41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
// Copyright 2017-2021 @polkadot/app-democracy authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { ApiPromise } from '@polkadot/api';
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import type { WeightToFeeCoefficient } from '@polkadot/types/interfaces';
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import BN from 'bn.js';
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import { useMemo } from 'react';
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import { BN_BILLION, BN_ZERO, bnToBn, isUndefined } from '@polkadot/util';
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import { createNamedHook } from './createNamedHook';
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import { useApi } from './useApi';
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function useWeightFeeImpl (weight: BN | number, apiOverride?: ApiPromise | null): BN {
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const { api } = useApi();
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return useMemo(
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() => isUndefined(apiOverride) || apiOverride
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? ((apiOverride || api).consts.transactionPayment?.weightToFee || []).reduce((acc, { coeffFrac, coeffInteger, degree, negative }: WeightToFeeCoefficient): BN => {
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const w = bnToBn(weight).pow(degree);
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const frac = coeffFrac.mul(w).div(BN_BILLION);
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const integer = coeffInteger.mul(w);
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if (negative.isTrue) {
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acc.isub(frac);
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acc.isub(integer);
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} else {
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acc.iadd(frac);
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acc.iadd(integer);
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}
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return acc;
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}, new BN(0))
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: BN_ZERO,
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[api, apiOverride, weight]
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);
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}
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export const useWeightFee = createNamedHook('useWeightFee', useWeightFeeImpl);
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