surrogate_gossiper.go
func (*surrogateGossiper) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error) {
	return newSurrogateGossipData(update), nil
}
func (*surrogateGossiper) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error) {
	return newSurrogateGossipData(update), nil
}
// OnGossipBroadcast implements Gossiper.