show ramdom background image

server/middleware/frontend_middleware.go

@@ -157,9 +157,11 @@ func serveIndexHtml(c fiber.Ctx) error {
 		}
 	} else if path == "/" || path == "" {
 		pinned, err := service.GetPinnedResources()
-		if err == nil {
+		random, err1 := service.RandomCover()
+		if err == nil && err1 == nil {
 			preFetchDataJson, _ := json.Marshal(map[string]interface{}{
-				"pinned": pinned,
+				"pinned":     pinned,
+				"background": random,
 			})
 			preFetchData = url.PathEscape(string(preFetchDataJson))
 		}

server/service/resource.go

@@ -288,6 +288,22 @@ func RandomResource(host string) (*model.ResourceDetailView, error) {
 	return &v, nil
 }
 
+var lastSuccessCover uint
+
+func RandomCover() (uint, error) {
+	for retries := 0; retries < 5; retries++ {
+		v, err := dao.RandomResource()
+		if err != nil {
+			return 0, err
+		}
+		if len(v.Images) > 0 {
+			lastSuccessCover = v.Images[0].ID
+			return v.Images[0].ID, nil
+		}
+	}
+	return lastSuccessCover, nil
+}
+
 func GetPinnedResources() ([]model.ResourceView, error) {
 	ids := config.PinnedResources()
 	var views []model.ResourceView