Init once

translator.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io/fs"
 	"net/http"
+	"sync"
 
 	"github.com/pkg/errors"
 	"golang.org/x/text/language"
@@ -16,6 +17,7 @@ import (
 var defaultLanguage = language.Russian
 
 var (
+	initOnce sync.Once
 	builder  *catalog.Builder
 
 	supportedLanguages    []language.Tag
@@ -43,21 +45,27 @@ func TryTranslate(ctx context.Context, obj interface{}) (string, bool) {
 }
 
 func Init(fs fs.ReadDirFS) error {
+	var err error
+
+	initOnce.Do(func() {
 		if builder != nil {
-		return nil
+			return
 		}
 
 		initCatalog, err := internal.InitBuilder(fs)
 		if err != nil {
-		return errors.Wrap(err, "init catalog")
+			err = errors.Wrap(err, "init catalog")
+
+			return
 		}
 
 		builder = initCatalog
 
 		// Fill the local cache
 		GetLanguages()
+	})
 
-	return nil
+	return err
 }
 
 func GetPrinter(lang language.Tag) *message.Printer {
@@ -77,6 +85,10 @@ func GetPrinter(lang language.Tag) *message.Printer {
 
 func GetLanguages() []language.Tag {
 	if supportedLanguages == nil {
+		if builder == nil {
+			return nil
+		}
+
 		supportedLanguages = builder.Languages()
 
 		for idx := range supportedLanguages {