Error Handling in Async Code

class CircuitBreaker {
  constructor(operation, failureThreshold = 5, resetTimeout = 60000) {
    this.operation = operation;
    this.failureThreshold = failureThreshold;
    this.resetTimeout = resetTimeout;
    this.failures = 0;
    this.lastFailureTime = null;
    this.state = 'CLOSED';
  }

  async execute(...args) {
    if (this.state === 'OPEN') {
      if (Date.now() - this.lastFailureTime >= this.resetTimeout) {
        this.state = 'HALF_OPEN';
      } else {
        throw new Error('Circuit breaker is OPEN');
      }
    }

    try {
      const result = await this.operation(...args);
      this.reset();
      return result;
    } catch (error) {
      this.failures++;
      this.lastFailureTime = Date.now();
      
      if (this.failures >= this.failureThreshold) {
        this.state = 'OPEN';
      }
      throw error;
    }
  }

  reset() {
    this.failures = 0;
    this.state = 'CLOSED';
  }
}