Merge pull request #960 from 0xObjc/codex/user-spending-ranking

feat(admin): add user spending ranking dashboard view

backend/internal/handler/admin/dashboard_handler.go

@@ -466,9 +466,60 @@ type BatchUsersUsageRequest struct {
 	UserIDs []int64 `json:"user_ids" binding:"required"`
 }
 
+var dashboardUsersRankingCache = newSnapshotCache(5 * time.Minute)
 var dashboardBatchUsersUsageCache = newSnapshotCache(30 * time.Second)
 var dashboardBatchAPIKeysUsageCache = newSnapshotCache(30 * time.Second)
 
+func parseRankingLimit(raw string) int {
+	limit, err := strconv.Atoi(strings.TrimSpace(raw))
+	if err != nil || limit <= 0 {
+		return 12
+	}
+	if limit > 50 {
+		return 50
+	}
+	return limit
+}
+
+// GetUserSpendingRanking handles getting user spending ranking data.
+// GET /api/v1/admin/dashboard/users-ranking
+func (h *DashboardHandler) GetUserSpendingRanking(c *gin.Context) {
+	startTime, endTime := parseTimeRange(c)
+	limit := parseRankingLimit(c.DefaultQuery("limit", "12"))
+
+	keyRaw, _ := json.Marshal(struct {
+		Start string `json:"start"`
+		End   string `json:"end"`
+		Limit int    `json:"limit"`
+	}{
+		Start: startTime.UTC().Format(time.RFC3339),
+		End:   endTime.UTC().Format(time.RFC3339),
+		Limit: limit,
+	})
+	cacheKey := string(keyRaw)
+	if cached, ok := dashboardUsersRankingCache.Get(cacheKey); ok {
+		c.Header("X-Snapshot-Cache", "hit")
+		response.Success(c, cached.Payload)
+		return
+	}
+
+	ranking, err := h.dashboardService.GetUserSpendingRanking(c.Request.Context(), startTime, endTime, limit)
+	if err != nil {
+		response.Error(c, 500, "Failed to get user spending ranking")
+		return
+	}
+
+	payload := gin.H{
+		"ranking":           ranking.Ranking,
+		"total_actual_cost": ranking.TotalActualCost,
+		"start_date":        startTime.Format("2006-01-02"),
+		"end_date":          endTime.Add(-24 * time.Hour).Format("2006-01-02"),
+	}
+	dashboardUsersRankingCache.Set(cacheKey, payload)
+	c.Header("X-Snapshot-Cache", "miss")
+	response.Success(c, payload)
+}
+
 // GetBatchUsersUsage handles getting usage stats for multiple users
 // POST /api/v1/admin/dashboard/users-usage
 func (h *DashboardHandler) GetBatchUsersUsage(c *gin.Context) {

backend/internal/handler/admin/dashboard_handler_request_type_test.go

@@ -19,6 +19,9 @@ type dashboardUsageRepoCapture struct {
 	trendStream      *bool
 	modelRequestType *int16
 	modelStream      *bool
+	rankingLimit     int
+	ranking          []usagestats.UserSpendingRankingItem
+	rankingTotal     float64
 }
 
 func (s *dashboardUsageRepoCapture) GetUsageTrendWithFilters(
@@ -49,6 +52,18 @@ func (s *dashboardUsageRepoCapture) GetModelStatsWithFilters(
 	return []usagestats.ModelStat{}, nil
 }
 
+func (s *dashboardUsageRepoCapture) GetUserSpendingRanking(
+	ctx context.Context,
+	startTime, endTime time.Time,
+	limit int,
+) (*usagestats.UserSpendingRankingResponse, error) {
+	s.rankingLimit = limit
+	return &usagestats.UserSpendingRankingResponse{
+		Ranking:         s.ranking,
+		TotalActualCost: s.rankingTotal,
+	}, nil
+}
+
 func newDashboardRequestTypeTestRouter(repo *dashboardUsageRepoCapture) *gin.Engine {
 	gin.SetMode(gin.TestMode)
 	dashboardSvc := service.NewDashboardService(repo, nil, nil, nil)
@@ -56,6 +71,7 @@ func newDashboardRequestTypeTestRouter(repo *dashboardUsageRepoCapture) *gin.Eng
 	router := gin.New()
 	router.GET("/admin/dashboard/trend", handler.GetUsageTrend)
 	router.GET("/admin/dashboard/models", handler.GetModelStats)
+	router.GET("/admin/dashboard/users-ranking", handler.GetUserSpendingRanking)
 	return router
 }
 
@@ -130,3 +146,30 @@ func TestDashboardModelStatsInvalidStream(t *testing.T) {
 
 	require.Equal(t, http.StatusBadRequest, rec.Code)
 }
+
+func TestDashboardUsersRankingLimitAndCache(t *testing.T) {
+	dashboardUsersRankingCache = newSnapshotCache(5 * time.Minute)
+	repo := &dashboardUsageRepoCapture{
+		ranking: []usagestats.UserSpendingRankingItem{
+			{UserID: 7, Email: "rank@example.com", ActualCost: 10.5, Requests: 3, Tokens: 300},
+		},
+		rankingTotal: 88.8,
+	}
+	router := newDashboardRequestTypeTestRouter(repo)
+
+	req := httptest.NewRequest(http.MethodGet, "/admin/dashboard/users-ranking?limit=100&start_date=2025-01-01&end_date=2025-01-02", nil)
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+	require.Equal(t, 50, repo.rankingLimit)
+	require.Contains(t, rec.Body.String(), "\"total_actual_cost\":88.8")
+	require.Equal(t, "miss", rec.Header().Get("X-Snapshot-Cache"))
+
+	req2 := httptest.NewRequest(http.MethodGet, "/admin/dashboard/users-ranking?limit=100&start_date=2025-01-01&end_date=2025-01-02", nil)
+	rec2 := httptest.NewRecorder()
+	router.ServeHTTP(rec2, req2)
+
+	require.Equal(t, http.StatusOK, rec2.Code)
+	require.Equal(t, "hit", rec2.Header().Get("X-Snapshot-Cache"))
+}