logger.go
func (dl *DefaultLogger) Warn(message string, params ...interface{}) {
	dl.logger.Warnf(fmt.Sprintf("%s %s", caller(), message), params...)
}
func (dl *DefaultLogger) Warn(message string, params ...interface{}) {
	dl.logger.Warnf(fmt.Sprintf("%s %s", caller(), message), params...)
}
func ( dl * DefaultLogger ) Warn ( message string , params ... interface { } ) { dl . logger . Warnf ( fmt . Sprintf ( " " , caller ( ) , message ) , params ... ) }
// Warn formats a given message according to given params to log with level Warn.
Warn formats a given message according to given params to log with level Warn .