only enable randomness service on leader

consensus readched on AWS deployment

Signed-off-by: Leo Chen <leo@harmony.one>

cmd/harmony.go

@@ -279,7 +279,7 @@ func main() {
 	// Add randomness protocol
 	// TODO: enable drand only for beacon chain
 	// TODO: put this in a better place other than main.
-	dRand := drand.New(host, shardID, peers, leader, currentNode.ConfirmedBlockChannel)
+	dRand := drand.New(host, shardID, peers, leader, currentNode.ConfirmedBlockChannel, *isLeader)
 	currentNode.Consensus.RegisterPRndChannel(dRand.PRndChannel)
 	currentNode.Consensus.RegisterRndChannel(dRand.RndChannel)
 	currentNode.DRand = dRand

drand/drand.go

@@ -67,7 +67,7 @@ type DRand struct {
 }
 
 // New creates a new dRand object
-func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer, confirmedBlockChannel chan *types.Block) *DRand {
+func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer, confirmedBlockChannel chan *types.Block, isLeader bool) *DRand {
 	dRand := DRand{}
 	dRand.host = host
 
@@ -79,11 +79,7 @@ func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer, confi
 	dRand.RndChannel = make(chan [64]byte)
 
 	selfPeer := host.GetSelfPeer()
-	if leader.Port == selfPeer.Port && leader.IP == selfPeer.IP {
-		dRand.IsLeader = true
-	} else {
-		dRand.IsLeader = false
-	}
+	dRand.IsLeader = isLeader
 
 	dRand.leader = leader
 	for _, peer := range peers {

node/service_setup.go

@@ -71,8 +71,6 @@ func (node *Node) setupForBeaconValidator() {
 	node.serviceManager.RegisterService(service.PeerDiscovery, discovery.New(node.host, nodeConfig, chanPeer))
 	// Register networkinfo service.
 	node.serviceManager.RegisterService(service.NetworkInfo, networkinfo.New(node.host, p2p.GroupIDBeacon, chanPeer))
-	// Register randomness service
-	node.serviceManager.RegisterService(service.Randomness, randomness.New(node.DRand))
 }
 
 func (node *Node) setupForNewNode() {