feat: allow keep files in offline download (close #4678)

internal/offline_download/tool/add.go

@@ -16,6 +16,7 @@ const (
 	DeleteOnUploadSucceed DeletePolicy = "delete_on_upload_succeed"
 	DeleteOnUploadFailed  DeletePolicy = "delete_on_upload_failed"
 	DeleteNever           DeletePolicy = "delete_never"
+	DeleteAlways          DeletePolicy = "delete_always"
 )
 
 type AddURLArgs struct {

internal/offline_download/tool/download.go

@@ -125,10 +125,11 @@ func (t *DownloadTask) Complete() error {
 	for i, _ := range files {
 		file := files[i]
 		TransferTaskManager.Add(&TransferTask{
-			file:       file,
-			dstDirPath: t.DstDirPath,
-			wg:         &wg,
-			tempDir:    t.TempDir,
+			file:         file,
+			dstDirPath:   t.DstDirPath,
+			wg:           &wg,
+			tempDir:      t.TempDir,
+			deletePolicy: t.DeletePolicy,
 		})
 	}
 	return nil

internal/offline_download/tool/transfer.go

@@ -9,16 +9,18 @@ import (
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
 	"github.com/xhofe/tache"
+	"os"
 	"path/filepath"
 	"sync"
 )
 
 type TransferTask struct {
 	tache.Base
-	file       File
-	dstDirPath string
-	wg         *sync.WaitGroup
-	tempDir    string
+	file         File
+	dstDirPath   string
+	wg           *sync.WaitGroup
+	tempDir      string
+	deletePolicy DeletePolicy
 }
 
 func (t *TransferTask) Run() error {
@@ -61,6 +63,24 @@ func (t *TransferTask) GetStatus() string {
 	return "transferring"
 }
 
+func (t *TransferTask) OnSucceeded() {
+	if t.deletePolicy == DeleteOnUploadSucceed || t.deletePolicy == DeleteAlways {
+		err := os.Remove(t.file.Path)
+		if err != nil {
+			log.Errorf("failed to delete file %s, error: %s", t.file.Path, err.Error())
+		}
+	}
+}
+
+func (t *TransferTask) OnFailed() {
+	if t.deletePolicy == DeleteOnUploadFailed || t.deletePolicy == DeleteAlways {
+		err := os.Remove(t.file.Path)
+		if err != nil {
+			log.Errorf("failed to delete file %s, error: %s", t.file.Path, err.Error())
+		}
+	}
+}
+
 var (
 	TransferTaskManager *tache.Manager[*TransferTask]
 )