66 lines
1.5 KiB
TypeScript
66 lines
1.5 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 BN from 'bn.js';
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import type { LinkOption } from '@polkadot/apps-config/endpoints/types';
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import { useEffect, useState } from 'react';
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import { ApiPromise } from '@polkadot/api';
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import { useApiUrl } from './useApiUrl';
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import { useIsMountedRef } from './useIsMountedRef';
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import { useParaEndpoints } from './useParaEndpoints';
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interface Result {
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api?: ApiPromise | null;
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endpoints: LinkOption[];
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urls: string[];
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}
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// use from @polkadot/util
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function arrayShuffle (result: string[]): string[] {
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let currentIndex = result.length;
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while (currentIndex !== 0) {
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const randomIndex = Math.floor(Math.random() * currentIndex);
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currentIndex--;
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[result[currentIndex], result[randomIndex]] = [
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result[randomIndex], result[currentIndex]
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];
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}
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return result;
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}
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export function useParaApi (paraId: BN | number): Result {
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const mountedRef = useIsMountedRef();
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const endpoints = useParaEndpoints(paraId);
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const [state, setState] = useState<Result>(() => ({
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api: null,
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endpoints,
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urls: []
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}));
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const api = useApiUrl(state.urls);
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useEffect((): void => {
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mountedRef.current && setState({
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api: null,
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endpoints,
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urls: arrayShuffle(endpoints.map(({ value }) => value))
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});
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}, [endpoints, mountedRef]);
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useEffect((): void => {
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mountedRef.current && setState(({ endpoints, urls }) => ({
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api,
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endpoints,
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urls
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}));
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}, [api, mountedRef]);
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return state;
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}
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