move beatsaver map caching to redis

src/db/redis.ts

@@ -0,0 +1,31 @@
+import { createClient } from "redis";
+
+let redisClient = connectRedis();
+
+async function connectRedis() {
+  console.log("Connecting to redis");
+  const client = createClient({
+    url: process.env.REDIS_URL,
+  });
+  await client.connect();
+
+  client.on("connect", () => {
+    console.log("Connected to redis");
+  });
+
+  client.on("error", (error) => {
+    console.error("There was an error connecting to redis: " + error);
+    setTimeout(() => {
+      redisClient = connectRedis();
+    }, 5_000); // 5 seconds
+  });
+
+  return client;
+}
+
+// todo: add disconnect handler
+
+export const Redis = {
+  client: redisClient,
+  connectRedis,
+};