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Staking: store last min-active-bond on-chain (#12889)

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* Staking: store last min-active-bond on-chain

Storing the `min-active-bond` onchain helps the UIs with minimal on-chain costs.

Closes https://github.com/paritytech/substrate/issues/12746

* Avoid relying on  sorting to set the

* Addresses PR comments
This commit is contained in:
Gonçalo Pestana
2022-12-14 22:55:24 +00:00
committed by GitHub
parent 391adaf443
commit 14bd4bde25
3 changed files with 43 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/staking/src/pallet/impls.rs
+13 -1
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@@ -704,6 +704,9 @@ impl<T: Config> Pallet<T> {
///
/// `maybe_max_len` can imposes a cap on the number of voters returned;
///
/// Sets `MinimumActiveStake` to the minimum active nominator stake in the returned set of
/// nominators.
///
/// This function is self-weighing as [`DispatchClass::Mandatory`].
pub fn get_npos_voters(maybe_max_len: Option<usize>) -> Vec<VoterOf<Self>> {
let max_allowed_len = {
@@ -719,6 +722,7 @@ impl<T: Config> Pallet<T> {
let mut voters_seen = 0u32;
let mut validators_taken = 0u32;
let mut nominators_taken = 0u32;
let mut min_active_stake = u64::MAX;
let mut sorted_voters = T::VoterList::iter();
while all_voters.len() < max_allowed_len &&
@@ -733,12 +737,15 @@ impl<T: Config> Pallet<T> {
};
if let Some(Nominations { targets, .. }) = <Nominators<T>>::get(&voter) {
let voter_weight = weight_of(&voter);
if !targets.is_empty() {
all_voters.push((voter.clone(), weight_of(&voter), targets));
all_voters.push((voter.clone(), voter_weight, targets));
nominators_taken.saturating_inc();
} else {
// Technically should never happen, but not much we can do about it.
}
min_active_stake =
if voter_weight < min_active_stake { voter_weight } else { min_active_stake };
} else if Validators::<T>::contains_key(&voter) {
// if this voter is a validator:
let self_vote = (
@@ -769,6 +776,11 @@ impl<T: Config> Pallet<T> {
Self::register_weight(T::WeightInfo::get_npos_voters(validators_taken, nominators_taken));
let min_active_stake: T::CurrencyBalance =
if all_voters.len() == 0 { 0u64.into() } else { min_active_stake.into() };
MinimumActiveStake::<T>::put(min_active_stake);
log!(
info,
"generated {} npos voters, {} from validators and {} nominators",