feat: Add support for reading ClientLibrarySettings from service configuration YAML

Author: parthea

gapic/schema/api.py

@@ -670,6 +670,26 @@ def enforce_valid_method_settings(
         if all_errors:
             raise MethodSettingsError(yaml.dump(all_errors))
 
+    @cached_property
+    def all_library_settings(
+        self,
+    ) -> Mapping[str, Sequence[client_pb2.ClientLibrarySettings]]:
+        """Return a map of all `google.api.client.ClientLibrarySettings` to be used
+        when generating client libraries.
+        https://github.com/googleapis/googleapis/blob/master/google/api/client.proto#L130
+
+        Return:
+            Mapping[str, Sequence[client_pb2.ClientLibrarySettings]]: A mapping of all library
+                settings read from the service YAML.
+        """
+        return {
+            library_setting.version: client_pb2.ClientLibrarySettings(
+                version=library_setting.version,
+                python_settings=library_setting.python_settings,
+            )
+            for library_setting in self.service_yaml_config.publishing.library_settings
+        }
+
     @cached_property
     def all_method_settings(self) -> Mapping[str, Sequence[client_pb2.MethodSettings]]:
         """Return a map of all `google.api.client.MethodSettings` to be used

tests/unit/schema/test_api.py

@@ -2695,6 +2695,33 @@ def test_api_all_methods():
     ]
 
 
+def test_read_python_settings_from_service_yaml():
+    service_yaml_config = {
+        "apis": [
+            {"name": "google.example.v1beta1.ServiceOne.Example1"},
+        ],
+        "publishing": {
+            "library_settings": [
+                {
+                    "version": "google.example.v1beta1",
+                    "python_settings": {
+                        "optional_features": ["rest_aio"],
+                    },
+                }
+            ]
+        },
+    }
+    cli_options = Options(service_yaml_config=service_yaml_config)
+    fd = get_file_descriptor_proto_for_method_settings_tests(fields=[])
+    api_schema = api.API.build(fd, "google.example.v1beta1", opts=cli_options)
+    assert api_schema.all_library_settings == {
+        "google.example.v1beta1": client_pb2.ClientLibrarySettings(
+            version="google.example.v1beta1",
+            python_settings=client_pb2.PythonSettings(optional_features=["rest_aio"]),
+        )
+    }
+
+
 def test_read_method_settings_from_service_yaml():
     """
     Tests the `gapic.schema.api.all_method_settings` method which reads