yakworks.rally.job.MaintWindowUtil.groovy Maven / Gradle / Ivy
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gorm domain models for core app and testing
/*
* Copyright 2023 Yak.Works - Licensed under the Apache License, Version 2.0 (the "License")
* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*/
package yakworks.rally.job
import java.time.LocalDateTime
import java.time.ZoneId
import java.time.temporal.ChronoUnit
import java.time.temporal.Temporal
import groovy.transform.CompileStatic
import org.springframework.scheduling.support.CronExpression
import yakworks.api.problem.ProblemResult
import yakworks.rally.config.MaintenanceProps
/**
* Tools to help parse a cron expression and see if we are inside a maintenance window
*/
@CompileStatic
class MaintWindowUtil {
static boolean check(MaintenanceProps mprops){
return check(mprops.crons, mprops.timeZone?.toZoneId())
}
static boolean check(List cronList, ZoneId zoneId = null){
return checkWindows(cronList, currentTime(zoneId))
}
/**
* checks to see if the date falls inisde the list of cron expresions.
*
* @param cronList the list to crons to see if the curDate falls inside. If empty or null then it returns true
* @param curDate the date to check against. If null then it retuns true.
* @return true if its good, will never return false as it throws error
*/
static > boolean checkWindows(List cronList, T curDate){
cronList?.each { String cronString ->
long secondsToNextRun = secondsToNextRun(cronString, curDate)
//string should be like "* * 14,15 * * MON-FRI", so it runs every seconds.
// if we are at 1 second then we know we are in the window
if (secondsToNextRun <= 1) {
//throw problem
// XXX add header for the retry-after.
throw new ProblemResult().title("System Maintenance. No Jobs Can be Run. See Retry-After Header.").status(503).toException()
}
}
return true
}
static > long secondsToNextRun(String cronString, T curDate){
//Every second and minute should have * in those fields as we are only looking at hours
var expression = CronExpression.parse(cronString)
Temporal nextRun = expression.next(curDate)
long secDif = ChronoUnit.SECONDS.between(curDate, nextRun);
return secDif
}
/** Uses timezone in MaintenanceProps to get the current time */
static LocalDateTime currentTime(ZoneId zoneId){
LocalDateTime timeToUse = zoneId ? LocalDateTime.now(zoneId) : LocalDateTime.now()
return timeToUse
}
}
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