尽管在 Python 中使用 XMLRPC 时添加了 allow_none=True，但仍"cannot marshal None"错误

Question

我尝试在Python 中使用XMLRPC创建一个简单的下载和上传系统

这是客户端的代码（将此文件命名为client.py）

import sys
import xmlrpclib
import os
def return_pause():
    """Used for creating a pause during input"""
    raw_input("ntPress enter to continue")
def mod_file_download(file_name, local_port, remote_proxy, local_proxy):
    """Sending details to remote node which will send file to local node"""
    #print "till here"
    #print "{%s}t{%s}" % (file_name,local_proxy)
    remote_proxy.mod_file_transfer(file_name, local_proxy)
def mod_file_upload(file_path, file_name, remote_proxy):
    """Used for sending files to a receiver. Sent file will always have the name file_1.txt"""
    new_file_name = "file_1.txt"
    with open(file_path, "rb") as handle:
        bin_data = xmlrpclib.Binary(handle.read())
    remote_proxy.mod_file_receive(bin_data, new_file_name)
    return True
##MAIN MODULE STARTS HERE##
# Connection details of remote node
local_port = sys.argv[1]
# Getting details of remote node
remote_port = raw_input("ntEnter remote port ID : ")
# Creating connection details of remote node
remote_proxy = xmlrpclib.ServerProxy("http://localhost:" + remote_port + "/")
# Creating connection details of local node
local_proxy = xmlrpclib.ServerProxy("http://localhost:" + local_port + "/")
while True:
    os.system('clear')
    print "t. : Collab Menu for %s : .n" % local_port
    print "tSearch & download ...[1]"
    print "tUpload            ...[2]"
    print "tExit              ...[0]"
    input_val = raw_input("nntEnter option : ")
    if input_val == "1":
        file_name = raw_input("ntEnter name of file to be downloaded : ")
        mod_file_download(file_name, local_port, remote_proxy, local_proxy)
        return_pause()
    elif input_val == "2":
        file_name = raw_input("ntEnter name of file to be uploaded : ")
        file_path = "./" + file_name
        mod_file_upload(file_path, file_name, remote_proxy, local_proxy)
        return_pause()
    elif input_val == "0":
        print "tExiting"
        break
    else:
        print "tIncorrect option value"
        print "tTry again..."
        return_pause()
os.system('clear')

这是侦听器的代码（将此文件命名为listener.py）

import sys
import xmlrpclib
from SimpleXMLRPCServer import SimpleXMLRPCServer
def mod_file_transfer(file_name, requestor_proxy):
    """Initiating the file transfer"""
    print "[mod_file_transfer fired]"
    file_path = "./" + file_name
    print requestor_proxy
    with open(file_path, "rb") as handle:
        bin_data = xmlrpclib.Binary(handle.read())
    # Connecting to requestor's server
    requestor_proxy.mod_file_download_receive(bin_data, file_name)
    return True
def mod_file_receive(bin_data, file_name):
    """Used to receive a file upon a request of an upload"""
    print "[mod_file_receive fired]"
    new_file_name = "./" + file_name
    with open(new_file_name, "wb") as handle:
        handle.write(bin_data.data)
        return True
def mod_file_download_receive(bin_data, file_name):
    """Used to receive a file upon request of a download"""
    print "[mod_file_download_receive fired]"
    new_file_name = "./" + file_name + str(1)
    with open(new_file_name, "wb") as handle:
        handle.write(bin_data.data)
        return True
##MAIN MODULE STARTS HERE##
local_port = sys.argv[1]
# Declared an XMLRPC server
node = SimpleXMLRPCServer(("localhost", int(local_port)), logRequests=True, allow_none=True)
print "Listening on port %s..." % local_port
# Registered a list of functions
node.register_function(mod_file_transfer, 'mod_file_transfer')
node.register_function(mod_file_receive, 'mod_file_receive')
node.register_function(mod_file_download_receive, 'mod_file_download_receive')
# Initialized the XMLRPC server
node.serve_forever()

如何启动系统

1. 将两个文件放在同一目录中
2. 执行以下命令
3. python侦听器9000
4. python侦听器9500
5. python客户端9000（然后将远程客户端端口作为9500作为输入）
6. python客户端9500（然后将远程客户端端口作为9000作为输入）

文件上传工作正常

但文件下载不起作用

它给了我以下错误

Traceback (most recent call last):
  File "collab_client.py", line 57, in <module>
    mod_file_download(file_name, local_port, remote_proxy, local_proxy)
  File "collab_client.py", line 17, in mod_file_download
    remote_proxy.mod_file_transfer(file_name, local_proxy)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1240, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1593, in __request
    allow_none=self.__allow_none)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1091, in dumps
    data = m.dumps(params)
  File "/usr/lib/python2.7/xmlrpclib.py", line 638, in dumps
    dump(v, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 660, in __dump
    f(self, value, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 762, in dump_instance
    self.dump_struct(value.__dict__, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 741, in dump_struct
    dump(v, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 660, in __dump
    f(self, value, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 762, in dump_instance
    self.dump_struct(value.__dict__, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 741, in dump_struct
    dump(v, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 660, in __dump
    f(self, value, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 720, in dump_array
    dump(v, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 660, in __dump
    f(self, value, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 664, in dump_nil
    raise TypeError, "cannot marshal None unless allow_none is enabled"
TypeError: cannot marshal None unless allow_none is enabled

但我已经在侦听器文件中给出了选项allow_none=True

我哪里出错了

Answer 1

我在头疼之后发现了它。似乎无法发送或整理连接详细信息。在函数mod_file_transfer中，我试图将客户端连接详细信息作为对象发送（这样服务器就知道必须将文件发送给谁），这导致了错误。

我只是简单地将客户端连接的详细信息作为字符串发送，它就工作了。谢谢我！