67 lines
2.4 KiB
TypeScript
67 lines
2.4 KiB
TypeScript
// Copyright 2017-2021 @polkadot/api-derive authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { ApiInterfaceRx } from '@polkadot/api/types';
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import type { Observable } from '@polkadot/x-rxjs';
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import type { DeriveContractFees } from '../types';
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import BN from 'bn.js';
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import { of } from '@polkadot/x-rxjs';
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import { map } from '@polkadot/x-rxjs/operators';
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import { memo } from '../util';
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type ResultV2 = [BN, BN, BN, BN, BN, BN, BN, BN, BN, BN];
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// query via constants (current applicable path)
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function queryConstants (api: ApiInterfaceRx): Observable<ResultV2> {
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return of([
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// deprecated
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api.consts.contracts.callBaseFee || api.registry.createType('Balance'),
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api.consts.contracts.contractFee || api.registry.createType('Balance'),
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api.consts.contracts.creationFee || api.registry.createType('Balance'),
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api.consts.contracts.transactionBaseFee || api.registry.createType('Balance'),
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api.consts.contracts.transactionByteFee || api.registry.createType('Balance'),
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api.consts.contracts.transferFee || api.registry.createType('Balance'),
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// current
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api.consts.contracts.rentByteFee,
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api.consts.contracts.rentDepositOffset,
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api.consts.contracts.surchargeReward,
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api.consts.contracts.tombstoneDeposit
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]) as unknown as Observable<ResultV2>;
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}
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/**
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* @name fees
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* @returns An object containing the combined results of the queries for
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* all relevant contract 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.contracts.fees(([creationFee, transferFee]) => {
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* console.log(`The fee for creating a new contract on this chain is ${creationFee} units. The fee required to call this contract is ${transferFee} units.`);
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* });
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* ```
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*/
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export function fees (instanceId: string, api: ApiInterfaceRx): () => Observable<DeriveContractFees> {
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return memo(instanceId, (): Observable<DeriveContractFees> => {
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return queryConstants(api).pipe(
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map(([callBaseFee, contractFee, creationFee, transactionBaseFee, transactionByteFee, transferFee, rentByteFee, rentDepositOffset, surchargeReward, tombstoneDeposit]): DeriveContractFees => ({
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callBaseFee,
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contractFee,
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creationFee,
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rentByteFee,
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rentDepositOffset,
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surchargeReward,
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tombstoneDeposit,
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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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}
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