/
scanner.go
743 lines (637 loc) · 20.5 KB
/
scanner.go
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//nolint:nestif
package scanner
import (
"errors"
"fmt"
"io/fs"
"log"
"os"
"path/filepath"
"regexp"
"slices"
"sort"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/fsnotify/fsnotify"
"github.com/jinzhu/gorm"
"github.com/rainycape/unidecode"
"go.senan.xyz/gonic/db"
"go.senan.xyz/gonic/fileutil"
"go.senan.xyz/gonic/tags/tagcommon"
)
var (
ErrAlreadyScanning = errors.New("already scanning")
ErrReadingTags = errors.New("could not read tags")
)
type Scanner struct {
db *db.DB
musicDirs []string
multiValueSettings map[Tag]MultiValueSetting
tagReader tagcommon.Reader
excludePattern *regexp.Regexp
scanning *int32
}
func New(musicDirs []string, db *db.DB, multiValueSettings map[Tag]MultiValueSetting, tagReader tagcommon.Reader, excludePattern string) *Scanner {
var excludePatternRegExp *regexp.Regexp
if excludePattern != "" {
excludePatternRegExp = regexp.MustCompile(excludePattern)
}
return &Scanner{
db: db,
musicDirs: musicDirs,
multiValueSettings: multiValueSettings,
tagReader: tagReader,
excludePattern: excludePatternRegExp,
scanning: new(int32),
}
}
func (s *Scanner) IsScanning() bool { return atomic.LoadInt32(s.scanning) == 1 }
func (s *Scanner) StartScanning() bool { return atomic.CompareAndSwapInt32(s.scanning, 0, 1) }
func (s *Scanner) StopScanning() { defer atomic.StoreInt32(s.scanning, 0) }
type ScanOptions struct {
IsFull bool
}
func (s *Scanner) ScanAndClean(opts ScanOptions) (*State, error) {
if !s.StartScanning() {
return nil, ErrAlreadyScanning
}
defer s.StopScanning()
start := time.Now()
st := &State{
seenTracks: map[int]struct{}{},
seenAlbums: map[int]struct{}{},
isFull: opts.IsFull,
}
log.Println("starting scan")
defer func() {
log.Printf("finished scan in %s, +%d/%d tracks (%d err)\n",
durSince(start), st.SeenTracksNew(), st.SeenTracks(), len(st.errs))
}()
for _, dir := range s.musicDirs {
err := filepath.WalkDir(dir, func(absPath string, d fs.DirEntry, err error) error {
return s.scanCallback(st, absPath, d, err)
})
if err != nil {
return nil, fmt.Errorf("walk: %w", err)
}
}
if err := s.cleanTracks(st); err != nil {
return nil, fmt.Errorf("clean tracks: %w", err)
}
if err := s.cleanAlbums(st); err != nil {
return nil, fmt.Errorf("clean albums: %w", err)
}
if err := s.cleanArtists(st); err != nil {
return nil, fmt.Errorf("clean artists: %w", err)
}
if err := s.cleanGenres(st); err != nil {
return nil, fmt.Errorf("clean genres: %w", err)
}
if err := s.db.SetSetting(db.LastScanTime, strconv.FormatInt(time.Now().Unix(), 10)); err != nil {
return nil, fmt.Errorf("set scan time: %w", err)
}
return st, errors.Join(st.errs...)
}
func (s *Scanner) ExecuteWatch(done <-chan struct{}) error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return fmt.Errorf("creating watcher: %w", err)
}
defer watcher.Close()
const batchInterval = 10 * time.Second
batchT := time.NewTimer(batchInterval)
batchT.Stop()
for _, dir := range s.musicDirs {
err := filepath.WalkDir(dir, func(absPath string, d fs.DirEntry, err error) error {
return watchCallback(watcher, absPath, d, err)
})
if err != nil {
log.Printf("error watching directory tree: %v\n", err)
continue
}
}
batchSeen := map[string]struct{}{}
for {
select {
case <-batchT.C:
if !s.StartScanning() {
break
}
for absPath := range batchSeen {
st := &State{
seenTracks: map[int]struct{}{},
seenAlbums: map[int]struct{}{},
}
err := filepath.WalkDir(absPath, func(absPath string, d fs.DirEntry, err error) error {
return watchCallback(watcher, absPath, d, err)
})
if err != nil {
log.Printf("error watching directory tree: %v\n", err)
continue
}
err = filepath.WalkDir(absPath, func(absPath string, d fs.DirEntry, err error) error {
return s.scanCallback(st, absPath, d, err)
})
if err != nil {
log.Printf("error walking: %v", err)
continue
}
}
s.StopScanning()
clear(batchSeen)
case event := <-watcher.Events:
if event.Op&(fsnotify.Create|fsnotify.Write) == 0 {
break
}
fileInfo, err := os.Stat(event.Name)
if err != nil {
break
}
if fileInfo.IsDir() {
batchSeen[event.Name] = struct{}{}
} else {
batchSeen[filepath.Dir(event.Name)] = struct{}{}
}
batchT.Reset(batchInterval)
case err := <-watcher.Errors:
log.Printf("error from watcher: %v\n", err)
case <-done:
return nil
}
}
}
func watchCallback(watcher *fsnotify.Watcher, absPath string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
switch d.Type() {
case os.ModeDir:
case os.ModeSymlink:
return symWalk(absPath, func(subAbs string, d fs.DirEntry, err error) error {
return watchCallback(watcher, subAbs, d, err)
})
default:
return nil
}
if err := watcher.Add(absPath); err != nil {
return fmt.Errorf("add path to watcher: %w", err)
}
return nil
}
func (s *Scanner) scanCallback(st *State, absPath string, d fs.DirEntry, err error) error {
if err != nil {
st.errs = append(st.errs, err)
return nil
}
switch d.Type() {
case os.ModeDir:
case os.ModeSymlink:
return symWalk(absPath, func(subAbs string, d fs.DirEntry, err error) error {
return s.scanCallback(st, subAbs, d, err)
})
default:
return nil
}
if s.excludePattern != nil && s.excludePattern.MatchString(absPath) {
log.Printf("excluding folder %q", absPath)
return nil
}
log.Printf("processing folder %q", absPath)
return s.db.Transaction(func(tx *db.DB) error {
if err := s.scanDir(tx, st, absPath); err != nil {
st.errs = append(st.errs, fmt.Errorf("%q: %w", absPath, err))
return nil
}
return nil
})
}
func (s *Scanner) scanDir(tx *db.DB, st *State, absPath string) error {
musicDir, relPath := musicDirRelative(s.musicDirs, absPath)
if musicDir == absPath {
return nil
}
items, err := os.ReadDir(absPath)
if err != nil {
return err
}
var tracks []string
var cover string
for _, item := range items {
absPath := filepath.Join(absPath, item.Name())
if s.excludePattern != nil && s.excludePattern.MatchString(absPath) {
log.Printf("excluding path %q", absPath)
continue
}
if item.IsDir() {
continue
}
if isCover(item.Name()) {
cover = item.Name()
continue
}
if s.tagReader.CanRead(absPath) {
tracks = append(tracks, item.Name())
continue
}
}
pdir, pbasename := filepath.Split(filepath.Dir(relPath))
var parent db.Album
if err := tx.Where("root_dir=? AND left_path=? AND right_path=?", musicDir, pdir, pbasename).Assign(db.Album{RootDir: musicDir, LeftPath: pdir, RightPath: pbasename}).FirstOrCreate(&parent).Error; err != nil {
return fmt.Errorf("first or create parent: %w", err)
}
st.seenAlbums[parent.ID] = struct{}{}
dir, basename := filepath.Split(relPath)
var album db.Album
if err := populateAlbumBasics(tx, musicDir, &parent, &album, dir, basename, cover); err != nil {
return fmt.Errorf("populate album basics: %w", err)
}
st.seenAlbums[album.ID] = struct{}{}
sort.Strings(tracks)
for i, basename := range tracks {
absPath := filepath.Join(musicDir, relPath, basename)
if err := s.populateTrackAndArtists(tx, st, i, &album, basename, absPath); err != nil {
return fmt.Errorf("populate track %q: %w", basename, err)
}
}
return nil
}
func (s *Scanner) populateTrackAndArtists(tx *db.DB, st *State, i int, album *db.Album, basename string, absPath string) error {
stat, err := os.Stat(absPath)
if err != nil {
return fmt.Errorf("stating %q: %w", basename, err)
}
var track db.Track
if err := tx.Where("album_id=? AND filename=?", album.ID, filepath.Base(basename)).First(&track).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
return fmt.Errorf("query track: %w", err)
}
if !st.isFull && track.ID != 0 && stat.ModTime().Before(track.UpdatedAt) {
st.seenTracks[track.ID] = struct{}{}
return nil
}
trags, err := s.tagReader.Read(absPath)
if err != nil {
return fmt.Errorf("%w: %w", err, ErrReadingTags)
}
genreNames := ParseMulti(s.multiValueSettings[Genre], tagcommon.MustGenres(trags), tagcommon.MustGenre(trags))
genreIDs, err := populateGenres(tx, genreNames)
if err != nil {
return fmt.Errorf("populate genres: %w", err)
}
// metadata for the album table comes only from the first track's tags
if i == 0 {
if err := tx.Where("album_id=?", album.ID).Delete(db.ArtistAppearances{}).Error; err != nil {
return fmt.Errorf("delete artist appearances: %w", err)
}
albumArtistNames := ParseMulti(s.multiValueSettings[AlbumArtist], tagcommon.MustAlbumArtists(trags), tagcommon.MustAlbumArtist(trags))
var albumArtistIDs []int
for _, albumArtistName := range albumArtistNames {
albumArtist, err := populateArtist(tx, albumArtistName)
if err != nil {
return fmt.Errorf("populate album artist: %w", err)
}
albumArtistIDs = append(albumArtistIDs, albumArtist.ID)
}
if err := populateAlbumArtists(tx, album, albumArtistIDs); err != nil {
return fmt.Errorf("populate album artists: %w", err)
}
if err := populateArtistAppearances(tx, album, albumArtistIDs); err != nil {
return fmt.Errorf("populate track artists: %w", err)
}
if err := populateAlbum(tx, album, trags, stat.ModTime()); err != nil {
return fmt.Errorf("populate album: %w", err)
}
if err := populateAlbumGenres(tx, album, genreIDs); err != nil {
return fmt.Errorf("populate album genres: %w", err)
}
}
if err := populateTrack(tx, album, &track, trags, basename, int(stat.Size())); err != nil {
return fmt.Errorf("process %q: %w", basename, err)
}
if err := populateTrackGenres(tx, &track, genreIDs); err != nil {
return fmt.Errorf("populate track genres: %w", err)
}
trackArtistNames := ParseMulti(s.multiValueSettings[Artist], tagcommon.MustArtists(trags), tagcommon.MustArtist(trags))
var trackArtistIDs []int
for _, trackArtistName := range trackArtistNames {
trackArtist, err := populateArtist(tx, trackArtistName)
if err != nil {
return fmt.Errorf("populate track artist: %w", err)
}
trackArtistIDs = append(trackArtistIDs, trackArtist.ID)
}
if err := populateTrackArtists(tx, &track, trackArtistIDs); err != nil {
return fmt.Errorf("populate track artists: %w", err)
}
if err := populateArtistAppearances(tx, album, trackArtistIDs); err != nil {
return fmt.Errorf("populate track artists: %w", err)
}
st.seenTracks[track.ID] = struct{}{}
st.seenTracksNew++
return nil
}
func populateAlbum(tx *db.DB, album *db.Album, trags tagcommon.Info, modTime time.Time) error {
albumName := tagcommon.MustAlbum(trags)
album.TagTitle = albumName
album.TagTitleUDec = decoded(albumName)
album.TagAlbumArtist = tagcommon.MustAlbumArtist(trags)
album.TagBrainzID = trags.AlbumBrainzID()
album.TagYear = trags.Year()
album.ModifiedAt = modTime
if album.CreatedAt.After(modTime) {
album.CreatedAt = modTime // reset created at to match filesytem for new albums
}
if err := tx.Save(&album).Error; err != nil {
return fmt.Errorf("saving album: %w", err)
}
return nil
}
func populateAlbumBasics(tx *db.DB, musicDir string, parent, album *db.Album, dir, basename string, cover string) error {
if err := tx.Where("root_dir=? AND left_path=? AND right_path=?", musicDir, dir, basename).First(album).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
return fmt.Errorf("find album: %w", err)
}
// see if we can save ourselves from an extra write if it's found and nothing has changed
if album.ID != 0 && album.Cover == cover && album.ParentID == parent.ID {
return nil
}
album.RootDir = musicDir
album.LeftPath = dir
album.RightPath = basename
album.Cover = cover
album.RightPathUDec = decoded(basename)
album.ParentID = parent.ID
if err := tx.Save(&album).Error; err != nil {
return fmt.Errorf("saving album: %w", err)
}
return nil
}
func populateTrack(tx *db.DB, album *db.Album, track *db.Track, trags tagcommon.Info, absPath string, size int) error {
basename := filepath.Base(absPath)
track.Filename = basename
track.FilenameUDec = decoded(basename)
track.Size = size
track.AlbumID = album.ID
track.TagTitle = trags.Title()
track.TagTitleUDec = decoded(trags.Title())
track.TagTrackArtist = tagcommon.MustArtist(trags)
track.TagTrackNumber = trags.TrackNumber()
track.TagDiscNumber = trags.DiscNumber()
track.TagBrainzID = trags.BrainzID()
track.Length = trags.Length() // these two should be calculated
track.Bitrate = trags.Bitrate() // ...from the file instead of tags
if err := tx.Save(&track).Error; err != nil {
return fmt.Errorf("saving track: %w", err)
}
return nil
}
func populateArtist(tx *db.DB, artistName string) (*db.Artist, error) {
var update db.Artist
update.Name = artistName
update.NameUDec = decoded(artistName)
var artist db.Artist
if err := tx.Where("name=?", artistName).Assign(update).FirstOrCreate(&artist).Error; err != nil {
return nil, fmt.Errorf("find or create artist: %w", err)
}
return &artist, nil
}
func populateGenres(tx *db.DB, names []string) ([]int, error) {
var filteredNames []string
for _, name := range names {
if clean := strings.TrimSpace(name); clean != "" {
filteredNames = append(filteredNames, clean)
}
}
if len(filteredNames) == 0 {
return []int{}, nil
}
var ids []int
for _, name := range filteredNames {
var genre db.Genre
if err := tx.FirstOrCreate(&genre, db.Genre{Name: name}).Error; err != nil {
return nil, fmt.Errorf("find or create genre: %w", err)
}
ids = append(ids, genre.ID)
}
return ids, nil
}
func populateTrackGenres(tx *db.DB, track *db.Track, genreIDs []int) error {
if err := tx.Where("track_id=?", track.ID).Delete(db.TrackGenre{}).Error; err != nil {
return fmt.Errorf("delete old track genre records: %w", err)
}
if err := tx.InsertBulkLeftMany("track_genres", []string{"track_id", "genre_id"}, track.ID, genreIDs); err != nil {
return fmt.Errorf("insert bulk track genres: %w", err)
}
return nil
}
func populateAlbumGenres(tx *db.DB, album *db.Album, genreIDs []int) error {
if err := tx.Where("album_id=?", album.ID).Delete(db.AlbumGenre{}).Error; err != nil {
return fmt.Errorf("delete old album genre records: %w", err)
}
if err := tx.InsertBulkLeftMany("album_genres", []string{"album_id", "genre_id"}, album.ID, genreIDs); err != nil {
return fmt.Errorf("insert bulk album genres: %w", err)
}
return nil
}
func populateAlbumArtists(tx *db.DB, album *db.Album, albumArtistIDs []int) error {
if err := tx.Where("album_id=?", album.ID).Delete(db.AlbumArtist{}).Error; err != nil {
return fmt.Errorf("delete old album artists: %w", err)
}
if err := tx.InsertBulkLeftMany("album_artists", []string{"album_id", "artist_id"}, album.ID, albumArtistIDs); err != nil {
return fmt.Errorf("insert bulk album artists: %w", err)
}
return nil
}
func populateTrackArtists(tx *db.DB, track *db.Track, trackArtistIDs []int) error {
if err := tx.Where("track_id=?", track.ID).Delete(db.TrackArtist{}).Error; err != nil {
return fmt.Errorf("delete old track artists: %w", err)
}
if err := tx.InsertBulkLeftMany("track_artists", []string{"track_id", "artist_id"}, track.ID, trackArtistIDs); err != nil {
return fmt.Errorf("insert bulk track artists: %w", err)
}
return nil
}
func populateArtistAppearances(tx *db.DB, album *db.Album, artistIDs []int) error {
if err := tx.InsertBulkLeftMany("artist_appearances", []string{"album_id", "artist_id"}, album.ID, artistIDs); err != nil {
return fmt.Errorf("insert bulk track artists: %w", err)
}
return nil
}
func (s *Scanner) cleanTracks(st *State) error {
start := time.Now()
defer func() { log.Printf("finished clean tracks in %s, %d removed", durSince(start), st.TracksMissing()) }()
var all []int
err := s.db.
Model(&db.Track{}).
Pluck("id", &all).
Error
if err != nil {
return fmt.Errorf("plucking ids: %w", err)
}
for _, a := range all {
if _, ok := st.seenTracks[a]; !ok {
st.tracksMissing = append(st.tracksMissing, int64(a))
}
}
return s.db.TransactionChunked(st.tracksMissing, func(tx *db.DB, chunk []int64) error {
return tx.Where(chunk).Delete(&db.Track{}).Error
})
}
func (s *Scanner) cleanAlbums(st *State) error {
start := time.Now()
defer func() { log.Printf("finished clean albums in %s, %d removed", durSince(start), st.AlbumsMissing()) }()
var all []int
err := s.db.
Model(&db.Album{}).
Pluck("id", &all).
Error
if err != nil {
return fmt.Errorf("plucking ids: %w", err)
}
for _, a := range all {
if _, ok := st.seenAlbums[a]; !ok {
st.albumsMissing = append(st.albumsMissing, int64(a))
}
}
return s.db.TransactionChunked(st.albumsMissing, func(tx *db.DB, chunk []int64) error {
return tx.Where(chunk).Delete(&db.Album{}).Error
})
}
func (s *Scanner) cleanArtists(st *State) error {
start := time.Now()
defer func() { log.Printf("finished clean artists in %s, %d removed", durSince(start), st.ArtistsMissing()) }()
// gorm doesn't seem to support subqueries without parens for UNION
q := s.db.Exec(`
DELETE FROM artists
WHERE id NOT IN (
SELECT artist_id FROM track_artists
UNION
SELECT artist_id FROM album_artists
UNION
SELECT artist_id FROM artist_appearances
)
`)
if err := q.Error; err != nil {
return err
}
st.artistsMissing = int(q.RowsAffected)
return nil
}
func (s *Scanner) cleanGenres(st *State) error { //nolint:unparam
start := time.Now()
defer func() { log.Printf("finished clean genres in %s, %d removed", durSince(start), st.GenresMissing()) }()
subTrack := s.db.
Select("genres.id").
Model(&db.Genre{}).
Joins("LEFT JOIN track_genres ON track_genres.genre_id=genres.id").
Where("track_genres.genre_id IS NULL").
SubQuery()
subAlbum := s.db.
Select("genres.id").
Model(&db.Genre{}).
Joins("LEFT JOIN album_genres ON album_genres.genre_id=genres.id").
Where("album_genres.genre_id IS NULL").
SubQuery()
q := s.db.
Where("genres.id IN ? AND genres.id IN ?", subTrack, subAlbum).
Delete(&db.Genre{})
st.genresMissing = int(q.RowsAffected)
return nil
}
//nolint:gochecknoglobals
var coverNames = map[string]struct{}{}
//nolint:gochecknoinits
func init() {
for _, name := range []string{"cover", "folder", "front", "albumart", "album", "artist"} {
for _, ext := range []string{"jpg", "jpeg", "png", "bmp", "gif"} {
coverNames[fmt.Sprintf("%s.%s", name, ext)] = struct{}{}
for i := 0; i < 3; i++ {
coverNames[fmt.Sprintf("%s.%d.%s", name, i, ext)] = struct{}{} // support beets extras
}
}
}
}
func isCover(name string) bool {
_, ok := coverNames[strings.ToLower(name)]
return ok
}
// decoded converts a string to it's latin equivalent.
// it will be used by the model's *UDec fields, and is only set if it
// differs from the original. the fields are used for searching.
func decoded(in string) string {
if u := unidecode.Unidecode(in); u != in {
return u
}
return ""
}
func durSince(t time.Time) time.Duration {
return time.Since(t).Truncate(10 * time.Microsecond)
}
type State struct {
errs []error
isFull bool
seenTracks map[int]struct{}
seenAlbums map[int]struct{}
seenTracksNew int
tracksMissing []int64
albumsMissing []int64
artistsMissing int
genresMissing int
}
func (s *State) SeenTracks() int { return len(s.seenTracks) }
func (s *State) SeenAlbums() int { return len(s.seenAlbums) }
func (s *State) SeenTracksNew() int { return s.seenTracksNew }
func (s *State) TracksMissing() int { return len(s.tracksMissing) }
func (s *State) AlbumsMissing() int { return len(s.albumsMissing) }
func (s *State) ArtistsMissing() int { return s.artistsMissing }
func (s *State) GenresMissing() int { return s.genresMissing }
type MultiValueMode uint8
const (
None MultiValueMode = iota
Delim
Multi
)
type Tag uint8
const (
Genre Tag = iota
Artist
AlbumArtist
)
type MultiValueSetting struct {
Mode MultiValueMode
Delim string
}
func ParseMulti(setting MultiValueSetting, values []string, value string) []string {
var parts []string
switch setting.Mode {
case Multi:
parts = values
case Delim:
parts = strings.Split(value, setting.Delim)
default:
parts = []string{value}
}
for i := range parts {
parts[i] = strings.TrimSpace(parts[i])
}
parts = slices.DeleteFunc(parts, func(s string) bool {
return s == ""
})
return parts
}
func musicDirRelative(musicDirs []string, absPath string) (musicDir, relPath string) {
for _, musicDir := range musicDirs {
if fileutil.HasPrefix(absPath, musicDir) {
relPath, _ = filepath.Rel(musicDir, absPath)
return musicDir, relPath
}
}
return
}
func symWalk(absPath string, fn fs.WalkDirFunc) error {
eval, _ := filepath.EvalSymlinks(absPath)
return filepath.WalkDir(eval, func(subAbs string, d fs.DirEntry, err error) error {
subAbs = strings.Replace(subAbs, eval, absPath, 1)
return fn(subAbs, d, err)
})
}