signal-webrtc/server.js

const express = require('express')
const app = express()
const server = require('http').Server(app)
const io = require('socket.io')(server)
const { v4: uuidV4 } = require('uuid')

const connectedClients = {} // {"roomId1": ["userId1", "userId2"], "roomId2" : ["userId3"]}

app.set('view engine', 'ejs')
app.use(express.static('public'))

app.get('/', (req, res) => {
  res.redirect(`/${uuidV4()}`)
})

app.get('/:room', (req, res) => {
  res.render('room', { roomId: req.params.room })
})

io.on('connection', socket => {

  socket.on('join-room', (roomId, userId) => {
    if(!(roomId in connectedClients)){
      connectedClients[roomId] = []
    }
    socket.emit('connected-clients', connectedClients[roomId]);
    connectedClients[roomId].push(userId)
    socket.join(roomId)
    socket.to(roomId).emit('user-connected', userId)

    socket.on('disconnect', () => {
      socket.to(roomId).emit('user-disconnected', userId)
      const index = connectedClients[roomId].indexOf(socket.id)
      if (index !== -1) {
        connectedClients[roomId].splice(index, 1)
        if(connectedClients[roomId].length == 0){
          delete connectedClients[roomId]
        }
      }
    })
  })
})

server.listen(4230)

process.on('SIGTERM', () => {
  console.info("Interrupted");
  process.exit(0);
})