如何在node.js和socket.io app中组织套接字处理

Question

对于我的REST api,我为每条路线创建了一个文件.

app.get('/api/user', routes.user.index);
app.get('/api/user/login', routes.user.login);

等等

现在我将socket.io引入后端,似乎我只能为所有套接字事件调用一个函数.

var socket = require('./socket/stuff.js');

io.sockets.on('connection', function(sock){
    socket.stuff(sock, io);
});

我应该如何分解./socket/stuff.js文件(导出stuff).分成单独的文件.我想最终用套接字替换我的REST api,但我不希望一切都在一个文件中.

我想我会:

./socket/chat.js
./socket/user.js

等等

Answer 1

要在不同的文件中组织事件处理程序,可以使用如下结构:

./main.js

var io = require('socket.io');
var Chat = require('./EventHandlers/Chat');
var User = require('./EventHandlers/User');

var app = {
    allSockets: []
};

io.sockets.on('connection', function (socket) {

    // Create event handlers for this socket
    var eventHandlers = {
        chat: new Chat(app, socket),
        user: new User(app, socket)
    };

    // Bind events to handlers
    for (var category in eventHandlers) {
        var handler = eventHandlers[category].handler;
        for (var event in handler) {
            socket.on(event, handler[event]);
        }
    }

    // Keep track of the socket
    app.allSockets.push(socket);
});

./EventHandlers/Chat.js

var Chat = function (app, socket) {
    this.app = app;
    this.socket = socket;

    // Expose handler methods for events
    this.handler = {
        message: message.bind(this) // use the bind function to access this.app
        ping:    ping.bind(this)    // and this.socket in events
    };
}

// Events

function message(text) {
    // Broadcast message to all sockets
    this.app.allSockets.emit('message', text);
});

function ping() {
    // Reply to sender
    this.socket.emit('message', 'PONG!');
});

module.exports = Chat;