KM Koushik
51 lines
1.1 KiB
TypeScript
51 lines
1.1 KiB
TypeScript
import IORedis from "ioredis";
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import { env } from "~/env";
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export let connection: IORedis | null = null;
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export const getRedis = () => {
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if (!connection) {
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connection = new IORedis(`${env.REDIS_URL}?family=0`, {
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maxRetriesPerRequest: null,
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});
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}
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return connection;
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};
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/**
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* Simple Redis caching helper. Stores JSON-serialized values under `key` for `ttlSeconds`.
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* If the key exists, returns the parsed value; otherwise, runs `fetcher`, caches, and returns it.
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*/
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export async function withCache<T>(
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key: string,
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fetcher: () => Promise<T>,
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options?: { ttlSeconds?: number; disable?: boolean }
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): Promise<T> {
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const { ttlSeconds = 120, disable = false } = options ?? {};
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const redis = getRedis();
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if (!disable) {
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const cached = await redis.get(key);
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if (cached) {
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try {
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return JSON.parse(cached) as T;
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} catch {
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// fallthrough to refresh cache
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}
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}
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}
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const value = await fetcher();
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if (!disable) {
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try {
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await redis.setex(key, ttlSeconds, JSON.stringify(value));
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} catch {
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// ignore cache set errors
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}
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}
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return value;
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}
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