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refactor: Add exponential backoff #6

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Merged
SzymonMakula merged 2 commits into from
Jan 25, 2026
Merged

refactor: Add exponential backoff #6

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7079271
refactor: change how reconnect logic is handled
SzymonMakula Jan 24, 2026
263e8b5
refactor: use show modal, fix callback
SzymonMakula Jan 24, 2026
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161 changes: 84 additions & 77 deletions public/room.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,96 +4,103 @@ const pageID = location.pathname.split('/')[2];
const errorDialog = document.getElementById('error-dialog');
const loader = document.querySelector('.loader');

let retries = 0;

function connectSSE() {
const sse = new EventSource(`/events/room?id=${pageID}`);
const sse = new EventSource(`/events/room?id=${pageID}`);

sse.onmessage = (event) => {
const data = JSON.parse(event.data);
sse.onmessage = (event) => {
const data = JSON.parse(event.data);

switch (data.event) {
case 'room_update': {
viewerCounter.textContent = data.payload.viewer_count;
break;
}
default: {
break;
}
}
};
switch (data.event) {
case 'room_update': {
viewerCounter.textContent = data.payload.viewer_count;
break;
}
default: {
break;
}
}
};
}


let timeout = 0;
const BASE_TIMEOUT = 1000;
const MAX_TIMEOUT = 16000;

const startWhepEventKey = "startwhep"
const reconnectWhepEventKey = "reconnectwhep"

const target = new EventTarget();
target.addEventListener("startwhep", (event) => {
startWhep().catch(() => {
target.dispatchEvent(new Event(reconnectWhepEventKey))
});
})
target.addEventListener(reconnectWhepEventKey, (event) => {
if (timeout < MAX_TIMEOUT) {
setTimeout(() => startWhep().catch(() => {
target.dispatchEvent(new Event(reconnectWhepEventKey))
}), timeout)
// First reconnect should have no timeout
timeout = Math.max(BASE_TIMEOUT, timeout * 2);
} else {
// Reconnection failed
errorDialog.showModal()
}
})

async function startWhep() {
const conn = new RTCPeerConnection();
const conn = new RTCPeerConnection();

conn.addTransceiver('audio', { direction: 'recvonly' });
conn.addTransceiver('video', { direction: 'recvonly' });
conn.ontrack = ({ streams }) => {
video.srcObject = streams[0];
};
conn.addTransceiver('audio', {direction: 'recvonly'});
conn.addTransceiver('video', {direction: 'recvonly'});
conn.ontrack = ({streams}) => {
video.srcObject = streams[0];
};

conn.addEventListener('connectionstatechange', () => {
retries++;
switch (conn.connectionState) {
case 'closed': {
if (retries < 5) {
startWhep().then(() => {
video.play();
});
} else {
console.warn('closed');
}
break;
}
case 'disconnected': {
if (retries < 5) {
startWhep().then(() => {
video.play();
});
} else {
console.warn('disconnected');
conn.addEventListener('connectionstatechange', () => {
switch (conn.connectionState) {
case 'closed': {
target.dispatchEvent(new Event(reconnectWhepEventKey))
console.warn('closed');
break;
}
case 'disconnected': {
target.dispatchEvent(new Event(reconnectWhepEventKey))
console.warn('disconnected');
break;
}
case 'failed': {
target.dispatchEvent(new Event(reconnectWhepEventKey))
console.warn('failed');
break;
}
case 'connecting': {
loader.classList.toggle('hidden');
break;
}
case 'connected': {
timeout = 0;
loader.classList.toggle('hidden');
break;
}
}
break;
}
case 'failed': {
if (retries < 5) {
startWhep().then(() => {
video.play();
});
} else {
console.warn('failed');
}
break;
}
case 'connecting': {
loader.classList.toggle('hidden');
break;
}
case 'connected': {
loader.classList.toggle('hidden');
retries = 0;
break;
}
}
});
});

const sdp_offer = await conn.createOffer();
await conn.setLocalDescription(sdp_offer);
const sdp_offer = await conn.createOffer();
await conn.setLocalDescription(sdp_offer);

const sdp_answer = await fetch(`/whep?target_id=${pageID}`, {
method: 'POST',
headers: {
'content-type': 'application/sdp',
},
body: sdp_offer.sdp,
}).then((res) => res.text());
const sdp_answer = await fetch(`/whep?target_id=${pageID}`, {
method: 'POST',
headers: {
'content-type': 'application/sdp',
},
body: sdp_offer.sdp,
}).then((res) => res.text());

await conn.setRemoteDescription({ sdp: sdp_answer, type: 'answer' });
await conn.setRemoteDescription({sdp: sdp_answer, type: 'answer'});
}

connectSSE();
startWhep().catch((err) => {
console.error('RTC setup error: ', err);
errorDialog.showModal();
});
target.dispatchEvent(startWhepEventKey)
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