89 lines
2.7 KiB
TypeScript
89 lines
2.7 KiB
TypeScript
// Copyright 2017-2020 @polkadot/app-staking authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import { DeriveOwnExposure } from '@polkadot/api-derive/types';
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import { ChartInfo, LineDataEntry, Props } from './types';
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import BN from 'bn.js';
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import React, { useEffect, useMemo, useState } from 'react';
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import { Chart, Spinner } from '@polkadot/react-components';
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import { useApi, useCall } from '@polkadot/react-hooks';
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import { formatBalance } from '@polkadot/util';
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import { useTranslation } from '../translate';
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import { balanceToNumber } from './util';
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const COLORS_STAKE = [undefined, '#8c2200', '#acacac'];
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function extractStake (exposures: DeriveOwnExposure[], divisor: BN): ChartInfo {
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const labels: string[] = [];
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const cliSet: LineDataEntry = [];
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const expSet: LineDataEntry = [];
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const avgSet: LineDataEntry = [];
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let avgCount = 0;
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let total = 0;
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exposures.forEach(({ clipped, era, exposure }): void => {
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const cli = balanceToNumber(clipped.total.unwrap(), divisor);
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const exp = balanceToNumber(exposure.total.unwrap(), divisor);
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total += cli;
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if (cli > 0) {
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avgCount++;
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}
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avgSet.push((avgCount ? Math.ceil(total * 100 / avgCount) : 0) / 100);
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labels.push(era.toHuman());
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cliSet.push(cli);
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expSet.push(exp);
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});
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return {
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chart: [cliSet, expSet, avgSet],
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labels
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};
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}
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function ChartStake ({ validatorId }: Props): React.ReactElement<Props> {
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const { t } = useTranslation();
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const { api } = useApi();
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const [{ chart, labels }, setChart] = useState<ChartInfo>({ chart: [], labels: [] });
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const ownExposures = useCall<DeriveOwnExposure[]>(api.derive.staking.ownExposures, [validatorId, true]);
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const { currency, divisor } = useMemo((): { currency: string; divisor: BN } => ({
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currency: formatBalance.getDefaults().unit,
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divisor: new BN('1'.padEnd(formatBalance.getDefaults().decimals + 1, '0'))
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}), []);
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const legends = useMemo(() => [
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t<string>('{{currency}} clipped', { replace: { currency } }),
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t<string>('{{currency}} total', { replace: { currency } }),
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t<string>('{{currency}} average', { replace: { currency } })
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], [currency, t]);
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useEffect((): void => {
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ownExposures && setChart(
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extractStake(ownExposures, divisor)
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);
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}, [divisor, ownExposures]);
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return (
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<div className='staking--Chart'>
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<h1>{t<string>('elected stake')}</h1>
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{chart && !!chart[0]?.length
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? (
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<Chart.Line
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colors={COLORS_STAKE}
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labels={labels}
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legends={legends}
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values={chart}
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/>
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)
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: <Spinner />
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}
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</div>
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);
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}
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export default React.memo(ChartStake);
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