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67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
import functools
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from typing import Awaitable, Callable, ParamSpec, TypeVar
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import anyio
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from anyio import to_thread
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T_ParamSpec = ParamSpec("T_ParamSpec")
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T_Retval = TypeVar("T_Retval")
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def function_has_argument(function: Callable, arg_name: str) -> bool:
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"""Helper function to check if a function has a specific argument."""
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import inspect
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signature = inspect.signature(function)
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return arg_name in signature.parameters
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def asyncify(
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function: Callable[T_ParamSpec, T_Retval],
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*,
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cancellable: bool = False,
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limiter: anyio.CapacityLimiter | None = None,
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) -> Callable[T_ParamSpec, Awaitable[T_Retval]]:
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"""
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Take a blocking function and create an async one that receives the same
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positional and keyword arguments, and that when called, calls the original function
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in a worker thread using `anyio.to_thread.run_sync()`.
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If the `cancellable` option is enabled and the task waiting for its completion is
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cancelled, the thread will still run its course but its return value (or any raised
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exception) will be ignored.
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## Arguments
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- `function`: a blocking regular callable (e.g. a function)
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- `cancellable`: `True` to allow cancellation of the operation
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- `limiter`: capacity limiter to use to limit the total amount of threads running
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(if omitted, the default limiter is used)
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## Return
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An async function that takes the same positional and keyword arguments as the
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original one, that when called runs the same original function in a thread worker
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and returns the result.
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"""
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async def wrapper(
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*args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
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) -> T_Retval:
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partial_f = functools.partial(function, *args, **kwargs)
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# In `v4.1.0` anyio added the `abandon_on_cancel` argument and deprecated the old
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# `cancellable` argument, so we need to use the new `abandon_on_cancel` to avoid
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# surfacing deprecation warnings.
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if function_has_argument(anyio.to_thread.run_sync, "abandon_on_cancel"):
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return await anyio.to_thread.run_sync(
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partial_f,
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abandon_on_cancel=cancellable,
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limiter=limiter,
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)
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return await anyio.to_thread.run_sync(
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partial_f,
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cancellable=cancellable,
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limiter=limiter,
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)
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return wrapper
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