var Prometheus = require('prometheus-client');
var client = new Prometheus();

function measureShare(postDetail){
    var numberOfShare = client.newGauge({
        namespace: "psu_project",
        name: "share_count",
        help: "number of share"
    });

    setInterval(function(){
        postDetail.aggregate(
            [
                {
                    $group:
                    {
                        _id:"like_count",
                        count: {
                            $sum: "$SHARE"
                        }
                    }
                }
            ]).toArray(function(err, docs){
                if(err){
                    process.exit(0);
                }

                var count = docs[0].count;

                numberOfShare.set({
                    period: "10sec"
                }, count);
            });
        }, 10000);
}

measureShare(mongodb.collection("post_detail"));

client.listen(9095);