count = 10000
size = 100  // megabytes

hosts = ['host1', 'host2', 'host3', 'host4', 'host5']
facilities = ['Server', 'Client', 'Proxy']
chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz         '.split('');

speed = 1500.0;  // messages per second
start = new Date().getTime() - 24*60*60*1000;

function random(elements) {
    return elements[Math.floor(Math.random() * elements.length)];
}

function message() {
    var str = '';
    for (var i=0; i < 100; i++) {
        str += random(chars);
    };
    return str;
}


db.messages.drop()
db.createCollection('messages', {capped: true, size: size * 1024 * 1024})


for (var i = 0; i < count; i++) {
    hash = {};
    hash.created_at = (start + i / speed * 1000.0) / 1000.0;
    hash.host = random(hosts);
    hash.facility = random(facilities);
    hash.level = random([1,2,3,4,5,6]);
    hash.message = message();

    db.messages.save(hash);
}

db.messages.find().sort({$natural: 1}).limit(1).forEach(function(x) { printjson(x); })
db.messages.find().sort({$natural: -1}).limit(1).forEach(function(x) { printjson(x); })