streamdata: metadata load helper

This loads metadata by ident.

Signed-off-by: Yonah <contrib@gensokyo.uk>

streamdata.go

@@ -197,3 +197,21 @@ func (c *Channel) Add(ident *Ident, f func(v *VOD, w io.Writer) error) error {
 
 	return nil
 }
+
+// Load loads the metadata of a [VOD] by [Ident] and returns its address.
+func (c *Channel) Load(ident *Ident) (*VOD, error) {
+	var v VOD
+	if r, err := c.root.Open(path.Join(
+		channelPathVOD,
+		ident.String(),
+	)); err != nil {
+		return nil, err
+	} else if err = json.NewDecoder(r).Decode(&v); err != nil {
+		_ = r.Close()
+		return nil, err
+	} else if err = r.Close(); err != nil {
+		return nil, err
+	} else {
+		return &v, nil
+	}
+}