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Improve BeaconState safe accessors

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And fix a bug in the compact committees accessor.
This commit is contained in:
Michael Sproul
2019-08-19 16:15:55 +10:00
parent 0c3fdcd57c
commit 5a7903a377
2 changed files with 81 additions and 68 deletions
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45
eth2/state_processing/src/per_epoch_processing.rs
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@@ -221,42 +221,29 @@ pub fn process_final_updates<T: EthSpec>(
// Update start shard.
state.start_shard = state.next_epoch_start_shard(spec)?;
// This is a hack to allow us to update index roots and slashed balances for the next epoch.
//
// The indentation here is to make it obvious where the weird stuff happens.
{
state.slot += 1;
// Set active index root
let index_epoch = next_epoch + spec.activation_exit_delay;
let indices_list = VariableList::<usize, T::ValidatorRegistryLimit>::from(
state.get_active_validator_indices(index_epoch),
);
state.set_active_index_root(
index_epoch,
Hash256::from_slice(&indices_list.tree_hash_root()),
spec,
)?;
// Reset slashings
state.set_slashings(next_epoch, 0)?;
// Set randao mix
state.set_randao_mix(next_epoch, *state.get_randao_mix(current_epoch)?)?;
state.slot -= 1;
}
// Set active index root
let index_epoch = next_epoch + spec.activation_exit_delay;
let indices_list = VariableList::<usize, T::ValidatorRegistryLimit>::from(
state.get_active_validator_indices(index_epoch),
);
state.set_active_index_root(
index_epoch,
Hash256::from_slice(&indices_list.tree_hash_root()),
spec,
)?;
// Set committees root
// Note: we do this out-of-order w.r.t. to the spec, because we don't want the slot to be
// incremented. It's safe because the updates to slashings and the RANDAO mix (above) don't
// affect this.
state.set_compact_committee_root(
next_epoch,
get_compact_committees_root(state, RelativeEpoch::Next, spec)?,
spec,
)?;
// Reset slashings
state.set_slashings(next_epoch, 0)?;
// Set randao mix
state.set_randao_mix(next_epoch, *state.get_randao_mix(current_epoch)?)?;
// Set historical root accumulator
if next_epoch.as_u64() % (T::SlotsPerHistoricalRoot::to_u64() / T::slots_per_epoch()) == 0 {
let historical_batch = state.historical_batch();