36 lines
1.4 KiB
TypeScript
36 lines
1.4 KiB
TypeScript
// Copyright 2017-2020 @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 { ReferendumIndex } 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, of } from 'rxjs';
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import { switchMap } from 'rxjs/operators';
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import { ApiInterfaceRx } from '@polkadot/api/types';
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import { memo } from '../util';
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export function referendums (api: ApiInterfaceRx): () => Observable<DerivedReferendum[]> {
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return memo((): Observable<DerivedReferendum[]> =>
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// V2 vs V1 (and early V2)
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api.query.democracy?.lowestUnbaked || api.query.democracy?.nextTally
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? api.queryMulti<[ReferendumIndex, ReferendumIndex]>([
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api.query.democracy.lowestUnbaked || api.query.democracy.nextTally,
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api.query.democracy.referendumCount
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]).pipe(
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switchMap(([earliest, referendumCount]): Observable<DerivedReferendum[]> =>
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referendumCount?.gt(earliest) && referendumCount?.gtn(0)
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? api.derive.democracy.referendumInfos(
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[...Array(referendumCount.sub(earliest).toNumber())].map((_, i): BN =>
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earliest.addn(i)
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)
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)
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: of([])
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)
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)
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: of([] as DerivedReferendum[])
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);
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}
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