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export class SlidingWindowRateLimiter {
constructor(private readonly redis: RedisClient, private readonly windowMs = 60000) {}
async isAllowed(key: string, limit = 60): Promise<boolean> {
const now = Date.now();
const clearBefore = now - this.windowMs;
const multi = this.redis.multi();
multi.zremrangebyscore(key, 0, clearBefore);
multi.zadd(key, now, `${now}:${Math.random()}`);
multi.zcard(key);
multi.expire(key, Math.ceil(this.windowMs / 1000));
const results = await multi.exec();
const count = results[2][1] as number;
return count <= limit;
}
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