Use dill instead of pickle for processing .pkl files (#354)

* use dill instead of pickle for file processor

* add unittest for pickle processor

* relock

* fix unittest

* fmt

* rename dill

* relock

* relock with poetry 1.8.2

* relock

* lock

* fmt

* relock

---------

Co-authored-by: yutaro-oguri <yutaro-oguri@m3.com>

gokart/file_processor.py

@@ -1,10 +1,10 @@
 import os
-import pickle
 import xml.etree.ElementTree as ET
 from abc import abstractmethod
 from io import BytesIO
 from logging import getLogger
 
+import dill
 import luigi
 import luigi.contrib.s3
 import luigi.format
@@ -82,11 +82,11 @@ def format(self):
 
     def load(self, file):
         if not ObjectStorage.is_buffered_reader(file):
-            return pickle.loads(file.read())
-        return pickle.load(_ChunkedLargeFileReader(file))
+            return dill.loads(file.read())
+        return dill.load(_ChunkedLargeFileReader(file))
 
     def dump(self, obj, file):
-        self._write(pickle.dumps(obj, protocol=4), file)
+        self._write(dill.dumps(obj, protocol=4), file)
 
     @staticmethod
     def _write(buffer, file):

pyproject.toml

@@ -29,6 +29,7 @@ uritemplate = "*"
 google-api-python-client = "*"
 APScheduler = "*"
 redis = "*"
+dill = "*"
 backoff = "^2.2.1"
 
 [tool.poetry.group.dev.dependencies]

test/test_file_processor.py

@@ -1,10 +1,11 @@
 import tempfile
 import unittest
+from typing import Callable
 
 import pandas as pd
 from luigi import LocalTarget
 
-from gokart.file_processor import CsvFileProcessor, FeatherFileProcessor
+from gokart.file_processor import CsvFileProcessor, FeatherFileProcessor, PickleFileProcessor
 
 
 class TestCsvFileProcessor(unittest.TestCase):
@@ -67,6 +68,54 @@ def test_load_csv_with_cp932(self):
                 pd.testing.assert_frame_equal(df, loaded_df)
 
 
+class TestPickleFileProcessor(unittest.TestCase):
+    def test_dump_and_load_normal_obj(self):
+        var = 'abc'
+        processor = PickleFileProcessor()
+
+        with tempfile.TemporaryDirectory() as temp_dir:
+            temp_path = f'{temp_dir}/temp.pkl'
+            local_target = LocalTarget(path=temp_path, format=processor.format())
+            with local_target.open('w') as f:
+                processor.dump(var, f)
+            with local_target.open('r') as f:
+                loaded = processor.load(f)
+
+        self.assertEqual(loaded, var)
+
+    def test_dump_and_load_class(self):
+        import functools
+
+        def plus1(func: Callable[[], int]) -> Callable[[], int]:
+            @functools.wraps(func)
+            def wrapped() -> int:
+                ret = func()
+                return ret + 1
+
+            return wrapped
+
+        class A:
+            run: Callable[[], int]
+
+            def __init__(self) -> None:
+                self.run = plus1(self.run)
+
+            def run(self) -> int:
+                return 1
+
+        obj = A()
+        processor = PickleFileProcessor()
+        with tempfile.TemporaryDirectory() as temp_dir:
+            temp_path = f'{temp_dir}/temp.pkl'
+            local_target = LocalTarget(path=temp_path, format=processor.format())
+            with local_target.open('w') as f:
+                processor.dump(obj, f)
+            with local_target.open('r') as f:
+                loaded = processor.load(f)
+
+        self.assertEqual(loaded.run(), obj.run())
+
+
 class TestFeatherFileProcessor(unittest.TestCase):
     def test_feather_should_return_same_dataframe(self):
         df = pd.DataFrame({'a': [1]})