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Db txn set isolation level (#11799)

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Co-authored-by: Brendan Abolivier <babolivier@matrix.org>
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Nick Barrett 2022-01-25 14:14:46 +00:00 • committed by GitHub
parent fc8598bc87
commit b59d285f7c
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5 changed files with 61 additions and 5 deletions
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19
synapse/storage/engines/_base.py
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@ -12,11 +12,18 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
from typing import Generic, TypeVar
from enum import IntEnum
from typing import Generic, Optional, TypeVar
from synapse.storage.types import Connection
class IsolationLevel(IntEnum):
READ_COMMITTED: int = 1
REPEATABLE_READ: int = 2
SERIALIZABLE: int = 3
class IncorrectDatabaseSetup(RuntimeError):
pass
@ -109,3 +116,13 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
commit/rollback the connections.
"""
...
@abc.abstractmethod
def attempt_to_set_isolation_level(
self, conn: Connection, isolation_level: Optional[int]
):
"""Attempt to set the connections isolation level.
Note: This has no effect on SQLite3, as transactions are SERIALIZABLE by default.
"""
...