feat: run bazel build for determined rule (googleapis#14139)

Author: ohmayr

.generator/cli.py

@@ -59,7 +59,7 @@ def _determine_bazel_rule(api_path):
         str: The discovered Bazel rule.
 
     Raises:
-        Exception: If the subprocess call fails or returns an empty result.
+        ValueError: If the subprocess call fails or returns an empty result.
     """
     logger.info(f"Determining Bazel rule for api_path: '{api_path}'")
     try:
@@ -82,6 +82,30 @@ def _determine_bazel_rule(api_path):
         raise ValueError(f"Bazelisk query `{query}` failed") from e
 
 
+def _build_bazel_target(bazel_rule):
+    """Executes `bazelisk build` on a given Bazel rule.
+
+    Args:
+        bazel_rule (str): The Bazel rule to build.
+
+    Raises:
+        ValueError: If the subprocess call fails.
+    """
+    logger.info(f"Executing build for rule: {bazel_rule}")
+    try:
+        command = ["bazelisk", "build", bazel_rule]
+        subprocess.run(
+            command,
+            cwd=f"{SOURCE_DIR}/googleapis",
+            capture_output=True,
+            text=True,
+            check=True,
+        )
+        logger.info(f"Bazel build for {bazel_rule} rule completed successfully.")
+    except Exception as e:
+        raise ValueError(f"Bazel build for {bazel_rule} rule failed.") from e
+
+
 def handle_generate():
     """The main coordinator for the code generation process.
 
@@ -104,6 +128,7 @@ def handle_generate():
             api_path = api.get("path")
             if api_path:
                 bazel_rule = _determine_bazel_rule(api_path)
+                _build_bazel_target(bazel_rule)
 
             logger.info(json.dumps(request_data, indent=2))
     except Exception as e:

.generator/test_cli.py

@@ -23,6 +23,7 @@
 from cli import (
     _read_json_file,
     _determine_bazel_rule,
+    _build_bazel_target,
     handle_generate,
     handle_build,
     handle_configure,
@@ -78,6 +79,29 @@ def test_determine_bazel_rule_success(mocker, caplog):
     assert "Found Bazel rule" in caplog.text
 
 
+def test_build_bazel_target_success(mocker, caplog):
+    """
+    Tests that the build helper logs success when the command runs correctly.
+    """
+    caplog.set_level(logging.INFO)
+    mocker.patch("cli.subprocess.run", return_value=MagicMock(returncode=0))
+    _build_bazel_target("mock/bazel:rule")
+    assert "Bazel build for mock/bazel:rule rule completed successfully" in caplog.text
+
+
+def test_build_bazel_target_fails(mocker, caplog):
+    """
+    Tests that ValueError is raised if the subprocess command fails.
+    """
+    caplog.set_level(logging.ERROR)
+    mocker.patch(
+        "cli.subprocess.run",
+        side_effect=subprocess.CalledProcessError(1, "cmd", stderr="Build failed"),
+    )
+    with pytest.raises(ValueError):
+        _build_bazel_target("mock/bazel:rule")
+
+
 def test_determine_bazel_rule_command_fails(mocker, caplog):
     """
     Tests that an exception is raised if the subprocess command fails.
@@ -103,6 +127,7 @@ def test_handle_generate_success(caplog, mock_generate_request_file, mocker):
     mock_determine_rule = mocker.patch(
         "cli._determine_bazel_rule", return_value="mock-rule"
     )
+    mock_build_target = mocker.patch("cli._build_bazel_target")
 
     handle_generate()