Jenkinsfile

def project = 'general-218816'
def  appName = 'flask'
def  feSvcName = "flask-backend"
def  imageTag = "gcr.io/${project}/${appName}:${env.BRANCH_NAME}.${env.BUILD_NUMBER}"

pipeline {
    triggers {
        pollSCM('* * * * *')
    }
  agent {
    kubernetes {
      label 'sample-app'
      defaultContainer 'jnlp'
      yaml """
apiVersion: v1
kind: Pod
metadata:
labels:
  component: ci
spec:
  # Use service account that can deploy to all namespaces
  serviceAccountName: cd-jenkins
  containers:
  - name: python
    image: python:3
    command:
    - cat
    tty: true
  - name: gcloud
    image: gcr.io/cloud-builders/gcloud
    command:
    - cat
    tty: true
  - name: kubectl
    image: gcr.io/cloud-builders/kubectl
    command:
    - cat
    tty: true
"""
}
  }
  stages {
    stage('Test') {
      steps {
        container('python') {
          sh """
          echo hi test
          """
        }
      }
    }
    stage('Build and push image with Container Builder') {
      steps {
        container('gcloud') {
          sh "PYTHONUNBUFFERED=1 gcloud builds submit -t ${imageTag} ."
        }
      }
    }
    stage('Deploy Canary') {
      // Canary branch
      when { branch 'canary' }
      steps {
        container('kubectl') {
          // Change deployed image in canary to the one we just built
          sh("sed -i.bak 's#gcr.io/general-218816/flask:master.444#${imageTag}#' ./k8s/canary/*.yaml")
          sh("kubectl --namespace=production apply -f k8s/services/")
          sh("kubectl --namespace=production apply -f k8s/canary/")
          sh("echo http://`kubectl --namespace=production get service/${feSvcName} -o jsonpath='{.status.loadBalancer.ingress[0].ip}'` > ${feSvcName}")
        } 
      }
    }
    stage('Deploy Production') {
      // Production branch
      when { branch 'master' }
      steps{
        container('kubectl') {
        // Change deployed image in canary to the one we just built
          sh("sed -i.bak 's#gcr.io/general-218816/flask:master.444#${imageTag}#' ./k8s/production/*.yaml")
          sh("kubectl --namespace=production apply -f k8s/services/")
          sh("kubectl --namespace=production apply -f k8s/production/")
          sh("echo http://`kubectl --namespace=production get service/${feSvcName} -o jsonpath='{.status.loadBalancer.ingress[0].ip}'` > ${feSvcName}")
        }
      }
    }
    stage('Deploy Dev') {
      // Developer Branches
      when { 
        not { branch 'master' } 
        not { branch 'canary' }
      } 
      steps {
        container('kubectl') {
          // Create namespace if it doesn't exist
          sh("kubectl get ns ${env.BRANCH_NAME} || kubectl create ns ${env.BRANCH_NAME}")
          // Don't use public load balancing for development branches
          sh("sed -i.bak 's#LoadBalancer#ClusterIP#' ./k8s/services/backend.yaml")
          sh("sed -i.bak 's#gcr.io/general-218816/flask:master.444#${imageTag}#' ./k8s/dev/*.yaml")
          sh("kubectl --namespace=${env.BRANCH_NAME} apply -f k8s/services/")
          sh("kubectl --namespace=${env.BRANCH_NAME} apply -f k8s/dev/")
          echo 'To access your environment run `kubectl proxy`'
          echo "Then access your service via http://localhost:8001/api/v1/proxy/namespaces/${env.BRANCH_NAME}/services/${feSvcName}:80/"
        }
      }     
    }
  }
}