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Add clarifying comment to forward_vote (#38)

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Giacomo Pasini 2023-11-02 10:40:30 +01:00 committed by GitHub
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6
carnot/carnot.py
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@ -392,6 +392,12 @@ class Carnot:
return Send(to=self.overlay.parent_committee(self.id), payload=vote) return Send(to=self.overlay.parent_committee(self.id), payload=vote)
def forward_vote(self, vote: Vote) -> Optional[Event]: def forward_vote(self, vote: Vote) -> Optional[Event]:
"""
Recall that for the leader to propose a block it's necessary to have a threshold of the top three committees
votes. In case part of the root committee is malicious and does not vote, the leader might not reach this threshold
even though more than 2/3 of the total nodes voted in favor if nodes stop sending votes after the threshold.
By forwarding votes from children (only the root committee does this), we can improve liveness in this case.
"""
assert vote.block in self.safe_blocks assert vote.block in self.safe_blocks
assert self.overlay.is_member_of_child_committee(self.id, vote.voter) assert self.overlay.is_member_of_child_committee(self.id, vote.voter)
# we only forward votes after we've voted ourselves # we only forward votes after we've voted ourselves