Python UDP recvfrom()特定地址

时间:2012-01-18 15:52:39

标签: python networking udp recv

我在这段代码中看到的问题是,尽管它正在运行,但是一些信息客户端(播放器)发送到此服务器时最终会以“clientRequests”结束方法“权限”,因为两者都是他们有recvfrom()。所以,如果我可以指定WHICH addr我希望信息作为recvfrom()的参数,它将解决它。我相信它可以用C ++,但它是用python,以及如何? 使用TCP,这个问题不存在,但我更喜欢UDP。

类似于:recvfrom(512,address =(ip,port))?

'permission'用于处理新客户连接。

问题在于,客户发送的职位,事件等信息将不会在“许可”中处理。

class Server:
    def __init__(self):
        #host = '192.168.0.2'
        host = '127.0.0.1'
        port = 50007
        addr = (host, port)
        self.UDPSock = socket(AF_INET, SOCK_DGRAM)
        self.UDPSock.bind(addr)
        self.UDPSock.settimeout(5.0)
        self.searchForClients = True
        self.playersOnline = []
        threading.Thread(target=self.permission).start()
        Gui.add_event("Server online on port %s" % port)


    def permission(self):
        global _status
        while self.searchForClients:
            time.sleep(0.5)
            _status.set("Status: Running; Connected: %s" % len(self.playersOnline))
            try:
                clientMessage, addr = self.UDPSock.recvfrom(1024) # , MSG_PEEK
            except:
                clientMessage = ""
            if clientMessage == "CONNECT" and addr not in self.playersOnline:                       
                if self.searchForClients:
                    self.addNewClient(addr)

            elif clientMessage == "DISCONNECT" and addr in self.playersOnline:
                self.removeClient(addr)

        Gui.add_event("No longer accepting logins")
        return False

    def clientRequests(self, addr):
        latestRequest = time.time()
        while addr in self.playersOnline:
            time.sleep(0.01)
            try:
                data, requestAddr = self.UDPSock.recvfrom(1024)
            except:
                requestAddr, data = "", ""
            if requestAddr == addr:
                latestRequest = time.time()
                dataCommand = data.split(':')
            if time.time() - latestRequest > 2:
                if addr in self.playersOnline:
                    self.removeClient(addr)

        if not self.searchForClients:       
            Gui.add_event("Player %s(%s) forcibly removed" % addr)
        return False

1 个答案:

答案 0 :(得分:1)

我认为线程不必要地使像这样的简单UDP服务器复杂化。只需监听套接字并根据是否已经看到数据包的源地址来调度呼叫。

不,常规recvfrom(2)系统调用不允许您“过滤”从中获取数据的地址,只是为了获取该信息。在UDP套接字上使用connect(2)进行过滤,但这限制了每个套接字的单个源。