logger

type DefaultLogger struct {
	Level int
}

type Logger interface {
	GetLevel() int
	Fatal(exitCode int, message interface{}, params ...interface{})
	Error(message interface{}, params ...interface{})
	Warn(message interface{}, params ...interface{})
	Info(message interface{}, params ...interface{})
	Debug(message interface{}, params ...interface{})
	Trace(message interface{}, params ...interface{})
}