logger

type Interface interface {
	Debug(args ...interface{})
	Debugf(format string, args ...interface{})
	Info(args ...interface{})
	Infof(format string, args ...interface{})
	Warning(args ...interface{})
	Warningf(format string, args ...interface{})
	Error(args ...interface{})
	Errorf(format string, args ...interface{})
	Panic(args ...interface{})
	Panicf(format string, args ...interface{})
	Fatal(args ...interface{})
	Fatalf(format string, args ...interface{})
	SetExtraCallDepth(depth int)
	ResetExtraCallDepth()
}