From 5fd655251b614cd6b936a3301f79d1f8df1a28ab Mon Sep 17 00:00:00 2001
From: Spongecaptain <wjjiang19@163.com>
Date: Sat, 5 Mar 2022 12:06:31 +0800
Subject: [PATCH] performance opt: using copy instead of append

---
 memlog.go | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/memlog.go b/memlog.go
index 15a728b..62f1fd1 100644
--- a/memlog.go
+++ b/memlog.go
@@ -44,8 +44,8 @@ func (r Record) deepCopy() Record {
 	if r.Metadata.Offset == 0 && r.Metadata.Created.IsZero() {
 		return Record{}
 	}
-
-	dCopy := append([]byte(nil), r.Data...)
+	dCopy := make([]byte, len(r.Data))
+	copy(dCopy, r.Data)
 	return Record{
 		Metadata: Header{
 			Offset:  r.Metadata.Offset,
@@ -139,13 +139,14 @@ func (l *Log) write(ctx context.Context, data []byte) (Offset, error) {
 		return -1, errors.New("no data provided")
 	}
 
-	dcopy := append([]byte(nil), data...)
+	dCopy := make([]byte, len(data))
+	copy(dCopy, data)
 	r := Record{
 		Metadata: Header{
 			Offset:  l.offset,
 			Created: l.clock.Now().UTC(),
 		},
-		Data: dcopy,
+		Data: dCopy,
 	}
 
 	err := l.active.write(ctx, r)