refactor code for diff reuse

cmd/download.go

@@ -16,19 +16,21 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var (
-	downloadArgs struct {
-		file   string
-		folder string
+type downloadArgument struct {
+	file   string
+	folder string
 
-		indexer string
-		nodes   []string
+	indexer string
+	nodes   []string
 
-		root  string
-		proof bool
+	root  string
+	proof bool
 
-		timeout time.Duration
-	}
+	timeout time.Duration
+}
+
+var (
+	downloadArgs downloadArgument
 
 	downloadCmd = &cobra.Command{
 		Use:   "download",
@@ -39,8 +41,9 @@ var (
 
 func init() {
 	downloadCmd.Flags().StringVar(&downloadArgs.file, "file", "", "File name to download")
-	downloadCmd.Flags().StringVar(&downloadArgs.file, "folder", "", "Folder name to download")
+	downloadCmd.Flags().StringVar(&downloadArgs.folder, "folder", "", "Folder name to download")
 	downloadCmd.MarkFlagsOneRequired("file", "folder")
+	downloadCmd.MarkFlagsMutuallyExclusive("file", "folder")
 
 	downloadCmd.Flags().StringSliceVar(&downloadArgs.nodes, "node", []string{}, "ZeroGStorage storage node URL. Multiple nodes could be specified and separated by comma, e.g. url1,url2,url3")
 	downloadCmd.Flags().StringVar(&downloadArgs.indexer, "indexer", "", "ZeroGStorage indexer URL")
@@ -63,7 +66,7 @@ func download(*cobra.Command, []string) {
 		defer cancel()
 	}
 
-	downloader, closer, err := newDownloader()
+	downloader, closer, err := newDownloader(downloadArgs)
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to initialize downloader")
 	}
@@ -89,7 +92,7 @@ func downloadFolder(ctx context.Context, downloader iDownloader) error {
 		return errors.WithMessage(err, "failed to create folder")
 	}
 
-	root, err := buildZgFileTree(ctx, downloader)
+	root, err := buildZgFileTree(ctx, downloader, downloadArgs.root, downloadArgs.proof)
 	if err != nil {
 		return errors.WithMessage(err, "failed to build file free from ZeroGStorage network")
 	}
@@ -121,13 +124,14 @@ func downloadFolder(ctx context.Context, downloader iDownloader) error {
 }
 
 // buildZgFileTree downloads directory metadata from the ZeroGStorage network, and then decodes it to a file tree.
-func buildZgFileTree(ctx context.Context, downloader iDownloader) (*dir.FsNode, error) {
+func buildZgFileTree(ctx context.Context, downloader iDownloader, root string, proof bool) (*dir.FsNode, error) {
 	// Download the directory metadata file to a temporary location.
-	dirMetaFilePath := filepath.Join(os.TempDir(), "0g."+downloadArgs.root+".metadata")
-	err := downloader.Download(ctx, downloadArgs.root, dirMetaFilePath, downloadArgs.proof)
+	dirMetaFilePath := filepath.Join(os.TempDir(), "0gdir-"+root+".metadata")
+	err := downloader.Download(ctx, root, dirMetaFilePath, proof)
 	if err != nil && !errors.Is(err, transfer.ErrFileAlreadyExists) {
 		return nil, errors.WithMessage(err, "failed to download directory metadata")
 	}
+	defer os.Remove(dirMetaFilePath)
 
 	// Read the downloaded metadata file.
 	metaData, err := os.ReadFile(dirMetaFilePath)
@@ -149,7 +153,7 @@ type iDownloader interface {
 	Download(ctx context.Context, root string, filename string, withProof bool) error
 }
 
-func newDownloader() (iDownloader, func(), error) {
+func newDownloader(downloadArgs downloadArgument) (iDownloader, func(), error) {
 	if downloadArgs.indexer != "" {
 		indexerClient, err := indexer.NewClient(downloadArgs.indexer, indexer.IndexerClientOption{
 			ProviderOption: providerOption,