playlist retry-exhaustion handling

cmd/mxl-player/playlist_file.go

@@ -11,8 +11,9 @@ import (
 )
 
 type playlistFile struct {
-	Entries []playlistFileEntry `json:"entries"`
-	Loop    bool                `json:"loop"`
+	Entries   []playlistFileEntry `json:"entries"`
+	Loop      bool                `json:"loop"`
+	OnFailure string              `json:"on_failure"`
 }
 
 type playlistFileEntry struct {
@@ -62,6 +63,16 @@ func decodePlaylistFile(reader io.Reader) (playback.Playlist, error) {
 		Entries: make([]playback.PlaylistEntry, len(file.Entries)),
 		Loop:    file.Loop,
 	}
+	switch file.OnFailure {
+	case "", "wait":
+		playlist.OnFailure = playback.PlaylistFailureWait
+	case "next":
+		playlist.OnFailure = playback.PlaylistFailureNext
+	default:
+		return playback.Playlist{}, fmt.Errorf(
+			"on_failure %q: %w", file.OnFailure, playback.ErrPlaylistFailurePolicy,
+		)
+	}
 	for index, entry := range file.Entries {
 		duration := time.Duration(0)
 		if entry.Duration != "" {

cmd/mxl-player/playlist_file_test.go

@@ -14,6 +14,7 @@ import (
 func TestDecodePlaylistFile(t *testing.T) {
 	input := `{
         "loop": true,
+		"on_failure": "next",
         "entries": [
             {
                 "name": "sync",
@@ -44,7 +45,8 @@ func TestDecodePlaylistFile(t *testing.T) {
 		t.Fatalf("decodePlaylistFile() error = %v", err)
 	}
 	want := playback.Playlist{
-		Loop: true,
+		Loop:      true,
+		OnFailure: playback.PlaylistFailureNext,
 		Entries: []playback.PlaylistEntry{
 			{
 				Name:          "sync",
@@ -69,7 +71,7 @@ func TestDecodePlaylistFile(t *testing.T) {
 			},
 		},
 	}
-	if len(got.Entries) != len(want.Entries) || got.Loop != want.Loop {
+	if len(got.Entries) != len(want.Entries) || got.Loop != want.Loop || got.OnFailure != want.OnFailure {
 		t.Fatalf("decodePlaylistFile() = %#v, want %#v", got, want)
 	}
 	for index := range want.Entries {
@@ -100,6 +102,7 @@ func TestDecodePlaylistFileRejectsInvalidInput(t *testing.T) {
 		{name: "malformed JSON", input: `{"entries": [`, wantText: "decode JSON"},
 		{name: "unknown field", input: `{"unknown": true}`, wantText: "unknown field"},
 		{name: "multiple roots", input: `{"entries": []} {"entries": []}`, wantText: "multiple root values"},
+		{name: "invalid failure policy", input: `{"on_failure":"skip","entries":[]}`, wantErr: playback.ErrPlaylistFailurePolicy},
 		{
 			name:     "invalid duration",
 			input:    `{"entries":[{"video":{"domain":"/video","uuid":"video"},"duration":"later"}]}`,