name: Check Domain Availability
on:
  # manual trigger only
  workflow_dispatch:

jobs:
  check:
    name: Check (shard ${{ matrix.shard }}/6)
    runs-on: ubuntu-slim

    strategy:
      # Keep every shard running even if one hits a fatal error, so we still
      # collect dead domains from the rest.
      fail-fast: false
      matrix:
        # 6 shards -> 6 runners, each lands on a different Azure region / egress
        # IP, spreading DoH load and reducing per-server rate limiting.
        shard: [0, 1, 2, 3, 4, 5]

    steps:
      # - name: Tune GitHub-hosted runner network
      #   # https://github.com/actions/runner-images/issues/1187
      #   uses: smorimoto/tune-github-hosted-runner-network@v1
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
      - uses: pnpm/action-setup@v5
        with:
          run_install: false
      - uses: actions/setup-node@v6
        with:
          node-version-file: ".node-version"
          cache: "pnpm"
      - name: Get current date
        id: date
        run: |
          echo "date=$(date +'%Y-%m-%d %H:%M:%S')" >> $GITHUB_OUTPUT
          echo "year=$(date +'%Y')" >> $GITHUB_OUTPUT
          echo "month=$(date +'%m')" >> $GITHUB_OUTPUT
          echo "day=$(date +'%d')" >> $GITHUB_OUTPUT
          echo "hour=$(date +'%H')" >> $GITHUB_OUTPUT
          echo "minute=$(date +'%M')" >> $GITHUB_OUTPUT
          echo "second=$(date +'%S')" >> $GITHUB_OUTPUT
      - name: Restore cache.db
        uses: actions/cache/restore@v5
        id: cache-db-restore
        with:
          path: |
            .cache
          # Cache is keyed per shard: each shard checks a disjoint subset of
          # domains, so their DoH/whois caches don't overlap.
          key: ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-${{ steps.date.outputs.day }} ${{ steps.date.outputs.hour }}:${{ steps.date.outputs.minute }}:${{ steps.date.outputs.second }}
          # If source files changed but packages didn't, rebuild from a prior cache.
          restore-keys: |
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-${{ steps.date.outputs.day }} ${{ steps.date.outputs.hour }}:${{ steps.date.outputs.minute }}:
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-${{ steps.date.outputs.day }} ${{ steps.date.outputs.hour }}:
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-${{ steps.date.outputs.day }}
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-
            ${{ runner.os }}-shard${{ matrix.shard }}-v3-
      - run: pnpm config set --location=global minimumReleaseAge 0
      - run: pnpm install
      - run: pnpm run node Build/validate-domain-alive.ts
        env:
          DEBUG: domain-alive:dead-domain,domain-alive:error:*
          SHARD_INDEX: ${{ matrix.shard }}
          SHARD_TOTAL: 6
      - name: Cache cache.db
        if: always()
        uses: actions/cache/save@v5
        with:
          path: |
            .cache
          key: ${{ runner.os }}-shard${{ matrix.shard }}-v3-${{ steps.date.outputs.year }}-${{ steps.date.outputs.month }}-${{ steps.date.outputs.day }} ${{ steps.date.outputs.hour }}:${{ steps.date.outputs.minute }}:${{ steps.date.outputs.second }}