ferruzzi commented on code in PR #50677:
URL: https://github.com/apache/airflow/pull/50677#discussion_r2098415699
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airflow-core/src/airflow/models/deadline.py:
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@@ -123,7 +122,71 @@ class DeadlineReference(Enum):
dag.deadline.reference.evaluate_with(dag_id=dag.dag_id)
"""
+ # Available References.
+ #
+ # The value is the name of the method executed to fetch the datetime
+ # value for the given Reference. For example DAGRUN_LOGICAL_DATE =
"dagrun_logical_date"
+ # will execute dagrun_logical_date() to find the dagrun's logical date.
DAGRUN_LOGICAL_DATE = "dagrun_logical_date"
+ DAGRUN_QUEUED_AT = "dagrun_queued_at"
+ _CUSTOM_REFERENCE_BASE = "_custom_reference"
+
+ def __init__(self, value):
+ self._fixed_dt = None # Initialize the storage for fixed datetime
+ super().__init__()
+
+ @classmethod
+ def FIXED_DATETIME(cls, dt: datetime):
+ """
+ Calculate a reference based on a set datetime rather than fetching a
value from the database.
+
+ For example, you could set the Deadline for "tomorrow before 9AM" by
+ providing the appropriate datetime object."
+ """
+ instance = object.__new__(cls)
+ instance._value_ = "fixed_datetime"
+ instance._fixed_dt = dt
+ return instance
+
+ def evaluate_with(self, **kwargs):
+ """Call the method in the enum's value with the provided kwargs."""
+ if self._fixed_dt:
+ return self._fixed_dt
+ return getattr(self, self.value)(**kwargs)
+
+ def evaluate(self):
+ """Call evaluate_with() without any conditions, because it looks
strange in use that way."""
+ return self.evaluate_with()
+
+ @provide_session
+ def _fetch_from_db(self, model_class: Base, column: str, session=None,
**conditions) -> datetime:
Review Comment:
I debated that a lot myself. If anyone feels strongly, then I can drop it
and the two current cases where it is used can be reverted to session.scalar
calls. Keep in mind that this is intended to be reused by any number of future
References and may or may not be more useful with those.
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