simplemetrics.js

// Simple metrics gathering
export default class SimpleMetrics  {

    constructor () {
        this.mainStartTime = +(new Date());
        this.startTimings = {};
        this.reportedTimings = [];
    }

    startTiming () {
        this.mainStartTime = +(new Date());
    };
    
    startMetric (name) {
        console.log(`LOG: Starting ${name}`);
        this.startTimings[name] = +(new Date()) - this.mainStartTime;
    };
    
    endMetric (name) {
        console.log(`LOG: Ending ${name}`);
        const endTime = +(new Date());
        this.reportedTimings.push({
            name,
            endTime: endTime - this.mainStartTime,
            startTime: this.startTimings[name],
            duration: (endTime - this.mainStartTime) - this.startTimings[name],
        });
    };
    
    printMetrics () {
        console.log(JSON.stringify(this.reportedTimings));
        this.reportedTimings = [];
        this.startTimings = {};
    };

}