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- // Copyright 2017-2020 @polkadot/app-council authors & contributors
- // This software may be modified and distributed under the terms
- // of the Apache-2.0 license. See the LICENSE file for details.
- import { DeriveSessionIndexes } from '@polkadot/api-derive/types';
- import { EraIndex, UnappliedSlash } from '@polkadot/types/interfaces';
- import BN from 'bn.js';
- import { useEffect, useState } from 'react';
- import { useApi, useCall, useIsMountedRef } from '@polkadot/react-hooks';
- import { Option, Vec } from '@polkadot/types';
- type Unsub = () => void;
- export default function useAvailableSlashes (): [BN, UnappliedSlash[]][] {
- const { api } = useApi();
- const indexes = useCall<DeriveSessionIndexes>(api.derive.session?.indexes, []);
- const earliestSlash = useCall<Option<EraIndex>>(api.query.staking?.earliestUnappliedSlash, []);
- const mountedRef = useIsMountedRef();
- const [slashes, setSlashes] = useState<[BN, UnappliedSlash[]][]>([]);
- useEffect((): Unsub => {
- let unsub: Unsub | undefined;
- if (mountedRef.current && indexes && earliestSlash && earliestSlash.isSome) {
- const from = earliestSlash.unwrap();
- const range: BN[] = [];
- let start = new BN(from);
- while (start.lt(indexes.activeEra)) {
- range.push(start);
- start = start.addn(1);
- }
- if (range.length) {
- (async (): Promise<void> => {
- unsub = await api.query.staking.unappliedSlashes.multi<Vec<UnappliedSlash>>(range, (values): void => {
- mountedRef.current && setSlashes(
- values
- .map((value, index): [BN, UnappliedSlash[]] => [from.addn(index), value])
- .filter(([, slashes]): boolean => slashes.length !== 0)
- );
- });
- })().catch(console.error);
- }
- }
- return (): void => {
- unsub && unsub();
- };
- }, [api, earliestSlash, indexes, mountedRef]);
- return slashes;
- }
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