feat(backend): implement GetStat function to retrieve file statistics and storage limits

backend/internal/controllers/stat.go

@@ -0,0 +1,50 @@
+package controllers
+
+import (
+	"backend/internal/models"
+	"backend/internal/utils"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+	"github.com/spf13/cast"
+)
+
+func GetStat(c echo.Context) error {
+	keys, err := models.GetRedisFileKeysAll()
+	if err != nil {
+		return utils.HTTPErrorHandler(c, err)
+	}
+	var filesSize int64
+	for _, key := range keys {
+		list := strings.Split(key, "_")
+		if len(list) > 1 {
+			filesSize += cast.ToInt64(list[1])
+		}
+	}
+	queueInspector := utils.GetQueueInspector()
+	queues, err := queueInspector.History("default", 30)
+	if err != nil {
+		return utils.HTTPErrorHandler(c, err)
+	}
+
+	maxStorageSize, err := utils.GetFileSize(utils.GetEnv("MAX_LOCALSTORAGE_SIZE"))
+	if err != nil {
+		return utils.HTTPErrorHandler(c, err)
+	}
+
+	return utils.HTTPSuccessHandler(c, map[string]any{
+		"version": "0.1.0",
+		"total": map[string]any{
+			"file_size": filesSize,
+			"file_num":  len(keys),
+		},
+		"limit": map[string]any{
+			"file_size": maxStorageSize,
+		},
+		"admin": map[string]any{
+			"user_name": utils.GetEnv("ADMIN_NAME"),
+			"email":     utils.GetEnv("ADMIN_EMAIL"),
+		},
+		"queue": queues,
+	})
+}