func (s *Slave) Addr() string {
	return net.JoinHostPort(s.ip, s.port)
}
func (s *Slave) Addr() string {
	return net.JoinHostPort(s.ip, s.port)
}
func ( s * Slave ) Addr ( ) string { return net . JoinHostPort ( s . ip , s . port ) }
// Addr returns an address of slave.
Addr returns an address of slave .