Jenkinsfile

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                echo 'Running build automation'
                sh './gradlew build --no-daemon'
                archiveArtifacts artifacts: 'dist/trainSchedule.zip'
            }
        }
    /*Run the stage*/
    stage('DeployToStaging') {
        /*only run on only master branch, only when this condition meet, it will run this stage*/
            when {
                branch 'master'
            }
        /*will access the webserver that i created in the Jenkins*/
            steps {
                /*give me access to a secure way that created in the Jenkins*/
                withCredentials([usernamePassword(credentialsId: 'webserver_login', usernameVariable: 'USERNAME', passwordVariable: 'USERPASS')]) {
                    /*using the pulish ssh plugin to move the file over ssh on the webserver*/
                    sshPublisher(
                        /*make the ssh plugin more restrict*/
                        failOnError: true,
                        continueOnError: false,
                        publishers: [
                            sshPublisherDesc(
                             /*name of plugin configuration,name the pulish ssh server as staging. this use to by jenkins to identify which server will publish to*/ 
                                configName: 'staging',
                                sshCredentials: [
                                    username: "$USERNAME",
                                    encryptedPassphrase: "$USERPASS"
                                ], 
                                transfers: [
                                    sshTransfer(
                                        sourceFiles: 'dist/trainSchedule.zip',
                                        removePrefix: 'dist/',
                                        remoteDirectory: '/tmp',
                                        execCommand: 'sudo /usr/bin/systemctl stop train-schedule && rm -rf /opt/train-schedule/* && unzip /tmp/trainSchedule.zip -d /opt/train-schedule && sudo /usr/bin/systemctl start train-schedule'
                                    )
                                ]
                            )
                        ]
                    )
                }
            }
        }
        stage('DeployToProduction') {
            when {
                branch 'master'
            }
            steps {
                /*ask for user input*/
                input 'Does the staging environment look OK?'
                /*deal with different type of risk condition that can result from this pause for input. it use to prevent any early build, prevent me to build an older version over a new version code*/ 
                milestone(1)
                withCredentials([usernamePassword(credentialsId: 'webserver_login', usernameVariable: 'USERNAME', passwordVariable: 'USERPASS')]) {
                    sshPublisher(
                        failOnError: true,
                        continueOnError: false,
                        publishers: [
                            sshPublisherDesc(
                                configName: 'production',
                                sshCredentials: [
                                    username: "$USERNAME",
                                    encryptedPassphrase: "$USERPASS"
                                ], 
                                transfers: [
                                    sshTransfer(
                                        sourceFiles: 'dist/trainSchedule.zip',
                                        removePrefix: 'dist/',
                                        remoteDirectory: '/tmp',
                                        execCommand: 'sudo /usr/bin/systemctl stop train-schedule && rm -rf /opt/train-schedule/* && unzip /tmp/trainSchedule.zip -d /opt/train-schedule && sudo /usr/bin/systemctl start train-schedule'
                                    )
                                ]
                            )
                        ]
                    )
                }
            }
        }
    }
}