Source code for airflow.models.base

# 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
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from typing import Any

from sqlalchemy import MetaData
from sqlalchemy.ext.declarative import declarative_base

from airflow.configuration import conf

[docs]SQL_ALCHEMY_SCHEMA = conf.get("core", "SQL_ALCHEMY_SCHEMA")
[docs]metadata = ( None if not SQL_ALCHEMY_SCHEMA or SQL_ALCHEMY_SCHEMA.isspace() else MetaData(schema=SQL_ALCHEMY_SCHEMA)
[docs]Base = declarative_base(metadata=metadata) # type: Any
[docs]ID_LEN = 250
# used for typing
[docs]class Operator:
"""Class just used for Typing"""
[docs]def get_id_collation_args(): """Get SQLAlchemy args to use for COLLATION""" collation = conf.get('core', '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 # # 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('core', 'sql_alchemy_conn', fallback='') if conn.startswith('mysql') or conn.startswith("mariadb"): return {'collation': 'utf8mb3_bin'} return {}
[docs]COLLATION_ARGS = get_id_collation_args()

Was this entry helpful?