playlist retry-exhaustion handling

internal/playback/playlist.go

@@ -11,8 +11,34 @@ var (
 	ErrPlaylistEntryEmpty        = errors.New("playlist entry must contain at least one feed")
 	ErrPlaylistSyncFeedsRequired = errors.New("synchronized playlist entry requires both video and audio feeds")
 	ErrPlaylistDurationNegative  = errors.New("playlist entry duration cannot be negative")
+	ErrPlaylistFailurePolicy     = errors.New("invalid playlist failure policy")
 )
 
+type PlaylistFailurePolicy uint8
+
+const (
+	PlaylistFailureWait PlaylistFailurePolicy = iota
+	PlaylistFailureNext
+)
+
+func (p PlaylistFailurePolicy) String() string {
+	switch p {
+	case PlaylistFailureWait:
+		return "wait"
+	case PlaylistFailureNext:
+		return "next"
+	default:
+		return fmt.Sprintf("PlaylistFailurePolicy(%d)", uint8(p))
+	}
+}
+
+func (p PlaylistFailurePolicy) Validate() error {
+	if p != PlaylistFailureWait && p != PlaylistFailureNext {
+		return ErrPlaylistFailurePolicy
+	}
+	return nil
+}
+
 type PlaylistFeed struct {
 	Domain string
 	UUID   string
@@ -27,8 +53,9 @@ type PlaylistEntry struct {
 }
 
 type Playlist struct {
-	Entries []PlaylistEntry
-	Loop    bool
+	Entries   []PlaylistEntry
+	Loop      bool
+	OnFailure PlaylistFailurePolicy
 }
 
 func (f PlaylistFeed) IsConfigured() bool {
@@ -65,6 +92,9 @@ func (e PlaylistEntry) Validate() error {
 }
 
 func (p Playlist) Validate() error {
+	if err := p.OnFailure.Validate(); err != nil {
+		return err
+	}
 	for index, entry := range p.Entries {
 		if err := entry.Validate(); err != nil {
 			return fmt.Errorf("playlist entry %d: %w", index, err)