changhe batch

layercake/layercake/batch.py

@@ -2,8 +2,9 @@ import inspect
 import logging
 import os
 from contextlib import AbstractContextManager
+from dataclasses import dataclass
 from enum import Enum
-from typing import Any, Callable, NamedTuple, Self, Sequence
+from typing import Any, Callable, Self, Sequence
 
 LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO').upper()
 
@@ -18,7 +19,8 @@ class Status(Enum):
     FAIL = 'fail'
 
 
-class Result(NamedTuple):
+@dataclass(frozen=True)
+class Result:
     status: Status
     input_record: Any
     output: Any | None = None
@@ -129,5 +131,8 @@ class BatchProcessor(AbstractContextManager):
             return Result(
                 status=Status.FAIL,
                 input_record=record,
-                cause=exc,
+                cause={
+                    'type': type(exc).__name__,
+                    'message': str(exc),
+                },
             )