Idle hours for jenkins ec2 fleet plugin

ec2fleet.groovy

import com.amazon.jenkins.ec2fleet.EC2FleetCloud

def changeFleetWorkers(name, minSize, maxSize, idleMins) {
	Jenkins jenkins = Jenkins.getInstance()

	println "Changing worker ${name} to minSize: ${minSize}, maxSize: ${maxSize}, idleMins: ${idleMins}"

	oldCloud = jenkins.getCloud(name)

	oldMinSize = oldCloud.getMinSize()
	oldMaxSize = oldCloud.getMaxSize()
	oldIdleMins = oldCloud.getIdleMinutes()

	println "Old settings: oldMinSize: ${oldMinSize}, oldMaxSize: ${oldMaxSize}, oldIdleMins: ${oldIdleMins}"

	if (oldMinSize == minSize && oldMaxSize == maxSize && oldIdleMins == idleMins) {
		println "Exitting because all settings are equal"		
	}

	// find detailed information about parameters on plugin config page or
	// https://github.com/jenkinsci/ec2-fleet-plugin/blob/master/src/main/java/com/amazon/jenkins/ec2fleet/EC2FleetCloud.java
	EC2FleetCloud ec2FleetCloud = new EC2FleetCloud(
		name, // fleetCloudName 
		oldCloud.getOldId(),
		oldCloud.getAwsCredentialsId(),
		"",
		oldCloud.getRegion(),
		oldCloud.getEndpoint(),
		oldCloud.getFleet(),
		oldCloud.getLabelString(), // labels
		oldCloud.getFsRoot(), // fs root
		oldCloud.getComputerConnector(),
		oldCloud.isPrivateIpUsed(), // if need to use privateIpUsed
		oldCloud.isAlwaysReconnect(), // if need alwaysReconnect
		idleMins, // if need to allow downscale set > 0 in min
		minSize, // minSize
		maxSize, // maxSize
		oldCloud.getNumExecutors(), // numExecutors
		oldCloud.isAddNodeOnlyIfRunning(), // addNodeOnlyIfRunning
		oldCloud.isRestrictUsage(), // restrictUsage allow execute only jobs with proper label
		oldCloud.isDisableTaskResubmit(), //disableTaskResubmit
		oldCloud.getInitOnlineTimeoutSec(), //initOnlineTimeoutSec
		oldCloud.getInitOnlineCheckIntervalSec(), //initOnlineCheckIntervalSec
		oldCloud.isScaleExecutorsByWeight(), //scaleExecutorsByWeight
		oldCloud.getCloudStatusIntervalSec(), //cloudStatusIntervalSec
		oldCloud.isNoDelayProvision() //noDelayProvision
	)

	jenkins.clouds.remove(oldCloud)

	// add cloud configuration to Jenkins
	jenkins.clouds.add(ec2FleetCloud)

	// save current Jenkins state to disk
	jenkins.save()

	println "Done"
}

def scaleByTime(name, busyStartHour, busyEndHour, busyMinSize, busyMaxSize, busyIdleTime, lazyMinSize, lazyMaxSize, lazyIdleTime) {
	Calendar date = Calendar.getInstance();
	def hour = date.get(Calendar.HOUR_OF_DAY);
	def dayOfWeek = date.get(Calendar.DAY_OF_WEEK);
	def isWeekend = false

	println "Processing ${name}"

	if (dayOfWeek == Calendar.SUNDAY || dayOfWeek == Calendar.SATURDAY) {
		isWeekend = true;
	}

	if (!isWeekend && hour >= busyStartHour && hour <= busyEndHour) {
		println "Applying busy settings"
		changeFleetWorkers(name, busyMinSize, busyMaxSize, busyIdleTime)
	} else {
		println "Applying lazy settings"
		changeFleetWorkers(name, lazyMinSize, lazyMaxSize, lazyIdleTime)
	}
}

return this

Jenkinsfile

pipeline {
	agent {
		label 'jenkins-worker-light'
	}
    triggers {
        cron(env.BRANCH_NAME == 'master' ? '*/15 * * * *' : '')
    }
	options {
		timeout(time: 60, unit: 'SECONDS', activity: false)
	}
	stages {
		stage('run') {
			steps {
				script {
					ec2fleet = load "scale-workers/ec2fleet.groovy"

					busyStartHour = 9
					busyEndHour = 19

					ec2fleet.scaleByTime(
						"jenkins-fleet-light", //name
						busyStartHour, // busyStartHour
						busyEndHour, // busyEndHour

						1, // busyMinSize
						1, // busyMaxSize
						60, // busyIdleTine

						0, // lazyMinSize
						1, // lazyMaxSize
						30 // lazyIdleTine
					)
				}
			}
		}
	}
}