Source code for airflow.providers.apache.livy.sensors.livy

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"""This module contains the Apache Livy sensor."""

from __future__ import annotations

from collections.abc import Sequence
from typing import TYPE_CHECKING, Any

from airflow.providers.apache.livy.hooks.livy import LivyHook
from airflow.sensors.base import BaseSensorOperator

if TYPE_CHECKING:
    from airflow.utils.context import Context



[docs]class LivySensor(BaseSensorOperator):
    """
    Monitor a Livy sessions for termination.

    :param livy_conn_id: reference to a pre-defined Livy connection
    :param batch_id: identifier of the monitored batch
        depends on the option that's being modified.
    """


[docs]    template_fields: Sequence[str] = ("batch_id",)


    def __init__(
        self,
        *,
        batch_id: int | str,
        livy_conn_id: str = "livy_default",
        livy_conn_auth_type: Any | None = None,
        extra_options: dict[str, Any] | None = None,
        **kwargs: Any,
    ) -> None:
        super().__init__(**kwargs)
        self.batch_id = batch_id
        self._livy_conn_id = livy_conn_id
        self._livy_conn_auth_type = livy_conn_auth_type
        self._livy_hook: LivyHook | None = None
        self._extra_options = extra_options or {}


[docs]    def get_hook(self) -> LivyHook:
        """
        Get valid hook.

        :return: hook
        """
        if self._livy_hook is None or not isinstance(self._livy_hook, LivyHook):
            self._livy_hook = LivyHook(
                livy_conn_id=self._livy_conn_id,
                extra_options=self._extra_options,
                auth_type=self._livy_conn_auth_type,
            )
        return self._livy_hook



[docs]    def poke(self, context: Context) -> bool:
        batch_id = self.batch_id

        status = self.get_hook().get_batch_state(batch_id)
        return status in self.get_hook().TERMINAL_STATES

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