45 lines
1.6 KiB
TypeScript
45 lines
1.6 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 { ApiInterfaceRx } from '@polkadot/api/types';
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import { EraIndex, EraRewardPoints } from '@polkadot/types/interfaces';
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import { DeriveEraPoints, DeriveEraValPoints } from '../types';
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import { Observable, combineLatest, of } from 'rxjs';
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import { map, switchMap, take } from 'rxjs/operators';
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import { memo } from '../util';
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function mapValidators ({ individual }: EraRewardPoints): DeriveEraValPoints {
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return [...individual.entries()]
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.filter(([, points]): boolean => points.gtn(0))
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.reduce((result: DeriveEraValPoints, [validatorId, points]): DeriveEraValPoints => {
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result[validatorId.toString()] = points;
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return result;
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}, {});
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}
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export function erasPoints (api: ApiInterfaceRx): (withActive?: boolean) => Observable<DeriveEraPoints[]> {
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return memo((withActive?: boolean): Observable<DeriveEraPoints[]> =>
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api.derive.staking.erasHistoric(withActive).pipe(
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switchMap((indexes): Observable<[EraIndex[], EraRewardPoints[]]> =>
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combineLatest([
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of(indexes),
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indexes.length
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? api.query.staking.erasRewardPoints.multi<EraRewardPoints>(indexes).pipe(take(1))
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: of([])
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])
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),
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map(([eras, points]): DeriveEraPoints[] =>
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eras.map((era, index): DeriveEraPoints => ({
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era,
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eraPoints: points[index].total,
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validators: mapValidators(points[index])
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}))
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)
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)
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);
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}
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