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from typing import Any, Callable, Optional
from reactivex import Observable, abc, typing
from reactivex.disposable import Disposable
def from_callback_(
func: Callable[..., Callable[..., None]],
mapper: Optional[typing.Mapper[Any, Any]] = None,
) -> Callable[[], Observable[Any]]:
"""Converts a callback function to an observable sequence.
Args:
func: Function with a callback as the last argument to
convert to an Observable sequence.
mapper: [Optional] A mapper which takes the arguments
from the callback to produce a single item to yield on next.
Returns:
A function, when executed with the required arguments minus
the callback, produces an Observable sequence with a single value of
the arguments to the callback as a list.
"""
def function(*args: Any) -> Observable[Any]:
arguments = list(args)
def subscribe(
observer: abc.ObserverBase[Any],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
def handler(*args: Any) -> None:
results = list(args)
if mapper:
try:
results = mapper(args)
except Exception as err: # pylint: disable=broad-except
observer.on_error(err)
return
observer.on_next(results)
else:
if len(results) <= 1:
observer.on_next(*results)
else:
observer.on_next(results)
observer.on_completed()
arguments.append(handler)
func(*arguments)
return Disposable()
return Observable(subscribe)
return function
__all__ = ["from_callback_"]
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