55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
"""
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Some useful helpers for working in async contexts.
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"""
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from asyncio import get_running_loop
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from functools import partial, wraps
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from time import time
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from async_lru import alru_cache
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def run_in_executor(f):
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"""
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Decorator to make blocking a function call asyncio compatible.
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https://stackoverflow.com/questions/41063331/how-to-use-asyncio-with-existing-blocking-library/
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https://stackoverflow.com/a/53719009
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"""
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@wraps(f)
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async def wrapper(*args, **kwargs):
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loop = get_running_loop()
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return await loop.run_in_executor(
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None,
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partial(f, *args, **kwargs),
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)
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return wrapper
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def get_ttl_hash(seconds: int = 20) -> int:
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"""
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Return the same value within `seconds` time period.
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https://stackoverflow.com/a/55900800
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"""
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return round(time() / seconds)
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def timed_alru_cache(*decorator_args, **decorator_kwargs):
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"""
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Decorator which adds an (unused) param `ttl_hash`
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and the `alru_cache` annotation to a function.
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"""
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def decorate(f):
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@alru_cache(*decorator_args, **decorator_kwargs)
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@wraps(f)
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async def wrapper(ttl_hash: int, *args, **kwargs):
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del ttl_hash
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return await f(*args, **kwargs)
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return wrapper
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return decorate
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