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Allow slashing only on current era#3411
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tomusdrw merged 4 commits intoretreat-slashingfrom Aug 16, 2019
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pepyakin
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Aug 15, 2019
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| /// Filter historical offences out and only allow those from the current era. | ||
| pub struct FilterHistoricalOffences<T, R> { |
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Why not hook it up in node-runtime right away?
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I wanted to, but I didn't see that ReportOffence was used anywhere
tomusdrw
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Aug 16, 2019
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Looks sensible to me, left couple of questions though.
| // otherwise, these funds may have already been slashed due to something | ||
| // reported from a prior era. | ||
| let already_slashed_own = journal.iter() | ||
| .filter(|entry| &entry.who == stash) |
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I suppose stash does not change, right? You can't move to another stash account without unbonding/bonding?
| let current_era = CurrentEra::mutate(|s| { *s += 1; *s }); | ||
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| // prune journal for last era. | ||
| <EraSlashJournal<T>>::remove(current_era - 1); |
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Couldn't we prune era's with some offset (X) and accept reports for last X eras?
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We could, but it wouldn't be of any use with this runtime. Historical slashing just isn't doable without more work beyond this milestone.
gavofyork
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Aug 16, 2019
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@rphmeier just waiting on answers to the final queries before i can merge this. |
tomusdrw
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Aug 16, 2019
pepyakin
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Aug 16, 2019
gavofyork
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Aug 16, 2019
* Remove offline slashing logic from staking. * Initial version of reworked offence module, can report offences * Clean up staking example. * Commit SlashingOffence * Force new era on slash. * Add offenders in the SlashingOffence trait. * Introduce the ReportOffence trait. * Rename `Offence`. * Add on_before_session_ending handler. * Move offence related stuff under sr-primitives. * Fix cargo check. * Import new im-online implementation. * Adding validator count to historical session storage as it's needed for slash calculations * Add a comment about offence. * Add BabeEquivocationOffence * GrandpaEquivocationOffence * slash_fraction and fix * current_era_start_session_index * UnresponsivnessOffence * Finalise OnOffenceHandler traits, and stub impl for staking. * slash_fraction doesn't really need &self * Note that offenders count is greater than 0 * Add a test to ensure that I got the math right * Use FullIdentification in offences. * Use FullIndentification. * Hook up the offences module. * Report unresponsive validators * Make sure eras have the same length. * Slashing and rewards. * Fix compilation. * Distribute rewards. * Supply validators_count * Use identificationTuple in Unresponsivness report * Fix merge. * Make sure we don't slash if amount is zero. * We don't return an error from report_offence anymo * We actually can use vec! * Prevent division by zero if the reporters is empty * offence_forces_new_era/nominators_also_get_slashed * advance_session * Fix tests. * Update srml/staking/src/lib.rs Co-Authored-By: Robert Habermeier <rphmeier@gmail.com> * slashing_performed_according_exposure * Check that reporters receive their slice. * Small clean-up. * invulnerables_are_not_slashed * Minor clean ups. * Improve docs. * dont_slash_if_fraction_is_zero * Remove session dependency from offences. * Introduce sr-staking-primitives * Move offence under sr_staking_primitives * rename session_index * Resolves todos re using SessionIndex * Fix staking tests. * Properly scale denominator. * Fix UnresponsivnessOffence * Fix compilation. * Tests for offences. * Clean offences tests. * Fix staking doc test. * Bump spec version * Fix aura tests. * Fix node_executor * Deposit an event on offence. * Fix compilation of node-runtime * Remove aura slashing logic. * Remove HandleReport * Update docs for timeslot. * rename with_on_offence_fractions * Add should_properly_count_offences * Replace ValidatorIdByIndex with CurrentElectedSet ValidatorIdByIndex was querying the current_elected set in each call, doing loading (even though its from cache), deserializing and cloning of element. Instead of this it is more efficient to use `CurrentElectedSet`. As a small bonus, the invariant became a little bit easier: now we just rely on the fact that `keys` and `current_elected` set are of the same length rather than relying on the fact that `validator_id_by_index` would work similar to `<[T]>::get`. * Clarify babe equivocation * Fix offences. * Rename validators_count to validator_set_count * Fix squaring. * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: Gavin Wood <gavin@parity.io> * Docs for CurrentElectedSet. * Don't punish only invulnerables * Use `get/insert` instead of `mutate`. * Fix compilation * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: Gavin Wood <gavin@parity.io> * Update srml/offences/src/lib.rs Co-Authored-By: Robert Habermeier <rphmeier@gmail.com> * Update srml/im-online/src/lib.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update srml/im-online/src/lib.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update srml/im-online/src/lib.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update srml/babe/src/lib.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update core/sr-staking-primitives/src/offence.rs Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Add aura todo. * Allow multiple reports for single offence report. * Fix slash_fraction calculation. * Fix typos. * Fix compilation and tests. * Fix staking tests. * Update srml/im-online/src/lib.rs Co-Authored-By: Logan Saether <x@logansaether.com> * Fix doc on time_slot * Allow slashing only on current era (#3411) * only slash in current era * prune journal for last era * comment own_slash * emit an event when old slashing events are discarded * Pave the way for pruning * Address issues. * Try to refactor collect_offence_reports * Other fixes. * More fixes.
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Offences from a prior era are discarded, and we track how much of the current era's exposure we've already slashed to avoid over-slashing.