Taskfile.yaml

# https://taskfile.dev

version: "3"

vars:
  TFVARS_FILE: .local.tfvars
  # The default namespace where application gets deployed
  APP_NAMESPACE: demo-apps
  # https://en.wikipedia.org/wiki/IETF_language_tag
  LANG: ta

dotenv:
  - .env

tasks:
  default:
    desc: Creates GKE cluster and Deploys the lingua-greeter application
    cmds:
      - task: create_cluster
      - task: deploy_app
    silent: true
  
  clean:
    desc: Clean all terraform artifacts/assets
    silent: true
    cmds:
      - rm -rf .terraform .terraform.lock.hcl
  
  format:
    desc: Format terraform files
    silent: true
    cmds:
      - terraform fmt --recursive {{.ROOT_DIR}} {{.CLI_ARGS}}
  
  init:
    desc: Init terraform working directory
    silent: true
    cmds:
      - mkdir -p {{.ROOT_DIR}}/.kube
      - terraform init {{.CLI_ARGS}}

  validate:
    silent: true
    deps:
      - format
    desc: Validate the terraform resources
    cmds:
      - terraform validate {{.CLI_ARGS}}
  
  create_cluster:
    silent: true
    deps:
      - validate
    desc: Create the GKE cluster
    cmds:
     - terraform apply -var app_use_workload_identity=false -var-file={{.TFVARS_FILE}} {{.CLI_ARGS}}
  
  deploy_app:
    silent: true
    aliases:
      - "deploy"
    desc: Deploy the application without workload identity 
    sources:
      - app/config/*.yaml
    status:
     - | 
      kubectl rollout status -n demo-apps deployment/lingua-greeter --timeout=60s | grep -q 'deployment "lingua-greeter" successfully rolled out'
    cmds:
     - kubectl get ns --no-headers | grep -q  {{.APP_NAMESPACE}} || kubectl create ns {{.APP_NAMESPACE}}
     - kubectl apply -n {{.APP_NAMESPACE}} -k $DEMO_HOME/app/config
     - kubectl rollout status -n {{.APP_NAMESPACE}} deployment/lingua-greeter --timeout=60s
     - while [ -z $(kubectl get svc -n {{.APP_NAMESPACE}} lingua-greeter -ojsonpath="{.status.loadBalancer.ingress[*].ip}") ]; do sleep .3; done;
  
  use_workload_identity:
    silent: true
    deps:
      - validate
      - deploy_app
    desc: Make application use Workload Identity
    sources:
      - rbac.tf
    generates:
      - k8s/sa.yaml
    status:
      - |
        grep -q 'iam.gke.io/gcp-service-account: "translator@{{.GOOGLE_PROJECT_ID}}.iam.gserviceaccount.com"' k8s/sa.yaml
    cmds:
     - terraform apply -var-file={{.TFVARS_FILE}} -var app_use_workload_identity=true {{.CLI_ARGS}}
     - kubectl apply -n {{.APP_NAMESPACE}} -f k8s/sa.yaml
    vars:
      GOOGLE_PROJECT_ID:
        sh: terraform output -raw project_id
  
  show_service_ip:
    desc: Display the lingua-greeter service's LoadBalancer IP 
    silent: true
    deps:
      - deploy_app
    cmds:
      - |
        echo "Service IP: {{.SERVICE_IP}}"
        echo "Application URL: http://{{.SERVICE_IP}}"
    vars:
      SERVICE_IP:
        sh: kubectl get svc -n {{.APP_NAMESPACE}} lingua-greeter -ojsonpath="{.status.loadBalancer.ingress[*].ip}"

  call_service:
    desc: Calls the lingua-greeter service
    silent: true
    cmds:
      - curl -s "http://{{.SERVICE_IP}}/{{.LANG}}"
    vars:
      SERVICE_IP:
        sh: kubectl get svc -n demo-apps lingua-greeter -ojsonpath="{.status.loadBalancer.ingress[*].ip}"

  app_logs:
    desc: Shows the application logs
    silent: true
    cmds:
      - kubectl logs  -n {{.APP_NAMESPACE}} -lapp=lingua-greeter

  restart_app:
    desc: Restarts the kubernetes deployment
    silent: true
    cmds:
      - kubectl rollout restart -n {{.APP_NAMESPACE}} deployment/lingua-greeter
      - kubectl rollout status -n {{.APP_NAMESPACE}} deployment/lingua-greeter --timeout=60s

  destroy:
    silent: true
    desc: Destroys terraform resources
    cmds:
      - terraform destroy -var-file={{.TFVARS_FILE}} {{.CLI_ARGS}}
  
  readme:
    desc: Build the README.md
    silent: true
    cmds:
     - terraform-docs {{.ROOT_DIR}} > {{.ROOT_DIR}}/README.md