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, 7 insertions, 0 deletions

diff --git a/core/events.go b/core/events.go
index 02a083002..e76aa4784 100644
--- a/core/events.go
+++ b/core/events.go
@@ -46,3 +46,10 @@ type ChainSideEvent struct {
 }
 
 type ChainHeadEvent struct{ Block *types.Block }
+
+type NewNotarySetEvent struct {
+	Round   uint64
+	Pubkeys map[string]struct{} // pubkeys in hex format
+}
+
+type NewCRSEvent struct{ Round uint64 }