Bugfix when generating stats for 0-length detection keys

src/main.rs

@@ -48,17 +48,23 @@ fn main() {
     println!("Simulating Adversarial Server Processing Messages..");
     server.test_messages();
 
-    let round_statistics = server.statistics();
+    let (round_stats, party_stats) = server.statistics();
+
+    let if_uniform = (round_stats.num_messages as f64) / (round_stats.num_registered_parties as f64);
+    println!(
+        "Round had {}  messages, send to {} parties ({:.2} is uniform distribution)",
+        round_stats.num_messages, round_stats.num_registered_parties, if_uniform
+    );
     let mut stdout = StandardStream::stdout(ColorChoice::Always);
-    for (party, stats) in round_statistics.iter() {
-        if stats.trivial_breaks > 0 || stats.observed_skew > 10.0 {
+    for (party, stats) in party_stats.iter() {
+        if stats.trivial_breaks > 0 || stats.observed_skew > (if_uniform * stats.ideal_rate) {
             stdout.set_color(ColorSpec::new().set_fg(Some(Color::Red))).unwrap();
         } else {
             stdout.set_color(ColorSpec::new().set_fg(Some(Color::Green))).unwrap();
         }
         writeln!(
             &mut stdout,
-            "Party {} | Ideal: {} | Observed: {} ({:.2})  | Skew: {} ({:.2}) | Trivial Attributions this Round: {}",
+            "Party {} | Ideal: {} | Observed: {} ({:.2})  | Skew: {} ({}) | Trivial Attributions this Round: {}",
             party,
             stats.ideal_rate,
             stats.observed_messages,

src/parties.rs

@@ -36,9 +36,10 @@ impl SimulatedParties {
     {
         let v = distribution.sample(rng).to_u16().unwrap();
         let receiver = rng.gen_range(0..self.parties.len());
-        println!("[Oracle] {} received {} messages", self.parties.get(receiver).unwrap().public_key().id(), v);
+        let receiver_public_key = self.parties.get(receiver).unwrap().public_key();
+        println!("[Oracle] {} received {} messages", receiver_public_key.id(), v);
         for _i in 0..v {
-            let tag = self.parties.get(receiver).unwrap().public_key().generate_tag();
+            let tag = receiver_public_key.generate_tag();
             server.add_message(tag);
             //message_oracle.push(receiver);
         }

src/server.rs

@@ -4,10 +4,16 @@ use hashbrown::HashMap;
 pub struct SimulatedServer {
     keybase: Vec<(FuzzyDetectionKey, FuzzyPublicKey)>,
     messages: Vec<FuzzyTag>,
-    tags_to_keys_cache: HashMap<String, Vec<FuzzyDetectionKey>>,
+    tags_to_keys_cache: HashMap<String, Vec<FuzzyPublicKey>>,
     keys_to_tags_cache: HashMap<String, Vec<FuzzyTag>>,
 }
 
+pub struct RoundStatistics {
+    pub num_registered_parties: usize,
+    pub num_messages: usize,
+}
+
+#[derive(Debug)]
 pub struct PartyStatistics {
     pub ideal_rate: f64,
     pub expected_messages: f64,
@@ -30,7 +36,7 @@ impl SimulatedServer {
 
     pub fn register_key(&mut self, detection_key: &FuzzyDetectionKey, public_key: &FuzzyPublicKey) {
         self.keybase.push((detection_key.clone(), public_key.clone()));
-        self.keys_to_tags_cache.insert(detection_key.id(), vec![]);
+        self.keys_to_tags_cache.insert(public_key.id(), vec![]);
     }
 
     pub fn add_message(&mut self, tag: FuzzyTag) {
@@ -40,24 +46,30 @@ impl SimulatedServer {
 
     pub fn test_messages(&mut self) {
         for message in self.messages.iter() {
-            for (detection_key, _) in self.keybase.iter() {
+            for (detection_key, public_key) in self.keybase.iter() {
                 if detection_key.test_tag(message) {
-                    self.tags_to_keys_cache.get_mut(message.to_string().as_str()).unwrap().push((*detection_key).clone());
-                    self.keys_to_tags_cache.get_mut(detection_key.id().as_str()).unwrap().push((*message).clone());
+                    self.tags_to_keys_cache.get_mut(message.to_string().as_str()).unwrap().push((*public_key).clone());
+
+                    self.keys_to_tags_cache.get_mut(public_key.id().as_str()).unwrap().push((*message).clone());
                 }
             }
         }
     }
 
-    pub fn statistics(&self) -> HashMap<String, PartyStatistics> {
-        let mut stats = HashMap::new();
+    pub fn statistics(&self) -> (RoundStatistics, HashMap<String, PartyStatistics>) {
+        let mut party_stats = HashMap::new();
+        let round_stats = RoundStatistics {
+            num_messages: self.messages.len(),
+            num_registered_parties: self.keybase.len(),
+        };
         for (party, pub_key) in self.keybase.iter() {
-            let matched = self.keys_to_tags_cache[party.id().as_str()].clone();
+            let matched = self.keys_to_tags_cache[pub_key.id().as_str()].clone();
             let observed_messages = matched.len();
             let ideal_rate = party.false_positive_probability();
+            let expected_messages = ideal_rate * (round_stats.num_messages as f64);
+
             let observed_rate = (observed_messages as f64) / (self.messages.len() as f64);
-            let expected_messages = ideal_rate * (self.messages.len() as f64);
-            let observed_skew_messages = expected_messages - (observed_messages as f64);
+            let observed_skew_messages = (observed_messages as f64) - expected_messages;
             let observed_skew = (observed_messages as f64) / expected_messages;
 
             let mut trivial_breaks = 0;
@@ -67,19 +79,21 @@ impl SimulatedServer {
                 }
             }
 
-            stats.insert(
-                pub_key.id(),
-                PartyStatistics {
-                    ideal_rate,
-                    expected_messages,
-                    observed_messages,
-                    observed_rate,
-                    observed_skew_messages,
-                    observed_skew,
-                    trivial_breaks,
-                },
-            );
+            let p_stats = PartyStatistics {
+                ideal_rate,
+                expected_messages,
+                observed_messages,
+                observed_rate,
+                observed_skew_messages,
+                observed_skew,
+                trivial_breaks,
+            };
+
+            println!("{:?}", p_stats);
+
+            party_stats.insert(pub_key.id(), p_stats);
         }
-        stats
+
+        (round_stats, party_stats)
     }
 }