feat(services): Logging

services/templater.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"html/template"
 	"strings"
+
+	"go.uber.org/zap"
 )
 
 type Templater interface {
@@ -17,6 +19,7 @@ type Templater interface {
 type DefaultTemplater struct {
 	BarcodeService BarcodeService
 	StaticService  StaticService
+	Logger         *zap.SugaredLogger
 }
 
 func idToEan13(id string, prefix string) (string, error) {
@@ -48,10 +51,13 @@ func (t *DefaultTemplater) GenerateBarcode(code string, format string, prefix st
 }
 
 func (t *DefaultTemplater) SelectSponsorImage(id int) (string, error) {
+	logger := t.Logger.Named("SelectSponsorImage")
 	sponsors, err := t.StaticService.ListFilesInStaticSubFolder("images/sponsors")
 	if err != nil {
+		logger.Errorw("Failed to list sponsors", "error", err)
 		return "", err
 	}
+	logger.Debugw("Selected sponsor", "sponsors", sponsors, "id", id, "selected", sponsors[id%len(sponsors)])
 	return t.StaticService.GetImage("sponsors/" + strings.TrimSuffix(sponsors[id%len(sponsors)], ".base64")), nil
 }