socket.js

const SocketIO = require('socket.io');

module.exports = (server, app) => {
  const io = SocketIO(server, { path: '/socket.io', cors:{
    origin:"*",
    methods:["GET","POST"],
  } });
  app.set('io', io);
  const room = io.of('/room');
  const chat = io.of('/chat');


  room.on('connection', (socket) => {
    console.log('room 네임스페이스에 접속');
    socket.on('disconnect', () => {
      console.log('room 네임스페이스 접속 해제');
    });
  });

  chat.on('connection', (socket) => {
    console.log('chat 네임스페이스에 접속');
    const req = socket.request;
    const { headers: { referer } } = req;
    const roomId = referer
      .split('/')[referer.split('/').length - 1]
      .replace(/\?.+/, '');
    socket.join(roomId);

    socket.on('disconnect', () => {
      console.log('chat 네임스페이스 접속 해제');
      socket.leave(roomId);     
    });

    socket.on('chat', (data) => {
      socket.to(data.room).emit(data);
    });
  });
};