From d0979258f781e697ae08effed35187d2381b04b4 Mon Sep 17 00:00:00 2001
From: vyzo <vyzo@hackzen.org>
Date: Sun, 22 Mar 2020 20:52:19 +0200
Subject: [PATCH] shuffle IWANT list

---
 gossipsub.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gossipsub.go b/gossipsub.go
index 36a11fc..cda790d 100644
--- a/gossipsub.go
+++ b/gossipsub.go
@@ -318,6 +318,9 @@ func (gs *GossipSubRouter) handleIHave(p peer.ID, ctl *pb.ControlMessage) []*pb.
 		iwantlst = append(iwantlst, mid)
 	}
 
+	// ask in random order
+	shuffleStrings(iwantlst)
+
 	return []*pb.ControlIWant{&pb.ControlIWant{MessageIDs: iwantlst}}
 }
 
@@ -1151,3 +1154,10 @@ func shufflePeerInfo(peers []*pb.PeerInfo) {
 		peers[i], peers[j] = peers[j], peers[i]
 	}
 }
+
+func shuffleStrings(lst []string) {
+	for i := range lst {
+		j := rand.Intn(i + 1)
+		lst[i], lst[j] = lst[j], lst[i]
+	}
+}