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Ignore attestations to zero hash

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This commit is contained in:
Paul Hauner 2019-06-15 19:11:02 -04:00
parent f4621a9f1a
commit 1128de535d
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1 changed files with 22 additions and 8 deletions
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30
beacon_node/beacon_chain/src/fork_choice.rs
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@ -103,15 +103,29 @@ impl<T: BeaconChainTypes> ForkChoice<T> {
let block_hash = attestation.data.target_root;
// TODO: what happens when the target root is not the same slot as the block?
let block_slot = attestation
.data
.target_epoch
.start_slot(T::EthSpec::slots_per_epoch());
// Ignore any attestations to the zero hash.
//
// This is an edge case that results from the spec aliasing the zero hash to the genesis
// block. Attesters may attest to the zero hash if they have never seen a block.
//
// We have two options here:
//
// 1. Apply all zero-hash attestations to the zero hash.
// 2. Ignore all attestations to the zero hash.
//
// (1) becomes weird once we hit finality and fork choice drops the genesis block. (2) is
// fine becuase votes to the genesis block are not usefully, all validators already
// implicitly attest to genesis just by being present in the chain.
if block_hash != Hash256::zero() {
let block_slot = attestation
.data
.target_epoch
.start_slot(T::EthSpec::slots_per_epoch());
for validator_index in validator_indices {
self.backend
.process_message(validator_index, block_hash, block_slot)?;
for validator_index in validator_indices {
self.backend
.process_message(validator_index, block_hash, block_slot)?;
}
}
Ok(())