perf(templates): Cache templates in map

main.go

@@ -74,7 +74,9 @@ func main() {
 	}
 
 	barcodeGenerator := &services.DefaultBarcodeService{}
-	staticService := &services.DefaultStaticService{}
+	staticService := &services.DefaultStaticService{
+		Cache: make(map[string]string),
+	}
 	handler := handlers.DefaultHandler{
 		Config:         config,
 		BarcodeService: barcodeGenerator,

services/templates.go

@@ -14,14 +14,24 @@ type StaticService interface {
 }
 
 type DefaultStaticService struct {
+	Cache map[string]string
 }
 
 func (s *DefaultStaticService) GetTemplate(locale, templateName string) (string, error) {
+
+	if s.Cache[locale+templateName] != "" {
+		log.Printf("returning cached template %s with locale %s", templateName, locale)
+		return s.Cache[locale+templateName], nil
+	}
+
 	content, err := os.ReadFile(fmt.Sprintf("static/templates/%s/%s.html", templateName, locale))
 	if content == nil || err != nil {
 		log.Printf("error reading template %s with locale %s: %v", templateName, locale, err)
 		return "", err
 	}
+
+	s.Cache[locale+templateName] = string(content)
+
 	return string(content), nil
 }