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Properly filter out duplicate voters in elections. (#6693)

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* Prevent duplicate voter

* Update primitives/npos-elections/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
Kian Paimani
2020-07-21 17:33:33 +02:00
committed by GitHub
parent 3b6597e0ed
commit c9fd0c964a
3 changed files with 159 additions and 0 deletions
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substrate/primitives/npos-elections/src/lib.rs
+4
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@@ -371,6 +371,10 @@ pub fn seq_phragmen<AccountId, R>(
voters.extend(initial_voters.into_iter().map(|(who, voter_stake, votes)| {
let mut edges: Vec<Edge<AccountId>> = Vec::with_capacity(votes.len());
for v in votes {
if edges.iter().any(|e| e.who == v) {
// duplicate edge.
continue;
}
if let Some(idx) = c_idx_cache.get(&v) {
// This candidate is valid + already cached.
candidates[*idx].approval_stake = candidates[*idx].approval_stake