From c5fe29038957c3b83cc619e98b37d37c7a325ae9 Mon Sep 17 00:00:00 2001
From: vyzo <vyzo@hackzen.org>
Date: Tue, 20 Feb 2018 15:10:16 +0200
Subject: [PATCH] reduce gossip amplification; don't send to mesh peers

---
 gossipsub.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gossipsub.go b/gossipsub.go
index 63dfef3..7efc160 100644
--- a/gossipsub.go
+++ b/gossipsub.go
@@ -373,7 +373,11 @@ func (gs *GossipSubRouter) heartbeat() {
 
 		gpeers := gs.getPeers(topic, func(peer.ID) bool { return true })
 		for _, p := range gpeers[:GossipSubD] {
-			gs.pushGossip(p, &pb.ControlIHave{TopicID: &topic, MessageIDs: mids})
+			// skip mesh peers
+			_, ok := peers[p]
+			if !ok {
+				gs.pushGossip(p, &pb.ControlIHave{TopicID: &topic, MessageIDs: mids})
+			}
 		}
 	}