Uploading file to storage asynchronously.

server/dao/file.go

@@ -3,6 +3,7 @@ package dao
 import (
 	"errors"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 	"nysoure/server/model"
 	"time"
 )
@@ -35,15 +36,22 @@ func GetUploadingFile(id uint) (*model.UploadingFile, error) {
 }
 
 func UpdateUploadingBlock(id uint, blockIndex int) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		// 使用 FOR UPDATE 锁获取记录
 		uf := &model.UploadingFile{}
-	if err := db.Where("id = ?", id).First(uf).Error; err != nil {
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("id = ?", id).First(uf).Error; err != nil {
 			return err
 		}
+
 		if blockIndex < 0 || blockIndex >= uf.BlocksCount() {
 			return nil
 		}
+
 		uf.Blocks[blockIndex] = true
-	return db.Save(uf).Error
+
+		// 在事务中立即保存更改
+		return tx.Save(uf).Error
+	})
 }
 
 func DeleteUploadingFile(id uint) error {
@@ -135,3 +143,18 @@ func UpdateFile(id uint, filename string, description string) (*model.File, erro
 	}
 	return f, nil
 }
+
+func SetFileStorageKey(id uint, storageKey string) error {
+	f := &model.File{}
+	if err := db.Where("id = ?", id).First(f).Error; err != nil {
+		return err
+	}
+	f.StorageKey = storageKey
+	if err := db.Save(f).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return model.NewNotFoundError("file not found")
+		}
+		return err
+	}
+	return nil
+}

server/service/file.go

@@ -179,21 +179,19 @@ func FinishUploadingFile(uid uint, fid uint) (*model.FileView, error) {
 		return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 	}
 
-	defer func() {
-		_ = os.Remove(resultFilePath)
-	}()
-
 	for i := 0; i < uploadingFile.BlocksCount(); i++ {
 		blockPath := filepath.Join(uploadingFile.TempPath, strconv.Itoa(i))
 		data, err := os.ReadFile(blockPath)
 		if err != nil {
 			log.Error("failed to read block file: ", err)
 			_ = file.Close()
+			_ = os.Remove(resultFilePath)
 			return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 		}
 		if _, err := file.Write(data); err != nil {
 			log.Error("failed to write result file: ", err)
 			_ = file.Close()
+			_ = os.Remove(resultFilePath)
 			return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 		}
 	}
@@ -205,28 +203,41 @@ func FinishUploadingFile(uid uint, fid uint) (*model.FileView, error) {
 	s, err := dao.GetStorage(uploadingFile.TargetStorageID)
 	if err != nil {
 		log.Error("failed to get storage: ", err)
+		_ = os.Remove(resultFilePath)
 		return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 	}
 
 	iStorage := storage.NewStorage(s)
 	if iStorage == nil {
 		log.Error("failed to find storage: ", err)
+		_ = os.Remove(resultFilePath)
 		return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 	}
 
-	storageKey, err := iStorage.Upload(resultFilePath)
+	dbFile, err := dao.CreateFile(uploadingFile.Filename, uploadingFile.Description, uploadingFile.TargetResourceID, &uploadingFile.TargetStorageID, "", "")
-	if err != nil {
-		log.Error("failed to upload file: ", err)
-		return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
-	}
-
-	dbFile, err := dao.CreateFile(uploadingFile.Filename, uploadingFile.Description, uploadingFile.TargetResourceID, &uploadingFile.TargetStorageID, storageKey, "")
 	if err != nil {
 		log.Error("failed to create file in db: ", err)
-		_ = iStorage.Delete(storageKey)
+		_ = os.Remove(resultFilePath)
 		return nil, model.NewInternalServerError("failed to finish uploading file. please re-upload")
 	}
 
+	go func() {
+		defer func() {
+			_ = os.Remove(resultFilePath)
+		}()
+		storageKey, err := iStorage.Upload(resultFilePath)
+		if err != nil {
+			log.Error("failed to upload file to storage: ", err)
+		} else {
+			err = dao.SetFileStorageKey(dbFile.ID, storageKey)
+			if err != nil {
+				_ = iStorage.Delete(storageKey)
+				_ = dao.DeleteFile(dbFile.ID)
+				log.Error("failed to set file storage key: ", err)
+			}
+		}
+	}()
+
 	return dbFile.ToView(), nil
 }
 
@@ -367,6 +378,10 @@ func DownloadFile(fid uint) (string, string, error) {
 		return "", "", model.NewInternalServerError("failed to find storage")
 	}
 
+	if file.StorageKey == "" {
+		return "", "", model.NewRequestError("file is not available, please try again later")
+	}
+
 	path, err := iStorage.Download(file.StorageKey)
 
 	return path, file.Filename, err