Refactoring to a cleaner architecture

domain/index.go

@@ -0,0 +1,18 @@
+package domain
+
+type ArtistInfo struct {
+	ArtistId string
+	Artist string
+}
+
+type ArtistIndex struct {
+	Id string
+	Artists []ArtistInfo
+}
+
+
+type ArtistIndexRepository interface {
+	Put(m *ArtistIndex) error
+	Get(id string) (*ArtistIndex, error)
+	GetAll() ([]ArtistIndex, error)
+}