fix hardward addr bug

logs/es/es.go

@@ -80,7 +80,7 @@ func (el *esLogger) WriteMsg(when time.Time, msg string, level int, lable string
 	vals["hostname"] = GetHostname()
 	vals["working_idr"] = Getwd()
 	vals["home_dir"] = GetUserHomename()
-	vals["hardware_addr"] = GetCurrentInterface().HardwareAddr
+	vals["hardware_addr"] = GetCurrentInterfaceHardwareAddr()
 	vals["client_addrs"] = GetCurrentInterfaceAddrs()
 
 	if el.IndexName == "" {

logs/es/sys.go

@@ -15,6 +15,13 @@ func GetCurrentInterface() *net.Interface {
 	return nil
 }
 
+func GetCurrentInterfaceHardwareAddr() string {
+	if inter := GetCurrentInterface(); inter != nil {
+		return fmt.Sprintf("%s", inter.HardwareAddr)
+	}
+	return ""
+}
+
 func GetCurrentInterfaceAddrs() string {
 	if inter := GetCurrentInterface(); inter != nil {
 		if addrs, err := inter.Addrs(); err == nil {