Jenkins slave disconnect via pipeline script from scm

Martins Gulbis

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Mar 3, 2017, 2:00:56 AM3/3/17

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Hi,

I'm struggling with jenkins slave disconnect from pipeline stage which is being executed on master. After a bit of googling I got following solution which works when executed as "Pipeline script"

import hudson.model.Slave.*
import hudson.slaves.OfflineCause.SimpleOfflineCause;

class OfflineMessage extends org.jvnet.localizer.Localizable {
	def message;
	OfflineMessage(String msg) {
		super(null, null, []);
		def time = new Date(); //.format("HH:mm MM/dd/yy z",TimeZone.getTimeZone("EST"))
		this.message = msg; //"Toggling the node offline:" + time
	}
	String toString() {
		this.message;
	}
	String toString(java.util.Locale l) {
		toString();
	}
}

def NodeDisconnect (NodeName) {
    def WorkNode = jenkins.model.Jenkins.instance.getNode(NodeName)
    if (WorkNode) {
        println ("GOT NODE")
        def WorkComputer = WorkNode.computer
        def WorkLouncher = WorkComputer.getLauncher();
        def WorkListener = TaskListener.NULL
        if (WorkComputer.isOnline()){
            println("Node is online")
            if (WorkComputer.isIdle()){
                println ("Current node status Online, Idle with ${WorkComputer.countExecutors()}:${WorkComputer.countBusy()} executors")
                println ("About to disconnect node")
                WorkLouncher.beforeDisconnect(WorkComputer,WorkListener)
                WorkComputer.disconnect(SimpleOfflineCause.create(new OfflineMessage("Disconnected for VirtualBox snapshot restore")));
                WorkLouncher.afterDisconnect(WorkComputer,WorkListener)
                println ("Wait for node to go offline")
                WorkComputer.waitUntilOffline()
            }
            else {
                println ("Current node status Online, Busy with ${WorkComputer.countExecutors()}:${WorkComputer.countBusy()} executors")
                //raise
            }
        }
        else {
            println("Node is offline with cause:${WorkComputer.getOfflineCauseReason()}")
            //raise
        }
    }
    else {
        println ("NODE NOT FOUND")
        //raise error 
    }
}

node('master') {
    stage('Stage1'){
        NodeDisconnect('Node1')
        sleep 3
        NodeConnect('Node1')
        sleep 3
    }
}
node('Node1'){
    stage('Stage2'){
        echo "HI FROM NODE"
    }
}

But when I try to execute it as "Pipeline script from SCM" it fails with

...
org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: unclassified staticMethod hudson.slaves.OfflineCause$SimpleOfflineCause create OfflineMessage
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onStaticCall(SandboxInterceptor.java:138)
	at org.kohsuke.groovy.sandbox.impl.Checker$2.call(Checker.java:180)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedStaticCall(Checker.java:177)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:91)
	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:16)
	at Script2.NodeDisconnect(Script2.groovy:42)
	at WorkflowScript.run(WorkflowScript:10)
	at ___cps.transform___(Native Method)
	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:57)
	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:109)
	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:82)
	at sun.reflect.GeneratedMethodAccessor702.invoke(Unknown Source)
...

Can somebody give a hint or example on how to rewrite OfflineMessage class to get a round exception which is being rised by GroovyCallSiteSelector.staticMethod(receiver, method, args);

PS. I'm new to Jenkins, Groovy and java so please keep answers as simple as possible ...

Martins Gulbis

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Mar 3, 2017, 2:03:00 AM3/3/17

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Resources which I used

http://javadoc.jenkins-ci.org/hudson/model/Computer.html#disconnect(hudson.slaves.OfflineCause)

http://javadoc.jenkins-ci.org/hudson/slaves/OfflineCause.html#create(org.jvnet.localizer.Localizable)

https://github.com/jenkinsci/script-security-plugin/blob/master/src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/SandboxInterceptor.java

Martins Gulbis

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Mar 3, 2017, 5:17:09 AM3/3/17

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For those who stumble upon this problem I got around it by using OfflineCause.UserCause instad of OfflineCause.SimpleOfflineCause. For me it looks like this

def NodeDisconnect (NodeName) {
    println("Node Disconnect")

    def WorkNode = jenkins.model.Jenkins.instance.getNode(NodeName)
    if (WorkNode) {
        println ("GOT NODE")
        def WorkComputer = WorkNode.computer
        def WorkLouncher = WorkComputer.getLauncher();
        def WorkListener = TaskListener.NULL
        if (WorkComputer.isOnline()){
            println("Node is online")
            if (WorkComputer.isIdle()){
                println ("Current node status Online, Idle with ${WorkComputer.countExecutors()}:${WorkComputer.countBusy()} executors")
                println ("About to disconnect node")

                def WorkOfflineCause = new OfflineCause.UserCause(User.current(),'Disconnected for VirtualBox snapshot restore...')
                WorkLouncher.beforeDisconnect(WorkComputer,WorkListener)
                WorkComputer.disconnect(WorkOfflineCause);

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