name: Zcashd Manual Deploy

on:
  workflow_dispatch:
    inputs:
      network:
        default: 'Mainnet'
        description: 'Network to deploy: Mainnet or Testnet'
        required: true
      size:
        default: '10'
        description: 'GCP Managed Instance Group size'
        required: true

jobs:
  deploy:
    name: Deploy zcashd nodes
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: 'read'
      id-token: 'write'

    steps:
      - uses: actions/checkout@v3.5.3
        with:
          persist-credentials: false

      - name: Inject slug/short variables
        uses: rlespinasse/github-slug-action@v4
        with:
          short-length: 7

      # Makes the Zcash network name lowercase.
      #
      # Labels in GCP are required to be in lowercase, but the blockchain network
      # uses sentence case, so we need to downcase ${{ inputs.network }}.
      #
      # Passes ${{ inputs.network }} to subsequent steps using $NETWORK env variable.
      - name: Downcase network name for labels
        run: |
          NETWORK_CAPS="${{ inputs.network }}"
          echo "NETWORK=${NETWORK_CAPS,,}" >> "$GITHUB_ENV"

      # Setup gcloud CLI
      - name: Authenticate to Google Cloud
        id: auth
        uses: google-github-actions/auth@v1.1.1
        with:
          retries: '3'
          workload_identity_provider: '${{ vars.GCP_WIF }}'
          service_account: '${{ vars.GCP_DEPLOYMENTS_SA }}'

      - name: Set up Cloud SDK
        uses: google-github-actions/setup-gcloud@v1.1.1

      # Create instance template from container image
      - name: Create instance template
        run: |
          gcloud compute instance-templates create-with-container zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }} \
          --boot-disk-size 10GB \
          --boot-disk-type=pd-ssd \
          --image-project=cos-cloud \
          --image-family=cos-stable \
          --container-stdin \
          --container-tty \
          --container-image electriccoinco/zcashd \
          --container-env ZCASHD_NETWORK="${{ inputs.network }}" \
          --machine-type ${{ vars.GCP_SMALL_MACHINE }} \
          --network-interface=subnet=${{ vars.GCP_SUBNETWORK }} \
          --service-account ${{ vars.GCP_DEPLOYMENTS_SA }} \
          --scopes cloud-platform \
          --labels=app=zcashd,environment=prod,network=${NETWORK},github_ref=${{ env.GITHUB_REF_SLUG_URL }} \
          --tags zcashd

      # 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 "zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ inputs.network }}" | grep "${{ vars.GCP_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 \
          "zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ inputs.network }}" \
          --template "zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
          --region "${{ vars.GCP_REGION }}" \
          --size "${{ github.event.inputs.size }}"

      # 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 \
          "zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ inputs.network }}" \
          --version template="zcashd-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
          --region "${{ vars.GCP_REGION }}"