quiz_tftb/socketsrv.js

const io = require( "socket.io" )();
const socketsrv = {
    io: io
};
let usersCount = 0;

// Add your socket.io logic here!
io.on( "connection", function( socket ) {
    usersCount++;
    io.emit('users_update', { users: usersCount });
    console.log( "User connected. All users: "+usersCount, action: 'added' );

    socket.on('push', () => {
        usersCount--;
        io.emit('users_update', { users: usersCount, action: 'removed' });
        console.log( `User connected. Users left: ${usersCount}` );
    });

    socket.on('disconnect', () => {
        usersCount--;
        io.emit('users_update', { users: usersCount, action: 'removed' });
        console.log( `User connected. Users left: ${usersCount}` );
    });

});
// end of socket.io logic

module.exports = socketsrv;