552 lines
17 KiB
Python
552 lines
17 KiB
Python
# ASCII-art documentation
|
|
#
|
|
# +---------------------------------+ +----------+
|
|
# | SocketServer.BaseRequestHandler | | SocketIO |
|
|
# +---------------------------------+ +----------+
|
|
# ^ ^ ^
|
|
# | | |
|
|
# | + -------------------+ |
|
|
# | | |
|
|
# +-------------------------+ +-----------------+
|
|
# | RPCHandler | | RPCClient |
|
|
# |-------------------------| |-----------------|
|
|
# | register() | | remotecall() |
|
|
# | unregister() | | register() |
|
|
# | | | unregister() |
|
|
# | | | get_remote_proxy|
|
|
# +-------------------------+ +-----------------+
|
|
#
|
|
import sys
|
|
import socket
|
|
import select
|
|
import SocketServer
|
|
import struct
|
|
import cPickle as pickle
|
|
import threading
|
|
import traceback
|
|
import copy_reg
|
|
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,)
|
|
|
|
def unpickle_function(ms):
|
|
return ms
|
|
|
|
def pickle_function(fn):
|
|
assert isinstance(fn, type.FunctionType)
|
|
return `fn`
|
|
|
|
copy_reg.pickle(types.CodeType, pickle_code, unpickle_code)
|
|
copy_reg.pickle(types.FunctionType, pickle_function, unpickle_function)
|
|
|
|
BUFSIZE = 8*1024
|
|
|
|
class RPCServer(SocketServer.TCPServer):
|
|
|
|
def __init__(self, addr, handlerclass=None):
|
|
if handlerclass is None:
|
|
handlerclass = RPCHandler
|
|
# XXX KBK 25Jun02 Not used in Idlefork, see register/unregister note below.
|
|
# self.objtable = objecttable
|
|
SocketServer.TCPServer.__init__(self, addr, handlerclass)
|
|
|
|
# XXX KBK 25Jun02 Following method is not used (yet)
|
|
# def verify_request(self, request, client_address):
|
|
# host, port = client_address
|
|
# if host != "127.0.0.1":
|
|
# print "Disallowed host:", host
|
|
# return 0
|
|
# else:
|
|
# return 1
|
|
|
|
# XXX KBK 25Jun02 The handlerclass is expected to provide register/unregister
|
|
# methods. In Idle, RPCServer is instantiated with
|
|
# handlerclass MyHandler, which in turn inherits the
|
|
# register/unregister methods from the mix-in class SocketIO.
|
|
# It is true that this is asymmetric with the RPCClient's use
|
|
# of register/unregister, but I guess that's how a SocketServer
|
|
# is supposed to work.
|
|
|
|
# Exactly how this gets set up is convoluted. When the
|
|
# TCPServer is instantiated, it creates an instance of
|
|
# run.MyHandler and calls its handle() method. handle()
|
|
# instantiates a run.Executive, passing it a reference to the
|
|
# MyHandler object. That reference is saved as an attribute of
|
|
# the Executive instance. The Executive methods have access to
|
|
# the reference and can pass it on to entities that they
|
|
# command (e.g. RemoteDebugger.Debugger.start_debugger()). The
|
|
# latter, in turn, can call MyHandler(SocketIO)
|
|
# register/unregister methods via the reference to register and
|
|
# unregister themselves. Whew.
|
|
|
|
# The following two methods are not currently used in Idlefork.
|
|
# def register(self, oid, object):
|
|
# self.objtable[oid] = object
|
|
|
|
# def unregister(self, oid):
|
|
# try:
|
|
# del self.objtable[oid]
|
|
# except KeyError:
|
|
# pass
|
|
|
|
|
|
objecttable = {}
|
|
|
|
class SocketIO:
|
|
|
|
debugging = 0
|
|
|
|
def __init__(self, sock, objtable=None, debugging=None):
|
|
self.mainthread = threading.currentThread()
|
|
if debugging is not None:
|
|
self.debugging = debugging
|
|
self.sock = sock
|
|
if objtable is None:
|
|
objtable = objecttable
|
|
self.objtable = objtable
|
|
self.statelock = threading.Lock()
|
|
self.responses = {}
|
|
self.cvars = {}
|
|
|
|
def close(self):
|
|
sock = self.sock
|
|
self.sock = None
|
|
if sock is not None:
|
|
sock.close()
|
|
|
|
def debug(self, *args):
|
|
if not self.debugging:
|
|
return
|
|
s = str(threading.currentThread().getName())
|
|
for a in args:
|
|
s = s + " " + str(a)
|
|
s = s + "\n"
|
|
sys.__stderr__.write(s)
|
|
|
|
def register(self, oid, object):
|
|
self.objtable[oid] = object
|
|
|
|
def unregister(self, oid):
|
|
try:
|
|
del self.objtable[oid]
|
|
except KeyError:
|
|
pass
|
|
|
|
def localcall(self, request):
|
|
self.debug("localcall:", request)
|
|
try:
|
|
how, (oid, methodname, args, kwargs) = request
|
|
except TypeError:
|
|
return ("ERROR", "Bad request format")
|
|
assert how == "call"
|
|
if not self.objtable.has_key(oid):
|
|
return ("ERROR", "Unknown object id: %s" % `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: %s" % `methodname`)
|
|
method = getattr(obj, methodname)
|
|
try:
|
|
ret = method(*args, **kwargs)
|
|
if isinstance(ret, RemoteObject):
|
|
ret = remoteref(ret)
|
|
return ("OK", ret)
|
|
except:
|
|
##traceback.print_exc(file=sys.__stderr__)
|
|
typ, val, tb = info = sys.exc_info()
|
|
sys.last_type, sys.last_value, sys.last_traceback = info
|
|
if isinstance(typ, type(Exception)):
|
|
# Class exceptions
|
|
mod = typ.__module__
|
|
name = typ.__name__
|
|
if issubclass(typ, Exception):
|
|
args = val.args
|
|
else:
|
|
args = (str(val),)
|
|
else:
|
|
# String exceptions
|
|
mod = None
|
|
name = typ
|
|
args = (str(val),)
|
|
tb = traceback.extract_tb(tb)
|
|
return ("EXCEPTION", (mod, name, args, tb))
|
|
|
|
def remotecall(self, oid, methodname, args, kwargs):
|
|
self.debug("remotecall:", oid, methodname, args, kwargs)
|
|
seq = self.asynccall(oid, methodname, args, kwargs)
|
|
return self.asyncreturn(seq)
|
|
|
|
def asynccall(self, oid, methodname, args, kwargs):
|
|
request = ("call", (oid, methodname, args, kwargs))
|
|
seq = self.putrequest(request)
|
|
return seq
|
|
|
|
def asyncreturn(self, seq):
|
|
response = self.getresponse(seq)
|
|
return self.decoderesponse(response)
|
|
|
|
def decoderesponse(self, response):
|
|
how, what = response
|
|
if how == "OK":
|
|
return what
|
|
if how == "EXCEPTION":
|
|
mod, name, args, tb = what
|
|
self.traceback = tb
|
|
if mod:
|
|
try:
|
|
__import__(mod)
|
|
module = sys.modules[mod]
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
try:
|
|
cls = getattr(module, name)
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
raise getattr(__import__(mod), name)(*args)
|
|
raise name, args
|
|
if how == "ERROR":
|
|
raise RuntimeError, what
|
|
raise SystemError, (how, what)
|
|
|
|
def mainloop(self):
|
|
try:
|
|
self.getresponse(None)
|
|
except EOFError:
|
|
pass
|
|
|
|
def getresponse(self, myseq):
|
|
response = self._getresponse(myseq)
|
|
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, types.ListType):
|
|
return map(self._proxify, obj)
|
|
# XXX Check for other types -- not currently needed
|
|
return obj
|
|
|
|
def _getresponse(self, myseq):
|
|
if threading.currentThread() is self.mainthread:
|
|
# Main thread: does all reading of requests and responses
|
|
while 1:
|
|
response = self.pollresponse(myseq, None)
|
|
if response is not None:
|
|
return response
|
|
else:
|
|
# Auxiliary thread: wait for notification from main thread
|
|
cvar = threading.Condition(self.statelock)
|
|
self.statelock.acquire()
|
|
self.cvars[myseq] = cvar
|
|
while not self.responses.has_key(myseq):
|
|
cvar.wait()
|
|
response = self.responses[myseq]
|
|
del self.responses[myseq]
|
|
del self.cvars[myseq]
|
|
self.statelock.release()
|
|
return response
|
|
|
|
def putrequest(self, request):
|
|
seq = self.newseq()
|
|
self.putmessage((seq, request))
|
|
return seq
|
|
|
|
nextseq = 0
|
|
|
|
def newseq(self):
|
|
self.nextseq = seq = self.nextseq + 2
|
|
return seq
|
|
|
|
def putmessage(self, message):
|
|
try:
|
|
s = pickle.dumps(message)
|
|
except:
|
|
print >>sys.__stderr__, "Cannot pickle:", `message`
|
|
raise
|
|
s = struct.pack("<i", len(s)) + s
|
|
while len(s) > 0:
|
|
n = self.sock.send(s)
|
|
s = s[n:]
|
|
|
|
def ioready(self, wait=0.0):
|
|
r, w, x = select.select([self.sock.fileno()], [], [], wait)
|
|
return len(r)
|
|
|
|
buffer = ""
|
|
bufneed = 4
|
|
bufstate = 0 # meaning: 0 => reading count; 1 => reading data
|
|
|
|
def pollpacket(self, wait=0.0):
|
|
self._stage0()
|
|
if len(self.buffer) < self.bufneed:
|
|
if not self.ioready(wait):
|
|
return None
|
|
try:
|
|
s = self.sock.recv(BUFSIZE)
|
|
except socket.error:
|
|
raise EOFError
|
|
if len(s) == 0:
|
|
raise EOFError
|
|
self.buffer += s
|
|
self._stage0()
|
|
return self._stage1()
|
|
|
|
def _stage0(self):
|
|
if self.bufstate == 0 and len(self.buffer) >= 4:
|
|
s = self.buffer[:4]
|
|
self.buffer = self.buffer[4:]
|
|
self.bufneed = struct.unpack("<i", s)[0]
|
|
self.bufstate = 1
|
|
|
|
def _stage1(self):
|
|
if self.bufstate == 1 and len(self.buffer) >= self.bufneed:
|
|
packet = self.buffer[:self.bufneed]
|
|
self.buffer = self.buffer[self.bufneed:]
|
|
self.bufneed = 4
|
|
self.bufstate = 0
|
|
return packet
|
|
|
|
def pollmessage(self, wait=0.0):
|
|
packet = self.pollpacket(wait)
|
|
if packet is None:
|
|
return None
|
|
try:
|
|
message = pickle.loads(packet)
|
|
except:
|
|
print >>sys.__stderr__, "-----------------------"
|
|
print >>sys.__stderr__, "cannot unpickle packet:", `packet`
|
|
traceback.print_stack(file=sys.__stderr__)
|
|
print >>sys.__stderr__, "-----------------------"
|
|
raise
|
|
return message
|
|
|
|
def pollresponse(self, myseq, wait=0.0):
|
|
# Loop while there's no more buffered input or until specific response
|
|
while 1:
|
|
message = self.pollmessage(wait)
|
|
if message is None:
|
|
return None
|
|
wait = 0.0
|
|
seq, resq = message
|
|
if resq[0] == "call":
|
|
response = self.localcall(resq)
|
|
self.putmessage((seq, response))
|
|
continue
|
|
elif seq == myseq:
|
|
return resq
|
|
else:
|
|
self.statelock.acquire()
|
|
self.responses[seq] = resq
|
|
cv = self.cvars.get(seq)
|
|
if cv is not None:
|
|
cv.notify()
|
|
self.statelock.release()
|
|
continue
|
|
|
|
class RemoteObject:
|
|
# Token mix-in class
|
|
pass
|
|
|
|
def remoteref(obj):
|
|
oid = id(obj)
|
|
objecttable[oid] = obj
|
|
return RemoteProxy(oid)
|
|
|
|
class RemoteProxy:
|
|
|
|
def __init__(self, oid):
|
|
self.oid = oid
|
|
|
|
class RPCHandler(SocketServer.BaseRequestHandler, SocketIO):
|
|
|
|
debugging = 0
|
|
|
|
def __init__(self, sock, addr, svr):
|
|
svr.current_handler = self ## cgt xxx
|
|
SocketIO.__init__(self, sock)
|
|
SocketServer.BaseRequestHandler.__init__(self, sock, addr, svr)
|
|
|
|
def setup(self):
|
|
SocketServer.BaseRequestHandler.setup(self)
|
|
print >>sys.__stderr__, "Connection from", self.client_address
|
|
|
|
def finish(self):
|
|
print >>sys.__stderr__, "End connection from", self.client_address
|
|
SocketServer.BaseRequestHandler.finish(self)
|
|
|
|
def handle(self):
|
|
self.mainloop()
|
|
|
|
def get_remote_proxy(self, oid):
|
|
return RPCProxy(self, oid)
|
|
|
|
class RPCClient(SocketIO):
|
|
|
|
nextseq = 1 # Requests coming from the client are odd
|
|
|
|
def __init__(self, address, family=socket.AF_INET, type=socket.SOCK_STREAM):
|
|
sock = socket.socket(family, type)
|
|
sock.connect(address)
|
|
SocketIO.__init__(self, sock)
|
|
|
|
def get_remote_proxy(self, oid):
|
|
return RPCProxy(self, oid)
|
|
|
|
class RPCProxy:
|
|
|
|
__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 not self.__attributes.has_key(name):
|
|
raise AttributeError, name
|
|
__getattr__.DebuggerStepThrough=1
|
|
|
|
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 type(obj) == types.InstanceType:
|
|
_getmethods(obj.__class__, methods)
|
|
if type(obj) == types.ClassType:
|
|
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:
|
|
|
|
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
|
|
|
|
#
|
|
# Self Test
|
|
#
|
|
|
|
def testServer(addr):
|
|
class RemotePerson:
|
|
def __init__(self,name):
|
|
self.name = name
|
|
def greet(self, name):
|
|
print "(someone called greet)"
|
|
print "Hello %s, I am %s." % (name, self.name)
|
|
print
|
|
def getName(self):
|
|
print "(someone called getName)"
|
|
print
|
|
return self.name
|
|
def greet_this_guy(self, name):
|
|
print "(someone called greet_this_guy)"
|
|
print "About to greet %s ..." % name
|
|
remote_guy = self.server.current_handler.get_remote_proxy(name)
|
|
remote_guy.greet("Thomas Edison")
|
|
print "Done."
|
|
print
|
|
|
|
person = RemotePerson("Thomas Edison")
|
|
svr = RPCServer(addr)
|
|
svr.register('thomas', person)
|
|
person.server = svr # only required if callbacks are used
|
|
|
|
# svr.serve_forever()
|
|
svr.handle_request() # process once only
|
|
|
|
def testClient(addr):
|
|
|
|
#
|
|
# demonstrates RPC Client
|
|
#
|
|
import time
|
|
clt=RPCClient(addr)
|
|
thomas = clt.get_remote_proxy("thomas")
|
|
print "The remote person's name is ..."
|
|
print thomas.getName()
|
|
# print clt.remotecall("thomas", "getName", (), {})
|
|
print
|
|
time.sleep(1)
|
|
print "Getting remote thomas to say hi..."
|
|
thomas.greet("Alexander Bell")
|
|
#clt.remotecall("thomas","greet",("Alexander Bell",), {})
|
|
print "Done."
|
|
print
|
|
time.sleep(2)
|
|
|
|
# demonstrates remote server calling local instance
|
|
class LocalPerson:
|
|
def __init__(self,name):
|
|
self.name = name
|
|
def greet(self, name):
|
|
print "You've greeted me!"
|
|
def getName(self):
|
|
return self.name
|
|
person = LocalPerson("Alexander Bell")
|
|
clt.register("alexander",person)
|
|
thomas.greet_this_guy("alexander")
|
|
# clt.remotecall("thomas","greet_this_guy",("alexander",), {})
|
|
|
|
def test():
|
|
addr=("localhost",8833)
|
|
if len(sys.argv) == 2:
|
|
if sys.argv[1]=='-server':
|
|
testServer(addr)
|
|
return
|
|
testClient(addr)
|
|
|
|
if __name__ == '__main__':
|
|
test()
|
|
|
|
|