python XMLRPC函数错误

Question

我尝试通过 XML RPC 连接两台计算机，但总是收到“[Errno -2] 名称或服务未知”消息。有时它有效，有时则无效，我不知道我做错了什么。这是我正在运行的代码

客户端(在一台计算机上):

from xmlrpclib import ServerProxy
import time
while True:
    try:
#        robot_file = open("robot_file", "r")
#        robot_uri = robot_file.readline()
        robot_uri = "http://pototo.local:12345"
        print("robot uri: " + robot_uri)
        server = ServerProxy(robot_uri)
#        robot_file.close()
#        os.remove("robot_file")
        print('removed robot_file')
        break
    except BaseException:
        print("trying to read robot uri")
        time.sleep(1)
        pass
print('processing request')
while True:
    try:
        print (server.getLocationInfo(2))
        time.sleep(1)
    except BaseException as e:
        print("trying to read request")
        print (e)
        time.sleep(1)

服务器(在另一台地址为“http://pototo.local:12345 ”的计算机上)

#!/usr/bin/env python
'''
This files runs indefinitelly  in a computer and waits for a client
to request connection to a/the robot(s)
'''

#import roslib;
#import rospy
#from sensor_msgs.msg import CompressedImage
#from sensor_msgs.msg import Image
#from std_msgs.msg import String

from SimpleXMLRPCServer import SimpleXMLRPCServer
import subprocess
from time import sleep
import string

pub_data = None    # gets the data from the publisher

python_string = string
location = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
occupied = ['n', 'n', 'n', 'n', 'n', 'n', 'n', 'n', 'n', 'n']
flagged = ['n', 'n', 'n', 'n', 'n', 'n', 'n', 'n', 'n', 'n']
dateTime = ['None','None','None','None','None','None','None','None',
            'None','None']
licensePlate = ['None','None','None','None','None','None','None',
                'None','None','None']
gps = ['None','None','None','None','None','None','None','None',
       'None','None']

def parking_callback(msg):

        #parses the string data
        infoList = msg.data.split(" ")
        location[int(infoList[0]) -1] = infoList[0]
        occupied[int(infoList[0]) -1] = infoList[1]
        flagged[int(infoList[0]) -1] = infoList[2]
        dateTime[int(infoList[0]) -1] = infoList[3]
        licensePlate[int(infoList[0]) -1] = infoList[4]

def getLocationInfo(locationNum):
    if ((locationNum > 10) and (locationNum < 1)):
        print "Out of bounds location\n"
        return
    index = locationNum - 1
    description = ('ID', 'occupied', 'flagged', 'dateTime',
                   'licensePlate', 'gps')
    descrip_data = (location[index], occupied[index],
                    flagged[index], dateTime[index],
                    licensePlate[index], gps[index])
    return dict(zip(description, descrip_data))

def start_process():
    '''
    Function that allows client to retrieve data from this server
    '''
    robot_address = ['http://G46VW:11311', '192.168.1.81']
    print(str(len(robot_address)) + ' robots are connected \n')
#    robot_address.append(os.environ['ROS_MASTER_URI'])
    robot_address.reverse()    # change uri as first key
    return robot_address
#    return location

def get_pub_data(published_data):
    '''
    Retrieves the published data from ROS and stores it on the
    pub_data variable
    '''
#   pub_data = published_data
    pass

if __name__ == '__main__':
    #rospy.init_node('sendGUI')
    #rospy.Subscriber('/parkingInfo', String, parking_callback)
    import platform
    hostname = platform.node()
    port = 12345
    server = SimpleXMLRPCServer((hostname, port))

    # run subscriber here
#    rospy.Subscriber("move", String, rover.set_move)

    # thread to run the subscriber
    #from threading import Thread
    #spin_thread = Thread(target=lambda: rospy.spin())
    #spin_thread.start()

    # store server address for meta client usage
    start = "http://"
    address = start + hostname + ":" + str(port)
    print('Robot URI: ' + address)
    uri_file = open("robot_file", "w")
    uri_file.write(address)
    uri_file.close()

    # send URI to client
#    import os
#    os.system("rsync -v -e ssh robot_file pototo@192.168.1.102:~/Desktop/gui")

    server.register_function(start_process, "start_process")
    server.register_function(getLocationInfo, "getLocationInfo")
    #while not rospy.is_shutdown():
    while True:
        try:       # handle requests for the rest of the program
            print('\nwaiting for a client to request...\n\n')
            server.handle_request()
        except BaseException: #rospy.ROSInterruptException:
            print('exiting ROS node')
#            spin_thread.kill()
            from sys import exit
            exit()

该服务器旨在作为 ROS 节点运行，但我在这里将其转换回正常的 python，以防万一您想运行它。如果您想运行它，请确保相应地更改 URI。

非常感谢

Answer 1

大多数情况下，该错误仅意味着无法连接到指定的主机。您是否尝试过对这些机器执行 ping 操作以确保它们正常运行？也可能是 python 无法解析 .local 主机(如果我没记错的话，它是 Apple bonjour 协议(protocol)的一部分)，您可能需要使用 IP 地址。