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"""
This module contains AWS Athena hook.
.. spelling:word-list::
PageIterator
"""
from __future__ import annotations
from typing import TYPE_CHECKING, Any, Collection
from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
from airflow.providers.amazon.aws.utils.waiter_with_logging import wait
if TYPE_CHECKING:
from botocore.paginate import PageIterator
[docs]MULTI_LINE_QUERY_LOG_PREFIX = "\n\t\t"
[docs]def query_params_to_string(params: dict[str, str | Collection[str]]) -> str:
result = ""
for key, value in params.items():
if key == "QueryString":
value = (
MULTI_LINE_QUERY_LOG_PREFIX + str(value).replace("\n", MULTI_LINE_QUERY_LOG_PREFIX).rstrip()
)
result += f"\t{key}: {value}\n"
return result.rstrip()
[docs]class AthenaHook(AwsBaseHook):
"""
Interact with Amazon Athena.
Provide thick wrapper around
:external+boto3:py:class:`boto3.client("athena") <Athena.Client>`.
:param log_query: Whether to log athena query and other execution params
when it's executed. Defaults to *True*.
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`
"""
[docs] FAILURE_STATES = (
"FAILED",
"CANCELLED",
)
[docs] SUCCESS_STATES = ("SUCCEEDED",)
[docs] TERMINAL_STATES = (
"SUCCEEDED",
"FAILED",
"CANCELLED",
)
def __init__(self, *args: Any, log_query: bool = True, **kwargs: Any) -> None:
super().__init__(client_type="athena", *args, **kwargs) # type: ignore
self.log_query = log_query
self.__query_results: dict[str, Any] = {}
[docs] def run_query(
self,
query: str,
query_context: dict[str, str],
result_configuration: dict[str, Any],
client_request_token: str | None = None,
workgroup: str = "primary",
) -> str:
"""
Run a Trino/Presto query on Athena with provided config.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.start_query_execution`
:param query: Trino/Presto query to run.
:param query_context: Context in which query need to be run.
:param result_configuration: Dict with path to store results in and
config related to encryption.
:param client_request_token: Unique token created by user to avoid
multiple executions of same query.
:param workgroup: Athena workgroup name, when not specified, will be ``'primary'``.
:return: Submitted query execution ID.
"""
params = {
"QueryString": query,
"QueryExecutionContext": query_context,
"ResultConfiguration": result_configuration,
"WorkGroup": workgroup,
}
if client_request_token:
params["ClientRequestToken"] = client_request_token
if self.log_query:
self.log.info("Running Query with params:\n%s", query_params_to_string(params))
response = self.get_conn().start_query_execution(**params)
query_execution_id = response["QueryExecutionId"]
self.log.info("Query execution id: %s", query_execution_id)
return query_execution_id
[docs] def get_query_info(self, query_execution_id: str, use_cache: bool = False) -> dict:
"""
Get information about a single execution of a query.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.get_query_execution`
:param query_execution_id: Id of submitted athena query
:param use_cache: If True, use execution information cache
"""
if use_cache and query_execution_id in self.__query_results:
return self.__query_results[query_execution_id]
response = self.get_conn().get_query_execution(QueryExecutionId=query_execution_id)
if use_cache:
self.__query_results[query_execution_id] = response
return response
[docs] def check_query_status(self, query_execution_id: str, use_cache: bool = False) -> str | None:
"""
Fetch the state of a submitted query.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.get_query_execution`
:param query_execution_id: Id of submitted athena query
:return: One of valid query states, or *None* if the response is
malformed.
"""
response = self.get_query_info(query_execution_id=query_execution_id, use_cache=use_cache)
state = None
try:
state = response["QueryExecution"]["Status"]["State"]
except Exception as e:
# The error is being absorbed here and is being handled by the caller.
# The error is being absorbed to implement retries.
self.log.exception(
"Exception while getting query state. Query execution id: %s, Exception: %s",
query_execution_id,
e,
)
return state
[docs] def get_state_change_reason(self, query_execution_id: str, use_cache: bool = False) -> str | None:
"""
Fetch the reason for a state change (e.g. error message). Returns None or reason string.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.get_query_execution`
:param query_execution_id: Id of submitted athena query
"""
response = self.get_query_info(query_execution_id=query_execution_id, use_cache=use_cache)
reason = None
try:
reason = response["QueryExecution"]["Status"]["StateChangeReason"]
except Exception as e:
# The error is being absorbed here and is being handled by the caller.
# The error is being absorbed to implement retries.
self.log.exception(
"Exception while getting query state change reason. Query execution id: %s, Exception: %s",
query_execution_id,
e,
)
return reason
[docs] def get_query_results(
self, query_execution_id: str, next_token_id: str | None = None, max_results: int = 1000
) -> dict | None:
"""
Fetch submitted query results.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.get_query_results`
:param query_execution_id: Id of submitted athena query
:param next_token_id: The token that specifies where to start pagination.
:param max_results: The maximum number of results (rows) to return in this request.
:return: *None* if the query is in intermediate, failed, or cancelled
state. Otherwise a dict of query outputs.
"""
query_state = self.check_query_status(query_execution_id)
if query_state is None:
self.log.error("Invalid Query state. Query execution id: %s", query_execution_id)
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 execution id: %s',
query_state,
query_execution_id,
)
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: int | None = None,
page_size: int | None = None,
starting_token: str | None = None,
) -> PageIterator | None:
"""
Fetch submitted Athena query results.
.. seealso::
- :external+boto3:py:class:`Athena.Paginator.GetQueryResults`
:param query_execution_id: Id of submitted athena query
:param max_items: The total number of items to return.
:param page_size: The size of each page.
:param starting_token: A token to specify where to start paginating.
:return: *None* if the query is in intermediate, failed, or cancelled
state. Otherwise a paginator to iterate through pages of results.
Call :meth`.build_full_result()` on the returned paginator to get all
results at once.
"""
query_state = self.check_query_status(query_execution_id)
if query_state is None:
self.log.error("Invalid Query state (null). Query execution id: %s", query_execution_id)
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 execution id: %s',
query_state,
query_execution_id,
)
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_polling_attempts: int | None = None, sleep_time: int | None = None
) -> str | None:
"""
Poll the state of a submitted query until it reaches final state.
:param query_execution_id: ID of submitted athena query
:param max_polling_attempts: Number of times to poll for query state before function exits
:param sleep_time: Time (in seconds) to wait between two consecutive query status checks.
:return: One of the final states
"""
try:
wait(
waiter=self.get_waiter("query_complete"),
waiter_delay=30 if sleep_time is None else sleep_time,
waiter_max_attempts=max_polling_attempts or 120,
args={"QueryExecutionId": query_execution_id},
failure_message=f"Error while waiting for query {query_execution_id} to complete",
status_message=f"Query execution id: {query_execution_id}, "
f"Query is still in non-terminal state",
status_args=["QueryExecution.Status.State"],
)
except AirflowException as error:
# this function does not raise errors to keep previous behavior.
self.log.warning(
"AirflowException while polling query status. Query execution id: %s, Exception: %s",
query_execution_id,
error,
)
except Exception as e:
self.log.warning(
"Unexpected exception while polling query status. Query execution id: %s, Exception: %s",
query_execution_id,
e,
)
return self.check_query_status(query_execution_id)
[docs] def get_output_location(self, query_execution_id: str) -> str:
"""
Get the output location of the query results in S3 URI format.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.get_query_execution`
:param query_execution_id: Id of submitted athena query
"""
if not query_execution_id:
raise ValueError(f"Invalid Query execution id. Query execution id: {query_execution_id}")
if not (response := self.get_query_info(query_execution_id=query_execution_id, use_cache=True)):
raise ValueError(f"Unable to get query information for execution id: {query_execution_id}")
try:
return response["QueryExecution"]["ResultConfiguration"]["OutputLocation"]
except KeyError:
self.log.error("Error retrieving OutputLocation. Query execution id: %s", query_execution_id)
raise
[docs] def stop_query(self, query_execution_id: str) -> dict:
"""
Cancel the submitted query.
.. seealso::
- :external+boto3:py:meth:`Athena.Client.stop_query_execution`
:param query_execution_id: Id of submitted athena query
"""
self.log.info("Stopping Query with executionId - %s", query_execution_id)
return self.get_conn().stop_query_execution(QueryExecutionId=query_execution_id)