package config

import (
    "encoding/json"
    "io/ioutil"
    "sync"
)

var Cfg *Config

type Config struct {
    LicenseCode   string `json:"license_code"`
    ListenRTPPort int    `json:"listen_rtp_port"`
    MaxClients    int    `json:"max_clients"`
}

var (
    instance *Config
    once     sync.Once
)

func LoadConfig(filename string) *Config {
    once.Do(func() {
        data, err := ioutil.ReadFile(filename)
        if err != nil {
            panic(err)
        }
        instance = &Config{}
        if err := json.Unmarshal(data, instance); err != nil {
            panic(err)
        }
    })
    return instance
}