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Edit File : rpc.py \| Size : 20.46 KB
"""RPC Implemention, originally written for the Python Idle IDE For security reasons, GvR requested that Idle's Python execution server process connect to the Idle process, which listens for the connection. Since Idle has only one client per server, this was not a limitation. +---------------------------------+ +-------------+ \| socketserver.BaseRequestHandler \| \| SocketIO \| +---------------------------------+ +-------------+ ^ \| register() \| \| \| unregister()\| \| +-------------+ \| ^ ^ \| \| \| \| + -------------------+ \| \| \| \| +-------------------------+ +-----------------+ \| RPCHandler \| \| RPCClient \| \| [attribute of RPCServer]\| \| \| +-------------------------+ +-----------------+ The RPCServer handler class is expected to provide register/unregister methods. RPCHandler inherits the mix-in class SocketIO, which provides these methods. See the Idle run.main() docstring for further information on how this was accomplished in Idle. """ import sys import os import socket import select import socketserver import struct import pickle import threading import queue import traceback import copyreg import types import marshal import builtins def unpickle_code(ms): co = marshal.loads(ms) assert isinstance(co, types.CodeType) return co def pickle_code(co): assert isinstance(co, types.CodeType) ms = marshal.dumps(co) return unpickle_code, (ms,) # XXX KBK 24Aug02 function pickling capability not used in Idle # def unpickle_function(ms): # return ms # def pickle_function(fn): # assert isinstance(fn, type.FunctionType) # return repr(fn) copyreg.pickle(types.CodeType, pickle_code, unpickle_code) # copyreg.pickle(types.FunctionType, pickle_function, unpickle_function) BUFSIZE = 81024 LOCALHOST = '127.0.0.1' class RPCServer(socketserver.TCPServer): def __init__(self, addr, handlerclass=None): if handlerclass is None: handlerclass = RPCHandler socketserver.TCPServer.__init__(self, addr, handlerclass) def server_bind(self): "Override TCPServer method, no bind() phase for connecting entity" pass def server_activate(self): """Override TCPServer method, connect() instead of listen() Due to the reversed connection, self.server_address is actually the address of the Idle Client to which we are connecting. """ self.socket.connect(self.server_address) def get_request(self): "Override TCPServer method, return already connected socket" return self.socket, self.server_address def handle_error(self, request, client_address): """Override TCPServer method Error message goes to __stderr__. No error message if exiting normally or socket raised EOF. Other exceptions not handled in server code will cause os._exit. """ try: raise except SystemExit: raise except: erf = sys.__stderr__ print('\n' + '-'40, file=erf) print('Unhandled server exception!', file=erf) print('Thread: %s' % threading.current_thread().name, file=erf) print('Client Address: ', client_address, file=erf) print('Request: ', repr(request), file=erf) traceback.print_exc(file=erf) print('\n*** Unrecoverable, server exiting!', file=erf) print('-'40, file=erf) os._exit(0) #----------------- end class RPCServer -------------------- objecttable = {} request_queue = queue.Queue(0) response_queue = queue.Queue(0) class SocketIO(object): nextseq = 0 def __init__(self, sock, objtable=None, debugging=None): self.sockthread = threading.current_thread() if debugging is not None: self.debugging = debugging self.sock = sock if objtable is None: objtable = objecttable self.objtable = objtable self.responses = {} self.cvars = {} def close(self): sock = self.sock self.sock = None if sock is not None: sock.close() def exithook(self): "override for specific exit action" os._exit(0) def debug(self, args): if not self.debugging: return s = self.location + " " + str(threading.current_thread().name) for a in args: s = s + " " + str(a) print(s, file=sys.__stderr__) def register(self, oid, object): self.objtable[oid] = object def unregister(self, oid): try: del self.objtable[oid] except KeyError: pass def localcall(self, seq, request): self.debug("localcall:", request) try: how, (oid, methodname, args, kwargs) = request except TypeError: return ("ERROR", "Bad request format") if oid not in self.objtable: return ("ERROR", "Unknown object id: %r" % (oid,)) obj = self.objtable[oid] if methodname == "__methods__": methods = {} _getmethods(obj, methods) return ("OK", methods) if methodname == "__attributes__": attributes = {} _getattributes(obj, attributes) return ("OK", attributes) if not hasattr(obj, methodname): return ("ERROR", "Unsupported method name: %r" % (methodname,)) method = getattr(obj, methodname) try: if how == 'CALL': ret = method(args, kwargs) if isinstance(ret, RemoteObject): ret = remoteref(ret) return ("OK", ret) elif how == 'QUEUE': request_queue.put((seq, (method, args, kwargs))) return("QUEUED", None) else: return ("ERROR", "Unsupported message type: %s" % how) except SystemExit: raise except KeyboardInterrupt: raise except socket.error: raise except Exception as ex: return ("CALLEXC", ex) except: msg = " Internal Error: rpc.py:SocketIO.localcall()\n\n"\ " Object: %s \n Method: %s \n Args: %s\n" print(msg % (oid, method, args), file=sys.__stderr__) traceback.print_exc(file=sys.__stderr__) return ("EXCEPTION", None) def remotecall(self, oid, methodname, args, kwargs): self.debug("remotecall:asynccall: ", oid, methodname) seq = self.asynccall(oid, methodname, args, kwargs) return self.asyncreturn(seq) def remotequeue(self, oid, methodname, args, kwargs): self.debug("remotequeue:asyncqueue: ", oid, methodname) seq = self.asyncqueue(oid, methodname, args, kwargs) return self.asyncreturn(seq) def asynccall(self, oid, methodname, args, kwargs): request = ("CALL", (oid, methodname, args, kwargs)) seq = self.newseq() if threading.current_thread() != self.sockthread: cvar = threading.Condition() self.cvars[seq] = cvar self.debug(("asynccall:%d:" % seq), oid, methodname, args, kwargs) self.putmessage((seq, request)) return seq def asyncqueue(self, oid, methodname, args, kwargs): request = ("QUEUE", (oid, methodname, args, kwargs)) seq = self.newseq() if threading.current_thread() != self.sockthread: cvar = threading.Condition() self.cvars[seq] = cvar self.debug(("asyncqueue:%d:" % seq), oid, methodname, args, kwargs) self.putmessage((seq, request)) return seq def asyncreturn(self, seq): self.debug("asyncreturn:%d:call getresponse(): " % seq) response = self.getresponse(seq, wait=0.05) self.debug(("asyncreturn:%d:response: " % seq), response) return self.decoderesponse(response) def decoderesponse(self, response): how, what = response if how == "OK": return what if how == "QUEUED": return None if how == "EXCEPTION": self.debug("decoderesponse: EXCEPTION") return None if how == "EOF": self.debug("decoderesponse: EOF") self.decode_interrupthook() return None if how == "ERROR": self.debug("decoderesponse: Internal ERROR:", what) raise RuntimeError(what) if how == "CALLEXC": self.debug("decoderesponse: Call Exception:", what) raise what raise SystemError(how, what) def decode_interrupthook(self): "" raise EOFError def mainloop(self): """Listen on socket until I/O not ready or EOF pollresponse() will loop looking for seq number None, which never comes, and exit on EOFError. """ try: self.getresponse(myseq=None, wait=0.05) except EOFError: self.debug("mainloop:return") return def getresponse(self, myseq, wait): response = self._getresponse(myseq, wait) if response is not None: how, what = response if how == "OK": response = how, self._proxify(what) return response def _proxify(self, obj): if isinstance(obj, RemoteProxy): return RPCProxy(self, obj.oid) if isinstance(obj, list): return list(map(self._proxify, obj)) # XXX Check for other types -- not currently needed return obj def _getresponse(self, myseq, wait): self.debug("_getresponse:myseq:", myseq) if threading.current_thread() is self.sockthread: # this thread does all reading of requests or responses while 1: response = self.pollresponse(myseq, wait) if response is not None: return response else: # wait for notification from socket handling thread cvar = self.cvars[myseq] cvar.acquire() while myseq not in self.responses: cvar.wait() response = self.responses[myseq] self.debug("_getresponse:%s: thread woke up: response: %s" % (myseq, response)) del self.responses[myseq] del self.cvars[myseq] cvar.release() return response def newseq(self): self.nextseq = seq = self.nextseq + 2 return seq def putmessage(self, message): self.debug("putmessage:%d:" % message[0]) try: s = pickle.dumps(message) except pickle.PicklingError: print("Cannot pickle:", repr(message), file=sys.__stderr__) raise s = struct.pack("<i", len(s)) + s while len(s) > 0: try: r, w, x = select.select([], [self.sock], []) n = self.sock.send(s[:BUFSIZE]) except (AttributeError, TypeError): raise OSError("socket no longer exists") except socket.error: raise else: s = s[n:] buff = b'' bufneed = 4 bufstate = 0 # meaning: 0 => reading count; 1 => reading data def pollpacket(self, wait): self._stage0() if len(self.buff) < self.bufneed: r, w, x = select.select([self.sock.fileno()], [], [], wait) if len(r) == 0: return None try: s = self.sock.recv(BUFSIZE) except socket.error: raise EOFError if len(s) == 0: raise EOFError self.buff += s self._stage0() return self._stage1() def _stage0(self): if self.bufstate == 0 and len(self.buff) >= 4: s = self.buff[:4] self.buff = self.buff[4:] self.bufneed = struct.unpack("<i", s)[0] self.bufstate = 1 def _stage1(self): if self.bufstate == 1 and len(self.buff) >= self.bufneed: packet = self.buff[:self.bufneed] self.buff = self.buff[self.bufneed:] self.bufneed = 4 self.bufstate = 0 return packet def pollmessage(self, wait): packet = self.pollpacket(wait) if packet is None: return None try: message = pickle.loads(packet) except pickle.UnpicklingError: print("-----------------------", file=sys.__stderr__) print("cannot unpickle packet:", repr(packet), file=sys.__stderr__) traceback.print_stack(file=sys.__stderr__) print("-----------------------", file=sys.__stderr__) raise return message def pollresponse(self, myseq, wait): """Handle messages received on the socket. Some messages received may be asynchronous 'call' or 'queue' requests, and some may be responses for other threads. 'call' requests are passed to self.localcall() with the expectation of immediate execution, during which time the socket is not serviced. 'queue' requests are used for tasks (which may block or hang) to be processed in a different thread. These requests are fed into request_queue by self.localcall(). Responses to queued requests are taken from response_queue and sent across the link with the associated sequence numbers. Messages in the queues are (sequence_number, request/response) tuples and code using this module removing messages from the request_queue is responsible for returning the correct sequence number in the response_queue. pollresponse() will loop until a response message with the myseq sequence number is received, and will save other responses in self.responses and notify the owning thread. """ while 1: # send queued response if there is one available try: qmsg = response_queue.get(0) except queue.Empty: pass else: seq, response = qmsg message = (seq, ('OK', response)) self.putmessage(message) # poll for message on link try: message = self.pollmessage(wait) if message is None: # socket not ready return None except EOFError: self.handle_EOF() return None except AttributeError: return None seq, resq = message how = resq[0] self.debug("pollresponse:%d:myseq:%s" % (seq, myseq)) # process or queue a request if how in ("CALL", "QUEUE"): self.debug("pollresponse:%d:localcall:call:" % seq) response = self.localcall(seq, resq) self.debug("pollresponse:%d:localcall:response:%s" % (seq, response)) if how == "CALL": self.putmessage((seq, response)) elif how == "QUEUE": # don't acknowledge the 'queue' request! pass continue # return if completed message transaction elif seq == myseq: return resq # must be a response for a different thread: else: cv = self.cvars.get(seq, None) # response involving unknown sequence number is discarded, # probably intended for prior incarnation of server if cv is not None: cv.acquire() self.responses[seq] = resq cv.notify() cv.release() continue def handle_EOF(self): "action taken upon link being closed by peer" self.EOFhook() self.debug("handle_EOF") for key in self.cvars: cv = self.cvars[key] cv.acquire() self.responses[key] = ('EOF', None) cv.notify() cv.release() # call our (possibly overridden) exit function self.exithook() def EOFhook(self): "Classes using rpc client/server can override to augment EOF action" pass #----------------- end class SocketIO -------------------- class RemoteObject(object): # Token mix-in class pass def remoteref(obj): oid = id(obj) objecttable[oid] = obj return RemoteProxy(oid) class RemoteProxy(object): def __init__(self, oid): self.oid = oid class RPCHandler(socketserver.BaseRequestHandler, SocketIO): debugging = False location = "#S" # Server def __init__(self, sock, addr, svr): svr.current_handler = self ## cgt xxx SocketIO.__init__(self, sock) socketserver.BaseRequestHandler.__init__(self, sock, addr, svr) def handle(self): "handle() method required by socketserver" self.mainloop() def get_remote_proxy(self, oid): return RPCProxy(self, oid) class RPCClient(SocketIO): debugging = False location = "#C" # Client nextseq = 1 # Requests coming from the client are odd numbered def __init__(self, address, family=socket.AF_INET, type=socket.SOCK_STREAM): self.listening_sock = socket.socket(family, type) self.listening_sock.bind(address) self.listening_sock.listen(1) def accept(self): working_sock, address = self.listening_sock.accept() if self.debugging: print("** Connection request from ", address, file=sys.__stderr__) if address[0] == LOCALHOST: SocketIO.__init__(self, working_sock) else: print(" Invalid host: ", address, file=sys.__stderr__) raise socket.error def get_remote_proxy(self, oid): return RPCProxy(self, oid) class RPCProxy(object): __methods = None __attributes = None def __init__(self, sockio, oid): self.sockio = sockio self.oid = oid def __getattr__(self, name): if self.__methods is None: self.__getmethods() if self.__methods.get(name): return MethodProxy(self.sockio, self.oid, name) if self.__attributes is None: self.__getattributes() if name in self.__attributes: value = self.sockio.remotecall(self.oid, '__getattribute__', (name,), {}) return value else: raise AttributeError(name) def __getattributes(self): self.__attributes = self.sockio.remotecall(self.oid, "__attributes__", (), {}) def __getmethods(self): self.__methods = self.sockio.remotecall(self.oid, "__methods__", (), {}) def _getmethods(obj, methods): # Helper to get a list of methods from an object # Adds names to dictionary argument 'methods' for name in dir(obj): attr = getattr(obj, name) if callable(attr): methods[name] = 1 if isinstance(obj, type): for super in obj.__bases__: _getmethods(super, methods) def _getattributes(obj, attributes): for name in dir(obj): attr = getattr(obj, name) if not callable(attr): attributes[name] = 1 class MethodProxy(object): def __init__(self, sockio, oid, name): self.sockio = sockio self.oid = oid self.name = name def __call__(self, args, *kwargs): value = self.sockio.remotecall(self.oid, self.name, args, kwargs) return value # XXX KBK 09Sep03 We need a proper unit test for this module. Previously # existing test code was removed at Rev 1.27 (r34098). def displayhook(value): """Override standard display hook to use non-locale encoding""" if value is None: return # Set '_' to None to avoid recursion builtins._ = None text = repr(value) try: sys.stdout.write(text) except UnicodeEncodeError: # let's use ascii while utf8-bmp codec doesn't present encoding = 'ascii' bytes = text.encode(encoding, 'backslashreplace') text = bytes.decode(encoding, 'strict') sys.stdout.write(text) sys.stdout.write("\n") builtins._ = value Back

Edit File : rpc.py | Size : 20.46 KB

"""RPC Implemention, originally written for the Python Idle IDE

For security reasons, GvR requested that Idle's Python execution server process
connect to the Idle process, which listens for the connection.  Since Idle has
only one client per server, this was not a limitation.

+---------------------------------+ +-------------+
   | socketserver.BaseRequestHandler | | SocketIO    |
   +---------------------------------+ +-------------+
                   ^                   | register()  |
                   |                   | unregister()|
                   |                   +-------------+
                   |                      ^  ^
                   |                      |  |
                   | + -------------------+  |
                   | |                       |
   +-------------------------+        +-----------------+
   | RPCHandler              |        | RPCClient       |
   | [attribute of RPCServer]|        |                 |
   +-------------------------+        +-----------------+

The RPCServer handler class is expected to provide register/unregister methods.
RPCHandler inherits the mix-in class SocketIO, which provides these methods.

See the Idle run.main() docstring for further information on how this was
accomplished in Idle.

"""

import sys
import os
import socket
import select
import socketserver
import struct
import pickle
import threading
import queue
import traceback
import copyreg
import types
import marshal
import builtins

def unpickle_code(ms):
    co = marshal.loads(ms)
    assert isinstance(co, types.CodeType)
    return co

def pickle_code(co):
    assert isinstance(co, types.CodeType)
    ms = marshal.dumps(co)
    return unpickle_code, (ms,)

# XXX KBK 24Aug02 function pickling capability not used in Idle
#  def unpickle_function(ms):
#      return ms

#  def pickle_function(fn):
#      assert isinstance(fn, type.FunctionType)
#      return repr(fn)

copyreg.pickle(types.CodeType, pickle_code, unpickle_code)
# copyreg.pickle(types.FunctionType, pickle_function, unpickle_function)

BUFSIZE = 8*1024
LOCALHOST = '127.0.0.1'

class RPCServer(socketserver.TCPServer):

def __init__(self, addr, handlerclass=None):
        if handlerclass is None:
            handlerclass = RPCHandler
        socketserver.TCPServer.__init__(self, addr, handlerclass)

def server_bind(self):
        "Override TCPServer method, no bind() phase for connecting entity"
        pass

def server_activate(self):
        """Override TCPServer method, connect() instead of listen()

Due to the reversed connection, self.server_address is actually the
        address of the Idle Client to which we are connecting.

"""
        self.socket.connect(self.server_address)

def get_request(self):
        "Override TCPServer method, return already connected socket"
        return self.socket, self.server_address

def handle_error(self, request, client_address):
        """Override TCPServer method

Error message goes to __stderr__.  No error message if exiting
        normally or socket raised EOF.  Other exceptions not handled in
        server code will cause os._exit.

"""
        try:
            raise
        except SystemExit:
            raise
        except:
            erf = sys.__stderr__
            print('\n' + '-'*40, file=erf)
            print('Unhandled server exception!', file=erf)
            print('Thread: %s' % threading.current_thread().name, file=erf)
            print('Client Address: ', client_address, file=erf)
            print('Request: ', repr(request), file=erf)
            traceback.print_exc(file=erf)
            print('\n*** Unrecoverable, server exiting!', file=erf)
            print('-'*40, file=erf)
            os._exit(0)

#----------------- end class RPCServer --------------------

objecttable = {}
request_queue = queue.Queue(0)
response_queue = queue.Queue(0)

class SocketIO(object):

nextseq = 0

def __init__(self, sock, objtable=None, debugging=None):
        self.sockthread = threading.current_thread()
        if debugging is not None:
            self.debugging = debugging
        self.sock = sock
        if objtable is None:
            objtable = objecttable
        self.objtable = objtable
        self.responses = {}
        self.cvars = {}

def close(self):
        sock = self.sock
        self.sock = None
        if sock is not None:
            sock.close()

def exithook(self):
        "override for specific exit action"
        os._exit(0)

def debug(self, *args):
        if not self.debugging:
            return
        s = self.location + " " + str(threading.current_thread().name)
        for a in args:
            s = s + " " + str(a)
        print(s, file=sys.__stderr__)

def register(self, oid, object):
        self.objtable[oid] = object

def unregister(self, oid):
        try:
            del self.objtable[oid]
        except KeyError:
            pass

def localcall(self, seq, request):
        self.debug("localcall:", request)
        try:
            how, (oid, methodname, args, kwargs) = request
        except TypeError:
            return ("ERROR", "Bad request format")
        if oid not in self.objtable:
            return ("ERROR", "Unknown object id: %r" % (oid,))
        obj = self.objtable[oid]
        if methodname == "__methods__":
            methods = {}
            _getmethods(obj, methods)
            return ("OK", methods)
        if methodname == "__attributes__":
            attributes = {}
            _getattributes(obj, attributes)
            return ("OK", attributes)
        if not hasattr(obj, methodname):
            return ("ERROR", "Unsupported method name: %r" % (methodname,))
        method = getattr(obj, methodname)
        try:
            if how == 'CALL':
                ret = method(*args, **kwargs)
                if isinstance(ret, RemoteObject):
                    ret = remoteref(ret)
                return ("OK", ret)
            elif how == 'QUEUE':
                request_queue.put((seq, (method, args, kwargs)))
                return("QUEUED", None)
            else:
                return ("ERROR", "Unsupported message type: %s" % how)
        except SystemExit:
            raise
        except KeyboardInterrupt:
            raise
        except socket.error:
            raise
        except Exception as ex:
            return ("CALLEXC", ex)
        except:
            msg = "*** Internal Error: rpc.py:SocketIO.localcall()\n\n"\
                  " Object: %s \n Method: %s \n Args: %s\n"
            print(msg % (oid, method, args), file=sys.__stderr__)
            traceback.print_exc(file=sys.__stderr__)
            return ("EXCEPTION", None)

def remotecall(self, oid, methodname, args, kwargs):
        self.debug("remotecall:asynccall: ", oid, methodname)
        seq = self.asynccall(oid, methodname, args, kwargs)
        return self.asyncreturn(seq)

def remotequeue(self, oid, methodname, args, kwargs):
        self.debug("remotequeue:asyncqueue: ", oid, methodname)
        seq = self.asyncqueue(oid, methodname, args, kwargs)
        return self.asyncreturn(seq)

def asynccall(self, oid, methodname, args, kwargs):
        request = ("CALL", (oid, methodname, args, kwargs))
        seq = self.newseq()
        if threading.current_thread() != self.sockthread:
            cvar = threading.Condition()
            self.cvars[seq] = cvar
        self.debug(("asynccall:%d:" % seq), oid, methodname, args, kwargs)
        self.putmessage((seq, request))
        return seq

def asyncqueue(self, oid, methodname, args, kwargs):
        request = ("QUEUE", (oid, methodname, args, kwargs))
        seq = self.newseq()
        if threading.current_thread() != self.sockthread:
            cvar = threading.Condition()
            self.cvars[seq] = cvar
        self.debug(("asyncqueue:%d:" % seq), oid, methodname, args, kwargs)
        self.putmessage((seq, request))
        return seq

def asyncreturn(self, seq):
        self.debug("asyncreturn:%d:call getresponse(): " % seq)
        response = self.getresponse(seq, wait=0.05)
        self.debug(("asyncreturn:%d:response: " % seq), response)
        return self.decoderesponse(response)

def decoderesponse(self, response):
        how, what = response
        if how == "OK":
            return what
        if how == "QUEUED":
            return None
        if how == "EXCEPTION":
            self.debug("decoderesponse: EXCEPTION")
            return None
        if how == "EOF":
            self.debug("decoderesponse: EOF")
            self.decode_interrupthook()
            return None
        if how == "ERROR":
            self.debug("decoderesponse: Internal ERROR:", what)
            raise RuntimeError(what)
        if how == "CALLEXC":
            self.debug("decoderesponse: Call Exception:", what)
            raise what
        raise SystemError(how, what)

def decode_interrupthook(self):
        ""
        raise EOFError

def mainloop(self):
        """Listen on socket until I/O not ready or EOF

pollresponse() will loop looking for seq number None, which
        never comes, and exit on EOFError.

"""
        try:
            self.getresponse(myseq=None, wait=0.05)
        except EOFError:
            self.debug("mainloop:return")
            return

def getresponse(self, myseq, wait):
        response = self._getresponse(myseq, wait)
        if response is not None:
            how, what = response
            if how == "OK":
                response = how, self._proxify(what)
        return response

def _proxify(self, obj):
        if isinstance(obj, RemoteProxy):
            return RPCProxy(self, obj.oid)
        if isinstance(obj, list):
            return list(map(self._proxify, obj))
        # XXX Check for other types -- not currently needed
        return obj

def _getresponse(self, myseq, wait):
        self.debug("_getresponse:myseq:", myseq)
        if threading.current_thread() is self.sockthread:
            # this thread does all reading of requests or responses
            while 1:
                response = self.pollresponse(myseq, wait)
                if response is not None:
                    return response
        else:
            # wait for notification from socket handling thread
            cvar = self.cvars[myseq]
            cvar.acquire()
            while myseq not in self.responses:
                cvar.wait()
            response = self.responses[myseq]
            self.debug("_getresponse:%s: thread woke up: response: %s" %
                       (myseq, response))
            del self.responses[myseq]
            del self.cvars[myseq]
            cvar.release()
            return response

def newseq(self):
        self.nextseq = seq = self.nextseq + 2
        return seq

def putmessage(self, message):
        self.debug("putmessage:%d:" % message[0])
        try:
            s = pickle.dumps(message)
        except pickle.PicklingError:
            print("Cannot pickle:", repr(message), file=sys.__stderr__)
            raise
        s = struct.pack("<i", len(s)) + s
        while len(s) > 0:
            try:
                r, w, x = select.select([], [self.sock], [])
                n = self.sock.send(s[:BUFSIZE])
            except (AttributeError, TypeError):
                raise OSError("socket no longer exists")
            except socket.error:
                raise
            else:
                s = s[n:]

buff = b''
    bufneed = 4
    bufstate = 0 # meaning: 0 => reading count; 1 => reading data

def pollpacket(self, wait):
        self._stage0()
        if len(self.buff) < self.bufneed:
            r, w, x = select.select([self.sock.fileno()], [], [], wait)
            if len(r) == 0:
                return None
            try:
                s = self.sock.recv(BUFSIZE)
            except socket.error:
                raise EOFError
            if len(s) == 0:
                raise EOFError
            self.buff += s
            self._stage0()
        return self._stage1()

def _stage0(self):
        if self.bufstate == 0 and len(self.buff) >= 4:
            s = self.buff[:4]
            self.buff = self.buff[4:]
            self.bufneed = struct.unpack("<i", s)[0]
            self.bufstate = 1

def _stage1(self):
        if self.bufstate == 1 and len(self.buff) >= self.bufneed:
            packet = self.buff[:self.bufneed]
            self.buff = self.buff[self.bufneed:]
            self.bufneed = 4
            self.bufstate = 0
            return packet

def pollmessage(self, wait):
        packet = self.pollpacket(wait)
        if packet is None:
            return None
        try:
            message = pickle.loads(packet)
        except pickle.UnpicklingError:
            print("-----------------------", file=sys.__stderr__)
            print("cannot unpickle packet:", repr(packet), file=sys.__stderr__)
            traceback.print_stack(file=sys.__stderr__)
            print("-----------------------", file=sys.__stderr__)
            raise
        return message

def pollresponse(self, myseq, wait):
        """Handle messages received on the socket.

Some messages received may be asynchronous 'call' or 'queue' requests,
        and some may be responses for other threads.

'call' requests are passed to self.localcall() with the expectation of
        immediate execution, during which time the socket is not serviced.

'queue' requests are used for tasks (which may block or hang) to be
        processed in a different thread.  These requests are fed into
        request_queue by self.localcall().  Responses to queued requests are
        taken from response_queue and sent across the link with the associated
        sequence numbers.  Messages in the queues are (sequence_number,
        request/response) tuples and code using this module removing messages
        from the request_queue is responsible for returning the correct
        sequence number in the response_queue.

pollresponse() will loop until a response message with the myseq
        sequence number is received, and will save other responses in
        self.responses and notify the owning thread.

"""
        while 1:
            # send queued response if there is one available
            try:
                qmsg = response_queue.get(0)
            except queue.Empty:
                pass
            else:
                seq, response = qmsg
                message = (seq, ('OK', response))
                self.putmessage(message)
            # poll for message on link
            try:
                message = self.pollmessage(wait)
                if message is None:  # socket not ready
                    return None
            except EOFError:
                self.handle_EOF()
                return None
            except AttributeError:
                return None
            seq, resq = message
            how = resq[0]
            self.debug("pollresponse:%d:myseq:%s" % (seq, myseq))
            # process or queue a request
            if how in ("CALL", "QUEUE"):
                self.debug("pollresponse:%d:localcall:call:" % seq)
                response = self.localcall(seq, resq)
                self.debug("pollresponse:%d:localcall:response:%s"
                           % (seq, response))
                if how == "CALL":
                    self.putmessage((seq, response))
                elif how == "QUEUE":
                    # don't acknowledge the 'queue' request!
                    pass
                continue
            # return if completed message transaction
            elif seq == myseq:
                return resq
            # must be a response for a different thread:
            else:
                cv = self.cvars.get(seq, None)
                # response involving unknown sequence number is discarded,
                # probably intended for prior incarnation of server
                if cv is not None:
                    cv.acquire()
                    self.responses[seq] = resq
                    cv.notify()
                    cv.release()
                continue

def handle_EOF(self):
        "action taken upon link being closed by peer"
        self.EOFhook()
        self.debug("handle_EOF")
        for key in self.cvars:
            cv = self.cvars[key]
            cv.acquire()
            self.responses[key] = ('EOF', None)
            cv.notify()
            cv.release()
        # call our (possibly overridden) exit function
        self.exithook()

def EOFhook(self):
        "Classes using rpc client/server can override to augment EOF action"
        pass

#----------------- end class SocketIO --------------------

class RemoteObject(object):
    # Token mix-in class
    pass

def remoteref(obj):
    oid = id(obj)
    objecttable[oid] = obj
    return RemoteProxy(oid)

class RemoteProxy(object):

def __init__(self, oid):
        self.oid = oid

class RPCHandler(socketserver.BaseRequestHandler, SocketIO):

debugging = False
    location = "#S"  # Server

def __init__(self, sock, addr, svr):
        svr.current_handler = self ## cgt xxx
        SocketIO.__init__(self, sock)
        socketserver.BaseRequestHandler.__init__(self, sock, addr, svr)

def handle(self):
        "handle() method required by socketserver"
        self.mainloop()

def get_remote_proxy(self, oid):
        return RPCProxy(self, oid)

class RPCClient(SocketIO):

debugging = False
    location = "#C"  # Client

nextseq = 1 # Requests coming from the client are odd numbered

def __init__(self, address, family=socket.AF_INET, type=socket.SOCK_STREAM):
        self.listening_sock = socket.socket(family, type)
        self.listening_sock.bind(address)
        self.listening_sock.listen(1)

def accept(self):
        working_sock, address = self.listening_sock.accept()
        if self.debugging:
            print("****** Connection request from ", address, file=sys.__stderr__)
        if address[0] == LOCALHOST:
            SocketIO.__init__(self, working_sock)
        else:
            print("** Invalid host: ", address, file=sys.__stderr__)
            raise socket.error

def get_remote_proxy(self, oid):
        return RPCProxy(self, oid)

class RPCProxy(object):

__methods = None
    __attributes = None

def __init__(self, sockio, oid):
        self.sockio = sockio
        self.oid = oid

def __getattr__(self, name):
        if self.__methods is None:
            self.__getmethods()
        if self.__methods.get(name):
            return MethodProxy(self.sockio, self.oid, name)
        if self.__attributes is None:
            self.__getattributes()
        if name in self.__attributes:
            value = self.sockio.remotecall(self.oid, '__getattribute__',
                                           (name,), {})
            return value
        else:
            raise AttributeError(name)

def __getattributes(self):
        self.__attributes = self.sockio.remotecall(self.oid,
                                                "__attributes__", (), {})

def __getmethods(self):
        self.__methods = self.sockio.remotecall(self.oid,
                                                "__methods__", (), {})

def _getmethods(obj, methods):
    # Helper to get a list of methods from an object
    # Adds names to dictionary argument 'methods'
    for name in dir(obj):
        attr = getattr(obj, name)
        if callable(attr):
            methods[name] = 1
    if isinstance(obj, type):
        for super in obj.__bases__:
            _getmethods(super, methods)

def _getattributes(obj, attributes):
    for name in dir(obj):
        attr = getattr(obj, name)
        if not callable(attr):
            attributes[name] = 1

class MethodProxy(object):

def __init__(self, sockio, oid, name):
        self.sockio = sockio
        self.oid = oid
        self.name = name

def __call__(self, *args, **kwargs):
        value = self.sockio.remotecall(self.oid, self.name, args, kwargs)
        return value

# XXX KBK 09Sep03  We need a proper unit test for this module.  Previously
#                  existing test code was removed at Rev 1.27 (r34098).

def displayhook(value):
    """Override standard display hook to use non-locale encoding"""
    if value is None:
        return
    # Set '_' to None to avoid recursion
    builtins._ = None
    text = repr(value)
    try:
        sys.stdout.write(text)
    except UnicodeEncodeError:
        # let's use ascii while utf8-bmp codec doesn't present
        encoding = 'ascii'
        bytes = text.encode(encoding, 'backslashreplace')
        text = bytes.decode(encoding, 'strict')
        sys.stdout.write(text)
    sys.stdout.write("\n")
    builtins._ = value

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