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4d92158f4c
Part 3 of 3, continuing PR #7689. This covers 14 idlelib modules and their tests, rpc to zoomheight except for run (already done) and tooltip (being done separately).
636 lines
21 KiB
Python
636 lines
21 KiB
Python
"""RPC Implementation, originally written for the Python Idle IDE
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For security reasons, GvR requested that Idle's Python execution server process
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connect to the Idle process, which listens for the connection. Since Idle has
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only one client per server, this was not a limitation.
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+---------------------------------+ +-------------+
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| socketserver.BaseRequestHandler | | SocketIO |
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+---------------------------------+ +-------------+
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^ | register() |
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| | unregister()|
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| +-------------+
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| ^ ^
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| | |
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| + -------------------+ |
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| | |
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+-------------------------+ +-----------------+
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| RPCHandler | | RPCClient |
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| [attribute of RPCServer]| | |
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+-------------------------+ +-----------------+
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The RPCServer handler class is expected to provide register/unregister methods.
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RPCHandler inherits the mix-in class SocketIO, which provides these methods.
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See the Idle run.main() docstring for further information on how this was
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accomplished in Idle.
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"""
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import builtins
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import copyreg
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import io
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import marshal
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import os
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import pickle
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import queue
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import select
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import socket
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import socketserver
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import struct
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import sys
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import threading
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import traceback
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import types
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def unpickle_code(ms):
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"Return code object from marshal string ms."
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co = marshal.loads(ms)
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assert isinstance(co, types.CodeType)
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return co
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def pickle_code(co):
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"Return unpickle function and tuple with marshalled co code object."
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assert isinstance(co, types.CodeType)
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ms = marshal.dumps(co)
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return unpickle_code, (ms,)
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def dumps(obj, protocol=None):
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"Return pickled (or marshalled) string for obj."
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# IDLE passes 'None' to select pickle.DEFAULT_PROTOCOL.
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f = io.BytesIO()
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p = CodePickler(f, protocol)
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p.dump(obj)
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return f.getvalue()
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class CodePickler(pickle.Pickler):
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dispatch_table = {types.CodeType: pickle_code}
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dispatch_table.update(copyreg.dispatch_table)
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BUFSIZE = 8*1024
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LOCALHOST = '127.0.0.1'
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class RPCServer(socketserver.TCPServer):
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def __init__(self, addr, handlerclass=None):
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if handlerclass is None:
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handlerclass = RPCHandler
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socketserver.TCPServer.__init__(self, addr, handlerclass)
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def server_bind(self):
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"Override TCPServer method, no bind() phase for connecting entity"
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pass
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def server_activate(self):
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"""Override TCPServer method, connect() instead of listen()
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Due to the reversed connection, self.server_address is actually the
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address of the Idle Client to which we are connecting.
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"""
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self.socket.connect(self.server_address)
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def get_request(self):
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"Override TCPServer method, return already connected socket"
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return self.socket, self.server_address
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def handle_error(self, request, client_address):
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"""Override TCPServer method
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Error message goes to __stderr__. No error message if exiting
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normally or socket raised EOF. Other exceptions not handled in
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server code will cause os._exit.
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"""
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try:
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raise
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except SystemExit:
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raise
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except:
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erf = sys.__stderr__
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print('\n' + '-'*40, file=erf)
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print('Unhandled server exception!', file=erf)
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print('Thread: %s' % threading.current_thread().name, file=erf)
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print('Client Address: ', client_address, file=erf)
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print('Request: ', repr(request), file=erf)
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traceback.print_exc(file=erf)
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print('\n*** Unrecoverable, server exiting!', file=erf)
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print('-'*40, file=erf)
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os._exit(0)
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#----------------- end class RPCServer --------------------
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objecttable = {}
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request_queue = queue.Queue(0)
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response_queue = queue.Queue(0)
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class SocketIO(object):
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nextseq = 0
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def __init__(self, sock, objtable=None, debugging=None):
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self.sockthread = threading.current_thread()
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if debugging is not None:
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self.debugging = debugging
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self.sock = sock
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if objtable is None:
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objtable = objecttable
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self.objtable = objtable
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self.responses = {}
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self.cvars = {}
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def close(self):
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sock = self.sock
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self.sock = None
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if sock is not None:
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sock.close()
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def exithook(self):
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"override for specific exit action"
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os._exit(0)
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def debug(self, *args):
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if not self.debugging:
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return
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s = self.location + " " + str(threading.current_thread().name)
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for a in args:
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s = s + " " + str(a)
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print(s, file=sys.__stderr__)
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def register(self, oid, object):
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self.objtable[oid] = object
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def unregister(self, oid):
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try:
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del self.objtable[oid]
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except KeyError:
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pass
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def localcall(self, seq, request):
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self.debug("localcall:", request)
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try:
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how, (oid, methodname, args, kwargs) = request
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except TypeError:
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return ("ERROR", "Bad request format")
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if oid not in self.objtable:
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return ("ERROR", "Unknown object id: %r" % (oid,))
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obj = self.objtable[oid]
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if methodname == "__methods__":
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methods = {}
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_getmethods(obj, methods)
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return ("OK", methods)
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if methodname == "__attributes__":
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attributes = {}
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_getattributes(obj, attributes)
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return ("OK", attributes)
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if not hasattr(obj, methodname):
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return ("ERROR", "Unsupported method name: %r" % (methodname,))
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method = getattr(obj, methodname)
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try:
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if how == 'CALL':
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ret = method(*args, **kwargs)
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if isinstance(ret, RemoteObject):
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ret = remoteref(ret)
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return ("OK", ret)
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elif how == 'QUEUE':
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request_queue.put((seq, (method, args, kwargs)))
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return("QUEUED", None)
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else:
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return ("ERROR", "Unsupported message type: %s" % how)
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except SystemExit:
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raise
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except KeyboardInterrupt:
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raise
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except OSError:
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raise
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except Exception as ex:
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return ("CALLEXC", ex)
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except:
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msg = "*** Internal Error: rpc.py:SocketIO.localcall()\n\n"\
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" Object: %s \n Method: %s \n Args: %s\n"
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print(msg % (oid, method, args), file=sys.__stderr__)
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traceback.print_exc(file=sys.__stderr__)
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return ("EXCEPTION", None)
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def remotecall(self, oid, methodname, args, kwargs):
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self.debug("remotecall:asynccall: ", oid, methodname)
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seq = self.asynccall(oid, methodname, args, kwargs)
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return self.asyncreturn(seq)
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def remotequeue(self, oid, methodname, args, kwargs):
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self.debug("remotequeue:asyncqueue: ", oid, methodname)
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seq = self.asyncqueue(oid, methodname, args, kwargs)
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return self.asyncreturn(seq)
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def asynccall(self, oid, methodname, args, kwargs):
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request = ("CALL", (oid, methodname, args, kwargs))
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seq = self.newseq()
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if threading.current_thread() != self.sockthread:
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cvar = threading.Condition()
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self.cvars[seq] = cvar
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self.debug(("asynccall:%d:" % seq), oid, methodname, args, kwargs)
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self.putmessage((seq, request))
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return seq
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def asyncqueue(self, oid, methodname, args, kwargs):
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request = ("QUEUE", (oid, methodname, args, kwargs))
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seq = self.newseq()
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if threading.current_thread() != self.sockthread:
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cvar = threading.Condition()
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self.cvars[seq] = cvar
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self.debug(("asyncqueue:%d:" % seq), oid, methodname, args, kwargs)
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self.putmessage((seq, request))
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return seq
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def asyncreturn(self, seq):
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self.debug("asyncreturn:%d:call getresponse(): " % seq)
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response = self.getresponse(seq, wait=0.05)
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self.debug(("asyncreturn:%d:response: " % seq), response)
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return self.decoderesponse(response)
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def decoderesponse(self, response):
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how, what = response
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if how == "OK":
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return what
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if how == "QUEUED":
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return None
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if how == "EXCEPTION":
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self.debug("decoderesponse: EXCEPTION")
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return None
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if how == "EOF":
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self.debug("decoderesponse: EOF")
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self.decode_interrupthook()
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return None
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if how == "ERROR":
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self.debug("decoderesponse: Internal ERROR:", what)
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raise RuntimeError(what)
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if how == "CALLEXC":
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self.debug("decoderesponse: Call Exception:", what)
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raise what
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raise SystemError(how, what)
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def decode_interrupthook(self):
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""
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raise EOFError
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def mainloop(self):
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"""Listen on socket until I/O not ready or EOF
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pollresponse() will loop looking for seq number None, which
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never comes, and exit on EOFError.
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"""
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try:
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self.getresponse(myseq=None, wait=0.05)
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except EOFError:
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self.debug("mainloop:return")
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return
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def getresponse(self, myseq, wait):
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response = self._getresponse(myseq, wait)
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if response is not None:
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how, what = response
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if how == "OK":
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response = how, self._proxify(what)
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return response
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def _proxify(self, obj):
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if isinstance(obj, RemoteProxy):
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return RPCProxy(self, obj.oid)
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if isinstance(obj, list):
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return list(map(self._proxify, obj))
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# XXX Check for other types -- not currently needed
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return obj
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def _getresponse(self, myseq, wait):
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self.debug("_getresponse:myseq:", myseq)
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if threading.current_thread() is self.sockthread:
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# this thread does all reading of requests or responses
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while 1:
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response = self.pollresponse(myseq, wait)
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if response is not None:
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return response
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else:
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# wait for notification from socket handling thread
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cvar = self.cvars[myseq]
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cvar.acquire()
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while myseq not in self.responses:
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cvar.wait()
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response = self.responses[myseq]
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self.debug("_getresponse:%s: thread woke up: response: %s" %
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(myseq, response))
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del self.responses[myseq]
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del self.cvars[myseq]
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cvar.release()
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return response
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def newseq(self):
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self.nextseq = seq = self.nextseq + 2
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return seq
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def putmessage(self, message):
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self.debug("putmessage:%d:" % message[0])
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try:
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s = dumps(message)
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except pickle.PicklingError:
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print("Cannot pickle:", repr(message), file=sys.__stderr__)
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raise
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s = struct.pack("<i", len(s)) + s
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while len(s) > 0:
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try:
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r, w, x = select.select([], [self.sock], [])
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n = self.sock.send(s[:BUFSIZE])
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except (AttributeError, TypeError):
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raise OSError("socket no longer exists")
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s = s[n:]
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buff = b''
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bufneed = 4
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bufstate = 0 # meaning: 0 => reading count; 1 => reading data
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def pollpacket(self, wait):
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self._stage0()
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if len(self.buff) < self.bufneed:
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r, w, x = select.select([self.sock.fileno()], [], [], wait)
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if len(r) == 0:
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return None
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try:
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s = self.sock.recv(BUFSIZE)
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except OSError:
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raise EOFError
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if len(s) == 0:
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raise EOFError
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self.buff += s
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self._stage0()
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return self._stage1()
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def _stage0(self):
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if self.bufstate == 0 and len(self.buff) >= 4:
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s = self.buff[:4]
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self.buff = self.buff[4:]
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self.bufneed = struct.unpack("<i", s)[0]
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self.bufstate = 1
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def _stage1(self):
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if self.bufstate == 1 and len(self.buff) >= self.bufneed:
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packet = self.buff[:self.bufneed]
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self.buff = self.buff[self.bufneed:]
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self.bufneed = 4
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self.bufstate = 0
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return packet
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def pollmessage(self, wait):
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packet = self.pollpacket(wait)
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if packet is None:
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return None
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try:
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message = pickle.loads(packet)
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except pickle.UnpicklingError:
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print("-----------------------", file=sys.__stderr__)
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print("cannot unpickle packet:", repr(packet), file=sys.__stderr__)
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traceback.print_stack(file=sys.__stderr__)
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print("-----------------------", file=sys.__stderr__)
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raise
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return message
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def pollresponse(self, myseq, wait):
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"""Handle messages received on the socket.
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Some messages received may be asynchronous 'call' or 'queue' requests,
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and some may be responses for other threads.
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'call' requests are passed to self.localcall() with the expectation of
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immediate execution, during which time the socket is not serviced.
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'queue' requests are used for tasks (which may block or hang) to be
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processed in a different thread. These requests are fed into
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request_queue by self.localcall(). Responses to queued requests are
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taken from response_queue and sent across the link with the associated
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sequence numbers. Messages in the queues are (sequence_number,
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request/response) tuples and code using this module removing messages
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from the request_queue is responsible for returning the correct
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sequence number in the response_queue.
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pollresponse() will loop until a response message with the myseq
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sequence number is received, and will save other responses in
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self.responses and notify the owning thread.
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"""
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while 1:
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# send queued response if there is one available
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try:
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qmsg = response_queue.get(0)
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except queue.Empty:
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pass
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else:
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seq, response = qmsg
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message = (seq, ('OK', response))
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self.putmessage(message)
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# poll for message on link
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try:
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message = self.pollmessage(wait)
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if message is None: # socket not ready
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return None
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except EOFError:
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self.handle_EOF()
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return None
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except AttributeError:
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return None
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seq, resq = message
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how = resq[0]
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self.debug("pollresponse:%d:myseq:%s" % (seq, myseq))
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# process or queue a request
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if how in ("CALL", "QUEUE"):
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self.debug("pollresponse:%d:localcall:call:" % seq)
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response = self.localcall(seq, resq)
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self.debug("pollresponse:%d:localcall:response:%s"
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% (seq, response))
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if how == "CALL":
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self.putmessage((seq, response))
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elif how == "QUEUE":
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# don't acknowledge the 'queue' request!
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pass
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continue
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# return if completed message transaction
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elif seq == myseq:
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return resq
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# must be a response for a different thread:
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else:
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cv = self.cvars.get(seq, None)
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# response involving unknown sequence number is discarded,
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# probably intended for prior incarnation of server
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if cv is not None:
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cv.acquire()
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self.responses[seq] = resq
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cv.notify()
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cv.release()
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continue
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def handle_EOF(self):
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"action taken upon link being closed by peer"
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self.EOFhook()
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self.debug("handle_EOF")
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for key in self.cvars:
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cv = self.cvars[key]
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cv.acquire()
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self.responses[key] = ('EOF', None)
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cv.notify()
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cv.release()
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# call our (possibly overridden) exit function
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self.exithook()
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def EOFhook(self):
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"Classes using rpc client/server can override to augment EOF action"
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pass
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#----------------- end class SocketIO --------------------
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class RemoteObject(object):
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# Token mix-in class
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pass
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def remoteref(obj):
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oid = id(obj)
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objecttable[oid] = obj
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return RemoteProxy(oid)
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class RemoteProxy(object):
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def __init__(self, oid):
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self.oid = oid
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class RPCHandler(socketserver.BaseRequestHandler, SocketIO):
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debugging = False
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location = "#S" # Server
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def __init__(self, sock, addr, svr):
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svr.current_handler = self ## cgt xxx
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SocketIO.__init__(self, sock)
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socketserver.BaseRequestHandler.__init__(self, sock, addr, svr)
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def handle(self):
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"handle() method required by socketserver"
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self.mainloop()
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def get_remote_proxy(self, oid):
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return RPCProxy(self, oid)
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class RPCClient(SocketIO):
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debugging = False
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location = "#C" # Client
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nextseq = 1 # Requests coming from the client are odd numbered
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def __init__(self, address, family=socket.AF_INET, type=socket.SOCK_STREAM):
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self.listening_sock = socket.socket(family, type)
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self.listening_sock.bind(address)
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self.listening_sock.listen(1)
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def accept(self):
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working_sock, address = self.listening_sock.accept()
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if self.debugging:
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print("****** Connection request from ", address, file=sys.__stderr__)
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|
if address[0] == LOCALHOST:
|
|
SocketIO.__init__(self, working_sock)
|
|
else:
|
|
print("** Invalid host: ", address, file=sys.__stderr__)
|
|
raise OSError
|
|
|
|
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
|
|
|
|
|
|
if __name__ == '__main__':
|
|
from unittest import main
|
|
main('idlelib.idle_test.test_rpc', verbosity=2,)
|