log

type DefaultLogger struct {
	*zap.SugaredLogger
}

type Logger interface {
	// Debugf uses fmt.Sprintf to log a templated message.
	// DebugLevel logs are typically voluminous, and are usually disabled in
	// production.
	Debugf(template string, args ...interface{})

	// Infof uses fmt.Sprintf to log a templated message.
	// InfoLevel is the default logging priority.
	Infof(template string, args ...interface{})

	// Warnf uses fmt.Sprintf to log a templated message.
	// WarnLevel logs are more important than Info, but don't need individual
	// human review.
	Warnf(template string, args ...interface{})

	// Errorf uses fmt.Sprintf to log a templated message.
	// ErrorLevel logs are high-priority. If an application is running smoothly,
	// it shouldn't generate any error-level logs.
	Errorf(template string, args ...interface{})

	// DPanicf uses fmt.Sprintf to log a templated message. In development, the
	// DPanicLevel logs are particularly important errors. In development the
	// log panics after writing the message.
	DPanicf(template string, args ...interface{})

	// Panicf uses fmt.Sprintf to log a templated message, then panics.
	Panicf(template string, args ...interface{})

	// Fatalf uses fmt.Sprintf to log a templated message, then calls os.Exit.
	Fatalf(template string, args ...interface{})
}