UDP_client_server/server.py

import socket, sys, datetime, threading, json

class Server:
    def __init__(self):
        self.version = 1.0
        print("Server version: {}".format(self.version))
        self.motd = "cubey"
        self.color = 0xe973ea
        self.users = []

        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        print("Created socket object")

        self.ip = "0.0.0.0" 
        self.port = 1337
        self.address = (self.ip, self.port)
        self.sock.bind(self.address)
        print("Server started up on {}".format(self.address))

    def send(self, data, client):
        data = json.dumps(data).encode()
        self.sock.sendto(data, client)

    def send_all(self, data):
        for user in self.users:
            self.send(data, user)

    def connection(self, address, connecting_client_name):
        print("New connection from {}".format(address))
        a = {"header":"connection",
             "motd":self.motd,
             "color":self.color,
             "client name":connecting_client_name}
        print(">> " + connecting_client_name + " <<")
        self.users.append(address)
        self.send_all(a)

    def run(self):
        while True:
            try:
                data, addr = self.sock.recvfrom(65507)
                a = json.loads(data)
                header = a["header"]
                client_name = a["client name"]

                if header == "connection":
                    self.connection(addr, client_name)
                elif header == "message":
                    message = a["message"]
                    print(client_name + " >> " + message)
                    response = {"header":"response",
                                "message":message,
                                "color":0xffffff,
                                "client name":client_name}
                    if addr not in self.users:
                        self.users.append(addr)
                    self.send_all(response)
            except OSError:
                return

class Commands:
    def __init__(self):
        self.commands={"test":self.test,
                       "stop":self.stop}
        self.running = True

    def test(self):
        print("this is a test command")

    def stop(self):
        print("Stopping server...")
        server.sock.close()
        server_thread.join()
        self.running = False

    def run(self):
        while self.running:
            command = input()
            if command in self.commands:
                self.commands[command]()
            else:
                print("Unknown command")

server = Server()
commands = Commands()

server_thread = threading.Thread(target = server.run)
commands_thread = threading.Thread(target = commands.run)

server_thread.start()
commands_thread.start()