Json and dynamic variables

[Niksan]

I have a job which has a groovy script and inside there I have a JSON like array which I parse, I'd like to offload this array to a JSON file on disk but it contains some elements that are gathered from parameters for the job.

What's the best way of injecting / replacing tokens in a JSON file that was loaded up in to a groovy script, are there any helpers already in Jenkins land to assist with this or would it be a case of traversing the whole array and manually replacing tokens with variables?

[Ioannis Moutsatsos]

I have been experimenting with the groovy JsonBuilder[1] and I find it quite capable in generating dynamic JSON. I'm not aware of any Jenkins plugin for what you are looking for though.

[1] http://docs.groovy-lang.org/latest/html/gapi/groovy/json/JsonBuilder.html

Cheers

Ioannis

[Niksan]

Thanks for that, I'm only interested in reading though, I came up with a solution although I'm rusty with Groovy but it will make do until a better approach appears.

This method enables me to write test json in the console for test purposes.

def token1 = 'Replaced-Token1'
def token2 = 'Replaced-Token2'

def tokenMapper = [
  '${token1}' : token1,
  '${token2}' : token2,
]

def jsonFile = new File('d:\\test.json').text
def json = new JsonSlurper().parseText(jsonFile)

json = json*.collectAll{
  element ->
  if(element instanceof String) {
    if(element.startsWith('${')) {
      element = tokenMapper[element] ?: element
    }
  }
  element
}

println(json)
 

[Ioannis Moutsatsos]

I see. In that case the 'groovy' way to do this is the SimpleTemplateEngine [1]

http://docs.groovy-lang.org/latest/html/api/groovy/text/SimpleTemplateEngine.html

Hope it helps!

Ioannis

[Niksan]

Ah great, exactly what I was looking for, I also realised I'd also be better parsing the string before parsing the JSON, rather than the other way round,  simplifies it a lot. :)

Thanks again.