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Offline/Slashing improvements (#1665)

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* Initial logic

* Fix tests

* Don't punish at all when everyone skipped

* Typo

* Fix tests.

* Update srml/aura/src/lib.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Simplification.

* Bump runtime verions
This commit is contained in:
Gav Wood
2019-02-05 22:11:40 +01:00
committed by GitHub
parent 471b7431bc
commit 0eeef28382
6 changed files with 46 additions and 31 deletions
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substrate/srml/aura/src/lib.rs
+7 -22
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@@ -152,28 +152,13 @@ impl AuraReport {
pub fn punish<F>(&self, validator_count: usize, mut punish_with: F)
where F: FnMut(usize, usize)
{
let start_slot = self.start_slot % validator_count;
// the number of times everyone was skipped.
let skipped_all = self.skipped / validator_count;
// the number of validators who were skipped once after that.
let skipped_after = self.skipped % validator_count;
let iter = (start_slot..validator_count).into_iter()
.chain(0..start_slot)
.enumerate();
for (rel_index, actual_index) in iter {
let slash_count = skipped_all + if rel_index < skipped_after {
1
} else {
// avoid iterating over all authorities when skipping a couple.
if skipped_all == 0 { break }
0
};
if slash_count > 0 {
punish_with(actual_index, slash_count);
// If all validators have been skipped, then it implies some sort of
// systematic problem common to all rather than a minority of validators
// unfulfilling their specific duties. In this case, it doesn't make
// sense to punish anyone, so we guard against it.
if self.skipped < validator_count {
for index in 0..self.skipped {
punish_with((self.start_slot + index) % validator_count, 1);
}
}
}