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golang env file

Restu Wahyu Saputra answered on October 4, 2021 Popularity 9/10 Helpfulness 3/10

answer golang env file

related golang env example

golang env file

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package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/fs"
	"log"
	"os"
	"reflect"
	"strings"
)

type Environtment struct {
	Url        string `json:"url" default:"https://devapi.klikbca.com/openapi/v1.0"`
	ClientId   string `json:"client_id" default:"abc123"`
	ClientKey  string `json:"client_key" default:"abc123"`
	PublicKey  string `json:"public_key" default:"MIGfMA0GCSqGSIb3DQEBAQUAA4GNAD"`
	PrivateKey string `json:"private_key" default:"CBiQKBgQCny7nVqNIh+QhsplvWxsRZiJGQ"`
	Path       string `json:"path" default:"/openapi/v1.0"`
	Env        string `json:"go_env" default:"development"`
}

var env Environtment = Environtment{}

func main() {
	if err := DotEnv(".env", &env); err != nil {
		log.Fatalf(err.Error())
	}

	fmt.Println(env.Url) // os.Getenv("URL")
}

func DotEnv(name string, config *Environtment) error {
	envMetadataMap := make(map[string]string)
	structElements := reflect.ValueOf(config).Elem()

	for i := 0; i < structElements.NumField(); i++ {
		structFieldsName := structElements.Type().Field(i).Name
		strucFieldName, _ := reflect.TypeOf(env).FieldByName(structFieldsName)

		keyStruct := strucFieldName.Tag.Get("json")
		valueStruct := strings.TrimSpace(strucFieldName.Tag.Get("default"))

		if err := os.Setenv(strings.ToUpper(keyStruct), valueStruct); err != nil {
			return err
		}

		envMetadataMap[strings.ToLower(keyStruct)] = valueStruct
	}

	if name != "" {
		cwd, err := os.Getwd()
		if err != nil {
			return err
		}

		fileExist, err := fs.Glob(os.DirFS(cwd), name)
		if err != nil {
			return err
		}

		if len(fileExist) <= 0 {
			return errors.New(fmt.Sprintf("No such %s file", name))
		}

		readFile, err := fs.ReadFile(os.DirFS(cwd), name)
		if err != nil {
			return err
		}

		readFileBytes := string(readFile)
		envMetadataSlice := strings.Split(readFileBytes, "\n")

		for i := 0; i < len(envMetadataSlice); i++ {
			metadatas := strings.Split(envMetadataSlice[i], "=")
			key := ""
			value := ""

			if metadatas[0] != "" {
				key = metadatas[0]
			}

			if metadatas[1] != "" {
				value = metadatas[1]
			}

			if err := os.Setenv(strings.ToUpper(key), value); err != nil {
				return err
			}

			envMetadataMap[strings.ToLower(key)] = strings.TrimSpace(value)
		}
	}

	envMetadataBytes, err := json.Marshal(envMetadataMap)
	if err != nil {
		return err
	}

	if err := json.Unmarshal(envMetadataBytes, config); err != nil {
		return err
	}

	return nil
}

Popularity 9/10 Helpfulness 3/10 Language go

Source: Grepper

Tags: env-file go

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Contributed on May 01 2023

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

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golang env example

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os.Setenv("GO_ENV", "production")
fmt.Println(os.Getenv("GO_ENV"))

Popularity 10/10 Helpfulness 3/10 Language go

Source: Grepper

Tags: env

Link to this answer
Share Copy Link

Contributed on Oct 04 2021

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

golang env file

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golang env file

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golang env example

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