socket.handler.js

module.exports = (socket, io) => {
  socket.on('join', (id) => {
    const roomClients = io.sockets.adapter.rooms[id] || { length: 0 };

    if (roomClients.length > 1) socket.emit('full_room', id);
    else {
      socket.join(id);
      socket.emit('join', id);
    }
  })


  socket.on('offer', event => {
    socket.broadcast.to(event.id).emit('offer', event.offer)
  });
  socket.on('answer', event => {
    socket.broadcast.to(event.id).emit('answer', event.answer)
  });

  socket.on('end', event => {
    io.to(event.id).emit('end');

    io.in(event.id).clients(function (error, ids) {
      ids.forEach(id => {
        io.sockets.sockets[id].leave(event.id);
      })
    })
  });

  socket.on('candidate', event => {
    socket.broadcast.to(event.id).emit('candidate', event)
  })
}