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Older
ensure!(era <= current_era, Error::<T>::InvalidEraToReward);
let history_depth = Self::history_depth();
ensure!(era >= current_era.saturating_sub(history_depth), Error::<T>::InvalidEraToReward);
// Note: if era has no reward to be claimed, era may be future. better not to update
// `nominator_ledger.last_reward` in this case.
let era_payout = <ErasValidatorReward<T>>::get(&era)
.ok_or_else(|| Error::<T>::InvalidEraToReward)?;
let mut nominator_ledger = <Ledger<T>>::get(&who).ok_or_else(|| Error::<T>::NotController)?;
nominator_ledger.claimed_rewards.retain(|&x| x >= current_era.saturating_sub(history_depth));
match nominator_ledger.claimed_rewards.binary_search(&era) {
Ok(_) => Err(Error::<T>::AlreadyClaimed)?,
Err(pos) => nominator_ledger.claimed_rewards.insert(pos, era),
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}
<Ledger<T>>::insert(&who, &nominator_ledger);
let mut reward = Perbill::zero();
let era_reward_points = <ErasRewardPoints<T>>::get(&era);
for (validator, nominator_index) in validators.into_iter() {
let commission = Self::eras_validator_prefs(&era, &validator).commission;
let validator_exposure = <ErasStakersClipped<T>>::get(&era, &validator);
if let Some(nominator_exposure) = validator_exposure.others
.get(nominator_index as usize)
{
if nominator_exposure.who != nominator_ledger.stash {
continue;
}
let nominator_exposure_part = Perbill::from_rational_approximation(
nominator_exposure.value,
validator_exposure.total,
);
let validator_point = era_reward_points.individual.get(&validator)
.map(|points| *points)
.unwrap_or_else(|| Zero::zero());
let validator_point_part = Perbill::from_rational_approximation(
validator_point,
era_reward_points.total,
);
reward = reward.saturating_add(
validator_point_part
.saturating_mul(Perbill::one().saturating_sub(commission))
.saturating_mul(nominator_exposure_part)
);
}
}
if let Some(imbalance) = Self::make_payout(&nominator_ledger.stash, reward * era_payout) {
Self::deposit_event(RawEvent::Reward(who, imbalance.peek()));
}
Ok(())
}
fn do_payout_validator(who: T::AccountId, era: EraIndex) -> DispatchResult {
// If migrate_era is not populated, then you should use `payout_stakers`
let migrate_era = MigrateEra::get().ok_or(Error::<T>::InvalidEraToReward)?;
// This payout mechanism will only work for eras before the migration.
// Subsequent payouts should use `payout_stakers`.
ensure!(era < migrate_era, Error::<T>::InvalidEraToReward);
let current_era = CurrentEra::get().ok_or(Error::<T>::InvalidEraToReward)?;
ensure!(era <= current_era, Error::<T>::InvalidEraToReward);
let history_depth = Self::history_depth();
ensure!(era >= current_era.saturating_sub(history_depth), Error::<T>::InvalidEraToReward);
// Note: if era has no reward to be claimed, era may be future. better not to update
// `ledger.last_reward` in this case.
let era_payout = <ErasValidatorReward<T>>::get(&era)
.ok_or_else(|| Error::<T>::InvalidEraToReward)?;
let mut ledger = <Ledger<T>>::get(&who).ok_or_else(|| Error::<T>::NotController)?;
ledger.claimed_rewards.retain(|&x| x >= current_era.saturating_sub(history_depth));
match ledger.claimed_rewards.binary_search(&era) {
Ok(_) => Err(Error::<T>::AlreadyClaimed)?,
Err(pos) => ledger.claimed_rewards.insert(pos, era),
}
<Ledger<T>>::insert(&who, &ledger);
let era_reward_points = <ErasRewardPoints<T>>::get(&era);
let commission = Self::eras_validator_prefs(&era, &ledger.stash).commission;
let exposure = <ErasStakersClipped<T>>::get(&era, &ledger.stash);
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let exposure_part = Perbill::from_rational_approximation(
exposure.own,
exposure.total,
);
let validator_point = era_reward_points.individual.get(&ledger.stash)
.map(|points| *points)
.unwrap_or_else(|| Zero::zero());
let validator_point_part = Perbill::from_rational_approximation(
validator_point,
era_reward_points.total,
);
let reward = validator_point_part.saturating_mul(
commission.saturating_add(
Perbill::one().saturating_sub(commission).saturating_mul(exposure_part)
)
);
if let Some(imbalance) = Self::make_payout(&ledger.stash, reward * era_payout) {
Self::deposit_event(RawEvent::Reward(who, imbalance.peek()));
}
Ok(())
}
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fn do_payout_stakers(
validator_stash: T::AccountId,
era: EraIndex,
) -> DispatchResult {
/* Validate input data */
let current_era = CurrentEra::get().ok_or(Error::<T>::InvalidEraToReward)?;
ensure!(era <= current_era, Error::<T>::InvalidEraToReward);
let history_depth = Self::history_depth();
ensure!(era >= current_era.saturating_sub(history_depth), Error::<T>::InvalidEraToReward);
// If there was no migration, then this function is always valid.
if let Some(migrate_era) = MigrateEra::get() {
// This payout mechanism will only work for eras on and after the migration.
// Payouts before then should use `payout_nominator`/`payout_validator`.
ensure!(migrate_era <= era, Error::<T>::InvalidEraToReward);
}
// Note: if era has no reward to be claimed, era may be future. better not to update
// `ledger.claimed_rewards` in this case.
let era_payout = <ErasValidatorReward<T>>::get(&era)
.ok_or_else(|| Error::<T>::InvalidEraToReward)?;
let controller = Self::bonded(&validator_stash).ok_or(Error::<T>::NotStash)?;
let mut ledger = <Ledger<T>>::get(&controller).ok_or_else(|| Error::<T>::NotController)?;
ledger.claimed_rewards.retain(|&x| x >= current_era.saturating_sub(history_depth));
match ledger.claimed_rewards.binary_search(&era) {
Ok(_) => Err(Error::<T>::AlreadyClaimed)?,
Err(pos) => ledger.claimed_rewards.insert(pos, era),
}
let exposure = <ErasStakersClipped<T>>::get(&era, &ledger.stash);
/* Input data seems good, no errors allowed after this point */
<Ledger<T>>::insert(&controller, &ledger);
// Get Era reward points. It has TOTAL and INDIVIDUAL
// Find the fraction of the era reward that belongs to the validator
// Take that fraction of the eras rewards to split to nominator and validator
//
// Then look at the validator, figure out the proportion of their reward
// which goes to them and each of their nominators.
let era_reward_points = <ErasRewardPoints<T>>::get(&era);
let total_reward_points = era_reward_points.total;
let validator_reward_points = era_reward_points.individual.get(&ledger.stash)
.map(|points| *points)
.unwrap_or_else(|| Zero::zero());
// Nothing to do if they have no reward points.
if validator_reward_points.is_zero() { return Ok(())}
// This is the fraction of the total reward that the validator and the
// nominators will get.
let validator_total_reward_part = Perbill::from_rational_approximation(
validator_reward_points,
total_reward_points,
);
// This is how much validator + nominators are entitled to.
let validator_total_payout = validator_total_reward_part * era_payout;
let validator_prefs = Self::eras_validator_prefs(&era, &validator_stash);
// Validator first gets a cut off the top.
let validator_commission = validator_prefs.commission;
let validator_commission_payout = validator_commission * validator_total_payout;
let validator_leftover_payout = validator_total_payout - validator_commission_payout;
// Now let's calculate how this is split to the validator.
let validator_exposure_part = Perbill::from_rational_approximation(
exposure.own,
exposure.total,
);
let validator_staking_payout = validator_exposure_part * validator_leftover_payout;
// We can now make total validator payout:
if let Some(imbalance) = Self::make_payout(
&ledger.stash,
validator_staking_payout + validator_commission_payout
) {
Self::deposit_event(RawEvent::Reward(ledger.stash, imbalance.peek()));
}
// Lets now calculate how this is split to the nominators.
// Sort nominators by highest to lowest exposure, but only keep `max_nominator_payouts` of them.
for nominator in exposure.others.iter() {
let nominator_exposure_part = Perbill::from_rational_approximation(
nominator.value,
exposure.total,
);
let nominator_reward: BalanceOf<T> = nominator_exposure_part * validator_leftover_payout;
// We can now make nominator payout:
if let Some(imbalance) = Self::make_payout(&nominator.who, nominator_reward) {
Self::deposit_event(RawEvent::Reward(nominator.who.clone(), imbalance.peek()));
}
}
Ok(())
}
/// Update the ledger for a controller. This will also update the stash lock. The lock will
/// will lock the entire funds except paying for further transactions.
fn update_ledger(
controller: &T::AccountId,
ledger: &StakingLedger<T::AccountId, BalanceOf<T>>
) {
T::Currency::set_lock(
STAKING_ID,
&ledger.stash,
ledger.total,
<Ledger<T>>::insert(controller, ledger);
}
/// Chill a stash account.
fn chill_stash(stash: &T::AccountId) {
<Validators<T>>::remove(stash);
<Nominators<T>>::remove(stash);
}
/// Actually make a payment to a staker. This uses the currency's reward function
/// to pay the right payee for the given staker account.
fn make_payout(stash: &T::AccountId, amount: BalanceOf<T>) -> Option<PositiveImbalanceOf<T>> {
let dest = Self::payee(stash);
match dest {
RewardDestination::Controller => Self::bonded(stash)
.and_then(|controller|
T::Currency::deposit_into_existing(&controller, amount).ok()
),
RewardDestination::Stash =>
T::Currency::deposit_into_existing(stash, amount).ok(),
RewardDestination::Staked => Self::bonded(stash)
.and_then(|c| Self::ledger(&c).map(|l| (c, l)))
.and_then(|(controller, mut l)| {
l.active += amount;
l.total += amount;
let r = T::Currency::deposit_into_existing(stash, amount).ok();
Self::update_ledger(&controller, &l);
/// Plan a new session potentially trigger a new era.
fn new_session(session_index: SessionIndex) -> Option<Vec<T::AccountId>> {
if let Some(current_era) = Self::current_era() {
// Initial era has been set.
let current_era_start_session_index = Self::eras_start_session_index(current_era)
.unwrap_or_else(|| {
frame_support::print("Error: start_session_index must be set for current_era");
0
});
let era_length = session_index.checked_sub(current_era_start_session_index)
.unwrap_or(0); // Must never happen.
match ForceEra::get() {
Forcing::ForceNew => ForceEra::kill(),
Forcing::ForceAlways => (),
Forcing::NotForcing if era_length >= T::SessionsPerEra::get() => (),
_ => {
// not forcing, not a new era either. If final, set the flag.
if era_length + 1 >= T::SessionsPerEra::get() {
IsCurrentSessionFinal::put(true);
}
return None
},
// new era.
IsCurrentSessionFinal::put(false);
Self::new_era(session_index)
} else {
// Set initial era
Self::new_era(session_index)
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/// Basic and cheap checks that we perform in validate unsigned, and in the execution.
pub fn pre_dispatch_checks(score: PhragmenScore, era: EraIndex) -> Result<(), Error<T>> {
// discard solutions that are not in-time
// check window open
ensure!(
Self::era_election_status().is_open(),
Error::<T>::PhragmenEarlySubmission,
);
// check current era.
if let Some(current_era) = Self::active_era().map(|e| e.index) {
ensure!(
current_era == era,
Error::<T>::PhragmenEarlySubmission,
)
}
// assume the given score is valid. Is it better than what we have on-chain, if we have any?
if let Some(queued_score) = Self::queued_score() {
ensure!(
is_score_better(queued_score, score),
Error::<T>::PhragmenWeakSubmission,
)
}
Ok(())
}
/// Checks a given solution and if correct and improved, writes it on chain as the queued result
/// of the next round. This may be called by both a signed and an unsigned transaction.
pub fn check_and_replace_solution(
winners: Vec<ValidatorIndex>,
compact_assignments: CompactAssignments,
compute: ElectionCompute,
claimed_score: PhragmenScore,
era: EraIndex,
) -> Result<(), Error<T>> {
// Do the basic checks. era, claimed score and window open.
Self::pre_dispatch_checks(claimed_score, era)?;
// Check that the number of presented winners is sane. Most often we have more candidates
// that we need. Then it should be Self::validator_count(). Else it should be all the
// candidates.
let snapshot_length = <SnapshotValidators<T>>::decode_len()
.map_err(|_| Error::<T>::SnapshotUnavailable)?;
let desired_winners = Self::validator_count().min(snapshot_length as u32);
ensure!(winners.len() as u32 == desired_winners, Error::<T>::PhragmenBogusWinnerCount);
// decode snapshot validators.
let snapshot_validators = Self::snapshot_validators()
.ok_or(Error::<T>::SnapshotUnavailable)?;
// check if all winners were legit; this is rather cheap. Replace with accountId.
let winners = winners.into_iter().map(|widx| {
// NOTE: at the moment, since staking is explicitly blocking any offence until election
// is closed, we don't check here if the account id at `snapshot_validators[widx]` is
// actually a validator. If this ever changes, this loop needs to also check this.
snapshot_validators.get(widx as usize).cloned().ok_or(Error::<T>::PhragmenBogusWinner)
}).collect::<Result<Vec<T::AccountId>, Error<T>>>()?;
// decode the rest of the snapshot.
let snapshot_nominators = <Module<T>>::snapshot_nominators()
.ok_or(Error::<T>::SnapshotUnavailable)?;
// helpers
let nominator_at = |i: NominatorIndex| -> Option<T::AccountId> {
snapshot_nominators.get(i as usize).cloned()
};
let validator_at = |i: ValidatorIndex| -> Option<T::AccountId> {
snapshot_validators.get(i as usize).cloned()
};
// un-compact.
let assignments = compact_assignments.into_assignment(
nominator_at,
validator_at,
).map_err(|e| {
// log the error since it is not propagated into the runtime error.
debug::native::warn!(
target: "staking",
"un-compacting solution failed due to {:?}",
e,
);
Error::<T>::PhragmenBogusCompact
})?;
// check all nominators actually including the claimed vote. Also check correct self votes.
// Note that we assume all validators and nominators in `assignments` are properly bonded,
// because they are coming from the snapshot via a given index.
for Assignment { who, distribution } in assignments.iter() {
let is_validator = <Validators<T>>::contains_key(&who);
let maybe_nomination = Self::nominators(&who);
if !(maybe_nomination.is_some() ^ is_validator) {
// all of the indices must map to either a validator or a nominator. If this is ever
// not the case, then the locking system of staking is most likely faulty, or we
// have bigger problems.
debug::native::error!(
target: "staking",
"detected an error in the staking locking and snapshot."
);
// abort.
return Err(Error::<T>::PhragmenBogusNominator);
}
if !is_validator {
// a normal vote
let nomination = maybe_nomination.expect(
"exactly one of `maybe_validator` and `maybe_nomination.is_some` is true. \
is_validator is false; maybe_nomination is some; qed"
);
// NOTE: we don't really have to check here if the sum of all edges are the
// nominator correct. Un-compacting assures this by definition.
for (t, _) in distribution {
// each target in the provided distribution must be actually nominated by the
// nominator after the last non-zero slash.
if nomination.targets.iter().find(|&tt| tt == t).is_none() {
return Err(Error::<T>::PhragmenBogusNomination);
}
if <Self as Store>::SlashingSpans::get(&t).map_or(
false,
|spans| nomination.submitted_in < spans.last_nonzero_slash(),
) {
return Err(Error::<T>::PhragmenSlashedNomination);
}
}
} else {
// a self vote
ensure!(distribution.len() == 1, Error::<T>::PhragmenBogusSelfVote);
ensure!(distribution[0].0 == *who, Error::<T>::PhragmenBogusSelfVote);
// defensive only. A compact assignment of length one does NOT encode the weight and
// it is always created to be 100%.
ensure!(
distribution[0].1 == OffchainAccuracy::one(),
Error::<T>::PhragmenBogusSelfVote,
);
}
}
// convert into staked assignments.
let staked_assignments = sp_phragmen::assignment_ratio_to_staked(
assignments,
Self::slashable_balance_of_extended,
);
// build the support map thereof in order to evaluate.
// OPTIMIZATION: loop to create the staked assignments but it would bloat the code. Okay for
// now as it does not add to the complexity order.
let (supports, num_error) = build_support_map::<T::AccountId>(
&winners,
&staked_assignments,
);
// This technically checks that all targets in all nominators were among the winners.
ensure!(num_error == 0, Error::<T>::PhragmenBogusEdge);
// Check if the score is the same as the claimed one.
let submitted_score = evaluate_support(&supports);
ensure!(submitted_score == claimed_score, Error::<T>::PhragmenBogusScore);
// At last, alles Ok. Exposures and store the result.
let exposures = Self::collect_exposure(supports);
debug::native::info!(
target: "staking",
"A better solution (with compute {:?}) has been validated and stored on chain.",
compute,
);
// write new results.
<QueuedElected<T>>::put(ElectionResult {
elected_stashes: winners,
compute,
exposures,
});
QueuedScore::put(submitted_score);
Ok(())
}
/// Start a session potentially starting an era.
fn start_session(start_session: SessionIndex) {
let next_active_era = Self::active_era().map(|e| e.index + 1).unwrap_or(0);
if let Some(next_active_era_start_session_index) =
Self::eras_start_session_index(next_active_era)
{
if next_active_era_start_session_index == start_session {
Self::start_era(start_session);
} else if next_active_era_start_session_index < start_session {
// This arm should never happen, but better handle it than to stall the
// staking pallet.
frame_support::print("Warning: A session appears to have been skipped.");
Self::start_era(start_session);
}
}
/// End a session potentially ending an era.
fn end_session(session_index: SessionIndex) {
if let Some(active_era) = Self::active_era() {
if let Some(next_active_era_start_session_index) =
{
if next_active_era_start_session_index == session_index + 1 {
Self::end_era(active_era, session_index);
}
/// * Increment `active_era.index`,
/// * reset `active_era.start`,
/// * update `BondedEras` and apply slashes.
fn start_era(start_session: SessionIndex) {
let active_era = ActiveEra::mutate(|active_era| {
let new_index = active_era.as_ref().map(|info| info.index + 1).unwrap_or(0);
*active_era = Some(ActiveEraInfo {
index: new_index,
// Set new active era start in next `on_finalize`. To guarantee usage of `Time`
start: None,
});
new_index
let bonding_duration = T::BondingDuration::get();
BondedEras::mutate(|bonded| {
if active_era > bonding_duration {
let first_kept = active_era - bonding_duration;
// prune out everything that's from before the first-kept index.
let n_to_prune = bonded.iter()
.take_while(|&&(era_idx, _)| era_idx < first_kept)
.count();
// kill slashing metadata.
for (pruned_era, _) in bonded.drain(..n_to_prune) {
slashing::clear_era_metadata::<T>(pruned_era);
}
if let Some(&(_, first_session)) = bonded.first() {
T::SessionInterface::prune_historical_up_to(first_session);
}
Self::apply_unapplied_slashes(active_era);
}
/// Compute payout for era.
fn end_era(active_era: ActiveEraInfo, _session_index: SessionIndex) {
// Note: active_era_start can be None if end era is called during genesis config.
if let Some(active_era_start) = active_era.start {
let now_as_millis_u64 = T::UnixTime::now().as_millis().saturated_into::<u64>();
let era_duration = now_as_millis_u64 - active_era_start;
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let (total_payout, _max_payout) = inflation::compute_total_payout(
&T::RewardCurve::get(),
Self::eras_total_stake(&active_era.index),
T::Currency::total_issuance(),
// Duration of era; more than u64::MAX is rewarded as u64::MAX.
era_duration.saturated_into::<u64>(),
);
// Set ending era reward.
<ErasValidatorReward<T>>::insert(&active_era.index, total_payout);
}
}
/// Plan a new era. Return the potential new staking set.
fn new_era(start_session_index: SessionIndex) -> Option<Vec<T::AccountId>> {
// Increment or set current era.
let current_era = CurrentEra::mutate(|s| {
*s = Some(s.map(|s| s + 1).unwrap_or(0));
s.unwrap()
});
ErasStartSessionIndex::insert(¤t_era, &start_session_index);
// Clean old era information.
if let Some(old_era) = current_era.checked_sub(Self::history_depth() + 1) {
Self::clear_era_information(old_era);
}
// Set staking information for new era.
let maybe_new_validators = Self::select_and_update_validators(current_era);
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/// Select the new validator set at the end of the era.
///
/// Runs [`try_do_phragmen`] and updates the following storage items:
/// - [`EraElectionStatus`]: with `None`.
/// - [`ErasStakers`]: with the new staker set.
/// - [`ErasStakersClipped`].
/// - [`ErasValidatorPrefs`].
/// - [`ErasTotalStake`]: with the new total stake.
/// - [`SnapshotValidators`] and [`SnapshotNominators`] are both removed.
///
/// Internally, [`QueuedElected`], snapshots and [`QueuedScore`] are also consumed.
///
/// If the election has been successful, It passes the new set upwards.
///
/// This should only be called at the end of an era.
fn select_and_update_validators(current_era: EraIndex) -> Option<Vec<T::AccountId>> {
if let Some(ElectionResult::<T::AccountId, BalanceOf<T>> {
elected_stashes,
exposures,
compute,
}) = Self::try_do_phragmen() {
// We have chosen the new validator set. Submission is no longer allowed.
<EraElectionStatus<T>>::put(ElectionStatus::Closed);
// kill the snapshots.
Self::kill_stakers_snapshot();
// Populate Stakers and write slot stake.
let mut total_stake: BalanceOf<T> = Zero::zero();
exposures.into_iter().for_each(|(stash, exposure)| {
total_stake = total_stake.saturating_add(exposure.total);
<ErasStakers<T>>::insert(current_era, &stash, &exposure);
let mut exposure_clipped = exposure;
let clipped_max_len = T::MaxNominatorRewardedPerValidator::get() as usize;
if exposure_clipped.others.len() > clipped_max_len {
exposure_clipped.others.sort_unstable_by(|a, b| a.value.cmp(&b.value).reverse());
exposure_clipped.others.truncate(clipped_max_len);
<ErasStakersClipped<T>>::insert(¤t_era, &stash, exposure_clipped);
});
// Insert current era staking information
<ErasTotalStake<T>>::insert(¤t_era, total_stake);
// collect the pref of all winners
for stash in &elected_stashes {
let pref = Self::validators(stash);
<ErasValidatorPrefs<T>>::insert(¤t_era, stash, pref);
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// emit event
Self::deposit_event(RawEvent::StakingElection(compute));
debug::native::info!(
target: "staking",
"new validator set of size {:?} has been elected via {:?} for era {:?}",
elected_stashes.len(),
compute,
current_era,
);
Some(elected_stashes)
} else {
None
}
}
/// Select a new validator set from the assembled stakers and their role preferences. It tries
/// first to peek into [`QueuedElected`]. Otherwise, it runs a new phragmen.
///
/// If [`QueuedElected`] and [`QueuedScore`] exists, they are both removed. No further storage
/// is updated.
fn try_do_phragmen() -> Option<ElectionResult<T::AccountId, BalanceOf<T>>> {
// a phragmen result from either a stored submission or locally executed one.
let next_result = <QueuedElected<T>>::take().or_else(||
Self::do_phragmen_with_post_processing::<ChainAccuracy>(ElectionCompute::OnChain)
);
// either way, kill this. We remove it here to make sure it always has the exact same
// lifetime as `QueuedElected`.
QueuedScore::kill();
next_result
/// Execute phragmen and return the new results. The edge weights are processed into support
/// values.
///
/// This is basically a wrapper around [`do_phragmen`] which translates `PhragmenResult` into
/// `ElectionResult`.
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/// No storage item is updated.
fn do_phragmen_with_post_processing<Accuracy: PerThing>(compute: ElectionCompute)
-> Option<ElectionResult<T::AccountId, BalanceOf<T>>>
where
Accuracy: sp_std::ops::Mul<ExtendedBalance, Output=ExtendedBalance>,
ExtendedBalance: From<<Accuracy as PerThing>::Inner>,
{
if let Some(phragmen_result) = Self::do_phragmen::<Accuracy>() {
let elected_stashes = phragmen_result.winners.iter()
.map(|(s, _)| s.clone())
.collect::<Vec<T::AccountId>>();
let assignments = phragmen_result.assignments;
let staked_assignments = sp_phragmen::assignment_ratio_to_staked(
assignments,
Self::slashable_balance_of_extended,
);
let (supports, _) = build_support_map::<T::AccountId>(
&elected_stashes,
&staked_assignments,
);
// collect exposures
let exposures = Self::collect_exposure(supports);
// In order to keep the property required by `on_session_ending` that we must return the
// new validator set even if it's the same as the old, as long as any underlying
// economic conditions have changed, we don't attempt to do any optimization where we
// compare against the prior set.
Some(ElectionResult::<T::AccountId, BalanceOf<T>> {
elected_stashes,
exposures,
compute,
})
} else {
// There were not enough candidates for even our minimal level of functionality. This is
// bad. We should probably disable all functionality except for block production and let
// the chain keep producing blocks until we can decide on a sufficiently substantial
// set. TODO: #2494
None
}
}
/// Execute phragmen and return the new results. No post-processing is applied and the raw edge
/// weights are returned.
/// Self votes are added and nominations before the most recent slashing span are reaped.
/// No storage item is updated.
fn do_phragmen<Accuracy: PerThing>() -> Option<PhragmenResult<T::AccountId, Accuracy>> {
let mut all_nominators: Vec<(T::AccountId, BalanceOf<T>, Vec<T::AccountId>)> = Vec::new();
for (validator, _) in <Validators<T>>::iter() {
// append self vote
let self_vote = (validator.clone(), Self::slashable_balance_of(&validator), vec![validator.clone()]);
let nominator_votes = <Nominators<T>>::iter().map(|(nominator, nominations)| {
let Nominations { submitted_in, mut targets, suppressed: _ } = nominations;
// Filter out nomination targets which were nominated before the most recent
targets.retain(|stash| {
<Self as Store>::SlashingSpans::get(&stash).map_or(
true,
|spans| submitted_in >= spans.last_nonzero_slash(),
)
});
(nominator, targets)
});
all_nominators.extend(nominator_votes.map(|(n, ns)| {
let s = Self::slashable_balance_of(&n);
(n, s, ns)
}));
elect::<_, _, T::CurrencyToVote, Accuracy>(
Self::validator_count() as usize,
Self::minimum_validator_count().max(1) as usize,
all_validators,
all_nominators,
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/// Consume a set of [`Supports`] from [`sp_phragmen`] and collect them into a [`Exposure`]
fn collect_exposure(supports: SupportMap<T::AccountId>) -> Vec<(T::AccountId, Exposure<T::AccountId, BalanceOf<T>>)> {
let to_balance = |e: ExtendedBalance|
<T::CurrencyToVote as Convert<ExtendedBalance, BalanceOf<T>>>::convert(e);
supports.into_iter().map(|(validator, support)| {
// build `struct exposure` from `support`
let mut others = Vec::new();
let mut own: BalanceOf<T> = Zero::zero();
let mut total: BalanceOf<T> = Zero::zero();
support.voters
.into_iter()
.map(|(nominator, weight)| (nominator, to_balance(weight)))
.for_each(|(nominator, stake)| {
if nominator == validator {
own = own.saturating_add(stake);
} else {
others.push(IndividualExposure { who: nominator, value: stake });
}
total = total.saturating_add(stake);
});
let exposure = Exposure {
own,
others,
total,
};
(validator, exposure)
}).collect::<Vec<(T::AccountId, Exposure<_, _>)>>()
/// Remove all associated data of a stash account from the staking system.
///
/// Assumes storage is upgraded before calling.
///
/// - after a `withdraw_unbond()` call that frees all of a stash's bonded balance.
/// - through `reap_stash()` if the balance has fallen to zero (through slashing).
fn kill_stash(stash: &T::AccountId) -> DispatchResult {
let controller = Bonded::<T>::take(stash).ok_or(Error::<T>::NotStash)?;
<Ledger<T>>::remove(&controller);
<Payee<T>>::remove(stash);
<Validators<T>>::remove(stash);
<Nominators<T>>::remove(stash);
slashing::clear_stash_metadata::<T>(stash);
system::Module::<T>::dec_ref(stash);
Ok(())
}
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/// Clear all era information for given era.
fn clear_era_information(era_index: EraIndex) {
<ErasStakers<T>>::remove_prefix(era_index);
<ErasStakersClipped<T>>::remove_prefix(era_index);
<ErasValidatorPrefs<T>>::remove_prefix(era_index);
<ErasValidatorReward<T>>::remove(era_index);
<ErasRewardPoints<T>>::remove(era_index);
<ErasTotalStake<T>>::remove(era_index);
ErasStartSessionIndex::remove(era_index);
}
/// Apply previously-unapplied slashes on the beginning of a new era, after a delay.
fn apply_unapplied_slashes(active_era: EraIndex) {
let slash_defer_duration = T::SlashDeferDuration::get();
<Self as Store>::EarliestUnappliedSlash::mutate(|earliest| if let Some(ref mut earliest) = earliest {
let keep_from = active_era.saturating_sub(slash_defer_duration);
for era in (*earliest)..keep_from {
let era_slashes = <Self as Store>::UnappliedSlashes::take(&era);
for slash in era_slashes {
slashing::apply_slash::<T>(slash);
}
}
*earliest = (*earliest).max(keep_from)
})
}
/// Add reward points to validators using their stash account ID.
///
/// Validators are keyed by stash account ID and must be in the current elected set.
///
/// For each element in the iterator the given number of points in u32 is added to the
/// validator, thus duplicates are handled.
///
/// At the end of the era each the total payout will be distributed among validator
/// relatively to their points.
///
/// COMPLEXITY: Complexity is `number_of_validator_to_reward x current_elected_len`.
/// If you need to reward lots of validator consider using `reward_by_indices`.
pub fn reward_by_ids(
validators_points: impl IntoIterator<Item = (T::AccountId, u32)>
) {
if let Some(active_era) = Self::active_era() {
<ErasRewardPoints<T>>::mutate(active_era.index, |era_rewards| {
for (validator, points) in validators_points.into_iter() {
*era_rewards.individual.entry(validator).or_default() += points;
era_rewards.total += points;
});
}
}
/// Ensures that at the end of the current session there will be a new era.
fn ensure_new_era() {
match ForceEra::get() {
Forcing::ForceAlways | Forcing::ForceNew => (),
_ => ForceEra::put(Forcing::ForceNew),
}
#[cfg(feature = "runtime-benchmarks")]
pub fn add_era_stakers(current_era: EraIndex, controller: T::AccountId, exposure: Exposure<T::AccountId, BalanceOf<T>>) {
<ErasStakers<T>>::insert(¤t_era, &controller, &exposure);
}
#[cfg(feature = "runtime-benchmarks")]
pub fn put_election_status(status: ElectionStatus::<T::BlockNumber>) {
<EraElectionStatus<T>>::put(status);
}
/// In this implementation `new_session(session)` must be called before `end_session(session-1)`
/// i.e. the new session must be planned before the ending of the previous session.
///
/// Once the first new_session is planned, all session must start and then end in order, though
/// some session can lag in between the newest session planned and the latest session started.
impl<T: Trait> pallet_session::SessionManager<T::AccountId> for Module<T> {
fn new_session(new_index: SessionIndex) -> Option<Vec<T::AccountId>> {
Self::new_session(new_index)
}
fn start_session(start_index: SessionIndex) {
Self::start_session(start_index)
}
fn end_session(end_index: SessionIndex) {
Self::end_session(end_index)
impl<T: Trait> historical::SessionManager<T::AccountId, Exposure<T::AccountId, BalanceOf<T>>> for Module<T> {
fn new_session(new_index: SessionIndex)
-> Option<Vec<(T::AccountId, Exposure<T::AccountId, BalanceOf<T>>)>>
<Self as pallet_session::SessionManager<_>>::new_session(new_index).map(|validators| {
let current_era = Self::current_era()
// Must be some as a new era has been created.
.unwrap_or(0);
(v, exposure)
}).collect()
})
}
fn start_session(start_index: SessionIndex) {
<Self as pallet_session::SessionManager<_>>::start_session(start_index)
}
fn end_session(end_index: SessionIndex) {
<Self as pallet_session::SessionManager<_>>::end_session(end_index)
/// Add reward points to block authors:
/// * 20 points to the block producer for producing a (non-uncle) block in the relay chain,
/// * 2 points to the block producer for each reference to a previously unreferenced uncle, and
/// * 1 point to the producer of each referenced uncle block.
impl<T> pallet_authorship::EventHandler<T::AccountId, T::BlockNumber> for Module<T>
where
T: Trait + pallet_authorship::Trait + pallet_session::Trait
{
fn note_author(author: T::AccountId) {
}
fn note_uncle(author: T::AccountId, _age: T::BlockNumber) {
(<pallet_authorship::Module<T>>::author(), 2),
/// A `Convert` implementation that finds the stash of the given controller account,
/// if any.
pub struct StashOf<T>(sp_std::marker::PhantomData<T>);
impl<T: Trait> Convert<T::AccountId, Option<T::AccountId>> for StashOf<T> {
fn convert(controller: T::AccountId) -> Option<T::AccountId> {
<Module<T>>::ledger(&controller).map(|l| l.stash)
}
}
/// A typed conversion from stash account ID to the active exposure of nominators
/// on that account.
///
/// Active exposure is the exposure of the validator set currently validating, i.e. in
/// `active_era`. It can differ from the latest planned exposure in `current_era`.
pub struct ExposureOf<T>(sp_std::marker::PhantomData<T>);
impl<T: Trait> Convert<T::AccountId, Option<Exposure<T::AccountId, BalanceOf<T>>>>
for ExposureOf<T>
{
fn convert(validator: T::AccountId) -> Option<Exposure<T::AccountId, BalanceOf<T>>> {
if let Some(active_era) = <Module<T>>::active_era() {
Some(<Module<T>>::eras_stakers(active_era.index, &validator))
} else {
None
}
/// This is intended to be used with `FilterHistoricalOffences`.
impl <T: Trait> OnOffenceHandler<T::AccountId, pallet_session::historical::IdentificationTuple<T>> for Module<T> where
T: pallet_session::Trait<ValidatorId = <T as frame_system::Trait>::AccountId>,
T: pallet_session::historical::Trait<
FullIdentification = Exposure<<T as frame_system::Trait>::AccountId, BalanceOf<T>>,
FullIdentificationOf = ExposureOf<T>,
>,
T::SessionHandler: pallet_session::SessionHandler<<T as frame_system::Trait>::AccountId>,
T::SessionManager: pallet_session::SessionManager<<T as frame_system::Trait>::AccountId>,
T::ValidatorIdOf: Convert<<T as frame_system::Trait>::AccountId, Option<<T as frame_system::Trait>::AccountId>>
offenders: &[OffenceDetails<T::AccountId, pallet_session::historical::IdentificationTuple<T>>],
slash_session: SessionIndex,
) -> Result<(), ()> {
if !Self::can_report() {
return Err(())
}