move the redundant writeline writeBytesLine to proxy/util/util.go

pkg/proxy/util/utils.go

@@ -17,6 +17,7 @@ limitations under the License.
 package util
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -441,3 +442,22 @@ func GetClusterIPByFamily(ipFamily v1.IPFamily, service *v1.Service) string {
 
 	return ""
 }
+
+// WriteLine join all words with spaces, terminate with newline and write to buff.
+func WriteLine(buf *bytes.Buffer, words ...string) {
+	// We avoid strings.Join for performance reasons.
+	for i := range words {
+		buf.WriteString(words[i])
+		if i < len(words)-1 {
+			buf.WriteByte(' ')
+		} else {
+			buf.WriteByte('\n')
+		}
+	}
+}
+
+// WriteBytesLine write bytes to buffer, terminate with newline
+func WriteBytesLine(buf *bytes.Buffer, bytes []byte) {
+	buf.Write(bytes)
+	buf.WriteByte('\n')
+}