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const segmentDuration = 10.0; // seconds per segment
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const latencyThreshold = 180; // notify the viewer once they cross this threshold
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const segmentThreshold = latencyThreshold / segmentDuration;
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let token, streamTitle, viewerCount, streamStatus, streamLight, refreshButton
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// ensure only one heartbeat is sent at a time
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let heartIsBeating = false;
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// https://github.com/30-seconds/30-seconds-of-code/blob/master/snippets/parseCookie.md
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const parseCookie = str =>
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str
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.split(';')
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.map(v => v.split('='))
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.reduce((acc, v) => {
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acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
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return acc;
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}, {});
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let streamInfoFrame = window.frames['stream-info'];
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streamInfoFrame.addEventListener("load", function() {
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console.log("stream info iframe loaded");
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const streamInfo = streamInfoFrame.contentDocument
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streamTitle = streamInfo.getElementById("stream-title");
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viewerCount = streamInfo.getElementById("viewer-count");
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streamStatus = streamInfo.getElementById("stream-status");
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streamLight = streamInfo.getElementById("stream-light");
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refreshButton = streamInfo.getElementById("refresh-button");
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refreshButton.onclick = function() { return window.location.reload(true); };
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// this viewer's token
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token = parseCookie(document.cookie).token;
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// get stream info every 20 seconds
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setInterval(heartbeat, 20000);
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});
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function currentSegment() {
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try {
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const tracks = videojs.players.vjs_video_3.textTracks();
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const cues = tracks[0].cues;
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const uri = cues[cues.length - 1].value.uri;
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return parseInt(uri.split("/")[3].slice(6));
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} catch ( error ) {
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return null;
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}
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}
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function updateStreamStatus(msg, color, showRefreshButton) {
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streamStatus.innerHTML = msg;
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streamLight.style.color = color;
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if ( showRefreshButton ) {
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refreshButton.style.display = "";
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} else {
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refreshButton.style.display = "none";
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}
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}
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// get stream info from the server (viewer count, current segment, if stream is online)
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function heartbeat() {
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if ( heartIsBeating ) {
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return;
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} else {
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heartIsBeating = true;
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}
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// prepare a request to /heartbeat
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const xhr = new XMLHttpRequest();
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xhr.open("GET", "/heartbeat");
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xhr.timeout = 18000; // timeout in ms, 18 seconds
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xhr.onerror = function(e) {
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heartIsBeating = false;
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console.log(e);
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updateStreamStatus("The stream was unreachable. Try refreshing the page.", "yellow", true);
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}
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xhr.ontimeout = xhr.onerror;
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xhr.onload = function(e) {
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heartIsBeating = false;
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if ( xhr.status != 200 ) {
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return xhr.onerror(xhr);
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}
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response = JSON.parse(xhr.responseText)
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// update viewer count
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viewerCount.innerHTML = response.viewers;
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// update stream title
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streamTitle.innerHTML = response.title;
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// update stream status
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if ( !response.online ) {
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return updateStreamStatus("The stream has ended.", "red", false);
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}
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const serverSegment = response.current_segment;
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if ( !Number.isInteger(serverSegment) ) {
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return updateStreamStatus("The stream has ended.", "red", false);
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}
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// when the page is first loaded clientSegment may be null
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const clientSegment = currentSegment();
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if ( Number.isInteger(clientSegment) ) {
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const diff = serverSegment - clientSegment;
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if ( diff >= segmentThreshold ) {
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return updateStreamStatus(`You're more than ${latencyThreshold} seconds behind the stream. Refresh the page.`, "yellow", true);
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} else if ( diff < 0 ) {
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return updateStreamStatus("The stream restarted. Refresh the page.", "yellow", true);
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}
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}
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// otherwise
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return updateStreamStatus("The stream is online.", "green", false);
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}
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xhr.send();
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}
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