Count # of messages broadcasted by each node (#21)

network-runner/src/node/mix/mod.rs

@@ -143,6 +143,7 @@ impl MixNode {
                 node_id: id,
                 mock_counter: 0,
                 step_id: 0,
+                num_messages_broadcasted: 0,
             },
             msg_gen_rng: ChaCha12Rng::from_rng(&mut rng_generator).unwrap(),
             persistent_sender,
@@ -217,7 +218,8 @@ impl Node for MixNode {
                     persistent_sender.send(msg).unwrap();
                 }
                 MixOutgoingMessage::FullyUnwrapped(_) => {
-                    //TODO: increase counter and create a tracing event
+                    self.state.num_messages_broadcasted += 1;
+                    //TODO: create a tracing event
                 }
             }
         }

network-runner/src/node/mix/state.rs

@@ -14,6 +14,7 @@ pub struct MixnodeState {
     pub node_id: NodeId,
     pub mock_counter: usize,
     pub step_id: usize,
+    pub num_messages_broadcasted: usize,
 }
 
 #[derive(Serialize)]