dex: redesign p2p network topology

- Let p2p server support direct connection and group connection.
- Introduce node meta table to maintain IP of all nodes in node set,
  in memory and let nodes in the network can sync this table.
- Let peerSet able to manage direct connections to notary set and dkg set.

The mechanism to refresh the network topology when configuration round
change is not done yet.

1 files changed, 9 insertions, 8 deletions

diff --git a/dex/network.go b/dex/network.go
index c3a0ef792..b19b46147 100644
--- a/dex/network.go
+++ b/dex/network.go
@@ -23,14 +23,6 @@ func (n *DexconNetwork) BroadcastVote(vote *types.Vote) {
 func (n *DexconNetwork) BroadcastBlock(block *types.Block) {
 }
 
-// BroadcastRandomnessRequest broadcasts rand request to DKG set.
-func (n *DexconNetwork) BroadcastRandomnessRequest(randRequest *types.AgreementResult) {
-}
-
-// BroadcastRandomnessResult broadcasts rand request to Notary set.
-func (n *DexconNetwork) BroadcastRandomnessResult(randResult *types.BlockRandomnessResult) {
-}
-
 // SendDKGPrivateShare sends PrivateShare to a DKG participant.
 func (n *DexconNetwork) SendDKGPrivateShare(
 	pub crypto.PublicKey, prvShare *types.DKGPrivateShare) {
@@ -47,6 +39,15 @@ func (n *DexconNetwork) BroadcastDKGPartialSignature(
 	psig *types.DKGPartialSignature) {
 }
 
+// BroadcastRandomnessRequest broadcasts rand request to DKG set.
+func (n *DexconNetwork) BroadcastRandomnessRequest(randRequest *types.AgreementResult) {
+
+}
+
+// BroadcastRandomnessResult broadcasts rand request to Notary set.
+func (n *DexconNetwork) BroadcastRandomnessResult(randResult *types.BlockRandomnessResult) {
+}
+
 // ReceiveChan returns a channel to receive messages from DEXON network.
 func (n *DexconNetwork) ReceiveChan() <-chan interface{} {
 	return n.receiveChan