load json config file and read keys

load_json_config.go

var config = make(map[string]interface{})

func loadConfig(path string) (err error) {
        if _, err := os.Stat(path); os.IsNotExist(err) {
                log.Fatal("config file path is not exist")
        }

        file, err := os.Open(path)
        if err != nil {
                log.Fatal("can not open: ", path)
        }

        data, err := ioutil.ReadAll(file)
        if err != nil {
                log.Fatalf("read %s faild\n", path)
        }

        err = json.Unmarshal(data, &config)
        if err != nil {
                log.Fatal("unmarshal data faild")
        }
        return
}

func getConfig(keys string) (data interface{}, err error) {
        ks := strings.Split(keys, ".")

        _data := config
        data = _data
        for _, k := range ks {
                if _, ok := data.(map[string]interface{}); !ok {
                        return nil, errors.New("get config " + k + " faild")
                } else {
                        _data = data.(map[string]interface{})
                }

                if _, ok := _data[k]; ok {
                        data = _data[k]
                } else {
                        return nil, errors.New("get config " + k + " faild")
                }
        }

        return
}