packages/page-whitelist/src/useHashes.ts
// Copyright 2017-2024 @polkadot/app-preimages authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Changes } from '@polkadot/react-hooks/useEventChanges';
import type { StorageKey } from '@polkadot/types';
import type { EventRecord, Hash } from '@polkadot/types/interfaces';
import type { HexString } from '@polkadot/util/types';
import { useMemo } from 'react';
import { createNamedHook, useApi, useEventChanges, useMapKeys } from '@polkadot/react-hooks';
const OPT_HASH = {
transform: (keys: StorageKey<[Hash]>[]): Hash[] =>
keys.map(({ args: [hash] }) => hash)
};
function filter (records: EventRecord[]): Changes<Hash> {
const added: Hash[] = [];
const removed: Hash[] = [];
records.forEach(({ event: { data: [hash], method } }): void => {
if (method === 'CallWhitelisted') {
added.push(hash as Hash);
} else {
removed.push(hash as Hash);
}
});
return { added, removed };
}
function useHashesImpl (): HexString[] | undefined {
const { api } = useApi();
const startValue = useMapKeys(api.query.whitelist.whitelistedCall, [], OPT_HASH);
const hashes = useEventChanges([
api.events.whitelist.CallWhitelisted,
api.events.whitelist.WhitelistedCallRemoved
], filter, startValue);
return useMemo(
() => hashes?.map((h) => h.toHex()),
[hashes]
);
}
export default createNamedHook('useHashes', useHashesImpl);