55 lines
1.9 KiB
TypeScript
55 lines
1.9 KiB
TypeScript
// Copyright 2017-2022 @polkadot/api-derive authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { Observable } from 'rxjs';
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import type { EraIndex } from '@polkadot/types/interfaces';
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import type { PalletStakingEraRewardPoints } from '@polkadot/types/lookup';
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import type { DeriveApi, DeriveEraPoints, DeriveEraValPoints } from '../types';
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import { map, of } from 'rxjs';
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import { BN_ZERO } from '@polkadot/util';
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import { memo } from '../util';
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import { filterCachedEras, getEraMultiCache, setEraMultiCache } from './cache';
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import { erasHistoricApply, filterEras } from './util';
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const CACHE_KEY = 'eraPoints';
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function mapValidators ({ individual }: PalletStakingEraRewardPoints): DeriveEraValPoints {
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return [...individual.entries()]
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.filter(([, points]) => points.gt(BN_ZERO))
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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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function mapPoints (eras: EraIndex[], points: PalletStakingEraRewardPoints[]): DeriveEraPoints[] {
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return 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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export function _erasPoints (instanceId: string, api: DeriveApi): (eras: EraIndex[], withActive: boolean) => Observable<DeriveEraPoints[]> {
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return memo(instanceId, (eras: EraIndex[], withActive: boolean): Observable<DeriveEraPoints[]> => {
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if (!eras.length) {
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return of([]);
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}
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const cached = getEraMultiCache<DeriveEraPoints>(CACHE_KEY, eras, withActive);
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const remaining = filterEras(eras, cached);
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return !remaining.length
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? of(cached)
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: api.query.staking.erasRewardPoints.multi(remaining).pipe(
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map((p) => filterCachedEras(eras, cached, setEraMultiCache(CACHE_KEY, withActive, mapPoints(remaining, p))))
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);
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});
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}
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export const erasPoints = erasHistoricApply('_erasPoints');
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