logs

type Logger interface {
	Sub(name string) Logger
	Debug(args ...interface{})
	Info(args ...interface{})
	Warn(args ...interface{})
	Error(args ...interface{})
	Panic(args ...interface{})
	Fatal(args ...interface{})

	Debugf(template string, args ...interface{})
	Infof(template string, args ...interface{})
	Warnf(template string, args ...interface{})
	Errorf(template string, args ...interface{})
	Panicf(template string, args ...interface{})
	Fatalf(template string, args ...interface{})

	SetLevel(lvl string) error
}