Add tox envs for building dists via PEP 517

.github/workflows/test-library.yml

@@ -37,6 +37,82 @@ jobs:
       - name: Integration testing
         if: matrix.os != 'windows'
         run: |
-          python setup.py install
+          pip install .
           proxy --hostname 127.0.0.1 --enable-web-server --pid-file proxy.pid --log-file proxy.log &
           ./tests/integration/main.sh
+
+  tox:
+    name: ${{ matrix.toxenv }}
+
+    runs-on: Ubuntu-latest
+    strategy:
+      matrix:
+        toxenv:
+        - cleanup-dists,build-dists,metadata-validation
+      fail-fast: false
+
+    env:
+      PY_COLORS: 1
+      TOX_PARALLEL_NO_SPINNER: 1
+      TOXENV: ${{ matrix.toxenv }}
+
+    steps:
+    - name: Switch to using Python v3.10
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+    - name: >-
+        Calculate Python interpreter version hash value
+        for use in the cache key
+      id: calc-cache-key-py
+      run: |
+        from hashlib import sha512
+        from sys import version
+
+        hash = sha512(version.encode()).hexdigest()
+        print(f'::set-output name=py-hash-key::{hash}')
+      shell: python
+    - name: Get pip cache dir
+      id: pip-cache
+      run: >-
+        echo "::set-output name=dir::$(pip cache dir)"
+    - name: Set up pip cache
+      uses: actions/[email protected]
+      with:
+        path: ${{ steps.pip-cache.outputs.dir }}
+        key: >-
+          ${{ runner.os }}-pip-${{
+          steps.calc-cache-key-py.outputs.py-hash-key }}-${{
+          hashFiles('tox.ini') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{
+              steps.calc-cache-key-py.outputs.py-hash-key
+          }}-
+          ${{ runner.os }}-pip-
+    - name: Install tox
+      run: >-
+        python -m
+        pip install
+        --user
+        tox
+
+    - name: Grab the source from Git
+      uses: actions/checkout@v2
+
+    - name: >-
+        Pre-populate tox envs: `${{ env.TOXENV }}`
+      run: >-
+        python -m
+        tox
+        --parallel auto
+        --parallel-live
+        --skip-missing-interpreters false
+        --notest
+    - name: >-
+        Run tox envs: `${{ env.TOXENV }}`
+      run: >-
+        python -m
+        tox
+        --parallel auto
+        --parallel-live
+        --skip-missing-interpreters false

setup.py

@@ -17,7 +17,7 @@
 __author__ = 'Abhinav Singh'
 __author_email__ = '[email protected]'
 __homepage__ = 'https://github.com/abhinavsingh/proxy.py'
-__download_url__ = '%s/archive/master.zip' % __homepage__
+__download_url__ = '%s/archive/develop.zip' % __homepage__
 __license__ = 'BSD'
 
 if __name__ == '__main__':
@@ -33,7 +33,7 @@
         long_description_content_type='text/markdown',
         download_url=__download_url__,
         license=__license__,
-        python_requires='!=2.*, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
+        python_requires='>= 3.6',
         zip_safe=False,
         packages=find_packages(exclude=['tests', 'tests.*']),
         package_data={'proxy': ['py.typed']},

tox.ini

@@ -1,8 +1,69 @@
 [tox]
 envlist = py35,py36,py37,py38
+isolated_build = true
+minversion = 3.21.0
 
 [testenv]
 deps =
     -rrequirements.txt
     -rrequirements-testing.txt
 command = pytest
+
+
+[dists]
+setenv =
+  PEP517_OUT_DIR = {env:PEP517_OUT_DIR:{toxinidir}{/}dist}
+
+
+[testenv:cleanup-dists]
+description =
+  Wipe the the `{env:PEP517_OUT_DIR}{/}` folder
+usedevelop = false
+skip_install = true
+deps =
+setenv =
+  {[dists]setenv}
+commands =
+  {envpython} -c \
+    'import os, shutil, sys; dists_dir = os.getenv("PEP517_OUT_DIR"); shutil.rmtree(dists_dir, ignore_errors=True); sys.exit(os.path.exists(dists_dir))'
+
+
+[testenv:build-dists]
+description =
+  Build non-universal dists and put them into
+  the `{env:PEP517_OUT_DIR}{/}` folder
+depends =
+  cleanup-dists
+isolated_build = true
+# `usedevelop = true` overrides `skip_install` instruction, it's unwanted
+usedevelop = false
+skip_install = true
+deps =
+  build >= 0.7.0, < 0.8.0
+passenv =
+  PEP517_BUILD_ARGS
+setenv =
+  {[dists]setenv}
+commands =
+  {envpython} -m build \
+    --outdir '{env:PEP517_OUT_DIR}{/}' \
+    {posargs:{env:PEP517_BUILD_ARGS:}} \
+    '{toxinidir}'
+
+
+[testenv:metadata-validation]
+description =
+  Verify that dists under the `{env:PEP517_OUT_DIR}{/}` dir
+  have valid metadata
+depends =
+  build-dists
+deps =
+  twine
+usedevelop = false
+skip_install = true
+setenv =
+  {[dists]setenv}
+commands =
+  {envpython} -m twine check \
+    --strict \
+    {env:PEP517_OUT_DIR}{/}*