request throttling only for media group api

server/subsonic/api.go

@@ -4,7 +4,11 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
+	"github.com/deluan/navidrome/consts"
+	"github.com/go-chi/chi/middleware"
+	"math"
 	"net/http"
+	"runtime"
 
 	"github.com/deluan/navidrome/engine"
 	"github.com/deluan/navidrome/log"
@@ -116,8 +120,11 @@ func (api *Router) routes() http.Handler {
 	})
 	r.Group(func(r chi.Router) {
 		c := initMediaRetrievalController(api)
-		H(r, "getAvatar", c.GetAvatar)
-		H(r, "getCoverArt", c.GetCoverArt)
+		// configure request throttling
+		maxRequests := math.Max(2, float64(runtime.NumCPU()))
+		withThrottle := r.With(middleware.ThrottleBacklog(int(maxRequests), consts.RequestThrottleBacklogLimit, consts.RequestThrottleBacklogTimeout))
+		H(withThrottle, "getAvatar", c.GetAvatar)
+		H(withThrottle, "getCoverArt", c.GetCoverArt)
 	})
 	r.Group(func(r chi.Router) {
 		c := initStreamController(api)