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time.ts
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time.ts
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import { Utils } from '@aleph-indexer/core'
import { DateTime, DateTimeUnit, Interval } from 'luxon'
const { splitDurationIntoIntervals } = Utils
/**
* Enum for storing the different types of date ranges in level DB.
* Gaps in between the ranges are for adding new ranges.
*/
export enum TimeFrame {
Hour = 30,
Day = 40,
Week = 50,
Month = 60,
Year = 70,
All = 99,
}
/**
* Returns date units for a given time frame.
*/
export const TimeFrameDurationUnitsMap: Record<
TimeFrame,
[DateTimeUnit, number]
> = {
[TimeFrame.Hour]: ['hour', 1],
[TimeFrame.Day]: ['day', 1],
[TimeFrame.Week]: ['week', 1],
[TimeFrame.Month]: ['month', 1],
[TimeFrame.Year]: ['year', 1],
[TimeFrame.All]: ['year', Number.MAX_SAFE_INTEGER],
}
/**
* A simple date range object using unix timestamps.
*/
export type DateRange = {
startDate: number
endDate: number
}
/**
* Returns custom date ranges for a given interval.
* @param interval If string, it should be in ISO 8601 format.
*/
export function getDateRangeFromInterval(
interval: Interval | string,
): DateRange {
const { start, end } =
typeof interval === 'string' ? Interval.fromISO(interval) : interval
return { startDate: start.toMillis(), endDate: end.toMillis() }
}
/**
* Returns Interval objects for our custom date ranges.
* @param dateRange Date range to convert to Interval.
*/
export function getIntervalFromDateRange(dateRange: DateRange): Interval {
return Interval.fromDateTimes(
DateTime.fromMillis(dateRange.startDate).toUTC(),
DateTime.fromMillis(dateRange.endDate).toUTC(),
)
}
// Clip date ranges utils
export type DateRangeArrayOrMap = DateRange[] | Record<string, DateRange>
function clipDateRanges(
ranges: Record<string, DateRange>,
clipRange: DateRange,
): Record<string, DateRange> {
for (const [currentId, currentRange] of Object.entries(ranges)) {
// @note: Clipping on the middle
if (
clipRange.startDate > currentRange.startDate &&
clipRange.startDate < currentRange.endDate &&
clipRange.endDate > currentRange.startDate &&
clipRange.endDate < currentRange.endDate
) {
const leftRange = {
startDate: currentRange.startDate,
endDate: clipRange.startDate - 1,
}
const rightRange = {
startDate: clipRange.endDate + 1,
endDate: currentRange.endDate,
}
const leftId = `${leftRange.startDate}${leftRange.endDate}`
const rightId = `${rightRange.startDate}${rightRange.endDate}`
ranges[leftId] = leftRange
ranges[rightId] = rightRange
delete ranges[currentId]
}
// @note: Clipping from the left
else if (
clipRange.startDate <= currentRange.startDate &&
clipRange.endDate >= currentRange.startDate &&
clipRange.endDate < currentRange.endDate
) {
const rightRange = {
startDate: clipRange.endDate + 1,
endDate: currentRange.endDate,
}
const rightId = `${rightRange.startDate}${rightRange.endDate}`
ranges[rightId] = rightRange
delete ranges[currentId]
}
// @note: Clipping from the right
else if (
clipRange.endDate >= currentRange.endDate &&
clipRange.startDate <= currentRange.endDate &&
clipRange.startDate > currentRange.startDate
) {
const leftRange = {
startDate: currentRange.startDate,
endDate: clipRange.startDate - 1,
}
const leftId = `${leftRange.startDate}${leftRange.endDate}`
ranges[leftId] = leftRange
delete ranges[currentId]
}
// @note: Clipping the whole range
else if (
clipRange.startDate <= currentRange.startDate &&
clipRange.endDate >= currentRange.endDate
) {
delete ranges[currentId]
}
}
return ranges
}
/**
* @todo: needs a better function name, idk what it exactly does but it also sorts the ranges
* @param ranges
* @param clipRanges
* @param log
*/
export async function clipDateRangesFromIterable<T extends DateRangeArrayOrMap>(
ranges: T,
clipRanges: Iterable<DateRange> | AsyncIterable<DateRange>,
): Promise<T> {
let map: Record<string, DateRange> = Array.isArray(ranges)
? Object.fromEntries(
ranges.map((range) => [`${range.startDate}${range.endDate}`, range]),
)
: ranges
for await (const range of clipRanges) {
map = clipDateRanges(map, range)
}
return Array.isArray(ranges)
? Object.values(map).sort((a, b) => a.startDate - b.startDate)
: (map as any)
}
// Merge date ranges utils
// @note: Ranges should be sorted in ascending order
export async function mergeDateRangesFromIterable(
mergeRanges: Iterable<DateRange> | AsyncIterable<DateRange>,
): Promise<{
mergedRanges: DateRange[]
oldRanges: DateRange[]
newRanges: DateRange[]
}> {
const mergedRanges: DateRange[] = []
const oldRanges: DateRange[] = []
const newRanges: DateRange[] = []
let prevRange: DateRange | undefined
let prevMerged = false
for await (const range of mergeRanges) {
if (!prevRange) {
prevRange = range
continue
}
// @note: Merge adjacent ranges
if (prevRange.endDate >= range.startDate - 1) {
const unionRange = {
startDate: prevRange.startDate,
endDate: Math.max(prevRange.endDate, range.endDate),
} as DateRange
const equalToRange = isEqualDateRange(range, unionRange)
const equalToPrevRange = isEqualDateRange(prevRange, unionRange)
if (!equalToRange) {
oldRanges.push(range)
}
if (!prevMerged && !equalToPrevRange) {
oldRanges.push(prevRange)
}
prevMerged = !equalToRange && !equalToPrevRange
prevRange = equalToRange
? range
: equalToPrevRange
? prevRange
: unionRange
continue
}
mergedRanges.push(prevRange)
if (prevMerged) newRanges.push(prevRange)
prevMerged = false
prevRange = range
}
if (prevRange) {
mergedRanges.push(prevRange)
if (prevMerged) newRanges.push(prevRange)
}
return {
mergedRanges,
oldRanges,
newRanges,
}
}
export function isEqualDateRange(a: DateRange, b: DateRange): boolean {
return a.startDate === b.startDate && a.endDate === b.endDate
}
export function getTimeFrameOptions(
timeFrame: TimeFrame,
interval: Interval,
): [DateTime, DateTime, DateTimeUnit, number] {
const duration = TimeFrameDurationUnitsMap[timeFrame]
switch (timeFrame) {
case TimeFrame.Hour:
case TimeFrame.Day:
case TimeFrame.Week:
case TimeFrame.Month:
case TimeFrame.Year:
case TimeFrame.All: {
return [interval.start, interval.end, ...duration]
}
}
}
// @todo: Create a generator function instead for not filling memory on tiny time frames or/and large intervals
export function getTimeFrameIntervals(
interval: Interval,
timeFrame: TimeFrame,
reverse = false,
): Interval[] {
if (timeFrame === TimeFrame.All) {
return [
Interval.fromISO('1970-01-01T00:00:00.000Z/2285-01-01T00:00:00.000Z'),
]
}
const options = getTimeFrameOptions(timeFrame, interval)
const ranges = splitDurationIntoIntervals(...options)
return reverse ? ranges.reverse() : ranges
}
export function getPreviousInterval(
interval: Interval,
timeFrame: TimeFrame,
reverse = false,
): Interval {
if (timeFrame === TimeFrame.All)
throw new Error('TimeFrame.All does not have a prev interval')
const [unit, num] = TimeFrameDurationUnitsMap[timeFrame]
const durationObj = { [unit]: num }
return reverse
? Interval.after(interval.end, durationObj)
: Interval.before(interval.start, durationObj)
}
export function getNextInterval(
interval: Interval,
timeFrame: TimeFrame,
reverse = false,
): Interval {
if (timeFrame === TimeFrame.All)
throw new Error('TimeFrame.All does not have a next interval')
const [unit, num] = TimeFrameDurationUnitsMap[timeFrame]
const durationObj = { [unit]: num }
return reverse
? Interval.before(interval.start, durationObj)
: Interval.after(interval.end, durationObj)
}