make redis optional

src/lib/kv.ts

@@ -1,10 +1,15 @@
 import { FrameNotificationDetails } from "@farcaster/frame-sdk";
 import { Redis } from "@upstash/redis";
 
-const redis = new Redis({
-  url: process.env.KV_REST_API_URL,
-  token: process.env.KV_REST_API_TOKEN,
-});
+// In-memory fallback storage
+const localStore = new Map<string, FrameNotificationDetails>();
+
+// Use Redis if KV env vars are present, otherwise use in-memory
+const useRedis = process.env.KV_REST_API_URL && process.env.KV_REST_API_TOKEN;
+const redis = useRedis ? new Redis({
+  url: process.env.KV_REST_API_URL!,
+  token: process.env.KV_REST_API_TOKEN!,
+}) : null;
 
 function getUserNotificationDetailsKey(fid: number): string {
   return `${process.env.NEXT_PUBLIC_FRAME_NAME}:user:${fid}`;
@@ -13,20 +18,32 @@ function getUserNotificationDetailsKey(fid: number): string {
 export async function getUserNotificationDetails(
   fid: number
 ): Promise<FrameNotificationDetails | null> {
-  return await redis.get<FrameNotificationDetails>(
-    getUserNotificationDetailsKey(fid)
-  );
+  const key = getUserNotificationDetailsKey(fid);
+  if (redis) {
+    return await redis.get<FrameNotificationDetails>(key);
+  }
+  return localStore.get(key) || null;
 }
 
 export async function setUserNotificationDetails(
   fid: number,
   notificationDetails: FrameNotificationDetails
 ): Promise<void> {
-  await redis.set(getUserNotificationDetailsKey(fid), notificationDetails);
+  const key = getUserNotificationDetailsKey(fid);
+  if (redis) {
+    await redis.set(key, notificationDetails);
+  } else {
+    localStore.set(key, notificationDetails);
+  }
 }
 
 export async function deleteUserNotificationDetails(
   fid: number
 ): Promise<void> {
-  await redis.del(getUserNotificationDetailsKey(fid));
+  const key = getUserNotificationDetailsKey(fid);
+  if (redis) {
+    await redis.del(key);
+  } else {
+    localStore.delete(key);
+  }
 }