fix: panic due to closed channel

waku/v2/api/filter.go

@@ -75,6 +75,7 @@ func (apiSub *Sub) waitOnSubClose() {
 		case subId := <-apiSub.closing:
 			//trigger closing and resubscribe flow for subscription.
 			apiSub.closeAndResubscribe(subId)
+
 		}
 	}
 }
@@ -89,13 +90,9 @@ func (apiSub *Sub) closeAndResubscribe(subId string) {
 }
 
 func (apiSub *Sub) cleanup() {
-	apiSub.log.Debug("ENTER cleanup()")
-	defer func() {
-		apiSub.log.Debug("EXIT cleanup()")
-	}()
+	apiSub.log.Debug("Cleaning up subscription", zap.Stringer("config", apiSub.Config))
 
 	for _, s := range apiSub.subs {
-		close(s.Closing)
 		_, err := apiSub.wf.UnsubscribeWithSubscription(apiSub.ctx, s)
 		if err != nil {
 			//Logging with info as this is part of cleanup
@@ -168,10 +165,14 @@ func (apiSub *Sub) multiplex(subs []*subscription.SubscriptionDetails) {
 			}
 		}(subDetails)
 		go func(subDetails *subscription.SubscriptionDetails) {
-			<-subDetails.Closing
-			apiSub.log.Debug("sub closing", zap.String("subID", subDetails.ID))
+			select {
+			case <-apiSub.ctx.Done():
+				return
+			case <-subDetails.Closing:
+				apiSub.log.Debug("sub closing", zap.String("subID", subDetails.ID))
 
-			apiSub.closing <- subDetails.ID
+				apiSub.closing <- subDetails.ID
+			}
 		}(subDetails)
 	}
 }

waku/v2/protocol/filter/client.go

@@ -88,7 +88,7 @@ func NewWakuFilterLightNode(broadcaster relay.Broadcaster, pm *peermanager.PeerM
 	wf.pm = pm
 	wf.CommonService = service.NewCommonService()
 	wf.metrics = newMetrics(reg)
-	wf.peerPingInterval = 5 * time.Second
+	wf.peerPingInterval = 1 * time.Minute
 	return wf
 }
 

waku/v2/protocol/filter/filter_health_check.go

@@ -26,9 +26,8 @@ func (wf *WakuFilterLightNode) PingPeer(peer peer.ID) {
 		subscriptions := wf.subscriptions.GetAllSubscriptionsForPeer(peer)
 		for _, subscription := range subscriptions {
 			wf.log.Debug("Notifying sub closing", zap.String("subID", subscription.ID))
-
 			//Indicating that subscription is closing,
-			close(subscription.Closing)
+			subscription.SetClosing()
 		}
 	}
 }

waku/v2/protocol/subscription/subscription_details.go

@@ -29,7 +29,7 @@ type SubscriptionDetails struct {
 	mapRef  *SubscriptionsMap
 	Closed  bool `json:"-"`
 	once    sync.Once
-	Closing chan struct{}
+	Closing chan bool
 
 	PeerID        peer.ID                 `json:"peerID"`
 	ContentFilter protocol.ContentFilter  `json:"contentFilters"`
@@ -99,6 +99,7 @@ func (s *SubscriptionDetails) CloseC() {
 		defer s.Unlock()
 		s.Closed = true
 		close(s.C)
+		close(s.Closing)
 	})
 }
 
@@ -107,6 +108,14 @@ func (s *SubscriptionDetails) Close() error {
 	return s.mapRef.Delete(s)
 }
 
+func (s *SubscriptionDetails) SetClosing() {
+	s.Lock()
+	defer s.Unlock()
+	if !s.Closed {
+		s.Closing <- true
+	}
+}
+
 func (s *SubscriptionDetails) MarshalJSON() ([]byte, error) {
 	result := struct {
 		PeerID        peer.ID  `json:"peerID"`

waku/v2/protocol/subscription/subscriptions_map.go

@@ -75,7 +75,7 @@ func (sub *SubscriptionsMap) NewSubscription(peerID peer.ID, cf protocol.Content
 		PeerID:        peerID,
 		C:             make(chan *protocol.Envelope, 1024),
 		ContentFilter: protocol.ContentFilter{PubsubTopic: cf.PubsubTopic, ContentTopics: maps.Clone(cf.ContentTopics)},
-		Closing:       make(chan struct{}),
+		Closing:       make(chan bool),
 	}
 
 	// Increase the number of subscriptions for this (pubsubTopic, contentTopic) pair
@@ -147,6 +147,11 @@ func (sub *SubscriptionsMap) Delete(subscription *SubscriptionDetails) error {
 		sub.decreaseSubFor(contentFilter.PubsubTopic, contentTopic)
 	}
 
+	if len(peerSubscription.SubsPerPubsubTopic) == 0 {
+		sub.logger.Debug("no more subs for peer", zap.Stringer("id", subscription.PeerID))
+		delete(sub.items, subscription.PeerID)
+	}
+
 	return nil
 }