hyperliquid-sdk/src/utils/rateLimiter.ts

<<< Typescript SDK for the Hyperliquid API >>>

export class RateLimiter {
  private tokens: number;
  private lastRefill: number;
  private readonly capacity: number;

  constructor() {
    this.capacity = 1200; // 1200 tokens per minute
    this.tokens = this.capacity;
    this.lastRefill = Date.now();
  }

  private refillTokens() {
    const now = Date.now();
    const elapsedMinutes = (now - this.lastRefill) / (1000 * 60); // convert to minutes
    if (elapsedMinutes >= 1) {
      this.tokens = this.capacity;
      this.lastRefill = now;
    }
  }

  async waitForToken(weight: number = 1): Promise<void> {
    this.refillTokens();
    if (this.tokens >= weight) {
      this.tokens -= weight;
      return;
    }

    const waitTime = (60 - (Date.now() - this.lastRefill) / 1000) * 1000; // wait until next refill
    return new Promise((resolve) => setTimeout(resolve, waitTime)).then(() => {
      this.refillTokens();
      return this.waitForToken(weight); // recursively check again after refill
    });
  }
}