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Groovy Script: How to iterate through Jenkins Masters from JOC?

Daniel Ritchie

March 02, 2019 20:42

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I am looking to generate a report based on jobs on all masters.

For example, if I execute script on the MASTER I can get all jobs I'm looking for with something like:
    `jenkins.instance.getAllItems(Job.class)`

From the JOC, I can get high-level info on each master with something like: 
`Jenkins.instance.getAllItems(ConnectedMaster.class)`

However...I can't seem to figure out how to iterate through items on each master when issuing scripts on the JOC.  What I'm hoping for is something like an object hierarchy that I can drill down into such as:

`for Jenkins.instance.getAllItems(ConnectedMaster.class).each {
    it.getAllItems(Job.class)
}`

At one point I managed to find a single example that showed a way to accomplish this, but I can't find it.  The JOC script had what seemed to be a fairly complicated way of running script on each master from the JOC. 

Is that my only option?  Are there other ways to accomplish this?

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6 comments

• 0
  
  Daniel Ritchie March 02, 2019 20:57

  Here's the related script that I found.  Do I need to "execute remote script on master" from the JOC to accomplish this?  I'm hoping there might be a more direct way.

   

  https://github.com/cloudbees/jenkins-scripts/blob/master/print-masters-plugins.groovy#L28

   

   

• 0
  
  Denys Digtiar March 04, 2019 00:22

  You can create a Cluster Operation project which allows sending Groovy scripts to execute on connected Masters of your choice. 

  https://go.cloudbees.com/docs/cloudbees-documentation/cjoc-user-guide/index.html#_cluster_operations

• 0
  
  Daniel Ritchie March 04, 2019 07:17

  That's a great idea Denys.  Will be good for a few other things we are trying to accomplish as well.
  
  I can see that Cluster Operations is able to run a single script in parallel across multiple masters, but is there a way to consolidate the output?

  My original thinking was that I could have a single map/array/etc. and I could loop each master and update the counts.  Then, I would end up with one single output (which is a report from all of the masters) instead of duplicated info from each master that I then have to concatenate somehow.
  
  Helpful either way, thanks!

• 0
  
  Daniel Ritchie March 04, 2019 18:56

  It doesn't look like a Cluster Operation will work for this. 
  
  It seems like the Cluster Operations script run as an isolate script on each master; I can't see any way to report back to the Operations Center, and even if I could (say as output) that doesn't allow me to write another script to concatenate/interpret all of the results.
  
  Is there an equivalent to http://<JOC URL>/script that I can setup as a job that runs groovy script within the context of the JOC?

• 0
  
  Daniel Ritchie March 05, 2019 19:34

  Updating as an FYI for anyone else who comes across this.
  
  So far I think the only possible solution is to navigate to JOC/script and run groovy which executes code on each master, like this:
  https://github.com/cloudbees/jenkins-scripts/blob/master/print-masters-plugins.groovy#L30
  
  From there I can create a return object that can handle the response within the JOC's script, where I can aggregate results from all of the masters.
  
  

• 0
  
  Denys Digtiar March 07, 2019 07:09

  The Jenkins CLI has a script subcommand and there is an HTTP endpoint as well. Therefore, it should be possible to create a Freestyle job that executes the script whenever necessary.

  https://wiki.jenkins.io/display/JENKINS/Jenkins+Script+Console