v2.0: Store epoch in MaxAge (backport of #3485) (#3501)

* Store epoch in MaxAge (#3485)

(cherry picked from commit 5a6f518)

# Conflicts:
#	core/src/banking_stage/consumer.rs
#	core/src/banking_stage/scheduler_messages.rs
#	core/src/banking_stage/transaction_scheduler/transaction_state.rs
#	core/src/banking_stage/transaction_scheduler/transaction_state_container.rs

* resolve conflicts

---------

Co-authored-by: Andrew Fitzgerald <[email protected]>

core/src/banking_stage/consume_worker.rs

@@ -762,7 +762,12 @@ mod tests {
             ..
         } = create_slow_genesis_config(10_000);
         let (bank, bank_forks) = Bank::new_no_wallclock_throttle_for_tests(&genesis_config);
-        let bank = Arc::new(Bank::new_from_parent(bank, &Pubkey::new_unique(), 1));
+        // Warp to next epoch for MaxAge tests.
+        let bank = Arc::new(Bank::new_from_parent(
+            bank.clone(),
+            &Pubkey::new_unique(),
+            bank.get_epoch_info().slots_in_epoch,
+        ));
 
         let ledger_path = get_tmp_ledger_path_auto_delete!();
         let blockstore = Blockstore::open(ledger_path.path())
@@ -842,7 +847,7 @@ mod tests {
         let bid = TransactionBatchId::new(0);
         let id = TransactionId::new(0);
         let max_age = MaxAge {
-            epoch_invalidation_slot: bank.slot(),
+            sanitized_epoch: bank.epoch(),
             alt_invalidation_slot: bank.slot(),
         };
         let work = ConsumeWork {
@@ -891,7 +896,7 @@ mod tests {
         let bid = TransactionBatchId::new(0);
         let id = TransactionId::new(0);
         let max_age = MaxAge {
-            epoch_invalidation_slot: bank.slot(),
+            sanitized_epoch: bank.epoch(),
             alt_invalidation_slot: bank.slot(),
         };
         let work = ConsumeWork {
@@ -941,7 +946,7 @@ mod tests {
         let id1 = TransactionId::new(1);
         let id2 = TransactionId::new(0);
         let max_age = MaxAge {
-            epoch_invalidation_slot: bank.slot(),
+            sanitized_epoch: bank.epoch(),
             alt_invalidation_slot: bank.slot(),
         };
         consume_sender
@@ -1002,7 +1007,7 @@ mod tests {
         let id1 = TransactionId::new(1);
         let id2 = TransactionId::new(0);
         let max_age = MaxAge {
-            epoch_invalidation_slot: bank.slot(),
+            sanitized_epoch: bank.epoch(),
             alt_invalidation_slot: bank.slot(),
         };
         consume_sender
@@ -1056,6 +1061,7 @@ mod tests {
             .unwrap()
             .set_bank_for_test(bank.clone());
         assert!(bank.slot() > 0);
+        assert!(bank.epoch() > 0);
 
         // No conflicts between transactions. Test 6 cases.
         // 1. Epoch expiration, before slot => still succeeds due to resanitizing
@@ -1140,27 +1146,27 @@ mod tests {
                 transactions: txs,
                 max_ages: vec![
                     MaxAge {
-                        epoch_invalidation_slot: bank.slot() - 1,
+                        sanitized_epoch: bank.epoch() - 1,
                         alt_invalidation_slot: Slot::MAX,
                     },
                     MaxAge {
-                        epoch_invalidation_slot: bank.slot(),
+                        sanitized_epoch: bank.epoch(),
                         alt_invalidation_slot: Slot::MAX,
                     },
                     MaxAge {
-                        epoch_invalidation_slot: bank.slot() + 1,
+                        sanitized_epoch: bank.epoch() + 1,
                         alt_invalidation_slot: Slot::MAX,
                     },
                     MaxAge {
-                        epoch_invalidation_slot: u64::MAX,
+                        sanitized_epoch: bank.epoch(),
                         alt_invalidation_slot: bank.slot() - 1,
                     },
                     MaxAge {
-                        epoch_invalidation_slot: u64::MAX,
+                        sanitized_epoch: bank.epoch(),
                         alt_invalidation_slot: bank.slot(),
                     },
                     MaxAge {
-                        epoch_invalidation_slot: u64::MAX,
+                        sanitized_epoch: bank.epoch(),
                         alt_invalidation_slot: bank.slot() + 1,
                     },
                 ],

core/src/banking_stage/consumer.rs

@@ -448,7 +448,7 @@ impl Consumer {
         // This means that the transaction may cross and epoch boundary (not allowed),
         //  or account lookup tables may have been closed.
         let pre_results = txs.iter().zip(max_ages).map(|(tx, max_age)| {
-            if bank.slot() > max_age.epoch_invalidation_slot {
+            if bank.epoch() != max_age.sanitized_epoch {
                 // Epoch has rolled over. Need to fully re-verify the transaction.
                 // Pre-compiles are verified here.
                 // Attempt re-sanitization after epoch-cross.

core/src/banking_stage/scheduler_messages.rs

@@ -1,6 +1,9 @@
 use {
     super::immutable_deserialized_packet::ImmutableDeserializedPacket,
-    solana_sdk::{clock::Slot, transaction::SanitizedTransaction},
+    solana_sdk::{
+        clock::{Epoch, Slot},
+        transaction::SanitizedTransaction,
+    },
     std::{fmt::Display, sync::Arc},
 };
 
@@ -38,10 +41,17 @@ impl Display for TransactionId {
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct MaxAge {
-    pub epoch_invalidation_slot: Slot,
+    pub sanitized_epoch: Epoch,
     pub alt_invalidation_slot: Slot,
 }
 
+impl MaxAge {
+    pub const MAX: Self = Self {
+        sanitized_epoch: Epoch::MAX,
+        alt_invalidation_slot: Slot::MAX,
+    };
+}
+
 /// Message: [Scheduler -> Worker]
 /// Transactions to be consumed (i.e. executed, recorded, and committed)
 pub struct ConsumeWork {

core/src/banking_stage/transaction_scheduler/prio_graph_scheduler.rs

@@ -588,8 +588,8 @@ mod tests {
         crossbeam_channel::{unbounded, Receiver},
         itertools::Itertools,
         solana_sdk::{
-            clock::Slot, compute_budget::ComputeBudgetInstruction, hash::Hash, message::Message,
-            packet::Packet, pubkey::Pubkey, signature::Keypair, signer::Signer, system_instruction,
+            compute_budget::ComputeBudgetInstruction, hash::Hash, message::Message, packet::Packet,
+            pubkey::Pubkey, signature::Keypair, signer::Signer, system_instruction,
             transaction::Transaction,
         },
         std::{borrow::Borrow, sync::Arc},
@@ -675,10 +675,7 @@ mod tests {
             );
             let transaction_ttl = SanitizedTransactionTTL {
                 transaction,
-                max_age: MaxAge {
-                    epoch_invalidation_slot: Slot::MAX,
-                    alt_invalidation_slot: Slot::MAX,
-                },
+                max_age: MaxAge::MAX,
             };
             const TEST_TRANSACTION_COST: u64 = 5000;
             container.insert_new_transaction(

core/src/banking_stage/transaction_scheduler/scheduler_controller.rs

@@ -30,7 +30,7 @@ use {
     solana_sdk::{
         self,
         address_lookup_table::state::estimate_last_valid_slot,
-        clock::{Slot, FORWARD_TRANSACTIONS_TO_LEADER_AT_SLOT_OFFSET, MAX_PROCESSING_AGE},
+        clock::{Epoch, Slot, FORWARD_TRANSACTIONS_TO_LEADER_AT_SLOT_OFFSET, MAX_PROCESSING_AGE},
         fee::FeeBudgetLimits,
         saturating_add_assign,
         transaction::SanitizedTransaction,
@@ -506,9 +506,7 @@ impl SchedulerController {
             (root_bank, working_bank)
         };
         let alt_resolved_slot = root_bank.slot();
-        let last_slot_in_epoch = working_bank
-            .epoch_schedule()
-            .get_last_slot_in_epoch(working_bank.epoch());
+        let sanitized_epoch = root_bank.epoch();
         let transaction_account_lock_limit = working_bank.get_transaction_account_lock_limit();
         let vote_only = working_bank.vote_only_bank();
 
@@ -531,7 +529,7 @@ impl SchedulerController {
                         .build_sanitized_transaction(
                             vote_only,
                             root_bank.as_ref(),
-                            working_bank.get_reserved_account_keys(),
+                            root_bank.get_reserved_account_keys(),
                         )
                         .map(|(tx, deactivation_slot)| (packet.clone(), tx, deactivation_slot))
                 })
@@ -554,7 +552,7 @@ impl SchedulerController {
                     arc_packets.push(packet);
                     transactions.push(tx);
                     max_ages.push(calculate_max_age(
-                        last_slot_in_epoch,
+                        sanitized_epoch,
                         deactivation_slot,
                         alt_resolved_slot,
                     ));
@@ -680,11 +678,10 @@ impl SchedulerController {
     }
 }
 
-/// Given the last slot in the epoch, the minimum deactivation slot,
-/// and the current slot, return the `MaxAge` that should be used for
-/// the transaction. This is used to determine the maximum slot that a
-/// transaction will be considered valid for, without re-resolving addresses
-/// or resanitizing.
+/// Given the epoch, the minimum deactivation slot, and the current slot,
+/// return the `MaxAge` that should be used for the transaction. This is used
+/// to determine the maximum slot that a transaction will be considered valid
+/// for, without re-resolving addresses or resanitizing.
 ///
 /// This function considers the deactivation period of Address Table
 /// accounts. If the deactivation period runs past the end of the epoch,
@@ -697,13 +694,13 @@ impl SchedulerController {
 /// period, i.e. the transaction's address lookups are valid until
 /// AT LEAST this slot.
 fn calculate_max_age(
-    last_slot_in_epoch: Slot,
+    sanitized_epoch: Epoch,
     deactivation_slot: Slot,
     current_slot: Slot,
 ) -> MaxAge {
     let alt_min_expire_slot = estimate_last_valid_slot(deactivation_slot.min(current_slot));
     MaxAge {
-        epoch_invalidation_slot: last_slot_in_epoch,
+        sanitized_epoch,
         alt_invalidation_slot: alt_min_expire_slot,
     }
 }
@@ -1213,23 +1210,23 @@ mod tests {
     #[test]
     fn test_calculate_max_age() {
         let current_slot = 100;
-        let last_slot_in_epoch = 1000;
+        let sanitized_epoch = 10;
 
         // ALT deactivation slot is delayed
         assert_eq!(
-            calculate_max_age(last_slot_in_epoch, current_slot - 1, current_slot),
+            calculate_max_age(sanitized_epoch, current_slot - 1, current_slot),
             MaxAge {
-                epoch_invalidation_slot: last_slot_in_epoch,
+                sanitized_epoch,
                 alt_invalidation_slot: current_slot - 1
                     + solana_sdk::slot_hashes::get_entries() as u64,
             }
         );
 
         // no deactivation slot
         assert_eq!(
-            calculate_max_age(last_slot_in_epoch, u64::MAX, current_slot),
+            calculate_max_age(sanitized_epoch, u64::MAX, current_slot),
             MaxAge {
-                epoch_invalidation_slot: last_slot_in_epoch,
+                sanitized_epoch,
                 alt_invalidation_slot: current_slot + solana_sdk::slot_hashes::get_entries() as u64,
             }
         );

core/src/banking_stage/transaction_scheduler/transaction_state.rs

@@ -209,9 +209,8 @@ mod tests {
     use {
         super::*,
         solana_sdk::{
-            clock::Slot, compute_budget::ComputeBudgetInstruction, hash::Hash, message::Message,
-            packet::Packet, signature::Keypair, signer::Signer, system_instruction,
-            transaction::Transaction,
+            compute_budget::ComputeBudgetInstruction, hash::Hash, message::Message, packet::Packet,
+            signature::Keypair, signer::Signer, system_instruction, transaction::Transaction,
         },
     };
 
@@ -233,10 +232,7 @@ mod tests {
         );
         let transaction_ttl = SanitizedTransactionTTL {
             transaction: SanitizedTransaction::from_transaction_for_tests(tx),
-            max_age: MaxAge {
-                epoch_invalidation_slot: Slot::MAX,
-                alt_invalidation_slot: Slot::MAX,
-            },
+            max_age: MaxAge::MAX,
         };
         const TEST_TRANSACTION_COST: u64 = 5000;
         TransactionState::new(
@@ -327,13 +323,7 @@ mod tests {
             transaction_state,
             TransactionState::Unprocessed { .. }
         ));
-        assert_eq!(
-            transaction_ttl.max_age,
-            MaxAge {
-                epoch_invalidation_slot: Slot::MAX,
-                alt_invalidation_slot: Slot::MAX,
-            }
-        );
+        assert_eq!(transaction_ttl.max_age, MaxAge::MAX);
 
         let _ = transaction_state.transition_to_pending();
         assert!(matches!(
@@ -351,13 +341,7 @@ mod tests {
             transaction_state,
             TransactionState::Unprocessed { .. }
         ));
-        assert_eq!(
-            transaction_ttl.max_age,
-            MaxAge {
-                epoch_invalidation_slot: Slot::MAX,
-                alt_invalidation_slot: Slot::MAX,
-            }
-        );
+        assert_eq!(transaction_ttl.max_age, MaxAge::MAX);
 
         // ensure transaction_ttl is not lost through state transitions
         let transaction_ttl = transaction_state.transition_to_pending();
@@ -372,12 +356,6 @@ mod tests {
             transaction_state,
             TransactionState::Unprocessed { .. }
         ));
-        assert_eq!(
-            transaction_ttl.max_age,
-            MaxAge {
-                epoch_invalidation_slot: Slot::MAX,
-                alt_invalidation_slot: Slot::MAX,
-            }
-        );
+        assert_eq!(transaction_ttl.max_age, MaxAge::MAX);
     }
 }

core/src/banking_stage/transaction_scheduler/transaction_state_container.rs

@@ -161,7 +161,6 @@ mod tests {
             packet::Packet,
             signature::Keypair,
             signer::Signer,
-            slot_history::Slot,
             system_instruction,
             transaction::{SanitizedTransaction, Transaction},
         },
@@ -199,10 +198,7 @@ mod tests {
         );
         let transaction_ttl = SanitizedTransactionTTL {
             transaction: tx,
-            max_age: MaxAge {
-                epoch_invalidation_slot: Slot::MAX,
-                alt_invalidation_slot: Slot::MAX,
-            },
+            max_age: MaxAge::MAX,
         };
         const TEST_TRANSACTION_COST: u64 = 5000;
         (transaction_ttl, packet, priority, TEST_TRANSACTION_COST)