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59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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import logging
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from contextlib import contextmanager
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from typing import Iterator
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from sqlalchemy import create_engine
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from sqlalchemy.exc import SQLAlchemyError
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from sqlalchemy.orm import Session, sessionmaker
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from sqlalchemy.pool import NullPool
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from superset import app, db
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logger = logging.getLogger(__name__)
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# Null pool is used for the celery workers due process forking side effects.
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# For more info see: https://github.com/apache/superset/issues/10530
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@contextmanager
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def session_scope(nullpool: bool) -> Iterator[Session]:
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"""Provide a transactional scope around a series of operations."""
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database_uri = app.config["SQLALCHEMY_DATABASE_URI"]
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if "sqlite" in database_uri:
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logger.warning(
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"SQLite Database support for metadata databases will be removed \
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in a future version of Superset."
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)
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if nullpool:
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engine = create_engine(database_uri, poolclass=NullPool)
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session_class = sessionmaker()
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session_class.configure(bind=engine)
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session = session_class()
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else:
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session = db.session()
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session.commit() # HACK
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try:
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yield session
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session.commit()
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except SQLAlchemyError as ex:
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session.rollback()
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logger.exception(ex)
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raise
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finally:
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session.close()
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