Fix 'UnaryUnaryCall' object has no attribute 'exception' error in async requests (#1061)

Author: Dumeng

google/ads/googleads/interceptors/exception_interceptor.py

@@ -159,8 +159,8 @@ def __await__(self):
                 return response
             else:
                 return util.convert_proto_plus_to_protobuf(response)
-        except grpc.RpcError:
-            yield from self._interceptor._handle_grpc_failure_async(self._call).__await__()
+        except grpc.RpcError as exception:
+            yield from self._interceptor._handle_grpc_failure_async(self._call, exception).__await__()
             raise
 
     def cancel(self):
@@ -209,8 +209,8 @@ async def _wrapped_aiter():
                         yield response
                     else:
                         yield util.convert_proto_plus_to_protobuf(response)
-            except grpc.RpcError:
-                await self._interceptor._handle_grpc_failure_async(self._call)
+            except grpc.RpcError as exception:
+                await self._interceptor._handle_grpc_failure_async(self._call, exception)
                 raise
         return _wrapped_aiter()
 
@@ -252,19 +252,30 @@ async def read(self):
                 return response
             else:
                 return util.convert_proto_plus_to_protobuf(response)
-        except grpc.RpcError:
-            await self._interceptor._handle_grpc_failure_async(self._call)
+        except grpc.RpcError as exception:
+            await self._interceptor._handle_grpc_failure_async(self._call, exception)
             raise
 
-class _AsyncExceptionInterceptor(
-    ExceptionInterceptor,
-):
+class _AsyncExceptionInterceptor(Interceptor, grpc.aio.UnaryUnaryClientInterceptor, grpc.aio.UnaryStreamClientInterceptor,):
     """An interceptor that wraps rpc exceptions."""
 
-    async def _handle_grpc_failure_async(self, response: grpc.aio.Call):
+    def __init__(self, api_version: str, use_proto_plus: bool = False):
+        """Initializes the ExceptionInterceptor.
+
+        Args:
+            api_version: a str of the API version of the request.
+            use_proto_plus: a boolean of whether returned messages should be
+                proto_plus or protobuf.
+        """
+        super().__init__(api_version)
+        self._api_version = api_version
+        self._use_proto_plus = use_proto_plus
+
+    async def _handle_grpc_failure_async(self, response: grpc.aio.Call, exception: grpc.RpcError):
         """Async version of _handle_grpc_failure."""
-        status_code = response.code()
-        response_exception = response.exception()
+        status_code = await response.code()
+        
+        response_exception = exception
 
         # We need to access _RETRY_STATUS_CODES from interceptor module?
         # It's imported in interceptor.py but not exposed in ExceptionInterceptor?
@@ -300,7 +311,7 @@ async def _handle_grpc_failure_async(self, response: grpc.aio.Call):
             raise response_exception
 
         # If we got here, maybe no exception? But we only call this on error.
-        raise response.exception()
+        raise response_exception
 
     async def intercept_unary_unary(
         self,

google/ads/googleads/interceptors/logging_interceptor.py

@@ -468,10 +468,13 @@ async def _log_request_async(
         # Since this is called in on_done, it is done.
 
         try:
-            # This might raise if cancelled?
-            exception = response.exception()
-        except Exception:
-             exception = None
+            if hasattr(response, "exception"):
+                exception = response.code()
+            else:
+                await response.code()
+                exception = None
+        except Exception as ex:
+             exception = ex
 
         if exception:
             # We need to adapt exception logging for async exception?

tests/interceptors/exception_interceptor_test.py

@@ -361,7 +361,7 @@ async def test_handle_grpc_failure(self):
         mock_error_message = _MOCK_FAILURE_VALUE
 
         class MockRpcErrorResponse(grpc.RpcError):
-            def code(self):
+            async def code(self):
                 return grpc.StatusCode.INVALID_ARGUMENT
 
             async def trailing_metadata(self):
@@ -373,13 +373,16 @@ def exception(self):
         interceptor = self._create_test_interceptor()
 
         with self.assertRaises(GoogleAdsException):
-            await interceptor._handle_grpc_failure_async(MockRpcErrorResponse())
+            error_response = MockRpcErrorResponse()
+            await interceptor._handle_grpc_failure_async(
+                error_response, error_response
+            )
 
     async def test_handle_grpc_failure_retryable(self):
         """Raises retryable exceptions as-is."""
 
         class MockRpcErrorResponse(grpc.RpcError):
-            def code(self):
+            async def code(self):
                 return grpc.StatusCode.INTERNAL
 
             def exception(self):
@@ -388,13 +391,16 @@ def exception(self):
         interceptor = self._create_test_interceptor()
 
         with self.assertRaises(MockRpcErrorResponse):
-            await interceptor._handle_grpc_failure_async(MockRpcErrorResponse())
+            error_response = MockRpcErrorResponse()
+            await interceptor._handle_grpc_failure_async(
+                error_response, error_response
+            )
 
     async def test_handle_grpc_failure_not_google_ads_failure(self):
         """Raises as-is non-retryable non-GoogleAdsFailure exceptions."""
 
         class MockRpcErrorResponse(grpc.RpcError):
-            def code(self):
+            async def code(self):
                 return grpc.StatusCode.INVALID_ARGUMENT
 
             async def trailing_metadata(self):
@@ -406,7 +412,10 @@ def exception(self):
         interceptor = self._create_test_interceptor()
 
         with self.assertRaises(MockRpcErrorResponse):
-            await interceptor._handle_grpc_failure_async(MockRpcErrorResponse())
+            error_response = MockRpcErrorResponse()
+            await interceptor._handle_grpc_failure_async(
+                error_response, error_response
+            )
 
     async def test_intercept_unary_unary_response_is_exception(self):
         """If response.exception() is not None exception is handled."""
@@ -439,7 +448,7 @@ async def mock_continuation(client_call_details, request):
             except grpc.RpcError:
                 pass
 
-            mock_handle.assert_called_once_with(mock_call)
+            mock_handle.assert_called_once_with(mock_call, mock_exception)
 
     async def test_intercept_unary_stream_response_is_exception(self):
         """Ensure errors raised from response iteration are handled/wrapped."""
@@ -470,21 +479,15 @@ async def mock_continuation(client_call_details, request):
                 mock_continuation, mock_client_call_details, mock_request
             )
 
-            # Ensure the returned value is a wrapped response object.
             self.assertIsInstance(response, _AsyncUnaryStreamCallWrapper)
 
-            # Initiate an iteration of the wrapped response object
             try:
                 async for _ in response:
-                    # This loop body should not be entered because the exception
-                    # is raised on the first attempt to get an item.
                     pass
             except grpc.RpcError:
                 pass
 
-            # Check that the error handler method on the interceptor instance
-            # was called as a result of the iteration.
-            mock_handle.assert_called_once_with(mock_call)
+            mock_handle.assert_called_once_with(mock_call, mock_exception)
 
     async def test_intercept_unary_unary_response_is_successful(self):
         """If response.exception() is None response is returned."""
@@ -625,7 +628,9 @@ async def mock_continuation(client_call_details, request):
             found = True
             break  # We only need the first item
 
-        self.assertTrue(found, "Iterator should have yielded at least one message")
+        self.assertTrue(
+            found, "Iterator should have yielded at least one message"
+        )
         self.assertIsInstance(message, proto.Message)
 
     async def test_intercept_unary_stream_protobuf_proto(self):
@@ -661,5 +666,7 @@ async def mock_continuation(client_call_details, request):
             found = True
             break  # We only need the first item
 
-        self.assertTrue(found, "Iterator should have yielded at least one message")
+        self.assertTrue(
+            found, "Iterator should have yielded at least one message"
+        )
         self.assertIsInstance(message, ProtobufMessageType)

tests/interceptors/logging_interceptor_test.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 """Tests for the Logging gRPC Interceptor."""
 
-
 from importlib import import_module
 import json
 import logging
@@ -32,7 +31,6 @@
 import google.ads.googleads.interceptors.logging_interceptor as interceptor_module
 from google.ads.googleads import util
 
-
 default_version = Client._DEFAULT_VERSION
 module_prefix = f"google.ads.googleads.{default_version}"
 
@@ -60,7 +58,6 @@
 )
 
 
-
 class AwaitableMagicMock(mock.MagicMock):
     def __await__(self):
         return self._await_impl().__await__()
@@ -937,7 +934,9 @@ def _create_test_interceptor(
         if not version:
             version = default_version
 
-        return interceptor_module._AsyncLoggingInterceptor(logger, version, endpoint)
+        return interceptor_module._AsyncLoggingInterceptor(
+            logger, version, endpoint
+        )
 
     def _get_mock_client_call_details(self):
         mock_client_call_details = mock.Mock()
@@ -970,39 +969,41 @@ def _get_mock_exception(self):
     def _get_mock_response(self, failed=False, streaming=False):
         mock_response = AwaitableMagicMock()
 
-        # Async trailing_metadata
         async def mock_trailing_metadata():
             return self._MOCK_TRAILING_METADATA
+
         mock_response.trailing_metadata = mock_trailing_metadata
 
-        # Sync exception
-        def mock_exception_fn():
-            if failed:
+        if failed:
+
+            def mock_exception_fn():
                 return self._get_mock_exception()
-            return None
-        mock_response.exception = mock_exception_fn
 
-        # Async await for UnaryUnary
+            mock_response.exception = mock_exception_fn
+            mock_response.code = lambda: self._get_mock_exception()
+        else:
+            del mock_response.exception
+
+            async def mock_code():
+                return 0
+
+            mock_response.code = mock_code
+
         async def get_result():
             if streaming:
                 return self._MOCK_STREAM
             return self._MOCK_RESPONSE_MSG
 
         mock_response._await_impl = get_result
 
-        # For streaming, we might need 'read' attribute to distinguish
         if streaming:
             mock_response.read = mock.AsyncMock(return_value=self._MOCK_STREAM)
         else:
             del mock_response.read
 
         del mock_response.result
 
-        # Sync add_done_callback
         def mock_add_done_callback(fn):
-            # In async interceptor, this is called to register the logging task.
-            # We want to execute it immediately or schedule it.
-            # Since fn expects a future (the call), and mock_response is the call.
             fn(mock_response)
 
         mock_response.add_done_callback = mock_add_done_callback
@@ -1013,6 +1014,7 @@ def _get_mock_continuation_fn(self, fail=False):
         async def mock_continuation_fn(*args):
             mock_response = self._get_mock_response(fail)
             return mock_response
+
         return mock_continuation_fn
 
     async def test_intercept_unary_unary_unconfigured(self):
@@ -1058,7 +1060,9 @@ async def test_intercept_unary_unary_successful_request(self):
         mock_request = self._get_mock_request()
 
         # We need to get the response to assert against it
-        mock_response = await mock_continuation_fn(mock_client_call_details, mock_request)
+        mock_response = await mock_continuation_fn(
+            mock_client_call_details, mock_request
+        )
         mock_trailing_metadata = await mock_response.trailing_metadata()
 
         with (
@@ -1156,7 +1160,7 @@ async def mock_continuation_fn(*args):
                     initial_metadata,
                     mock_request,
                     trailing_metadata,
-                    None, # Result is None for stream in async interceptor
+                    None,  # Result is None for stream in async interceptor
                 )
             )