reusable_deploy_v2_sar.yml

name: Deploy V2 SAR

# PROCESS
#
# 1. This workflow starts after the layer artifact is produced on `publish_v2_layer`
# 2. We use the same layer artifact to ensure the SAR app is consistent with the published Lambda Layer
# 3. We publish the SAR for both x86_64 and arm64 (see `matrix` section)
# 4. We use `sam package` and `sam publish` to publish the SAR app
# 5. We remove the previous Canary stack (if present) and deploy a new one to test the SAR App. We retain the Canary in the account for debugging purposes
# 6. Finally the published SAR app is made public on the PROD environment

# USAGE
#
# NOTE: meant to be used with ./.github/workflows/publish_v2_layer.yml
#
# sar-beta:
#   needs: build-layer
#   permissions:
#     # lower privilege propagated from parent workflow (release.yml)
#     id-token: write
#     contents: read
#     pull-requests: none
#     pages: none
#   uses: ./.github/workflows/reusable_deploy_v2_sar.yml
#   secrets: inherit
#   with:
#     stage: "BETA"
#     artefact-name: "cdk-layer-artefact"
#     environment: "layer-beta"
#     package-version: ${{ inputs.latest_published_version }}

permissions:
  id-token: write
  contents: read

env:
  NODE_VERSION: 16.12
  AWS_REGION: eu-west-1
  SAR_NAME: aws-lambda-powertools-python-layer
  TEST_STACK_NAME: serverlessrepo-v2-powertools-layer-test-stack

on:
  workflow_call:
    inputs:
      stage:
        description: "Deployment stage (BETA, PROD)"
        required: true
        type: string
      artefact-name:
        description: "CDK Layer Artefact name to download"
        required: true
        type: string
      package-version:
        description: "The version of the package to deploy"
        required: true
        type: string
      environment:
        description: "GitHub Environment to use for encrypted secrets"
        required: true
        type: string

jobs:
  deploy-sar-app:
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    strategy:
      matrix:
        architecture: ["x86_64", "arm64"]
    steps:
      - name: Checkout
        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9  # v3.5.3
      - name: AWS credentials
        uses: aws-actions/configure-aws-credentials@5fd3084fc36e372ff1fff382a39b10d03659f355 # v2.2.0
        with:
          aws-region: ${{ env.AWS_REGION }}
          role-to-assume: ${{ secrets.AWS_LAYERS_ROLE_ARN }}
      - name: AWS credentials SAR role
        uses: aws-actions/configure-aws-credentials@5fd3084fc36e372ff1fff382a39b10d03659f355 # v2.2.0
        id: aws-credentials-sar-role
        with:
          aws-access-key-id: ${{ env.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ env.AWS_SECRET_ACCESS_KEY }}
          aws-session-token: ${{ env.AWS_SESSION_TOKEN }}
          role-duration-seconds: 1200
          aws-region: ${{ env.AWS_REGION }}
          role-to-assume: ${{ secrets.AWS_SAR_V2_ROLE_ARN }}
      - name: Setup Node.js
        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
        with:
          node-version: ${{ env.NODE_VERSION }}
      - name: Download artifact
        uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
        with:
          name: ${{ inputs.artefact-name }}
      - name: Unzip artefact
        run: unzip cdk.out.zip
      - name: Configure SAR name
        run: |
          if [[ "${{ inputs.stage }}" == "BETA" ]]; then
            SAR_NAME="test-${SAR_NAME}"
          fi
          echo SAR_NAME="${SAR_NAME}" >> "$GITHUB_ENV"
      - name: Adds arm64 suffix to SAR name
        if: ${{ matrix.architecture == 'arm64' }}
        run: echo SAR_NAME="${SAR_NAME}-arm64" >> "$GITHUB_ENV"
      - name: Normalize semantic version
        id: semantic-version # v2.0.0a0 -> v2.0.0-a0
        env:
          VERSION: ${{ inputs.package-version }}
        run: |
          VERSION="${VERSION/a/-a}"
          echo "VERSION=${VERSION}" >> "$GITHUB_OUTPUT"
      - name: Prepare SAR App
        env:
          VERSION: ${{ steps.semantic-version.outputs.VERSION }}
        run: |
          # From the generated LayerStack cdk.out artifact, find the layer asset path for the correct architecture.
          # We'll use this as the source directory of our SAR. This way we are re-using the same layer asset for our SAR.
          asset=$(jq -jc '.Resources[] | select(.Properties.CompatibleArchitectures == ["${{ matrix.architecture }}"]) | .Metadata."aws:asset:path"' cdk.out/LayerV2Stack.template.json)

          # fill in the SAR SAM template
          sed \
            -e "s|<VERSION>|${VERSION}|g" \
            -e "s/<SAR_APP_NAME>/${{ env.SAR_NAME }}/g" \
            -e "s|<LAYER_CONTENT_PATH>|./cdk.out/$asset|g" \
            layer/sar/template.txt > template.yml

          # SAR needs a README and a LICENSE, so just copy the ones from the repo
          cp README.md LICENSE "./cdk.out/$asset/"

          # Debug purposes
          cat template.yml
      - name: Deploy SAR
        run: |
          # Package the SAR to our SAR S3 bucket, and publish it
          sam package --template-file template.yml --output-template-file packaged.yml --s3-bucket ${{ secrets.AWS_SAR_S3_BUCKET }}
          sam publish --template packaged.yml --region "$AWS_REGION"
      - name: Deploy BETA canary
        if: ${{ inputs.stage == 'BETA' }}
        run: |
          if [[ "${{ matrix.architecture }}" == "arm64" ]]; then
            TEST_STACK_NAME="${TEST_STACK_NAME}-arm64"
          fi

          echo "Check if stack does not exist"
          stack_exists=$(aws cloudformation list-stacks --query "StackSummaries[?(StackName == '$TEST_STACK_NAME' && StackStatus == 'CREATE_COMPLETE')].{StackId:StackId, StackName:StackName, CreationTime:CreationTime, StackStatus:StackStatus}" --output text)

          if [[ -n "$stack_exists" ]] ; then
            echo "Found test deployment stack, removing..."
            aws cloudformation delete-stack --stack-name "$TEST_STACK_NAME"
            aws cloudformation wait stack-delete-complete --stack-name "$TEST_STACK_NAME"
          fi

          echo "Creating canary stack"
          echo "Stack name: $TEST_STACK_NAME"
          aws serverlessrepo create-cloud-formation-change-set \
            --application-id arn:aws:serverlessrepo:${{ env.AWS_REGION }}:${{ steps.aws-credentials-sar-role.outputs.aws-account-id }}:applications/${{ env.SAR_NAME }} \
            --stack-name "${TEST_STACK_NAME/serverlessrepo-/}" \
            --capabilities CAPABILITY_NAMED_IAM

          CHANGE_SET_ID=$(aws cloudformation list-change-sets --stack-name "$TEST_STACK_NAME" --query 'Summaries[*].ChangeSetId' --output text)
          aws cloudformation wait change-set-create-complete --change-set-name "$CHANGE_SET_ID"
          aws cloudformation execute-change-set --change-set-name "$CHANGE_SET_ID"
          aws cloudformation wait stack-create-complete --stack-name "$TEST_STACK_NAME"

          echo "Waiting until stack deployment completes..."

          echo "Exit with error if stack is not in CREATE_COMPLETE"
          stack_exists=$(aws cloudformation list-stacks --query "StackSummaries[?(StackName == '$TEST_STACK_NAME' && StackStatus == 'CREATE_COMPLETE')].{StackId:StackId, StackName:StackName, CreationTime:CreationTime, StackStatus:StackStatus}")
          if [[ -z "$stack_exists" ]] ; then
            echo "Could find successful deployment, exit error..."
            exit 1
          fi
          echo "Deployment successful"
      - name: Publish SAR
        if: ${{ inputs.stage == 'PROD' }}
        run: |
          # wait until SAR registers the app, otherwise it fails to make it public
          sleep 15
          echo "Make SAR app public"
          aws serverlessrepo put-application-policy \
            --application-id arn:aws:serverlessrepo:${{ env.AWS_REGION }}:${{ steps.aws-credentials-sar-role.outputs.aws-account-id }}:applications/${{ env.SAR_NAME }} \
            --statements Principals='*',Actions=Deploy