evens_and_odds.py

import socket
import struct
import time

JOIN = 0
PLAY = 1


class EvensAndOddsServer:

    def __init__(self, address, port):
        self.address = address
        self.port = port
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.socket.bind((self.address, self.port))
        self.in_game = False
        self.players = {}

    def tick(self):
        self.packet, self.sender = self.socket.recvfrom(64)
        if len(self.packet) <= 0:
            return
        command, value = struct.unpack('=BB', self.packet)
        if command == JOIN:
            self.join(value)
        elif command == PLAY:
            self.play(value)

        if not self.in_game:
            if len(self.players) == 2:
                self.in_game = True

        total = 0

        if self.in_game:
            for move in self.players.values():
                if move is None:
                    return
                total += move
        else:
            return

        # if i am here, check victory
        if total % 2 == 0:
            print('EVEN WINS')
        else:
            print('ODD WINS')

        self.players = {}
        self.in_game = False

    def join(self, value):
        if self.in_game:
            return
        if len(self.players) == 2:
            return
        print('player {} joined'.format(self.sender))
        self.players[self.sender] = None

    def play(self, value):
        if not self.in_game:
            return
        if not self.sender in self.players:
            return
        print('player {} moved: {}'.format(self.sender, value))
        self.players[self.sender] = value

    def run(self):
        print('server is running')
        while True:
            self.tick()


game = EvensAndOddsServer('192.168.10.1', 9999)
game.run()