packages/page-ranked/src/useMemberIds.ts
// Copyright 2017-2024 @polkadot/app-referenda 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 { PalletColl } from './types.js';
import { createNamedHook, useApi, useEventChanges, useMapKeys } from '@polkadot/react-hooks';
const OPT_ID = {
transform: (keys: StorageKey<[AccountId32]>[]): AccountId32[] =>
keys.map(({ args: [id] }) => id)
};
function filter (records: EventRecord[]): Changes<AccountId32> {
const added: AccountId32[] = [];
const removed: AccountId32[] = [];
records.forEach(({ event: { data: [id], method } }): void => {
if (method === 'MemberAdded') {
added.push(id as AccountId32);
} else {
removed.push(id as AccountId32);
}
});
return { added, removed };
}
function useMemberIdsImpl (collective: PalletColl): AccountId32[] | undefined {
const { api } = useApi();
const startValue = useMapKeys(api.query[collective].members, [], OPT_ID);
return useEventChanges([
api.events[collective].MemberAdded,
api.events[collective].MemberRemoved
], filter, startValue);
}
export default createNamedHook('useMemberIds', useMemberIdsImpl);