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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import annotations
import multiprocessing
import typing
from unittest import TestCase
from unittest import mock
import pytest
import cotyledon
from cotyledon import _utils
P = typing.ParamSpec("P")
R = typing.TypeVar("R")
class FakeService(cotyledon.Service):
pass
class SomeTest(TestCase):
def setUp(self) -> None:
super().setUp()
cotyledon.ServiceManager._process_runner_already_created = False
def test_forking_slowdown(self) -> None:
sm = cotyledon.ServiceManager()
sm.add(FakeService, workers=3)
with mock.patch("time.sleep") as sleep:
sm._slowdown_respawn_if_needed()
sm._slowdown_respawn_if_needed()
sm._slowdown_respawn_if_needed()
# We simulatge 3 more spawn
sm._slowdown_respawn_if_needed()
sm._slowdown_respawn_if_needed()
sm._slowdown_respawn_if_needed()
assert len(sleep.mock_calls) == 6
def test_invalid_service(self) -> None:
sm = cotyledon.ServiceManager()
self.assert_raises_msg(
TypeError,
"'service' must be a callable",
sm.add,
"foo", # type: ignore[arg-type]
)
self.assert_raises_msg(
ValueError,
"'workers' must be an int >= 1, not: None (NoneType)",
sm.add,
FakeService,
workers=None, # type: ignore[arg-type]
)
self.assert_raises_msg(
ValueError,
"'workers' must be an int >= 1, not: -2 (int)",
sm.add,
FakeService,
workers=-2,
)
oid = sm.add(FakeService, workers=3)
self.assert_raises_msg(
ValueError,
"'workers' must be an int >= -2, not: -5 (int)",
sm.reconfigure,
oid,
workers=-5,
)
self.assert_raises_msg(
ValueError,
"notexists service id doesn't exists",
sm.reconfigure,
"notexists", # type: ignore[arg-type]
workers=-1,
)
@staticmethod
def assert_raises_msg(
exc: type[Exception] | tuple[type[Exception], ...],
msg: str,
func: typing.Callable[P, R],
*args: P.args,
**kwargs: P.kwargs,
) -> None:
with pytest.raises(exc) as exc_info:
func(*args, **kwargs)
assert msg == str(exc_info.value)
class TestMultiprocessing(TestCase):
def setUp(self) -> None:
super().setUp()
cotyledon.ServiceManager._process_runner_already_created = False
def test_multiprocessing_context_default(self) -> None:
"""Test that ServiceManager uses multiprocessing (fork) by default"""
sm = cotyledon.ServiceManager()
# Default should be multiprocessing context (fork-compatible)
assert sm.mp_context == multiprocessing.get_context()
def test_multiprocessing_context_constructor(self) -> None:
"""Test that mp_context parameter in constructor works"""
spawn_ctx = multiprocessing.get_context("spawn")
sm = cotyledon.ServiceManager(mp_context=spawn_ctx)
assert sm.mp_context is spawn_ctx
def test_spawn_process_with_context(self) -> None:
"""Test that spawn_process uses the provided context"""
def dummy_target() -> None:
pass
# Test with default context (None)
mock_proc_instance = mock.Mock()
mock_proc_instance.start = mock.Mock()
with mock.patch(
"multiprocessing.Process",
return_value=mock_proc_instance,
) as mock_process:
_utils.spawn_process(dummy_target)
# Should use multiprocessing.Process
mock_process.assert_called_once()
mock_proc_instance.start.assert_called_once()
# Test with explicit context
spawn_ctx = multiprocessing.get_context("spawn")
mock_ctx_proc_instance = mock.Mock()
mock_ctx_proc_instance.start = mock.Mock()
with mock.patch.object(
spawn_ctx,
"Process",
return_value=mock_ctx_proc_instance,
) as mock_ctx_process:
_utils.spawn_process(dummy_target, ctx=spawn_ctx)
# Should use ctx.Process
mock_ctx_process.assert_called_once()
mock_ctx_proc_instance.start.assert_called_once()
def test_spawn_process_backward_compatible(self) -> None:
"""Test that spawn_process without ctx is backward compatible"""
def dummy_target() -> None:
pass
# When ctx is None, should default to multiprocessing
mock_proc_instance = mock.Mock()
mock_proc_instance.start = mock.Mock()
with mock.patch(
"multiprocessing.Process",
return_value=mock_proc_instance,
) as mock_process:
_utils.spawn_process(dummy_target, ctx=None)
mock_process.assert_called_once()
mock_proc_instance.start.assert_called_once()
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