72 lines
5.2 KiB
JavaScript
72 lines
5.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const os = require("os");
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const INIT_INTERVAL = 50;
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const MEASURE_INTERVAL = 200;
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// timespan of which to measure load
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// must be a multiple of MEASURE_INTERVAL
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const MEASURE_TIMESPAN = 5000;
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const loadListSize = MEASURE_TIMESPAN / MEASURE_INTERVAL;
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class SystemMonitor {
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constructor() {
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this.cpuUsage = 0;
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this.memoryUsage = 0;
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this.loads = [];
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this.interval = null;
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}
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// After init is called there is at least something in the cpuUsage thingy
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init() {
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this.calcLoad();
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return new Promise((resolve) => {
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setTimeout(() => {
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this.calcLoad();
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this.interval = setInterval(() => this.calcLoad(), MEASURE_INTERVAL);
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resolve();
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}, INIT_INTERVAL);
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});
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}
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close() {
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clearInterval(this.interval);
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}
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calcLoad() {
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let totalIdle = 0;
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let totalTick = 0;
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const cpus = os.cpus();
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if (!cpus) {
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// In some environments, os.cpus() might return undefined (although it's not stated in
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// the Node.js docs), see #113 for more information
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return;
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}
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for (let i = 0, len = cpus.length; i < len; i += 1) {
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const cpu = cpus[i];
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for (const type in cpu.times) {
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totalTick += cpu.times[type];
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}
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totalIdle += cpu.times.idle;
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}
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const currentLoad = {
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idle: totalIdle / cpus.length,
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total: totalTick / cpus.length,
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};
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if (this.loads.length !== 0) {
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const compareLoad = this.loads[0];
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const idleDifference = currentLoad.idle - compareLoad.idle;
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const totalDifference = currentLoad.total - compareLoad.total;
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this.cpuUsage = 100 - (100 * idleDifference / totalDifference);
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this.memoryUsage = 100 - (100 * os.freemem() / os.totalmem());
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}
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this.loads.push(currentLoad);
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if (this.loads.length > loadListSize) {
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// remove oldest entry
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this.loads.shift();
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}
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}
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getCpuUsage() {
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return this.cpuUsage;
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}
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getMemoryUsage() {
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return this.memoryUsage;
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}
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}
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exports.default = SystemMonitor;
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