add forget

internal/gofetch/gofetch.go

@@ -145,6 +145,11 @@ func (gf *GoFetch) Ignore(dl Downloadable) error {
 	return nil
 }
 
+func (gf *GoFetch) Forget(dl Downloadable) error {
+	hash := collector.Hash(dl)
+	return gf.memory.Del(hash)
+}
+
 func (gf *GoFetch) Stream(dl Downloadable) error {
 	return collector.WebTorrentDownloader{}.Download(dl)
 }

internal/memory/memory.go

@@ -11,6 +11,7 @@ type Memory interface {
 	Put(key string, value string) error
 	Get(key string) (*string, error)
 	Has(key string) bool
+	Del(key string) error
 	io.Closer
 }
 
@@ -84,6 +85,14 @@ func (m *memory) Has(key string) bool {
 	return exists
 }
 
+func (m *memory) Del(key string) error {
+	return m.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket(m.bucket)
+		err := b.Delete([]byte(key))
+		return err
+	})
+}
+
 func (m *memory) Close() error {
 	return m.db.Close()
 }