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Golang: marshal and unmarshal iota (yaml, json, toml)

№ 11025 В разделе Programming от June 16th, 2020,
В подшивках: Go

Tried to unmarshal enum value from app config file and failed?

DB:
  masterDB: "ips.sdb"
  clean: Full

Use strings instead of iota.

const (
	CleanRecreate  = "Recreate" // completely remove DB file and create again
	CleanFull      = "Full" // delete all and vacuum
	CleanLastDay   = "LastDay" // remove all before last day
	CleanLastWeek  = "LastWeek"
	CleanLastMonth = "LastMonth"
	CleanNever     = "Never" // do nothing
)

type CleanType string

type AppConfig struct {
	DB    struct {
		MasterDB string    `yaml:"masterDB"`        // master sqlite database
		Clean    CleanType `yaml:"clean,omitempty"` // cleanup at startup
	} `yaml:"DB"`
}

Now load config file:

func main() {
	flag.Parse()
	if *configFilename == "" {
		log.Fatalln("Set configuration filename")
	}

	// read settings from file
	log.Println("Loading config file", *configFilename)
	appConfig := AppConfig{}

	yamlFile, err := ioutil.ReadFile(*configFilename)
	if err != nil {
		log.Fatalf("Config read error: %v\n", err)
	}
	err = yaml.Unmarshal(yamlFile, &appConfig)
	if err != nil {
		log.Fatalf("Config format error: %v\n", err)
	}

	switch appConfig.DB.Clean {
	case CleanRecreate:
		log.Println("Recreate cleanup option set")
		os.Remove(appConfig.DB.MasterDB)
	case CleanFull:
		log.Println("Full cleanup option set")
	case CleanLastDay:
		log.Println("Save only last day cleanup option set")
	case CleanLastWeek:
		log.Println("Save only last week option set")
	case CleanLastMonth:
		log.Println("Save only last month option set")
	}
	dbHandler := dbLoadFile(appConfig.DB.MasterDB)
	defer dbHandler.Close()
}

Here is another solution https://gist.github.com/lummie/7f5c237a17853c031a57277371528e87#file-enum-go

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