packages/api-derive/src/accounts/indexes.ts
// Copyright 2017-2024 @polkadot/api-derive authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Observable } from 'rxjs';
import type { AccountIndexes, DeriveApi } from '../types.js';
import { map, of, startWith } from 'rxjs';
import { memo } from '../util/index.js';
let indicesCache: AccountIndexes | null = null;
function queryAccounts (api: DeriveApi): Observable<AccountIndexes> {
return api.query.indices.accounts.entries().pipe(
map((entries): AccountIndexes =>
entries.reduce((indexes: AccountIndexes, [key, idOpt]): AccountIndexes => {
if (idOpt.isSome) {
indexes[idOpt.unwrap()[0].toString()] = api.registry.createType('AccountIndex', key.args[0]);
}
return indexes;
}, {})
)
);
}
/**
* @name indexes
* @returns Returns all the indexes on the system.
* @description This is an unwieldly query since it loops through
* all of the enumsets and returns all of the values found. This could be up to 32k depending
* on the number of active accounts in the system
* @example
* <BR>
*
* ```javascript
* api.derive.accounts.indexes((indexes) => {
* console.log('All existing AccountIndexes', indexes);
* });
* ```
*/
export function indexes (instanceId: string, api: DeriveApi): () => Observable<AccountIndexes> {
return memo(instanceId, (): Observable<AccountIndexes> =>
indicesCache
? of(indicesCache)
: (
api.query.indices
? queryAccounts(api).pipe(startWith({}))
: of({} as AccountIndexes)
).pipe(
map((indices): AccountIndexes => {
indicesCache = indices;
return indices;
})
)
);
}