add max_network_latency

mixnet/v2/sim/config.py

@@ -22,6 +22,8 @@ class Config:
     cover_message_prob: float
     # A maximum preparation time (delay) before sending the message
     max_message_prep_time: float
+    # A maximum network latency between nodes directly connected with each other
+    max_network_latency: float
 
     @classmethod
     def load(cls, yaml_path: str) -> Self:
@@ -40,5 +42,6 @@ class Config:
             assert weight >= 1
         assert config.cover_message_prob >= 0
         assert config.max_message_prep_time >= 0
+        assert config.max_network_latency >= 0
 
         return config

mixnet/v2/sim/config.yaml

@@ -13,4 +13,6 @@ real_message_prob_weights: [10, 8, 12]
 # A probability of sending a cover message within a cycle if not sending a real message
 cover_message_prob: 0.2
 # A maximum preparation time (delay) before sending the message
-max_message_prep_time: 0.3
+max_message_prep_time: 0.3
+# A maximum network latency between nodes directly connected with each other
+max_network_latency: 0.5

mixnet/v2/sim/node.py

@@ -74,7 +74,7 @@ class Node:
         @param msg: the message to be processed
         """
         # simulating network latency
-        yield self.env.timeout(random.randint(0, 3))
+        yield self.env.timeout(random.uniform(0, self.config.max_network_latency))
 
         if isinstance(msg, SphinxPacket):
             msg, incentive_tx = msg.unwrap(self.private_key)