Add a limit to the leaderboard size

board-server/src/leaderboard.rs

@@ -4,6 +4,7 @@ use std::env;
 use std::sync::Arc;
 
 const LEADERBOARD: &str = "leaderboard";
+const LEADERBOARD_SIZE: isize = 10;
 type LeaderboardEntry = (String, u32);
 
 #[async_trait]
@@ -37,7 +38,7 @@ impl Leaderboard for RedisLeaderboard {
         let mut con = self.client.get_async_connection().await?;
         let count: isize = con.zcard(LEADERBOARD).await?;
         let leaderboard: Vec<LeaderboardEntry> =
-            con.zrange_withscores(LEADERBOARD, 0, count - 1).await?;
+            con.zrange_withscores(LEADERBOARD, 0, (count - 1).min(LEADERBOARD_SIZE)).await?;
         Ok(leaderboard)
     }