91 lines
2.6 KiB
TypeScript
91 lines
2.6 KiB
TypeScript
// Copyright 2017-2021 @polkadot/app-staking authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { DeriveOwnExposure } from '@polkadot/api-derive/types';
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import type { ChartInfo, LineDataEntry, Props } from './types';
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import BN from 'bn.js';
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import React, { useMemo } 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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// Darwinia Crab doesn't have the total field
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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 params = useMemo(() => [validatorId, false], [validatorId]);
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const ownExposures = useCall<DeriveOwnExposure[]>(api.derive.staking.ownExposures, params);
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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 { chart, labels } = useMemo(
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() => extractStake(ownExposures, divisor),
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[divisor, ownExposures]
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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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return (
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<div className='staking--Chart'>
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<h1>{t<string>('elected stake')}</h1>
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{labels.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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