Implement metrics

metrics/metrics.js

@@ -0,0 +1,39 @@
+const { CircularBuffer } = require("./circularBuffer");
+
+class Metric {
+	constructor(barName, multibar, bufferSize) {
+		this.multibar = multibar;
+		this.pbar = multibar.create(0, 0);
+		this.pbar.update(0, { name: barName });
+		this.buffer = new CircularBuffer(bufferSize);
+		this.maxRate = 0;
+		setInterval(this.UpdateBar.bind(this), 100);
+	}
+
+	AddEvent() {
+		const timestamp = Date.now();
+		this.buffer.push({ timestamp, count: 1 });
+	}
+
+	GetRate() {
+		const entries = this.buffer.toArray();
+		const currentTime = Date.now();
+
+		const interval = entries.length > 1 ? currentTime - entries[0].timestamp : 1;
+
+		const totalRX = entries.reduce((sum, entry) => sum + entry.count, 0);
+		return Math.round((totalRX / interval) * 100000) / 100;
+	}
+
+	UpdateBar() {
+		const eps = this.GetRate();
+		if (eps > this.maxRate) {
+			this.pbar.total = eps;
+			this.maxRate = eps;
+		}
+		this.pbar.update(eps);
+		this.multibar.update();
+	}
+}
+
+module.exports = { Metric };