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genvutils.go
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genvutils.go
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// Package genvutils provides useful environment operations
package genvutils
import (
"bufio"
"errors"
"os"
"reflect"
"strconv"
"strings"
)
//IsProduction checks if ENVIRONMENT value is equal to "PROD" or "PRODUCTION".
func IsProduction() bool {
if os.Getenv("ENVIRONMENT") == "PROD" {
return true
}
if os.Getenv("ENVIRONMENT") == "PRODUCTION" {
return true
}
if os.Getenv("APP_ENV") == "PROD" {
return true
}
if os.Getenv("APP_ENV") == "PRODUCTION" {
return true
}
return false
}
//IsStaging checks if ENVIRONMENT value is equal to "STAGE" or "STAGING".
func IsStaging() bool {
if os.Getenv("ENVIRONMENT") == "STAGE" {
return true
}
if os.Getenv("ENVIRONMENT") == "STAGING" {
return true
}
if os.Getenv("APP_ENV") == "STAGE" {
return true
}
if os.Getenv("APP_ENV") == "STAGING" {
return true
}
return false
}
//IsDevelopment checks if ENVIRONMENT value is equal to "DEV" or "DEVELOPMENT".
func IsDevelopment() bool {
if os.Getenv("ENVIRONMENT") == "DEV" {
return true
}
if os.Getenv("ENVIRONMENT") == "DEVELOPMENT" {
return true
}
if os.Getenv("APP_ENV") == "DEV" {
return true
}
if os.Getenv("APP_ENV") == "DEVELOPMENT" {
return true
}
return false
}
//IsTesting checks if ENVIRONMENT value is equal to "TEST" or "TESTING".
func IsTesting() bool {
if os.Getenv("ENVIRONMENT") == "TEST" {
return true
}
if os.Getenv("ENVIRONMENT") == "TESTING" {
return true
}
if os.Getenv("APP_ENV") == "TEST" {
return true
}
if os.Getenv("APP_ENV") == "TESTING" {
return true
}
return false
}
//GetEnv extracts env value by provided key, otherwise falls back to second function argument.
func GetEnv(key string, fallback string) string {
if value, ok := os.LookupEnv(key); ok {
return value
}
return fallback
}
//Parse function will parse given pointer to struct and fill it with env values.
//
// type serverConfig struct {
// ServerPort string `genv:"SERVER_PORT,8080"`
// MongoUrl string `genv:"MONGO_URL,mongodb://localhost:27017"`
// }
//
// Here is an example of struct. Good reading about reflect https://github.com/a8m/reflect-examples
func Parse(income interface{}) error {
t := reflect.TypeOf(income).Elem()
v := reflect.ValueOf(income).Elem()
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
value := v.FieldByName(field.Name)
tag := field.Tag.Get("genv")
tagS := strings.Split(tag, ",")
if value.CanSet() && value.IsValid() {
switch len(tagS) {
case 0:
break
default:
envVarValue := strings.TrimSpace(GetEnv(tagS[0], strings.Join(tagS[1:], ",")))
switch value.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
envVarValueF, _ := strconv.ParseInt(envVarValue, 10, 64)
value.SetInt(envVarValueF)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
envVarValueF, _ := strconv.ParseUint(envVarValue, 10, 64)
value.SetUint(envVarValueF)
case reflect.Float32, reflect.Float64:
envVarValueF, _ := strconv.ParseFloat(envVarValue, 64)
value.SetFloat(envVarValueF)
case reflect.String:
value.SetString(envVarValue)
case reflect.Bool:
envVarValueF, _ := strconv.ParseBool(envVarValue)
value.SetBool(envVarValueF)
}
}
}
}
return nil
}
//Load function is going to parse given dot environment file or chose one
// from priority list and set environment variables.
//
// !!! It will not override already set variables. Except .env.local
//
// Priority list is next (top -> bottom):
//.env.production.local
//.env.test.local
//.env.development.local
//.env.production
//.env.test
//.env.development
//.env.local !!! will override existing values.
//.env
func Load(filenames ...string) error {
if len(filenames) == 0 {
envFileName, err := getFromPriorityList()
if err != nil {
return err
}
filenames = append(filenames, envFileName)
}
for _, filename := range filenames {
envMap, err := parseDotEnvFile(filename)
if err != nil {
return err
}
for k, v := range envMap {
if os.Getenv(k) == "" || filename == ".env.local" {
err := os.Setenv(k, v)
if err != nil {
return err
}
}
}
}
return nil
}
func fileExists(name string) bool {
info, err := os.Stat(name)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
var ErrDotenvNotFound = errors.New("genvutils: no dot environment files found")
func getFromPriorityList() (string, error) {
priorityList := []string{
".env.production.local",
".env.qa.local",
".env.test.local",
".env.development.local",
".env.production",
".env.qa",
".env.test",
".env.development",
".env.local",
".env",
}
for _, envFile := range priorityList {
if fileExists(envFile) {
return envFile, nil
}
}
return "", ErrDotenvNotFound
}
func parseDotEnvFile(filename string) (map[string]string, error) {
if !fileExists(filename) {
return nil, ErrDotenvNotFound
}
file, err := os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
envMap := make(map[string]string)
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
return nil, err
}
for _, fullLine := range lines {
if !isComment(fullLine) {
key, value := parseLine(fullLine)
if key != "" && value != "" { //skip empty lines
envMap[key] = value
}
}
}
return envMap, nil
}
func isComment(line string) bool {
return strings.HasPrefix(line, "#")
}
func parseLine(fullLine string) (string, string) {
fullLine = strings.Split(fullLine, "#")[0]
fullLineSplit := strings.Split(fullLine, "=")
return strings.TrimSpace(fullLineSplit[0]), stripQuotes(strings.TrimSpace(strings.Join(fullLineSplit[1:], ",")))
}
func stripQuotes(text string) string {
if len(text) > 0 && (text[0] == '"' || text[0] == '\'') {
text = text[1:]
}
if len(text) > 0 && (text[len(text)-1] == '"' || text[len(text)-1] == '\'') {
text = text[:len(text)-1]
}
return text
}