outline/server/utils/MutexLock.ts

import Redlock from "redlock";
import Redis from "@server/storage/redis";

export class MutexLock {
  // Default expiry time for acquiring lock in milliseconds
  public static defaultLockTimeout = 4000;

  /**
   * Returns the redlock instance
   */
  public static get lock(): Redlock {
    this.redlock ??= new Redlock([Redis.defaultClient], {
      retryJitter: 10,
      retryCount: 20,
      retryDelay: 200,
    });

    return this.redlock;
  }

  private static redlock: Redlock;
}