feat: add redis (#242)

* feat: add refis

* feat: add redis package

Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

* feat: add example docker compose, add redis connection in package

* fix: usage of client after subscribe

* feat: add logger for redis

* refactor: format files

Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

---------

Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

packages/redis/src/index.ts

@@ -0,0 +1,39 @@
+import { Redis } from "ioredis";
+import superjson from "superjson";
+
+import { logger } from "@homarr/log";
+
+const subscriber = new Redis();
+const publisher = new Redis();
+const lastDataClient = new Redis();
+
+const createChannel = <TData>(name: string) => {
+  return {
+    subscribe: (callback: (data: TData) => void) => {
+      void lastDataClient.get(`last-${name}`).then((data) => {
+        if (data) {
+          callback(superjson.parse(data));
+        }
+      });
+      void subscriber.subscribe(name, (err) => {
+        if (!err) {
+          return;
+        }
+        logger.error(
+          `Error with channel '${name}': ${err.name} (${err.message})`,
+        );
+      });
+      subscriber.on("message", (channel, message) => {
+        if (channel !== name) return;
+
+        callback(superjson.parse(message));
+      });
+    },
+    publish: async (data: TData) => {
+      await lastDataClient.set(`last-${name}`, superjson.stringify(data));
+      await publisher.publish(name, superjson.stringify(data));
+    },
+  };
+};
+
+export const exampleChannel = createChannel<{ message: string }>("example");