54 lines
1.8 KiB
TypeScript
54 lines
1.8 KiB
TypeScript
// Copyright 2017-2020 @polkadot/app-council authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import { DeriveSessionIndexes } from '@polkadot/api-derive/types';
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import { EraIndex, UnappliedSlash } from '@polkadot/types/interfaces';
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import BN from 'bn.js';
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import { useEffect, useState } from 'react';
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import { useApi, useCall, useIsMountedRef } from '@polkadot/react-hooks';
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import { Option, Vec } from '@polkadot/types';
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type Unsub = () => void;
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export default function useAvailableSlashes (): [BN, UnappliedSlash[]][] {
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const { api } = useApi();
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const indexes = useCall<DeriveSessionIndexes>(api.derive.session?.indexes);
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const earliestSlash = useCall<Option<EraIndex>>(api.query.staking?.earliestUnappliedSlash);
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const mountedRef = useIsMountedRef();
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const [slashes, setSlashes] = useState<[BN, UnappliedSlash[]][]>([]);
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useEffect((): Unsub => {
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let unsub: Unsub | undefined;
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if (mountedRef.current && indexes && earliestSlash && earliestSlash.isSome) {
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const from = earliestSlash.unwrap();
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const range: BN[] = [];
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let start = new BN(from);
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while (start.lt(indexes.activeEra)) {
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range.push(start);
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start = start.addn(1);
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}
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if (range.length) {
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(async (): Promise<void> => {
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unsub = await api.query.staking.unappliedSlashes.multi<Vec<UnappliedSlash>>(range, (values): void => {
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mountedRef.current && setSlashes(
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values
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.map((value, index): [BN, UnappliedSlash[]] => [from.addn(index), value])
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.filter(([, slashes]) => slashes.length)
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);
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});
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})().catch(console.error);
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}
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}
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return (): void => {
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unsub && unsub();
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};
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}, [api, earliestSlash, indexes, mountedRef]);
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return slashes;
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}
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