# Copyright (C) 2006, Red Hat, Inc. # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. # pylint: disable-msg = W0221 import socket import threading import traceback import xmlrpclib import sys import httplib import gobject import SimpleXMLRPCServer import SocketServer RESULT_FAILED = 0 RESULT_SUCCESS = 1 __authinfos = {} def _add_authinfo(authinfo): __authinfos[threading.currentThread()] = authinfo def get_authinfo(): return __authinfos.get(threading.currentThread()) def _del_authinfo(): del __authinfos[threading.currentThread()] class GlibTCPServer(SocketServer.TCPServer): """GlibTCPServer Integrate socket accept into glib mainloop. """ allow_reuse_address = True request_queue_size = 20 def __init__(self, server_address, RequestHandlerClass): SocketServer.TCPServer.__init__(self, server_address, RequestHandlerClass) self.socket.setblocking(0) # Set nonblocking # Watch the listener socket for data gobject.io_add_watch(self.socket, gobject.IO_IN, self._handle_accept) def _handle_accept(self, source, condition): """Process incoming data on the server's socket by doing an accept() via handle_request().""" if not (condition & gobject.IO_IN): return True self.handle_request() return True class GlibXMLRPCRequestHandler(SimpleXMLRPCServer.SimpleXMLRPCRequestHandler): """ GlibXMLRPCRequestHandler The stock SimpleXMLRPCRequestHandler and server don't allow any way to pass the client's address and/or SSL certificate into the function that actually _processes_ the request. So we have to store it in a thread-indexed dict. """ def do_POST(self): _add_authinfo(self.client_address) try: SimpleXMLRPCServer.SimpleXMLRPCRequestHandler.do_POST(self) except socket.timeout: pass except socket.error, e: print "Error (%s): socket error - '%s'" % (self.client_address, e) except: print "Error while processing POST:" traceback.print_exc() _del_authinfo() class GlibXMLRPCServer(GlibTCPServer, SimpleXMLRPCServer.SimpleXMLRPCDispatcher): """GlibXMLRPCServer Use nonblocking sockets and handle the accept via glib rather than blocking on accept(). """ def __init__(self, addr, requestHandler=GlibXMLRPCRequestHandler, logRequests=0): self.logRequests = logRequests SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self) GlibTCPServer.__init__(self, addr, requestHandler) 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. """ params, method = xmlrpclib.loads(data) # generate response try: 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) except xmlrpclib.Fault, fault: response = xmlrpclib.dumps(fault) except: print "Exception while processing request:" traceback.print_exc() # report exception back to server response = xmlrpclib.dumps( xmlrpclib.Fault(1, "%s:%s" % (sys.exc_type, sys.exc_value)) ) return response class GlibHTTP(httplib.HTTP): """Subclass HTTP so we can return it's connection class' socket.""" def connect(self, host=None, port=None): httplib.HTTP.connect(self, host, port) self._conn.sock.setblocking(0) def get_sock(self): return self._conn.sock class GlibXMLRPCTransport(xmlrpclib.Transport): """Integrate the request with the glib mainloop rather than blocking.""" ## # Connect to server. # # @param host Target host. # @return A connection handle. def __init__(self): pass def make_connection(self, host): """Use our own connection object so we can get its socket.""" # create a HTTP connection object from a host descriptor host, extra_headers, x509 = self.get_host_info(host) return GlibHTTP(host) ## # Send a complete request, and parse the response. # # @param host Target host. # @param handler Target PRC handler. # @param request_body XML-RPC request body. # @param verbose Debugging flag. # @return Parsed response. def start_request(self, host, handler, request_body, verbose=0, request_cb=None, user_data=None): """Do the first half of the request by sending data to the remote server. The bottom half bits get run when the remote server's response actually comes back.""" # issue XML-RPC request h = self.make_connection(host) if verbose: h.set_debuglevel(1) self.send_request(h, handler, request_body) self.send_host(h, host) self.send_user_agent(h) self.send_content(h, request_body) # Schedule a GIOWatch so we don't block waiting for the response gobject.io_add_watch(h.get_sock(), gobject.IO_IN, self._finish_request, h, host, handler, verbose, request_cb, user_data) def _finish_request(self, source, condition, h, host, handler, verbose, request_cb, user_data): """Parse and return response when the remote server actually returns it.""" if not (condition & gobject.IO_IN): return True try: errcode, errmsg, headers = h.getreply() except socket.error, err: if err[0] != 104: raise socket.error(err) else: gobject.idle_add(request_cb, RESULT_FAILED, None, user_data) return False if errcode != 200: raise xmlrpclib.ProtocolError(host + handler, errcode, errmsg, headers) self.verbose = verbose response = self._parse_response(h.getfile(), h.get_sock()) if request_cb: if len(response) == 1: response = response[0] gobject.idle_add(request_cb, RESULT_SUCCESS, response, user_data) return False class _Method: """Right, so python people thought it would be funny to make this class private to xmlrpclib.py...""" # some magic to bind an XML-RPC method to an RPC server. # supports "nested" methods (e.g. examples.getStateName) def __init__(self, send, name): self.__send = send self.__name = name def __getattr__(self, name): return _Method(self.__send, "%s.%s" % (self.__name, name)) def __call__(self, request_cb, user_data, *args): return self.__send(self.__name, request_cb, user_data, args) class GlibServerProxy(xmlrpclib.ServerProxy): """Subclass xmlrpclib.ServerProxy so we can run the XML-RPC request in two parts, integrated with the glib mainloop, such that we don't block anywhere. Using this object is somewhat special; it requires more arguments to each XML-RPC request call than the normal xmlrpclib.ServerProxy object: client = GlibServerProxy("http://127.0.0.1:8888") user_data = "bar" xmlrpc_arg1 = "test" xmlrpc_arg2 = "foo" client.test(xmlrpc_test_cb, user_data, xmlrpc_arg1, xmlrpc_arg2) Here, 'xmlrpc_test_cb' is the callback function, which has the following signature: def xmlrpc_test_cb(result_status, response, user_data=None): ... """ def __init__(self, uri, encoding=None, verbose=0, allow_none=0): self._transport = GlibXMLRPCTransport() self._encoding = encoding self._verbose = verbose self._allow_none = allow_none xmlrpclib.ServerProxy.__init__(self, uri, self._transport, encoding, verbose, allow_none) # get the url import urllib urltype, uri = urllib.splittype(uri) if urltype not in ("http", "https"): raise IOError, "unsupported XML-RPC protocol" self._host, self._handler = urllib.splithost(uri) if not self._handler: self._handler = "/RPC2" def __request(self, methodname, request_cb, user_data, params): """Call the method on the remote server. We just start the request here and the transport itself takes care of scheduling the response callback when the remote server returns the response. We don't want to block anywhere.""" request = xmlrpclib.dumps(params, methodname, encoding=self._encoding, allow_none=self._allow_none) try: response = self._transport.start_request( self._host, self._handler, request, verbose=self._verbose, request_cb=request_cb, user_data=user_data ) except socket.error, exc: gobject.idle_add(request_cb, RESULT_FAILED, None, user_data) def __getattr__(self, name): # magic method dispatcher return _Method(self.__request, name) class GroupServer(object): _MAX_MSG_SIZE = 500 def __init__(self, address, port, data_cb): self._address = address self._port = port self._data_cb = data_cb self._setup_listener() def _setup_listener(self): # Listener socket self._listen_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Set some options to make it multicast-friendly self._listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, 20) self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, 1) def start(self): # Set some more multicast options self._listen_sock.bind(('', self._port)) self._listen_sock.settimeout(2) intf = socket.gethostbyname(socket.gethostname()) self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_IF, socket.inet_aton(intf) + socket.inet_aton('0.0.0.0')) self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton(self._address) + socket.inet_aton('0.0.0.0')) # Watch the listener socket for data gobject.io_add_watch(self._listen_sock, gobject.IO_IN, self._handle_incoming_data) def _handle_incoming_data(self, source, condition): if not (condition & gobject.IO_IN): return True msg = {} msg['data'], (msg['addr'], msg['port']) = source.recvfrom(self._MAX_MSG_SIZE) if self._data_cb: self._data_cb(msg) return True class GroupClient(object): _MAX_MSG_SIZE = 500 def __init__(self, address, port): self._address = address self._port = port self._send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Make the socket multicast-aware, and set TTL. self._send_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 20) # Change TTL (=20) to suit def send_msg(self, data): self._send_sock.sendto(data, (self._address, self._port)) class Test(object): def test(self, arg1): print "Request got %s" % arg1 return "success" def xmlrpc_test_cb(response, user_data=None): print "Response was %s, user_data was %s" % (response, user_data) import gtk gtk.main_quit() def xmlrpc_test(): client = GlibServerProxy("http://127.0.0.1:8888") client.test(xmlrpc_test_cb, "bar", "test data") def main(): import gtk server = GlibXMLRPCServer(("", 8888)) inst = Test() server.register_instance(inst) gobject.idle_add(xmlrpc_test) try: gtk.main() except KeyboardInterrupt: print 'Ctrl+C pressed, exiting...' print "Done." if __name__ == "__main__": main()