Add number_of_hops (for cover traffic) in config (#45)

simlib/mixnet-sims/config/mixnode.json

@@ -38,11 +38,12 @@
   "stake_proportion": 1.0,
   "epoch_duration": "432000s",
   "slot_duration": "1s",
+  "slots_per_epoch": 432000,
+  "number_of_hops": 1,
   "persistent_transmission": {
     "max_emission_frequency": 1.0,
     "drop_message_probability": 0.0
   },
   "number_of_mix_layers": 1,
-  "max_delay_seconds": 10,
-  "slots_per_epoch": 432000
+  "max_delay_seconds": 10
 }

simlib/mixnet-sims/src/main.rs

@@ -123,7 +123,7 @@ impl SimulationApp {
                         },
                         cover_traffic_settings: CoverTrafficSettings {
                             node_id: node_id.0,
-                            number_of_hops: settings.number_of_mix_layers,
+                            number_of_hops: settings.number_of_hops,
                             slots_per_epoch: settings.slots_per_epoch,
                             network_size: node_ids.len(),
                         },

simlib/mixnet-sims/src/settings.rs

@@ -11,14 +11,18 @@ pub struct SimSettings {
     #[serde(deserialize_with = "deserialize_duration_with_human_time")]
     pub data_message_lottery_interval: Duration,
     pub stake_proportion: f64,
+    // For tier 3: cover traffic
     #[serde(deserialize_with = "deserialize_duration_with_human_time")]
     pub epoch_duration: Duration,
     #[serde(deserialize_with = "deserialize_duration_with_human_time")]
     pub slot_duration: Duration,
+    pub slots_per_epoch: usize,
+    pub number_of_hops: usize,
+    // For tier 1
     pub persistent_transmission: PersistentTransmissionSettings,
+    // For tier 2
     pub number_of_mix_layers: usize,
     pub max_delay_seconds: u64,
-    pub slots_per_epoch: usize,
 }
 
 fn deserialize_duration_with_human_time<'de, D>(deserializer: D) -> Result<Duration, D::Error>