48 lines
1.8 KiB
TypeScript
48 lines
1.8 KiB
TypeScript
// Copyright 2017-2020 @polkadot/api-derive authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import { ApiInterfaceRx } from '@polkadot/api/types';
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import { Balance } from '@polkadot/types/interfaces';
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import { DeriveFees } from '../types';
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import { Observable, of } from 'rxjs';
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import { map } from 'rxjs/operators';
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import { memo } from '../util';
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/**
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* @name fees
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* @returns An object containing the combined results of the storage queries for
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* all relevant fees as declared in the substrate chain spec.
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* @example
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* <BR>
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*
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* ```javascript
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* api.derive.balances.fees(({ creationFee, transferFee }) => {
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* console.log(`The fee for creating a new account on this chain is ${creationFee} units. The fee required for making a transfer is ${transferFee} units.`);
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* });
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* ```
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*/
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export function fees (api: ApiInterfaceRx): () => Observable<DeriveFees> {
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return memo((): Observable<DeriveFees> =>
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of([
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// deprecated - remove
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(api.consts.balances?.creationFee as Balance) || api.registry.createType('Balance'),
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(api.consts.balances?.transferFee as Balance) || api.registry.createType('Balance'),
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// current
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(api.consts.balances?.existentialDeposit as Balance) || api.registry.createType('Balance'),
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(api.consts.transactionPayment?.transactionBaseFee as Balance) || api.registry.createType('Balance'),
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(api.consts.transactionPayment?.transactionByteFee as Balance) || api.registry.createType('Balance')
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]).pipe(
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map(([creationFee, transferFee, existentialDeposit, transactionBaseFee, transactionByteFee]): DeriveFees => ({
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creationFee,
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existentialDeposit,
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transactionBaseFee,
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transactionByteFee,
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transferFee
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}))
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));
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}
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