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library.go
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library.go
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// Package library is responsible for orchestrating actions related to
// providing a navigable representation of the audio library.
package library
import (
"sort"
"strconv"
"strings"
"sync"
"time"
"unicode"
"github.com/boreq/eggplant/adapters/music/scanner"
"github.com/boreq/eggplant/adapters/music/store"
"github.com/boreq/eggplant/application/music"
"github.com/boreq/eggplant/logging"
"github.com/boreq/errors"
)
const rootAlbumTitle = "Eggplant"
type TrackStore interface {
SetItems(items []store.Item)
GetDuration(id string) time.Duration
}
type ThumbnailStore interface {
SetItems(items []store.Item)
}
type AccessLoader interface {
Load(file string) (music.Access, error)
}
type IdGenerator interface {
AlbumId(parents []music.AlbumId, title string) (music.AlbumId, error)
TrackId(parents []music.AlbumId, title string) (music.TrackId, error)
FileId(path string) (music.FileId, error)
}
// Library receives scanner updates, dispatches them to appropriate stores and
// builds a navigable representation of the music collection.
type Library struct {
trackStore TrackStore
thumbnailStore ThumbnailStore
accessLoader AccessLoader
idGenerator IdGenerator
root *album
mutex sync.Mutex
log logging.Logger
}
// New creates a library which receives updates from the specified channel.
func New(
ch <-chan scanner.Album,
trackStore TrackStore,
thumbnailStore ThumbnailStore,
accessLoader AccessLoader,
idGenerator IdGenerator,
) (*Library, error) {
l := &Library{
trackStore: trackStore,
thumbnailStore: thumbnailStore,
accessLoader: accessLoader,
idGenerator: idGenerator,
root: newAlbum(rootAlbumTitle),
log: logging.New("library"),
}
go l.receiveUpdates(ch)
return l, nil
}
// Browse lists the specified album. Provide a zero-length slice to list the
// root album.
func (l *Library) Browse(ids []music.AlbumId, publicOnly bool) (music.Album, error) {
l.mutex.Lock()
defer l.mutex.Unlock()
album, err := l.getAlbum(ids)
if err != nil {
return music.Album{}, errors.Wrap(err, "failed to get an album")
}
access, err := l.getAccess(ids)
if err != nil {
return music.Album{}, errors.Wrap(err, "failed to get access")
}
parents, err := l.getParents(ids)
if err != nil {
return music.Album{}, errors.Wrap(err, "failed to get parents")
}
listed := music.Album{
Title: album.title,
Parents: parents,
Access: access,
}
if len(ids) > 0 {
listed.Id = ids[len(ids)-1]
}
if album.thumbnailId != "" {
listed.Thumbnail = &music.Thumbnail{
FileId: album.thumbnailId,
}
}
for id, album := range album.albums {
access, err := l.getAccess(append(ids, id))
if err != nil {
return music.Album{}, errors.Wrap(err, "failed to get access")
}
if !canAccess(access, publicOnly) {
continue
}
d := music.Album{
Id: id,
Title: album.title,
Access: access,
}
if album.thumbnailId != "" {
d.Thumbnail = &music.Thumbnail{
FileId: album.thumbnailId,
}
}
listed.Albums = append(listed.Albums, d)
}
sortAlbums(listed.Albums)
if canAccess(access, publicOnly) {
for id, track := range album.tracks {
t := music.Track{
Id: id,
FileId: track.fileId,
Title: track.title,
Duration: l.trackStore.GetDuration(track.fileId.String()).Seconds(),
}
listed.Tracks = append(listed.Tracks, t)
}
SortTracks(listed.Tracks)
}
return listed, nil
}
const maxSearchItems = 10
func (l *Library) Search(query string, publicOnly bool) (music.SearchResult, error) {
l.mutex.Lock()
defer l.mutex.Unlock()
var result music.SearchResult
if err := l.walk(
func(parent *music.BasicAlbum, id music.AlbumId, v album) error {
if len(result.Albums) > maxSearchItems {
return nil
}
if !containsStringCaseInsensitive(v.title, query) {
return nil
}
var path []music.AlbumId
if parent != nil {
path = append(path, parent.Path...)
}
path = append(path, id)
result.Albums = append(
result.Albums,
newBasicAlbum(path, v),
)
return nil
},
func(parents music.BasicAlbum, id music.TrackId, v track) error {
if len(result.Tracks) > maxSearchItems {
return nil
}
if !containsStringCaseInsensitive(v.title, query) {
return nil
}
result.Tracks = append(
result.Tracks,
l.toSearchResultTrack(parents, id, v),
)
return nil
},
publicOnly,
); err != nil {
return music.SearchResult{}, errors.Wrap(err, "walk failed")
}
return result, nil
}
func (l *Library) toSearchResultTrack(album music.BasicAlbum, id music.TrackId, v track) music.SearchResultTrack {
return music.SearchResultTrack{
Track: music.Track{
Id: id,
FileId: v.fileId,
Title: v.title,
Duration: l.trackStore.GetDuration(v.fileId.String()).Seconds(),
},
Album: album,
}
}
func (l *Library) getParents(ids []music.AlbumId) ([]music.Album, error) {
parents := make([]music.Album, 0)
for i := 0; i < len(ids); i++ {
parentIds := ids[:i+1]
dir, err := l.getAlbum(parentIds)
if err != nil {
return nil, errors.Wrap(err, "failed to get a parent album")
}
parent := music.Album{
Id: parentIds[len(parentIds)-1],
Title: dir.title,
}
parents = append(parents, parent)
}
return parents, nil
}
var defaultAccess = music.Access{
Public: false,
}
func (l *Library) getAccess(ids []music.AlbumId) (music.Access, error) {
for i := len(ids); i >= 0; i-- {
parentIds := ids[:i]
album, err := l.getAlbum(parentIds)
if err != nil {
return music.Access{}, errors.Wrap(err, "failed to get a parent album")
}
if album.access != nil {
return *album.access, nil
}
}
return defaultAccess, nil
}
func (l *Library) receiveUpdates(ch <-chan scanner.Album) {
for album := range ch {
if err := l.handleUpdate(album); err != nil {
l.log.Error("could not handle a scanner update", "err", err)
}
}
}
func (l *Library) handleUpdate(album scanner.Album) error {
l.mutex.Lock()
defer l.mutex.Unlock()
// update the track list
l.root = newAlbum(rootAlbumTitle)
if err := l.mergeAlbum(nil, l.root, album); err != nil {
return errors.Wrap(err, "merge album failed")
}
// inform track store which files are available for conversion
var tracks []store.Item
if err := l.getTracks(&tracks, l.root); err != nil {
return errors.Wrap(err, "preparing tracks failed")
}
l.trackStore.SetItems(tracks)
// inform thumbnail store which files are available for conversion
var thumbnails []store.Item
if err := l.getThumbnails(&thumbnails, l.root); err != nil {
return errors.Wrap(err, "preparing thumbnails failed")
}
l.thumbnailStore.SetItems(thumbnails)
return nil
}
func (l *Library) mergeAlbum(parents []music.AlbumId, target *album, album scanner.Album) error {
if album.Thumbnail != "" {
thumbnailId, err := l.idGenerator.FileId(album.Thumbnail)
if err != nil {
return errors.Wrap(err, "could not create a thumbnail id")
}
target.thumbnailPath = album.Thumbnail
target.thumbnailId = thumbnailId
}
if album.AccessFile != "" {
acc, err := l.accessLoader.Load(album.AccessFile)
if err != nil {
return errors.Wrap(err, "could not load the access file")
}
target.access = &acc
}
for title, scannerTrack := range album.Tracks {
id, track, err := l.toTrack(parents, title, scannerTrack)
if err != nil {
return errors.Wrap(err, "could not convert to a track")
}
target.tracks[id] = track
}
for title, scannerAlbum := range album.Albums {
id, album, err := l.toAlbum(parents, title, *scannerAlbum)
if err != nil {
return errors.Wrap(err, "could not convert to an album")
}
target.albums[id] = album
childParents := append(parents, id)
if err := l.mergeAlbum(childParents, album, *scannerAlbum); err != nil {
return err
}
}
return nil
}
func (l *Library) getThumbnails(thumbnails *[]store.Item, current *album) error {
if current.thumbnailPath != "" {
thumbnail := store.Item{
Id: current.thumbnailId.String(),
Path: current.thumbnailPath,
}
*thumbnails = append(*thumbnails, thumbnail)
}
for _, child := range current.albums {
if err := l.getThumbnails(thumbnails, child); err != nil {
return err
}
}
return nil
}
func (l *Library) getTracks(tracks *[]store.Item, current *album) error {
for _, track := range current.tracks {
track := store.Item{
Id: track.fileId.String(),
Path: track.path,
}
*tracks = append(*tracks, track)
}
for _, child := range current.albums {
if err := l.getTracks(tracks, child); err != nil {
return err
}
}
return nil
}
func (l *Library) getAlbum(ids []music.AlbumId) (*album, error) {
var current *album = l.root
for _, id := range ids {
child, ok := current.albums[id]
if !ok {
return nil, errors.Wrapf(music.ErrNotFound, "album '%s' not found", id)
}
current = child
}
return current, nil
}
func (l *Library) newTrack(title string, path string) (track, error) {
fileId, err := l.idGenerator.FileId(path)
if err != nil {
return track{}, errors.Wrap(err, "could not create a file id")
}
t := track{
title: title,
path: path,
fileId: fileId,
}
return t, nil
}
func (l *Library) toTrack(parents []music.AlbumId, title string, scannerTrack scanner.Track) (music.TrackId, track, error) {
id, err := l.idGenerator.TrackId(parents, title)
if err != nil {
return "", track{}, errors.Wrap(err, "could not create a track id")
}
t, err := l.newTrack(title, scannerTrack.Path)
if err != nil {
return "", track{}, errors.Wrap(err, "could not create a track")
}
return id, t, nil
}
func (l *Library) toAlbum(parents []music.AlbumId, title string, scannerAlbum scanner.Album) (music.AlbumId, *album, error) {
id, err := l.idGenerator.AlbumId(parents, title)
if err != nil {
return "", nil, errors.Wrap(err, "could not create an album id")
}
album := newAlbum(title)
return id, album, nil
}
func canAccess(access music.Access, publicOnly bool) bool {
if publicOnly && !access.Public {
return false
}
return true
}
type track struct {
title string
path string
fileId music.FileId
}
type album struct {
title string
thumbnailPath string
thumbnailId music.FileId
access *music.Access
albums map[music.AlbumId]*album
tracks map[music.TrackId]track
}
func newAlbum(title string) *album {
return &album{
title: title,
albums: make(map[music.AlbumId]*album),
tracks: make(map[music.TrackId]track),
}
}
func sortAlbums(albums []music.Album) {
sort.Slice(albums,
func(i, j int) bool {
return albums[i].Title < albums[j].Title
},
)
}
func SortTracks(tracks []music.Track) {
sort.Slice(tracks,
func(i, j int) bool {
fieldsI := strings.Fields(tracks[i].Title)
fieldsJ := strings.Fields(tracks[j].Title)
if len(fieldsI) > 0 && len(fieldsJ) > 0 {
f := func(r rune) bool {
return !unicode.IsNumber(r)
}
numI, errI := strconv.Atoi(strings.TrimFunc(fieldsI[0], f))
numJ, errJ := strconv.Atoi(strings.TrimFunc(fieldsJ[0], f))
if errI == nil && errJ == nil {
if numI == numJ {
return strings.Join(fieldsI[1:], "") < strings.Join(fieldsJ[1:], "")
}
return numI < numJ
}
}
return tracks[i].Title < tracks[j].Title
},
)
}
func containsStringCaseInsensitive(s, substr string) bool {
return strings.Contains(strings.ToLower(s), strings.ToLower(substr))
}