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from dataclasses import dataclass
from datetime import timedelta
from typing import Callable, Generic, Optional, TypeVar
from reactivex import Observable, abc
from reactivex import operators as ops
from reactivex.scheduler import TimeoutScheduler
_T = TypeVar("_T")
@dataclass
class TimeInterval(Generic[_T]):
value: _T
interval: timedelta
def time_interval_(
scheduler: Optional[abc.SchedulerBase] = None,
) -> Callable[[Observable[_T]], Observable[TimeInterval[_T]]]:
def time_interval(source: Observable[_T]) -> Observable[TimeInterval[_T]]:
"""Records the time interval between consecutive values in an
observable sequence.
>>> res = time_interval(source)
Return:
An observable sequence with time interval information on
values.
"""
def subscribe(
observer: abc.ObserverBase[TimeInterval[_T]],
scheduler_: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
_scheduler = scheduler or scheduler_ or TimeoutScheduler.singleton()
last = _scheduler.now
def mapper(value: _T) -> TimeInterval[_T]:
nonlocal last
now = _scheduler.now
span = now - last
last = now
return TimeInterval(value=value, interval=span)
return source.pipe(ops.map(mapper)).subscribe(
observer, scheduler=_scheduler
)
return Observable(subscribe)
return time_interval
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