如何判断客户端何时使用NodeJS断开与网络套接字的连接？

Question

我有一个Node websocket，我正在尝试检测客户端何时断开连接。我根据文档尝试了以下代码，但我仍然无法检测到闭合...

        const wss = new WebSocket.Server({
            server: this.server
        });
        this.wss = wss;
        this.wss.on('connection', function connection(ws) {
            Logger.log("verbose", `Web socket is now alive`);
            ws.isAlive = true;
            ws.on("pong", function(){
                Logger.log("verbose", `Web socket pong`);
                console.log(`the pong is ${this.isAlive} ${ws.isAlive}`);
                this.isAlive = true;
            });
        });
        setInterval(()=>{
            console.log(`Setting the interval ${wss.clients.length}`);
            wss.clients.forEach(function each(ws) {
                if (ws.isAlive === false){
                    Logger.log("verbose", `The web socket died`);
                    return ws.terminate();
                }
                ws.isAlive = false;
                ws.ping(()=>{});
            });
        }, 30000);

但是，在检测到wss.clients之前，它似乎是空的。如何检测实际关闭的连接？

更新

我还尝试了close事件和onclose函数，似乎都没有做我正在寻找的事情。

Answer 1

你在你的this.wss.on('connection', function connection(ws) {...})中寻找一个ws.on("close", function close() {...})。根据您的代码：

        const wss = new WebSocket.Server({
            server: this.server
        });
        this.wss = wss;
        this.wss.on('connection', function connection(ws) {
            Logger.log("verbose", `Web socket is now alive`);
            ws.isAlive = true;
            ws.on("pong", function(){
                Logger.log("verbose", `Web socket pong`);
                console.log(`the pong is ${this.isAlive} ${ws.isAlive}`);
                this.isAlive = true;
            });
            ws.on("close", function() {
                //do closing stuff here
            });
        });
        setInterval(()=>{
            console.log(`Setting the interval ${wss.clients.length}`);
            wss.clients.forEach(function each(ws) {
                if (ws.isAlive === false){
                    Logger.log("verbose", `The web socket died`);
                    return ws.terminate();
                }
                ws.isAlive = false;
                ws.ping(()=>{});
            });
        }, 30000);