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solana
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Handle edge cases earlier 

We have lots of tests that work off genesis block.  Also, one
might want to generate a future leader schedule under the assumption
the stakers stay the same.
This commit is contained in:
Greg Fitzgerald 2019-02-25 08:43:03 -07:00 committed by Grimes
parent db899a2813
commit 710f88edda
1 changed files with 7 additions and 12 deletions
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19
runtime/src/bank.rs
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@ -685,22 +685,22 @@ impl Bank {
}
/// Return the checkpointed stakes that should be used to generate a leader schedule.
/// Return None if a sufficiently old bank checkpoint doesn't exist.
fn leader_schedule_stakes(&self, epoch_height: u64) -> Option<HashMap<Pubkey, u64>> {
fn leader_schedule_stakes(&self, epoch_height: u64) -> HashMap<Pubkey, u64> {
let epoch_slot_height = epoch_height * self.slots_per_epoch();
let expected = epoch_slot_height.saturating_sub(self.leader_schedule_slot_offset);
if self.slot_height() <= expected {
return self.staked_nodes();
}
self.parents()
.into_iter()
.find(|bank| bank.slot_height() <= expected)
.map(|bank| bank.staked_nodes())
.unwrap()
}
/// Return the leader schedule for the given epoch.
fn leader_schedule(&self, epoch_height: u64) -> LeaderSchedule {
let (stakes, epoch_height) = match self.leader_schedule_stakes(epoch_height) {
None => (self.staked_nodes(), self.epoch_height()),
Some(stakes) => (stakes, epoch_height),
};
let stakes = self.leader_schedule_stakes(epoch_height);
let mut seed = [0u8; 32];
seed[0..8].copy_from_slice(&epoch_height.to_le_bytes());
let stakes: Vec<_> = stakes.into_iter().collect();
@ -1199,8 +1199,6 @@ mod tests {
let bootstrap_tokens = 2;
let (genesis_block, _) = GenesisBlock::new_with_leader(2, pubkey, bootstrap_tokens);
let bank = Bank::new(&genesis_block);
assert!(bank.leader_schedule_stakes(bank.epoch_height()).is_none());
let bank = Bank::new_from_parent(&Arc::new(bank));
let ticks_per_offset = bank.leader_schedule_slot_offset * bank.ticks_per_slot();
register_ticks(&bank, ticks_per_offset);
@ -1209,10 +1207,7 @@ mod tests {
let mut expected = HashMap::new();
expected.insert(pubkey, bootstrap_tokens - 1);
let bank = Bank::new_from_parent(&Arc::new(bank));
assert_eq!(
bank.leader_schedule_stakes(bank.epoch_height()).unwrap(),
expected,
);
assert_eq!(bank.leader_schedule_stakes(bank.epoch_height()), expected,);
}
#[test]