Allow configuring cache folder (#2357)

* Set all clients to dev_download for make get-music

* Use multiple TranscodingCache instances in tests

This fixes flaky tests. The issue is that the TranscodingCache object
was being reused in tests from media_stream_Internal_test.go and
media_stream_test.go. If tests from the former was run first, the cache
would be filled up, so that when running tests from the latter, the `NON
seekable` test would fail.

* Allow configuring cache folder

This commit introduces a new configuration option to configure the cache
folder. This allows the cache to be in a separate folder such as
/var/cache/navidrome on Linux distributions.

* Fix tests

* Removed unused test setup code

---------

Co-authored-by: Deluan <deluan@deluan.com>
Co-authored-by: Deluan <deluan@navidrome.org>

core/media_streamer.go

@@ -184,22 +184,26 @@ var (
 
 func GetTranscodingCache() TranscodingCache {
 	onceTranscodingCache.Do(func() {
-		instanceTranscodingCache = 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.transcoder.Transcode(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
-			})
+		instanceTranscodingCache = NewTranscodingCache()
 	})
 	return instanceTranscodingCache
 }
+
+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.transcoder.Transcode(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
+		})
+}

core/media_streamer_Internal_test.go

@@ -2,10 +2,8 @@ package core
 
 import (
 	"context"
-	"os"
 
 	"github.com/navidrome/navidrome/conf"
-	"github.com/navidrome/navidrome/conf/configtest"
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/model/request"
@@ -16,21 +14,10 @@ import (
 
 var _ = Describe("MediaStreamer", func() {
 	var ds model.DataStore
-	ctx := log.NewContext(context.TODO())
+	ctx := log.NewContext(context.Background())
 
 	BeforeEach(func() {
-		DeferCleanup(configtest.SetupConfig())
-		conf.Server.DataFolder, _ = os.MkdirTemp("", "file_caches")
-		conf.Server.TranscodingCacheSize = "100MB"
 		ds = &tests.MockDataStore{MockedTranscoding: &tests.MockTranscodingRepo{}}
-		ds.MediaFile(ctx).(*tests.MockMediaFileRepo).SetData(model.MediaFiles{
-			{ID: "123", Path: "tests/fixtures/test.mp3", Suffix: "mp3", BitRate: 128, Duration: 257.0},
-		})
-		testCache := GetTranscodingCache()
-		Eventually(func() bool { return testCache.Available(context.TODO()) }).Should(BeTrue())
-	})
-	AfterEach(func() {
-		_ = os.RemoveAll(conf.Server.DataFolder)
 	})
 
 	Context("selectTranscodingOptions", func() {

core/media_streamer_test.go

@@ -23,18 +23,18 @@ var _ = Describe("MediaStreamer", func() {
 
 	BeforeEach(func() {
 		DeferCleanup(configtest.SetupConfig())
-		conf.Server.DataFolder, _ = os.MkdirTemp("", "file_caches")
+		conf.Server.CacheFolder, _ = os.MkdirTemp("", "file_caches")
 		conf.Server.TranscodingCacheSize = "100MB"
 		ds = &tests.MockDataStore{MockedTranscoding: &tests.MockTranscodingRepo{}}
 		ds.MediaFile(ctx).(*tests.MockMediaFileRepo).SetData(model.MediaFiles{
 			{ID: "123", Path: "tests/fixtures/test.mp3", Suffix: "mp3", BitRate: 128, Duration: 257.0},
 		})
-		testCache := core.GetTranscodingCache()
+		testCache := core.NewTranscodingCache()
 		Eventually(func() bool { return testCache.Available(context.TODO()) }).Should(BeTrue())
 		streamer = core.NewMediaStreamer(ds, ffmpeg, testCache)
 	})
 	AfterEach(func() {
-		_ = os.RemoveAll(conf.Server.DataFolder)
+		_ = os.RemoveAll(conf.Server.CacheFolder)
 	})
 
 	Context("NewStream", func() {