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

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from typing import Any, Dict, Iterable, Optional

from airflow.providers.amazon.aws.sensors.emr_base import EmrBaseSensor
from airflow.utils.decorators import apply_defaults


[docs]class EmrStepSensor(EmrBaseSensor):
    """
    Asks for the state of the step until it reaches any of the target states.
    If it fails the sensor errors, failing the task.

    With the default target states, sensor waits step to be completed.

    :param job_flow_id: job_flow_id which contains the step check the state of
    :type job_flow_id: str
    :param step_id: step to check the state of
    :type step_id: str
    :param target_states: the target states, sensor waits until
        step reaches any of these states
    :type target_states: list[str]
    :param failed_states: the failure states, sensor fails when
        step reaches any of these states
    :type failed_states: list[str]
    """

[docs]    template_fields = ['job_flow_id', 'step_id', 'target_states', 'failed_states']
[docs]    template_ext = ()

    @apply_defaults
    def __init__(
        self,
        *,
        job_flow_id: str,
        step_id: str,
        target_states: Optional[Iterable[str]] = None,
        failed_states: Optional[Iterable[str]] = None,
        **kwargs,
    ):
        super().__init__(**kwargs)
        self.job_flow_id = job_flow_id
        self.step_id = step_id
        self.target_states = target_states or ['COMPLETED']
        self.failed_states = failed_states or ['CANCELLED', 'FAILED', 'INTERRUPTED']

[docs]    def get_emr_response(self) -> Dict[str, Any]:
        """
        Make an API call with boto3 and get details about the cluster step.

        .. seealso::
            https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/emr.html#EMR.Client.describe_step

        :return: response
        :rtype: dict[str, Any]
        """
        emr_client = self.get_hook().get_conn()

        self.log.info('Poking step %s on cluster %s', self.step_id, self.job_flow_id)
        return emr_client.describe_step(ClusterId=self.job_flow_id, StepId=self.step_id)

    @staticmethod
[docs]    def state_from_response(response: Dict[str, Any]) -> str:
        """
        Get state from response dictionary.

        :param response: response from AWS API
        :type response: dict[str, Any]
        :return: execution state of the cluster step
        :rtype: str
        """
        return response['Step']['Status']['State']

    @staticmethod
[docs]    def failure_message_from_response(response: Dict[str, Any]) -> Optional[str]:
        """
        Get failure message from response dictionary.

        :param response: response from AWS API
        :type response: dict[str, Any]
        :return: failure message
        :rtype: Optional[str]
        """
        fail_details = response['Step']['Status'].get('FailureDetails')
        if fail_details:
            return 'for reason {} with message {} and log file {}'.format(
                fail_details.get('Reason'), fail_details.get('Message'), fail_details.get('LogFile')
            )
        return None