gistfile1.txt

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    var numFormatter = window.Intl !== undefined
        ? new Intl.NumberFormat('en', { maximumFractionDigits: 0 })
        : { format: function (number) { return number.toFixed(0).toString().replace(/(.)(?=(\d{3})+$)/g, '$1,') } }
    ;
    var updatesPerSecond = 2;
    var secondsElapsedSinceStatsWereUpdated = getCurrentTimeStamp() - stats['updatedAt'];
    var downloads = stats['total']['downloads'] + secondsElapsedSinceStatsWereUpdated * stats['total']['perSecond'];
    window.setInterval(function(){ updateStats() }, 1000 / updatesPerSecond);

    // update the stats interpolating the historic data to simulate real-time
    function updateStats() {
        downloads += (stats['total']['perSecond'] / updatesPerSecond);
        document.getElementById('total').innerHTML = numFormatter.format(downloads);
    }

    // This avoids displaying different stats when the local computer clock is not in sync
    function getCurrentTimeStamp()
    {
        var request = new XMLHttpRequest();
        request.open('GET', '/500million/timestamp', false); // false = sync request
        request.setRequestHeader('Content-Type', 'application/json');
        request.send();

        if (request.status === 200) {
            var response = JSON.parse(request.responseText);
            return response['now'];
        } else {
            return (Date.now() / 1000);
        }
    }