logger

type Log interface {
	SetLevel(int)

	SetDepth(int)

	Debug(...interface{})
	Debugn(...interface{})
	Debugf(string, ...interface{})

	Info(...interface{})
	Infon(...interface{})
	Infof(string, ...interface{})

	Warn(...interface{})
	Warnn(...interface{})
	Warnf(string, ...interface{})

	Error(...interface{})
	Errorn(...interface{})
	Errorf(string, ...interface{})

	Fatal(...interface{})
	Fataln(...interface{})
	Fatalf(string, ...interface{})

	Panic(...interface{})
	Panicn(...interface{})
	Panicf(string, ...interface{})
}