name: Linting

# Trigger on pull requests and pushes to master branch where Go-related files
# have been changed.
on:
  push:
    paths:
    - "go.mod"
    - "go.sum"
    - "**.go"
    - ".github/workflows/lint.yml"
    - "tools/e2e-output.txt"
    branches:
      - master
  pull_request:
    paths:
    - "go.mod"
    - "go.sum"
    - "**.go"
    - ".github/workflows/lint.yml"
    - "tools/e2e-output.txt"
    branches:
      - master

env:
  PROMU_VER: 'v0.13.0'

jobs:
  test:
    runs-on: windows-2019
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-go@v2
        with:
          go-version: '^1.17.5'

      - name: Test
        run: make test

      - name: Install e2e deps
        run: |
          go install "github.com/prometheus/promu@$($Env:PROMU_VER)"
          go install github.com/josephspurrier/goversioninfo/cmd/goversioninfo@v1.2.0
          # GOPATH\bin dir must be appended to PATH else the `promu` command won't be found
          echo "$(go env GOPATH)\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

      - name: e2e Test
        run: make e2e-test

  promtool:
    runs-on: windows-2019
    env:
      PROMTOOL_VER: '2.32.1'
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-go@v2
        with:
          go-version: '^1.17.5'

      - name: Install promtool
        run: |
          # promtool brings in a lot of dependencies, slowing down compilation via `go get` and `go install`, so
          # download the binary directly and extract.
          # go get github.com/prometheus/prometheus/cmd/promtool@main
          Invoke-WebRequest -Uri https://github.com/prometheus/prometheus/releases/download/v$($Env:PROMTOOL_VER)/prometheus-$($Env:PROMTOOL_VER).windows-amd64.zip -OutFile prometheus-$($Env:PROMTOOL_VER).windows-amd64.zip
          Expand-Archive -Path prometheus-$($Env:PROMTOOL_VER).windows-amd64.zip -DestinationPath .
          Copy-Item -Path prometheus-$($Env:PROMTOOL_VER).windows-amd64\promtool.exe -Destination "$(go env GOPATH)\bin"

          go install "github.com/prometheus/promu@$($Env:PROMU_VER)"
          go install github.com/josephspurrier/goversioninfo/cmd/goversioninfo@v1.2.0
          # GOPATH\bin dir must be appended to PATH else the `promu` command won't be found
          echo "$(go env GOPATH)\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

      - name: Promtool
        run: make promtool

  lint:
    runs-on: windows-2022
    steps:
      # `gofmt` linter run by golangci-lint fails on CRLF line endings (the default for Windows)
      - name: Set git to use LF
        run: |
          git config --global core.autocrlf false
          git config --global core.eol lf

      - uses: actions/checkout@v2
      - uses: actions/setup-go@v2
        with:
          go-version: '^1.17.5'

      - name: golangci-lint
        uses: golangci/golangci-lint-action@v3
        with:
          version: v1.45.2
          args: "--timeout=5m"

      # golangci-lint action doesn't always provide helpful output, so re-run without the action for
      # better output of the problem.
      # The cache from the golangci-lint step is re-used here, so this step should finish quickly.
      - name: errors
        if: ${{ failure() }}
        run: golangci-lint run --timeout=5m -c .golangci.yaml