Jenkinsfile

pipeline {
    agent any
    environment {
        DOCKER_IMAGE_NAME = "purwar/my-app-hello"
    }
    
    stages {
        stage('Build') {
            steps {
                echo 'Running build automation'
                sh 'cat hello_world.py'
            }
        }
        stage('Build Docker Image') {
            when {
                branch 'main'
            }
            steps {
                script {
                    app = docker.build(DOCKER_IMAGE_NAME)
                    app.inside {
                        sh 'echo $(curl localhost:8080)'
                    }
                }
            }
        }
        stage('Push Docker Image') {
            when {
                branch 'main'
            }
            steps {
                script {
                    docker.withRegistry('https://registry.hub.docker.com', 'docker_hub_login') {
                        app.push("${env.BUILD_NUMBER}")
                        app.push("latest")
                    }
                }
            }
        }
      
        stage('CanaryDeploy') {
            when {
                branch 'main'
            }
            environment { 
                CANARY_REPLICAS = 1
            }
            steps {
                kubernetesDeploy(
                    kubeconfigId: 'kubeconfig',
                    configs: 'hello-app-kube-canary.yml',
                    enableConfigSubstitution: true
                )
            }
        }        
        
        stage('DeployToProduction') {
            when {
                branch 'main'
            }
            environment { 
                CANARY_REPLICAS = 0
            }
            steps {
                input 'Deploy to Production?'
                milestone(1)
                kubernetesDeploy(
                    kubeconfigId: 'kubeconfig',
                    configs: 'hello-app-kube.yml',
                    enableConfigSubstitution: true
                )
            }
        }
      
    }
}