packages/api-derive/src/staking/electedInfo.ts
// Copyright 2017-2024 @polkadot/api-derive authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Observable } from 'rxjs';
import type { AccountId } from '@polkadot/types/interfaces';
import type { DeriveApi, DeriveStakingElected, StakingQueryFlags } from '../types.js';
import { map, switchMap } from 'rxjs';
import { arrayFlatten } from '@polkadot/util';
import { memo } from '../util/index.js';
const DEFAULT_FLAGS = { withController: true, withExposure: true, withPrefs: true };
function combineAccounts (nextElected: AccountId[], validators: AccountId[]): AccountId[] {
return arrayFlatten([nextElected, validators.filter((v) => !nextElected.find((n) => n.eq(v)))]);
}
export function electedInfo (instanceId: string, api: DeriveApi): (flags?: StakingQueryFlags) => Observable<DeriveStakingElected> {
return memo(instanceId, (flags: StakingQueryFlags = DEFAULT_FLAGS): Observable<DeriveStakingElected> =>
api.derive.staking.validators().pipe(
switchMap(({ nextElected, validators }): Observable<DeriveStakingElected> =>
api.derive.staking.queryMulti(combineAccounts(nextElected, validators), flags).pipe(
map((info): DeriveStakingElected => ({
info,
nextElected,
validators
}))
)
)
)
);
}