wehub-resource-sync
119 lines
3.8 KiB
Python
119 lines
3.8 KiB
Python
# Copyright 2026 Emcie Co Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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import asyncio
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import pytest
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from parlant.core.async_utils import (
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CancellationSuppressionLatch,
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latched_shield,
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)
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async def test_latch_behavior_with_no_cancellation() -> None:
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"""Test latch behavior when task is cancelled but latch suppresses it."""
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execution_log = []
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async def shielded_task(suppression_latch: CancellationSuppressionLatch[str]) -> str:
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execution_log.append("started")
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suppression_latch.enable()
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await asyncio.sleep(0.1) # Simulate some work
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execution_log.append("finished")
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return "done"
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async def test_task() -> str:
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return await latched_shield(shielded_task)
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t = asyncio.create_task(test_task())
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assert (await t) == "done"
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# When latch is enabled and cancellation is suppressed, ALL code should execute
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assert execution_log == ["started", "finished"]
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async def test_latch_behavior_with_cancellation_after_suppression() -> None:
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"""Test latch behavior when task is cancelled but latch suppresses it."""
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ready_to_cancel = asyncio.Event()
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cancelled = asyncio.Event()
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execution_log = []
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async def shielded_task(suppression_latch: CancellationSuppressionLatch[None]) -> None:
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execution_log.append("started")
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suppression_latch.enable()
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ready_to_cancel.set() # Trigger cancellation suppression
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await cancelled.wait()
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await asyncio.sleep(0.1) # Simulate some work
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execution_log.append("finished")
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async def test_task() -> None:
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await latched_shield(shielded_task)
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t = asyncio.create_task(test_task())
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# Wait for shielded task to start
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await ready_to_cancel.wait()
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# Cancel it
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t.cancel()
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cancelled.set()
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# Wait for task to complete
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await t
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# When latch is enabled and cancellation is suppressed, ALL code should execute
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assert execution_log == ["started", "finished"]
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async def test_latch_behavior_with_cancellation_before_suppression() -> None:
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"""Test latch behavior when task is cancelled but latch suppresses it."""
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ready_to_cancel = asyncio.Event()
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cancelled = asyncio.Event()
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cancellation_raised_at_expected_point = False
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execution_log = []
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async def shielded_task(suppression_latch: CancellationSuppressionLatch[None]) -> None:
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nonlocal cancellation_raised_at_expected_point
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execution_log.append("started")
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try:
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ready_to_cancel.set() # Trigger cancellation suppression
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await cancelled.wait()
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except asyncio.CancelledError:
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cancellation_raised_at_expected_point = True
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raise
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suppression_latch.enable()
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await asyncio.sleep(0.1) # Simulate some work
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execution_log.append("finished")
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async def test_task() -> None:
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await latched_shield(shielded_task)
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t = asyncio.create_task(test_task())
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# Wait for shielded task to start
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await ready_to_cancel.wait()
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# Cancel it
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t.cancel()
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cancelled.set()
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# Wait for task to complete
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with pytest.raises(asyncio.CancelledError):
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await t
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# When latch is enabled and cancellation is suppressed, ALL code should execute
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assert execution_log == ["started"]
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assert cancellation_raised_at_expected_point
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