packages/page-staking-legacy/src/useNominations.ts
// Copyright 2017-2024 @polkadot/app-staking authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Option, StorageKey } from '@polkadot/types';
import type { Nominations } from '@polkadot/types/interfaces';
import type { NominatedByMap } from './types.js';
import { useMemo } from 'react';
import { createNamedHook, useApi, useCall } from '@polkadot/react-hooks';
function extractNominators (nominations: [StorageKey, Option<Nominations>][]): NominatedByMap {
const mapped: NominatedByMap = {};
for (let i = 0, nomCount = nominations.length; i < nomCount; i++) {
const [key, optNoms] = nominations[i];
if (optNoms.isSome && key.args.length) {
const nominatorId = key.args[0].toString();
const { submittedIn, targets } = optNoms.unwrap();
for (let j = 0, tarCount = targets.length; j < tarCount; j++) {
const validatorId = targets[j].toString();
if (!mapped[validatorId]) {
mapped[validatorId] = [];
}
mapped[validatorId].push({ index: j + 1, nominatorId, submittedIn });
}
}
}
return mapped;
}
function useNominationsImpl (isActive = true): NominatedByMap | undefined {
const { api } = useApi();
const nominators = useCall<[StorageKey, Option<Nominations>][]>(isActive && api.query.staking.nominators.entries);
return useMemo(
() => nominators && extractNominators(nominators),
[nominators]
);
}
export default createNamedHook('useNominations', useNominationsImpl);