Python远程方法调用实现过程解析

import json
from multiprocessing.connection import Listener
from threading import Thread


class RPCHandler:
  def __init__(self):
    self._functions = {}

  def register_function(self, func):
    self._functions[func.__name__] = func

  def handle_connection(self, connection):
    try:
      while True:
        func_name, args, kwargs = json.loads(connection.recv())
        # Run the RPC and send a response
        try:
          r = self._functions[func_name](*args, **kwargs)
          connection.send(json.dumps(r))
        except Exception as e:
          connection.send(json.dumps(e))
    except EOFError:
      pass


def rpc_server(handler, address, authkey):
  sock = Listener(address, authkey=authkey)
  while True:
    client = sock.accept()
    t = Thread(target=handler.handle_connection, args=(client,))
    t.daemon = True
    t.start()
# Some remote functions
def add(x,y):
  return x+y


if __name__ == '__main__':
  handler = RPCHandler()
  handler.register_function(add)
  # Run the server
  rpc_server(handler, ('127.0.0.1', 17000), authkey=b'peekaboo')

import json
from multiprocessing.connection import Client


class RPCProxy:

  def __init__(self, connection):
    self._connection = connection

  def __getattr__(self, name):
    def do_rpc(*args, **kwargs):
      self._connection.send(json.dumps((name, args, kwargs)))
      result = json.loads(self._connection.recv())
      if isinstance(result, Exception):
        raise result
      return result

    return do_rpc
if __name__ == '__main__':
  c = Client(('127.0.0.1', 17000), authkey=b'peekaboo')
  proxy = RPCProxy(c)
  res = proxy.add(2, 3)
  print(res)