config.go

package config

import (
    "log"
    "os"

    "gopkg.in/ini.v1"
)

type configList struct {
    APIKey         string
    APISecret      string
    LogFile        string
    DefaultRunMode string
}

// Config is Implementation of ConfigList
var Config configList

func init() {
    cfg, err := ini.Load("config.ini")
    if err != nil {
        log.Printf("Failed to read file: %v", err)
        os.Exit(1)
    }

    Config = configList{
        APIKey:      cfg.Section("api").Key("api_key").String(),
        APISecret:   cfg.Section("api").Key("api_secret").String(),
        LogFile:     cfg.Section("app").Key("log_file").String(),
        ProductCode: cfg.Section("app").Key("default_run_mode").String(),
    }
}

main.go

package main

import (
	"fmt"
	"sample/config"
)

func main() {
	// print config.ini values
	fmt.Println("APIKey: ", config.Config.APIKey)
	fmt.Println("APISecret: ", config.Config.APISecret)
	fmt.Println("LogFile: ", config.Config.LogFile)
	fmt.Println("DefaultRunMode: ", config.Config.DefaultRunMode)
}