Jaco Greeff
e6e96aa9c9
* Make indices optional * Updtae contracts with optional creation * Flatten contract fees
55 lines
1.8 KiB
TypeScript
55 lines
1.8 KiB
TypeScript
// Copyright 2017-2020 @polkadot/api-derive 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 { ApiInterfaceRx } from '@polkadot/api/types';
|
|
import { Balance } from '@polkadot/types/interfaces';
|
|
import { DerivedFees } from '../types';
|
|
|
|
import { Observable, of } from 'rxjs';
|
|
import { map } from 'rxjs/operators';
|
|
import { createType } from '@polkadot/types';
|
|
|
|
import { memo } from '../util';
|
|
|
|
type Result = [Balance, Balance, Balance, Balance, Balance];
|
|
|
|
function query (api: ApiInterfaceRx): Observable<Result> {
|
|
return of([
|
|
// deprecated - remove
|
|
(api.consts.balances.creationFee as Balance) || createType(api.registry, 'Balance'),
|
|
(api.consts.balances.transferFee as Balance) || createType(api.registry, 'Balance'),
|
|
|
|
// current
|
|
api.consts.balances.existentialDeposit,
|
|
api.consts.transactionPayment.transactionBaseFee,
|
|
api.consts.transactionPayment.transactionByteFee
|
|
]);
|
|
}
|
|
|
|
/**
|
|
* @name fees
|
|
* @returns An object containing the combined results of the storage queries for
|
|
* all relevant fees as declared in the substrate chain spec.
|
|
* @example
|
|
* <BR>
|
|
*
|
|
* ```javascript
|
|
* api.derive.balances.fees(({ creationFee, transferFee }) => {
|
|
* 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.`);
|
|
* });
|
|
* ```
|
|
*/
|
|
export function fees (api: ApiInterfaceRx): () => Observable<DerivedFees> {
|
|
return memo((): Observable<DerivedFees> =>
|
|
query(api).pipe(
|
|
map(([creationFee, transferFee, existentialDeposit, transactionBaseFee, transactionByteFee]): DerivedFees => ({
|
|
creationFee,
|
|
existentialDeposit,
|
|
transactionBaseFee,
|
|
transactionByteFee,
|
|
transferFee
|
|
}))
|
|
));
|
|
}
|