173 lines
6.0 KiB
Rust
173 lines
6.0 KiB
Rust
//! The Epoch Accounts Hash (EAH) is a special hash of the whole accounts state that occurs once
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//! per epoch.
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//!
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//! This hash is special because all nodes in the cluster will calculate the accounts hash at a
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//! predetermined slot in the epoch and then save that result into a later Bank at a predetermined
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//! slot.
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//!
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//! This results in all nodes effectively voting on the accounts state (at least) once per epoch.
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use {
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crate::bank::Bank,
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serde::{Deserialize, Serialize},
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solana_sdk::{
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clock::{Epoch, Slot},
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hash::Hash,
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},
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};
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mod manager;
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pub use manager::Manager as EpochAccountsHashManager;
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/// The EpochAccountsHash holds the result after calculating the accounts hash once per epoch
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#[derive(Debug, Serialize, Deserialize, Hash, PartialEq, Eq, Clone, Copy)]
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pub struct EpochAccountsHash(Hash);
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impl AsRef<Hash> for EpochAccountsHash {
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fn as_ref(&self) -> &Hash {
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&self.0
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}
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}
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impl EpochAccountsHash {
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/// Make an EpochAccountsHash from a regular accounts hash
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#[must_use]
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pub const fn new(accounts_hash: Hash) -> Self {
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Self(accounts_hash)
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}
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}
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/// Calculation of the EAH occurs once per epoch. All nodes in the cluster must agree on which
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/// slot the EAH is based on. This slot will be at an offset into the epoch, and referred to as
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/// the "start" slot for the EAH calculation.
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#[must_use]
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#[inline]
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pub fn calculation_offset_start(bank: &Bank) -> Slot {
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calculation_info(bank).calculation_offset_start
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}
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/// Calculation of the EAH occurs once per epoch. All nodes in the cluster must agree on which
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/// bank will hash the EAH into its `Bank::hash`. This slot will be at an offset into the epoch,
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/// and referred to as the "stop" slot for the EAH calculation. All nodes must complete the EAH
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/// calculation before this slot!
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#[must_use]
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#[inline]
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pub fn calculation_offset_stop(bank: &Bank) -> Slot {
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calculation_info(bank).calculation_offset_stop
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}
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/// For the epoch that `bank` is in, get the slot that the EAH calculation starts
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#[must_use]
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#[inline]
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pub fn calculation_start(bank: &Bank) -> Slot {
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calculation_info(bank).calculation_start
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}
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/// For the epoch that `bank` is in, get the slot that the EAH calculation stops
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#[must_use]
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#[inline]
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pub fn calculation_stop(bank: &Bank) -> Slot {
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calculation_info(bank).calculation_stop
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}
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/// For the epoch that `bank` is in, get all the EAH calculation information
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pub fn calculation_info(bank: &Bank) -> CalculationInfo {
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let epoch = bank.epoch();
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let epoch_schedule = bank.epoch_schedule();
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let slots_per_epoch = epoch_schedule.get_slots_in_epoch(epoch);
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let calculation_offset_start = slots_per_epoch / 4;
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let calculation_offset_stop = slots_per_epoch / 4 * 3;
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let first_slot_in_epoch = epoch_schedule.get_first_slot_in_epoch(epoch);
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let last_slot_in_epoch = epoch_schedule.get_last_slot_in_epoch(epoch);
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let calculation_start = first_slot_in_epoch.saturating_add(calculation_offset_start);
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let calculation_stop = first_slot_in_epoch.saturating_add(calculation_offset_stop);
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CalculationInfo {
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epoch,
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slots_per_epoch,
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first_slot_in_epoch,
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last_slot_in_epoch,
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calculation_offset_start,
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calculation_offset_stop,
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calculation_start,
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calculation_stop,
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}
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}
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/// All the EAH calculation information for a specific epoch
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///
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/// Computing the EAH calculation information looks up a bunch of values. Instead of throwing
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/// those values away, they are kept in here as well. This may aid in future debugging, and the
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/// additional fields are trivial in size.
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#[derive(Debug, Default, Copy, Clone)]
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pub struct CalculationInfo {
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/*
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* The values that were looked up, which were needed to get the calculation info
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*/
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/// The epoch this information applies to
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pub epoch: Epoch,
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/// Number of slots in this epoch
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pub slots_per_epoch: u64,
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/// First slot in this epoch
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pub first_slot_in_epoch: Slot,
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/// Last slot in this epoch
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pub last_slot_in_epoch: Slot,
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/*
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* The computed values for the calculation info
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*/
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/// Offset into the epoch when the EAH calculation starts
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pub calculation_offset_start: Slot,
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/// Offset into the epoch when the EAH calculation stops
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pub calculation_offset_stop: Slot,
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/// Absolute slot where the EAH calculation starts
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pub calculation_start: Slot,
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/// Absolute slot where the EAH calculation stops
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pub calculation_stop: Slot,
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}
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#[cfg(test)]
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mod tests {
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use {
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super::*,
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solana_sdk::{epoch_schedule::EpochSchedule, genesis_config::GenesisConfig},
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};
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#[test]
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fn test_calculation_offset_bounds() {
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let bank = Bank::default_for_tests();
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let offset_start = calculation_offset_start(&bank);
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let offset_stop = calculation_offset_stop(&bank);
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assert!(offset_start < offset_stop);
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}
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#[test]
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fn test_calculation_bounds() {
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let bank = Bank::default_for_tests();
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let start = calculation_start(&bank);
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let stop = calculation_stop(&bank);
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assert!(start < stop);
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}
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#[test]
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fn test_calculation_info() {
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for slots_per_epoch in [32, 100, 65_536, 432_000, 123_456_789] {
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for warmup in [false, true] {
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let genesis_config = GenesisConfig {
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epoch_schedule: EpochSchedule::custom(slots_per_epoch, slots_per_epoch, warmup),
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..GenesisConfig::default()
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};
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let info = calculation_info(&Bank::new_for_tests(&genesis_config));
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assert!(info.calculation_offset_start < info.calculation_offset_stop);
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assert!(info.calculation_offset_start < info.slots_per_epoch);
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assert!(info.calculation_offset_stop < info.slots_per_epoch);
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assert!(info.calculation_start < info.calculation_stop,);
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assert!(info.calculation_start > info.first_slot_in_epoch,);
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assert!(info.calculation_stop < info.last_slot_in_epoch,);
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}
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}
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}
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}
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