feat: image variants engine

internal/infrastructure/useCases/variantCache.go

@@ -0,0 +1,51 @@
+package useCases
+
+import "RenewCMS/internal/domain/image"
+
+type VariantPurgeResult struct {
+	Files int
+	Bytes int64
+}
+
+type variantCache struct {
+	files   image.VariantFileRepository
+	storage image.Storage
+}
+
+func (c variantCache) purgeVariant(name string) (VariantPurgeResult, error) {
+	rows, err := c.files.ListByVariant(name)
+	if err != nil {
+		return VariantPurgeResult{}, err
+	}
+	return c.purge(rows)
+}
+
+func (c variantCache) purgeSource(storedName string) error {
+	rows, err := c.files.ListBySource(storedName)
+	if err != nil {
+		return err
+	}
+	_, err = c.purge(rows)
+	return err
+}
+
+func (c variantCache) purge(rows []image.VariantFile) (VariantPurgeResult, error) {
+	var result VariantPurgeResult
+	var failure error
+	for _, row := range rows {
+		if err := c.purgeRow(row); err != nil {
+			failure = err
+			continue
+		}
+		result.Files++
+		result.Bytes += row.Size
+	}
+	return result, failure
+}
+
+func (c variantCache) purgeRow(row image.VariantFile) error {
+	if err := c.storage.Delete(row.CachedName); err != nil {
+		return err
+	}
+	return c.files.Delete(row.ID)
+}