perf(server): cache speed limit calculations

internal/logic/server/getServerUserListLogic.go

@@ -137,7 +137,7 @@ func (l *GetServerUserListLogic) GetServerUserList(req *types.GetServerUserListR
 			return nil, err
 		}
 	}
-	
+
 	if len(subs) == 0 {
 		return &types.GetServerUserListResponse{
 			Users: []types.ServerUser{
@@ -194,7 +194,7 @@ func (l *GetServerUserListLogic) GetServerUserList(req *types.GetServerUserListR
 	val, _ := json.Marshal(resp)
 	etag := tool.GenerateETag(val)
 	l.ctx.Header("ETag", etag)
-	err = l.svcCtx.Redis.Set(l.ctx, cacheKey, string(val), -1).Err()
+	err = l.svcCtx.Redis.Set(l.ctx, cacheKey, string(val), l.serverUserListCacheTTL()).Err()
 	if err != nil {
 		l.Errorw("[ServerUserListCacheKey] redis set error", logger.Field("error", err.Error()))
 	}
@@ -205,6 +205,18 @@ func (l *GetServerUserListLogic) GetServerUserList(req *types.GetServerUserListR
 	return resp, nil
 }
 
+func (l *GetServerUserListLogic) serverUserListCacheTTL() time.Duration {
+	pullInterval := l.svcCtx.Config.Node.NodePullInterval
+	if pullInterval <= 0 {
+		pullInterval = 60
+	}
+	ttl := time.Duration(pullInterval*2) * time.Second
+	if ttl < time.Minute {
+		return time.Minute
+	}
+	return ttl
+}
+
 func (l *GetServerUserListLogic) shouldIncludeServerUser(userSub *user.Subscribe, serverNodeGroupIds []int64) bool {
 	if userSub == nil {
 		return false
@@ -295,6 +307,15 @@ func (l *GetServerUserListLogic) canUseExpiredNodeGroup(userSub *user.Subscribe,
 
 // calculateEffectiveSpeedLimit 计算用户的实际限速值（考虑按量限速规则）
 func (l *GetServerUserListLogic) calculateEffectiveSpeedLimit(sub *subscribe.Subscribe, userSub *user.Subscribe) int64 {
-	result := speedlimit.Calculate(l.ctx.Request.Context(), l.svcCtx.DB, userSub.UserId, userSub.Id, sub.SpeedLimit, sub.TrafficLimit)
+	result := speedlimit.CalculateWithCache(
+		l.ctx.Request.Context(),
+		l.svcCtx.Redis,
+		l.svcCtx.DB,
+		userSub.UserId,
+		userSub.Id,
+		sub.SpeedLimit,
+		sub.TrafficLimit,
+		30*time.Second,
+	)
 	return result.EffectiveSpeed
 }