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