Source code for airflow.providers.amazon.aws.sensors.step_function_execution

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import json
from typing import Optional

from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.step_function import StepFunctionHook
from airflow.sensors.base import BaseSensorOperator


[docs]class StepFunctionExecutionSensor(BaseSensorOperator): """ Asks for the state of the Step Function State Machine Execution until it reaches a failure state or success state. If it fails, failing the task. On successful completion of the Execution the Sensor will do an XCom Push of the State Machine's output to `output` :param execution_arn: execution_arn to check the state of :type execution_arn: str :param aws_conn_id: aws connection to use, defaults to 'aws_default' :type aws_conn_id: str """
[docs] INTERMEDIATE_STATES = ('RUNNING',)
[docs] FAILURE_STATES = ( 'FAILED', 'TIMED_OUT', 'ABORTED',
)
[docs] SUCCESS_STATES = ('SUCCEEDED',)
[docs] template_fields = ['execution_arn']
[docs] template_ext = ()
[docs] ui_color = '#66c3ff'
def __init__( self, *, execution_arn: str, aws_conn_id: str = 'aws_default', region_name: Optional[str] = None, **kwargs, ): super().__init__(**kwargs) self.execution_arn = execution_arn self.aws_conn_id = aws_conn_id self.region_name = region_name self.hook: Optional[StepFunctionHook] = None
[docs] def poke(self, context): execution_status = self.get_hook().describe_execution(self.execution_arn) state = execution_status['status'] output = json.loads(execution_status['output']) if 'output' in execution_status else None if state in self.FAILURE_STATES: raise AirflowException(f'Step Function sensor failed. State Machine Output: {output}') if state in self.INTERMEDIATE_STATES: return False self.log.info('Doing xcom_push of output') self.xcom_push(context, 'output', output) return True
[docs] def get_hook(self) -> StepFunctionHook: """Create and return a StepFunctionHook""" if self.hook: return self.hook self.hook = StepFunctionHook(aws_conn_id=self.aws_conn_id, region_name=self.region_name) return self.hook

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