packages/page-staking/src/Query/ChartPrefs.tsx
// Copyright 2017-2024 @polkadot/app-staking authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { DeriveStakerPrefs } from '@polkadot/api-derive/types';
import type { LineData, Props } from './types.js';
import React, { useEffect, useMemo, useRef, useState } from 'react';
import { useApi, useCall } from '@polkadot/react-hooks';
import { BN, BN_BILLION } from '@polkadot/util';
import { useTranslation } from '../translate.js';
import Chart from './Chart.js';
const MULT = new BN(100 * 100);
const COLORS_POINTS = [undefined, '#acacac'];
function extractPrefs (labels: string[], prefs: DeriveStakerPrefs[]): LineData {
const avgSet = new Array<number>(labels.length);
const idxSet = new Array<number>(labels.length);
const [total, avgCount] = prefs.reduce(([total, avgCount], { validatorPrefs }) => {
const comm = validatorPrefs.commission.unwrap().mul(MULT).div(BN_BILLION).toNumber() / 100;
if (comm !== 0) {
total += comm;
avgCount++;
}
return [total, avgCount];
}, [0, 0]);
prefs.forEach(({ era, validatorPrefs }): void => {
const comm = validatorPrefs.commission.unwrap().mul(MULT).div(BN_BILLION).toNumber() / 100;
const avg = avgCount > 0
? Math.ceil(total * 100 / avgCount) / 100
: 0;
const index = labels.indexOf(era.toHuman());
if (index !== -1) {
avgSet[index] = avg;
idxSet[index] = comm;
}
});
return [idxSet, avgSet];
}
function ChartPrefs ({ labels, validatorId }: Props): React.ReactElement<Props> {
const { t } = useTranslation();
const { api } = useApi();
const params = useMemo(() => [validatorId, false], [validatorId]);
const stakerPrefs = useCall<DeriveStakerPrefs[]>(api.derive.staking.stakerPrefs, params);
const [values, setValues] = useState<LineData>([]);
useEffect(
() => setValues([]),
[validatorId]
);
useEffect(
() => stakerPrefs && setValues(extractPrefs(labels, stakerPrefs)),
[labels, stakerPrefs]
);
const legendsRef = useRef([
t('commission'),
t('average')
]);
return (
<Chart
colors={COLORS_POINTS}
labels={labels}
legends={legendsRef.current}
title={t('commission')}
values={values}
/>
);
}
export default React.memo(ChartPrefs);