redis cache

www/app/lib/redisClient.ts

@@ -0,0 +1,46 @@
+import Redis from "ioredis";
+import { isBuildPhase } from "./next";
+
+export type RedisClient = Pick<Redis, "get" | "setex" | "del">;
+
+const getRedisClient = (): RedisClient => {
+  const redisUrl = process.env.KV_URL;
+  if (!redisUrl) {
+    throw new Error("KV_URL environment variable is required");
+  }
+  const redis = new Redis(redisUrl, {
+    maxRetriesPerRequest: 3,
+    lazyConnect: true,
+  });
+
+  redis.on("error", (error) => {
+    console.error("Redis error:", error);
+  });
+
+  // not necessary but will indicate redis config errors by failfast at startup
+  // happens only once; after that connection is allowed to die and the lib is assumed to be able to restore it eventually
+  redis.connect().catch((e) => {
+    console.error("Failed to connect to Redis:", e);
+    process.exit(1);
+  });
+
+  return redis;
+};
+
+// next.js buildtime usage - we want to isolate next.js "build" time concepts here
+const noopClient: RedisClient = (() => {
+  const noopSetex: Redis["setex"] = async () => {
+    return "OK" as const;
+  };
+  const noopDel: Redis["del"] = async () => {
+    return 0;
+  };
+  return {
+    get: async () => {
+      return null;
+    },
+    setex: noopSetex,
+    del: noopDel,
+  };
+})();
+export const tokenCacheRedis = isBuildPhase ? noopClient : getRedisClient();