Source code for airflow.timetables.simple

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from typing import Any, Dict, Optional

from pendulum import DateTime

from airflow.timetables.base import DagRunInfo, DataInterval, TimeRestriction, Timetable


class _TrivialTimetable(Timetable):
    """Some code reuse for "trivial" timetables that has nothing complex."""

    periodic = False
    can_run = False

    @classmethod
    def deserialize(cls, data: Dict[str, Any]) -> "Timetable":
        return cls()

    def __eq__(self, other: Any) -> bool:
        """As long as *other* is of the same type.

        This is only for testing purposes and should not be relied on otherwise.
        """
        if not isinstance(other, type(self)):
            return NotImplemented
        return True

    def serialize(self) -> Dict[str, Any]:
        return {}

    def infer_manual_data_interval(self, *, run_after: DateTime) -> DataInterval:
        return DataInterval.exact(run_after)


[docs]class NullTimetable(_TrivialTimetable): """Timetable that never schedules anything. This corresponds to ``schedule_interval=None``. """
[docs] description: str = "Never, external triggers only"
@property
[docs] def summary(self) -> str: return "None"
[docs] def next_dagrun_info( self, *, last_automated_data_interval: Optional[DataInterval], restriction: TimeRestriction, ) -> Optional[DagRunInfo]: return None
[docs]class OnceTimetable(_TrivialTimetable): """Timetable that schedules the execution once as soon as possible. This corresponds to ``schedule_interval="@once"``. """
[docs] description: str = "Once, as soon as possible"
@property
[docs] def summary(self) -> str: return "@once"
[docs] def next_dagrun_info( self, *, last_automated_data_interval: Optional[DataInterval], restriction: TimeRestriction, ) -> Optional[DagRunInfo]: if last_automated_data_interval is not None: return None # Already run, no more scheduling. if restriction.earliest is None: # No start date, won't run. return None # "@once" always schedule to the start_date determined by the DAG and # tasks, regardless of catchup or not. This has been the case since 1.10 # and we're inheriting it. See AIRFLOW-1928. run_after = restriction.earliest if restriction.latest is not None and run_after > restriction.latest: return None return DagRunInfo.exact(run_after)

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