name: Windows race

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - '*'

jobs:
  test:
    runs-on: windows-latest

    if: "!contains(github.event.head_commit.message, '[ci skip]')"

    steps:

    - name: Install Go
      uses: actions/setup-go@v3
      with:
        go-version: 1.19.x

    - name: Checkout code
      uses: actions/checkout@v3

    - name: Restore Cache
      uses: actions/cache@v3
      with:
        # Note: unlike some other setups, this is only grabbing the mod download
        # cache, rather than the whole mod directory, as the download cache
        # contains zips that can be unpacked in parallel faster than they can be
        # fetched and extracted by tar
        path: |
          ~/go/pkg/mod/cache
          ~\AppData\Local\go-build

        # The -2- here should be incremented when the scheme of data to be
        # cached changes (e.g. path above changes).
        # The -race- here ensures that non-race builds and race builds do not
        # overwrite each others cache, as while they share some files, they
        # differ in most by volume (build cache).
        # TODO(raggi): add a go version here.
        key: ${{ runner.os }}-go-2-race-${{ hashFiles('**/go.sum') }}

    - name: Print toolchain details
      run: gcc -v

    # There is currently an issue in the race detector in Go on Windows when
    # used with a newer version of GCC.
    # See https://github.com/tailscale/tailscale/issues/4926.
    - name: Downgrade MinGW
      shell: bash
      run: |
        choco install mingw --version 10.2.0 --allow-downgrade

    - name: Test with -race flag
      # Don't use -bench=. -benchtime=1x.
      # Somewhere in the layers (powershell?)
      # the equals signs cause great confusion.
      run: go test -race -bench . -benchtime 1x ./...

    - uses: k0kubun/action-slack@v2.0.0
      with:
        payload: |
          {
            "attachments": [{
              "text": "${{ job.status }}: ${{ github.workflow }} <https://github.com/${{ github.repository }}/commit/${{ github.sha }}/checks|${{ env.COMMIT_DATE }} #${{ env.COMMIT_NUMBER_OF_DAY }}> " +
                      "(<https://github.com/${{ github.repository }}/commit/${{ github.sha }}|" + "${{ github.sha }}".substring(0, 10) + ">) " +
                      "of ${{ github.repository }}@" + "${{ github.ref }}".split('/').reverse()[0] + " by ${{ github.event.head_commit.committer.name }}",
              "color": "danger"
            }]
          }
      env:
        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
      if: failure() && github.event_name == 'push'