46 lines
762 B
JavaScript
46 lines
762 B
JavaScript
'use strict';
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const counters = {};
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const listeners = [];
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function increment(name, amount) {
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amount = amount || 1;
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counters[name] = (counters[name] || 0) + amount;
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for (const listener of listeners) {
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listener(name, counters[name]);
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}
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}
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function get(name) {
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return counters[name] || 0;
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}
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function snapshot() {
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return Object.assign({}, counters);
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}
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function reset() {
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for (const key of Object.keys(counters)) {
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counters[key] = 0;
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}
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}
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function onUpdate(fn) {
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listeners.push(fn);
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}
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function startPeriodicLog(intervalMs) {
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return setInterval(() => {
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console.log('[metrics]', JSON.stringify(snapshot()));
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}, intervalMs || 30000);
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}
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module.exports = {
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increment,
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get,
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snapshot,
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reset,
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onUpdate,
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startPeriodicLog,
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};
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