38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
// Copyright 2017-2021 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { AugmentedEvent } from '@polkadot/api/types';
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import type { Vec } from '@polkadot/types';
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import type { EventRecord } from '@polkadot/types/interfaces';
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import { useEffect, useState } from 'react';
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import { isString } from '@polkadot/util';
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import { useApi } from './useApi';
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import { useCall } from './useCall';
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import { useIsMountedRef } from './useIsMountedRef';
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type EventCheck = AugmentedEvent<'promise'> | string | false | undefined | null;
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const IDENTITY_FILTER = () => true;
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export function useEventTrigger (checks: EventCheck[], filter: (record: EventRecord) => boolean = IDENTITY_FILTER): string {
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const { api } = useApi();
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const [trigger, setTrigger] = useState('0');
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const mountedRef = useIsMountedRef();
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const eventRecords = useCall<Vec<EventRecord>>(api.query.system.events);
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useEffect((): void => {
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mountedRef.current && eventRecords && eventRecords.filter((r) =>
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r.event && checks.some((check) => check && (
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isString(check)
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? r.event.section === check
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: check.is(r.event)
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)) && filter(r)
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).length && setTrigger(() => eventRecords.createdAtHash?.toHex() || '');
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}, [eventRecords, checks, filter, mountedRef]);
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return trigger;
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}
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