79 lines
1.9 KiB
JavaScript
79 lines
1.9 KiB
JavaScript
import moment from 'moment';
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const d = moment.duration;
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const roundingRules = [
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[d(500, 'ms'), d(100, 'ms')],
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[d(5, 'second'), d(1, 'second')],
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[d(7.5, 'second'), d(5, 'second')],
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[d(15, 'second'), d(10, 'second')],
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[d(45, 'second'), d(30, 'second')],
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[d(3, 'minute'), d(1, 'minute')],
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[d(9, 'minute'), d(5, 'minute')],
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[d(20, 'minute'), d(10, 'minute')],
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[d(45, 'minute'), d(30, 'minute')],
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[d(2, 'hour'), d(1, 'hour')],
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[d(6, 'hour'), d(3, 'hour')],
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[d(24, 'hour'), d(12, 'hour')],
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[d(1, 'week'), d(1, 'd')],
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[d(3, 'week'), d(1, 'week')],
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[d(1, 'year'), d(1, 'month')],
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[Infinity, d(1, 'year')],
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];
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function find(rules, check) {
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function pick(buckets, duration) {
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const target = duration / buckets;
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let lastResp;
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for (let i = 0; i < rules.length; i++) {
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const rule = rules[i];
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const resp = check(rule[0], rule[1], target);
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if (resp == null) {
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if (lastResp) {
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return lastResp;
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}
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break;
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}
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lastResp = resp;
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}
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// fallback to just a number of milliseconds, ensure ms is >= 1
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const ms = Math.max(Math.floor(target), 1);
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return moment.duration(ms, 'ms');
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}
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return function (buckets, duration) {
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const interval = pick(buckets, duration);
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if (interval) {
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return moment.duration(interval._data);
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}
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};
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}
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const revRoundingRules = roundingRules.slice(0).reverse();
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/*
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* 24 hours: 600 seconds
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* 12 hours: 300 seconds
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* 4 hours: 60 seconds
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* 1 hour: 30 seconds
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* 15 minutes: 10 seconds
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*/
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export const calculateAuto = find(revRoundingRules, (bound, interval, target) => {
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if (bound > target) {
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return interval;
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}
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});
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export function calculateTimeseriesInterval(
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lowerBoundInMsSinceEpoch,
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upperBoundInMsSinceEpoch,
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minIntervalSeconds
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) {
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const duration = moment.duration(upperBoundInMsSinceEpoch - lowerBoundInMsSinceEpoch, 'ms');
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return Math.max(minIntervalSeconds, calculateAuto(100, duration).asSeconds());
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} |