switch vote program to use slot height instead of tick height, change confirmation computation to use slots

sdk/src/vote_program.rs

@@ -27,13 +27,13 @@ pub const MAX_VOTE_HISTORY: usize = 32;
 #[derive(Serialize, Default, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub struct Vote {
     // TODO: add signature of the state here as well
-    /// A vote for height tick_height
-    pub tick_height: u64,
+    /// A vote for height slot_height
+    pub slot_height: u64,
 }
 
 impl Vote {
-    pub fn new(tick_height: u64) -> Self {
-        Self { tick_height }
+    pub fn new(slot_height: u64) -> Self {
+        Self { slot_height }
     }
 }
 

sdk/src/vote_transaction.rs

@@ -14,11 +14,11 @@ pub struct VoteTransaction {}
 impl VoteTransaction {
     pub fn new_vote<T: KeypairUtil>(
         voting_keypair: &T,
-        tick_height: u64,
+        slot_height: u64,
         last_id: Hash,
         fee: u64,
     ) -> Transaction {
-        let vote = Vote { tick_height };
+        let vote = Vote { slot_height };
         let instruction = VoteInstruction::Vote(vote);
         Transaction::new(
             voting_keypair,
@@ -81,12 +81,12 @@ mod tests {
     #[test]
     fn test_get_votes() {
         let keypair = Keypair::new();
-        let tick_height = 1;
+        let slot_height = 1;
         let last_id = Hash::default();
-        let transaction = VoteTransaction::new_vote(&keypair, tick_height, last_id, 0);
+        let transaction = VoteTransaction::new_vote(&keypair, slot_height, last_id, 0);
         assert_eq!(
             VoteTransaction::get_votes(&transaction),
-            vec![(keypair.pubkey(), Vote::new(tick_height), last_id)]
+            vec![(keypair.pubkey(), Vote::new(slot_height), last_id)]
         );
     }
 }

src/active_stakers.rs

@@ -10,7 +10,7 @@ fn is_active_staker(vote_state: &VoteState, lower_bound: u64, upper_bound: u64)
     vote_state
         .votes
         .back()
-        .filter(|vote| vote.tick_height >= lower_bound && vote.tick_height <= upper_bound)
+        .filter(|vote| vote.slot_height >= lower_bound && vote.slot_height <= upper_bound)
         .is_some()
 }
 
@@ -36,8 +36,8 @@ pub struct ActiveStakers {
 }
 
 impl ActiveStakers {
-    pub fn new_with_bounds(bank: &Bank, active_window_tick_length: u64, upper_bound: u64) -> Self {
-        let lower_bound = upper_bound.saturating_sub(active_window_tick_length);
+    pub fn new_with_bounds(bank: &Bank, active_window_num_slots: u64, upper_bound: u64) -> Self {
+        let lower_bound = upper_bound.saturating_sub(active_window_num_slots);
         let mut stakes: Vec<_> = bank
             .vote_states(|vote_state| is_active_staker(vote_state, lower_bound, upper_bound))
             .iter()
@@ -96,9 +96,9 @@ pub mod tests {
         bank.process_transaction(&tx).unwrap();
     }
 
-    pub fn push_vote<T: KeypairUtil>(voting_keypair: &T, bank: &Bank, tick_height: u64) {
+    pub fn push_vote<T: KeypairUtil>(voting_keypair: &T, bank: &Bank, slot_height: u64) {
         let last_id = bank.last_id();
-        let tx = VoteTransaction::new_vote(voting_keypair, tick_height, last_id, 0);
+        let tx = VoteTransaction::new_vote(voting_keypair, slot_height, last_id, 0);
         bank.process_transaction(&tx).unwrap();
     }
 
@@ -107,10 +107,10 @@ pub mod tests {
         voting_keypair: &T,
         bank: &Bank,
         num_tokens: u64,
-        tick_height: u64,
+        slot_height: u64,
     ) {
         new_vote_account(from_keypair, &voting_keypair.pubkey(), bank, num_tokens);
-        push_vote(voting_keypair, bank, tick_height);
+        push_vote(voting_keypair, bank, slot_height);
     }
 
     #[test]
@@ -154,8 +154,8 @@ pub mod tests {
                 .unwrap();
 
             // Create a vote account and push a vote
-            let tick_height = start_height + active_window_tick_length + 1;
-            new_vote_account_with_vote(&new_keypair, &Keypair::new(), &bank, 1, tick_height);
+            let slot_height = start_height + active_window_tick_length + 1;
+            new_vote_account_with_vote(&new_keypair, &Keypair::new(), &bank, 1, slot_height);
         }
         new_ids.sort();
 
@@ -273,7 +273,7 @@ pub mod tests {
             assert_eq!(result.len(), 0);
         }
 
-        // Vote at tick_height 2
+        // Vote at slot_height 2
         push_vote(&voting_keypair, &bank, 2);
 
         {

src/banking_stage.rs

@@ -59,6 +59,7 @@ impl BankingStage {
             max_tick_height,
         };
 
+        let ticks_per_slot = max_tick_height - bank.tick_height();
         let poh_recorder = PohRecorder::new(bank.tick_height(), *last_entry_id);
 
         // Single thread to generate entries from many banks.
@@ -74,8 +75,12 @@ impl BankingStage {
             .expect("failed to send leader to poh_service");
 
         // Single thread to compute confirmation
-        let leader_confirmation_service =
-            LeaderConfirmationService::new(bank.clone(), leader_id, poh_exit.clone());
+        let leader_confirmation_service = LeaderConfirmationService::new(
+            bank.clone(),
+            leader_id,
+            poh_exit.clone(),
+            ticks_per_slot,
+        );
 
         // Many banks that process transactions in parallel.
         let bank_thread_hdls: Vec<JoinHandle<UnprocessedPackets>> = (0..Self::num_threads())

src/leader_confirmation_service.rs

@@ -30,6 +30,7 @@ impl LeaderConfirmationService {
         bank: &Arc<Bank>,
         leader_id: Pubkey,
         last_valid_validator_timestamp: u64,
+        ticks_per_slot: u64,
     ) -> result::Result<u64, ConfirmationError> {
         let mut total_stake = 0;
 
@@ -47,7 +48,8 @@ impl LeaderConfirmationService {
                 vote_state
                     .votes
                     .back()
-                    .map(|vote| (vote.tick_height, validator_stake))
+                    // A vote for a slot is like a vote for the last tick in that slot
+                    .map(|vote| ((vote.slot_height + 1) * ticks_per_slot - 1, validator_stake))
             })
             .collect();
 
@@ -78,10 +80,14 @@ impl LeaderConfirmationService {
         bank: &Arc<Bank>,
         leader_id: Pubkey,
         last_valid_validator_timestamp: &mut u64,
+        ticks_per_slot: u64,
+    ) {
+        if let Ok(super_majority_timestamp) = Self::get_last_supermajority_timestamp(
+            bank,
+            leader_id,
+            *last_valid_validator_timestamp,
+            ticks_per_slot,
         ) {
-        if let Ok(super_majority_timestamp) =
-            Self::get_last_supermajority_timestamp(bank, leader_id, *last_valid_validator_timestamp)
-        {
             let now = timing::timestamp();
             let confirmation_ms = now - super_majority_timestamp;
 
@@ -99,9 +105,14 @@ impl LeaderConfirmationService {
     }
 
     /// Create a new LeaderConfirmationService for computing confirmation.
-    pub fn new(bank: Arc<Bank>, leader_id: Pubkey, exit: Arc<AtomicBool>) -> Self {
+    pub fn new(
+        bank: Arc<Bank>,
+        leader_id: Pubkey,
+        exit: Arc<AtomicBool>,
+        ticks_per_slot: u64,
+    ) -> Self {
         let thread_hdl = Builder::new()
-            .name("solana-leader-confirmation-stage".to_string())
+            .name("solana-leader-confirmation-service".to_string())
             .spawn(move || {
                 let mut last_valid_validator_timestamp = 0;
                 loop {
@@ -112,6 +123,7 @@ impl LeaderConfirmationService {
                         &bank,
                         leader_id,
                         &mut last_valid_validator_timestamp,
+                        ticks_per_slot,
                     );
                     sleep(Duration::from_millis(COMPUTE_CONFIRMATION_MS));
                 }
@@ -189,6 +201,7 @@ pub mod tests {
             &bank,
             genesis_block.bootstrap_leader_id,
             &mut last_confirmation_time,
+            1,
         );
 
         // Get another validator to vote, so we now have 2/3 consensus
@@ -200,6 +213,7 @@ pub mod tests {
             &bank,
             genesis_block.bootstrap_leader_id,
             &mut last_confirmation_time,
+            1,
         );
         assert!(last_confirmation_time > 0);
     }