matrix-js-sdk/src/webrtc/stats/transportStatsBuilder.ts

Matrix Client-Server SDK for Javascript

import { TransportStats } from "./transportStats";

export class TransportStatsBuilder {
    public static buildReport(
        report: RTCStatsReport | undefined,
        now: RTCIceCandidatePairStats,
        conferenceStatsTransport: TransportStats[],
        isFocus: boolean,
    ): TransportStats[] {
        const localUsedCandidate = report?.get(now.localCandidateId);
        const remoteUsedCandidate = report?.get(now.remoteCandidateId);

        // RTCIceCandidateStats
        // https://w3c.github.io/webrtc-stats/#icecandidate-dict*
        if (remoteUsedCandidate && localUsedCandidate) {
            const remoteIpAddress =
                remoteUsedCandidate.ip !== undefined ? remoteUsedCandidate.ip : remoteUsedCandidate.address;
            const remotePort = remoteUsedCandidate.port;
            const ip = `${remoteIpAddress}:${remotePort}`;

            const localIpAddress =
                localUsedCandidate.ip !== undefined ? localUsedCandidate.ip : localUsedCandidate.address;
            const localPort = localUsedCandidate.port;
            const localIp = `${localIpAddress}:${localPort}`;

            const type = remoteUsedCandidate.protocol;

            // Save the address unless it has been saved already.
            if (
                !conferenceStatsTransport.some(
                    (t: TransportStats) => t.ip === ip && t.type === type && t.localIp === localIp,
                )
            ) {
                conferenceStatsTransport.push({
                    ip,
                    type,
                    localIp,
                    isFocus,
                    localCandidateType: localUsedCandidate.candidateType,
                    remoteCandidateType: remoteUsedCandidate.candidateType,
                    networkType: localUsedCandidate.networkType,
                    rtt: now.currentRoundTripTime ? now.currentRoundTripTime * 1000 : NaN,
                } as TransportStats);
            }
        }
        return conferenceStatsTransport;
    }
}