Poor man's in-memory exclusive lock mechanism for Javascript

poboy.js

/*
 * Uses 100ms intervals to check for released lock - super simple
 * @author Me and ChatGPT
 */

class PoboyLock {
  constructor() {
    this.lockedKeys = new Set();
  }

  async getLock(key) {
    return new Promise((resolve, reject) => {
      const startTime = Date.now();
      const timeoutDuration = 30000; // 30 seconds

      const checkLock = () => {
        if (!this.lockedKeys.has(key)) {
          this.lockedKeys.add(key);
          resolve(key);
        } else {
          const elapsedTime = Date.now() - startTime;
          if (elapsedTime < timeoutDuration) {
            setTimeout(checkLock, 100);
          } else {
            reject(new Error("Failed to obtain lock within the timeout period."));
          }
        }
      };

      checkLock();
    });
  }

  releaseLock(key) {
    if (this.lockedKeys.has(key)) {
      this.lockedKeys.delete(key);
      console.log(`Lock released for key: ${key}`);
    } else {
      console.warn(`Trying to release a lock that is not held for key: ${key}`);
    }
  }
}

// Example usage:
const poboyLock = new PoboyLock();

async function exampleUsage() {
  try {
    const key = await poboyLock.getLock("myKey");
    // Do something with the lock
    console.log(`Working with lock for key: ${key}`);
    // Release the lock when done
    poboyLock.releaseLock(key);
  } catch (error) {
    console.error(error.message);
  }
}

exampleUsage();