logger

type LogInfo struct {
	Path   string `yaml:"path" json:"path"`
	Level  string `yaml:"level" json:"level" default:"info" validate:"regexp=^(info|debug|warn|error)$"`
	Format string `yaml:"format" json:"format" default:"text" validate:"regexp=^(text|json)$"`
	Age    struct {
		Max int `yaml:"max" json:"max" default:"15" validate:"min=1"`
	} `yaml:"age" json:"age"` // days
	Size struct {
		Max int `yaml:"max" json:"max" default:"50" validate:"min=1"`
	} `yaml:"size" json:"size"` // in MB
	Backup struct {
		Max int `yaml:"max" json:"max" default:"15" validate:"min=1"`
	} `yaml:"backup" json:"backup"`
}

type Logger interface {
	WithField(key string, value interface{}) Logger
	WithError(err error) Logger
	Debugf(format string, args ...interface{})
	Infof(format string, args ...interface{})
	Warnf(format string, args ...interface{})
	Errorf(format string, args ...interface{})
	Fatalf(format string, args ...interface{})
	Debugln(args ...interface{})
	Infoln(args ...interface{})
	Warnln(args ...interface{})
	Errorln(args ...interface{})
	Fatalln(args ...interface{})
}