60 lines
2.1 KiB
TypeScript
60 lines
2.1 KiB
TypeScript
// Copyright 2017-2021 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type BN from 'bn.js';
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import type { ApiPromise } from '@polkadot/api';
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import type { Inflation } from './types';
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import { useEffect, useState } from 'react';
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import { getInflationParams } from '@polkadot/apps-config';
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import { BN_MILLION, BN_ZERO } from '@polkadot/util';
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import { useApi } from './useApi';
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import { useCall } from './useCall';
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const EMPTY: Inflation = { idealInterest: 0, idealStake: 0, inflation: 0, stakedFraction: 0, stakedReturn: 0 };
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function calcInflation (api: ApiPromise, totalStaked: BN, totalIssuance: BN, numAuctions: BN): Inflation {
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const { auctionAdjust, auctionMax, falloff, maxInflation, minInflation, stakeTarget } = getInflationParams(api);
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const stakedFraction = totalStaked.isZero() || totalIssuance.isZero()
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? 0
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: totalStaked.mul(BN_MILLION).div(totalIssuance).toNumber() / BN_MILLION.toNumber();
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const idealStake = stakeTarget - (Math.min(auctionMax, numAuctions.toNumber()) * auctionAdjust);
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const idealInterest = maxInflation / idealStake;
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const inflation = 100 * (minInflation + (
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stakedFraction <= idealStake
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? (stakedFraction * (idealInterest - (minInflation / idealStake)))
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: (((idealInterest * idealStake) - minInflation) * Math.pow(2, (idealStake - stakedFraction) / falloff))
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));
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return {
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idealInterest,
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idealStake,
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inflation,
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stakedFraction,
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stakedReturn: stakedFraction
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? (inflation / stakedFraction)
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: 0
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};
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}
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export function useInflation (totalStaked?: BN): Inflation {
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const { api } = useApi();
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const totalIssuance = useCall<BN>(api.query.balances?.totalIssuance);
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const auctionCounter = useCall<BN>(api.query.auctions?.auctionCounter);
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const [state, setState] = useState<Inflation>(EMPTY);
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useEffect((): void => {
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const numAuctions = api.query.auctions
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? auctionCounter
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: BN_ZERO;
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numAuctions && totalIssuance && totalStaked && setState(
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calcInflation(api, totalStaked, totalIssuance, numAuctions)
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);
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}, [api, auctionCounter, totalIssuance, totalStaked]);
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return state;
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}
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