I found the closure composition feature and it works well for the use case
that I had in mind. However, it would be interesting to understand why the
below fails. Should I create a bug?
On Monday, August 27, 2018 at 12:26:32 PM UTC+5:30, Hari Krishna Dara wrote:
>
> I am trying out an approach in which the caller receives a closure as a
> return value from a function so that the context can be preserved for
> further call chaining. I tried the below as a test and it didn't work:
>
> def prep() {
> return [run: {-> echo "Hello Closure"}]
> }
>
> pipeline {
> agent "any"
>
> stages {
> stage("Init") {
> steps {
> script {
> p = prep()
> p.run()
> }
> }
> }
> }
> }
>
>
> The error I see in the console log is:
>
> hudson.remoting.ProxyException: groovy.lang.MissingMethodException: No
> signature of method: java.util.LinkedHashMap.run() is applicable for argument
> types: () values: []
> Possible solutions: min(groovy.lang.Closure), put(java.lang.Object,
> java.lang.Object), put(java.lang.Object, java.lang.Object), find(), any(),
> grep()
> at
> org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:131)
> at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:155)
> at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:159)
> at
> com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
> at WorkflowScript.run(WorkflowScript:14)
> at ___cps.transform___(Native Method)
>
> ...
>
> When I tried to return the closure directly instead of a map it worked
> fine:
>
> def prep() {
> return {-> echo "Hello Closure"}
> ...
> p = prep()
> ...
>
>
> Also, if I extract the map element first, it works fine (when I called the
> local variable as run, I got the script security error: Scripts not
> permitted to use method java.lang.Runnable run):
>
> p = prep()
> r = p.run
> r()
>
> And this works too:
>
> p = prep()
> p["run"]()
>
>
> but this is not elegant. Is this a bug or expected behavior? The below
> equivalent worked fine in script console:
>
> def prep() {
> return [run: {-> print("Hello Closure")}]
> }
>
> prep().run()
>
>
>
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