Created a pure-Python wheel and added a test for it.

PiperOrigin-RevId: 446752839

.github/workflows/python_tests.yml

@@ -93,9 +93,45 @@ jobs:
         run: pip install -vvv --no-index --find-links wheels protobuf protobuftests
       - name: Test that module is importable
         run: python -c 'from google._upb import _message; assert "google._upb._message.MessageMeta" in str(_message.MessageMeta)'
+        if: ${{ !matrix.pure_python }}
       - name: Run the unit tests
         run: |
           TESTS=$(pip show -f protobuftests | grep pb_unit_tests.*py$ | sed 's,/,.,g' | sed 's,\\,.,g' | sed -E 's,.py$,,g')
           for test in $TESTS; do
             python -m unittest -v $test
           done
+
+  test_pure_python_wheels:
+    name: Test Pure Python Wheels
+    needs: build_wheels
+    strategy:
+      fail-fast: false   # Don't cancel all jobs if one fails.
+      matrix:
+        python-version: ["3.7", "3.10"]
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Download Wheels
+        uses: actions/download-artifact@v3
+        with:
+          name: python-wheels
+          path: wheels
+      - name: Delete Binary Wheels
+        run: find wheels -type f | grep -v none-any | xargs rm
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Setup Python venv
+        run: |
+          python -m pip install --upgrade pip
+          python -m venv env
+          source env/bin/activate
+          echo "VIRTUAL ENV:" $VIRTUAL_ENV
+      - name: Install Protobuf Wheels
+        run: pip install -vvv --no-index --find-links wheels protobuf protobuftests
+      - name: Run the unit tests
+        run: |
+          TESTS=$(pip show -f protobuftests | grep _test.py | sed 's,/,.,g' | sed -E 's,.py$,,g')
+          for test in $TESTS; do
+            python -m unittest -v $test
+          done

python/dist/BUILD.bazel

@@ -119,9 +119,22 @@ py_wheel(
     deps = [
         ":message_mod",
         ":well_known_proto_py_pb2",
-        #TODO(https://github.com/protocolbuffers/upb/issues/503): currently
+        "@com_google_protobuf//:python_srcs",
-        # this includes the unit tests.  We should filter these out so we are
+    ],
-        # only distributing true source files.
+)
+
+py_wheel(
+    name = "pure_python_wheel",
+    abi = "none",
+    distribution = "protobuf",
+    platform = "any",
+    python_tag = "py3",
+    strip_path_prefixes = [
+        "python/",
+    ],
+    version = PROTOBUF_VERSION,
+    deps = [
+        ":well_known_proto_py_pb2",
         "@com_google_protobuf//:python_srcs",
     ],
 )
@@ -170,5 +183,6 @@ py_dist(
         "osx-aarch_64": "37",
         "osx-x86_64": "37",
     },
+    pure_python_wheel = ":pure_python_wheel",
     tags = ["manual"],
 )

python/dist/dist.bzl

@@ -114,9 +114,11 @@ _py_dist_transition = transition(
 )
 
 def _py_dist_impl(ctx):
+    binary_files = [dep[DefaultInfo].files for dep in ctx.attr.binary_wheel]
+    pure_python_files = [ctx.attr.pure_python_wheel[DefaultInfo].files]
     return [
         DefaultInfo(files = depset(
-            transitive = [dep[DefaultInfo].files for dep in ctx.attr.binary_wheel],
+            transitive = binary_files + pure_python_files,
         )),
     ]
 
@@ -127,6 +129,7 @@ py_dist = rule(
             mandatory = True,
             cfg = _py_dist_transition,
         ),
+        "pure_python_wheel": attr.label(mandatory = True),
         "limited_api_wheels": attr.string_dict(),
         "full_api_versions": attr.string_list(),
         "full_api_cpus": attr.string_list(),