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state_processing: delete get_attestation_participants

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This commit is contained in:
Michael Sproul 2019-05-15 13:18:15 +10:00
parent 3a0f00215d
commit e4bbcd333a
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1 changed files with 0 additions and 38 deletions
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38
eth2/state_processing/src/per_epoch_processing/get_attestation_participants.rs
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@ -1,38 +0,0 @@
use crate::common::verify_bitfield_length;
use types::*;
/// Returns validator indices which participated in the attestation.
///
/// Spec v0.5.1
pub fn get_attestation_participants<T: EthSpec>(
state: &BeaconState<T>,
attestation_data: &AttestationData,
bitfield: &Bitfield,
spec: &ChainSpec,
) -> Result<Vec<usize>, BeaconStateError> {
let epoch = attestation_data.slot.epoch(spec.slots_per_epoch);
let crosslink_committee =
state.get_crosslink_committee_for_shard(epoch, attestation_data.shard, spec)?;
if crosslink_committee.slot != attestation_data.slot {
return Err(BeaconStateError::NoCommitteeForShard);
}
let committee = &crosslink_committee.committee;
if !verify_bitfield_length(&bitfield, committee.len()) {
return Err(BeaconStateError::InvalidBitfield);
}
let mut participants = Vec::with_capacity(committee.len());
for (i, validator_index) in committee.iter().enumerate() {
match bitfield.get(i) {
Ok(bit) if bit => participants.push(*validator_index),
_ => {}
}
}
participants.shrink_to_fit();
Ok(participants)
}