packages/page-staking2/src/useValidatorsAll.ts
// Copyright 2017-2024 @polkadot/app-staking authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Changes } from '@polkadot/react-hooks/useEventChanges';
import type { StorageKey } from '@polkadot/types';
import type { AccountId32, EventRecord } from '@polkadot/types/interfaces';
import type { SessionInfo, Validator } from './types.js';
import { useMemo } from 'react';
import { createNamedHook, useApi, useEventChanges, useMapKeys } from '@polkadot/react-hooks';
import { useCacheValue } from './useCache.js';
import useTaggedValidators from './useTaggedValidators.js';
const EMPTY_PARAMS: unknown[] = [];
const OPT_VALIDATORS = {
transform: (keys: StorageKey<[AccountId32]>[]): AccountId32[] =>
keys.map(({ args: [id] }) => id)
};
function eventFilter (records: EventRecord[]): Changes<AccountId32> {
const added: AccountId32[] = [];
const removed: AccountId32[] = [];
records.forEach(({ event: { data: [id], method } }): void => {
if (method === 'Bonded') {
added.push(id as AccountId32);
} else {
removed.push(id as AccountId32);
}
});
return { added, removed };
}
function mapValidators (validators?: AccountId32[]): Validator[] | undefined {
return validators?.map((a) => {
const stashId = a.toString();
return {
isElected: false,
isFavorite: false,
isOwned: false,
key: `${stashId}::-1`,
stashId,
stashIndex: -1
};
});
}
function useValidatorsAllImpl (favorites: string[], sessionInfo: SessionInfo): Validator[] | undefined {
const { api } = useApi();
const startValue = useMapKeys(api.query.staking.validators, EMPTY_PARAMS, OPT_VALIDATORS);
const validators = useEventChanges([
api.events.staking.Bonded
], eventFilter, startValue);
const validatorsIndexed = useMemo(
() => mapValidators(validators),
[validators]
);
const tagged = useTaggedValidators(favorites, sessionInfo, validatorsIndexed);
return useCacheValue('useValidatorsAll', tagged);
}
export default createNamedHook('useValidatorsAll', useValidatorsAllImpl);