airflow base 源码
airflow base 代码
文件路径：/airflow/models/base.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 typing import Any
from sqlalchemy import MetaData, String
from sqlalchemy.ext.declarative import declarative_base
from airflow.configuration import conf
SQL_ALCHEMY_SCHEMA = conf.get("database", "SQL_ALCHEMY_SCHEMA")
# For more information about what the tokens in the naming convention
# below mean, see:
# https://docs.sqlalchemy.org/en/14/core/metadata.html#sqlalchemy.schema.MetaData.params.naming_convention
naming_convention = {
"ix": "idx_%(column_0_N_label)s",
"uq": "%(table_name)s_%(column_0_N_name)s_uq",
"ck": "ck_%(table_name)s_%(constraint_name)s",
"fk": "%(table_name)s_%(column_0_name)s_fkey",
"pk": "%(table_name)s_pkey",
}
def _get_schema():
if not SQL_ALCHEMY_SCHEMA or SQL_ALCHEMY_SCHEMA.isspace():
return None
return SQL_ALCHEMY_SCHEMA
metadata = MetaData(schema=_get_schema(), naming_convention=naming_convention)
Base: Any = declarative_base(metadata=metadata)
ID_LEN = 250
def get_id_collation_args():
"""Get SQLAlchemy args to use for COLLATION"""
collation = conf.get('database', 'sql_engine_collation_for_ids', fallback=None)
if collation:
return {'collation': collation}
else:
# Automatically use utf8mb3_bin collation for mysql
# This is backwards-compatible. All our IDS are ASCII anyway so even if
# we migrate from previously installed database with different collation and we end up mixture of
# COLLATIONS, it's not a problem whatsoever (and we keep it small enough so that our indexes
# for MYSQL will not exceed the maximum index size.
#
# See https://github.com/apache/airflow/pull/17603#issuecomment-901121618.
#
# We cannot use session/dialect as at this point we are trying to determine the right connection
# parameters, so we use the connection
conn = conf.get('database', 'sql_alchemy_conn', fallback='')
if conn.startswith('mysql') or conn.startswith("mariadb"):
return {'collation': 'utf8mb3_bin'}
return {}
COLLATION_ARGS = get_id_collation_args()
def StringID(*, length=ID_LEN, **kwargs) -> String:
return String(length=length, **kwargs, **COLLATION_ARGS)
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