log

type Logger interface {
	Progressf(format string, args ...interface{})
	Printf(format string, args ...interface{})
	Infof(format string, args ...interface{})
	Noticef(format string, args ...interface{})
	Warnf(format string, args ...interface{})
	Errorf(format string, args ...interface{})
	Debugf(format string, args ...interface{})
}