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from airflow.exceptions import AirflowException
from airflow.utils.decorators import apply_defaults
from airflow.contrib.hooks.aws_athena_hook import AWSAthenaHook
from airflow.sensors.base_sensor_operator import BaseSensorOperator
[docs]class AthenaSensor(BaseSensorOperator):
"""
Asks for the state of the Query until it reaches a failure state or success state.
If it fails, failing the task.
:param query_execution_id: query_execution_id to check the state of
:type query_execution_id: str
:param max_retires: Number of times to poll for query state before
returning the current state, defaults to None
:type max_retires: int
:param aws_conn_id: aws connection to use, defaults to 'aws_default'
:type aws_conn_id: str
:param sleep_time: Time to wait between two consecutive call to
check query status on athena, defaults to 10
:type sleep_time: int
"""
[docs] FAILURE_STATES = ('FAILED', 'CANCELLED',)
[docs] SUCCESS_STATES = ('SUCCEEDED',)
[docs] template_fields = ['query_execution_id']
@apply_defaults
def __init__(self,
query_execution_id,
max_retires=None,
aws_conn_id='aws_default',
sleep_time=10,
*args, **kwargs):
super(AthenaSensor, self).__init__(*args, **kwargs)
self.aws_conn_id = aws_conn_id
self.query_execution_id = query_execution_id
self.hook = None
self.sleep_time = sleep_time
self.max_retires = max_retires
[docs] def poke(self, context):
self.hook = self.get_hook()
self.hook.get_conn()
state = self.hook.poll_query_status(self.query_execution_id, self.max_retires)
if state in self.FAILURE_STATES:
raise AirflowException('Athena sensor failed')
if state in self.INTERMEDIATE_STATES:
return False
return True
[docs] def get_hook(self):
return AWSAthenaHook(self.aws_conn_id, self.sleep_time)