airflow valid_state_dep 源码
airflow valid_state_dep 代码
文件路径：/airflow/ti_deps/deps/valid_state_dep.py
#
# 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 airflow.exceptions import AirflowException
from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.utils.session import provide_session
class ValidStateDep(BaseTIDep):
"""
Ensures that the task instance's state is in a given set of valid states.
:param valid_states: A list of valid states that a task instance can have to meet
this dependency.
:return: whether or not the task instance's state is valid
"""
NAME = "Task Instance State"
IGNORABLE = True
def __init__(self, valid_states):
super().__init__()
if not valid_states:
raise AirflowException('ValidStatesDep received an empty set of valid states.')
self._valid_states = valid_states
def __eq__(self, other):
return isinstance(self, type(other)) and self._valid_states == other._valid_states
def __hash__(self):
return hash((type(self), tuple(self._valid_states)))
@provide_session
def _get_dep_statuses(self, ti, session, dep_context):
if dep_context.ignore_ti_state:
yield self._passing_status(reason="Context specified that state should be ignored.")
return
if ti.state in self._valid_states:
yield self._passing_status(reason=f"Task state {ti.state} was valid.")
return
yield self._failing_status(reason=f"Task is in the '{ti.state}' state.")
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