Initial Commit

packages/api/src/services/redis.ts

@@ -0,0 +1,27 @@
+import Redis from 'ioredis';
+import {REDIS_URL} from '../app/constants';
+
+export const redis = new Redis(REDIS_URL);
+
+export const REDIS_ONE_MINUTE = 60;
+export const REDIS_DEFAULT_EXPIRY = REDIS_ONE_MINUTE / 60;
+
+/**
+ * @param key The key for redis (use Keys#<type>)
+ * @param fn The function to return a resource. Can be a promise
+ * @param seconds The amount of seconds to hold this resource in redis for. Defaults to 60
+ */
+export async function wrapRedis<T>(key: string, fn: () => Promise<T>, seconds = REDIS_DEFAULT_EXPIRY): Promise<T> {
+  const cached = await redis.get(key);
+  if (cached) {
+    return JSON.parse(cached);
+  }
+
+  const recent = await fn();
+
+  if (recent) {
+    await redis.set(key, JSON.stringify(recent), 'EX', seconds);
+  }
+
+  return recent;
+}