| r"""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 SimpleXMLRPCServer |
| class. |
| |
| It can also be used to handle XML-RPC requests in a CGI |
| environment using CGIXMLRPCRequestHandler. |
| |
| 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 _listMethods(self): |
| # implement this method so that system.listMethods |
| # knows to advertise the strings methods |
| return list_public_methods(self) + \ |
| ['string.' + method for method in list_public_methods(self.string)] |
| 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. |
| |
| import xmlrpclib |
| from xmlrpclib import Fault |
| import SocketServer |
| import BaseHTTPServer |
| import sys |
| import os |
| import traceback |
| import re |
| 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__')] |
| |
| def remove_duplicates(lst): |
| """remove_duplicates([2,2,2,1,3,3]) => [3,1,2] |
| |
| Returns a copy of a list without duplicates. Every list |
| item must be hashable and the order of the items in the |
| resulting list is not defined. |
| """ |
| u = {} |
| for x in lst: |
| u[x] = 1 |
| |
| return u.keys() |
| |
| 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. This class doesn't need to be |
| instanced directly when used by SimpleXMLRPCServer but it |
| can be instanced when used by the MultiPathXMLRPCServer. |
| """ |
| |
| def __init__(self, allow_none=False, encoding=None): |
| 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, path = 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 preferred means |
| of changing method dispatch behavior. |
| """ |
| |
| try: |
| params, method = xmlrpclib.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 = xmlrpclib.dumps(response, methodresponse=1, |
| allow_none=self.allow_none, encoding=self.encoding) |
| except Fault, fault: |
| response = xmlrpclib.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 = xmlrpclib.dumps( |
| xmlrpclib.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 = 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 = remove_duplicates( |
| methods + 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 = remove_duplicates( |
| methods + list_public_methods(self.instance) |
| ) |
| methods.sort() |
| return 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, 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') |
| |
| #if not None, encode responses larger than this, if possible |
| encode_threshold = 1400 #a common MTU |
| |
| #Override form StreamRequestHandler: full buffering of output |
| #and no Nagle. |
| wbufsize = -1 |
| disable_nagle_algorithm = True |
| |
| # a re to match a gzip Accept-Encoding |
| aepattern = re.compile(r""" |
| \s* ([^\s;]+) \s* #content-coding |
| (;\s* q \s*=\s* ([0-9\.]+))? #q |
| """, re.VERBOSE | re.IGNORECASE) |
| |
| def accept_encodings(self): |
| r = {} |
| ae = self.headers.get("Accept-Encoding", "") |
| for e in ae.split(","): |
| match = self.aepattern.match(e) |
| if match: |
| v = match.group(3) |
| v = float(v) if v else 1.0 |
| r[match.group(1)] = v |
| return r |
| |
| 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) |
| chunk = self.rfile.read(chunk_size) |
| if not chunk: |
| break |
| L.append(chunk) |
| size_remaining -= len(L[-1]) |
| data = ''.join(L) |
| |
| data = self.decode_request_content(data) |
| if data is None: |
| return #response has been sent |
| |
| # 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), self.path |
| ) |
| except Exception, 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.send_header("Content-length", "0") |
| self.end_headers() |
| else: |
| # got a valid XML RPC response |
| self.send_response(200) |
| self.send_header("Content-type", "text/xml") |
| if self.encode_threshold is not None: |
| if len(response) > self.encode_threshold: |
| q = self.accept_encodings().get("gzip", 0) |
| if q: |
| try: |
| response = xmlrpclib.gzip_encode(response) |
| self.send_header("Content-Encoding", "gzip") |
| except NotImplementedError: |
| pass |
| self.send_header("Content-length", str(len(response))) |
| self.end_headers() |
| self.wfile.write(response) |
| |
| def decode_request_content(self, data): |
| #support gzip encoding of request |
| encoding = self.headers.get("content-encoding", "identity").lower() |
| if encoding == "identity": |
| return data |
| if encoding == "gzip": |
| try: |
| return xmlrpclib.gzip_decode(data) |
| except NotImplementedError: |
| self.send_response(501, "encoding %r not supported" % encoding) |
| except ValueError: |
| self.send_response(400, "error decoding gzip content") |
| else: |
| self.send_response(501, "encoding %r not supported" % encoding) |
| self.send_header("Content-length", "0") |
| self.end_headers() |
| |
| def report_404 (self): |
| # Report a 404 error |
| self.send_response(404) |
| response = '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) |
| |
| 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 MultiPathXMLRPCServer(SimpleXMLRPCServer): |
| """Multipath XML-RPC Server |
| This specialization of SimpleXMLRPCServer allows the user to create |
| multiple Dispatcher instances and assign them to different |
| HTTP request paths. This makes it possible to run two or more |
| 'virtual XML-RPC servers' at the same port. |
| Make sure that the requestHandler accepts the paths in question. |
| """ |
| def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler, |
| logRequests=True, allow_none=False, encoding=None, bind_and_activate=True): |
| |
| SimpleXMLRPCServer.__init__(self, addr, requestHandler, logRequests, allow_none, |
| encoding, bind_and_activate) |
| self.dispatchers = {} |
| self.allow_none = allow_none |
| self.encoding = encoding |
| |
| def add_dispatcher(self, path, dispatcher): |
| self.dispatchers[path] = dispatcher |
| return dispatcher |
| |
| def get_dispatcher(self, path): |
| return self.dispatchers[path] |
| |
| def _marshaled_dispatch(self, data, dispatch_method = None, path = None): |
| try: |
| response = self.dispatchers[path]._marshaled_dispatch( |
| data, dispatch_method, path) |
| except: |
| # report low level exception back to server |
| # (each dispatcher should have handled their own |
| # exceptions) |
| exc_type, exc_value = sys.exc_info()[:2] |
| response = xmlrpclib.dumps( |
| xmlrpclib.Fault(1, "%s:%s" % (exc_type, exc_value)), |
| encoding=self.encoding, allow_none=self.allow_none) |
| return response |
| |
| 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: %s' % BaseHTTPServer.DEFAULT_ERROR_CONTENT_TYPE |
| 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 |
| try: |
| length = int(os.environ.get('CONTENT_LENGTH', None)) |
| except (TypeError, ValueError): |
| length = -1 |
| if request_text is None: |
| request_text = sys.stdin.read(length) |
| |
| self.handle_xmlrpc(request_text) |
| |
| 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.register_multicall_functions() |
| server.serve_forever() |
