airflow redshift_cluster 源码
airflow redshift_cluster 代码
文件路径：/airflow/providers/amazon/aws/sensors/redshift_cluster.py
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# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
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# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
from typing import TYPE_CHECKING, Sequence
from airflow.providers.amazon.aws.hooks.redshift_cluster import RedshiftHook
from airflow.sensors.base import BaseSensorOperator
if TYPE_CHECKING:
from airflow.utils.context import Context
class RedshiftClusterSensor(BaseSensorOperator):
"""
Waits for a Redshift cluster to reach a specific status.
.. seealso::
For more information on how to use this sensor, take a look at the guide:
:ref:`howto/sensor:RedshiftClusterSensor`
:param cluster_identifier: The identifier for the cluster being pinged.
:param target_status: The cluster status desired.
"""
template_fields: Sequence[str] = ('cluster_identifier', 'target_status')
def __init__(
self,
*,
cluster_identifier: str,
target_status: str = 'available',
aws_conn_id: str = 'aws_default',
**kwargs,
):
super().__init__(**kwargs)
self.cluster_identifier = cluster_identifier
self.target_status = target_status
self.aws_conn_id = aws_conn_id
self.hook: RedshiftHook | None = None
def poke(self, context: Context):
self.log.info('Poking for status : %s\nfor cluster %s', self.target_status, self.cluster_identifier)
return self.get_hook().cluster_status(self.cluster_identifier) == self.target_status
def get_hook(self) -> RedshiftHook:
"""Create and return a RedshiftHook"""
if self.hook:
return self.hook
self.hook = RedshiftHook(aws_conn_id=self.aws_conn_id)
return self.hook
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