Jaco Greeff
906732bcdc
* Add 6x to conviction * Add derive.democracy.proposals * Proposal decoding * Don't return empty proposals * Rework referendumInfo * Update referendumInfo extraction
36 lines
1.4 KiB
TypeScript
36 lines
1.4 KiB
TypeScript
// Copyright 2017-2019 @polkadot/api-derive authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import { ReferendumInfo } from '@polkadot/types/interfaces/democracy';
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import { DerivedReferendum } from '../types';
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import BN from 'bn.js';
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import { Observable, combineLatest, of } from 'rxjs';
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import { map, switchMap } from 'rxjs/operators';
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import { ApiInterfaceRx } from '@polkadot/api/types';
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import { Option, Vec } from '@polkadot/types';
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import { memo } from '../util';
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import { retrieveInfo } from './referendumInfo';
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export function referendumInfos (api: ApiInterfaceRx): (ids?: (BN | number)[]) => Observable<DerivedReferendum[]> {
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return memo((ids: (BN | number)[] = []): Observable<DerivedReferendum[]> =>
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(
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!ids || !ids.length
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? of([] as Option<ReferendumInfo>[])
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: api.query.democracy.referendumInfoOf.multi(ids) as Observable<Vec<Option<ReferendumInfo>>>
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).pipe(
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switchMap((infos): Observable<(DerivedReferendum | null)[]> =>
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combineLatest(
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...ids.map((id, index): Observable<DerivedReferendum | null> =>
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retrieveInfo(api, id, infos[index])
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)
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)
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),
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map((infos): DerivedReferendum[] =>
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infos.filter((referendum): boolean => !!referendum) as DerivedReferendum[]
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)
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));
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}
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