website/server/config/config.go

package config

import (
	"git.phc.dm.unipi.it/phc/website/libs/sl"

	"github.com/joho/godotenv"
)

type Config struct {
	Mode string
	Host string

	NpmCommand string
}

var Slot = sl.NewSlot[Config]()

func setFromEnvOrDefault(target *string, m map[string]string, key string, defaultValue string) {
	v, ok := m[key]
	if ok {
		*target = v
	} else {
		*target = defaultValue
	}
}

func Configure(l *sl.ServiceLocator) (Config, error) {
	env, err := godotenv.Read(".env")
	if err != nil {
		return Config{}, err
	}

	var cfg Config

	setFromEnvOrDefault(&cfg.Mode, env, "MODE", "production")
	setFromEnvOrDefault(&cfg.Host, env, "HOST", ":4000")
	setFromEnvOrDefault(&cfg.NpmCommand, env, "NPM_COMMAND", "npm")

	return cfg, nil
}

var ExampleProductionConfig = Config{
	Mode: "production",
	Host: ":4000",

	NpmCommand: "npm",
}

var ExampleDevelopmentConfig = Config{
	Mode: "development",
	Host: ":4000",

	NpmCommand: "npm",
}