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- import sys
- from typing import Any, Awaitable, Callable, TypeVar
- from frozenlist import FrozenList
- if sys.version_info >= (3, 11):
- from typing import Unpack
- else:
- from typing_extensions import Unpack
- if sys.version_info >= (3, 13):
- from typing import TypeVarTuple
- else:
- from typing_extensions import TypeVarTuple
- _T = TypeVar("_T")
- _Ts = TypeVarTuple("_Ts", default=Unpack[tuple[()]])
- __version__ = "1.4.0"
- __all__ = ("Signal",)
- class Signal(FrozenList[Callable[[Unpack[_Ts]], Awaitable[object]]]):
- """Coroutine-based signal implementation.
- To connect a callback to a signal, use any list method.
- Signals are fired using the send() coroutine, which takes named
- arguments.
- """
- __slots__ = ("_owner",)
- def __init__(self, owner: object):
- super().__init__()
- self._owner = owner
- def __repr__(self) -> str:
- return "<Signal owner={}, frozen={}, {!r}>".format(
- self._owner, self.frozen, list(self)
- )
- async def send(self, *args: Unpack[_Ts], **kwargs: Any) -> None:
- """
- Sends data to all registered receivers.
- """
- if not self.frozen:
- raise RuntimeError("Cannot send non-frozen signal.")
- for receiver in self:
- await receiver(*args, **kwargs)
- def __call__(
- self, func: Callable[[Unpack[_Ts]], Awaitable[_T]]
- ) -> Callable[[Unpack[_Ts]], Awaitable[_T]]:
- """Decorator to add a function to this Signal."""
- self.append(func)
- return func
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