bug fixes

common/buf/writer.go

@@ -9,11 +9,6 @@ type BufferToBytesWriter struct {
 
 // Write implements Writer.Write(). Write() takes ownership of the given buffer.
 func (w *BufferToBytesWriter) Write(mb MultiBuffer) error {
-	if mw, ok := w.writer.(MultiBufferWriter); ok {
-		_, err := mw.WriteMultiBuffer(mb)
-		return err
-	}
-
 	defer mb.Release()
 
 	bs := mb.ToNetBuffers()
@@ -21,6 +16,15 @@ func (w *BufferToBytesWriter) Write(mb MultiBuffer) error {
 	return err
 }
 
+type writerAdapter struct {
+	writer MultiBufferWriter
+}
+
+func (w *writerAdapter) Write(mb MultiBuffer) error {
+	_, err := w.writer.WriteMultiBuffer(mb)
+	return err
+}
+
 type bytesToBufferWriter struct {
 	writer Writer
 }