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88 lines
3.0 KiB
88 lines
3.0 KiB
3 years ago
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import typing
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from abc import ABCMeta, abstractmethod
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from types import TracebackType
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from typing import Any, Callable, Coroutine, Optional, Type, TypeVar
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from warnings import warn
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if typing.TYPE_CHECKING:
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from anyio._core._tasks import CancelScope
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T_Retval = TypeVar('T_Retval')
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class TaskStatus(metaclass=ABCMeta):
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@abstractmethod
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def started(self, value: object = None) -> None:
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"""
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Signal that the task has started.
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:param value: object passed back to the starter of the task
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"""
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class TaskGroup(metaclass=ABCMeta):
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"""
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Groups several asynchronous tasks together.
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:ivar cancel_scope: the cancel scope inherited by all child tasks
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:vartype cancel_scope: CancelScope
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"""
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cancel_scope: 'CancelScope'
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async def spawn(self, func: Callable[..., Coroutine[Any, Any, Any]],
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*args: object, name: object = None) -> None:
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"""
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Start a new task in this task group.
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:param func: a coroutine function
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:param args: positional arguments to call the function with
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:param name: name of the task, for the purposes of introspection and debugging
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.. deprecated:: 3.0
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Use :meth:`start_soon` instead. If your code needs AnyIO 2 compatibility, you
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can keep using this until AnyIO 4.
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"""
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warn('spawn() is deprecated -- use start_soon() (without the "await") instead',
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DeprecationWarning)
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self.start_soon(func, *args, name=name)
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@abstractmethod
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def start_soon(self, func: Callable[..., Coroutine[Any, Any, Any]],
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*args: object, name: object = None) -> None:
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"""
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Start a new task in this task group.
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:param func: a coroutine function
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:param args: positional arguments to call the function with
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:param name: name of the task, for the purposes of introspection and debugging
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.. versionadded:: 3.0
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"""
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@abstractmethod
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async def start(self, func: Callable[..., Coroutine[Any, Any, Any]],
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*args: object, name: object = None) -> object:
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"""
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Start a new task and wait until it signals for readiness.
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:param func: a coroutine function
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:param args: positional arguments to call the function with
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:param name: name of the task, for the purposes of introspection and debugging
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:return: the value passed to ``task_status.started()``
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:raises RuntimeError: if the task finishes without calling ``task_status.started()``
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.. versionadded:: 3.0
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"""
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@abstractmethod
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async def __aenter__(self) -> 'TaskGroup':
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"""Enter the task group context and allow starting new tasks."""
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@abstractmethod
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async def __aexit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]:
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"""Exit the task group context waiting for all tasks to finish."""
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