feat: better cache some stuff

lib/cache/cache.ts

@@ -104,3 +104,27 @@ export async function set<T extends RedisValue>(
   }
   return res;
 }
+
+export const cacheFunction = async <T extends (() => Promise<unknown>)>(
+  {
+    fn,
+    id,
+    options = {},
+  }: {
+    fn: T;
+    id: string;
+    options?: RedisOptions;
+  },
+): Promise<Awaited<ReturnType<T>>> => {
+  const cacheResult = await get(id) as string;
+
+  if (cacheResult) {
+    return JSON.parse(cacheResult) as Awaited<ReturnType<typeof fn>>;
+  }
+
+  const result = await fn();
+
+  set(id, JSON.stringify(result), options);
+
+  return result as Awaited<ReturnType<typeof fn>>;
+};