36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
// Copyright 2017-2020 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import { Call } from '@polkadot/types/interfaces';
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import BN from 'bn.js';
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import { useEffect, useState } from 'react';
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import { BN_ZERO } from '@polkadot/util';
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import useApi from './useApi';
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import useIsMountedRef from './useIsMountedRef';
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// a random address that we are using for our queries
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const ZERO_ACCOUNT = '5CAUdnwecHGxxyr5vABevAfZ34Fi4AaraDRMwfDQXQ52PXqg';
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const EMPTY_STATE: [BN, number] = [BN_ZERO, 0];
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// for a given call, calculate the weight
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export default function useWeight (call?: Call | null): [BN, number] {
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const { api } = useApi();
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const mountedRef = useIsMountedRef();
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const [state, setState] = useState(EMPTY_STATE);
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useEffect((): void => {
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if (call) {
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api.tx(call)
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.paymentInfo(ZERO_ACCOUNT)
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.then(({ weight }) => mountedRef.current && setState([weight, call.encodedLength]))
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.catch(console.error);
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} else {
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setState(EMPTY_STATE);
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}
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}, [api, call, mountedRef]);
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return state;
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}
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