/
setup_teardown.py
132 lines (117 loc) · 5.77 KB
/
setup_teardown.py
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from airflow.models.operator import Operator
class SetupTeardownContext:
"""Context manager for setup/teardown tasks."""
_context_managed_setup_task: Operator | None = None
_previous_context_managed_setup_task: list[Operator] = []
_context_managed_teardown_task: Operator | None = None
_previous_context_managed_teardown_task: list[Operator] = []
active: bool = False
context_map: dict[Operator, list[Operator]] = {}
@classmethod
def push_context_managed_setup_task(cls, task: Operator):
if cls._context_managed_setup_task:
cls._previous_context_managed_setup_task.append(cls._context_managed_setup_task)
cls._context_managed_setup_task = task
@classmethod
def push_context_managed_teardown_task(cls, task: Operator):
if cls._context_managed_teardown_task:
cls._previous_context_managed_teardown_task.append(cls._context_managed_teardown_task)
cls._context_managed_teardown_task = task
@classmethod
def pop_context_managed_setup_task(cls) -> Operator | None:
old_setup_task = cls._context_managed_setup_task
if cls._previous_context_managed_setup_task:
cls._context_managed_setup_task = cls._previous_context_managed_setup_task.pop()
if cls._context_managed_setup_task and old_setup_task:
cls._context_managed_setup_task.set_downstream(old_setup_task)
else:
cls._context_managed_setup_task = None
return old_setup_task
@classmethod
def update_context_map(cls, operator):
setup_task = SetupTeardownContext.get_context_managed_setup_task()
teardown_task = SetupTeardownContext.get_context_managed_teardown_task()
ctx = SetupTeardownContext.context_map
if setup_task:
if ctx.get(setup_task) is None:
ctx[setup_task] = [operator]
else:
ctx[setup_task].append(operator)
if teardown_task:
if ctx.get(teardown_task) is None:
ctx[teardown_task] = [operator]
else:
ctx[teardown_task].append(operator)
@classmethod
def pop_context_managed_teardown_task(cls) -> Operator | None:
old_teardown_task = cls._context_managed_teardown_task
if cls._previous_context_managed_teardown_task:
cls._context_managed_teardown_task = cls._previous_context_managed_teardown_task.pop()
if cls._context_managed_teardown_task and old_teardown_task:
cls._context_managed_teardown_task.set_upstream(old_teardown_task)
else:
cls._context_managed_teardown_task = None
return old_teardown_task
@classmethod
def get_context_managed_setup_task(cls) -> Operator | None:
return cls._context_managed_setup_task
@classmethod
def get_context_managed_teardown_task(cls) -> Operator | None:
return cls._context_managed_teardown_task
@classmethod
def push_setup_teardown_task(cls, operator):
if operator.is_teardown:
SetupTeardownContext.push_context_managed_teardown_task(operator)
upstream_setup = [task for task in operator.upstream_list if task.is_setup]
if upstream_setup:
SetupTeardownContext.push_context_managed_setup_task(upstream_setup[-1])
elif operator.is_setup:
SetupTeardownContext.push_context_managed_setup_task(operator)
downstream_teardown = [task for task in operator.downstream_list if task.is_teardown]
if downstream_teardown:
SetupTeardownContext.push_context_managed_teardown_task(downstream_teardown[0])
SetupTeardownContext.active = True
@classmethod
def set_work_task_roots_and_leaves(cls):
setup_task = cls.get_context_managed_setup_task()
teardown_task = cls.get_context_managed_teardown_task()
if setup_task:
tasks_in_context = cls.context_map.get(setup_task, [])
if tasks_in_context:
roots = [task for task in tasks_in_context if not task.upstream_list]
if not roots:
setup_task.set_downstream(tasks_in_context[0])
else:
setup_task.set_downstream(roots)
if teardown_task:
tasks_in_context = cls.context_map.get(teardown_task, [])
if tasks_in_context:
leaves = [task for task in tasks_in_context if not task.downstream_list]
if not leaves:
teardown_task.set_upstream(tasks_in_context[-1])
else:
teardown_task.set_upstream(leaves)
setup_task = SetupTeardownContext.pop_context_managed_setup_task()
teardown_task = SetupTeardownContext.pop_context_managed_teardown_task()
SetupTeardownContext.active = False
SetupTeardownContext.context_map.pop(setup_task, None)
SetupTeardownContext.context_map.pop(teardown_task, None)