Node.js listen to session variable change and trigger server-sent event

Question

I am writing a webapp, using express.js.

My webapp achieves the following

1. User posts 100 json objects
2. Each json object is processed via a service

Answer 1

I came up with a solution please let me know if this is the right way to do stuff ?

Will this solution work across sessions ?

Server side Code

var events = require('events');
var progressEmitter = new events.EventEmitter();

exports.cleanseMatch = function(req, res)
{
    console.log('cleanseMatch Inovked');
    var progressTrigger = new events.EventEmitter;
    var id = '';
    var i = 1;  

     id = setInterval(function(){
        req.session.percentage = (i/10)*100;
        i++;
        console.log('PCT is: ' + req.session.percentage);
        progressEmitter.emit('progress',req.session.percentage)

        if(i == 11) {
        req.session.percentage = 100;
        clearInterval(id);              
        res.json({'data':'test'});
        }
    },1000);
}

exports.progress = function(req,res)
{
    console.log('progress Inovked');
    // console.log('PCT is: ' + req.session.percentage);

    res.writeHead(200, {'Content-Type': 'text/event-stream'});
    progressEmitter.on('progress',function(percentage){
         console.log('progress event fired for : ' + percentage);
         res.write("event: progress\n");
         res.write("data: "+percentage+"\n\n");
    });
}

Client Side Code

var source = new EventSource('progress');
source.addEventListener('progress', function(e) {
    var percentage = JSON.parse(e.data);
    //update progress bar in client
    App.updateProgressBar(percentage);
}, false);