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from asyncio import Future
from typing import Callable, Optional, TypeVar, Union
from reactivex import Observable, abc, from_future
from reactivex.disposable import CompositeDisposable
from reactivex.internal import noop
_T = TypeVar("_T")
def take_until_(
other: Union[Observable[_T], "Future[_T]"]
) -> Callable[[Observable[_T]], Observable[_T]]:
if isinstance(other, Future):
obs: Observable[_T] = from_future(other)
else:
obs = other
def take_until(source: Observable[_T]) -> Observable[_T]:
"""Returns the values from the source observable sequence until
the other observable sequence produces a value.
Args:
source: The source observable sequence.
Returns:
An observable sequence containing the elements of the source
sequence up to the point the other sequence interrupted
further propagation.
"""
def subscribe(
observer: abc.ObserverBase[_T],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
def on_completed(_: _T) -> None:
observer.on_completed()
return CompositeDisposable(
source.subscribe(observer, scheduler=scheduler),
obs.subscribe(
on_completed, observer.on_error, noop, scheduler=scheduler
),
)
return Observable(subscribe)
return take_until
__all__ = ["take_until_"]
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