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"""This module contains AWS Athena hook"""
from time import sleep
from typing import Any, Dict, Optional
from botocore.paginate import PageIterator
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
[docs]class AWSAthenaHook(AwsBaseHook):
"""
Interact with AWS Athena to run, poll queries and return query results
Additional arguments (such as ``aws_conn_id``) may be specified and
are passed down to the underlying AwsBaseHook.
.. seealso::
:class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
:param sleep_time: Time (in seconds) to wait between two consecutive calls to check query status on Athena
:type sleep_time: int
"""
)
[docs] FAILURE_STATES = (
'FAILED',
'CANCELLED',
)
[docs] SUCCESS_STATES = ('SUCCEEDED',)
def __init__(self, *args: Any, sleep_time: int = 30, **kwargs: Any) -> None:
super().__init__(client_type='athena', *args, **kwargs) # type: ignore
self.sleep_time = sleep_time
[docs] def run_query(
self,
query: str,
query_context: Dict[str, str],
result_configuration: Dict[str, Any],
client_request_token: Optional[str] = None,
workgroup: str = 'primary',
) -> str:
"""
Run Presto query on athena with provided config and return submitted query_execution_id
:param query: Presto query to run
:type query: str
:param query_context: Context in which query need to be run
:type query_context: dict
:param result_configuration: Dict with path to store results in and config related to encryption
:type result_configuration: dict
:param client_request_token: Unique token created by user to avoid multiple executions of same query
:type client_request_token: str
:param workgroup: Athena workgroup name, when not specified, will be 'primary'
:type workgroup: str
:return: str
"""
params = {
'QueryString': query,
'QueryExecutionContext': query_context,
'ResultConfiguration': result_configuration,
'WorkGroup': workgroup,
}
if client_request_token:
params['ClientRequestToken'] = client_request_token
response = self.get_conn().start_query_execution(**params)
query_execution_id = response['QueryExecutionId']
return query_execution_id
[docs] def check_query_status(self, query_execution_id: str) -> Optional[str]:
"""
Fetch the status of submitted athena query. Returns None or one of valid query states.
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:return: str
"""
response = self.get_conn().get_query_execution(QueryExecutionId=query_execution_id)
state = None
try:
state = response['QueryExecution']['Status']['State']
except Exception as ex:
self.log.error('Exception while getting query state %s', ex)
finally:
# The error is being absorbed here and is being handled by the caller.
# The error is being absorbed to implement retries.
return state
[docs] def get_state_change_reason(self, query_execution_id: str) -> Optional[str]:
"""
Fetch the reason for a state change (e.g. error message). Returns None or reason string.
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:return: str
"""
response = self.get_conn().get_query_execution(QueryExecutionId=query_execution_id)
reason = None
try:
reason = response['QueryExecution']['Status']['StateChangeReason']
except Exception as ex:
self.log.error('Exception while getting query state change reason: %s', ex)
finally:
# The error is being absorbed here and is being handled by the caller.
# The error is being absorbed to implement retries.
return reason
[docs] def get_query_results(
self, query_execution_id: str, next_token_id: Optional[str] = None, max_results: int = 1000
) -> Optional[dict]:
"""
Fetch submitted athena query results. returns none if query is in intermediate state or
failed/cancelled state else dict of query output
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:param next_token_id: The token that specifies where to start pagination.
:type next_token_id: str
:param max_results: The maximum number of results (rows) to return in this request.
:type max_results: int
:return: dict
"""
query_state = self.check_query_status(query_execution_id)
if query_state is None:
self.log.error('Invalid Query state')
return None
elif query_state in self.INTERMEDIATE_STATES or query_state in self.FAILURE_STATES:
self.log.error('Query is in "%s" state. Cannot fetch results', query_state)
return None
result_params = {'QueryExecutionId': query_execution_id, 'MaxResults': max_results}
if next_token_id:
result_params['NextToken'] = next_token_id
return self.get_conn().get_query_results(**result_params)
[docs] def get_query_results_paginator(
self,
query_execution_id: str,
max_items: Optional[int] = None,
page_size: Optional[int] = None,
starting_token: Optional[str] = None,
) -> Optional[PageIterator]:
"""
Fetch submitted athena query results. returns none if query is in intermediate state or
failed/cancelled state else a paginator to iterate through pages of results. If you
wish to get all results at once, call build_full_result() on the returned PageIterator
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:param max_items: The total number of items to return.
:type max_items: int
:param page_size: The size of each page.
:type page_size: int
:param starting_token: A token to specify where to start paginating.
:type starting_token: str
:return: PageIterator
"""
query_state = self.check_query_status(query_execution_id)
if query_state is None:
self.log.error('Invalid Query state (null)')
return None
if query_state in self.INTERMEDIATE_STATES or query_state in self.FAILURE_STATES:
self.log.error('Query is in "%s" state. Cannot fetch results', query_state)
return None
result_params = {
'QueryExecutionId': query_execution_id,
'PaginationConfig': {
'MaxItems': max_items,
'PageSize': page_size,
'StartingToken': starting_token,
},
}
paginator = self.get_conn().get_paginator('get_query_results')
return paginator.paginate(**result_params)
[docs] def poll_query_status(self, query_execution_id: str, max_tries: Optional[int] = None) -> Optional[str]:
"""
Poll the status of submitted athena query until query state reaches final state.
Returns one of the final states
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:param max_tries: Number of times to poll for query state before function exits
:type max_tries: int
:return: str
"""
try_number = 1
final_query_state = None # Query state when query reaches final state or max_tries reached
while True:
query_state = self.check_query_status(query_execution_id)
if query_state is None:
self.log.info('Trial %s: Invalid query state. Retrying again', try_number)
elif query_state in self.INTERMEDIATE_STATES:
self.log.info(
'Trial %s: Query is still in an intermediate state - %s', try_number, query_state
)
else:
self.log.info(
'Trial %s: Query execution completed. Final state is %s}', try_number, query_state
)
final_query_state = query_state
break
if max_tries and try_number >= max_tries: # Break loop if max_tries reached
final_query_state = query_state
break
try_number += 1
sleep(self.sleep_time)
return final_query_state
[docs] def stop_query(self, query_execution_id: str) -> Dict:
"""
Cancel the submitted athena query
:param query_execution_id: Id of submitted athena query
:type query_execution_id: str
:return: dict
"""
return self.get_conn().stop_query_execution(QueryExecutionId=query_execution_id)