fix(user): don't invalidate user cache when user is connecting to spectator-server

resolve the sixth of #90

app/service/subscribers/user_cache.py

@@ -0,0 +1,22 @@
+from app.dependencies.database import get_redis
+from app.log import logger
+from app.service.user_cache_service import get_user_cache_service
+
+from .base import RedisSubscriber
+
+KEY = "user:online_status"
+
+
+class UserOnlineSubscriber(RedisSubscriber):
+    async def start_subscribe(self):
+        await self.subscribe(KEY)
+        self.add_handler(KEY, self.on)
+        self.start()
+
+    async def on(self, c: str, s: str):  # noqa: ARG002
+        user_id = int(s)
+        logger.info(f"Received user online status update for user_id: {s}")
+        await get_user_cache_service(get_redis()).invalidate_user_cache(user_id)
+
+
+user_online_subscriber = UserOnlineSubscriber()