Use bytes.Buffer pools for wrappers

wrappers/buffer_pool.go

@@ -0,0 +1,27 @@
+package wrappers
+
+import (
+	"bytes"
+	"sync"
+)
+
+var bufPool sync.Pool
+
+func getBuffer() *bytes.Buffer {
+	buf := bufPool.Get().(*bytes.Buffer)
+	buf.Reset()
+
+	return buf
+}
+
+func putBuffer(buf *bytes.Buffer) {
+	bufPool.Put(buf)
+}
+
+func init() {
+	bufPool = sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+}