fix: on_operation hooks unable to modify result on error. (#3629)

* fix: on_operation hooks unable to modify result on error.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add release file

* Fix issue preventing extensions from receiving result in async execution context

* delegate missing query error

* use the previous catch mechanism

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* cherrypick execution logic for the mask error extension

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* ugly fix for assuring process errors is called exactly once.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Patrick Arminio <patrick.arminio@gmail.com>

RELEASE.md

@@ -0,0 +1,4 @@
+Release type: patch
+
+This release fixes an issue that prevented extensions to receive the result from
+the execution context when executing operations in async.

strawberry/schema/execute.py

@@ -123,18 +123,14 @@ async def _handle_execution_result(
     context: ExecutionContext,
     result: Union[GraphQLExecutionResult, ExecutionResult],
     extensions_runner: SchemaExtensionsRunner,
-    process_errors: ProcessErrors,
+    process_errors: ProcessErrors | None,
 ) -> ExecutionResult:
     # Set errors on the context so that it's easier
     # to access in extensions
     if result.errors:
         context.errors = result.errors
-
-        # Run the `Schema.process_errors` function here before
-        # extensions have a chance to modify them (see the MaskErrors
-        # extension). That way we can log the original errors but
-        # only return a sanitised version to the client.
-        process_errors(result.errors, context)
+        if process_errors:
+            process_errors(result.errors, context)
     if isinstance(result, GraphQLExecutionResult):
         result = ExecutionResult(data=result.data, errors=result.errors)
     result.extensions = await extensions_runner.get_extensions_results(context)
@@ -171,7 +167,7 @@ async def execute(
             assert execution_context.graphql_document
             async with extensions_runner.executing():
                 if not execution_context.result:
-                    res = await await_maybe(
+                    result = await await_maybe(
                         original_execute(
                             schema,
                             execution_context.graphql_document,
@@ -183,9 +179,20 @@ async def execute(
                             execution_context_class=execution_context_class,
                         )
                     )
-
+                    execution_context.result = result
                 else:
-                    res = execution_context.result
+                    result = execution_context.result
+                # Also set errors on the execution_context so that it's easier
+                # to access in extensions
+                if result.errors:
+                    execution_context.errors = result.errors
+
+                    # Run the `Schema.process_errors` function here before
+                    # extensions have a chance to modify them (see the MaskErrors
+                    # extension). That way we can log the original errors but
+                    # only return a sanitised version to the client.
+                    process_errors(result.errors, execution_context)
+
     except (MissingQueryError, InvalidOperationTypeError) as e:
         raise e
     except Exception as exc:
@@ -195,10 +202,9 @@ async def execute(
             extensions_runner,
             process_errors,
         )
-
     # return results after all the operation completed.
     return await _handle_execution_result(
-        execution_context, res, extensions_runner, process_errors
+        execution_context, result, extensions_runner, None
     )
 
 

tests/schema/extensions/test_mask_errors.py

@@ -29,6 +29,29 @@ def hidden_error(self) -> str:
     ]
 
 
+async def test_mask_all_errors_async():
+    @strawberry.type
+    class Query:
+        @strawberry.field
+        def hidden_error(self) -> str:
+            raise KeyError("This error is not visible")
+
+    schema = strawberry.Schema(query=Query, extensions=[MaskErrors()])
+
+    query = "query { hiddenError }"
+
+    result = await schema.execute(query)
+    assert result.errors is not None
+    formatted_errors = [err.formatted for err in result.errors]
+    assert formatted_errors == [
+        {
+            "locations": [{"column": 9, "line": 1}],
+            "message": "Unexpected error.",
+            "path": ["hiddenError"],
+        }
+    ]
+
+
 def test_mask_some_errors():
     class VisibleError(Exception):
         pass