从另一个文件访问SocketIO

Question

我试图向从单独文件连接的所有套接字发出信号。但我似乎无法弄清楚。

Socket.js

var socketio = require('socket.io');
var users = require('./modules/users');

var io = socketio();
socket.io = io;

io.on('connection', function(socket){
  //Stuff
  console.log('Hello :)');
});

module.exports = socket;

用户.js

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

function news(){
    socket.io.sockets.emit('news', {
        message: 'Woah! Thats new :)'
    })
}

setInterval(function(){
    news();
}, 5 * 1000);

但是，socket在 users.js 中似乎是空的，我似乎无法访问 io 对象。我怎样才能将其发送给所有用户？不将 io.sockets 解析为新闻函数或将我的函数移至套接字文件？

Answer 1

您可以使用 let 作为 utils 和 io 函数中的全局变量来定义 io 对象。您可以从任何文件调用这些函数。例如：

// app.js

const { socketConnection } = require('./utils/socket-io');
const http = require('http');
const express = require('express');

const app = express();
const server = http.createServer(app);
socketConnection(server);

// utils/socket-io

let io;
exports.socketConnection = (server) => {
  io = require('socket.io')(server);
  io.on('connection', (socket) => {
    console.info(`Client connected [id=${socket.id}]`);
    socket.join(socket.request._query.id);
    socket.on('disconnect', () => {
      console.info(`Client disconnected [id=${socket.id}]`);
    });
  });
};

exports.sendMessage = (roomId, key, message) => io.to(roomId).emit(key, message);

exports.getRooms = () => io.sockets.adapter.rooms;

// any file

const { sendMessage } = require('../utils/socket-io');

const foo = async () => {
  const roomId = '12345';
  const key = 'new-order';
  const message = 'new order assigned';
  
  sendMessage(roomId, key, message);
};

Answer 2

只是创建了一个socket service对象，服务对象只发布了一些helper功能。

您的案例示例：

// Socket.js
var socketio = require('socket.io');
var users = require('./modules/users');

var io = socketio();
socket.io = io;

io.on('connection', function (socket) {
  //Stuff
  console.log('Hello :)');
});

var toAll = function (eventName, data) {
  io.sockets.emit(event, data);
}

module.exports = {
  toAll: toAll // publish `toAll` function to call every where
};


// Users.js
var socketService = require('../socket');

function news() {
  socketService.toAll('news', {
    message: 'Woah! Thats new :)'
  });
}

setInterval(function () {
  news();
}, 5 * 1000);