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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import multiprocessing
import os
import pickle
import sys
from concurrent.futures import ProcessPoolExecutor
if sys.version_info < (3, 12):
import importlib_metadata
else:
import importlib.metadata as importlib_metadata
import pytest
import awkward as ak
def has_entry_point():
return bool(importlib_metadata.entry_points(group="awkward.pickle.reduce").names)
pytestmark = pytest.mark.skipif(
has_entry_point(),
reason="Custom pickler is already registered!",
)
def _init_process_with_pickler(pickler_source: str, tmp_path):
# Create custom plugin
(tmp_path / "impl_pickler.py").write_bytes(pickler_source.encode("UTF-8"))
dist_info = tmp_path / "impl_pickler-0.0.0.dist-info"
dist_info.mkdir()
(dist_info / "entry_points.txt").write_bytes(
b"[awkward.pickle.reduce]\nimpl = impl_pickler:plugin\n"
)
sys.path.insert(0, os.fsdecode(tmp_path))
def _pickle_complex_array_and_return_form_impl():
array = ak.Array([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])[[0, 2]]
return pickle.loads(pickle.dumps(array)).layout.form
def pickle_complex_array_and_return_form(pickler_source, tmp_path):
"""Create a new (spawned) process, and register the given pickler source
via entrypoints"""
with ProcessPoolExecutor(
1,
initializer=_init_process_with_pickler,
initargs=(pickler_source, tmp_path),
# Don't fork the current process with all of its state
mp_context=multiprocessing.get_context("spawn"),
) as executor:
pickle_future = executor.submit(_pickle_complex_array_and_return_form_impl)
return pickle_future.result()
def test_default_pickler():
assert _pickle_complex_array_and_return_form_impl() == ak.forms.from_dict(
{"class": "ListOffsetArray", "offsets": "i64", "content": "int64"}
)
def test_noop_pickler(tmp_path):
assert pickle_complex_array_and_return_form(
"""
def plugin(obj, protocol: int):
return NotImplemented""",
tmp_path,
) == ak.forms.from_dict(
{"class": "ListOffsetArray", "offsets": "i64", "content": "int64"}
)
def test_non_packing_pickler(tmp_path):
assert pickle_complex_array_and_return_form(
"""
def plugin(obj, protocol):
import awkward as ak
if isinstance(obj, ak.Array):
form, length, container = ak.to_buffers(obj)
return (
object.__new__,
(ak.Array,),
(form.to_dict(), length, container, obj.behavior),
)
else:
return NotImplemented""",
tmp_path,
) == ak.forms.from_dict(
{"class": "ListArray", "starts": "i64", "stops": "i64", "content": "int64"}
)
def test_malformed_pickler(tmp_path):
with pytest.raises(RuntimeError, match=r"malformed pickler!"):
pickle_complex_array_and_return_form(
"""
def plugin(obj, protocol: int):
raise RuntimeError('malformed pickler!')""",
tmp_path,
)
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