Use ExtendTrackMetadata also for LB API loves export

internal/backends/listenbrainz/listenbrainz.go

@@ -32,6 +32,8 @@ import (
 	"go.uploadedlobster.com/scotty/internal/version"
 )
 
+const lovesBatchSize = listenbrainz.MaxItemsPerGet
+
 type ListenBrainzApiBackend struct {
 	client          listenbrainz.Client
 	mbClient        musicbrainzws2.Client
@@ -229,7 +231,8 @@ func (b *ListenBrainzApiBackend) ExportLoves(ctx context.Context, oldestTimestam
 func (b *ListenBrainzApiBackend) exportLoves(ctx context.Context, oldestTimestamp time.Time, results chan models.LovesResult) {
 	offset := 0
 	defer close(results)
-	loves := make(models.LovesList, 0, 2*listenbrainz.MaxItemsPerGet)
+	allLoves := make(models.LovesList, 0, 2*listenbrainz.MaxItemsPerGet)
+	batch := make([]listenbrainz.Feedback, 0, lovesBatchSize)
 
 out:
 	for {
@@ -245,31 +248,45 @@ out:
 		}
 
 		for _, feedback := range result.Feedback {
-			// Missing track metadata indicates that the recording MBID is no
+			if time.Unix(feedback.Created, 0).After(oldestTimestamp) {
-			// longer available and might have been merged. Try fetching details
+				batch = append(batch, feedback)
-			// from MusicBrainz.
-			if feedback.TrackMetadata == nil {
-				track, err := LookupRecording(ctx, &b.mbClient, feedback.RecordingMBID)
-				if err == nil {
-					feedback.TrackMetadata = track
-				}
-			}
-
-			love := AsLove(feedback)
-			if love.Created.After(oldestTimestamp) {
-				loves = append(loves, love)
 			} else {
 				break out
 			}
+
+			if len(batch) >= lovesBatchSize {
+				// Missing track metadata indicates that the recording MBID is no
+				// longer available and might have been merged. Try fetching details
+				// from MusicBrainz.
+				lovesBatch, err := ExtendTrackMetadata(ctx, &b.client, &b.mbClient, &batch)
+				if err != nil {
+					results <- models.LovesResult{Error: err}
+					return
+				}
+
+				for _, l := range lovesBatch {
+					allLoves = append(allLoves, l)
+				}
+			}
 		}
 
 		offset += listenbrainz.MaxItemsPerGet
 	}
 
-	sort.Sort(loves)
+	lovesBatch, err := ExtendTrackMetadata(ctx, &b.client, &b.mbClient, &batch)
+	if err != nil {
+		results <- models.LovesResult{Error: err}
+		return
+	}
+
+	for _, l := range lovesBatch {
+		allLoves = append(allLoves, l)
+	}
+
+	sort.Sort(allLoves)
 	results <- models.LovesResult{
-		Total: len(loves),
+		Total: len(allLoves),
-		Items: loves,
+		Items: allLoves,
 	}
 }