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from uuid import uuid4
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
from airflow.contrib.hooks.aws_athena_hook import AWSAthenaHook
[docs]class AWSAthenaOperator(BaseOperator):
"""
An operator that submit presto query to athena.
:param query: Presto to be run on athena. (templated)
:type query: str
:param database: Database to select. (templated)
:type database: str
:param output_location: s3 path to write the query results into. (templated)
:type output_location: str
:param aws_conn_id: aws connection to use
:type aws_conn_id: str
:param sleep_time: Time to wait between two consecutive call to check query status on athena
:type sleep_time: int
"""
[docs] template_fields = ('query', 'database', 'output_location')
@apply_defaults
def __init__(self, query, database, output_location, aws_conn_id='aws_default', client_request_token=None,
query_execution_context=None, result_configuration=None, sleep_time=30, *args, **kwargs):
super(AWSAthenaOperator, self).__init__(*args, **kwargs)
self.query = query
self.database = database
self.output_location = output_location
self.aws_conn_id = aws_conn_id
self.client_request_token = client_request_token or str(uuid4())
self.query_execution_context = query_execution_context or {}
self.result_configuration = result_configuration or {}
self.sleep_time = sleep_time
self.query_execution_id = None
self.hook = None
[docs] def get_hook(self):
return AWSAthenaHook(self.aws_conn_id, self.sleep_time)
[docs] def execute(self, context):
"""
Run Presto Query on Athena
"""
self.hook = self.get_hook()
self.hook.get_conn()
self.query_execution_context['Database'] = self.database
self.result_configuration['OutputLocation'] = self.output_location
self.query_execution_id = self.hook.run_query(self.query, self.query_execution_context,
self.result_configuration, self.client_request_token)
self.hook.poll_query_status(self.query_execution_id)
[docs] def on_kill(self):
"""
Cancel the submitted athena query
"""
if self.query_execution_id:
self.log.info('⚰️⚰️⚰️ Received a kill Signal. Time to Die')
self.log.info(
'Stopping Query with executionId - %s', self.query_execution_id
)
response = self.hook.stop_query(self.query_execution_id)
http_status_code = None
try:
http_status_code = response['ResponseMetadata']['HTTPStatusCode']
except Exception as ex:
self.log.error('Exception while cancelling query', ex)
finally:
if http_status_code is None or http_status_code != 200:
self.log.error('Unable to request query cancel on athena. Exiting')
else:
self.log.info(
'Polling Athena for query with id %s to reach final state', self.query_execution_id
)
self.hook.poll_query_status(self.query_execution_id)