Go Config

package config

import (
    "os"
    "sync"
)

type Config struct {
    Name string
}

func (c *Config) Refresh() {
    c.Name = os.Getenv("NAME")
    println("Refreshing")
}

var instance *Config
var once sync.Once

func GetConfig() *Config {
    once.Do(func() {
        println("getting config")
        instance = &Config{}
        instance.Refresh()
    })
    return instance
}