fix handling of new streams on peer reconnects

floodsub.go

@@ -102,11 +102,10 @@ func (p *PubSub) processLoop(ctx context.Context) {
 		select {
 		case s := <-p.newPeers:
 			pid := s.Conn().RemotePeer()
-			_, ok := p.peers[pid]
+			ch, ok := p.peers[pid]
 			if ok {
 				log.Error("already have connection to peer: ", pid)
-				s.Close()
-				continue
+				close(ch)
 			}
 
 			messages := make(chan *RPC, 32)
@@ -116,6 +115,11 @@ func (p *PubSub) processLoop(ctx context.Context) {
 			p.peers[pid] = messages
 
 		case pid := <-p.peerDead:
+			ch, ok := p.peers[pid]
+			if ok {
+				close(ch)
+			}
+
 			delete(p.peers, pid)
 			for _, t := range p.topics {
 				delete(t, pid)
@@ -238,8 +242,12 @@ func (p *PubSub) handleIncomingRPC(rpc *RPC) error {
 	return nil
 }
 
+func msgID(pmsg *pb.Message) string {
+	return string(pmsg.GetFrom()) + string(pmsg.GetSeqno())
+}
+
 func (p *PubSub) maybePublishMessage(from peer.ID, pmsg *pb.Message) {
-	id := string(pmsg.GetFrom()) + string(pmsg.GetSeqno())
+	id := msgID(pmsg)
 	if p.seenMessage(id) {
 		return
 	}