Method LocalFileExport

engine/engineutil/filesync.go:136–220

(
	ctx context.Context,
	srcPath string,
	filePath string,
	destPath string,
	allowParentDirPath bool,
)

}

func (c *Client) LocalFileExport(
	ctx context.Context,
	srcPath string,
	filePath string,
	destPath string,
	allowParentDirPath bool,
) (rerr error) {
	ctx = slog.WithLogger(ctx, slog.FromContext(ctx).With(
		"export_path", destPath,
		"file_path", filePath,
		"allow_parent_dir_path", allowParentDirPath,
	))
	slog.DebugContext(ctx, "exporting local file")
	defer func() {
		slog.TraceContext(ctx, "finished exporting local file", "err", rerr)
	}()

	ctx, cancel, err := c.withClientCloseCancel(ctx)
	if err != nil {
		return err
	}
	defer cancel(errors.New("local file export done"))

	destPath = path.Clean(destPath)

	file, err := os.Open(srcPath)
	if err != nil {
		return fmt.Errorf("failed to open file: %w", err)
	}
	defer file.Close()
	stat, err := file.Stat()
	if err != nil {
		return fmt.Errorf("failed to stat file: %w", err)
	}

	ctx = engine.LocalExportOpts{
		Path:               destPath,
		IsFileStream:       true,
		FileOriginalName:   filepath.Base(filePath),
		AllowParentDirPath: allowParentDirPath,
		FileMode:           stat.Mode().Perm(),
	}.AppendToOutgoingContext(ctx)

	clientCaller, err := c.GetSessionCaller(ctx)
	if err != nil {
		return fmt.Errorf("failed to get requester session: %w", err)
	}
	diffCopyClient, err := filesync.NewFileSendClient(clientCaller.Conn()).DiffCopy(ctx)
	if err != nil {
		return fmt.Errorf("failed to create diff copy client: %w", err)
	}
	defer diffCopyClient.CloseSend()

	fileSizeLeft := stat.Size()
	chunkSize := int64(MaxFileContentsChunkSize)
	for fileSizeLeft > 0 {
		buf := new(bytes.Buffer) // TODO: more efficient to use bufio.Writer, reuse buffers, sync.Pool, etc.
		n, err := io.CopyN(buf, file, chunkSize)