Adding support for PostgreSQL as database

This adds support for a second database backend: PostgreSQL (in addition to sqlite3). This allows externailzing the database used by gonic.

cmd/gonic/gonic.go

@@ -3,6 +3,7 @@ package main
 
 import (
 	"context"
+	"encoding/base64"
 	"errors"
 	"expvar"
 	"flag"
@@ -26,6 +27,7 @@ import (
 
 	"github.com/google/shlex"
 	"github.com/gorilla/securecookie"
+	_ "github.com/jinzhu/gorm/dialects/postgres"
 	_ "github.com/jinzhu/gorm/dialects/sqlite"
 	"github.com/sentriz/gormstore"
 	"golang.org/x/sync/errgroup"
@@ -66,7 +68,12 @@ func main() {
 
 	confPlaylistsPath := flag.String("playlists-path", "", "path to your list of new or existing m3u playlists that gonic can manage")
 
-	confDBPath := flag.String("db-path", "gonic.db", "path to database (optional)")
+	confSqlitePath := flag.String("db-path", "gonic.db", "path to database (optional, default: gonic.db)")
+	confPostgresHost := flag.String("postgres-host", "", "name of the PostgreSQL gonicServer (optional)")
+	confPostgresPort := flag.Int("postgres-port", 5432, "port to use for PostgreSQL connection (optional, default: 5432)")
+	confPostgresName := flag.String("postgres-db", "gonic", "name of the PostgreSQL database (optional, default: gonic)")
+	confPostgresUser := flag.String("postgres-user", "gonic", "name of the PostgreSQL user (optional, default: gonic)")
+	confPostgresSslModel := flag.String("postgres-ssl-mode", "verify-full", "the ssl mode used for connecting to the PostreSQL instance (optional, default: verify-full)")
 
 	confScanIntervalMins := flag.Uint("scan-interval", 0, "interval (in minutes) to automatically scan music (optional)")
 	confScanAtStart := flag.Bool("scan-at-start-enabled", false, "whether to perform an initial scan at startup (optional)")
@@ -136,15 +143,20 @@ func main() {
 		log.Fatalf("couldn't create covers cache path: %v\n", err)
 	}
 
-	dbc, err := db.New(*confDBPath, db.DefaultOptions())
+	var dbc *db.DB
+	if len(*confPostgresHost) > 0 {
+		dbc, err = db.NewPostgres(*confPostgresHost, *confPostgresPort, *confPostgresName, *confPostgresUser, os.Getenv("GONIC_POSTGRES_PW"), *confPostgresSslModel)
+	} else {
+		dbc, err = db.NewSqlite3(*confSqlitePath, db.DefaultOptions())
+	}
 	if err != nil {
 		log.Fatalf("error opening database: %v\n", err)
 	}
 	defer dbc.Close()
 
 	err = dbc.Migrate(db.MigrationContext{
 		Production:        true,
-		DBPath:            *confDBPath,
+		DBPath:            *confSqlitePath,
 		OriginalMusicPath: confMusicPaths[0].path,
 		PlaylistsPath:     *confPlaylistsPath,
 		PodcastsPath:      *confPodcastPath,
@@ -225,17 +237,18 @@ func main() {
 		jukebx = jukebox.New()
 	}
 
-	sessKey, err := dbc.GetSetting("session_key")
+	encSessKey, err := dbc.GetSetting("session_key")
 	if err != nil {
 		log.Panicf("error getting session key: %v\n", err)
 	}
-	if sessKey == "" {
-		sessKey = string(securecookie.GenerateRandomKey(32))
-		if err := dbc.SetSetting("session_key", sessKey); err != nil {
+	sessKey, err := base64.StdEncoding.DecodeString(encSessKey)
+	if err != nil || len(sessKey) == 0 {
+		sessKey = securecookie.GenerateRandomKey(32)
+		if err := dbc.SetSetting("session_key", base64.StdEncoding.EncodeToString(sessKey)); err != nil {
 			log.Panicf("error setting session key: %v\n", err)
 		}
 	}
-	sessDB := gormstore.New(dbc.DB, []byte(sessKey))
+	sessDB := gormstore.New(dbc.DB, []byte(encSessKey))
 	sessDB.SessionOpts.HttpOnly = true
 	sessDB.SessionOpts.SameSite = http.SameSiteLaxMode
 

db/db.go

@@ -42,7 +42,7 @@ type DB struct {
 	*gorm.DB
 }
 
-func New(path string, options url.Values) (*DB, error) {
+func NewSqlite3(path string, options url.Values) (*DB, error) {
 	// https://github.com/mattn/go-sqlite3#connection-string
 	url := url.URL{
 		Scheme: "file",
@@ -53,13 +53,26 @@ func New(path string, options url.Values) (*DB, error) {
 	if err != nil {
 		return nil, fmt.Errorf("with gorm: %w", err)
 	}
+	return newDB(db)
+}
+
+func NewPostgres(host string, port int, databaseName string, username string, password string, sslmode string) (*DB, error) {
+	pathAndArgs := fmt.Sprintf("host=%s port=%d user=%s dbname=%s password=%s sslmode=%s", host, port, username, databaseName, password, sslmode)
+	db, err := gorm.Open("postgres", pathAndArgs)
+	if err != nil {
+		return nil, fmt.Errorf("with gorm: %w", err)
+	}
+	return newDB(db)
+}
+
+func newDB(db *gorm.DB) (*DB, error) {
 	db.SetLogger(log.New(os.Stdout, "gorm ", 0))
 	db.DB().SetMaxOpenConns(1)
 	return &DB{DB: db}, nil
 }
 
 func NewMock() (*DB, error) {
-	return New(":memory:", mockOptions())
+	return NewSqlite3(":memory:", mockOptions())
 }
 
 func (db *DB) InsertBulkLeftMany(table string, head []string, left int, col []int) error {
@@ -72,10 +85,11 @@ func (db *DB) InsertBulkLeftMany(table string, head []string, left int, col []in
 		rows = append(rows, "(?, ?)")
 		values = append(values, left, c)
 	}
-	q := fmt.Sprintf("INSERT OR IGNORE INTO %q (%s) VALUES %s",
+	q := fmt.Sprintf("INSERT INTO %q (%s) VALUES %s ON CONFLICT (%s) DO NOTHING",
 		table,
 		strings.Join(head, ", "),
 		strings.Join(rows, ", "),
+		strings.Join(head, ", "),
 	)
 	return db.Exec(q, values...).Error
 }
@@ -612,8 +626,8 @@ func join[T fmt.Stringer](in []T, sep string) string {
 	return strings.Join(strs, sep)
 }
 
-func Dump(ctx context.Context, db *gorm.DB, to string) error {
-	dest, err := New(to, url.Values{})
+func DumpToSqlite3(ctx context.Context, db *gorm.DB, to string) error {
+	dest, err := NewSqlite3(to, url.Values{})
 	if err != nil {
 		return fmt.Errorf("create dest db: %w", err)
 	}

db/migrations.go

@@ -179,12 +179,18 @@ func migrateAddGenre(tx *gorm.DB, _ MigrationContext) error {
 
 func migrateUpdateTranscodePrefIDX(tx *gorm.DB, _ MigrationContext) error {
 	var hasIDX int
-	tx.
-		Select("1").
-		Table("sqlite_master").
-		Where("type = ?", "index").
-		Where("name = ?", "idx_user_id_client").
-		Count(&hasIDX)
+	if tx.Dialect().GetName() == "sqlite3" {
+		tx.Select("1").
+			Table("sqlite_master").
+			Where("type = ?", "index").
+			Where("name = ?", "idx_user_id_client").
+			Count(&hasIDX)
+	} else if tx.Dialect().GetName() == "postgres" {
+		tx.Select("1").
+			Table("pg_indexes").
+			Where("indexname = ?", "idx_user_id_client").
+			Count(&hasIDX)
+	}
 	if hasIDX == 1 {
 		// index already exists
 		return nil
@@ -461,9 +467,15 @@ func migratePlaylistsQueuesToFullID(tx *gorm.DB, _ MigrationContext) error {
 	if err := step.Error; err != nil {
 		return fmt.Errorf("step migrate play_queues to full id: %w", err)
 	}
-	step = tx.Exec(`
+	if tx.Dialect().GetName() == "postgres" {
+		step = tx.Exec(`
+		UPDATE play_queues SET newcurrent=('tr-' || current)::varchar[200];
+	`)
+	} else {
+		step = tx.Exec(`
 		UPDATE play_queues SET newcurrent=('tr-' || CAST(current AS varchar(10)));
 	`)
+	}
 	if err := step.Error; err != nil {
 		return fmt.Errorf("step migrate play_queues to full id: %w", err)
 	}
@@ -590,7 +602,7 @@ func migrateAlbumArtistsMany2Many(tx *gorm.DB, _ MigrationContext) error {
 			return fmt.Errorf("step insert from albums: %w", err)
 		}
 
-		step = tx.Exec(`DROP INDEX idx_albums_tag_artist_id`)
+		step = tx.Exec(`DROP INDEX IF EXISTS idx_albums_tag_artist_id`)
 		if err := step.Error; err != nil {
 			return fmt.Errorf("step drop index: %w", err)
 		}
@@ -730,10 +742,10 @@ func migratePlaylistsPaths(tx *gorm.DB, ctx MigrationContext) error {
 }
 
 func backupDBPre016(tx *gorm.DB, ctx MigrationContext) error {
-	if !ctx.Production {
+	if ctx.Production {
 		return nil
 	}
-	return Dump(context.Background(), tx, fmt.Sprintf("%s.%d.bak", ctx.DBPath, time.Now().Unix()))
+	return DumpToSqlite3(context.Background(), tx, fmt.Sprintf("%s.%d.bak", ctx.DBPath, time.Now().Unix()))
 }
 
 func migrateAlbumTagArtistString(tx *gorm.DB, _ MigrationContext) error {
@@ -770,12 +782,22 @@ func migrateArtistAppearances(tx *gorm.DB, _ MigrationContext) error {
 		return fmt.Errorf("step transfer album artists: %w", err)
 	}
 
-	step = tx.Exec(`
+	if tx.Dialect().GetName() == "sqlite3" {
+		step = tx.Exec(`
 		INSERT OR IGNORE INTO artist_appearances (artist_id, album_id)
 		SELECT track_artists.artist_id, tracks.album_id
 		FROM track_artists
 		JOIN tracks ON tracks.id=track_artists.track_id
 	`)
+	} else {
+		step = tx.Exec(`
+		INSERT INTO artist_appearances (artist_id, album_id)
+		SELECT track_artists.artist_id, tracks.album_id
+		FROM track_artists
+		JOIN tracks ON tracks.id=track_artists.track_id
+		ON CONFLICT DO NOTHING
+	`)
+	}
 	if err := step.Error; err != nil {
 		return fmt.Errorf("step transfer album artists: %w", err)
 	}
@@ -795,7 +817,7 @@ func migrateTemporaryDisplayAlbumArtist(tx *gorm.DB, _ MigrationContext) error {
 	return tx.Exec(`
 		UPDATE albums
 		SET tag_album_artist=(
-			SELECT group_concat(artists.name, ', ')
+			SELECT string_agg(artists.name, ', ')
 			FROM artists
 			JOIN album_artists ON album_artists.artist_id=artists.id AND album_artists.album_id=albums.id
 			GROUP BY album_artists.album_id

mockfs/mockfs.go

@@ -309,7 +309,7 @@ func (m *MockFS) DumpDB(suffix ...string) {
 	p = append(p, suffix...)
 
 	destPath := filepath.Join(os.TempDir(), strings.Join(p, "-"))
-	if err := db.Dump(context.Background(), m.db.DB, destPath); err != nil {
+	if err := db.DumpToSqlite3(context.Background(), m.db.DB, destPath); err != nil {
 		m.t.Fatalf("dumping db: %v", err)
 	}
 

server/ctrlsubsonic/handlers_by_folder.go

@@ -31,13 +31,13 @@ func (c *Controller) ServeGetIndexes(r *http.Request) *spec.Response {
 	}
 	var folders []*db.Album
 	c.dbc.
-		Select("*, count(sub.id) child_count").
+		Select("albums.*, count(sub.id) child_count").
 		Preload("AlbumStar", "user_id=?", user.ID).
 		Preload("AlbumRating", "user_id=?", user.ID).
 		Joins("LEFT JOIN albums sub ON albums.id=sub.parent_id").
 		Where("albums.parent_id IN ?", rootQ.SubQuery()).
 		Group("albums.id").
-		Order("albums.right_path COLLATE NOCASE").
+		Order("albums.right_path").
 		Find(&folders)
 	// [a-z#] -> 27
 	indexMap := make(map[string]*spec.Index, 27)
@@ -80,7 +80,7 @@ func (c *Controller) ServeGetMusicDirectory(r *http.Request) *spec.Response {
 		Where("parent_id=?", id.Value).
 		Preload("AlbumStar", "user_id=?", user.ID).
 		Preload("AlbumRating", "user_id=?", user.ID).
-		Order("albums.right_path COLLATE NOCASE").
+		Order("albums.right_path").
 		Find(&childFolders)
 	for _, ch := range childFolders {
 		childrenObj = append(childrenObj, spec.NewTCAlbumByFolder(ch))

server/ctrlsubsonic/handlers_by_tags.go

@@ -26,13 +26,13 @@ func (c *Controller) ServeGetArtists(r *http.Request) *spec.Response {
 	user := r.Context().Value(CtxUser).(*db.User)
 	var artists []*db.Artist
 	q := c.dbc.
-		Select("*, count(album_artists.album_id) album_count").
+		Select("artists.*, count(album_artists.album_id) album_count").
 		Joins("JOIN album_artists ON album_artists.artist_id=artists.id").
 		Preload("ArtistStar", "user_id=?", user.ID).
 		Preload("ArtistRating", "user_id=?", user.ID).
 		Preload("Info").
 		Group("artists.id").
-		Order("artists.name COLLATE NOCASE")
+		Order("artists.name")
 	if m := getMusicFolder(c.musicPaths, params); m != "" {
 		q = q.
 			Joins("JOIN albums ON albums.id=album_artists.album_id").
@@ -230,7 +230,7 @@ func (c *Controller) ServeSearchThree(r *http.Request) *spec.Response {
 	// search artists
 	var artists []*db.Artist
 	q := c.dbc.
-		Select("*, count(albums.id) album_count").
+		Select("artists.*, count(albums.id) album_count").
 		Group("artists.id")
 	for _, s := range queries {
 		q = q.Where(`name LIKE ? OR name_u_dec LIKE ?`, s, s)

server/ctrlsubsonic/handlers_raw.go

@@ -256,7 +256,7 @@ func streamGetTransodePreference(dbc *db.DB, userID int, client string) (*db.Tra
 	var pref db.TranscodePreference
 	err := dbc.
 		Where("user_id=?", userID).
-		Where("client COLLATE NOCASE IN (?)", []string{"*", client}).
+		Where("client IN (?)", []string{"*", client}).
 		Order("client DESC"). // ensure "*" is last if it's there
 		First(&pref).
 		Error