Correct all fork choice rules for children with no votes.
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3112f83786
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086e9574d2
@ -409,11 +409,23 @@ impl<T: ClientDB + Sized> ForkChoice for BitwiseLMDGhost<T> {
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*child_votes.entry(child).or_insert_with(|| 0) += vote;
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}
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}
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// given the votes on the children, find the best child
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current_head = self
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.choose_best_child(&child_votes)
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.ok_or(ForkChoiceError::CannotFindBestChild)?;
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trace!("Best child found: {}", current_head);
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// check if we have votes of children, if not select the smallest hash child
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if child_votes.is_empty() {
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current_head = *children
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.iter()
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.min_by(|child1, child2| child1.cmp(child2))
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.expect("Must be children here");
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trace!(
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"Children have no votes - smallest hash chosen: {}",
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current_head
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);
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} else {
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// given the votes on the children, find the best child
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current_head = self
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.choose_best_child(&child_votes)
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.ok_or(ForkChoiceError::CannotFindBestChild)?;
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trace!("Best child found: {}", current_head);
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}
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}
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// didn't find head yet, proceed to next iteration
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@ -380,11 +380,23 @@ impl<T: ClientDB + Sized> ForkChoice for OptimizedLMDGhost<T> {
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*child_votes.entry(child).or_insert_with(|| 0) += vote;
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}
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}
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// given the votes on the children, find the best child
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current_head = self
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.choose_best_child(&child_votes)
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.ok_or(ForkChoiceError::CannotFindBestChild)?;
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trace!("Best child found: {}", current_head);
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// check if we have votes of children, if not select the smallest hash child
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if child_votes.is_empty() {
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current_head = *children
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.iter()
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.min_by(|child1, child2| child1.cmp(child2))
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.expect("Must be children here");
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trace!(
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"Children have no votes - smallest hash chosen: {}",
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current_head
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);
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} else {
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// given the votes on the children, find the best child
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current_head = self
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.choose_best_child(&child_votes)
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.ok_or(ForkChoiceError::CannotFindBestChild)?;
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trace!("Best child found: {}", current_head);
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}
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}
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// didn't find head yet, proceed to next iteration
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@ -1 +0,0 @@
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@ -210,6 +210,7 @@ impl<T: ClientDB + Sized> ForkChoice for SlowLMDGhost<T> {
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trace!("Children found: {:?}", children);
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let mut head_vote_count = 0;
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head_hash = children[0];
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for child_hash in children {
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let vote_count = self.get_vote_count(&latest_votes, &child_hash)?;
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trace!("Vote count for child: {} is: {}", child_hash, vote_count);
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@ -218,6 +219,12 @@ impl<T: ClientDB + Sized> ForkChoice for SlowLMDGhost<T> {
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head_hash = *child_hash;
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head_vote_count = vote_count;
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}
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// resolve ties - choose smaller hash
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else if vote_count == head_vote_count {
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if *child_hash < head_hash {
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head_hash = *child_hash;
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}
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}
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}
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}
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Ok(head_hash)
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@ -129,3 +129,16 @@ test_cases:
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- b9: 2
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heads:
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- id: 'b7'
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- blocks:
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- id: 'b0'
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parent: 'b0'
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- id: 'b1'
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parent: 'b0'
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- id: 'b2'
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parent: 'b0'
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weights:
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- b1: 0
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- b2: 0
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heads:
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- id: 'b1'
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@ -51,3 +51,15 @@ test_cases:
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- b3: 6
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heads:
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- id: 'b2'
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- blocks:
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- id: 'b0'
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parent: 'b0'
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- id: 'b1'
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parent: 'b0'
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- id: 'b2'
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parent: 'b0'
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weights:
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- b1: 0
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- b2: 0
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heads:
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- id: 'b1'
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