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