@vtex/diagnostics-nodejs/dist/metrics/gauge.js

Diagnostics library for Node.js applications

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Gauge = void 0;
exports.NewGauge = NewGauge;
const options_1 = require("./options");
class Gauge {
    constructor(gauge) {
        this.lastValues = new Map();
        this.gauge = gauge;
    }
    add(value, attributes, context) {
        this.gauge.add(value, this.convertAttributes(attributes), context);
        this.updateLastValue(value, attributes, true);
    }
    subtract(value, attributes, context) {
        this.gauge.add(-value, this.convertAttributes(attributes), context);
        this.updateLastValue(-value, attributes, true);
    }
    set(value, attributes, context) {
        const attrKey = this.getAttributesKey(attributes || {});
        const lastValue = this.lastValues.get(attrKey) || 0;
        const delta = value - lastValue;
        this.gauge.add(delta, this.convertAttributes(attributes), context);
        this.lastValues.set(attrKey, value);
    }
    updateLastValue(value, attributes, isIncrement = false) {
        const attrKey = this.getAttributesKey(attributes || {});
        const currentValue = this.lastValues.get(attrKey) || 0;
        const newValue = isIncrement ? currentValue + value : value;
        this.lastValues.set(attrKey, newValue);
    }
    getAttributesKey(attributes) {
        return JSON.stringify(attributes);
    }
    convertAttributes(attrs) {
        if (!attrs)
            return undefined;
        const result = {};
        for (const [key, value] of Object.entries(attrs)) {
            if (value !== undefined && value !== null) {
                result[key] = value;
            }
        }
        return result;
    }
}
exports.Gauge = Gauge;
function NewGauge(meter, name, opts = []) {
    const config = (0, options_1.newConfig)(opts);
    const gauge = meter.createUpDownCounter(name, {
        description: config.description,
        unit: config.unit,
    });
    return new Gauge(gauge);
}
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