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from asyncio import Future
from typing import Any, Callable, Optional, TypeVar, Union
from reactivex import Observable, abc, from_future
from reactivex.disposable import CompositeDisposable, SingleAssignmentDisposable
_T = TypeVar("_T")
def skip_until_(
other: Union[Observable[Any], "Future[Any]"]
) -> Callable[[Observable[_T]], Observable[_T]]:
"""Returns the values from the source observable sequence only after
the other observable sequence produces a value.
Args:
other: The observable sequence that triggers propagation of
elements of the source sequence.
Returns:
An observable sequence containing the elements of the source
sequence starting from the point the other sequence triggered
propagation.
"""
if isinstance(other, Future):
obs: Observable[Any] = from_future(other)
else:
obs = other
def skip_until(source: Observable[_T]) -> Observable[_T]:
def subscribe(
observer: abc.ObserverBase[_T],
scheduler: Optional[abc.SchedulerBase] = None,
):
is_open = [False]
def on_next(left: _T) -> None:
if is_open[0]:
observer.on_next(left)
def on_completed() -> None:
if is_open[0]:
observer.on_completed()
subs = source.subscribe(
on_next, observer.on_error, on_completed, scheduler=scheduler
)
subscriptions = CompositeDisposable(subs)
right_subscription = SingleAssignmentDisposable()
subscriptions.add(right_subscription)
def on_next2(x: Any) -> None:
is_open[0] = True
right_subscription.dispose()
def on_completed2():
right_subscription.dispose()
right_subscription.disposable = obs.subscribe(
on_next2, observer.on_error, on_completed2, scheduler=scheduler
)
return subscriptions
return Observable(subscribe)
return skip_until
__all__ = ["skip_until_"]
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