prometheus-exporters/.gitea/workflows/varnish-exporter.yml

on:
  schedule:
    - cron: '0 5 * * *'
  push:
    tags:
      - '*'
    branches:
      - "*"

jobs:
  validate:
    runs-on: ubuntu-latest
    outputs:
      build: ${{ steps.check_version.outputs.build }}
      version: ${{ steps.check_version.outputs.version }}
    steps:
      - uses: actions/checkout@v4

      - name: Check for latest release version
        id: check_version
        run: |
          # Define version file specific to this exporter
          VERSION_FILE=".varnish-exporter.version"
          
          # Initialize if missing
          if [ ! -f "$VERSION_FILE" ]; then echo "0.0.0" > "$VERSION_FILE"; fi
          
          CURRENT=$(cat "$VERSION_FILE")
          # Get latest tag. Fail silently on curl error, verify json output
          LATEST=$(curl --silent --fail https://api.github.com/repos/jonnenauha/prometheus_varnish_exporter/releases/latest | jq -r .tag_name | sed "s/^v//")

          if [ -z "$LATEST" ] || [ "$LATEST" = "null" ]; then
            echo "::error::Failed to fetch latest version from GitHub"
            exit 1
          fi

          echo "Current local version: $CURRENT"
          echo "Latest remote version: $LATEST"

          # Version comparison using sort -V (Handles 1.10 > 1.9 correctly)
          if [ "$CURRENT" != "$LATEST" ]; then
            # Sort the two versions and take the last one (the highest)
            NEWER=$(printf "%s\n%s" "$CURRENT" "$LATEST" | sort -V | tail -n1)
            
            if [ "$NEWER" = "$LATEST" ]; then
              echo "New version detected: $LATEST"
              echo "$LATEST" > "$VERSION_FILE"
              echo "build=true" >> $GITHUB_OUTPUT
              echo "version=$LATEST" >> $GITHUB_OUTPUT
              echo "VERSION=$LATEST" >> $GITHUB_ENV
            else
              echo "Remote version ($LATEST) is not newer than local ($CURRENT). Skipping."
              echo "build=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "Up to date."
            echo "build=false" >> $GITHUB_OUTPUT
          fi

      - uses: stefanzweifel/git-auto-commit-action@v6
        with:
          branch: main
          file_pattern: '.varnish-exporter.version'
          commit_user_name: gitea-actions[bot]
          commit_user_email: no-reply@brainsys.io
          commit_message: "chore(varnish): update version to ${{ env.VERSION }}"
          tagging_message: 'varnish-v${{ env.VERSION }}'
          push_options: '--force'

      - name: DEBUG - build value
        run: echo "${{ steps.check_version.outputs.build }}"

  build:
    needs: validate
    if: needs.validate.outputs.build == 'true'
    timeout-minutes: 2
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set version to env vars
        run: |
          echo "${{ needs.validate.outputs.version }}"
          echo "VERSION=${{ needs.validate.outputs.version }}" >> $GITHUB_ENV

      - name: Setup go
        uses: actions/setup-go@v4
        with:
          go-version: '>=1.20'

      - name: Checkout varnish exporter
        run: git clone https://github.com/jonnenauha/prometheus_varnish_exporter varnish

      - name: Build varnish exporter for GNU/Linux / amd64
        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o ../bin/prometheus-varnish-exporter-amd64
        working-directory: varnish

      - name: Build varnish exporter for GNU/Linux / arm64
        run: CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -o ../bin/prometheus-varnish-exporter-arm64
        working-directory: varnish

      - name: Create deb dir tree
        run: |
          mkdir -p varnish-exporter-amd64/usr/bin
          mkdir -p varnish-exporter-amd64/DEBIAN
          mkdir -p varnish-exporter-arm64/usr/bin
          mkdir -p varnish-exporter-arm64/DEBIAN

      - name: Copy binaries
        run: |
          cp bin/prometheus-varnish-exporter-amd64 varnish-exporter-amd64/usr/bin/prometheus-varnish-exporter
          cp bin/prometheus-varnish-exporter-arm64 varnish-exporter-arm64/usr/bin/prometheus-varnish-exporter

      - name: Prepare amd64 control file
        run: |
          echo "Package: prometheus-varnish-exporter" > varnish-exporter-amd64/DEBIAN/control
          echo "Version: $VERSION" >> varnish-exporter-amd64/DEBIAN/control
          echo "Maintainer: Ludovic Cartier <ludovic.cartier@brainsys.io>" >> varnish-exporter-amd64/DEBIAN/control
          echo "Architecture: amd64" >> varnish-exporter-amd64/DEBIAN/control
          echo "Homepage: https://git.brainsys.io/packages/prometheus-exporters" >> varnish-exporter-amd64/DEBIAN/control
          echo "Description: Prometheus Varnish Exporter package for GNU/Linux Debian" >> varnish-exporter-amd64/DEBIAN/control

      - name: Prepare arm64 control file
        run: |
          echo "Package: prometheus-varnish-exporter" > varnish-exporter-arm64/DEBIAN/control
          echo "Version: $VERSION" >> varnish-exporter-arm64/DEBIAN/control
          echo "Maintainer: Ludovic Cartier <ludovic.cartier@brainsys.io>" >> varnish-exporter-arm64/DEBIAN/control
          echo "Architecture: arm64" >> varnish-exporter-arm64/DEBIAN/control
          echo "Homepage: https://git.brainsys.io/packages/prometheus-exporters" >> varnish-exporter-arm64/DEBIAN/control
          echo "Description: Prometheus Varnish Exporter package for GNU/Linux Debian" >> varnish-exporter-arm64/DEBIAN/control

      - name: Build deb files
        run: |
          dpkg -b varnish-exporter-amd64 bin/prometheus-varnish-exporter_$VERSION-1_amd64.deb
          dpkg -b varnish-exporter-arm64 bin/prometheus-varnish-exporter_$VERSION-1_arm64.deb

      - name: Release packages
        run: |
          curl -s -u "${{ secrets.PACKAGE_TOKEN }}" --upload-file bin/prometheus-varnish-exporter_$VERSION-1_amd64.deb \
            https://git.brainsys.io/api/packages/packages/debian/pool/stable/main/upload
          curl -s -u "${{ secrets.PACKAGE_TOKEN }}" --upload-file bin/prometheus-varnish-exporter_$VERSION-1_arm64.deb \
            https://git.brainsys.io/api/packages/packages/debian/pool/stable/main/upload

      - name: Create release
        uses: akkuman/gitea-release-action@v1
        with:
          tag_name: "${{ env.VERSION }}"
          files: |-
            bin/**
          token: "${{ secrets.RELEASE_TOKEN }}"

      - name: Send notification to mattermost
        uses: rtCamp/action-slack-notify@v2
        env:
          SLACK_WEBHOOK: "${{ secrets.MATTERMOST_WEBHOOK }}"
          SLACK_USERNAME: gitea-bot
          SLACK_CHANNEL: gitea-actions
          SLACK_COLOR: "${{ job.status }}"
          SLACK_CUSTOM_PAYLOAD: '{"username": "gitea-bot", "icon_url": "https://w7.pngwing.com/pngs/940/571/png-transparent-gitea-hd-logo-thumbnail.png", "text": "varnish-exporter build has just finished in version ${{ env.VERSION }} !"}'