wehub-resource-sync
73 lines
1.9 KiB
TypeScript
73 lines
1.9 KiB
TypeScript
import { parseExpression } from "cron-parser";
|
|
|
|
export function calculateNextScheduledTimestampFromNow(schedule: string, timezone: string | null) {
|
|
return calculateNextScheduledTimestamp(schedule, timezone, new Date());
|
|
}
|
|
|
|
export function calculateNextScheduledTimestamp(
|
|
schedule: string,
|
|
timezone: string | null,
|
|
lastScheduledTimestamp: Date = new Date()
|
|
) {
|
|
const nextStep = calculateNextStep(schedule, timezone, lastScheduledTimestamp);
|
|
|
|
if (nextStep.getTime() < Date.now()) {
|
|
// If the next step is in the past, we just need to calculate the next step from now
|
|
return calculateNextStep(schedule, timezone, new Date());
|
|
}
|
|
|
|
return nextStep;
|
|
}
|
|
|
|
function calculateNextStep(schedule: string, timezone: string | null, currentDate: Date) {
|
|
return parseExpression(schedule, {
|
|
currentDate,
|
|
utc: timezone === null,
|
|
tz: timezone ?? undefined,
|
|
})
|
|
.next()
|
|
.toDate();
|
|
}
|
|
|
|
/**
|
|
* Cron's previous slot relative to `fromTimestamp`. For a continuously-
|
|
* running schedule this equals the actual last fire time; for paused or
|
|
* DST-edge cases it's an approximation. Used only on the recovery path
|
|
* where the actual last fire isn't recoverable from in-flight worker state.
|
|
*/
|
|
export function previousScheduledTimestamp(
|
|
cron: string,
|
|
timezone: string | null,
|
|
fromTimestamp: Date = new Date()
|
|
) {
|
|
return parseExpression(cron, {
|
|
currentDate: fromTimestamp,
|
|
utc: timezone === null,
|
|
tz: timezone ?? undefined,
|
|
})
|
|
.prev()
|
|
.toDate();
|
|
}
|
|
|
|
export function nextScheduledTimestamps(
|
|
cron: string,
|
|
timezone: string | null,
|
|
lastScheduledTimestamp: Date,
|
|
count: number = 1
|
|
) {
|
|
const result: Array<Date> = [];
|
|
let nextScheduledTimestamp = lastScheduledTimestamp;
|
|
|
|
for (let i = 0; i < count; i++) {
|
|
nextScheduledTimestamp = calculateNextScheduledTimestamp(
|
|
cron,
|
|
timezone,
|
|
nextScheduledTimestamp
|
|
);
|
|
|
|
result.push(nextScheduledTimestamp);
|
|
}
|
|
|
|
return result;
|
|
}
|