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chore(clerk-js): Add random jitter for session cookie pooler interval #6066

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chore(clerk-js): Add random jitter for session cookie pooler interval #6066

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13 changes: 11 additions & 2 deletions packages/clerk-js/src/core/auth/SessionCookiePoller.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,16 @@ import { createWorkerTimers } from '@clerk/shared/workerTimers';
import { SafeLock } from './safeLock';

const REFRESH_SESSION_TOKEN_LOCK_KEY = 'clerk.lock.refreshSessionToken';
const INTERVAL_IN_MS = 5 * 1_000;

/**
* Returns an interval in milliseconds with random jitter.
* Uses a base interval of 5 seconds and adds up to 1.5 seconds of random jitter.
* This randomization helps prevent synchronized polling requests across multiple clients.
*/
const getIntervalInMs = () => {
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Just saw that we have to take SYNC_LEEWAY in consideration as well.

const jitter = Math.random() * 1500;
return 5 * 1_000 + jitter;
};

export class SessionCookiePoller {
private lock = SafeLock(REFRESH_SESSION_TOKEN_LOCK_KEY);
Expand All @@ -20,7 +29,7 @@ export class SessionCookiePoller {
const run = async () => {
this.initiated = true;
await this.lock.acquireLockAndRun(cb);
this.timerId = this.workerTimers.setTimeout(run, INTERVAL_IN_MS);
this.timerId = this.workerTimers.setTimeout(run, getIntervalInMs());
};

void run();
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