server/lib/timeserie.ts

   1 import { logger } from '@server/helpers/logger'
   2
   3 function buildGroupByAndBoundaries (startDateString: string, endDateString: string) {
   4   const startDate = new Date(startDateString)
   5   const endDate = new Date(endDateString)
   6
   7   const groupInterval = buildGroupInterval(startDate, endDate)
   8
   9   logger.debug('Found "%s" group interval.', groupInterval, { startDate, endDate })
  10
  11   // Remove parts of the date we don't need
  12   if (groupInterval.endsWith(' day') || groupInterval.endsWith(' days')) {
  13     startDate.setHours(0, 0, 0, 0)
  14   } else if (groupInterval.endsWith(' hour') || groupInterval.endsWith(' hours')) {
  15     startDate.setMinutes(0, 0, 0)
  16   } else {
  17     startDate.setSeconds(0, 0)
  18   }
  19
  20   return {
  21     groupInterval,
  22     startDate,
  23     endDate
  24   }
  25 }
  26
  27 // ---------------------------------------------------------------------------
  28
  29 export {
  30   buildGroupByAndBoundaries
  31 }
  32
  33 // ---------------------------------------------------------------------------
  34
  35 function buildGroupInterval (startDate: Date, endDate: Date): string {
  36   const aDay = 86400
  37   const anHour = 3600
  38   const aMinute = 60
  39
  40   const diffSeconds = (endDate.getTime() - startDate.getTime()) / 1000
  41
  42   if (diffSeconds >= 15 * aDay) return '1 day'
  43   if (diffSeconds >= 8 * aDay) return '12 hours'
  44   if (diffSeconds >= 4 * aDay) return '6 hours'
  45   if (diffSeconds >= 15 * anHour) return '1 hour'
  46   if (diffSeconds >= 180 * aMinute) return '10 minutes'
  47
  48   return '1 minute'
  49 }