Python XMLRPC:即使在 allow_none = True 之后也不允许 None

Question

我正在尝试编写一个简单的应用程序，该应用程序使用 RPC 进行通信。我正在使用python 3.7的xmlrpc。

这是我的服务器代码

MY_ADDR = ("localhost", int(sys.argv[1]))
HOST_ADDR = ("localhost", int(sys.argv[2]))
class RpcServer(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.port = MY_ADDR[1]
self.addr = MY_ADDR[0]
# serve other hosts using this
self.server = SimpleXMLRPCServer((self.addr, self.port))
self.server.register_function(self.recv_ops)
def run(self):
self.server.serve_forever()
def recv_ops(self, sender, op):
print("Sender ", sender, " sent: ", op)
pass

这就是我用作客户代码的内容

def send_ops(host_addr, op):
# contact the other host using this
proxy_addr = "http://{addr}:{port}/".format(addr=host_addr[0], port=host_addr[1])
client_proxy = xmlrpc.client.ServerProxy(proxy_addr, allow_none=True)
resp = client_proxy.recv_ops(MY_ADDR, op)
...
send_ops(HOST_ADDR, ("d", ii, last_line[ii])) # THE RPC CALL I MAKE

尽管设置了 allow_none=True，但我仍然得到这个：

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "nb.py", line 102, in editor
send_ops(HOST_ADDR, ("d", ii, last_line[ii]))
File "nb.py", line 63, in send_ops
resp = client_proxy.recv_ops(MY_ADDR, op)
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 1112, in __call__
return self.__send(self.__name, args)
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 1452, in __request
verbose=self.__verbose
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 1154, in request
return self.single_request(host, handler, request_body, verbose)
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 1170, in single_request
return self.parse_response(resp)
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 1342, in parse_response
return u.close()
File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xmlrpc/client.py", line 656, in close
raise Fault(**self._stack[0])
xmlrpc.client.Fault: <Fault 1: "<class 'TypeError'>:cannot marshal None unless allow_none is enabled">

让我绊倒的是另一端的服务器实际上收到了消息(没有任何 None(

Sender  ['localhost', 8001]  sent:  ['d', 4, 'o']

我在这里错过了什么？任何帮助将不胜感激。

谢谢！

Answer 1

在服务器类中，将allow_none=True添加到SimpleXMLRPCServer实例化中。

self.server = SimpleXMLRPCServer((self.addr, self.port), allow_none=True)

allow_none和编码参数将传递给 xmlrpc.client，并控制将从服务器返回的 XML-RPC 响应。