fix(huaweicloud): preserve FunctionGraph region attribution

- Carry regional client keys through function discovery
- Cover regionless SDK clients with a regression test
- Document FunctionGraph initialization behavior

prowler/providers/huaweicloud/services/functiongraph/functiongraph_service.py

@@ -15,6 +15,11 @@ class FunctionGraph(HuaweiCloudService):
     """
 
     def __init__(self, provider):
+        """Initialize FunctionGraph and discover functions in enabled regions.
+
+        Args:
+            provider: The Huawei Cloud provider used to create regional clients.
+        """
         super().__init__(__class__.__name__, provider)
 
         self.functions: List[FunctionGraphFunction] = []
@@ -23,7 +28,9 @@ class FunctionGraph(HuaweiCloudService):
             self._load_mock_data()
             return
 
-        self.__threading_call__(self._list_functions)
+        self.__threading_call__(
+            self._list_functions, iterator=self.regional_clients.items()
+        )
 
     def _load_mock_data(self):
         """Load mock data for testing."""
@@ -51,9 +58,9 @@ class FunctionGraph(HuaweiCloudService):
             ),
         ]
 
-    def _list_functions(self, regional_client):
+    def _list_functions(self, regional_client_item):
         """List every FunctionGraph function in one region."""
-        region = getattr(regional_client, "region", "unknown")
+        region, regional_client = regional_client_item
         logger.info(f"FunctionGraph - Listing Functions in {region}...")
         discovered_functions = []
         marker = None

tests/providers/huaweicloud/services/functiongraph/huaweicloud_functiongraph_service_test.py

@@ -11,9 +11,18 @@ from tests.providers.huaweicloud.huaweicloud_fixtures import (
 
 class TestFunctionGraphService:
     def test_real_session_lists_functions(self):
-        regional_client = mock.MagicMock(region="eu-west-101")
+        function = SimpleNamespace(
+            resource_id="resource-1",
+            func_urn="urn:fss:eu-west-101:project-1:function:default:first:latest",
+            func_name="first",
+            runtime="Python3.9",
+            timeout=30,
+            memory_size=128,
+            func_vpc_id=None,
+        )
+        regional_client = SimpleNamespace(list_functions=mock.MagicMock())
         regional_client.list_functions.return_value = SimpleNamespace(
-            functions=[], next_marker=None
+            functions=[function], next_marker=None
         )
         provider = set_mocked_huaweicloud_provider()
         provider.session = SimpleNamespace(client=mock.MagicMock())
@@ -24,7 +33,8 @@ class TestFunctionGraphService:
 
         service = FunctionGraph(provider)
 
-        assert service.functions == []
+        assert len(service.functions) == 1
+        assert service.functions[0].region == "eu-west-101"
         regional_client.list_functions.assert_called_once()
 
     def test_lists_every_page_and_maps_sdk_fields(self):
@@ -58,7 +68,7 @@ class TestFunctionGraphService:
             side_effect=regional_client.list_functions.side_effect
         )
 
-        service._list_functions(regional_client)
+        service._list_functions(("eu-west-101", regional_client))
 
         assert [function.id for function in service.functions] == [
             "resource-1",
@@ -98,7 +108,7 @@ class TestFunctionGraphService:
             ]
         )
 
-        service._list_functions(regional_client)
+        service._list_functions(("eu-west-101", regional_client))
 
         assert service.functions == []
 
@@ -123,7 +133,7 @@ class TestFunctionGraphService:
             ]
         )
 
-        service._list_functions(regional_client)
+        service._list_functions(("eu-west-101", regional_client))
 
         assert [item.id for item in service.functions] == ["resource-1"]
         assert service._call_with_retries.call_count == 2