update batch

layercake/layercake/batch.py

@@ -20,8 +20,9 @@ class Status(Enum):
 
 class Result(NamedTuple):
     status: Status
-    cause: Any
-    record: Any
+    input_record: Any
+    output: Any | None = None
+    cause: Any | None = None
 
 
 class BatchProcessor(AbstractContextManager):
@@ -112,7 +113,12 @@ class BatchProcessor(AbstractContextManager):
                 result = self.handler(record)
 
             self.successes.append(record)
-            return Result(Status.SUCCESS, result, record)
+
+            return Result(
+                status=Status.SUCCESS,
+                output=result,
+                input_record=record,
+            )
         except Exception as exc:
             exc_str = f'{type(exc).__name__}: {exc}'
             logger.debug(f'Record processing exception: {exc_str}')
@@ -120,4 +126,8 @@ class BatchProcessor(AbstractContextManager):
             self.exceptions.append(exc)
             self.failures.append(record)
 
-            return Result(Status.FAIL, exc_str, record)
+            return Result(
+                status=Status.FAIL,
+                input_record=record,
+                cause=exc,
+            )