superset celery 源码
superset celery 代码
文件路径：/superset/utils/celery.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
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# under the License.
import logging
from contextlib import contextmanager
from typing import Iterator
from sqlalchemy import create_engine
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy.pool import NullPool
from superset import app, db
logger = logging.getLogger(__name__)
# Null pool is used for the celery workers due process forking side effects.
# For more info see: https://github.com/apache/superset/issues/10530
@contextmanager
def session_scope(nullpool: bool) -> Iterator[Session]:
"""Provide a transactional scope around a series of operations."""
database_uri = app.config["SQLALCHEMY_DATABASE_URI"]
if "sqlite" in database_uri:
logger.warning(
"SQLite Database support for metadata databases will be removed \
in a future version of Superset."
)
if nullpool:
engine = create_engine(database_uri, poolclass=NullPool)
session_class = sessionmaker()
session_class.configure(bind=engine)
session = session_class()
else:
session = db.session()
session.commit() # HACK
try:
yield session
session.commit()
except SQLAlchemyError as ex:
session.rollback()
logger.exception(ex)
raise
finally:
session.close()
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