48 lines
2 KiB
TypeScript
48 lines
2 KiB
TypeScript
/*
|
|
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
|
|
* or more contributor license agreements. Licensed under the Elastic License;
|
|
* you may not use this file except in compliance with the Elastic License.
|
|
*/
|
|
|
|
import { duration, Duration, unitOfTime } from 'moment';
|
|
import dateMath from '@elastic/datemath';
|
|
|
|
type SupportedUnits = unitOfTime.Base;
|
|
|
|
// Assume interval is in the form (value)(unit), such as "1h"
|
|
const INTERVAL_STRING_RE = new RegExp('^([0-9]*)\\s*(' + dateMath.units.join('|') + ')$');
|
|
|
|
// moment.js is only designed to allow fractional values between 0 and 1
|
|
// for units of hour or less.
|
|
const SUPPORT_ZERO_DURATION_UNITS: SupportedUnits[] = ['ms', 's', 'm', 'h'];
|
|
|
|
// Parses an interval String, such as 7d, 1h or 30m to a moment duration.
|
|
// Differs from the Kibana ui/utils/parse_interval in the following ways:
|
|
// 1. A value-less interval such as 'm' is not allowed - in line with the ML back-end
|
|
// not accepting such interval Strings for the bucket span of a job.
|
|
// 2. Zero length durations 0ms, 0s, 0m and 0h are accepted as-is.
|
|
// Note that when adding or subtracting fractional durations, moment is only designed
|
|
// to work with units less than 'day'.
|
|
// 3. Fractional intervals e.g. 1.5h or 4.5d are not allowed, in line with the behaviour
|
|
// of the Elasticsearch date histogram aggregation.
|
|
export function parseInterval(interval: string): Duration | null {
|
|
const matches = String(interval).trim().match(INTERVAL_STRING_RE);
|
|
if (!Array.isArray(matches) || matches.length < 3) {
|
|
return null;
|
|
}
|
|
|
|
try {
|
|
const value = parseInt(matches[1], 10);
|
|
const unit = matches[2] as SupportedUnits;
|
|
|
|
// In line with moment.js, only allow zero value intervals when the unit is less than 'day'.
|
|
// And check for isNaN as e.g. valueless 'm' will pass the regex test.
|
|
if (isNaN(value) || (value < 1 && SUPPORT_ZERO_DURATION_UNITS.indexOf(unit) === -1)) {
|
|
return null;
|
|
}
|
|
|
|
return duration(value, unit);
|
|
} catch (e) {
|
|
return null;
|
|
}
|
|
}
|