add HTTP retries for DLNA player

backend/app.go

@@ -153,16 +153,16 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 	}
 
 	// Periodically scan for remote players
+	go a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, 5 /*waitSec*/)
 	go func() {
 		t := time.NewTicker(5 * time.Minute)
 		for {
-			a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx)
 			select {
 			case <-a.bgrndCtx.Done():
 				t.Stop()
 				return
 			case <-t.C:
-				continue
+				a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, 10 /*waitSec*/)
 			}
 		}
 	}()

backend/playbackmanager.go

@@ -96,8 +96,8 @@ func (p *PlaybackManager) addOnTrackChangeHook() {
 	})
 }
 
-func (p *PlaybackManager) ScanRemotePlayers(ctx context.Context) {
-	devices, _ := device.SearchMediaRenderers(ctx, 10, services.AVTransport, services.RenderingControl)
+func (p *PlaybackManager) ScanRemotePlayers(ctx context.Context, waitSec int) {
+	devices, _ := device.SearchMediaRenderers(ctx, waitSec, services.AVTransport, services.RenderingControl)
 
 	var discovered []remotePlayer
 	for _, d := range devices {

backend/player/dlna/dlnaplayer.go

@@ -19,6 +19,7 @@ import (
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/backend/player"
 	"github.com/dweymouth/supersonic/backend/util"
+	"github.com/hashicorp/go-retryablehttp"
 	"github.com/supersonic-app/go-upnpcast/device"
 	"github.com/supersonic-app/go-upnpcast/services/avtransport"
 	"github.com/supersonic-app/go-upnpcast/services/renderingcontrol"
@@ -62,14 +63,20 @@ type DLNAPlayer struct {
 }
 
 func NewDLNAPlayer(device *device.MediaRenderer) (*DLNAPlayer, error) {
+	retry := retryablehttp.NewClient()
+	retry.RetryMax = 3
+	cli := retry.StandardClient()
+
 	avt, err := device.AVTransportClient()
 	if err != nil {
 		return nil, err
 	}
+	avt.HTTPClient = cli
 	rc, err := device.RenderingControlClient()
 	if err != nil {
 		return nil, err
 	}
+	rc.HTTPClient = cli
 	return &DLNAPlayer{
 		avTransport:   avt,
 		renderControl: rc,