Count stuff within a time interval e.g. how many users logged in the last hour?
npm install sliding-window-counter
var counter = require('sliding-window-counter');
var cnt = counter(10000); // Track events the last 10s
cnt(5); // add 5 events
setInterval(function() {
cnt(1); // add 1 event
}, 2000);
setInterval(function() {
console.log(cnt(), 'events during the last 10s');
}, 1000);It is possible to serialize a counter, and reload the data later on.
var counter = require('sliding-window-counter');
var cnt = counter(10000);
// ... have the counter run for a while
var oldData = cnt.toJSON();
var newCnt = counter(oldData);
// ...MIT