' % doc
+
+        contents = []
+        method_items = sorted(methods.items())
+        for key, value in method_items:
+            contents.append(self.docroutine(value, key, funcs=fdict))
+        result = result + self.bigsection(
+            'Methods', '#ffffff', '#eeaa77', ''.join(contents))
+
+        return result
+
+class XMLRPCDocGenerator:
+    """Generates documentation for an XML-RPC server.
+
+    This class is designed as mix-in and should not
+    be constructed directly.
+    """
+
+    def __init__(self):
+        # setup variables used for HTML documentation
+        self.server_name = 'XML-RPC Server Documentation'
+        self.server_documentation = \
+            "This server exports the following methods through the XML-RPC "\
+            "protocol."
+        self.server_title = 'XML-RPC Server Documentation'
+
+    def set_server_title(self, server_title):
+        """Set the HTML title of the generated server documentation"""
+
+        self.server_title = server_title
+
+    def set_server_name(self, server_name):
+        """Set the name of the generated HTML server documentation"""
+
+        self.server_name = server_name
+
+    def set_server_documentation(self, server_documentation):
+        """Set the documentation string for the entire server."""
+
+        self.server_documentation = server_documentation
+
+    def generate_html_documentation(self):
+        """generate_html_documentation() => html documentation for the server
+
+        Generates HTML documentation for the server using introspection for
+        installed functions and instances that do not implement the
+        _dispatch method. Alternatively, instances can choose to implement
+        the _get_method_argstring(method_name) method to provide the
+        argument string used in the documentation and the
+        _methodHelp(method_name) method to provide the help text used
+        in the documentation."""
+
+        methods = {}
+
+        for method_name in self.system_listMethods():
+            if method_name in self.funcs:
+                method = self.funcs[method_name]
+            elif self.instance is not None:
+                method_info = [None, None] # argspec, documentation
+                if hasattr(self.instance, '_get_method_argstring'):
+                    method_info[0] = self.instance._get_method_argstring(method_name)
+                if hasattr(self.instance, '_methodHelp'):
+                    method_info[1] = self.instance._methodHelp(method_name)
+
+                method_info = tuple(method_info)
+                if method_info != (None, None):
+                    method = method_info
+                elif not hasattr(self.instance, '_dispatch'):
+                    try:
+                        method = resolve_dotted_attribute(
+                                    self.instance,
+                                    method_name
+                                    )
+                    except AttributeError:
+                        method = method_info
+                else:
+                    method = method_info
+            else:
+                assert 0, "Could not find method in self.functions and no "\
+                          "instance installed"
+
+            methods[method_name] = method
+
+        documenter = ServerHTMLDoc()
+        documentation = documenter.docserver(
+                                self.server_name,
+                                self.server_documentation,
+                                methods
+                            )
+
+        return documenter.page(self.server_title, documentation)
+
+class DocXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
+    """XML-RPC and documentation request handler class.
+
+    Handles all HTTP POST requests and attempts to decode them as
+    XML-RPC requests.
+
+    Handles all HTTP GET requests and interprets them as requests
+    for documentation.
+    """
+
+    def do_GET(self):
+        """Handles the HTTP GET request.
+
+        Interpret all HTTP GET requests as requests for server
+        documentation.
+        """
+        # Check that the path is legal
+        if not self.is_rpc_path_valid():
+            self.report_404()
+            return
+
+        response = self.server.generate_html_documentation()
+        self.send_response(200)
+        self.send_header("Content-type", "text/html")
+        self.send_header("Content-length", str(len(response)))
+        self.end_headers()
+        self.wfile.write(response.encode())
+
+        # shut down the connection
+        self.wfile.flush()
+        self.connection.shutdown(1)
+
+class DocXMLRPCServer(  SimpleXMLRPCServer,
+                        XMLRPCDocGenerator):
+    """XML-RPC and HTML documentation server.
+
+    Adds the ability to serve server documentation to the capabilities
+    of SimpleXMLRPCServer.
+    """
+
+    def __init__(self, addr, requestHandler=DocXMLRPCRequestHandler,
+                 logRequests=1, allow_none=False, encoding=None,
+                 bind_and_activate=True):
+        SimpleXMLRPCServer.__init__(self, addr, requestHandler, logRequests,
+                                    allow_none, encoding, bind_and_activate)
+        XMLRPCDocGenerator.__init__(self)
+
+class DocCGIXMLRPCRequestHandler(   CGIXMLRPCRequestHandler,
+                                    XMLRPCDocGenerator):
+    """Handler for XML-RPC data and documentation requests passed through
+    CGI"""
+
+    def handle_get(self):
+        """Handles the HTTP GET request.
+
+        Interpret all HTTP GET requests as requests for server
+        documentation.
+        """
+
+        response = self.generate_html_documentation()
+
+        print('Content-Type: text/html')
+        print('Content-Length: %d' % len(response))
+        print()
+        sys.stdout.write(response)
+
+    def __init__(self):
+        CGIXMLRPCRequestHandler.__init__(self)
+        XMLRPCDocGenerator.__init__(self)
+
+
+if __name__ == '__main__':
+    print('Running XML-RPC server on port 8000')
+    server = SimpleXMLRPCServer(("localhost", 8000))
+    server.register_function(pow)
+    server.register_function(lambda x,y: x+y, 'add')
+    server.serve_forever()