refactor: filter

- Create a channel when a subscription is created
- Add stop function for protocols

examples/filter2/main.go

@@ -84,14 +84,17 @@ func main() {
 	//
 
 	// Send FilterRequest from light node to full node
-	filterChan := make(filter.ContentFilterChan)
+	_, filterChan, err := lightNode.SubscribeFilter(ctx, string(pubSubTopic), []string{contentTopic})
+	if err != nil {
+		panic(err)
+	}
 
 	go func() {
 		for env := range filterChan {
 			log.Info("Light node received msg, ", string(env.Message().Payload))
 		}
+		log.Info("Message channel closed!")
 	}()
-	lightNode.SubscribeFilter(ctx, string(pubSubTopic), []string{contentTopic}, filterChan)
 
 	go writeLoop(ctx, fullNode)
 	go readLoop(ctx, fullNode)

tests/connection_test.go

@@ -40,7 +40,7 @@ func TestBasicSendingReceiving(t *testing.T) {
 
 	require.NoError(t, write(ctx, wakuNode, "test"))
 
-	sub, err := wakuNode.Subscribe(nil)
+	sub, err := wakuNode.Subscribe(ctx, nil)
 	require.NoError(t, err)
 
 	value := <-sub.C

waku/v2/node/subscription.go

@@ -18,8 +18,11 @@ type Subscription struct {
 
 // Unsubscribe will close a subscription from a pubsub topic. Will close the message channel
 func (subs *Subscription) Unsubscribe() {
+	subs.mutex.Lock()
+	defer subs.mutex.Unlock()
 	if !subs.closed {
 		close(subs.quit)
+		subs.closed = true
 	}
 }
 

waku/v2/node/wakunode2.go

@@ -46,6 +46,7 @@ type WakuNode struct {
 	lightPush  *lightpush.WakuLightPush
 	rendezvous *rendezvous.RendezvousService
 	ping       *ping.PingService
+	store      *store.WakuStore
 
 	subscriptions      map[relay.Topic][]*Subscription
 	subscriptionsMutex sync.Mutex
@@ -184,13 +185,30 @@ func (w *WakuNode) Stop() {
 		w.rendezvous.Stop()
 	}
 
+	if w.relay != nil {
 		for _, topic := range w.relay.Topics() {
 			for _, sub := range w.subscriptions[topic] {
 				sub.Unsubscribe()
 			}
 		}
-
 		w.subscriptions = nil
+	}
+
+	if w.filter != nil {
+		w.filter.Stop()
+		for _, filter := range w.filters {
+			close(filter.Chan)
+		}
+		w.filters = nil
+	}
+
+	if w.lightPush != nil {
+		w.lightPush.Stop()
+	}
+
+	if w.store != nil {
+		w.store.Stop()
+	}
 
 	w.host.Close()
 }
@@ -264,7 +282,8 @@ func (w *WakuNode) mountRendezvous() error {
 }
 
 func (w *WakuNode) startStore() {
-	w.opts.store.Start(w.ctx, w.host)
+	w.store = w.opts.store
+	w.store.Start(w.ctx, w.host)
 
 	if w.opts.shouldResume {
 		// TODO: extract this to a function and run it when you go offline
@@ -315,7 +334,7 @@ func (w *WakuNode) AddPeer(address ma.Multiaddr, protocolID p2pproto.ID) (*peer.
 }
 
 func (w *WakuNode) Query(ctx context.Context, contentTopics []string, startTime float64, endTime float64, opts ...store.HistoryRequestOption) (*pb.HistoryResponse, error) {
-	if w.opts.store == nil {
+	if w.store == nil {
 		return nil, errors.New("WakuStore is not set")
 	}
 
@@ -328,7 +347,7 @@ func (w *WakuNode) Query(ctx context.Context, contentTopics []string, startTime
 	query.StartTime = startTime
 	query.EndTime = endTime
 	query.PagingInfo = new(pb.PagingInfo)
-	result, err := w.opts.store.Query(ctx, query, opts...)
+	result, err := w.store.Query(ctx, query, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -336,11 +355,11 @@ func (w *WakuNode) Query(ctx context.Context, contentTopics []string, startTime
 }
 
 func (w *WakuNode) Resume(ctx context.Context, peerList []peer.ID) error {
-	if w.opts.store == nil {
+	if w.store == nil {
 		return errors.New("WakuStore is not set")
 	}
 
-	result, err := w.opts.store.Resume(ctx, string(relay.DefaultWakuTopic), peerList)
+	result, err := w.store.Resume(ctx, string(relay.DefaultWakuTopic), peerList)
 	if err != nil {
 		return err
 	}
@@ -439,34 +458,62 @@ func (node *WakuNode) subscribeToTopic(t relay.Topic, subscription *Subscription
 
 // Wrapper around WakuFilter.Subscribe
 // that adds a Filter object to node.filters
-// TODO: what's up with this channel?.......................... is it closed eventually?
-func (node *WakuNode) SubscribeFilter(ctx context.Context, topic string, contentTopics []string, ch filter.ContentFilterChan) error {
+func (node *WakuNode) SubscribeFilter(ctx context.Context, topic string, contentTopics []string) (filterID string, ch chan *protocol.Envelope, err error) {
 	if node.filter == nil {
-		return errors.New("WakuFilter is not set")
+		err = errors.New("WakuFilter is not set")
+		return
 	}
 
+	// TODO: should be possible to pass the peerID as option or autoselect peer.
+	// TODO: check if there's an existing pubsub topic that uses the same peer. If so, reuse filter, and return same channel and filterID
+
 	// Registers for messages that match a specific filter. Triggers the handler whenever a message is received.
 	// ContentFilterChan takes MessagePush structs
-
-	id, peerID, err := node.filter.Subscribe(ctx, topic, contentTopics)
-	if id == "" || err != nil {
+	var peerID *peer.ID
+	filterID, peerID, err = node.filter.Subscribe(ctx, topic, contentTopics)
+	if filterID == "" || err != nil {
 		// Failed to subscribe
 		log.Error("remote subscription to filter failed")
-		return err
+		return
 	}
 
+	ch = make(chan *protocol.Envelope, 1024) // To avoid blocking
+
 	// Register handler for filter, whether remote subscription succeeded or not
-	node.filters[id] = filter.Filter{
+	node.filters[filterID] = filter.Filter{
 		PeerID:         *peerID,
 		Topic:          topic,
 		ContentFilters: contentTopics,
 		Chan:           ch,
 	}
 
+	return
+}
+
+// UnsubscribeFilterByID removes a subscription to a filter node completely
+// using the filterID returned when the subscription was created
+func (node *WakuNode) UnsubscribeFilterByID(ctx context.Context, filterID string) error {
+
+	var f filter.Filter
+	var ok bool
+	if f, ok = node.filters[filterID]; !ok {
+		return errors.New("filter not found")
+	}
+
+	err := node.filter.Unsubscribe(ctx, f.Topic, f.ContentFilters, f.PeerID)
+	if err != nil {
+		return err
+	}
+
+	close(f.Chan)
+	delete(node.filters, filterID)
+
 	return nil
 }
 
-func (node *WakuNode) UnsubscribeFilter(ctx context.Context, topic string, contentTopics []string) {
+// Unsubscribe filter removes content topics from a filter subscription. If all
+// the contentTopics are removed the subscription is dropped completely
+func (node *WakuNode) UnsubscribeFilter(ctx context.Context, topic string, contentTopics []string) error {
 	// Remove local filter
 	var idsToRemove []string
 	for id, f := range node.filters {
@@ -499,11 +546,14 @@ func (node *WakuNode) UnsubscribeFilter(ctx context.Context, topic string, conte
 	for _, rId := range idsToRemove {
 		for id := range node.filters {
 			if id == rId {
+				close(node.filters[id].Chan)
 				delete(node.filters, id)
 				break
 			}
 		}
 	}
+
+	return nil
 }
 
 func (node *WakuNode) Publish(ctx context.Context, message *pb.WakuMessage, topic *relay.Topic) ([]byte, error) {

waku/v2/protocol/filter/waku_filter.go

@@ -22,13 +22,11 @@ import (
 var log = logging.Logger("wakufilter")
 
 type (
-	ContentFilterChan chan *protocol.Envelope
-
 	Filter struct {
 		PeerID         peer.ID
 		Topic          string
 		ContentFilters []string
-		Chan           ContentFilterChan
+		Chan           chan *protocol.Envelope
 	}
 
 	// @TODO MAYBE MORE INFO?
@@ -234,7 +232,7 @@ func (wf *WakuFilter) FilterListener() {
 // Having a FilterRequest struct,
 // select a peer with filter support, dial it,
 // and submit FilterRequest wrapped in FilterRPC
-func (wf *WakuFilter) Subscribe(ctx context.Context, topic string, contentTopics []string) (string, *peer.ID, error) {
+func (wf *WakuFilter) Subscribe(ctx context.Context, topic string, contentTopics []string) (requestID string, peer *peer.ID, err error) {
 	var contentFilters []*pb.FilterRequest_ContentFilter
 	for _, ct := range contentTopics {
 		contentFilters = append(contentFilters, &pb.FilterRequest_ContentFilter{ContentTopic: ct})
@@ -246,38 +244,41 @@ func (wf *WakuFilter) Subscribe(ctx context.Context, topic string, contentTopics
 		ContentFilters: contentFilters,
 	}
 
-	peer, err := utils.SelectPeer(wf.h, string(FilterID_v20beta1))
-	if err == nil {
-		conn, err := wf.h.NewStream(ctx, *peer, FilterID_v20beta1)
+	peer, err = utils.SelectPeer(wf.h, string(FilterID_v20beta1))
+	if err != nil {
+		return
+	}
+
+	var conn network.Stream
+	conn, err = wf.h.NewStream(ctx, *peer, FilterID_v20beta1)
+	if err != nil {
+		return
+	}
 
-		if conn != nil {
 	defer conn.Close()
 
 	// This is the only successful path to subscription
-			id := protocol.GenerateRequestId()
+	requestID = hex.EncodeToString(protocol.GenerateRequestId())
 
 	writer := protoio.NewDelimitedWriter(conn)
-			filterRPC := &pb.FilterRPC{RequestId: hex.EncodeToString(id), Request: &request}
+	filterRPC := &pb.FilterRPC{RequestId: requestID, Request: &request}
 	log.Info("sending filterRPC: ", filterRPC)
 	err = writer.WriteMsg(filterRPC)
 	if err != nil {
 		log.Error("failed to write message", err)
-				return "", nil, err
-			}
-			return string(id), peer, nil
-		} else {
-			log.Error("failed to connect to remote peer")
-			return "", nil, err
-		}
+		return
 	}
 
-	log.Info("error selecting peer: ", err)
-	return "", nil, err
+	return
 }
 
-func (wf *WakuFilter) Unsubscribe(ctx context.Context, topic string, contentTopics []string, peer peer.ID) {
+func (wf *WakuFilter) Unsubscribe(ctx context.Context, topic string, contentTopics []string, peer peer.ID) error {
 	conn, err := wf.h.NewStream(ctx, peer, FilterID_v20beta1)
-	if conn != nil {
+
+	if err != nil {
+		return err
+	}
+
 	defer conn.Close()
 
 	// This is the only successful path to subscription
@@ -298,9 +299,12 @@ func (wf *WakuFilter) Unsubscribe(ctx context.Context, topic string, contentTopi
 	filterRPC := &pb.FilterRPC{RequestId: hex.EncodeToString(id), Request: &request}
 	err = writer.WriteMsg(filterRPC)
 	if err != nil {
-			log.Error("failed to write message", err)
+		return err
 	}
-	} else {
-		log.Error("failed to connect to remote peer", err)
+
+	return nil
 }
+
+func (wf *WakuFilter) Stop() {
+	wf.h.RemoveStreamHandler(FilterID_v20beta1)
 }

waku/v2/protocol/lightpush/waku_lightpush.go

@@ -203,3 +203,7 @@ func (wakuLP *WakuLightPush) Request(ctx context.Context, req *pb.PushRequest, o
 
 	return pushResponseRPC.Response, nil
 }
+
+func (w *WakuLightPush) Stop() {
+	w.h.RemoveStreamHandler(LightPushID_v20beta1)
+}

waku/v2/protocol/relay/waku_relay.go

@@ -175,3 +175,7 @@ func GetTopic(topic *Topic) Topic {
 	}
 	return t
 }
+
+func (w *WakuRelay) Stop() {
+	w.host.RemoveStreamHandler(WakuRelayID_v200)
+}

waku/v2/protocol/store/waku_store.go

@@ -622,3 +622,7 @@ func (store *WakuStore) Resume(ctx context.Context, pubsubTopic string, peerList
 }
 
 // TODO: queryWithAccounting
+
+func (w *WakuStore) Stop() {
+	w.h.RemoveStreamHandler(StoreID_v20beta3)
+}