airflow db_callback_request 源码
airflow db_callback_request 代码
文件路径：/airflow/models/db_callback_request.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
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# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
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from __future__ import annotations
from importlib import import_module
from sqlalchemy import Column, Integer, String
from airflow.callbacks.callback_requests import CallbackRequest
from airflow.models.base import Base
from airflow.utils import timezone
from airflow.utils.sqlalchemy import ExtendedJSON, UtcDateTime
class DbCallbackRequest(Base):
"""Used to handle callbacks through database."""
__tablename__ = "callback_request"
id = Column(Integer(), nullable=False, primary_key=True)
created_at = Column(UtcDateTime, default=timezone.utcnow, nullable=False)
priority_weight = Column(Integer(), nullable=False)
callback_data = Column(ExtendedJSON, nullable=False)
callback_type = Column(String(20), nullable=False)
processor_subdir = Column(String(2000), nullable=True)
def __init__(self, priority_weight: int, callback: CallbackRequest):
self.created_at = timezone.utcnow()
self.priority_weight = priority_weight
self.processor_subdir = callback.processor_subdir
self.callback_data = callback.to_json()
self.callback_type = callback.__class__.__name__
def get_callback_request(self) -> CallbackRequest:
module = import_module("airflow.callbacks.callback_requests")
callback_class = getattr(module, self.callback_type)
# Get the function (from the instance) that we need to call
from_json = getattr(callback_class, 'from_json')
return from_json(self.callback_data)
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