quic/dist/internal/congestion.js

A QUIC server/client implementation in Node.js.

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
// **Github:** https://github.com/fidm/quic
//
// **License:** MIT
const initialRTTus = 1000; // microsecond
const rttAlpha = 0.25;
const oneMinusAlpha = 1 - rttAlpha;
class RTTStats {
    constructor() {
        this.minRTT = 0;
        this.latestRTT = initialRTTus;
        this.smoothedRTT = initialRTTus;
    }
    get msRTT() {
        return Math.floor(this.smoothedRTT / 1000);
    }
    // TODO: it is a simple version
    updateRTT(sentTime, rcvTime, ackDelay) {
        if (sentTime <= 0 || rcvTime <= sentTime) {
            return;
        }
        const sendDelta = (rcvTime - sentTime) * 1000 - ackDelay;
        if (sendDelta <= 0) {
            return;
        }
        let sample = sendDelta;
        if (sample > 2 * this.latestRTT) {
            sample = Math.ceil(0.618 * sample);
        }
        this.latestRTT = sample;
        if (this.minRTT > sample || this.minRTT === 0) {
            this.minRTT = sample;
        }
        this.smoothedRTT = Math.ceil(this.smoothedRTT * oneMinusAlpha + sample * rttAlpha);
    }
}
exports.RTTStats = RTTStats;
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