identify the type name in decode and encode of signed snapshots

protocol/protocol.go

@@ -61,7 +61,7 @@ func (b *SignedSnapshot) Encode() ([]byte, error) {
 	var buf bytes.Buffer
 	encoder := codec.NewEncoder(&buf, &codec.MsgpackHandle{})
 	if err := encoder.Encode(b); err != nil {
-		log.Errorf("Failed to encode message: %v", err)
+		log.Errorf("Failed to encode signed snapshot into message: %v", err)
 		return nil, err
 	}
 	return buf.Bytes(), nil
@@ -71,7 +71,7 @@ func (b *SignedSnapshot) Decode(msg []byte) error {
 	reader := bytes.NewReader(msg)
 	decoder := codec.NewDecoder(reader, &codec.MsgpackHandle{})
 	if err := decoder.Decode(b); err != nil {
-		log.Errorf("Failed to decode snapshots batch: %v", err)
+		log.Errorf("Failed to decode signed snapshot: %v", err)
 		return err
 	}
 	return nil