feat: rewrite bus to prevent deadlocks

pkg/storage/driver/rpc/server/blob/new_blob_reader.go

@@ -45,12 +45,12 @@ func (s *Service) NewBlobReader(ctx context.Context, args *NewBlobReaderArgs, re
 func (s *Service) getOpenedReader(id ReaderID) (io.ReadSeekCloser, error) {
 	raw, exists := s.readers.Load(id)
 	if !exists {
-		return nil, errors.Errorf("could not find writer '%s'", id)
+		return nil, errors.Errorf("could not find reader '%s'", id)
 	}
 
 	reader, ok := raw.(io.ReadSeekCloser)
 	if !ok {
-		return nil, errors.Errorf("unexpected type '%T' for writer", raw)
+		return nil, errors.Errorf("unexpected type '%T' for reader", raw)
 	}
 
 	return reader, nil