overleaf/services/document-updater/app/coffee/Profiler.js

/*
 * decaffeinate suggestions:
 * DS206: Consider reworking classes to avoid initClass
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let Profiler;
const Settings = require('settings-sharelatex');
const logger = require('logger-sharelatex');

const deltaMs = function(ta, tb) {
	const nanoSeconds = ((ta[0]-tb[0])*1e9) + (ta[1]-tb[1]);
	const milliSeconds = Math.floor(nanoSeconds*1e-6);
	return milliSeconds;
};

module.exports = (Profiler = (function() {
	Profiler = class Profiler {
		static initClass() {
			this.prototype.LOG_CUTOFF_TIME = 1000;
		}

		constructor(name, args) {
			this.name = name;
			this.args = args;
			this.t0 = (this.t = process.hrtime());
			this.start = new Date();
			this.updateTimes = [];
		}

		log(label) {
			const t1 = process.hrtime();
			const dtMilliSec = deltaMs(t1, this.t);
			this.t = t1;
			this.updateTimes.push([label, dtMilliSec]); // timings in ms
			return this; // make it chainable
		}

		end(message) {
			const totalTime = deltaMs(this.t, this.t0);
			if (totalTime > this.LOG_CUTOFF_TIME) { // log anything greater than cutoff
				const args = {};
				for (let k in this.args) {
					const v = this.args[k];
					args[k] = v;
				}
				args.updateTimes = this.updateTimes;
				args.start = this.start;
				args.end = new Date();
				logger.log(args, this.name);
			}
			return totalTime;
		}
	};
	Profiler.initClass();
	return Profiler;
})());