91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
# Copyright 2023 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Common code which will be used in SQLite and centralzed_db driver until SQLite
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driver is removed from glance.
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"""
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from contextlib import contextmanager
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import sqlite3
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from eventlet import sleep
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from eventlet import timeout
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from oslo_log import log as logging
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from glance.i18n import _LE
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LOG = logging.getLogger(__name__)
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DEFAULT_SQL_CALL_TIMEOUT = 2
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def dict_factory(cur, row):
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return {col[0]: row[idx] for idx, col in enumerate(cur.description)}
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class SqliteConnection(sqlite3.Connection):
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"""
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SQLite DB Connection handler that plays well with eventlet,
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slightly modified from Swift's similar code.
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"""
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def __init__(self, *args, **kwargs):
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self.timeout_seconds = kwargs.get('timeout', DEFAULT_SQL_CALL_TIMEOUT)
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kwargs['timeout'] = 0
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sqlite3.Connection.__init__(self, *args, **kwargs)
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def _timeout(self, call):
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with timeout.Timeout(self.timeout_seconds):
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while True:
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try:
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return call()
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except sqlite3.OperationalError as e:
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if 'locked' not in str(e):
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raise
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sleep(0.05)
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def execute(self, *args, **kwargs):
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return self._timeout(lambda: sqlite3.Connection.execute(
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self, *args, **kwargs))
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def commit(self):
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return self._timeout(lambda: sqlite3.Connection.commit(self))
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@contextmanager
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def get_db(db_path):
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"""
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Returns a context manager that produces a database connection that
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self-closes and calls rollback if an error occurs while using the
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database connection
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"""
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conn = sqlite3.connect(db_path, check_same_thread=False,
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factory=SqliteConnection)
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conn.row_factory = sqlite3.Row
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conn.text_factory = str
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conn.execute('PRAGMA synchronous = NORMAL')
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conn.execute('PRAGMA count_changes = OFF')
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conn.execute('PRAGMA temp_store = MEMORY')
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try:
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yield conn
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except sqlite3.DatabaseError as e:
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msg = _LE("Error executing SQLite call. Got error: %s") % e
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LOG.error(msg)
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conn.rollback()
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finally:
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conn.close()
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