name: CD

on:
  workflow_dispatch:
  push:
    branches:
      - main

env:
  PROJECT_ID: ${{ secrets.GCP_PROJECT_ID }}
  REGION: us-east1
  ZONE: us-east1-b
  MACHINE_TYPE: n2d-standard-4
  DEPLOY_SA: cos-vm@${{ secrets.GCP_PROJECT_ID }}.iam.gserviceaccount.com

jobs:
  build:
    name: Build images
    timeout-minutes: 60
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2.4.0
      with:
        persist-credentials: false

    - name: Inject slug/short variables
      uses: rlespinasse/github-slug-action@v4

    # Setup gcloud CLI
    - name: Set up gcloud SDK environment
      uses: google-github-actions/setup-gcloud@v0.5.0
      with:
        project_id: ${{ env.PROJECT_ID }}
        service_account_key: ${{ secrets.GCLOUD_AUTH }}

    # Build and push image to Google Container Registry
    - name: Build
      # Tagging w/ the commit SHA blocks the :latest tag on GCR
      run: |
        gcloud builds submit \
          --config cloudbuild.yaml \
          --substitutions SHORT_SHA="${{ env.GITHUB_SHA_SHORT }}",BRANCH_NAME="${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}"

  deploy:
    name: Deploy mainnet nodes
    needs: build
    runs-on: ubuntu-latest
    timeout-minutes: 30
    steps:
      - uses: actions/checkout@v2.4.0
        with:
          persist-credentials: false

      - name: Inject slug/short variables
        uses: rlespinasse/github-slug-action@v4

      # Setup gcloud CLI
      - name: Set up gcloud SDK environment
        uses: google-github-actions/setup-gcloud@v0.5.0
        with:
          project_id: ${{ env.PROJECT_ID }}
          service_account_key: ${{ secrets.GCLOUD_AUTH }}

      # Create instance template from container image
      - name: Create instance template
        run: |
          gcloud compute instance-templates create-with-container "zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}-${{ env.GITHUB_SHA_SHORT }}" \
          --container-image "gcr.io/${{ env.PROJECT_ID}}/${{ env.GITHUB_REPOSITORY_NAME_PART_SLUG }}/${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}:${{ env.GITHUB_SHA_SHORT }}" \
          --create-disk name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }},auto-delete=yes,size=100GB,type=pd-balanced \
          --container-mount-disk mount-path="/zebrad-cache",name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }} \
          --machine-type ${{ env.MACHINE_TYPE }} \
          --service-account ${{ env.DEPLOY_SA }} \
          --scopes cloud-platform \
          --tags zebrad \

      # Check if our destination instance group exists already
      - name: Check if instance group exists
        id: does-group-exist
        continue-on-error: true
        run: |
          gcloud compute instance-groups list | grep "zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}" | grep "${{ env.REGION }}"

      # Deploy new managed instance group using the new instance template
      - name: Create managed instance group
        if: steps.does-group-exist.outcome == 'failure'
        run: |
          gcloud compute instance-groups managed create \
          "zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}" \
          --template "zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}-${{ env.GITHUB_SHA_SHORT }}" \
          --health-check zebrad-tracing-filter \
          --initial-delay 30 \
          --region "${{ env.REGION }}" \
          --size 2

      # Rolls out update to existing group using the new instance template
      - name: Update managed instance group
        if: steps.does-group-exist.outcome == 'success'
        run: |
          gcloud compute instance-groups managed rolling-action start-update \
          "zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}" \
          --version template="zebrad-${{ env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }}-${{ env.GITHUB_SHA_SHORT }}" \
          --region "${{ env.REGION }}"