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Update polkadot inflation to take into account auctions (#5872)

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* Update polkadot inflation to take into account auctions

* a possible solution -- but needs a rather untrivial data seeding

* some additional comments

* Use LOWEST_PUBLIC_ID as a guide to filter out system/common good para ids

* Fixes

* move tests

* fix

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Kian Paimani
2022-11-08 08:04:46 +00:00
committed by GitHub
parent 1ed5e1ad7e
commit fb40925ebe
7 changed files with 125 additions and 81 deletions
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polkadot/runtime/kusama/src/lib.rs
+10 -43
View File
@@ -26,6 +26,7 @@ use primitives::v2::{
CoreState, GroupRotationInfo, Hash, Id as ParaId, InboundDownwardMessage, InboundHrmpMessage,
Moment, Nonce, OccupiedCoreAssumption, PersistedValidationData, ScrapedOnChainVotes,
SessionInfo, Signature, ValidationCode, ValidationCodeHash, ValidatorId, ValidatorIndex,
LOWEST_PUBLIC_ID,
};
use runtime_common::{
auctions, claims, crowdloan, impl_runtime_weights, impls::DealWithFees, paras_registrar,
@@ -504,45 +505,6 @@ impl pallet_bags_list::Config<VoterBagsListInstance> for Runtime {
type Score = sp_npos_elections::VoteWeight;
}
fn era_payout(
total_staked: Balance,
non_gilt_issuance: Balance,
max_annual_inflation: Perquintill,
period_fraction: Perquintill,
auctioned_slots: u64,
) -> (Balance, Balance) {
use pallet_staking_reward_fn::compute_inflation;
use sp_arithmetic::traits::Saturating;
let min_annual_inflation = Perquintill::from_rational(25u64, 1000u64);
let delta_annual_inflation = max_annual_inflation.saturating_sub(min_annual_inflation);
// 30% reserved for up to 60 slots.
let auction_proportion = Perquintill::from_rational(auctioned_slots.min(60), 200u64);
// Therefore the ideal amount at stake (as a percentage of total issuance) is 75% less the amount that we expect
// to be taken up with auctions.
let ideal_stake = Perquintill::from_percent(75).saturating_sub(auction_proportion);
let stake = Perquintill::from_rational(total_staked, non_gilt_issuance);
let falloff = Perquintill::from_percent(5);
let adjustment = compute_inflation(stake, ideal_stake, falloff);
let staking_inflation =
min_annual_inflation.saturating_add(delta_annual_inflation * adjustment);
let max_payout = period_fraction * max_annual_inflation * non_gilt_issuance;
let staking_payout = (period_fraction * staking_inflation) * non_gilt_issuance;
let rest = max_payout.saturating_sub(staking_payout);
let other_issuance = non_gilt_issuance.saturating_sub(total_staked);
if total_staked > other_issuance {
let _cap_rest = Perquintill::from_rational(other_issuance, total_staked) * staking_payout;
// We don't do anything with this, but if we wanted to, we could introduce a cap on the treasury amount
// with: `rest = rest.min(cap_rest);`
}
(staking_payout, rest)
}
pub struct EraPayout;
impl pallet_staking::EraPayout<Balance> for EraPayout {
fn era_payout(
@@ -550,13 +512,18 @@ impl pallet_staking::EraPayout<Balance> for EraPayout {
_total_issuance: Balance,
era_duration_millis: u64,
) -> (Balance, Balance) {
// TODO: #3011 Update with proper auctioned slots tracking.
// This should be fine for the first year of parachains.
let auctioned_slots: u64 = auctions::Pallet::<Runtime>::auction_counter().into();
// all para-ids that are currently active.
let auctioned_slots = Paras::parachains()
.into_iter()
// all active para-ids that do not belong to a system or common good chain is the number
// of parachains that we should take into account for inflation.
.filter(|i| *i >= LOWEST_PUBLIC_ID)
.count() as u64;
const MAX_ANNUAL_INFLATION: Perquintill = Perquintill::from_percent(10);
const MILLISECONDS_PER_YEAR: u64 = 1000 * 3600 * 24 * 36525 / 100;
era_payout(
runtime_common::impls::era_payout(
total_staked,
Gilt::issuance().non_gilt,
MAX_ANNUAL_INFLATION,