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Fix bug in eth1 voting

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This commit is contained in:
Paul Hauner
2019-11-26 14:41:43 +11:00
parent 581a46fd1c
commit 4d4edda230
1 changed files with 6 additions and 4 deletions
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10
beacon_node/beacon_chain/src/eth1_chain.rs
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@@ -301,12 +301,14 @@ fn eth1_block_hash_at_start_of_voting_period<T: EthSpec, S: Store>(
) -> Result<Hash256, Error> { ) -> Result<Hash256, Error> {
let period = T::SlotsPerEth1VotingPeriod::to_u64(); let period = T::SlotsPerEth1VotingPeriod::to_u64();
// Find `state.eth1_data.block_hash` for the state at the start of the voting period. if (state.eth1_data_votes.len() as u64) < period / 2 {
if state.slot % period < period / 2 { // If there are less than 50% of the votes in the current state, it's impossible that the
// When the state is less than half way through the period we can safely assume that // `eth1_data.block_hash` has changed from the value at `state.eth1_data.block_hash`.
// the eth1_data has not changed since the start of the period.
Ok(state.eth1_data.block_hash) Ok(state.eth1_data.block_hash)
} else { } else {
// If there have been more than 50% of votes in this period it's possible (but not
// necessary) that the `state.eth1_data.block_hash` has been changed since the start of the
// voting period.
let slot = (state.slot / period) * period; let slot = (state.slot / period) * period;
let prev_state_root = state let prev_state_root = state
.get_state_root(slot) .get_state_root(slot)