Flush albums and artists after each folder added/updated/deleted

scanner/refresh_buffer.go

@@ -0,0 +1,59 @@
+package scanner
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/deluan/navidrome/log"
+	"github.com/deluan/navidrome/model"
+)
+
+type refreshBuffer struct {
+	ctx    context.Context
+	ds     model.DataStore
+	album  map[string]struct{}
+	artist map[string]struct{}
+}
+
+func newRefreshBuffer(ctx context.Context, ds model.DataStore) *refreshBuffer {
+	return &refreshBuffer{
+		ctx:   ctx,
+		ds:    ds,
+		album: map[string]struct{}{},
+	}
+}
+
+func (f *refreshBuffer) accumulate(mf model.MediaFile) {
+	f.album[mf.AlbumID] = struct{}{}
+	f.album[mf.AlbumArtistID] = struct{}{}
+}
+
+type refreshCallbackFunc = func(ids ...string) error
+
+func (f *refreshBuffer) flushMap(m map[string]struct{}, entity string, refresh refreshCallbackFunc) error {
+	if len(m) == 0 {
+		return nil
+	}
+	var ids []string
+	for id := range m {
+		ids = append(ids, id)
+		delete(m, id)
+	}
+	if err := refresh(ids...); err != nil {
+		log.Error(f.ctx, fmt.Sprintf("Error writing %ss to the DB", entity), err)
+		return err
+	}
+	return nil
+}
+
+func (f *refreshBuffer) flush() error {
+	err := f.flushMap(f.album, "album", f.ds.Album(f.ctx).Refresh)
+	if err != nil {
+		return err
+	}
+	err = f.flushMap(f.artist, "artist", f.ds.Artist(f.ctx).Refresh)
+	if err != nil {
+		return err
+	}
+	return nil
+}