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import asyncio
from typing import Callable
from async_lru import alru_cache
async def test_alru_cache_removing_lru_keys(check_lru: Callable[..., None]) -> None:
@alru_cache(maxsize=3)
async def coro(val: int) -> int:
return val
for i, v in enumerate([3, 4, 5]):
await coro(v)
check_lru(coro, hits=0, misses=i + 1, cache=i + 1, tasks=0, maxsize=3)
check_lru(coro, hits=0, misses=3, cache=3, tasks=0, maxsize=3)
assert list(coro._LRUCacheWrapper__cache) == [3, 4, 5] # type: ignore[attr-defined]
for v in [3, 2, 1]:
await coro(v)
check_lru(coro, hits=1, misses=5, cache=3, tasks=0, maxsize=3)
assert list(coro._LRUCacheWrapper__cache) == [3, 2, 1] # type: ignore[attr-defined]
async def test_alru_cache_removing_lru_keys_with_full_displacement(
check_lru: Callable[..., None]
) -> None:
@alru_cache(maxsize=3)
async def coro(val: int) -> int:
return val
for i, v in enumerate([3, 4, 5]):
await coro(v)
check_lru(coro, hits=0, misses=i + 1, cache=i + 1, tasks=0, maxsize=3)
check_lru(coro, hits=0, misses=3, cache=3, tasks=0, maxsize=3)
assert list(coro._LRUCacheWrapper__cache) == [3, 4, 5] # type: ignore[attr-defined]
for v in [1, 2, 3]:
await coro(v)
check_lru(coro, hits=0, misses=6, cache=3, tasks=0, maxsize=3)
assert list(coro._LRUCacheWrapper__cache) == [1, 2, 3] # type: ignore[attr-defined]
async def test_alru_cache_none_max_size(check_lru: Callable[..., None]) -> None:
@alru_cache(maxsize=None)
async def coro(val: int) -> int:
return val
inputs = [1, 2, 3, 4] * 2
coros = [coro(v) for v in inputs]
ret = await asyncio.gather(*coros)
check_lru(coro, hits=4, misses=4, cache=4, tasks=0, maxsize=None)
assert ret == inputs
async def test_alru_cache_zero_max_size(check_lru: Callable[..., None]) -> None:
@alru_cache(maxsize=0)
async def coro(val: int) -> int:
return val
inputs = [1, 2, 3, 4] * 2
coros = [coro(v) for v in inputs]
ret = await asyncio.gather(*coros)
check_lru(coro, hits=0, misses=8, cache=0, tasks=0, maxsize=0)
assert ret == inputs
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