Use a RWMutex instead of an AtomicBool, to reduce contention

core/file_caches.go

@@ -5,12 +5,12 @@ import (
 	"fmt"
 	"io"
 	"path/filepath"
+	"sync"
 	"time"
 
 	"github.com/deluan/navidrome/conf"
 	"github.com/deluan/navidrome/consts"
 	"github.com/deluan/navidrome/log"
-	"github.com/deluan/navidrome/utils"
 	"github.com/djherbis/fscache"
 	"github.com/dustin/go-humanize"
 )
@@ -29,17 +29,21 @@ func NewFileCache(name, cacheSize, cacheFolder string, maxItems int, getReader R
 		cacheFolder: cacheFolder,
 		maxItems:    maxItems,
 		getReader:   getReader,
-		disabled:    utils.AtomicBool{},
-		ready:       utils.AtomicBool{},
+		mutex:       &sync.RWMutex{},
 	}
 
 	go func() {
 		cache, err := newFSCache(fc.name, fc.cacheSize, fc.cacheFolder, fc.maxItems)
+		fc.mutex.Lock()
+		defer fc.mutex.Unlock()
 		if err == nil {
 			fc.cache = cache
-			fc.disabled.Set(cache == nil)
+			fc.disabled = cache == nil
+		}
+		fc.ready = true
+		if fc.disabled {
+			log.Debug("Cache disabled", "cache", fc.name, "size", fc.cacheSize)
 		}
-		fc.ready.Set(true)
 	}()
 
 	return fc
@@ -52,18 +56,30 @@ type fileCache struct {
 	maxItems    int
 	cache       fscache.Cache
 	getReader   ReadFunc
-	disabled    utils.AtomicBool
-	ready       utils.AtomicBool
+	disabled    bool
+	ready       bool
+	mutex       *sync.RWMutex
+}
+
+func (fc *fileCache) Ready() bool {
+	fc.mutex.RLock()
+	defer fc.mutex.RUnlock()
+	return fc.ready
+}
+
+func (fc *fileCache) available(ctx context.Context) bool {
+	fc.mutex.RLock()
+	defer fc.mutex.RUnlock()
+
+	if !fc.ready {
+		log.Debug(ctx, "Cache not initialized yet", "cache", fc.name)
+	}
+
+	return fc.ready && !fc.disabled
 }
 
 func (fc *fileCache) Get(ctx context.Context, arg fmt.Stringer) (*CachedStream, error) {
-	if !fc.Ready() {
-		log.Debug(ctx, "Cache not initialized yet", "cache", fc.name)
-	}
-	if fc.disabled.Get() {
-		log.Debug(ctx, "Cache disabled", "cache", fc.name)
-	}
-	if fc.disabled.Get() || !fc.Ready() {
+	if !fc.available(ctx) {
 		reader, err := fc.getReader(ctx, arg)
 		if err != nil {
 			return nil, err
@@ -108,10 +124,6 @@ func (fc *fileCache) Get(ctx context.Context, arg fmt.Stringer) (*CachedStream,
 	return &CachedStream{Reader: r, Cached: cached}, nil
 }
 
-func (fc *fileCache) Ready() bool {
-	return fc.ready.Get()
-}
-
 type CachedStream struct {
 	io.Reader
 	io.Seeker

core/file_caches_test.go

@@ -40,13 +40,13 @@ var _ = Describe("File Caches", func() {
 		It("creates the cache folder with invalid size", func() {
 			fc := callNewFileCache("test", "abc", "test", 0, nil)
 			Expect(fc.cache).ToNot(BeNil())
-			Expect(fc.disabled.Get()).To(BeFalse())
+			Expect(fc.disabled).To(BeFalse())
 		})
 
 		It("returns empty if cache size is '0'", func() {
 			fc := callNewFileCache("test", "0", "test", 0, nil)
 			Expect(fc.cache).To(BeNil())
-			Expect(fc.disabled.Get()).To(BeTrue())
+			Expect(fc.disabled).To(BeTrue())
 		})
 	})
 

core/media_streamer.go

@@ -70,8 +70,7 @@ func (ms *mediaStreamer) NewStream(ctx context.Context, id string, reqFormat str
 		if err != nil {
 			return nil, err
 		}
-		s.Reader = f
-		s.Closer = f
+		s.ReadCloser = f
 		s.Seeker = f
 		s.format = mf.Suffix
 		return s, nil
@@ -93,10 +92,9 @@ func (ms *mediaStreamer) NewStream(ctx context.Context, id string, reqFormat str
 	log.Debug(ctx, "Streaming TRANSCODED file", "id", mf.ID, "path", mf.Path,
 		"requestBitrate", reqBitRate, "requestFormat", reqFormat,
 		"originalBitrate", mf.BitRate, "originalFormat", mf.Suffix,
-		"selectedBitrate", bitRate, "selectedFormat", format, "cached", cached)
+		"selectedBitrate", bitRate, "selectedFormat", format, "cached", cached, "seekable", s.Seekable())
 
-	s.Reader = r
-	s.Closer = r
+	s.ReadCloser = r
 	if r.Seekable() {
 		s.Seeker = r
 	}
@@ -109,8 +107,7 @@ type Stream struct {
 	mf      *model.MediaFile
 	bitRate int
 	format  string
-	io.Reader
-	io.Closer
+	io.ReadCloser
 	io.Seeker
 }
 

server/subsonic/stream.go

@@ -32,8 +32,10 @@ func (c *StreamController) Stream(w http.ResponseWriter, r *http.Request) (*resp
 	if err != nil {
 		return nil, err
 	}
+
+	// Make sure the stream will be closed at the end, to avoid leakage
 	defer func() {
-		if err := stream.Close(); err != nil {
+		if err := stream.Close(); err != nil && log.CurrentLevel() >= log.LevelDebug {
 			log.Error("Error closing stream", "id", id, "file", stream.Name(), err)
 		}
 	}()