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feat(subsonic): cache and use lastfm responses for covers, bios, top …
…songs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| //nolint:revive | ||
| package artistinfocache | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "log" | ||
| "time" | ||
|
|
||
| "github.com/jinzhu/gorm" | ||
| "go.senan.xyz/gonic/db" | ||
| "go.senan.xyz/gonic/scrobble/lastfm" | ||
| ) | ||
|
|
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| const keepFor = 30 * time.Hour * 24 | ||
|
|
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| type ArtistInfoCache struct { | ||
| db *db.DB | ||
| lastfmClient *lastfm.Client | ||
| } | ||
|
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| func New(db *db.DB, lastfmClient *lastfm.Client) *ArtistInfoCache { | ||
| return &ArtistInfoCache{db: db, lastfmClient: lastfmClient} | ||
| } | ||
|
|
||
| func (a *ArtistInfoCache) GetOrLookup(ctx context.Context, apiKey string, artistID int) (*db.ArtistInfo, error) { | ||
| var artist db.Artist | ||
| if err := a.db.Find(&artist, "id=?", artistID).Error; err != nil { | ||
| return nil, fmt.Errorf("find artist in db: %w", err) | ||
| } | ||
|
|
||
| var artistInfo db.ArtistInfo | ||
| if err := a.db.Find(&artistInfo, "id=?", artistID).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) { | ||
| return nil, fmt.Errorf("find artist info in db: %w", err) | ||
| } | ||
|
|
||
| if artistInfo.ID == 0 || artistInfo.Biography == "" /* prev not found maybe */ || time.Since(artistInfo.UpdatedAt) > keepFor { | ||
| return a.Lookup(ctx, apiKey, &artist) | ||
| } | ||
|
|
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| return &artistInfo, nil | ||
| } | ||
|
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| func (a *ArtistInfoCache) Get(ctx context.Context, artistID int) (*db.ArtistInfo, error) { | ||
| var artistInfo db.ArtistInfo | ||
| if err := a.db.Find(&artistInfo, "id=?", artistID).Error; err != nil { | ||
| return nil, fmt.Errorf("find artist info in db: %w", err) | ||
| } | ||
| return &artistInfo, nil | ||
| } | ||
|
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| func (a *ArtistInfoCache) Lookup(ctx context.Context, apiKey string, artist *db.Artist) (*db.ArtistInfo, error) { | ||
| var artistInfo db.ArtistInfo | ||
| artistInfo.ID = artist.ID | ||
|
|
||
| if err := a.db.FirstOrCreate(&artistInfo, "id=?", artistInfo.ID).Error; err != nil { | ||
| return nil, fmt.Errorf("first or create artist info: %w", err) | ||
| } | ||
|
|
||
| info, err := a.lastfmClient.ArtistGetInfo(apiKey, artist.Name) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("get upstream info: %w", err) | ||
| } | ||
|
|
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| artistInfo.ID = artist.ID | ||
| artistInfo.Biography = info.Bio.Summary | ||
| artistInfo.MusicBrainzID = info.MBID | ||
| artistInfo.LastFMURL = info.URL | ||
|
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||
| var similar []string | ||
| for _, sim := range info.Similar.Artists { | ||
| similar = append(similar, sim.Name) | ||
| } | ||
| artistInfo.SetSimilarArtists(similar) | ||
|
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| url, _ := a.lastfmClient.StealArtistImage(info.URL) | ||
| artistInfo.ImageURL = url | ||
|
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| topTracksResponse, err := a.lastfmClient.ArtistGetTopTracks(apiKey, artist.Name) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("get top tracks: %w", err) | ||
| } | ||
| var topTracks []string | ||
| for _, tr := range topTracksResponse.Tracks { | ||
| topTracks = append(topTracks, tr.Name) | ||
| } | ||
| artistInfo.SetTopTracks(topTracks) | ||
|
|
||
| if err := a.db.Save(&artistInfo).Error; err != nil { | ||
| return nil, fmt.Errorf("save upstream info: %w", err) | ||
| } | ||
|
|
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| return &artistInfo, nil | ||
| } | ||
|
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| func (a *ArtistInfoCache) Refresh(apiKey string, interval time.Duration) error { | ||
| ticker := time.NewTicker(interval) | ||
| for range ticker.C { | ||
| q := a.db. | ||
| Where("artist_infos.id IS NULL OR artist_infos.updated_at<?", time.Now().Add(-keepFor)). | ||
| Joins("LEFT JOIN artist_infos ON artist_infos.id=artists.id") | ||
|
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| var artist db.Artist | ||
| if err := q.Find(&artist).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) { | ||
| log.Printf("error finding non cached artist: %v", err) | ||
| continue | ||
| } | ||
| if artist.ID == 0 { | ||
| continue | ||
| } | ||
|
|
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| if _, err := a.Lookup(context.Background(), apiKey, &artist); err != nil { | ||
| log.Printf("error looking up non cached artist %s: %v", artist.Name, err) | ||
| continue | ||
| } | ||
|
|
||
| log.Printf("cached artist info for %q", artist.Name) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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