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Add drop_cache fn to BeaconState

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Permits clearing an epoch cache.
This commit is contained in:
Paul Hauner 2019-02-26 20:18:20 +13:00
parent f82c4268e2
commit 931da13545
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GPG Key ID: 303E4494BB28068C
1 changed files with 7 additions and 3 deletions
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10
eth2/types/src/beacon_state.rs
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@ -290,14 +290,18 @@ impl BeaconState {
/// -- `Next` epoch is always _without_ a registry change. If you perform a registry update, /// -- `Next` epoch is always _without_ a registry change. If you perform a registry update,
/// you should rebuild the `Current` cache so it uses the new seed. /// you should rebuild the `Current` cache so it uses the new seed.
pub fn advance_caches(&mut self) { pub fn advance_caches(&mut self) {
let previous_cache_index = self.cache_index(RelativeEpoch::Previous); self.drop_cache(RelativeEpoch::Previous);
self.caches[previous_cache_index] = EpochCache::empty();
self.cache_index_offset += 1; self.cache_index_offset += 1;
self.cache_index_offset %= CACHED_EPOCHS; self.cache_index_offset %= CACHED_EPOCHS;
} }
/// Removes the specified cache and sets it to uninitialized.
pub fn drop_cache(&mut self, relative_epoch: RelativeEpoch) {
let previous_cache_index = self.cache_index(relative_epoch);
self.caches[previous_cache_index] = EpochCache::empty();
}
/// Returns the index of `self.caches` for some `RelativeEpoch`. /// Returns the index of `self.caches` for some `RelativeEpoch`.
fn cache_index(&self, relative_epoch: RelativeEpoch) -> usize { fn cache_index(&self, relative_epoch: RelativeEpoch) -> usize {
let base_index = match relative_epoch { let base_index = match relative_epoch {