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umami/components/metrics/RealtimeChart.js

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import React, { useMemo, useRef } from 'react';
import { format, parseISO, startOfMinute, subMinutes, isBefore } from 'date-fns';
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import PageviewsChart from './PageviewsChart';
import { getDateArray } from 'lib/date';
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import { DEFAULT_ANIMATION_DURATION, REALTIME_RANGE } from 'lib/constants';
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function mapData(data) {
let last = 0;
const arr = [];
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data.reduce((obj, val) => {
const { created_at } = val;
const t = startOfMinute(parseISO(created_at));
if (t.getTime() > last) {
obj = { t: format(t, 'yyyy-LL-dd HH:mm:00'), y: 1 };
arr.push(obj);
last = t;
} else {
obj.y += 1;
}
return obj;
}, {});
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return arr;
}
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export default function RealtimeChart({ data, unit, ...props }) {
const endDate = startOfMinute(new Date());
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const startDate = subMinutes(endDate, REALTIME_RANGE);
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const prevEndDate = useRef(endDate);
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const chartData = useMemo(() => {
if (data) {
return {
pageviews: getDateArray(mapData(data.pageviews), startDate, endDate, unit),
sessions: getDateArray(mapData(data.sessions), startDate, endDate, unit),
};
}
return { pageviews: [], sessions: [] };
}, [data]);
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// Don't animate the bars shifting over because it looks weird
const animationDuration = useMemo(() => {
if (isBefore(prevEndDate.current, endDate)) {
prevEndDate.current = endDate;
return 0;
}
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return DEFAULT_ANIMATION_DURATION;
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}, [data]);
return (
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<PageviewsChart
{...props}
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height={200}
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unit={unit}
data={chartData}
animationDuration={animationDuration}
/>
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);
}