375 lines
9.4 KiB
Python
375 lines
9.4 KiB
Python
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from __future__ import annotations
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import math
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import sys
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from abc import ABCMeta, abstractmethod
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from collections.abc import AsyncIterator, Awaitable, Callable, Sequence
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from contextlib import AbstractContextManager
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from os import PathLike
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from signal import Signals
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from socket import AddressFamily, SocketKind, socket
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from typing import (
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IO,
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TYPE_CHECKING,
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Any,
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TypeVar,
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Union,
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overload,
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)
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if sys.version_info >= (3, 11):
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from typing import TypeVarTuple, Unpack
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else:
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from typing_extensions import TypeVarTuple, Unpack
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if sys.version_info >= (3, 10):
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from typing import TypeAlias
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else:
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from typing_extensions import TypeAlias
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if TYPE_CHECKING:
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from .._core._synchronization import CapacityLimiter, Event, Lock, Semaphore
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from .._core._tasks import CancelScope
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from .._core._testing import TaskInfo
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from ..from_thread import BlockingPortal
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from ._sockets import (
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ConnectedUDPSocket,
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ConnectedUNIXDatagramSocket,
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IPSockAddrType,
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SocketListener,
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SocketStream,
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UDPSocket,
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UNIXDatagramSocket,
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UNIXSocketStream,
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)
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from ._subprocesses import Process
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from ._tasks import TaskGroup
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from ._testing import TestRunner
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T_Retval = TypeVar("T_Retval")
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PosArgsT = TypeVarTuple("PosArgsT")
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StrOrBytesPath: TypeAlias = Union[str, bytes, "PathLike[str]", "PathLike[bytes]"]
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class AsyncBackend(metaclass=ABCMeta):
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@classmethod
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@abstractmethod
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def run(
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cls,
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func: Callable[[Unpack[PosArgsT]], Awaitable[T_Retval]],
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args: tuple[Unpack[PosArgsT]],
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kwargs: dict[str, Any],
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options: dict[str, Any],
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) -> T_Retval:
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"""
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Run the given coroutine function in an asynchronous event loop.
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The current thread must not be already running an event loop.
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:param func: a coroutine function
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:param args: positional arguments to ``func``
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:param kwargs: positional arguments to ``func``
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:param options: keyword arguments to call the backend ``run()`` implementation
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with
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:return: the return value of the coroutine function
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"""
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@classmethod
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@abstractmethod
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def current_token(cls) -> object:
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"""
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:return:
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"""
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@classmethod
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@abstractmethod
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def current_time(cls) -> float:
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"""
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Return the current value of the event loop's internal clock.
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:return: the clock value (seconds)
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"""
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@classmethod
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@abstractmethod
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def cancelled_exception_class(cls) -> type[BaseException]:
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"""Return the exception class that is raised in a task if it's cancelled."""
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@classmethod
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@abstractmethod
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async def checkpoint(cls) -> None:
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"""
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Check if the task has been cancelled, and allow rescheduling of other tasks.
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This is effectively the same as running :meth:`checkpoint_if_cancelled` and then
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:meth:`cancel_shielded_checkpoint`.
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"""
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@classmethod
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async def checkpoint_if_cancelled(cls) -> None:
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"""
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Check if the current task group has been cancelled.
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This will check if the task has been cancelled, but will not allow other tasks
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to be scheduled if not.
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"""
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if cls.current_effective_deadline() == -math.inf:
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await cls.checkpoint()
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@classmethod
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async def cancel_shielded_checkpoint(cls) -> None:
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"""
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Allow the rescheduling of other tasks.
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This will give other tasks the opportunity to run, but without checking if the
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current task group has been cancelled, unlike with :meth:`checkpoint`.
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"""
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with cls.create_cancel_scope(shield=True):
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await cls.sleep(0)
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@classmethod
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@abstractmethod
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async def sleep(cls, delay: float) -> None:
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"""
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Pause the current task for the specified duration.
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:param delay: the duration, in seconds
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"""
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@classmethod
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@abstractmethod
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def create_cancel_scope(
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cls, *, deadline: float = math.inf, shield: bool = False
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) -> CancelScope:
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pass
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@classmethod
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@abstractmethod
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def current_effective_deadline(cls) -> float:
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"""
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Return the nearest deadline among all the cancel scopes effective for the
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current task.
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:return:
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- a clock value from the event loop's internal clock
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- ``inf`` if there is no deadline in effect
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- ``-inf`` if the current scope has been cancelled
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:rtype: float
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"""
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@classmethod
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@abstractmethod
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def create_task_group(cls) -> TaskGroup:
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pass
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@classmethod
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@abstractmethod
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def create_event(cls) -> Event:
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pass
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@classmethod
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@abstractmethod
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def create_lock(cls, *, fast_acquire: bool) -> Lock:
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pass
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@classmethod
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@abstractmethod
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def create_semaphore(
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cls,
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initial_value: int,
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*,
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max_value: int | None = None,
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fast_acquire: bool = False,
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) -> Semaphore:
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pass
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@classmethod
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@abstractmethod
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def create_capacity_limiter(cls, total_tokens: float) -> CapacityLimiter:
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pass
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@classmethod
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@abstractmethod
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async def run_sync_in_worker_thread(
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cls,
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func: Callable[[Unpack[PosArgsT]], T_Retval],
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args: tuple[Unpack[PosArgsT]],
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abandon_on_cancel: bool = False,
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limiter: CapacityLimiter | None = None,
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) -> T_Retval:
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pass
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@classmethod
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@abstractmethod
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def check_cancelled(cls) -> None:
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pass
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@classmethod
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@abstractmethod
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def run_async_from_thread(
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cls,
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func: Callable[[Unpack[PosArgsT]], Awaitable[T_Retval]],
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args: tuple[Unpack[PosArgsT]],
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token: object,
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) -> T_Retval:
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pass
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@classmethod
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@abstractmethod
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def run_sync_from_thread(
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cls,
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func: Callable[[Unpack[PosArgsT]], T_Retval],
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args: tuple[Unpack[PosArgsT]],
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token: object,
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) -> T_Retval:
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pass
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@classmethod
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@abstractmethod
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def create_blocking_portal(cls) -> BlockingPortal:
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pass
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@classmethod
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@abstractmethod
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async def open_process(
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cls,
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command: StrOrBytesPath | Sequence[StrOrBytesPath],
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*,
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stdin: int | IO[Any] | None,
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stdout: int | IO[Any] | None,
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stderr: int | IO[Any] | None,
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**kwargs: Any,
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) -> Process:
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pass
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@classmethod
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@abstractmethod
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def setup_process_pool_exit_at_shutdown(cls, workers: set[Process]) -> None:
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pass
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@classmethod
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@abstractmethod
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async def connect_tcp(
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cls, host: str, port: int, local_address: IPSockAddrType | None = None
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) -> SocketStream:
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pass
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@classmethod
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@abstractmethod
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async def connect_unix(cls, path: str | bytes) -> UNIXSocketStream:
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pass
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@classmethod
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@abstractmethod
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def create_tcp_listener(cls, sock: socket) -> SocketListener:
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pass
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@classmethod
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@abstractmethod
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def create_unix_listener(cls, sock: socket) -> SocketListener:
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pass
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@classmethod
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@abstractmethod
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async def create_udp_socket(
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cls,
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family: AddressFamily,
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local_address: IPSockAddrType | None,
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remote_address: IPSockAddrType | None,
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reuse_port: bool,
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) -> UDPSocket | ConnectedUDPSocket:
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pass
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@classmethod
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@overload
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async def create_unix_datagram_socket(
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cls, raw_socket: socket, remote_path: None
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) -> UNIXDatagramSocket: ...
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@classmethod
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@overload
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async def create_unix_datagram_socket(
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cls, raw_socket: socket, remote_path: str | bytes
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) -> ConnectedUNIXDatagramSocket: ...
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@classmethod
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@abstractmethod
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async def create_unix_datagram_socket(
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cls, raw_socket: socket, remote_path: str | bytes | None
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) -> UNIXDatagramSocket | ConnectedUNIXDatagramSocket:
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pass
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@classmethod
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@abstractmethod
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async def getaddrinfo(
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cls,
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host: bytes | str | None,
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port: str | int | None,
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*,
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family: int | AddressFamily = 0,
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type: int | SocketKind = 0,
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proto: int = 0,
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flags: int = 0,
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) -> list[
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tuple[
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AddressFamily,
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SocketKind,
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int,
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str,
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tuple[str, int] | tuple[str, int, int, int],
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]
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]:
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pass
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@classmethod
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@abstractmethod
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async def getnameinfo(
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cls, sockaddr: IPSockAddrType, flags: int = 0
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) -> tuple[str, str]:
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pass
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@classmethod
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@abstractmethod
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async def wait_socket_readable(cls, sock: socket) -> None:
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pass
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@classmethod
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@abstractmethod
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async def wait_socket_writable(cls, sock: socket) -> None:
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pass
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@classmethod
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@abstractmethod
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def current_default_thread_limiter(cls) -> CapacityLimiter:
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pass
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@classmethod
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@abstractmethod
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def open_signal_receiver(
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cls, *signals: Signals
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) -> AbstractContextManager[AsyncIterator[Signals]]:
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pass
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@classmethod
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@abstractmethod
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def get_current_task(cls) -> TaskInfo:
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pass
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@classmethod
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@abstractmethod
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def get_running_tasks(cls) -> Sequence[TaskInfo]:
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pass
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@classmethod
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@abstractmethod
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async def wait_all_tasks_blocked(cls) -> None:
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pass
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@classmethod
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@abstractmethod
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def create_test_runner(cls, options: dict[str, Any]) -> TestRunner:
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pass
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