Optimize refresh events for scrobble endpoint

server/events/events.go

@@ -53,6 +53,9 @@ func (rr *RefreshResource) With(resource string, ids ...string) *RefreshResource
 	if rr.resources == nil {
 		rr.resources = make(map[string][]string)
 	}
+	if len(ids) == 0 {
+		rr.resources[resource] = append(rr.resources[resource], Any)
+	}
 	for i := range ids {
 		rr.resources[resource] = append(rr.resources[resource], ids[i])
 	}

server/events/events_test.go

@@ -37,8 +37,8 @@ var _ = Describe("Events", func() {
 			data := rr.Data(rr)
 			Expect(data).To(Equal(`{"album":["al-1","al-2","al-3"],"artist":["ar-1","ar-2"],"song":["sg-1","sg-2"]}`))
 		})
-		It("should send a * for when Any is used as id", func() {
-			rr.With("album", Any)
+		It("should send a * when no ids are specified", func() {
+			rr.With("album")
 			data := rr.Data(rr)
 			Expect(data).To(Equal(`{"album":["*"]}`))
 		})

server/subsonic/media_annotation.go

@@ -127,6 +127,9 @@ func (c *MediaAnnotationController) Scrobble(w http.ResponseWriter, r *http.Requ
 	playerId := 1 // TODO Multiple players, based on playerName/username/clientIP(?)
 	playerName := utils.ParamString(r, "c")
 	username := utils.ParamString(r, "u")
+	ctx := r.Context()
+	event := &events.RefreshResource{}
+	submissions := 0
 
 	log.Debug(r, "Scrobbling tracks", "ids", ids, "times", times, "submission", submission)
 	for i, id := range ids {
@@ -137,19 +140,24 @@ func (c *MediaAnnotationController) Scrobble(w http.ResponseWriter, r *http.Requ
 			t = time.Now()
 		}
 		if submission {
-			_, err := c.scrobblerRegister(r.Context(), playerId, id, t)
+			mf, err := c.scrobblerRegister(ctx, playerId, id, t)
 			if err != nil {
 				log.Error(r, "Error scrobbling track", "id", id, err)
 				continue
 			}
+			submissions++
+			event.With("song", mf.ID).With("album", mf.AlbumID).With("artist", mf.AlbumArtistID)
 		} else {
-			_, err := c.scrobblerNowPlaying(r.Context(), playerId, playerName, id, username)
+			_, err := c.scrobblerNowPlaying(ctx, playerId, playerName, id, username)
 			if err != nil {
 				log.Error(r, "Error setting current song", "id", id, err)
 				continue
 			}
 		}
 	}
+	if submissions > 0 {
+		c.broker.SendMessage(ctx, event)
+	}
 	return newResponse(), nil
 }
 
@@ -177,7 +185,6 @@ func (c *MediaAnnotationController) scrobblerRegister(ctx context.Context, playe
 	if err != nil {
 		log.Error("Error while scrobbling", "trackId", trackId, "user", username, err)
 	} else {
-		c.broker.SendMessage(ctx, &events.RefreshResource{})
 		log.Info("Scrobbled", "title", mf.Title, "artist", mf.Artist, "user", username)
 	}