correct median; on genesis validators list is empty

Signed-off-by: Uncle Stinky <uncle.stinky@ghostchain.io>

pallets/slow-clap/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ghost-slow-clap"
-version = "0.4.4"
+version = "0.4.5"
 description = "Applause protocol for the EVM bridge"
 license.workspace = true
 authors.workspace = true

pallets/slow-clap/src/lib.rs

@@ -597,8 +597,8 @@ impl<T: Config> Pallet<T> {
         );
 
         let (session_index, clap_unique_hash) = Self::mended_session_index(&clap);
-        let validators = Validators::<T>::get(&session_index);
-        let validators_length = validators.len();
+        let authorities = Authorities::<T>::get(&session_index);
+        let authorities_length = authorities.len();
 
         let is_disabled = DisabledAuthorityIndexes::<T>::get(&session_index)
             .map(|bitmap| bitmap.exists(&clap.authority_index))
@@ -627,7 +627,7 @@ impl<T: Config> Pallet<T> {
                         LatestExecutedBlock::<T>::get(&network_id) <= clap.block_number,
                         Error::<T>::ExecutedBlockIsHigher,
                     );
-                    ApplauseDetail::new(network_id, clap.block_number, validators_length)
+                    ApplauseDetail::new(network_id, clap.block_number, authorities_length)
                 }
             };
 
@@ -665,7 +665,7 @@ impl<T: Config> Pallet<T> {
         let is_enough = applause_details
             .authorities
             .count_ones()
-            .gt(&(validators_length as u32 / 2));
+            .gt(&(authorities_length as u32 / 2));
 
         if total_clapped > threshold_amount && is_enough && !applause_details.finalized {
             applause_details.finalized = true;
@@ -760,7 +760,7 @@ impl<T: Config> Pallet<T> {
             })
             .unwrap_or_default();
 
-        if current_commits > 1 {
+        if current_commits > 2 && validators.len() > 0 {
             let offence_bitmap = Self::capture_deviation_in_commitments_and_remove(
                 &disabled_bitmap,
                 &block_commitments,
@@ -899,9 +899,8 @@ impl<T: Config> Pallet<T> {
 
                 log::info!(
                     target: LOG_TARGET,
-                    "👻 Stored from_block is #{:?} from authority #{:?} for network {:?}",
+                    "👻 Stored from_block is #{:?} for network {:?}",
                     new_block_range.0,
-                    authority_index,
                     network_id,
                 );
 
@@ -1080,11 +1079,13 @@ impl<T: Config> Pallet<T> {
     fn calculate_weighted_median(values: &mut Vec<(AuthIndex, u64)>) -> u64 {
         values.sort_by_key(|data| data.1);
 
-        let mid = values.len() / 2;
-        if values.len() % 2 == 1 {
-            values[mid].1
+        let length = values.len();
+        if length % 2 == 0 {
+            let mid_left = values[length / 2 - 1].1;
+            let mid_right = values[length / 2].1;
+            (mid_left + mid_right) / 2
         } else {
-            values[mid - 1].1
+            values[length / 2].1
         }
     }
 

pallets/slow-clap/src/tests.rs

@@ -1182,6 +1182,50 @@ fn should_not_slash_by_applause_if_disabled_by_commitment() {
     });
 }
 
+#[test]
+fn should_not_nullify_on_incorrect_block_commitment() {
+    let (network_id, _, _) = generate_unique_hash(None, None, None, None, None);
+
+    new_test_ext().execute_with(|| {
+        let session_index = advance_session_and_get_index();
+        prepare_evm_network(None, None);
+
+        let timestamp = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .expect("Time went backwards")
+            .as_millis() as u64;
+
+        let mut block_commitment = CommitmentDetails {
+            last_stored_block: 9_500_000,
+            commits: 420,
+            last_updated: timestamp,
+        };
+
+        for i in 0..4 {
+            assert_ok!(do_block_commitment(
+                    session_index,
+                    network_id,
+                    i,
+                    &block_commitment
+            ));
+        }
+
+        block_commitment.last_updated = 0;
+        assert_err!(do_block_commitment(
+                session_index,
+                network_id,
+                3,
+                &block_commitment),
+            Error::<Runtime>::TimeWentBackwards);
+
+        for commitment_details in BlockCommitments::<Runtime>::get(network_id).values() {
+            assert_eq!(commitment_details.last_stored_block, 9_500_000);
+            assert_eq!(commitment_details.last_updated, timestamp);
+            assert_eq!(commitment_details.commits, 1);
+        }
+    });
+}
+
 fn assert_clapped_amount(
     session_index: &SessionIndex,
     unique_hash: &H256,