引言

在创建 Jenkins Job，需要设置一些参数，有时想偷懒，在手动触发 Build 时不想输入太多参数，如果一些参数能互相关联就好了。这款 Active Choices Reactive Parameters 类型参数可以实现。

内容提要：

1. 安装 Active Choices Plugin
2. UI 应用 Active Choices Reactive Parameters
3. Pipeline 脚本应用

安装 Active Choices Plugin

在用 Active Choices Reactive Parameters 之前，确保 Jenkins 上安装 Active Choices 插件。
Manage Jenkins -> pluginManager

安装成功后，打开 Job Configure 页面，勾上 This project is parameterized , 点开 Add Parameter，会看到多出下面三个选项。

应用 Active Choices Reactive Parameters

达成的效果如下：根据 Env 和 Project_Name 的数据动态生成 Smoke_Job_Name

首先添加 Env 和 Project_Name 参数：选择 Extensible Choice 参数类型
注意不要勾选 Editable，本人试过，动态参数不会动态生成。


添加动态关联参数：选择 Active Choices Reactive Parameters 参数类型，具体介绍请参考官网 Active Choice

Fallback Script， 是当脚本运行失败或抛异常的处理。

Groovy 脚本：

if(Project_Name.equals("A") && Env.equals("Dev")){
return ["Dev/API-Test/A_Dev_Smoke"]
}else if(Project_Name.equals("A") && Env.equals("Prod")){
return ["Dev/API-Test/A_Prod_Smoke"]
}else if(Project_Name.equals("B") && Env.equals("Dev")){
return ["Dev/API-Test/B_Dev_Smoke"]
}else if(Project_Name.equals("B") && Env.equals("Prod")){
return ["Dev/API-Test/B_Prod_Smoke"]
}else{
return ["Not Ready"]
}

如果 Choice Type 选择 Multi Select，Groovy 脚本中也可以返回多个 Item, 例如：
return [“item 1”, “item 2”]

Pipeline 脚本应用

先看一下达成的效果：根据 Env 参数，动态绑定 Server 参数

Pipeline Groovy 脚本：
注意： sandbox: true

properties([
    parameters([
        [$class: "ChoiceParameter", 
            choiceType: "PT_SINGLE_SELECT", 
            description: "Select the Env Name from the Dropdown List", 
            filterLength: 1, 
            filterable: false, 
            name: "Env", 
            randomName: "choice-parameter-5631314439613978", 
            script: [
                $class: "GroovyScript", 
                fallbackScript: [
                    classpath: [], 
                    sandbox: true, 
                    script: 
                        '''return["Could not get Env"]'''
                ], 
                script: [
                    classpath: [], 
                    sandbox: true, 
                    script: 
                       '''return["Dev","QA","Stage","Prod"]'''
                ]
            ]
        ], 
        [$class: "CascadeChoiceParameter", 
            choiceType: "PT_SINGLE_SELECT", 
            description: "Select the Server from the Dropdown List", 
            filterLength: 1, 
            filterable: false, 
            name: "Server", 
            randomName: "choice-parameter-5631314456178619", 
            referencedParameters: "Env", 
            script: [
                $class: "GroovyScript", 
                fallbackScript: [
                    classpath: [], 
                    sandbox: true, 
                    script: 
                        '''return["Could not get Environment from Env Param"]'''
                ], 
                script: [
                    classpath: [], 
                    sandbox: true, 
                    script: 
                        ''' if (Env.equals("Dev")){
                                return["devaaa001","devaaa002","devbbb001","devbbb002","devccc001","devccc002"]
                            }
                            else if(Env.equals("QA")){
                                return["qaaaa001","qabbb002","qaccc003"]
                            }
                            else if(Env.equals("Stage")){
                                return["staaa001","stbbb002","stccc003"]
                            }
                            else if(Env.equals("Prod")){
                                return["praaa001","prbbb002","prccc003"]
                            }
                        '''
                ]
            ]
        ]
    ])
])

pipeline {
  environment {
         vari = ""
  }
  agent any
  stages {
      stage ("Example") {
        steps {
         script{
          echo 'Hello'
          echo "${params.Env}"
          echo "${params.Server}"
          if (params.Server.equals("Could not get Environment from Env Param")) {
              echo "Must be the first build after Pipeline deployment.  Aborting the build"
              currentBuild.result = 'ABORTED'
              return
          }
          echo "Crossed param validation"
        } }
      }
  }
}