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Add state roots iter to store

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This commit is contained in:
Paul Hauner
2019-06-19 01:47:21 +10:00
parent 2b5c70711d
commit 952e08ba38
2 changed files with 154 additions and 18 deletions
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16
eth2/types/src/beacon_state.rs
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@@ -569,7 +569,7 @@ impl<T: EthSpec> BeaconState<T> {
///
/// Spec v0.6.3
fn get_latest_state_roots_index(&self, slot: Slot) -> Result<usize, Error> {
if (slot < self.slot) && (self.slot <= slot + self.latest_state_roots.len() as u64) {
if (slot < self.slot) && (self.slot <= slot + Slot::from(self.latest_state_roots.len())) {
Ok(slot.as_usize() % self.latest_state_roots.len())
} else {
Err(BeaconStateError::SlotOutOfBounds)
@@ -579,11 +579,23 @@ impl<T: EthSpec> BeaconState<T> {
/// Gets the state root for some slot.
///
/// Spec v0.6.3
pub fn get_state_root(&mut self, slot: Slot) -> Result<&Hash256, Error> {
pub fn get_state_root(&self, slot: Slot) -> Result<&Hash256, Error> {
let i = self.get_latest_state_roots_index(slot)?;
Ok(&self.latest_state_roots[i])
}
/// Gets the oldest (earliest slot) state root.
///
/// Spec v0.5.1
pub fn get_oldest_state_root(&self) -> Result<&Hash256, Error> {
let lookback = std::cmp::min(
self.slot - Slot::from(self.latest_state_roots.len()),
self.slot,
);
let i = self.get_latest_state_roots_index(self.slot - lookback)?;
Ok(&self.latest_state_roots[i])
}
/// Sets the latest state root for slot.
///
/// Spec v0.6.3