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from typing import TYPE_CHECKING, Iterable, Optional, Sequence

from airflow.exceptions import AirflowException
from import DmsHook
from airflow.sensors.base import BaseSensorOperator

    from airflow.utils.context import Context

[docs]class DmsTaskBaseSensor(BaseSensorOperator): """ Contains general sensor behavior for DMS task. Subclasses should set ``target_statuses`` and ``termination_statuses`` fields. :param replication_task_arn: AWS DMS replication task ARN :param aws_conn_id: aws connection to uses :param target_statuses: the target statuses, sensor waits until the task reaches any of these states :param termination_statuses: the termination statuses, sensor fails when the task reaches any of these states """
[docs] template_fields: Sequence[str] = ('replication_task_arn',)
[docs] template_ext: Sequence[str] = ()
def __init__( self, replication_task_arn: str, aws_conn_id='aws_default', target_statuses: Optional[Iterable[str]] = None, termination_statuses: Optional[Iterable[str]] = None, *args, **kwargs, ): super().__init__(*args, **kwargs) self.aws_conn_id = aws_conn_id self.replication_task_arn = replication_task_arn self.target_statuses: Iterable[str] = target_statuses or [] self.termination_statuses: Iterable[str] = termination_statuses or [] self.hook: Optional[DmsHook] = None
[docs] def get_hook(self) -> DmsHook: """Get DmsHook""" if self.hook: return self.hook self.hook = DmsHook(self.aws_conn_id) return self.hook
[docs] def poke(self, context: 'Context'): status: Optional[str] = self.get_hook().get_task_status(self.replication_task_arn) if not status: raise AirflowException( f'Failed to read task status, task with ARN {self.replication_task_arn} not found' )'DMS Replication task (%s) has status: %s', self.replication_task_arn, status) if status in self.target_statuses: return True if status in self.termination_statuses: raise AirflowException(f'Unexpected status: {status}') return False
[docs]class DmsTaskCompletedSensor(DmsTaskBaseSensor): """ Pokes DMS task until it is completed. .. seealso:: For more information on how to use this sensor, take a look at the guide: :ref:`howto/sensor:DmsTaskCompletedSensor` :param replication_task_arn: AWS DMS replication task ARN """
[docs] template_fields: Sequence[str] = ('replication_task_arn',)
[docs] template_ext: Sequence[str] = ()
def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.target_statuses = ['stopped'] self.termination_statuses = [ 'creating', 'deleting', 'failed', 'failed-move', 'modifying', 'moving', 'ready', 'testing',

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