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