submit-social-housing-lettings-and-sales-data/.github/workflows/review_teardown_pipeline.yml

name: Review app teardown pipeline

concurrency:
  group: deploy-review${{ github.event.pull_request.number || inputs.pr_number }}

on:
  pull_request:
    types:
      - closed
  workflow_dispatch:
    inputs:
      pr_number:
        required: true
        type: string
        description: "The PR number of the review app to tear down. Note: this is NOT the ticket number"

permissions: {}

env:
  app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
  aws_account_id: 837698168072
  aws_region: eu-west-2
  aws_role_prefix: core-dev

jobs:
  get_pr_number:
    name: Get PR number
    runs-on: ubuntu-latest
    outputs:
      pr_number: ${{ steps.get.outputs.pr_number }}
    steps:
      - name: Get PR number
        id: get
        run: |
          if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
            echo "pr_number=${{ inputs.pr_number }}" >> $GITHUB_OUTPUT
          else
            echo "pr_number=${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
          fi          

  check_review_app_exists:
    name: Check if review app exists
    needs: [get_pr_number]
    runs-on: ubuntu-latest
    permissions:
      id-token: write
    outputs:
      exists: ${{ steps.check.outputs.exists }}
    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: ${{ env.app_repo_role }}

      - name: Configure AWS credentials for review environment
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: arn:aws:iam::${{ env.aws_account_id }}:role/${{ env.aws_role_prefix }}-deployment
          role-chaining: true

      - name: Check if ECS service exists
        id: check
        env:
          aws_task_prefix: core-review-${{ needs.get_pr_number.outputs.pr_number }}
        run: |
          if aws ecs describe-services --cluster ${{ env.aws_task_prefix }}-app --services ${{ env.aws_task_prefix }}-app --query "services[?status=='ACTIVE']" | grep -q 'serviceName'; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi          

  database:
    name: Drop database
    if: needs.check_review_app_exists.outputs.exists == 'true'
    needs: [get_pr_number, check_review_app_exists]
    runs-on: ubuntu-latest
    permissions:
      id-token: write
    env:
      aws_task_prefix: core-review-${{ needs.get_pr_number.outputs.pr_number }}

    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: ${{ env.app_repo_role }}

      - name: Configure AWS credentials for review environment
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: arn:aws:iam::${{ env.aws_account_id }}:role/${{ env.aws_role_prefix }}-deployment
          role-chaining: true

      - name: Drop Database
        env:
          ad_hoc_task_definition: ${{ env.aws_task_prefix }}-ad-hoc
          cluster: ${{ env.aws_task_prefix }}-app
          service: ${{ env.aws_task_prefix }}-app
        run: |
          network=$(aws ecs describe-services --cluster $cluster --services $service --query services[0].networkConfiguration)
          overrides='{ "containerOverrides" : [{ "name" : "app", "command" : ["bundle", "exec", "rake", "db:drop"]}]}'
          arn=$(aws ecs run-task --cluster $cluster --task-definition $ad_hoc_task_definition --network-configuration "$network" --overrides "$overrides" --group migrations --launch-type FARGATE --query tasks[0].taskArn)
          echo "Waiting for db drop task to complete"
          temp=${arn##*/}
          id=${temp%*\"}
          aws ecs wait tasks-stopped --cluster $cluster --tasks $id
          succeeded=$(aws ecs describe-tasks --cluster $cluster --tasks $id --query "tasks[0].stopCode == 'EssentialContainerExited' && to_string(tasks[0].containers[0].exitCode) == '0'")
          if [ $succeeded == true ]; then exit 0; else exit 1; fi          

  infra:
    name: Teardown review app
    if: needs.check_review_app_exists.outputs.exists == 'true'
    needs: [get_pr_number, check_review_app_exists, database]
    uses: communitiesuk/submit-social-housing-lettings-and-sales-data-infrastructure/.github/workflows/destroy_review_app_infra.yml@main
    with:
      key: ${{ needs.get_pr_number.outputs.pr_number }}
      app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
    permissions:
      id-token: write