diff --git a/core/src/poh_recorder.rs b/core/src/poh_recorder.rs index e5c425e29f8ec9..aa7205dba97934 100644 --- a/core/src/poh_recorder.rs +++ b/core/src/poh_recorder.rs @@ -29,7 +29,7 @@ use std::sync::{Arc, Mutex}; use std::time::Instant; const GRACE_TICKS_FACTOR: u64 = 2; -const MAX_GRACE_SLOTS: u64 = 3; +const MAX_GRACE_SLOTS: u64 = 2; #[derive(Debug, PartialEq, Eq, Clone)] pub enum PohRecorderError { @@ -126,6 +126,33 @@ impl PohRecorder { self.ticks_per_slot } + fn received_any_previous_leader_data(&self, slot: Slot) -> bool { + (slot.saturating_sub(NUM_CONSECUTIVE_LEADER_SLOTS)..slot).any(|i| { + // Check if we have received any data in previous leader's slots + if let Ok(slot_meta) = self.blockstore.meta(i as Slot) { + if let Some(slot_meta) = slot_meta { + slot_meta.received > 0 + } else { + false + } + } else { + false + } + }) + } + + fn reached_leader_tick(&self, leader_first_tick_height: u64) -> bool { + let target_tick_height = leader_first_tick_height.saturating_sub(1); + let ideal_target_tick_height = target_tick_height.saturating_sub(self.grace_ticks); + let current_slot = self.tick_height / self.ticks_per_slot; + // we've approached target_tick_height OR poh was reset to run immediately + // Or, previous leader didn't transmit in any of its leader slots, so ignore grace ticks + self.tick_height >= target_tick_height + || self.start_tick_height + self.grace_ticks == leader_first_tick_height + || (self.tick_height >= ideal_target_tick_height + && !self.received_any_previous_leader_data(current_slot)) + } + /// returns if leader slot has been reached, how many grace ticks were afforded, /// imputed leader_slot and self.start_slot /// reached_leader_slot() == true means "ready for a bank" @@ -143,10 +170,7 @@ impl PohRecorder { let next_leader_slot = (next_tick_height - 1) / self.ticks_per_slot; if let Some(leader_first_tick_height) = self.leader_first_tick_height { let target_tick_height = leader_first_tick_height.saturating_sub(1); - // we've approached target_tick_height OR poh was reset to run immediately - if self.tick_height >= target_tick_height - || self.start_tick_height + self.grace_ticks == leader_first_tick_height - { + if self.reached_leader_tick(leader_first_tick_height) { assert!(next_tick_height >= self.start_tick_height); let ideal_target_tick_height = target_tick_height.saturating_sub(self.grace_ticks); @@ -469,7 +493,8 @@ impl PohRecorder { mod tests { use super::*; use crate::genesis_utils::{create_genesis_config, GenesisConfigInfo}; - use solana_ledger::{blockstore::Blockstore, get_tmp_ledger_path}; + use bincode::serialize; + use solana_ledger::{blockstore::Blockstore, blockstore_meta::SlotMeta, get_tmp_ledger_path}; use solana_perf::test_tx::test_tx; use solana_sdk::clock::DEFAULT_TICKS_PER_SLOT; use solana_sdk::hash::hash; @@ -1088,6 +1113,60 @@ mod tests { Blockstore::destroy(&ledger_path).unwrap(); } + #[test] + fn test_reached_leader_tick() { + solana_logger::setup(); + + let ledger_path = get_tmp_ledger_path!(); + { + let blockstore = Blockstore::open(&ledger_path) + .expect("Expected to be able to open database ledger"); + let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(2); + let bank = Arc::new(Bank::new(&genesis_config)); + let prev_hash = bank.last_blockhash(); + let (mut poh_recorder, _entry_receiver) = PohRecorder::new( + 0, + prev_hash, + 0, + None, + bank.ticks_per_slot(), + &Pubkey::default(), + &Arc::new(blockstore), + &Arc::new(LeaderScheduleCache::new_from_bank(&bank)), + &Arc::new(PohConfig::default()), + ); + + assert_eq!(poh_recorder.reached_leader_tick(0), true); + + let grace_ticks = bank.ticks_per_slot() * MAX_GRACE_SLOTS; + let new_tick_height = NUM_CONSECUTIVE_LEADER_SLOTS * bank.ticks_per_slot(); + for _ in 0..new_tick_height { + poh_recorder.tick(); + } + + poh_recorder.grace_ticks = grace_ticks; + // True, as previous leader did not transmit in its slots + assert_eq!( + poh_recorder.reached_leader_tick(new_tick_height + grace_ticks), + true + ); + + let mut parent_meta = SlotMeta::default(); + parent_meta.received = 1; + poh_recorder + .blockstore + .put_meta_bytes(0, &serialize(&parent_meta).unwrap()) + .unwrap(); + + // False, as previous leader transmitted in one of its recent slots + // and grace ticks have not expired + assert_eq!( + poh_recorder.reached_leader_tick(new_tick_height + grace_ticks), + false + ); + } + } + #[test] fn test_reached_leader_slot() { solana_logger::setup(); @@ -1134,6 +1213,13 @@ mod tests { init_ticks + bank.ticks_per_slot() ); + let mut parent_meta = SlotMeta::default(); + parent_meta.received = 1; + poh_recorder + .blockstore + .put_meta_bytes(0, &serialize(&parent_meta).unwrap()) + .unwrap(); + // Test that we don't reach the leader slot because of grace ticks assert_eq!(poh_recorder.reached_leader_slot().0, false); diff --git a/ledger/src/lib.rs b/ledger/src/lib.rs index c7d2f719044f4b..de2c2047ae601c 100644 --- a/ledger/src/lib.rs +++ b/ledger/src/lib.rs @@ -4,7 +4,7 @@ pub mod block_error; #[macro_use] pub mod blockstore; pub mod blockstore_db; -mod blockstore_meta; +pub mod blockstore_meta; pub mod blockstore_processor; pub mod entry; pub mod erasure;