Tidy up and type-hint the database engine modules (#12734)
Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>pull/12498/head
David Robertson
GitHub
parent
6d8d1218dd
commit
1fe202a1a3
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@ -0,0 +1 @@
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Tidy up and type-hint the database engine modules.
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3
mypy.ini
3
mypy.ini
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@ -232,6 +232,9 @@ disallow_untyped_defs = True
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[mypy-synapse.storage.databases.main.user_erasure_store]
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disallow_untyped_defs = True
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[mypy-synapse.storage.engines.*]
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disallow_untyped_defs = True
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[mypy-synapse.storage.prepare_database]
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disallow_untyped_defs = True
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@ -11,25 +11,21 @@
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Any, Mapping
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from ._base import BaseDatabaseEngine, IncorrectDatabaseSetup
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from .postgres import PostgresEngine
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from .sqlite import Sqlite3Engine
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def create_engine(database_config) -> BaseDatabaseEngine:
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def create_engine(database_config: Mapping[str, Any]) -> BaseDatabaseEngine:
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name = database_config["name"]
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if name == "sqlite3":
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import sqlite3
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return Sqlite3Engine(sqlite3, database_config)
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return Sqlite3Engine(database_config)
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if name == "psycopg2":
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# Note that psycopg2cffi-compat provides the psycopg2 module on pypy.
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import psycopg2
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return PostgresEngine(psycopg2, database_config)
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return PostgresEngine(database_config)
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raise RuntimeError("Unsupported database engine '%s'" % (name,))
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@ -13,9 +13,12 @@
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# limitations under the License.
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import abc
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from enum import IntEnum
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from typing import Generic, Optional, TypeVar
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from typing import TYPE_CHECKING, Any, Generic, Mapping, Optional, TypeVar
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from synapse.storage.types import Connection
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from synapse.storage.types import Connection, Cursor, DBAPI2Module
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if TYPE_CHECKING:
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from synapse.storage.database import LoggingDatabaseConnection
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class IsolationLevel(IntEnum):
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@ -32,7 +35,7 @@ ConnectionType = TypeVar("ConnectionType", bound=Connection)
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class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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def __init__(self, module, database_config: dict):
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def __init__(self, module: DBAPI2Module, config: Mapping[str, Any]):
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self.module = module
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@property
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@ -69,7 +72,7 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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...
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@abc.abstractmethod
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def check_new_database(self, txn) -> None:
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def check_new_database(self, txn: Cursor) -> None:
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"""Gets called when setting up a brand new database. This allows us to
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apply stricter checks on new databases versus existing database.
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"""
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@ -79,8 +82,11 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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def convert_param_style(self, sql: str) -> str:
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...
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# This method would ideally take a plain ConnectionType, but it seems that
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# the Sqlite engine expects to use LoggingDatabaseConnection.cursor
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# instead of sqlite3.Connection.cursor: only the former takes a txn_name.
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@abc.abstractmethod
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def on_new_connection(self, db_conn: ConnectionType) -> None:
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def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
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...
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@abc.abstractmethod
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@ -92,7 +98,7 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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...
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@abc.abstractmethod
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def lock_table(self, txn, table: str) -> None:
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def lock_table(self, txn: Cursor, table: str) -> None:
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...
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@property
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@ -102,12 +108,12 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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...
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@abc.abstractmethod
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def in_transaction(self, conn: Connection) -> bool:
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def in_transaction(self, conn: ConnectionType) -> bool:
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"""Whether the connection is currently in a transaction."""
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...
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@abc.abstractmethod
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def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
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def attempt_to_set_autocommit(self, conn: ConnectionType, autocommit: bool) -> None:
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"""Attempt to set the connections autocommit mode.
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When True queries are run outside of transactions.
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@ -119,8 +125,8 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
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@abc.abstractmethod
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def attempt_to_set_isolation_level(
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self, conn: Connection, isolation_level: Optional[int]
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):
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self, conn: ConnectionType, isolation_level: Optional[int]
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) -> None:
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"""Attempt to set the connections isolation level.
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Note: This has no effect on SQLite3, as transactions are SERIALIZABLE by default.
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@ -13,39 +13,47 @@
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# limitations under the License.
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import logging
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from typing import Mapping, Optional
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from typing import TYPE_CHECKING, Any, Mapping, NoReturn, Optional, Tuple, cast
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from synapse.storage.engines._base import (
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BaseDatabaseEngine,
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IncorrectDatabaseSetup,
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IsolationLevel,
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)
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from synapse.storage.types import Connection
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from synapse.storage.types import Cursor
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if TYPE_CHECKING:
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import psycopg2 # noqa: F401
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from synapse.storage.database import LoggingDatabaseConnection
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logger = logging.getLogger(__name__)
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class PostgresEngine(BaseDatabaseEngine):
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def __init__(self, database_module, database_config):
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super().__init__(database_module, database_config)
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self.module.extensions.register_type(self.module.extensions.UNICODE)
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class PostgresEngine(BaseDatabaseEngine["psycopg2.connection"]):
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def __init__(self, database_config: Mapping[str, Any]):
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import psycopg2.extensions
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super().__init__(psycopg2, database_config)
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psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
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# Disables passing `bytes` to txn.execute, c.f. #6186. If you do
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# actually want to use bytes than wrap it in `bytearray`.
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def _disable_bytes_adapter(_):
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def _disable_bytes_adapter(_: bytes) -> NoReturn:
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raise Exception("Passing bytes to DB is disabled.")
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self.module.extensions.register_adapter(bytes, _disable_bytes_adapter)
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self.synchronous_commit = database_config.get("synchronous_commit", True)
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self._version = None # unknown as yet
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psycopg2.extensions.register_adapter(bytes, _disable_bytes_adapter)
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self.synchronous_commit: bool = database_config.get("synchronous_commit", True)
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self._version: Optional[int] = None # unknown as yet
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self.isolation_level_map: Mapping[int, int] = {
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IsolationLevel.READ_COMMITTED: self.module.extensions.ISOLATION_LEVEL_READ_COMMITTED,
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IsolationLevel.REPEATABLE_READ: self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ,
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IsolationLevel.SERIALIZABLE: self.module.extensions.ISOLATION_LEVEL_SERIALIZABLE,
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IsolationLevel.READ_COMMITTED: psycopg2.extensions.ISOLATION_LEVEL_READ_COMMITTED,
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IsolationLevel.REPEATABLE_READ: psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ,
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IsolationLevel.SERIALIZABLE: psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE,
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}
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self.default_isolation_level = (
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self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
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psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ
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)
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self.config = database_config
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@ -53,19 +61,21 @@ class PostgresEngine(BaseDatabaseEngine):
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def single_threaded(self) -> bool:
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return False
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def get_db_locale(self, txn):
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def get_db_locale(self, txn: Cursor) -> Tuple[str, str]:
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txn.execute(
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"SELECT datcollate, datctype FROM pg_database WHERE datname = current_database()"
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)
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collation, ctype = txn.fetchone()
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collation, ctype = cast(Tuple[str, str], txn.fetchone())
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return collation, ctype
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def check_database(self, db_conn, allow_outdated_version: bool = False):
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def check_database(
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self, db_conn: "psycopg2.connection", allow_outdated_version: bool = False
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) -> None:
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# Get the version of PostgreSQL that we're using. As per the psycopg2
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# docs: The number is formed by converting the major, minor, and
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# revision numbers into two-decimal-digit numbers and appending them
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# together. For example, version 8.1.5 will be returned as 80105
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self._version = db_conn.server_version
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self._version = cast(int, db_conn.server_version)
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allow_unsafe_locale = self.config.get("allow_unsafe_locale", False)
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# Are we on a supported PostgreSQL version?
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@ -108,7 +118,7 @@ class PostgresEngine(BaseDatabaseEngine):
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ctype,
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)
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def check_new_database(self, txn):
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def check_new_database(self, txn: Cursor) -> None:
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"""Gets called when setting up a brand new database. This allows us to
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apply stricter checks on new databases versus existing database.
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"""
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@ -129,10 +139,10 @@ class PostgresEngine(BaseDatabaseEngine):
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"See docs/postgres.md for more information." % ("\n".join(errors))
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)
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def convert_param_style(self, sql):
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def convert_param_style(self, sql: str) -> str:
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return sql.replace("?", "%s")
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def on_new_connection(self, db_conn):
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def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
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db_conn.set_isolation_level(self.default_isolation_level)
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# Set the bytea output to escape, vs the default of hex
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@ -149,14 +159,14 @@ class PostgresEngine(BaseDatabaseEngine):
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db_conn.commit()
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@property
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def can_native_upsert(self):
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def can_native_upsert(self) -> bool:
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"""
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Can we use native UPSERTs?
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"""
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return True
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@property
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def supports_using_any_list(self):
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def supports_using_any_list(self) -> bool:
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"""Do we support using `a = ANY(?)` and passing a list"""
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return True
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@ -165,27 +175,25 @@ class PostgresEngine(BaseDatabaseEngine):
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"""Do we support the `RETURNING` clause in insert/update/delete?"""
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return True
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def is_deadlock(self, error):
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if isinstance(error, self.module.DatabaseError):
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def is_deadlock(self, error: Exception) -> bool:
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import psycopg2.extensions
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if isinstance(error, psycopg2.DatabaseError):
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# https://www.postgresql.org/docs/current/static/errcodes-appendix.html
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# "40001" serialization_failure
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# "40P01" deadlock_detected
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return error.pgcode in ["40001", "40P01"]
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return False
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def is_connection_closed(self, conn):
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def is_connection_closed(self, conn: "psycopg2.connection") -> bool:
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return bool(conn.closed)
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def lock_table(self, txn, table):
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def lock_table(self, txn: Cursor, table: str) -> None:
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txn.execute("LOCK TABLE %s in EXCLUSIVE MODE" % (table,))
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@property
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def server_version(self):
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"""Returns a string giving the server version. For example: '8.1.5'
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Returns:
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string
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"""
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def server_version(self) -> str:
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"""Returns a string giving the server version. For example: '8.1.5'."""
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# note that this is a bit of a hack because it relies on check_database
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# having been called. Still, that should be a safe bet here.
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numver = self._version
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@ -197,17 +205,21 @@ class PostgresEngine(BaseDatabaseEngine):
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else:
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return "%i.%i.%i" % (numver / 10000, (numver % 10000) / 100, numver % 100)
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def in_transaction(self, conn: Connection) -> bool:
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return conn.status != self.module.extensions.STATUS_READY # type: ignore
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def in_transaction(self, conn: "psycopg2.connection") -> bool:
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import psycopg2.extensions
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def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
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return conn.set_session(autocommit=autocommit) # type: ignore
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return conn.status != psycopg2.extensions.STATUS_READY
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def attempt_to_set_autocommit(
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self, conn: "psycopg2.connection", autocommit: bool
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) -> None:
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return conn.set_session(autocommit=autocommit)
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def attempt_to_set_isolation_level(
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self, conn: Connection, isolation_level: Optional[int]
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):
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self, conn: "psycopg2.connection", isolation_level: Optional[int]
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) -> None:
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if isolation_level is None:
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isolation_level = self.default_isolation_level
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else:
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isolation_level = self.isolation_level_map[isolation_level]
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return conn.set_isolation_level(isolation_level) # type: ignore
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return conn.set_isolation_level(isolation_level)
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@ -12,21 +12,21 @@
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import platform
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import sqlite3
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import struct
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import threading
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import typing
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from typing import Optional
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from typing import TYPE_CHECKING, Any, List, Mapping, Optional
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from synapse.storage.engines import BaseDatabaseEngine
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from synapse.storage.types import Connection
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from synapse.storage.types import Cursor
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if typing.TYPE_CHECKING:
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import sqlite3 # noqa: F401
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if TYPE_CHECKING:
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from synapse.storage.database import LoggingDatabaseConnection
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class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
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def __init__(self, database_module, database_config):
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super().__init__(database_module, database_config)
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class Sqlite3Engine(BaseDatabaseEngine[sqlite3.Connection]):
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def __init__(self, database_config: Mapping[str, Any]):
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super().__init__(sqlite3, database_config)
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database = database_config.get("args", {}).get("database")
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self._is_in_memory = database in (
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@ -37,7 +37,7 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
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if platform.python_implementation() == "PyPy":
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# pypy's sqlite3 module doesn't handle bytearrays, convert them
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# back to bytes.
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database_module.register_adapter(bytearray, lambda array: bytes(array))
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sqlite3.register_adapter(bytearray, lambda array: bytes(array))
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# The current max state_group, or None if we haven't looked
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# in the DB yet.
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@ -49,41 +49,43 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
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return True
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@property
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def can_native_upsert(self):
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def can_native_upsert(self) -> bool:
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"""
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Do we support native UPSERTs? This requires SQLite3 3.24+, plus some
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more work we haven't done yet to tell what was inserted vs updated.
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"""
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return self.module.sqlite_version_info >= (3, 24, 0)
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return sqlite3.sqlite_version_info >= (3, 24, 0)
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@property
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def supports_using_any_list(self):
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def supports_using_any_list(self) -> bool:
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"""Do we support using `a = ANY(?)` and passing a list"""
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return False
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@property
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def supports_returning(self) -> bool:
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"""Do we support the `RETURNING` clause in insert/update/delete?"""
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return self.module.sqlite_version_info >= (3, 35, 0)
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return sqlite3.sqlite_version_info >= (3, 35, 0)
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def check_database(self, db_conn, allow_outdated_version: bool = False):
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def check_database(
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self, db_conn: sqlite3.Connection, allow_outdated_version: bool = False
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) -> None:
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if not allow_outdated_version:
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version = self.module.sqlite_version_info
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version = sqlite3.sqlite_version_info
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# Synapse is untested against older SQLite versions, and we don't want
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# to let users upgrade to a version of Synapse with broken support for their
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# sqlite version, because it risks leaving them with a half-upgraded db.
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if version < (3, 22, 0):
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raise RuntimeError("Synapse requires sqlite 3.22 or above.")
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def check_new_database(self, txn):
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def check_new_database(self, txn: Cursor) -> None:
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"""Gets called when setting up a brand new database. This allows us to
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apply stricter checks on new databases versus existing database.
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"""
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def convert_param_style(self, sql):
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def convert_param_style(self, sql: str) -> str:
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return sql
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def on_new_connection(self, db_conn):
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def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
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# We need to import here to avoid an import loop.
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from synapse.storage.prepare_database import prepare_database
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@ -97,48 +99,46 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
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db_conn.execute("PRAGMA foreign_keys = ON;")
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db_conn.commit()
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def is_deadlock(self, error):
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def is_deadlock(self, error: Exception) -> bool:
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return False
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def is_connection_closed(self, conn):
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def is_connection_closed(self, conn: sqlite3.Connection) -> bool:
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return False
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def lock_table(self, txn, table):
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def lock_table(self, txn: Cursor, table: str) -> None:
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return
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@property
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def server_version(self):
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"""Gets a string giving the server version. For example: '3.22.0'
|
||||
def server_version(self) -> str:
|
||||
"""Gets a string giving the server version. For example: '3.22.0'."""
|
||||
return "%i.%i.%i" % sqlite3.sqlite_version_info
|
||||
|
||||
Returns:
|
||||
string
|
||||
"""
|
||||
return "%i.%i.%i" % self.module.sqlite_version_info
|
||||
def in_transaction(self, conn: sqlite3.Connection) -> bool:
|
||||
return conn.in_transaction
|
||||
|
||||
def in_transaction(self, conn: Connection) -> bool:
|
||||
return conn.in_transaction # type: ignore
|
||||
|
||||
def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
|
||||
def attempt_to_set_autocommit(
|
||||
self, conn: sqlite3.Connection, autocommit: bool
|
||||
) -> None:
|
||||
# Twisted doesn't let us set attributes on the connections, so we can't
|
||||
# set the connection to autocommit mode.
|
||||
pass
|
||||
|
||||
def attempt_to_set_isolation_level(
|
||||
self, conn: Connection, isolation_level: Optional[int]
|
||||
):
|
||||
# All transactions are SERIALIZABLE by default in sqllite
|
||||
self, conn: sqlite3.Connection, isolation_level: Optional[int]
|
||||
) -> None:
|
||||
# All transactions are SERIALIZABLE by default in sqlite
|
||||
pass
|
||||
|
||||
|
||||
# Following functions taken from: https://github.com/coleifer/peewee
|
||||
|
||||
|
||||
def _parse_match_info(buf):
|
||||
def _parse_match_info(buf: bytes) -> List[int]:
|
||||
bufsize = len(buf)
|
||||
return [struct.unpack("@I", buf[i : i + 4])[0] for i in range(0, bufsize, 4)]
|
||||
|
||||
|
||||
def _rank(raw_match_info):
|
||||
def _rank(raw_match_info: bytes) -> float:
|
||||
"""Handle match_info called w/default args 'pcx' - based on the example rank
|
||||
function http://sqlite.org/fts3.html#appendix_a
|
||||
"""
|
||||
|
|
|
|||
|
|
@ -94,3 +94,73 @@ class Connection(Protocol):
|
|||
traceback: Optional[TracebackType],
|
||||
) -> Optional[bool]:
|
||||
...
|
||||
|
||||
|
||||
class DBAPI2Module(Protocol):
|
||||
"""The module-level attributes that we use from PEP 249.
|
||||
|
||||
This is NOT a comprehensive stub for the entire DBAPI2."""
|
||||
|
||||
__name__: str
|
||||
|
||||
# Exceptions. See https://peps.python.org/pep-0249/#exceptions
|
||||
|
||||
# For our specific drivers:
|
||||
# - Python's sqlite3 module doesn't contains the same descriptions as the
|
||||
# DBAPI2 spec, see https://docs.python.org/3/library/sqlite3.html#exceptions
|
||||
# - Psycopg2 maps every Postgres error code onto a unique exception class which
|
||||
# extends from this hierarchy. See
|
||||
# https://docs.python.org/3/library/sqlite3.html?highlight=sqlite3#exceptions
|
||||
# https://www.postgresql.org/docs/current/errcodes-appendix.html#ERRCODES-TABLE
|
||||
Warning: Type[Exception]
|
||||
Error: Type[Exception]
|
||||
|
||||
# Errors are divided into `InterfaceError`s (something went wrong in the database
|
||||
# driver) and `DatabaseError`s (something went wrong in the database). These are
|
||||
# both subclasses of `Error`, but we can't currently express this in type
|
||||
# annotations due to https://github.com/python/mypy/issues/8397
|
||||
InterfaceError: Type[Exception]
|
||||
DatabaseError: Type[Exception]
|
||||
|
||||
# Everything below is a subclass of `DatabaseError`.
|
||||
|
||||
# Roughly: the database rejected a nonsensical value. Examples:
|
||||
# - An integer was too big for its data type.
|
||||
# - An invalid date time was provided.
|
||||
# - A string contained a null code point.
|
||||
DataError: Type[Exception]
|
||||
|
||||
# Roughly: something went wrong in the database, but it's not within the application
|
||||
# programmer's control. Examples:
|
||||
# - We failed to establish a connection to the database.
|
||||
# - The connection to the database was lost.
|
||||
# - A deadlock was detected.
|
||||
# - A serialisation failure occurred.
|
||||
# - The database ran out of resources, such as storage, memory, connections, etc.
|
||||
# - The database encountered an error from the operating system.
|
||||
OperationalError: Type[Exception]
|
||||
|
||||
# Roughly: we've given the database data which breaks a rule we asked it to enforce.
|
||||
# Examples:
|
||||
# - Stop, criminal scum! You violated the foreign key constraint
|
||||
# - Also check constraints, non-null constraints, etc.
|
||||
IntegrityError: Type[Exception]
|
||||
|
||||
# Roughly: something went wrong within the database server itself.
|
||||
InternalError: Type[Exception]
|
||||
|
||||
# Roughly: the application did something silly that needs to be fixed. Examples:
|
||||
# - We don't have permissions to do something.
|
||||
# - We tried to create a table with duplicate column names.
|
||||
# - We tried to use a reserved name.
|
||||
# - We referred to a column that doesn't exist.
|
||||
ProgrammingError: Type[Exception]
|
||||
|
||||
# Roughly: we've tried to do something that this database doesn't support.
|
||||
NotSupportedError: Type[Exception]
|
||||
|
||||
def connect(self, **parameters: object) -> Connection:
|
||||
...
|
||||
|
||||
|
||||
__all__ = ["Cursor", "Connection", "DBAPI2Module"]
|
||||
|
|
|
|||
Loading…
Reference in New Issue