KSP-MissionControl/packages/db/src/redis.ts

/**
 * Redis connection wrapper. Provides one client for normal commands
 * and a separate one for pub/sub (Redis requires dedicated connections
 * for subscribe mode).
 */
import Redis from 'ioredis';

export interface RedisPair {
  /** For GET/SET/PUBLISH etc. */
  client: Redis;
  /** For SUBSCRIBE only — must not be used for other commands. */
  subscriber: Redis;
  close(): Promise<void>;
}

export function createRedis(url: string): RedisPair {
  const client = new Redis(url, {
    lazyConnect: false,
    maxRetriesPerRequest: 3,
    enableReadyCheck: true,
  });
  const subscriber = new Redis(url, {
    lazyConnect: false,
    maxRetriesPerRequest: null, // subscribers reconnect forever
  });
  return {
    client,
    subscriber,
    async close() {
      await Promise.all([client.quit().catch(() => {}), subscriber.quit().catch(() => {})]);
    },
  };
}