implement transport.pipe

common/buf/writer.go

@@ -142,6 +142,14 @@ func (w *BufferedWriter) ReadFrom(reader io.Reader) (int64, error) {
 	return sc.Size, err
 }
 
+// Close implements io.Closable.
+func (w *BufferedWriter) Close() error {
+	if err := w.Flush(); err != nil {
+		return err
+	}
+	return common.Close(w.writer)
+}
+
 type seqWriter struct {
 	writer io.Writer
 }