api-server/src/common/throttle/redis-throttler.storage.ts

import { Injectable } from '@nestjs/common';
import { ThrottlerStorage } from '@nestjs/throttler';
import { ThrottlerStorageRecord } from '@nestjs/throttler/dist/throttler-storage-record.interface';
import { RedisService } from '../../infrastructure/redis/redis.service';

@Injectable()
export class RedisThrottlerStorage implements ThrottlerStorage {
  constructor(private readonly redis: RedisService) {}

  async increment(key: string, ttl: number, limit: number, blockDuration: number, throttlerName: string): Promise<ThrottlerStorageRecord> {
    const redisKey = `throttle:${throttlerName}:${key}`;
    try {
      const hits = await this.redis.incr(redisKey);
      await this.redis.expire(redisKey, Math.ceil(ttl / 1000));
      const isBlocked = hits > limit;
      const timeToBlockExpire = isBlocked ? blockDuration : 0;
      return { totalHits: hits, timeToExpire: ttl, isBlocked, timeToBlockExpire };
    } catch {
      return { totalHits: 1, timeToExpire: ttl, isBlocked: false, timeToBlockExpire: 0 };
    }
  }
}