Source code for airflow.triggers.deadline

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#
#   http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import annotations

import logging
from collections.abc import AsyncIterator
from typing import Any

from airflow.triggers.base import BaseTrigger, TriggerEvent
from airflow.utils.module_loading import import_string


[docs]
log = logging.getLogger(__name__)



[docs]
PAYLOAD_STATUS_KEY = "state"


[docs]
PAYLOAD_BODY_KEY = "body"




[docs]
class DeadlineCallbackTrigger(BaseTrigger):
    """Trigger that executes a deadline callback function asynchronously."""

    def __init__(self, callback_path: str, callback_kwargs: dict[str, Any] | None = None):
        super().__init__()

[docs]
        self.callback_path = callback_path


[docs]
        self.callback_kwargs = callback_kwargs or {}



[docs]
    def serialize(self) -> tuple[str, dict[str, Any]]:
        return (
            f"{type(self).__module__}.{type(self).__qualname__}",
            {"callback_path": self.callback_path, "callback_kwargs": self.callback_kwargs},
        )



[docs]
    async def run(self) -> AsyncIterator[TriggerEvent]:
        from airflow.models.deadline import DeadlineCallbackState  # to avoid cyclic imports

        try:
            callback = import_string(self.callback_path)
            result = await callback(**self.callback_kwargs)
            log.info("Deadline callback completed with return value: %s", result)
            yield TriggerEvent({PAYLOAD_STATUS_KEY: DeadlineCallbackState.SUCCESS, PAYLOAD_BODY_KEY: result})
        except Exception as e:
            if isinstance(e, ImportError):
                message = "Could not import deadline callback on the triggerer"
            elif isinstance(e, TypeError) and "await" in str(e):
                message = "Deadline callback not awaitable"
            else:
                message = "An error occurred while executing deadline callback"
            log.exception("%s: %s", message, e)
            yield TriggerEvent(
                {PAYLOAD_STATUS_KEY: DeadlineCallbackState.FAILED, PAYLOAD_BODY_KEY: f"{message}: {e}"}
            )