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use {
crate::leader_schedule::LeaderSchedule,
solana_runtime::bank::Bank,
solana_sdk::{
clock::{Epoch, Slot, NUM_CONSECUTIVE_LEADER_SLOTS},
pubkey::Pubkey,
},
std::collections::HashMap,
};
pub fn leader_schedule(epoch: Epoch, bank: &Bank) -> Option<LeaderSchedule> {
bank.epoch_staked_nodes(epoch).map(|stakes| {
let mut seed = [0u8; 32];
seed[0..8].copy_from_slice(&epoch.to_le_bytes());
let mut stakes: Vec<_> = stakes
.iter()
.map(|(pubkey, stake)| (*pubkey, *stake))
.collect();
sort_stakes(&mut stakes);
LeaderSchedule::new(
&stakes,
seed,
bank.get_slots_in_epoch(epoch),
NUM_CONSECUTIVE_LEADER_SLOTS,
)
})
}
pub type LeaderScheduleByIdentity = HashMap<String, Vec<usize>>;
pub fn leader_schedule_by_identity<'a>(
upcoming_leaders: impl Iterator<Item = (usize, &'a Pubkey)>,
) -> LeaderScheduleByIdentity {
let mut leader_schedule_by_identity = HashMap::new();
for (slot_index, identity_pubkey) in upcoming_leaders {
leader_schedule_by_identity
.entry(identity_pubkey)
.or_insert_with(Vec::new)
.push(slot_index);
}
leader_schedule_by_identity
.into_iter()
.map(|(identity_pubkey, slot_indices)| (identity_pubkey.to_string(), slot_indices))
.collect()
}
pub fn slot_leader_at(slot: Slot, bank: &Bank) -> Option<Pubkey> {
let (epoch, slot_index) = bank.get_epoch_and_slot_index(slot);
leader_schedule(epoch, bank).map(|leader_schedule| leader_schedule[slot_index])
}
pub fn num_ticks_left_in_slot(bank: &Bank, tick_height: u64) -> u64 {
bank.ticks_per_slot() - tick_height % bank.ticks_per_slot()
}
fn sort_stakes(stakes: &mut Vec<(Pubkey, u64)>) {
stakes.sort_unstable_by(|(l_pubkey, l_stake), (r_pubkey, r_stake)| {
if r_stake == l_stake {
r_pubkey.cmp(l_pubkey)
} else {
r_stake.cmp(l_stake)
}
});
stakes.dedup();
}
#[cfg(test)]
mod tests {
use {
super::*,
solana_runtime::genesis_utils::{
bootstrap_validator_stake_lamports, create_genesis_config_with_leader,
},
};
#[test]
fn test_leader_schedule_via_bank() {
let pubkey = solana_sdk::pubkey::new_rand();
let genesis_config =
create_genesis_config_with_leader(0, &pubkey, bootstrap_validator_stake_lamports())
.genesis_config;
let bank = Bank::new_for_tests(&genesis_config);
let pubkeys_and_stakes: Vec<_> = bank
.staked_nodes()
.iter()
.map(|(pubkey, stake)| (*pubkey, *stake))
.collect();
let seed = [0u8; 32];
let leader_schedule = LeaderSchedule::new(
&pubkeys_and_stakes,
seed,
genesis_config.epoch_schedule.slots_per_epoch,
NUM_CONSECUTIVE_LEADER_SLOTS,
);
assert_eq!(leader_schedule[0], pubkey);
assert_eq!(leader_schedule[1], pubkey);
assert_eq!(leader_schedule[2], pubkey);
}
#[test]
fn test_leader_scheduler1_basic() {
let pubkey = solana_sdk::pubkey::new_rand();
let genesis_config =
create_genesis_config_with_leader(42, &pubkey, bootstrap_validator_stake_lamports())
.genesis_config;
let bank = Bank::new_for_tests(&genesis_config);
assert_eq!(slot_leader_at(bank.slot(), &bank).unwrap(), pubkey);
}
#[test]
fn test_sort_stakes_basic() {
let pubkey0 = solana_sdk::pubkey::new_rand();
let pubkey1 = solana_sdk::pubkey::new_rand();
let mut stakes = vec![(pubkey0, 1), (pubkey1, 2)];
sort_stakes(&mut stakes);
assert_eq!(stakes, vec![(pubkey1, 2), (pubkey0, 1)]);
}
#[test]
fn test_sort_stakes_with_dup() {
let pubkey0 = solana_sdk::pubkey::new_rand();
let pubkey1 = solana_sdk::pubkey::new_rand();
let mut stakes = vec![(pubkey0, 1), (pubkey1, 2), (pubkey0, 1)];
sort_stakes(&mut stakes);
assert_eq!(stakes, vec![(pubkey1, 2), (pubkey0, 1)]);
}
#[test]
fn test_sort_stakes_with_equal_stakes() {
let pubkey0 = Pubkey::default();
let pubkey1 = solana_sdk::pubkey::new_rand();
let mut stakes = vec![(pubkey0, 1), (pubkey1, 1)];
sort_stakes(&mut stakes);
assert_eq!(stakes, vec![(pubkey1, 1), (pubkey0, 1)]);
}
}