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from __future__ import annotations
from typing import Callable, Sequence
from airflow.exceptions import AirflowException
from airflow.providers.common.sql.operators.sql import SQLCheckOperator, SQLValueCheckOperator
from airflow.providers.qubole.hooks.qubole_check import QuboleCheckHook
from airflow.providers.qubole.operators.qubole import QuboleOperator
class _QuboleCheckOperatorMixin:
"""This is a Mixin for Qubole related check operators."""
kwargs: dict
results_parser_callable: Callable | None
def execute(self, context=None) -> None:
"""Execute a check operation against Qubole."""
try:
self._hook_context = context
super().execute(context=context) # type: ignore[misc]
except AirflowException as e:
handle_airflow_exception(e, self.get_hook())
def get_db_hook(self) -> QuboleCheckHook:
"""Get QuboleCheckHook."""
return self.get_hook()
def get_hook(self) -> QuboleCheckHook:
"""
Reinitialising the hook, as some template fields might have changed.
This method overwrites the original QuboleOperator.get_hook() which returns a QuboleHook.
"""
return QuboleCheckHook(
context=self._hook_context, results_parser_callable=self.results_parser_callable, **self.kwargs
)
[docs]class QuboleCheckOperator(_QuboleCheckOperatorMixin, SQLCheckOperator, QuboleOperator):
"""
Performs checks against Qubole Commands.
``QuboleCheckOperator`` expects a command that will be executed on QDS.
By default, each value on first row of the result of this Qubole Command
is evaluated using python ``bool`` casting. If any of the
values return ``False``, the check is failed and errors out.
Note that Python bool casting evals the following as ``False``:
* ``False``
* ``0``
* Empty string (``""``)
* Empty list (``[]``)
* Empty dictionary or set (``{}``)
Given a query like ``SELECT COUNT(*) FROM foo``, it will fail only if
the count ``== 0``. You can craft much more complex query that could,
for instance, check that the table has the same number of rows as
the source table upstream, or that the count of today's partition is
greater than yesterday's partition, or that a set of metrics are less
than 3 standard deviation for the 7 day average.
This operator can be used as a data quality check in your pipeline, and
depending on where you put it in your DAG, you have the choice to
stop the critical path, preventing from
publishing dubious data, or on the side and receive email alerts
without stopping the progress of the DAG.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:QuboleCheckOperator`
:param qubole_conn_id: Connection id which consists of qds auth_token
:param results_parser_callable: This is an optional parameter to extend the flexibility of parsing the
results of Qubole command to the users. This is a Python callable which can hold the logic to parse
list of rows returned by Qubole command. By default, only the values on first row are used for
performing checks. This callable should return a list of records on which the checks have to be
performed.
kwargs:
Arguments specific to Qubole command can be referred from QuboleOperator docs.
.. note:: All fields in common with template fields of
QuboleOperator and SQLCheckOperator are template-supported.
"""
[docs] conn_id_field = "qubole_conn_id"
[docs] template_fields: Sequence[str] = tuple(
set(QuboleOperator.template_fields) | set(SQLCheckOperator.template_fields) | {"qubole_conn_id"}
)
[docs] template_ext = QuboleOperator.template_ext
def __init__(
self,
*,
qubole_conn_id: str = "qubole_default",
results_parser_callable: Callable | None = None,
**kwargs,
) -> None:
sql = get_sql_from_qbol_cmd(kwargs)
kwargs.pop("sql", None)
super().__init__(qubole_conn_id=qubole_conn_id, sql=sql, **kwargs)
self.results_parser_callable = results_parser_callable
self.on_failure_callback = QuboleCheckHook.handle_failure_retry
self.on_retry_callback = QuboleCheckHook.handle_failure_retry
self._hook_context = None
self.qubole_conn_id = qubole_conn_id
# TODO(xinbinhuang): refactor to reduce levels of inheritance
[docs]class QuboleValueCheckOperator(_QuboleCheckOperatorMixin, SQLValueCheckOperator, QuboleOperator):
"""
Performs a simple value check using Qubole command.
By default, each value on the first row of this
Qubole command is compared with a pre-defined value.
The check fails and errors out if the output of the command
is not within the permissible limit of expected value.
:param qubole_conn_id: Connection id which consists of qds auth_token
:param pass_value: Expected value of the query results.
:param tolerance: Defines the permissible pass_value range, for example if tolerance is 2, the Qubole
command output can be anything between -2*pass_value and 2*pass_value, without the operator erring
out.
:param results_parser_callable: This is an optional parameter to extend the flexibility of parsing the
results of Qubole command to the users. This is a Python callable which can hold the logic to parse
list of rows returned by Qubole command. By default, only the values on first row are used for
performing checks. This callable should return a list of records on which the checks have to be
performed.
kwargs:
Arguments specific to Qubole command can be referred from QuboleOperator docs.
.. note:: All fields in common with template fields of
QuboleOperator and SQLValueCheckOperator are template-supported.
"""
[docs] template_fields = tuple(
set(QuboleOperator.template_fields) | set(SQLValueCheckOperator.template_fields) | {"qubole_conn_id"}
)
[docs] template_ext = QuboleOperator.template_ext
[docs] conn_id_field = "qubole_conn_id"
def __init__(
self,
*,
pass_value: str | int | float,
tolerance: int | float | None = None,
results_parser_callable: Callable | None = None,
qubole_conn_id: str = "qubole_default",
**kwargs,
) -> None:
sql = get_sql_from_qbol_cmd(kwargs)
kwargs.pop("sql", None)
super().__init__(
qubole_conn_id=qubole_conn_id, sql=sql, pass_value=pass_value, tolerance=tolerance, **kwargs
)
self.results_parser_callable = results_parser_callable
self.on_failure_callback = QuboleCheckHook.handle_failure_retry
self.on_retry_callback = QuboleCheckHook.handle_failure_retry
self._hook_context = None
self.qubole_conn_id = qubole_conn_id
[docs]def get_sql_from_qbol_cmd(params) -> str:
"""Get Qubole sql from Qubole command."""
sql = ""
if "query" in params:
sql = params["query"]
elif "sql" in params:
sql = params["sql"]
return sql
[docs]def handle_airflow_exception(airflow_exception, hook: QuboleCheckHook):
"""Qubole check handle Airflow exception."""
cmd = hook.cmd
if cmd is not None:
if cmd.is_success(cmd.status):
qubole_command_results = hook.get_query_results()
qubole_command_id = cmd.id
exception_message = (
f"\nQubole Command Id: {qubole_command_id}\nQubole Command Results:\n{qubole_command_results}"
)
raise AirflowException(str(airflow_exception) + exception_message)
raise AirflowException(str(airflow_exception))