add replication for rounds and sequences

Author: samliok

api.go

@@ -56,14 +56,16 @@ type Storage interface {
 	Index(ctx context.Context, block VerifiedBlock, certificate Finalization) error
 }
 
-type Communication interface {
+type Sender interface {
+	// Send sends a message to the given destination node
+	Send(msg *Message, destination NodeID)
+}
 
+type Communication interface {
+	Sender
 	// Nodes returns all nodes that participate in the epoch.
 	Nodes() []NodeID
 
-	// Send sends a message to the given destination node
-	Send(msg *Message, destination NodeID)
-
 	// Broadcast broadcasts the given message to all nodes.
 	// Does not send it to yourself.
 	Broadcast(msg *Message)