Display block propagation time

packages/backend/src/Chain.ts

@@ -77,10 +77,13 @@ export default class Chain {
     if (node.height > this.height) {
       this.height = node.height;
       this.blockTimestamp = node.blockTimestamp;
+      node.propagationTime = 0 as Types.PropagationTime;
 
       this.feeds.broadcast(Feed.bestBlock(this.height, this.blockTimestamp));
 
       console.log(`[${this.label}] New block ${this.height}`);
+    } else if (node.height === this.height) {
+      node.propagationTime = (node.blockTimestamp - this.blockTimestamp) as Types.PropagationTime;
     }
 
     this.feeds.broadcast(Feed.imported(node));

packages/backend/src/Node.ts

@@ -25,6 +25,7 @@ export default class Node {
   public latency = 0 as Types.Milliseconds;
   public blockTime = 0 as Types.Milliseconds;
   public blockTimestamp = 0 as Types.Timestamp;
+  public propagationTime: Maybe<Types.PropagationTime> = null;
 
   private peers = 0 as Types.PeerCount;
   private txcount = 0 as Types.TransactionCount;
@@ -132,7 +133,7 @@ export default class Node {
   }
 
   public blockDetails(): Types.BlockDetails {
-    return [this.height, this.best, this.blockTime, this.blockTimestamp];
+    return [this.height, this.best, this.blockTime, this.blockTimestamp, this.propagationTime];
   }
 
   public get average(): number {