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Cater for new generation inflation calcs #8400

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Cater for new generation inflation calcs #8400

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24 changes: 14 additions & 10 deletions packages/react-hooks/src/useInflation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,28 +2,28 @@
// SPDX-License-Identifier: Apache-2.0

import type { ApiPromise } from '@polkadot/api';
import type { BN } from '@polkadot/util';
import type { ParaId } from '@polkadot/types/interfaces';
import type { Inflation } from './types';

import { useEffect, useState } from 'react';

import { getInflationParams } from '@polkadot/apps-config';
import { BN_MILLION, BN_ZERO } from '@polkadot/util';
import { BN, BN_MILLION, BN_ZERO } from '@polkadot/util';

import { createNamedHook } from './createNamedHook';
import { useApi } from './useApi';
import { useCall } from './useCall';

const EMPTY: Inflation = { idealInterest: 0, idealStake: 0, inflation: 0, stakedFraction: 0, stakedReturn: 0 };

function calcInflation (api: ApiPromise, totalStaked: BN, totalIssuance: BN, numAuctions: BN): Inflation {
function calcInflation (api: ApiPromise, totalStaked: BN, totalIssuance: BN, numParas: BN): Inflation {
const { auctionAdjust, auctionMax, falloff, maxInflation, minInflation, stakeTarget } = getInflationParams(api);
const stakedFraction = totalStaked.isZero() || totalIssuance.isZero()
? 0
: totalStaked.mul(BN_MILLION).div(totalIssuance).toNumber() / BN_MILLION.toNumber();
// Ideal is less based on the actual auctions, see
// https://github.com/paritytech/polkadot/blob/816cb64ea16102c6c79f6be2a917d832d98df757/runtime/kusama/src/lib.rs#L531
const idealStake = stakeTarget - (Math.min(auctionMax, numAuctions.toNumber()) * auctionAdjust);
const idealStake = stakeTarget - (Math.min(auctionMax, numParas.toNumber()) * auctionAdjust);
const idealInterest = maxInflation / idealStake;
// inflation calculations, see
// https://github.com/paritytech/substrate/blob/0ba251c9388452c879bfcca425ada66f1f9bc802/frame/staking/reward-fn/src/lib.rs#L28-L54
Expand All @@ -47,18 +47,22 @@ function calcInflation (api: ApiPromise, totalStaked: BN, totalIssuance: BN, num
function useInflationImpl (totalStaked?: BN): Inflation {
const { api } = useApi();
const totalIssuance = useCall<BN>(api.query.balances?.totalIssuance);
const auctionCounter = useCall<BN>(api.query.auctions?.auctionCounter);
const paraIds = useCall<ParaId[]>(api.query.paras?.parachains);
const [state, setState] = useState<Inflation>(EMPTY);

useEffect((): void => {
const numAuctions = api.query.auctions
? auctionCounter
// Current generation uses the number of public paras (previously auction counter),
// i.e. all those that are non-common and non-system chains as indicate by >= 2000
// as the paraId are counted
// https://github.com/paritytech/polkadot/blob/3cf644abad63c4a177f0697683b72a64c4706852/runtime/kusama/src/lib.rs#L521-L546
const numParas = api.query.paras
? paraIds && new BN(paraIds.filter((id) => id.gten(2_000)).length)
: BN_ZERO;

numAuctions && totalIssuance && totalStaked && setState(
calcInflation(api, totalStaked, totalIssuance, numAuctions)
numParas && totalIssuance && totalStaked && setState(
calcInflation(api, totalStaked, totalIssuance, numParas)
);
}, [api, auctionCounter, totalIssuance, totalStaked]);
}, [api, paraIds, totalIssuance, totalStaked]);

return state;
}
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