packages/react-hooks/src/useApiUrl.ts
// Copyright 2017-2024 @polkadot/react-hooks authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { ProviderInterface } from '@polkadot/rpc-provider/types';
import { useEffect, useMemo, useRef, useState } from 'react';
import { ApiPromise, WsProvider } from '@polkadot/api';
import { typesBundle } from '@polkadot/apps-config';
import { arrayShuffle, isString } from '@polkadot/util';
import { createNamedHook } from './createNamedHook.js';
import { useIsMountedRef } from './useIsMountedRef.js';
function disconnect (provider: ProviderInterface | null): null {
provider?.disconnect().catch(console.error);
return null;
}
function useApiUrlImpl (url?: null | string | string[]): ApiPromise | null {
const providerRef = useRef<ProviderInterface | null>(null);
const mountedRef = useIsMountedRef();
const [state, setState] = useState<ApiPromise | null>(null);
const urls = useMemo(
() => url
? isString(url)
? [url]
: arrayShuffle(url.filter((u) => !u.startsWith('light://')))
: [],
[url]
);
useEffect((): () => void => {
return (): void => {
providerRef.current = disconnect(providerRef.current);
};
}, []);
useEffect((): void => {
setState(null);
providerRef.current = disconnect(providerRef.current);
urls.length &&
ApiPromise
.create({
provider: (providerRef.current = new WsProvider(urls)),
typesBundle
})
.then((api) => mountedRef.current && setState(api))
.catch(console.error);
}, [mountedRef, providerRef, urls]);
return state;
}
export const useApiUrl = createNamedHook('useApiUrl', useApiUrlImpl);