Go Friendly Configs

Go_Friendly-configs-1_start.sh

#! /bin/bash

# ------------------------------------------------------------
# Downloads required packages
# ------------------------------------------------------------

# Realize is a Golang Task Runner performing live reloading
if [ ! -f $GOPATH/bin/realize ] && [ ! -d $GOPATH/src/github.com/oxequa/realize  ]; then
    
    echo "Realize not found. Downloading it for you..."
    go get github.com/oxequa/realize
    
    if [ $? -eq 0 ]; then
        echo "Successfully downloaded realize!"
    else
        echo "Failed downloading realize. Please get it at http://github.com/oxequa/realize"
        exit
    fi

fi

# ------------------------------------------------------------
# Config file
# ------------------------------------------------------------

# Duplicate the example config file to a real one (which is ignored by git)
if [ ! -f _config/global.json ]; then
    echo "Creating _config/global.json"
    cp _config/global.example.json _config/global.json
    echo "Done."
    echo ">>> Please open _config/global.json and update it with your config."
fi

# ------------------------------------------------------------
# Start
# ------------------------------------------------------------

# Start the app
echo "Starting app with realize..."
realize start --run main.go

Go_friendly-configs-2_main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"strconv"

	"github.com/spf13/viper"
)

func main() {
  
  // Get config from global.json thanks to Viper
	appName := viper.GetString("appName")
	port := viper.GetInt("server.port")
	goPort := ":" + strconv.Itoa(port)

  // HTTP
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintf(w, "Hello, you've requested: %s\n", r.URL.Path)
	})

	fmt.Println("Starting", appName, "on port", goPort)
	http.ListenAndServe(goPort, nil)
}

func init() {
	InitViper()
}

// Init Viper to use our config located in _config/global.json
func InitViper() {
	viper.SetConfigName("global")
	viper.AddConfigPath("_config")
	err := viper.ReadInConfig()

	if err != nil {
		log.Fatalf("Fatal error config file: %s \n", err)
	}
}

Go_Friendly-configs-3_global.example.json

{
    "appName": "MyApp",
    "server": {
        "port": 8080
    },
    "mongo": {
        "host": "localhost",
        "dbName": "myDatabase",
        "maxWait": 5
    },
    "oauth": {
        "google_client_id": "abcdefghijklmnopqrstuvwxyz.apps.googleusercontent.com",
        "google_client_secret": "abcdefghijklmnopqrstuvwxyz"
    }
}