mirror of https://github.com/python/cpython
601 lines
20 KiB
Python
601 lines
20 KiB
Python
"""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
|
|
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
|
|
|
|
|
|
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.currentThread().getName(), 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.currentThread()
|
|
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()
|
|
|
|
def debug(self, *args):
|
|
if not self.debugging:
|
|
return
|
|
s = self.location + " " + str(threading.currentThread().getName())
|
|
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 socket.error:
|
|
raise
|
|
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.currentThread() != 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.currentThread() != 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)
|
|
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.currentThread() 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 IOError("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.setsockopt(socket.SOL_SOCKET,
|
|
socket.SO_REUSEADDR, 1)
|
|
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 hasattr(attr, '__call__'):
|
|
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 hasattr(attr, '__call__'):
|
|
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.
|