name: CI

on:
  push:
    branches:
      - "master"
  pull_request:

# Control to what degree jobs in this workflow will run concurrently with
# other instances of themselves.
#
# https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#concurrency
concurrency:
  # We want every revision on master to run the workflow completely.
  # "head_ref" is not set for the "push" event but it is set for the
  # "pull_request" event.  If it is set then it is the name of the branch and
  # we can use it to make sure each branch has only one active workflow at a
  # time.  If it is not set then we can compute a unique string that gives
  # every master/push workflow its own group.
  group: "${{ github.head_ref || format('{0}-{1}', github.run_number, github.run_attempt) }}"

  # Then, we say that if a new workflow wants to start in the same group as a
  # running workflow, the running workflow should be cancelled.
  cancel-in-progress: true

env:
  # Tell Hypothesis which configuration we want it to use.
  TAHOE_LAFS_HYPOTHESIS_PROFILE: "ci"

jobs:

  coverage:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
        python-version:
          - 2.7
          - 3.7
          - 3.8
          - 3.9
        include:
          # On macOS don't bother with 3.7-3.8, just to get faster builds.
          - os: macos-10.15
            python-version: 2.7
          - os: macos-latest
            python-version: 3.9

    steps:
      # See https://github.com/actions/checkout. A fetch-depth of 0
      # fetches all tags and branches.
      - name: Check out Tahoe-LAFS sources
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v2
        with:
          python-version: ${{ matrix.python-version }}

      # To use pip caching with GitHub Actions in an OS-independent
      # manner, we need `pip cache dir` command, which became
      # available since pip v20.1+.  At the time of writing this,
      # GitHub Actions offers pip v20.3.3 for both ubuntu-latest and
      # windows-latest, and pip v20.3.1 for macos-latest.
      - name: Get pip cache directory
        id: pip-cache
        run: |
          echo "::set-output name=dir::$(pip cache dir)"

      # See https://github.com/actions/cache
      - name: Use pip cache
        uses: actions/cache@v2
        with:
          path: ${{ steps.pip-cache.outputs.dir }}
          key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install Python packages
        run: |
          pip install --upgrade codecov tox tox-gh-actions setuptools
          pip list

      - name: Display tool versions
        run: python misc/build_helpers/show-tool-versions.py

      - name: Run tox for corresponding Python version
        run: python -m tox

      - name: Upload eliot.log
        uses: actions/upload-artifact@v1
        with:
          name: eliot.log
          path: eliot.log

      - name: Upload trial log
        uses: actions/upload-artifact@v1
        with:
          name: test.log
          path: _trial_temp/test.log

      # Upload this job's coverage data to Coveralls.  While there is a GitHub
      # Action for this, as of Jan 2021 it does not support Python coverage
      # files - only lcov files.  Therefore, we use coveralls-python, the
      # coveralls.io-supplied Python reporter, for this.
      #
      # It is coveralls-python 1.x that has maintained compatibility
      # with Python 2, while coveralls-python 3.x is compatible with
      # Python 3.  Sadly we can't use them both in the same workflow.
      #
      # The two versions of coveralls-python are somewhat mutually
      # incompatible.  Mixing these two different versions when
      # reporting coverage to coveralls.io will lead to grief, since
      # they get job IDs in different fashion.  If we use both
      # versions of coveralls in the same workflow, the finalizing
      # step will be able to mark only part of the jobs as done, and
      # the other part will be left hanging, never marked as done: it
      # does not matter if we make an API call or `coveralls --finish`
      # to indicate that CI has finished running.
      #
      # So we try to use the newer coveralls-python that is available
      # via Python 3 (which is present in GitHub Actions tool cache,
      # even when we're running Python 2.7 tests) throughout this
      # workflow.
      - name: "Report Coverage to Coveralls"
        run: |
          pip3 install --upgrade coveralls==3.0.1
          python3 -m coveralls
        env:
          # Some magic value required for some magic reason.
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
          # Help coveralls identify our project.
          COVERALLS_REPO_TOKEN: "JPf16rLB7T2yjgATIxFzTsEgMdN1UNq6o"
          # Every source of coverage reports needs a unique "flag name".
          # Construct one by smashing a few variables from the matrix together
          # here.
          COVERALLS_FLAG_NAME: "run-${{ matrix.os }}-${{ matrix.python-version }}"
          # Mark the data as just one piece of many because we have more than
          # one instance of this job (Windows, macOS) which collects and
          # reports coverage.  This is necessary to cause Coveralls to merge
          # multiple coverage results into a single report.  Note the merge
          # only happens when we "finish" a particular build, as identified by
          # its "build_num" (aka "service_number").
          COVERALLS_PARALLEL: true

  # Tell Coveralls that we're done reporting coverage data.  Since we're using
  # the "parallel" mode where more than one coverage data file is merged into
  # a single report, we have to tell Coveralls when we've uploaded all of the
  # data files.  This does it.  We make sure it runs last by making it depend
  # on *all* of the coverage-collecting jobs.
  #
  # See notes about parallel builds on GitHub Actions at
  # https://coveralls-python.readthedocs.io/en/latest/usage/configuration.html
  finish-coverage-report:
    needs:
      - "coverage"
    runs-on: "ubuntu-latest"
    container: "python:3-slim"
    steps:
      - name: "Indicate completion to coveralls.io"
        run: |
          pip3 install --upgrade coveralls==3.0.1
          python3 -m coveralls --finish
        env:
          # Some magic value required for some magic reason.
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

  integration:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
        python-version:
          - 2.7
          - 3.7
          - 3.9
        include:
          # On macOS don't bother with 3.7, just to get faster builds.
          - os: macos-10.15
            python-version: 2.7
          - os: macos-latest
            python-version: 3.9

    steps:

      - name: Install Tor [Ubuntu]
        if: matrix.os == 'ubuntu-latest'
        run: sudo apt install tor

      # TODO: See https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3744.
      # We have to use an older version of Tor for running integration
      # tests on macOS.
      - name: Install Tor [macOS, ${{ matrix.python-version }} ]
        if: ${{ contains(matrix.os, 'macos') }}
        run: |
          brew extract --version 0.4.5.8 tor homebrew/cask
          brew install tor@0.4.5.8
          brew link --overwrite tor@0.4.5.8

      - name: Install Tor [Windows]
        if: matrix.os == 'windows-latest'
        uses: crazy-max/ghaction-chocolatey@v1
        with:
          args: install tor

      - name: Check out Tahoe-LAFS sources
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v1
        with:
          python-version: ${{ matrix.python-version }}

      - name: Get pip cache directory
        id: pip-cache
        run: |
          echo "::set-output name=dir::$(pip cache dir)"

      - name: Use pip cache
        uses: actions/cache@v2
        with:
          path: ${{ steps.pip-cache.outputs.dir }}
          key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install Python packages
        run: |
          pip install --upgrade tox
          pip list

      - name: Display tool versions
        run: python misc/build_helpers/show-tool-versions.py

      - name: Run "Python 2 integration tests"
        if: ${{ matrix.python-version == '2.7' }}
        run: tox -e integration

      - name: Run "Python 3 integration tests"
        if: ${{ matrix.python-version != '2.7' }}
        run: tox -e integration3

      - name: Upload eliot.log in case of failure
        uses: actions/upload-artifact@v1
        if: failure()
        with:
          name: integration.eliot.json
          path: integration.eliot.json

  packaging:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os:
          - macos-10.15
          - windows-latest
          - ubuntu-latest
        python-version:
          - 2.7

    steps:

      - name: Check out Tahoe-LAFS sources
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v1
        with:
          python-version: ${{ matrix.python-version }}

      - name: Get pip cache directory
        id: pip-cache
        run: |
          echo "::set-output name=dir::$(pip cache dir)"

      - name: Use pip cache
        uses: actions/cache@v2
        with:
          path: ${{ steps.pip-cache.outputs.dir }}
          key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install Python packages
        run: |
          pip install --upgrade tox
          pip list

      - name: Display tool versions
        run: python misc/build_helpers/show-tool-versions.py

      - name: Run "tox -e pyinstaller"
        run: tox -e pyinstaller

      # This step is to ensure there are no packaging/import errors.
      - name: Test PyInstaller executable
        run: dist/Tahoe-LAFS/tahoe --version

      - name: Upload PyInstaller package
        uses: actions/upload-artifact@v2
        with:
          name: Tahoe-LAFS-${{ matrix.os }}-Python-${{ matrix.python-version }}
          path: dist/Tahoe-LAFS-*-*.*