Add inital multiple artist support

cmd/gonic/main.go

@@ -34,6 +34,7 @@ func main() {
 	confScanInterval := set.Int("scan-interval", 0, "interval (in minutes) to automatically scan music (optional)")
 	confJukeboxEnabled := set.Bool("jukebox-enabled", false, "whether the subsonic jukebox api should be enabled (optional)")
 	confProxyPrefix := set.String("proxy-prefix", "", "url path prefix to use if behind proxy. eg '/gonic' (optional)")
+	confGenreSplit := set.String("genre-split", "\n", "character or string to split genre tag data on (optional)")
 	confShowVersion := set.Bool("version", false, "show gonic version")
 	_ = set.String("config-path", "", "path to config (optional)")
 
@@ -85,6 +86,7 @@ func main() {
 		CachePath:      *confCachePath,
 		CoverCachePath: coverCachePath,
 		ProxyPrefix:    *confProxyPrefix,
+		GenreSplit:     *confGenreSplit,
 	})
 
 	var g run.Group

server/ctrlsubsonic/handlers_by_tags.go

@@ -82,7 +82,7 @@ func (c *Controller) ServeGetAlbum(r *http.Request) *spec.Response {
 		Select("albums.*, count(tracks.id) child_count, sum(tracks.length) duration").
 		Joins("LEFT JOIN tracks ON tracks.album_id=albums.id").
 		Preload("TagArtist").
-		Preload("TagGenre").
+		Preload("Genres").
 		Preload("Tracks", func(db *gorm.DB) *gorm.DB {
 			return db.Order("tracks.tag_disc_number, tracks.tag_track_number")
 		}).
@@ -123,8 +123,9 @@ func (c *Controller) ServeGetAlbumListTwo(r *http.Request) *spec.Response {
 			params.GetOrInt("toYear", 2200))
 		q = q.Order("tag_year")
 	case "byGenre":
-		q = q.Joins("JOIN genres ON albums.tag_genre_id=genres.id AND genres.name=?",
-			params.GetOr("genre", "Unknown Genre"))
+		genre, _ := params.Get("genre")
+		q = q.Joins("JOIN album_genres ON album_genres.album_id=albums.id")
+		q = q.Joins("JOIN genres ON genres.id=album_genres.genre_id AND genres.name=?", genre)
 	case "frequent":
 		user := r.Context().Value(CtxUser).(*db.User)
 		q = q.Joins("JOIN plays ON albums.id=plays.album_id AND plays.user_id=?",
@@ -291,8 +292,8 @@ func (c *Controller) ServeGetGenres(r *http.Request) *spec.Response {
 	var genres []*db.Genre
 	c.DB.
 		Select(`*,
-			(SELECT count(id) FROM albums WHERE tag_genre_id=genres.id) album_count,
-			(SELECT count(id) FROM tracks WHERE tag_genre_id=genres.id) track_count`).
+			(SELECT count(1) FROM album_genres WHERE genre_id=genres.id) album_count,
+			(SELECT count(1) FROM track_genres WHERE genre_id=genres.id) track_count`).
 		Group("genres.id").
 		Find(&genres)
 	sub := spec.NewResponse()
@@ -316,7 +317,8 @@ func (c *Controller) ServeGetSongsByGenre(r *http.Request) *spec.Response {
 	var tracks []*db.Track
 	c.DB.
 		Joins("JOIN albums ON tracks.album_id=albums.id").
-		Joins("JOIN genres ON tracks.tag_genre_id=genres.id AND genres.name=?", genre).
+		Joins("JOIN track_genres ON track_genres.track_id=tracks.id").
+		Joins("JOIN genres ON track_genres.genre_id=genres.id AND genres.name=?", genre).
 		Preload("Album").
 		Offset(params.GetOrInt("offset", 0)).
 		Limit(params.GetOrInt("count", 10)).

server/ctrlsubsonic/handlers_common.go

@@ -197,9 +197,9 @@ func (c *Controller) ServeGetRandomSongs(r *http.Request) *spec.Response {
 	params := r.Context().Value(CtxParams).(params.Params)
 	var tracks []*db.Track
 	q := c.DB.DB.
-		Joins("JOIN albums ON tracks.album_id=albums.id").
 		Limit(params.GetOrInt("size", 10)).
 		Preload("Album").
+		Joins("JOIN albums ON tracks.album_id=albums.id").
 		Order(gorm.Expr("random()"))
 	if year, err := params.GetInt("fromYear"); err == nil {
 		q = q.Where("albums.tag_year >= ?", year)
@@ -208,10 +208,8 @@ func (c *Controller) ServeGetRandomSongs(r *http.Request) *spec.Response {
 		q = q.Where("albums.tag_year <= ?", year)
 	}
 	if genre, err := params.Get("genre"); err == nil {
-		q = q.Joins(
-			"JOIN genres ON tracks.tag_genre_id=genres.id AND genres.name=?",
-			genre,
-		)
+		q = q.Joins("JOIN track_genres ON track_genres.track_id=tracks.id")
+		q = q.Joins("JOIN genres ON genres.id=track_genres.genre_id AND genres.name=?", genre)
 	}
 	q.Find(&tracks)
 	sub := spec.NewResponse()

server/ctrlsubsonic/spec/construct_by_tags.go

@@ -2,6 +2,7 @@ package spec
 
 import (
 	"path"
+	"strings"
 
 	"go.senan.xyz/gonic/server/db"
 )
@@ -13,11 +14,9 @@ func NewAlbumByTags(a *db.Album, artist *db.Artist) *Album {
 		Name:       a.TagTitle,
 		Year:       a.TagYear,
 		TrackCount: a.ChildCount,
+		Genre:      strings.Join(a.GenreStrings(), ", "),
 		Duration:   a.Duration,
 	}
-	if a.TagGenre != nil {
-		ret.Genre = a.TagGenre.Name
-	}
 	if a.Cover != "" {
 		ret.CoverID = a.SID()
 	}
@@ -47,6 +46,7 @@ func NewTrackByTags(t *db.Track, album *db.Album) *TrackChild {
 		),
 		Album:    album.TagTitle,
 		AlbumID:  album.SID(),
+		Genre:    strings.Join(t.GenreStrings(), ", "),
 		Duration: t.Length,
 		Bitrate:  t.Bitrate,
 		Type:     "music",

server/ctrlsubsonic/specid/ids.go

@@ -42,13 +42,17 @@ func New(in string) (ID, error) {
 	if err != nil {
 		return ID{}, fmt.Errorf("%q: %w", partValue, ErrNotAnInt)
 	}
-	for _, acc := range []IDT{Artist, Album, Track} {
-		if partType == string(acc) {
-			return ID{Type: acc, Value: val}, nil
-		}
-	}
+	switch IDT(partType) {
+	case Artist:
+		return ID{Type: Artist, Value: val}, nil
+	case Album:
+		return ID{Type: Album, Value: val}, nil
+	case Track:
+		return ID{Type: Track, Value: val}, nil
+	default:
 		return ID{}, fmt.Errorf("%q: %w", partType, ErrBadPrefix)
 	}
+}
 
 func (i ID) String() string {
 	if i.Value == 0 {

server/db/db.go

@@ -76,6 +76,7 @@ func New(path string) (*DB, error) {
 		migrateAddGenre(),
 		migrateUpdateTranscodePrefIDX(),
 		migrateAddAlbumIDX(),
+		migrateMultiGenre(),
 	))
 	if err = migr.Migrate(); err != nil {
 		return nil, fmt.Errorf("migrating to latest version: %w", err)

server/db/migrations.go

@@ -153,3 +153,19 @@ func migrateAddAlbumIDX() gormigrate.Migration {
 		},
 	}
 }
+
+func migrateMultiGenre() gormigrate.Migration {
+	return gormigrate.Migration{
+		ID: "202012151806",
+		Migrate: func(tx *gorm.DB) error {
+			return tx.AutoMigrate(
+				Track{},
+				Album{},
+				Genre{},
+				TrackGenre{},
+				AlbumGenre{},
+			).
+				Error
+		},
+	}
+}

server/db/model.go

@@ -63,9 +63,7 @@ func (a *Artist) IndexName() string {
 type Genre struct {
 	ID         int    `gorm:"primary_key"`
 	Name       string `gorm:"not null; unique_index"`
-	Albums     []*Album `gorm:"foreignkey:TagGenreID"`
 	AlbumCount int    `sql:"-"`
-	Tracks     []*Track `gorm:"foreignkey:TagGenreID"`
 	TrackCount int    `sql:"-"`
 }
 
@@ -79,6 +77,7 @@ type Track struct {
 	AlbumID        int `gorm:"not null; unique_index:idx_folder_filename" sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
 	Artist         *Artist
 	ArtistID       int      `gorm:"not null" sql:"default: null; type:int REFERENCES artists(id) ON DELETE CASCADE"`
+	Genres         []*Genre `gorm:"many2many:track_genres"`
 	Size           int      `gorm:"not null" sql:"default: null"`
 	Length         int      `sql:"default: null"`
 	Bitrate        int      `sql:"default: null"`
@@ -87,8 +86,6 @@ type Track struct {
 	TagTrackArtist string   `sql:"default: null"`
 	TagTrackNumber int      `sql:"default: null"`
 	TagDiscNumber  int      `sql:"default: null"`
-	TagGenre       *Genre
-	TagGenreID     int    `sql:"default: null; type:int REFERENCES genres(id)"`
 	TagBrainzID    string   `sql:"default: null"`
 }
 
@@ -128,6 +125,14 @@ func (t *Track) RelPath() string {
 	)
 }
 
+func (t *Track) GenreStrings() []string {
+	var strs []string
+	for _, genre := range t.Genres {
+		strs = append(strs, genre.Name)
+	}
+	return strs
+}
+
 type User struct {
 	ID            int `gorm:"primary_key"`
 	CreatedAt     time.Time
@@ -161,11 +166,10 @@ type Album struct {
 	RightPathUDec string `sql:"default: null"`
 	Parent        *Album
 	ParentID      int      `sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
+	Genres        []*Genre `gorm:"many2many:album_genres"`
 	Cover         string   `sql:"default: null"`
 	TagArtist     *Artist
 	TagArtistID   int    `gorm:"index" sql:"default: null; type:int REFERENCES artists(id) ON DELETE CASCADE"`
-	TagGenre      *Genre
-	TagGenreID    int    `sql:"default: null; type:int"`
 	TagTitle      string `sql:"default: null"`
 	TagTitleUDec  string `sql:"default: null"`
 	TagBrainzID   string `sql:"default: null"`
@@ -192,6 +196,14 @@ func (a *Album) IndexRightPath() string {
 	return a.RightPath
 }
 
+func (a *Album) GenreStrings() []string {
+	var strs []string
+	for _, genre := range a.Genres {
+		strs = append(strs, genre.Name)
+	}
+	return strs
+}
+
 type Playlist struct {
 	ID         int `gorm:"primary_key"`
 	CreatedAt  time.Time
@@ -243,3 +255,17 @@ type TranscodePreference struct {
 	Client  string `gorm:"not null; unique_index:idx_user_id_client" sql:"default: null"`
 	Profile string `gorm:"not null" sql:"default: null"`
 }
+
+type TrackGenre struct {
+	Track   *Track
+	TrackID int `gorm:"not null; unique_index:idx_track_id_genre_id" sql:"default: null; type:int REFERENCES tracks(id) ON DELETE CASCADE"`
+	Genre   *Genre
+	GenreID int `gorm:"not null; unique_index:idx_track_id_genre_id" sql:"default: null; type:int REFERENCES genres(id) ON DELETE CASCADE"`
+}
+
+type AlbumGenre struct {
+	Album   *Album
+	AlbumID int `gorm:"not null; unique_index:idx_album_id_genre_id" sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
+	Genre   *Genre
+	GenreID int `gorm:"not null; unique_index:idx_album_id_genre_id" sql:"default: null; type:int REFERENCES genres(id) ON DELETE CASCADE"`
+}

server/scanner/scanner.go

@@ -61,6 +61,7 @@ type Scanner struct {
 	db         *db.DB
 	musicPath  string
 	isFull     bool
+	genreSplit string
 	// these two are for the transaction we do for every folder.
 	// the boolean is there so we dont begin or commit multiple
 	// times in the handle folder or post children callback
@@ -78,10 +79,11 @@ type Scanner struct {
 	seenTracksNew int              // n tracks not seen before
 }
 
-func New(musicPath string, db *db.DB) *Scanner {
+func New(musicPath string, db *db.DB, genreSplit string) *Scanner {
 	return &Scanner{
 		db:         db,
 		musicPath:  musicPath,
+		genreSplit: genreSplit,
 	}
 }
 
@@ -368,6 +370,7 @@ func (s *Scanner) handleTrack(it *item) error {
 		s.trTx = s.db.Begin()
 		s.trTxOpen = true
 	}
+
 	// ** begin set track basics
 	track := &db.Track{}
 	defer func() {
@@ -404,16 +407,9 @@ func (s *Scanner) handleTrack(it *item) error {
 	track.TagBrainzID = trTags.BrainzID()
 	track.Length = trTags.Length()   // these two should be calculated
 	track.Bitrate = trTags.Bitrate() // ...from the file instead of tags
+
 	// ** begin set album artist basics
-	artistName := func() string {
-		if r := trTags.AlbumArtist(); r != "" {
-			return r
-		}
-		if r := trTags.Artist(); r != "" {
-			return r
-		}
-		return "Unknown Artist"
-	}()
+	artistName := firstTag("Unknown Artist", trTags.AlbumArtist, trTags.Artist)
 	artist := &db.Artist{}
 	err = s.trTx.
 		Select("id").
@@ -428,13 +424,13 @@ func (s *Scanner) handleTrack(it *item) error {
 		}
 	}
 	track.ArtistID = artist.ID
+
 	// ** begin set genre
-	genreName := func() string {
-		if r := trTags.Genre(); r != "" {
-			return r
-		}
-		return "Unknown Genre"
-	}()
+	genreTag := firstTag("Unknown Genre", trTags.Genre)
+	genres := strings.Split(genreTag, s.genreSplit)
+	genreIDs := []int{}
+	for _, genreName := range genres {
+		// TODO insert or ignore
 		genre := &db.Genre{}
 		err = s.trTx.
 			Select("id").
@@ -447,24 +443,47 @@ func (s *Scanner) handleTrack(it *item) error {
 				return fmt.Errorf("writing genres table: %w", err)
 			}
 		}
-	track.TagGenreID = genre.ID
+		genreIDs = append(genreIDs, genre.ID)
+	}
+
 	// ** begin save the track
 	if err := s.trTx.Save(track).Error; err != nil {
 		return fmt.Errorf("writing track table: %w", err)
 	}
+	for _, genreID := range genreIDs {
+		trackGenre := &db.TrackGenre{TrackID: track.ID, GenreID: genreID}
+		if err := s.trTx.Save(trackGenre).Error; err != nil {
+			return fmt.Errorf("writing track table: %w", err)
+		}
+	}
 	s.seenTracksNew++
+
 	// ** begin set album if this is the first track in the folder
 	folder := s.curFolders.Peek()
 	if !folder.ReceivedPaths || folder.ReceivedTags {
 		// the folder hasn't been modified or already has it's tags
 		return nil
 	}
+	for _, genreID := range genreIDs {
+		albumGenre := &db.AlbumGenre{AlbumID: folder.ID, GenreID: genreID}
+		if err := s.trTx.Save(albumGenre).Error; err != nil {
+			return fmt.Errorf("writing album table: %w", err)
+		}
+	}
 	folder.TagTitle = trTags.Album()
 	folder.TagTitleUDec = decoded(trTags.Album())
 	folder.TagBrainzID = trTags.AlbumBrainzID()
 	folder.TagYear = trTags.Year()
 	folder.TagArtistID = artist.ID
-	folder.TagGenreID = genre.ID
 	folder.ReceivedTags = true
 	return nil
 }
+
+func firstTag(fallback string, tags ...func() string) string {
+	for _, f := range tags {
+		if tag := f(); tag != "" {
+			return tag
+		}
+	}
+	return fallback
+}

server/server.go

@@ -26,6 +26,7 @@ type Options struct {
 	CachePath      string
 	CoverCachePath string
 	ProxyPrefix    string
+	GenreSplit     string
 }
 
 type Server struct {
@@ -40,7 +41,7 @@ func New(opts Options) *Server {
 	opts.MusicPath = filepath.Clean(opts.MusicPath)
 	opts.CachePath = filepath.Clean(opts.CachePath)
 	// ** begin controllers
-	scanner := scanner.New(opts.MusicPath, opts.DB)
+	scanner := scanner.New(opts.MusicPath, opts.DB, opts.GenreSplit)
 	jukebox := jukebox.New(opts.MusicPath)
 	// the base controller, it's fields/middlewares are embedded/used by the
 	// other two admin ui and subsonic controllers