优化结构

internal/biz/system/media.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/google/uuid"
@@ -46,6 +47,8 @@ type MediaUsecase struct {
 	settings RuntimeSettings
 }
 
+var mediaDeleteMu sync.Mutex
+
 var ErrMediaTooLarge = errors.New("文件超过大小上限")
 
 func NewMediaUsecase(repo MediaRepo, files FileStorage, settings RuntimeSettings) *MediaUsecase {
@@ -119,6 +122,8 @@ func (uc *MediaUsecase) Upload(ctx context.Context, userID uint, name, suppliedM
 }
 
 func (uc *MediaUsecase) Delete(ctx context.Context, id uint) error {
+	mediaDeleteMu.Lock()
+	defer mediaDeleteMu.Unlock()
 	media, err := uc.FindMedia(ctx, id)
 	if err != nil {
 		return err