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33 lines
1.0 KiB
Rust
33 lines
1.0 KiB
Rust
use types::*;
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/// Returns validator indices which participated in the attestation, sorted by increasing index.
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pub fn get_attesting_indices<T: EthSpec>(
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committee: &[usize],
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bitlist: &BitList<T::MaxValidatorsPerCommittee>,
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) -> Result<Vec<u64>, BeaconStateError> {
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if bitlist.len() != committee.len() {
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return Err(BeaconStateError::InvalidBitfield);
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}
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let mut indices = Vec::with_capacity(bitlist.num_set_bits());
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for (i, validator_index) in committee.iter().enumerate() {
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if let Ok(true) = bitlist.get(i) {
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indices.push(*validator_index as u64)
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}
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}
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indices.sort_unstable();
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Ok(indices)
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}
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/// Shortcut for getting the attesting indices while fetching the committee from the state's cache.
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pub fn get_attesting_indices_from_state<T: EthSpec>(
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state: &BeaconState<T>,
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att: &Attestation<T>,
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) -> Result<Vec<u64>, BeaconStateError> {
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let committee = state.get_beacon_committee(att.data.slot, att.data.index)?;
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get_attesting_indices::<T>(committee.committee, &att.aggregation_bits)
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}
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