Make caches singletons

core/media_streamer.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"mime"
 	"os"
+	"sync"
 	"time"
 
 	"github.com/deluan/navidrome/conf"
@@ -167,21 +168,29 @@ func selectTranscodingOptions(ctx context.Context, ds model.DataStore, mf *model
 	return
 }
 
+var (
+	onceTranscodingCache sync.Once
+	transcodingCache     TranscodingCache
+)
+
 func NewTranscodingCache() TranscodingCache {
-	return cache.NewFileCache("Transcoding", conf.Server.TranscodingCacheSize,
-		consts.TranscodingCacheDir, consts.DefaultTranscodingCacheMaxItems,
-		func(ctx context.Context, arg cache.Item) (io.Reader, error) {
-			job := arg.(*streamJob)
-			t, err := job.ms.ds.Transcoding(ctx).FindByFormat(job.format)
-			if err != nil {
-				log.Error(ctx, "Error loading transcoding command", "format", job.format, err)
-				return nil, os.ErrInvalid
-			}
-			out, err := job.ms.ffm.Start(ctx, t.Command, job.mf.Path, job.bitRate)
-			if err != nil {
-				log.Error(ctx, "Error starting transcoder", "id", job.mf.ID, err)
-				return nil, os.ErrInvalid
-			}
-			return out, nil
-		})
+	onceTranscodingCache.Do(func() {
+		transcodingCache = cache.NewFileCache("Transcoding", conf.Server.TranscodingCacheSize,
+			consts.TranscodingCacheDir, consts.DefaultTranscodingCacheMaxItems,
+			func(ctx context.Context, arg cache.Item) (io.Reader, error) {
+				job := arg.(*streamJob)
+				t, err := job.ms.ds.Transcoding(ctx).FindByFormat(job.format)
+				if err != nil {
+					log.Error(ctx, "Error loading transcoding command", "format", job.format, err)
+					return nil, os.ErrInvalid
+				}
+				out, err := job.ms.ffm.Start(ctx, t.Command, job.mf.Path, job.bitRate)
+				if err != nil {
+					log.Error(ctx, "Error starting transcoder", "id", job.mf.ID, err)
+					return nil, os.ErrInvalid
+				}
+				return out, nil
+			})
+	})
+	return transcodingCache
 }