name: CD

# Ensures that only one workflow task will run at a time. Previous deployments, if
# already in process, won't get cancelled. Instead, we let the first to complete
# then queue the latest pending workflow, cancelling any workflows in between
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: false

on:
  workflow_dispatch:
    inputs:
      network:
        default: 'Mainnet'
        description: 'Network to deploy: Mainnet or Testnet'
        required: true
      checkpoint_sync:
        default: 'true'
        description: 'Use as many checkpoints as possible when syncing'
        required: true
  push:
    branches:
      - main
  release:
    types:
      - published

jobs:
  # If a release was made we want to extract the first part of the semver from the
  # tag_name
  #
  # Generate the following output to pass to subsequent jobs
  # - If our semver is `v1.3.0` the resulting output from this job would be `v1`
  #
  # Note: We just use the first part of the version to replace old instances, and change
  # it when a major version is released, to keep a segregation between new and old
  # versions.
  versioning:
    name: Versioning
    runs-on: ubuntu-latest
    outputs:
      major_version: ${{ steps.set.outputs.major_version }}
    if: ${{ github.event_name == 'release' }}
    steps:
      - name: Getting Zebrad Version
        id: get
        uses: actions/github-script@v6.4.1
        with:
          result-encoding: string
          script: |
            return context.payload.release.tag_name.substring(0,2)
      - name: Setting API Version
        id: set
        run: echo "major_version=${{ steps.get.outputs.result }}" >> "$GITHUB_OUTPUT"

  # Each time this workflow is executed, a build will be triggered to create a new image
  # with the corresponding tags using information from Git
  #
  # The image will be commonly named `zebrad:<short-hash | github-ref | semver>`
  build:
    name: Build CD Docker
    uses: ./.github/workflows/build-docker-image.yml
    with:
      dockerfile_path: ./docker/Dockerfile
      dockerfile_target: runtime
      image_name: zebrad
      # We need to hard-code Mainnet here, because env is not allowed in this context
      network: ${{ inputs.network || 'Mainnet' }}
      checkpoint_sync: true
      rust_backtrace: '1'
      zebra_skip_ipv6_tests: '1'
      rust_log: info

  # Test that Zebra works using the default config with the latest Zebra version
  test-configuration-file:
    name: Test Zebra default Docker config file
    timeout-minutes: 5
    runs-on: ubuntu-latest
    needs: build
    steps:
      - uses: r7kamura/rust-problem-matchers@v1.3.0

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

      - name: Run tests using the default config
        run: |
          set -ex
          docker pull ${{ vars.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }}
          docker run --detach --name default-conf-tests -t ${{ vars.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }}
          EXIT_STATUS=$(docker logs --tail all --follow default-conf-tests 2>&1 | grep -q --extended-regexp --max-count=1 -e 'estimated progress to chain tip.*BeforeOverwinter'; echo $?; )
          docker stop default-conf-tests
          docker logs default-conf-tests
          exit "$EXIT_STATUS"

  # This jobs handles the deployment of a Managed Instance Group (MiG) with 2 nodes in
  # the us-central1 region. Two different groups of MiGs are deployed one for pushes to
  # the main branch and another for version releases of Zebra
  #
  # Once this workflow is triggered the previous MiG is replaced, on pushes to main its
  # always replaced, and with releases its only replaced if the same major version is
  # being deployed, otherwise a new major version is deployed
  #
  # Runs:
  # - on every push/merge to the `main` branch
  # - on every release, when it's published
  deploy-nodes:
    name: Deploy ${{ inputs.network || 'Mainnet' }} nodes
    needs: [ build, test-configuration-file, versioning ]
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: 'read'
      id-token: 'write'
    if: ${{ !cancelled() && !failure() && ((github.event_name == 'push' && github.ref_name == 'main') || github.event_name == 'release') }}

    steps:
      - uses: actions/checkout@v3.5.2
        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 || 'Mainnet' }}.
      #
      # Passes the lowercase network to subsequent steps using $NETWORK env variable.
      - name: Downcase network name for labels
        run: |
          NETWORK_CAPS="${{ inputs.network || 'Mainnet' }}"
          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

      # TODO we should implement the fixes from https://github.com/ZcashFoundation/zebra/pull/5670 here
      # but the implementation is failing as it's requiring the disk names, contrary to what is stated in the official documentation
      - name: Create instance template
        run: |
          gcloud compute instance-templates create-with-container zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }} \
          --boot-disk-type=pd-ssd \
          --image-project=cos-cloud \
          --image-family=cos-stable \
          --container-image ${{ vars.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }} \
          --create-disk=name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }},auto-delete=yes,size=300GB,type=pd-ssd \
          --container-mount-disk=mount-path="/zebrad-cache",name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }} \
          --machine-type ${{ vars.GCP_SMALL_MACHINE }} \
          --network-interface=subnet=${{ vars.GCP_SUBNETWORK }} \
          --service-account ${{ vars.GCP_DEPLOYMENTS_SA }} \
          --scopes cloud-platform \
          --labels=app=zebrad,environment=prod,network=${NETWORK},github_ref=${{ env.GITHUB_REF_SLUG_URL }} \
          --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-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" | grep "${{ 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 \
          "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" \
          --template "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
          --health-check zebrad-tracing-filter \
          --initial-delay 30 \
          --region "${{ vars.GCP_REGION }}" \
          --size 1

      # 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-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" \
          --version template="zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
          --region "${{ vars.GCP_REGION }}"

  # This jobs handles the deployment of a single node (1) in the us-central1-a zone
  # when an instance is required to test a specific commit
  #
  # Runs:
  # - on request, using workflow_dispatch with regenerate-disks
  #
  # Note: this instances are not automatically replaced or deleted
  deploy-instance:
    name: Deploy single instance
    needs: [ build, test-configuration-file ]
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: 'read'
      id-token: 'write'
    if: github.event_name == 'workflow_dispatch'

    steps:
      - uses: actions/checkout@v3.5.2
        with:
          persist-credentials: false

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

      # 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: Manual deploy of a single instance running zebrad
        run: |
          gcloud compute instances create-with-container "zebrad-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
          --boot-disk-size 300GB \
          --boot-disk-type=pd-ssd \
          --image-project=cos-cloud \
          --image-family=cos-stable \
          --container-stdin \
          --container-tty \
          --container-image ${{ vars.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }} \
          --create-disk=auto-delete=yes,size=300GB,type=pd-ssd \
          --create-disk=name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }},auto-delete=yes,size=300GB,type=pd-ssd \
          --container-mount-disk=mount-path='/zebrad-cache',name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }} \
          --machine-type ${{ vars.GCP_SMALL_MACHINE }} \
          --network-interface=subnet=${{ vars.GCP_SUBNETWORK }} \
          --service-account ${{ vars.GCP_DEPLOYMENTS_SA }} \
          --labels=app=zebrad,environment=qa,network=${NETWORK},github_ref=${{ env.GITHUB_REF_SLUG_URL }} \
          --tags zebrad \
          --zone ${{ vars.GCP_ZONE }}