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import asyncio
import platform
import sys
from functools import _CacheInfo, partial
from typing import Callable
import pytest
from async_lru import _CacheParameters, alru_cache
def test_alru_cache_not_callable() -> None:
with pytest.raises(NotImplementedError):
alru_cache("foo") # type: ignore[call-overload]
def test_alru_cache_not_coroutine() -> None:
with pytest.raises(RuntimeError):
@alru_cache # type: ignore[arg-type]
def not_coro(val: int) -> int:
return val
async def test_alru_cache_deco(check_lru: Callable[..., None]) -> None:
@alru_cache
async def coro() -> None:
pass
assert asyncio.iscoroutinefunction(coro)
check_lru(coro, hits=0, misses=0, cache=0, tasks=0)
awaitable = coro()
assert asyncio.iscoroutine(awaitable)
await awaitable
async def test_alru_cache_deco_called(check_lru: Callable[..., None]) -> None:
@alru_cache()
async def coro() -> None:
pass
assert asyncio.iscoroutinefunction(coro)
check_lru(coro, hits=0, misses=0, cache=0, tasks=0)
awaitable = coro()
assert asyncio.iscoroutine(awaitable)
await awaitable
async def test_alru_cache_fn_called(check_lru: Callable[..., None]) -> None:
async def coro() -> None:
pass
coro_wrapped = alru_cache(coro)
assert asyncio.iscoroutinefunction(coro_wrapped)
check_lru(coro_wrapped, hits=0, misses=0, cache=0, tasks=0)
awaitable = coro_wrapped()
assert asyncio.iscoroutine(awaitable)
await awaitable
async def test_alru_cache_partial() -> None:
async def coro(val: int) -> int:
return val
coro_wrapped1 = alru_cache(coro)
assert await coro_wrapped1(1) == 1
coro_wrapped2 = alru_cache(partial(coro, 2))
assert await coro_wrapped2() == 2
async def test_alru_cache_await_same_result_async(
check_lru: Callable[..., None]
) -> None:
calls = 0
val = object()
@alru_cache()
async def coro() -> object:
nonlocal calls
calls += 1
return val
coros = [coro() for _ in range(100)]
ret = await asyncio.gather(*coros)
expected = [val] * 100
assert ret == expected
check_lru(coro, hits=99, misses=1, cache=1, tasks=0)
assert calls == 1
assert await coro() is val
check_lru(coro, hits=100, misses=1, cache=1, tasks=0)
async def test_alru_cache_await_same_result_coroutine(
check_lru: Callable[..., None]
) -> None:
calls = 0
val = object()
@alru_cache()
async def coro() -> object:
nonlocal calls
calls += 1
return val
coros = [coro() for _ in range(100)]
ret = await asyncio.gather(*coros)
expected = [val] * 100
assert ret == expected
check_lru(coro, hits=99, misses=1, cache=1, tasks=0)
assert calls == 1
assert await coro() is val
check_lru(coro, hits=100, misses=1, cache=1, tasks=0)
async def test_alru_cache_dict_not_shared(check_lru: Callable[..., None]) -> None:
async def coro(val: int) -> int:
return val
coro1 = alru_cache()(coro)
coro2 = alru_cache()(coro)
ret1 = await coro1(1)
check_lru(coro1, hits=0, misses=1, cache=1, tasks=0)
ret2 = await coro2(1)
check_lru(coro2, hits=0, misses=1, cache=1, tasks=0)
assert ret1 == ret2
assert (
coro1._LRUCacheWrapper__cache[1].fut.result() # type: ignore[attr-defined]
== coro2._LRUCacheWrapper__cache[1].fut.result() # type: ignore[attr-defined]
)
assert coro1._LRUCacheWrapper__cache != coro2._LRUCacheWrapper__cache # type: ignore[attr-defined]
assert coro1._LRUCacheWrapper__cache.keys() == coro2._LRUCacheWrapper__cache.keys() # type: ignore[attr-defined]
assert coro1._LRUCacheWrapper__cache is not coro2._LRUCacheWrapper__cache # type: ignore[attr-defined]
async def test_alru_cache_parameters() -> None:
@alru_cache
async def coro(val: int) -> int:
return val
assert coro.cache_parameters() == _CacheParameters(
typed=False,
maxsize=128,
tasks=0,
closed=False,
)
await coro(1)
assert coro.cache_parameters() == _CacheParameters(
typed=False,
maxsize=128,
tasks=0,
closed=False,
)
async def test_alru_cache_method() -> None:
class A:
def __init__(self, val: int) -> None:
self.val = val
@alru_cache
async def coro(self) -> int:
return self.val
a = A(42)
assert await a.coro() == 42
assert a.coro.cache_parameters() == _CacheParameters(
typed=False,
maxsize=128,
tasks=0,
closed=False,
)
@pytest.mark.xfail(
sys.version_info[:2] == (3, 9) and platform.python_implementation() != "PyPy",
reason="#511",
)
async def test_alru_cache_classmethod() -> None:
class A:
offset = 3
@classmethod
@alru_cache
async def coro(cls, val: int) -> int:
return val + cls.offset
assert await A.coro(5) == 8
assert A.coro.cache_parameters() == _CacheParameters(
typed=False,
maxsize=128,
tasks=0,
closed=False,
)
async def test_invalidate_cache_for_method() -> None:
class A:
@alru_cache
async def coro(self, val: int) -> int:
return val
a = A()
assert await a.coro(42) == 42
assert a.coro.cache_info() == _CacheInfo(0, 1, 128, 1)
a.coro.cache_invalidate(42)
assert a.coro.cache_info() == _CacheInfo(0, 1, 128, 0)
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