javascript - 无法连接到 Google Cloud Compute Engine 上的 NodeJS WS 服务器

Question

我创建了两个 JavaScript 文件(一个服务器文件和一个客户端文件)来组成一个小型多人游戏。当我使用 node server.js 在本地运行服务器文件时，它开始运行。然后我可以使用 node client.js 运行客户端文件来玩游戏，一切正常。但是，当我尝试在 linux 实例(谷歌云上的计算引擎)上实时托管游戏时，我无法从客户端连接到它。我正在使用 ws nodeJS 中的 websockets 库。

代码如下:

服务器.js

const WebSocket = require('ws');
const util = require('util');

const wss = new WebSocket.Server({ port: 8889 });

var magicNum = Math.ceil(Math.random() * 5);
var champion = "James";
var connections = [];

console.log('server listening...');

wss.on('connection', function connection(ws) {

    connections.push({
        ws: ws,
        name: "",
        score: 0
    });

    ws.on('message', function incoming(message, flags) {

        var currentPlayer;

        for (var i = 0; i < connections.length; i++) {
            if (connections[i].ws === ws) {
                currentPlayer = connections[i];
            }
        }

        var response;
        var obj = JSON.parse(message);

        if (parseInt(obj.guess) === magicNum) {

            currentPlayer.score++;
            response = "HOLY COW! YOU GUESSED THE MAGIC NUMBER!!!" +
                "I now declare you, " + obj.name + ", the new champion! (You have correctly guessed ( "
                + currentPlayer.score + " ) numbers)";
            champion = obj.name;
            magicNum = Math.ceil(Math.random() * 5);

            ws.send(JSON.stringify({ response: response, prompt: true }));

            for (var i = 0; i < connections.length; i++) {
                if (connections[i].ws !== ws) {
                    response = "Uh oh, too slow! " + obj.name + " correctly guessed the number and is the new champion"
                        + " with " + currentPlayer.score + " correct guesses!";
                    connections[i].ws.send(JSON.stringify({ response: response, prompt: false }))
                }
            }

        } else {
            response = "Sorry, that's not the magic number. The champion is still " + champion + ".";
            ws.send(JSON.stringify({ response: response, prompt: true }));
        }

    });

    ws.on('close', function (a, b) {

        for (var i = 0; i < connections.length; i++) {
            if (connections[i].ws === ws) {
                connections.pop(i);
                console.log('removing connection from array');
            }
        }
        console.log('current connections now: ' + connections.length);
    })
});

客户端.js

const WebSocket = require('ws');
var prompt = require('prompt');

//const ws = new WebSocket('ws://localhost:8889');
const ws = new WebSocket('ws://35.185.74.130:8889');

var clientName = '';

function beginPromptForGuess() {

    var numberSchema = {
        properties: {
            number: {
                description: 'Please guess an integer between 1 and 20',
                pattern: /^\d+$/,
                message: 'please enter an integer.',
                required: true
            }
        }
    };

    console.log('prompt is: ' + prompt.stopped + " " + !prompt.started)

    if (prompt.stopped || !prompt.started) {
        console.log('starting prompt');

        prompt.get(numberSchema, function (err, result) {
            if (result) {
                console.log('got number');
                ws.send(JSON.stringify({ name: clientName, guess: result.number }));

            }
        })
    }
}

ws.on('open', function open() {

    setTimeout(function () {
        console.log('Hey, let\'s play a game!');

        var nameSchema = {
            properties: {
                name: {
                    description: 'First, what is your name?',
                    pattern: /^[a-zA-Z\s\-]+$/,
                    message: 'Name must be only letters, spaces, or dashes',
                    required: true
                }
            }
        };

        prompt.get(nameSchema, function (err, result) {
            if (result) {
                clientName = result.name;
                console.log('Hi there, ' + result.name + '!');
                console.log('Let\'s play!');
                beginPromptForGuess();
            }
        });
    }, 500);

});

ws.on('message', function incoming(data, flags) {
    var obj = JSON.parse(data);
    console.log('Server says: ' + obj.response);

    if (obj.prompt) {
        beginPromptForGuess();
    }
});

在我创建 linux 实例并使用 SSH“在浏览器窗口中打开”选项在目录 home/mrjim 中打开实例内部的 shell 之后。该实例已经有 Node ，所以我将服务器代码粘贴到一个文件中，运行 npm init 来创建一个 package.json 文件，安装 ws 库。然后我运行了 node server.js，它似乎工作正常:

但是，当我尝试从客户端连接到它时，shell 会挂起一段时间并给出以下输出:

events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 35.185.74.130:80
    at Object.exports._errnoException (util.js:1026:11)
    at exports._exceptionWithHostPort (util.js:1049:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1085:14)

我是不是对服务器文件的位置做错了什么，或者我是如何编写 ip/端口的？谢谢。

此外，这是我的 Linux 实例的 Google 云配置:

我也在防火墙规则中打开了端口，但我仍然无法从客户端连接:

Answer 1

在您的谷歌云设置的屏幕截图中，您似乎将外部 IP 设置为 *Ephemeral*。要从外部客户端(例如本地计算机的命令 shell)访问它，您应该将其更改为统计 ip。此外，对于多人游戏的后端，我建议使用更安全的 SSL 端口 443 而不是 8889。

祝你好运!