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import asyncio
import gc
import logging
from functools import partial
from unittest import mock
import pytest
from async_lru import _CacheItem, _LRUCacheWrapper
async def test_done_callback_cancelled() -> None:
wrapped = _LRUCacheWrapper(mock.ANY, None, False, None)
loop = asyncio.get_running_loop()
task = loop.create_future()
key = 1
task.add_done_callback(partial(wrapped._task_done_callback, key))
task.cancel()
await asyncio.sleep(0)
assert task not in wrapped._LRUCacheWrapper__tasks # type: ignore[attr-defined]
async def test_done_callback_exception() -> None:
wrapped = _LRUCacheWrapper(mock.ANY, None, False, None)
loop = asyncio.get_running_loop()
task = loop.create_future()
key = 1
task.add_done_callback(partial(wrapped._task_done_callback, key))
exc = ZeroDivisionError()
task.set_exception(exc)
await asyncio.sleep(0)
assert task not in wrapped._LRUCacheWrapper__tasks # type: ignore[attr-defined]
async def test_done_callback_exception_logs(caplog: pytest.LogCaptureFixture) -> None:
caplog.set_level(logging.ERROR, logger="asyncio")
wrapped = _LRUCacheWrapper(mock.ANY, None, False, None)
loop = asyncio.get_running_loop()
async def boom() -> None:
await asyncio.sleep(0)
raise RuntimeError("boom")
key = object()
task = loop.create_task(boom())
wrapped._LRUCacheWrapper__cache[key] = _CacheItem(task, None, 1) # type: ignore[attr-defined]
task.add_done_callback(partial(wrapped._task_done_callback, key))
while not task.done():
await asyncio.sleep(0)
await asyncio.sleep(0)
assert key not in wrapped._LRUCacheWrapper__cache # type: ignore[attr-defined]
# asyncio disables logging when exception() is called; keep logging enabled.
assert task._log_traceback
caplog.clear()
del task # Remove reference so task get garbage collected.
for _ in range(5): # pragma: no branch
gc.collect()
await asyncio.sleep(0)
if "Task exception was never retrieved" in caplog.text: # pragma: no branch
break
assert "Task exception was never retrieved" in caplog.text
assert "RuntimeError: boom" in caplog.text
async def test_cache_invalidate_typed() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, True, None)
from_cache = wrapped.cache_invalidate(1, a=1)
assert not from_cache
await wrapped(1, a=1)
from_cache = wrapped.cache_invalidate(1, a=1)
assert from_cache
assert wrapped.cache_info().currsize == 0
from_cache = wrapped.cache_invalidate(1.0, a=1)
assert not from_cache
assert wrapped.cache_info().currsize == 0
await wrapped(1.0, a=1)
assert wrapped.cache_info().currsize == 1
from_cache = wrapped.cache_invalidate(1.0, a=1)
assert from_cache
async def test_cache_invalidate_not_typed() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, False, None)
from_cache = wrapped.cache_invalidate(1, a=1)
assert not from_cache
await wrapped(1, a=1)
assert wrapped.cache_info().currsize == 1
from_cache = wrapped.cache_invalidate(1, a=1)
assert from_cache
assert wrapped.cache_info().currsize == 0
await wrapped(1, a=1)
assert wrapped.cache_info().currsize == 1
from_cache = wrapped.cache_invalidate(1.0, a=1)
assert from_cache
assert wrapped.cache_info().currsize == 0
async def test_cache_clear() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, True, None)
await wrapped(123)
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 1
assert wrapped.cache_info().currsize == 1
assert wrapped.cache_parameters()["tasks"] == 0
await wrapped(123)
assert wrapped.cache_info().hits == 1
assert wrapped.cache_info().misses == 1
assert wrapped.cache_info().currsize == 1
assert wrapped.cache_parameters()["tasks"] == 0
wrapped.cache_clear()
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 0
assert wrapped.cache_info().currsize == 0
assert wrapped.cache_parameters()["tasks"] == 0
def test_cache_info() -> None:
wrapped = _LRUCacheWrapper(mock.ANY, 3, True, None)
assert (0, 0, 3, 0) == wrapped.cache_info()
wrapped._LRUCacheWrapper__cache[1] = 1 # type: ignore[attr-defined]
assert (0, 0, 3, 1) == wrapped.cache_info()
wrapped._LRUCacheWrapper__hits = 2 # type: ignore[attr-defined]
wrapped._LRUCacheWrapper__misses = 3 # type: ignore[attr-defined]
wrapped._LRUCacheWrapper__cache[2] = 2 # type: ignore[attr-defined]
assert (2, 3, 3, 2) == wrapped.cache_info()
async def test_cache_hit() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, True, None)
await wrapped(1)
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 1
await wrapped(1)
assert wrapped.cache_info().hits == 1
assert wrapped.cache_info().misses == 1
await wrapped(1)
assert wrapped.cache_info().hits == 2
assert wrapped.cache_info().misses == 1
async def test_cache_miss() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, True, None)
await wrapped(1)
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 1
await wrapped(2)
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 2
await wrapped(3)
assert wrapped.cache_info().hits == 0
assert wrapped.cache_info().misses == 3
async def test_forbid_call_closed() -> None:
wrapped = _LRUCacheWrapper(mock.AsyncMock(return_value=1), None, True, None)
wrapped._LRUCacheWrapper__closed = True # type: ignore[attr-defined]
with pytest.raises(RuntimeError):
await wrapped(123)
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