Change hostname function name and hid variable.

Made the LocalHost variable private and changed it's name to
localhost.

Added additional funciton SetLocalHostname to set the hostname to
register as.

Change getter methods name to match setter. Change it to
LocalHostname().

Author: gdey

replication/binlogsyncer.go

@@ -26,8 +26,7 @@ type BinlogSyncer struct {
 	c        *client.Conn
 	serverID uint32
 
-	// LocalHost is the name of you want to present to the MySQL master. If it is not set it will default to os.Hostname()
-	LocalHost string
+	localhost string
 	host      string
 	port      uint16
 	user      string
@@ -65,13 +64,19 @@ func NewBinlogSyncer(serverID uint32, flavor string) *BinlogSyncer {
 	return b
 }
 
-func (b *BinlogSyncer) localhostName() string {
+// LocalHostname returns the hostname that register slave would register as.
+func (b *BinlogSyncer) LocalHostname() string {
 
-	if b.LocalHost == "" {
+	if b.localhost == "" {
 		h, _ := os.Hostname()
 		return h
 	}
-	return b.LocalHost
+	return b.localhost
+}
+
+// SetLocalHostname set's the hostname that register salve would register as.
+func (b *NewBinlogSyncer) SetLocalHostname(name string) {
+	b.localhost = name
 }
 
 func (b *BinlogSyncer) Close() {
@@ -412,7 +417,7 @@ func (b *BinlogSyncer) writeBinlogDumpMariadbGTIDCommand(gset GTIDSet) error {
 func (b *BinlogSyncer) writeRegisterSlaveCommand() error {
 	b.c.ResetSequence()
 
-	hostname := b.localhostName()
+	hostname := b.LocalHostname()
 
 	// This should be the name of slave host not the host we are connecting to.
 	data := make([]byte, 4+1+4+1+len(hostname)+1+len(b.user)+1+len(b.password)+2+4+4)