Create JSON file from Groovy variables in Pipeline - jenkins job - json

Question

i am new to jenkins, i have a pipline job with parameters.
I want to create a JSON file and write my parameters there.
(and then let my jar file read that JSON file and run according to it)
how can i do this in groovy?
this is my jenkins file:
pipeline {
agent {
label "create_pass_criteria"
}
parameters {
string(name: 'IP', description: 'Please enter your ip')
password(name: 'PASSWORD',description: 'Please enter your mx password')
string(name: 'NAME', description: 'Please enter the name ')
}
tools {
maven 'maven-3.3.9'
}
options
{
buildDiscarder(logRotator(artifactDaysToKeepStr: '', artifactNumToKeepStr: '', daysToKeepStr: '', numToKeepStr: '20'))
gitLabConnection('gitlab')
}
stages {
stage('Git Clone') {
steps {
updateGitlabCommitStatus name: 'Build', state: 'running'
checkout([
$class : 'GitSCM',
branches : [[name: '*/master']],
doGenerateSubmoduleConfigurations: false,
extensions : [],
submoduleCfg : [],
userRemoteConfigs : [[credentialsId: GIT_CRED, url: GIT_PATH]]
])
}
}
stage('Build') {
steps {
sh 'mvn install'
}
}
stage('run') {
steps {
sh 'java -jar /var/lib/jenkins/workspace/create_pass_criteria/target/create_pass_criteria-8.0.125-SNAPSHOT.jar'
}
}
}
post {
success {
updateGitlabCommitStatus name: 'Build', state: 'success'
emailext(
to: EMAIL_ADDR,
subject: "Success Pipeline: ${currentBuild.fullDisplayName}",
body: "Pipeline URL: ${env.BUILD_URL}",
mimeType: 'text/html'
)
}
failure {
updateGitlabCommitStatus name: 'Build', state: 'failed'
emailext(
to: EMAIL_ADDR,
subject: "Failed Pipeline: ${currentBuild.fullDisplayName}",
body: "Pipeline URL: ${env.BUILD_URL}",
mimeType: 'text/html'
)
}
}
} // pipeline
i don't know if it is correct but this is what i need to add to my Jenkins file?:
node{
//to create json declare a sequence of maps/arrays in groovy
//here is the data according to your sample
def data = [
attachments:[
[
mxIp : params.MX_IP,
mxPassword : params.MX_PASSWORD,
policyName : params.POLICY_NAME,
]
]
]
writeJSON(file: 'parameters.json', json: data)
}
if yes, at which part does it is has to be?

Answer 1

You could put this code in a script block like this:
stage('run') {
steps {
script {
def data = [
attachments:[
[
mxIp : params.MX_IP,
mxPassword : params.MX_PASSWORD,
policyName : params.POLICY_NAME,
]
]
]
writeJSON(file: 'parameters.json', json: data)
}
sh 'java -jar /var/lib/jenkins/workspace/create_pass_criteria/target/create_pass_criteria-8.0.125-SNAPSHOT.jar'
}
}
In complex pipelines I try to create clean code by adhering to the single level of abstraction principle. In this case I would extract the script and sh steps into a separate function, which could then be called from the pipeline section as a single step:
stage('run') {
steps {
createPassCriteria()
}
}
Define the function after the closing } of the pipeline section:
void createPassCriteria() {
def data = [
attachments:[
[
mxIp : params.MX_IP,
mxPassword : params.MX_PASSWORD,
policyName : params.POLICY_NAME,
]
]
]
writeJSON(file: 'parameters.json', json: data)
sh 'java -jar /var/lib/jenkins/workspace/create_pass_criteria/target/create_pass_criteria-8.0.125-SNAPSHOT.jar'
}