35 lines
1.2 KiB
TypeScript
35 lines
1.2 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 { AccountId, AccountIndex } from '@polkadot/types/interfaces';
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import type { Observable } from '@polkadot/x-rxjs';
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import type { AccountIndexes } from '../types';
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import { map } from '@polkadot/x-rxjs/operators';
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import { memo } from '../util';
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/**
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* @name idToIndex
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* @param {( AccountId | string )} accountId - An accounts Id in different formats.
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* @returns Returns the corresponding AccountIndex.
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* @example
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* <BR>
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*
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* ```javascript
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* const ALICE = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';
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* api.derive.accounts.idToIndex(ALICE, (accountIndex) => {
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* console.log(`The AccountIndex of ${ALICE} is ${accountIndex}`);
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* });
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* ```
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*/
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export function idToIndex (instanceId: string, api: ApiInterfaceRx): (accountId: AccountId | string) => Observable<AccountIndex | undefined> {
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return memo(instanceId, (accountId: AccountId | string): Observable<AccountIndex | undefined> =>
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api.derive.accounts.indexes().pipe(
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map((indexes: AccountIndexes): AccountIndex | undefined =>
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(indexes || {})[accountId.toString()]
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)
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));
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}
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