name: CD

on:
  workflow_dispatch:
  push:
    branches:
      - main

env:
  PROJECT_ID: zealous-zebra
  REGION: us-east1
  ZONE: us-east1-b


jobs:

  build:
    name: Build images
    timeout-minutes: 30
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2.4.0
      with:
        persist-credentials: false

    - name: Set project and image names
      run: |
        BRANCH_NAME=$(expr $GITHUB_REF : '.*/\(.*\)') && \
        BRANCH_NAME=${BRANCH_NAME,,} && \
        REPOSITORY=${GITHUB_REPOSITORY,,} && \
        echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV && \
        echo "SHORT_SHA=$(git rev-parse --short=7 $GITHUB_SHA)" >> $GITHUB_ENV && \
        echo "REPOSITORY=$REPOSITORY" >> $GITHUB_ENV

    # Setup gcloud CLI
    - name: Set up gcloud SDK environment
      uses: google-github-actions/setup-gcloud@master
      with:
        version: '295.0.0'
        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="$SHORT_SHA",BRANCH_NAME="$BRANCH_NAME"

  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: Set project and image names
        run: |
          BRANCH_NAME=$(expr $GITHUB_REF : '.*/\(.*\)') && \
          BRANCH_NAME=${BRANCH_NAME,,} && \
          REPOSITORY=${GITHUB_REPOSITORY,,} && \
          echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV && \
          echo "SHORT_SHA=$(git rev-parse --short=7 $GITHUB_SHA)" >> $GITHUB_ENV && \
          echo "REPOSITORY=$REPOSITORY" >> $GITHUB_ENV

      # Setup gcloud CLI
      - name: Set up gcloud SDK environment
        uses: google-github-actions/setup-gcloud@master
        with:
          version: '295.0.0'
          project_id: ${{ env.PROJECT_ID }}
          service_account_key: ${{ secrets.GCLOUD_AUTH }}

      # Run once: create firewall rule to allow incoming traffic to the nodes
      # - name: Create Zcash incoming traffic firewall rule
      #   run: |
      #     gcloud compute firewall-rules create "allow-zcash" \
      #     --target-tags zebrad \
      #     --allow tcp:8233,tcp:18233 \
      #     --source-ranges 0.0.0.0/0 \
      #     --description="Allow incoming Zcash traffic from anywhere" \

      # Create instance template from container image
      - name: Create instance template
        run: |
          gcloud compute instance-templates create-with-container "zebrad-$BRANCH_NAME-$SHORT_SHA" \
          --container-image "gcr.io/$PROJECT_ID/$REPOSITORY/$BRANCH_NAME:$SHORT_SHA" \
          --create-disk name=zebrad-cache-$SHORT_SHA,auto-delete=yes,size=100GB,type=pd-balanced \
          --container-mount-disk mount-path="/zebrad-cache",name=zebrad-cache-$SHORT_SHA \
          --machine-type n2d-standard-4 \
          --service-account cos-vm@zealous-zebra.iam.gserviceaccount.com \
          --scopes cloud-platform \
          --tags zebrad \

      # Run once: create firewall rule to allow healthchecks
      # - name: Create healthcheck firewall rule
      #   run: |
      #     gcloud compute firewall-rules create "allow-tracing-health-check" \
      #     --target-tags zebrad \
      #     --allow tcp:3000 \
      #     --source-ranges 130.211.0.0/22,35.191.0.0/16 \
      #     --description="Allow HTTP requests to our tracing endpoint from Google's probes" \

      # 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-$BRANCH_NAME" | grep "$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-$BRANCH_NAME" \
          --template "zebrad-$BRANCH_NAME-$SHORT_SHA" \
          --health-check zebrad-tracing-filter \
          --initial-delay 30 \
          --region "$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-$BRANCH_NAME" \
          --version template="zebrad-$BRANCH_NAME-$SHORT_SHA" \
          --region "$REGION"
