74 lines
2.9 KiB
Rust
74 lines
2.9 KiB
Rust
use super::per_block_processing::{errors::BlockProcessingError, process_deposit};
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use crate::common::get_compact_committees_root;
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use tree_hash::TreeHash;
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use types::typenum::U4294967296;
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use types::*;
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/// Initialize a `BeaconState` from genesis data.
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///
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/// Spec v0.8.0
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// TODO: this is quite inefficient and we probably want to rethink how we do this
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pub fn initialize_beacon_state_from_eth1<T: EthSpec>(
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eth1_block_hash: Hash256,
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eth1_timestamp: u64,
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deposits: Vec<Deposit>,
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spec: &ChainSpec,
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) -> Result<BeaconState<T>, BlockProcessingError> {
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let genesis_time =
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eth1_timestamp - eth1_timestamp % spec.seconds_per_day + 2 * spec.seconds_per_day;
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let eth1_data = Eth1Data {
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// Temporary deposit root
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deposit_root: Hash256::zero(),
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deposit_count: deposits.len() as u64,
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block_hash: eth1_block_hash,
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};
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let mut state = BeaconState::new(genesis_time, eth1_data, spec);
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// Process deposits
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let leaves: Vec<_> = deposits
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.iter()
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.map(|deposit| deposit.data.clone())
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.collect();
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for (index, deposit) in deposits.into_iter().enumerate() {
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let deposit_data_list = VariableList::<_, U4294967296>::from(leaves[..=index].to_vec());
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state.eth1_data.deposit_root = Hash256::from_slice(&deposit_data_list.tree_hash_root());
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process_deposit(&mut state, &deposit, spec, true)?;
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}
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// Process activations
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for (index, validator) in state.validators.iter_mut().enumerate() {
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let balance = state.balances[index];
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validator.effective_balance = std::cmp::min(
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balance - balance % spec.effective_balance_increment,
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spec.max_effective_balance,
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);
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if validator.effective_balance == spec.max_effective_balance {
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validator.activation_eligibility_epoch = T::genesis_epoch();
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validator.activation_epoch = T::genesis_epoch();
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}
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}
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// Now that we have our validators, initialize the caches (including the committees)
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state.build_all_caches(spec)?;
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// Populate active_index_roots and compact_committees_roots
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let indices_list = VariableList::<usize, T::ValidatorRegistryLimit>::from(
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state.get_active_validator_indices(T::genesis_epoch()),
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);
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let active_index_root = Hash256::from_slice(&indices_list.tree_hash_root());
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let committee_root = get_compact_committees_root(&state, RelativeEpoch::Current, spec)?;
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state.fill_active_index_roots_with(active_index_root);
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state.fill_compact_committees_roots_with(committee_root);
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Ok(state)
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}
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/// Determine whether a candidate genesis state is suitable for starting the chain.
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///
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/// Spec v0.8.1
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pub fn is_valid_genesis_state<T: EthSpec>(state: &BeaconState<T>, spec: &ChainSpec) -> bool {
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state.genesis_time >= spec.min_genesis_time
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&& state.get_active_validator_indices(T::genesis_epoch()).len() as u64
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>= spec.min_genesis_active_validator_count
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}
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