45 lines
1.4 KiB
TypeScript
45 lines
1.4 KiB
TypeScript
// Copyright 2017-2021 @polkadot/app-staking authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { Option, StorageKey } from '@polkadot/types';
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import type { Nominations } from '@polkadot/types/interfaces';
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import type { NominatedBy } from './types';
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import { useMemo } from 'react';
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import { useApi, useCall } from '@polkadot/react-hooks';
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type Result = Record<string, NominatedBy[]>;
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function extractNominators (nominations: [StorageKey, Option<Nominations>][]): Result {
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return nominations.reduce((mapped: Result, [key, optNoms]) => {
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if (optNoms.isSome && key.args.length) {
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const nominatorId = key.args[0].toString();
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const { submittedIn, targets } = optNoms.unwrap();
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targets.forEach((_validatorId, index): void => {
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const validatorId = _validatorId.toString();
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const info = { index: index + 1, nominatorId, submittedIn };
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if (!mapped[validatorId]) {
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mapped[validatorId] = [info];
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} else {
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mapped[validatorId].push(info);
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}
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});
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}
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return mapped;
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}, {});
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}
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export default function useNominations (isActive = true): Result | undefined {
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const { api } = useApi();
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const nominators = useCall<[StorageKey, Option<Nominations>][]>(isActive && api.query.staking.nominators.entries);
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return useMemo(
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() => nominators && extractNominators(nominators),
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[nominators]
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);
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}
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