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Tidy up and type-hint the database engine modules (#12734)

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Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>
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David Robertson 2022-05-17 00:34:38 +01:00 committed by GitHub
parent 6d8d1218dd
commit 1fe202a1a3
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7 changed files with 182 additions and 94 deletions
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1
changelog.d/12734.misc Normal file
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@ -0,0 +1 @@
Tidy up and type-hint the database engine modules.

3
mypy.ini
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@ -232,6 +232,9 @@ disallow_untyped_defs = True
[mypy-synapse.storage.databases.main.user_erasure_store]
disallow_untyped_defs = True
[mypy-synapse.storage.engines.*]
disallow_untyped_defs = True
[mypy-synapse.storage.prepare_database]
disallow_untyped_defs = True

12
synapse/storage/engines/__init__.py
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@ -11,25 +11,21 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Any, Mapping
from ._base import BaseDatabaseEngine, IncorrectDatabaseSetup
from .postgres import PostgresEngine
from .sqlite import Sqlite3Engine
def create_engine(database_config) -> BaseDatabaseEngine:
def create_engine(database_config: Mapping[str, Any]) -> BaseDatabaseEngine:
name = database_config["name"]
if name == "sqlite3":
import sqlite3
return Sqlite3Engine(sqlite3, database_config)
return Sqlite3Engine(database_config)
if name == "psycopg2":
# Note that psycopg2cffi-compat provides the psycopg2 module on pypy.
import psycopg2
return PostgresEngine(psycopg2, database_config)
return PostgresEngine(database_config)
raise RuntimeError("Unsupported database engine '%s'" % (name,))

26
synapse/storage/engines/_base.py
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@ -13,9 +13,12 @@
# limitations under the License.
import abc
from enum import IntEnum
from typing import Generic, Optional, TypeVar
from typing import TYPE_CHECKING, Any, Generic, Mapping, Optional, TypeVar
from synapse.storage.types import Connection
from synapse.storage.types import Connection, Cursor, DBAPI2Module
if TYPE_CHECKING:
from synapse.storage.database import LoggingDatabaseConnection
class IsolationLevel(IntEnum):
@ -32,7 +35,7 @@ ConnectionType = TypeVar("ConnectionType", bound=Connection)
class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
def __init__(self, module, database_config: dict):
def __init__(self, module: DBAPI2Module, config: Mapping[str, Any]):
self.module = module
@property
@ -69,7 +72,7 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
...
@abc.abstractmethod
def check_new_database(self, txn) -> None:
def check_new_database(self, txn: Cursor) -> None:
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
@ -79,8 +82,11 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
def convert_param_style(self, sql: str) -> str:
...
# This method would ideally take a plain ConnectionType, but it seems that
# the Sqlite engine expects to use LoggingDatabaseConnection.cursor
# instead of sqlite3.Connection.cursor: only the former takes a txn_name.
@abc.abstractmethod
def on_new_connection(self, db_conn: ConnectionType) -> None:
def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
...
@abc.abstractmethod
@ -92,7 +98,7 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
...
@abc.abstractmethod
def lock_table(self, txn, table: str) -> None:
def lock_table(self, txn: Cursor, table: str) -> None:
...
@property
@ -102,12 +108,12 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
...
@abc.abstractmethod
def in_transaction(self, conn: Connection) -> bool:
def in_transaction(self, conn: ConnectionType) -> bool:
"""Whether the connection is currently in a transaction."""
...
@abc.abstractmethod
def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
def attempt_to_set_autocommit(self, conn: ConnectionType, autocommit: bool) -> None:
"""Attempt to set the connections autocommit mode.
When True queries are run outside of transactions.
@ -119,8 +125,8 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
@abc.abstractmethod
def attempt_to_set_isolation_level(
self, conn: Connection, isolation_level: Optional[int]
):
self, conn: ConnectionType, isolation_level: Optional[int]
) -> None:
"""Attempt to set the connections isolation level.
Note: This has no effect on SQLite3, as transactions are SERIALIZABLE by default.

92
synapse/storage/engines/postgres.py
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@ -13,39 +13,47 @@
# limitations under the License.
import logging
from typing import Mapping, Optional
from typing import TYPE_CHECKING, Any, Mapping, NoReturn, Optional, Tuple, cast
from synapse.storage.engines._base import (
BaseDatabaseEngine,
IncorrectDatabaseSetup,
IsolationLevel,
)
from synapse.storage.types import Connection
from synapse.storage.types import Cursor
if TYPE_CHECKING:
import psycopg2 # noqa: F401
from synapse.storage.database import LoggingDatabaseConnection
logger = logging.getLogger(__name__)
class PostgresEngine(BaseDatabaseEngine):
def __init__(self, database_module, database_config):
super().__init__(database_module, database_config)
self.module.extensions.register_type(self.module.extensions.UNICODE)
class PostgresEngine(BaseDatabaseEngine["psycopg2.connection"]):
def __init__(self, database_config: Mapping[str, Any]):
import psycopg2.extensions
super().__init__(psycopg2, database_config)
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
# Disables passing `bytes` to txn.execute, c.f. #6186. If you do
# actually want to use bytes than wrap it in `bytearray`.
def _disable_bytes_adapter(_):
def _disable_bytes_adapter(_: bytes) -> NoReturn:
raise Exception("Passing bytes to DB is disabled.")
self.module.extensions.register_adapter(bytes, _disable_bytes_adapter)
self.synchronous_commit = database_config.get("synchronous_commit", True)
self._version = None # unknown as yet
psycopg2.extensions.register_adapter(bytes, _disable_bytes_adapter)
self.synchronous_commit: bool = database_config.get("synchronous_commit", True)
self._version: Optional[int] = None # unknown as yet
self.isolation_level_map: Mapping[int, int] = {
IsolationLevel.READ_COMMITTED: self.module.extensions.ISOLATION_LEVEL_READ_COMMITTED,
IsolationLevel.REPEATABLE_READ: self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ,
IsolationLevel.SERIALIZABLE: self.module.extensions.ISOLATION_LEVEL_SERIALIZABLE,
IsolationLevel.READ_COMMITTED: psycopg2.extensions.ISOLATION_LEVEL_READ_COMMITTED,
IsolationLevel.REPEATABLE_READ: psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ,
IsolationLevel.SERIALIZABLE: psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE,
}
self.default_isolation_level = (
self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ
)
self.config = database_config
@ -53,19 +61,21 @@ class PostgresEngine(BaseDatabaseEngine):
def single_threaded(self) -> bool:
return False
def get_db_locale(self, txn):
def get_db_locale(self, txn: Cursor) -> Tuple[str, str]:
txn.execute(
"SELECT datcollate, datctype FROM pg_database WHERE datname = current_database()"
)
collation, ctype = txn.fetchone()
collation, ctype = cast(Tuple[str, str], txn.fetchone())
return collation, ctype
def check_database(self, db_conn, allow_outdated_version: bool = False):
def check_database(
self, db_conn: "psycopg2.connection", allow_outdated_version: bool = False
) -> None:
# Get the version of PostgreSQL that we're using. As per the psycopg2
# docs: The number is formed by converting the major, minor, and
# revision numbers into two-decimal-digit numbers and appending them
# together. For example, version 8.1.5 will be returned as 80105
self._version = db_conn.server_version
self._version = cast(int, db_conn.server_version)
allow_unsafe_locale = self.config.get("allow_unsafe_locale", False)
# Are we on a supported PostgreSQL version?
@ -108,7 +118,7 @@ class PostgresEngine(BaseDatabaseEngine):
ctype,
)
def check_new_database(self, txn):
def check_new_database(self, txn: Cursor) -> None:
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
@ -129,10 +139,10 @@ class PostgresEngine(BaseDatabaseEngine):
"See docs/postgres.md for more information." % ("\n".join(errors))
)
def convert_param_style(self, sql):
def convert_param_style(self, sql: str) -> str:
return sql.replace("?", "%s")
def on_new_connection(self, db_conn):
def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
db_conn.set_isolation_level(self.default_isolation_level)
# Set the bytea output to escape, vs the default of hex
@ -149,14 +159,14 @@ class PostgresEngine(BaseDatabaseEngine):
db_conn.commit()
@property
def can_native_upsert(self):
def can_native_upsert(self) -> bool:
"""
Can we use native UPSERTs?
"""
return True
@property
def supports_using_any_list(self):
def supports_using_any_list(self) -> bool:
"""Do we support using `a = ANY(?)` and passing a list"""
return True
@ -165,27 +175,25 @@ class PostgresEngine(BaseDatabaseEngine):
"""Do we support the `RETURNING` clause in insert/update/delete?"""
return True
def is_deadlock(self, error):
if isinstance(error, self.module.DatabaseError):
def is_deadlock(self, error: Exception) -> bool:
import psycopg2.extensions
if isinstance(error, psycopg2.DatabaseError):
# https://www.postgresql.org/docs/current/static/errcodes-appendix.html
# "40001" serialization_failure
# "40P01" deadlock_detected
return error.pgcode in ["40001", "40P01"]
return False
def is_connection_closed(self, conn):
def is_connection_closed(self, conn: "psycopg2.connection") -> bool:
return bool(conn.closed)
def lock_table(self, txn, table):
def lock_table(self, txn: Cursor, table: str) -> None:
txn.execute("LOCK TABLE %s in EXCLUSIVE MODE" % (table,))
@property
def server_version(self):
"""Returns a string giving the server version. For example: '8.1.5'
Returns:
string
"""
def server_version(self) -> str:
"""Returns a string giving the server version. For example: '8.1.5'."""
# note that this is a bit of a hack because it relies on check_database
# having been called. Still, that should be a safe bet here.
numver = self._version
@ -197,17 +205,21 @@ class PostgresEngine(BaseDatabaseEngine):
else:
return "%i.%i.%i" % (numver / 10000, (numver % 10000) / 100, numver % 100)
def in_transaction(self, conn: Connection) -> bool:
return conn.status != self.module.extensions.STATUS_READY # type: ignore
def in_transaction(self, conn: "psycopg2.connection") -> bool:
import psycopg2.extensions
def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
return conn.set_session(autocommit=autocommit) # type: ignore
return conn.status != psycopg2.extensions.STATUS_READY
def attempt_to_set_autocommit(
self, conn: "psycopg2.connection", autocommit: bool
) -> None:
return conn.set_session(autocommit=autocommit)
def attempt_to_set_isolation_level(
self, conn: Connection, isolation_level: Optional[int]
):
self, conn: "psycopg2.connection", isolation_level: Optional[int]
) -> None:
if isolation_level is None:
isolation_level = self.default_isolation_level
else:
isolation_level = self.isolation_level_map[isolation_level]
return conn.set_isolation_level(isolation_level) # type: ignore
return conn.set_isolation_level(isolation_level)

72
synapse/storage/engines/sqlite.py
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@ -12,21 +12,21 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import platform
import sqlite3
import struct
import threading
import typing
from typing import Optional
from typing import TYPE_CHECKING, Any, List, Mapping, Optional
from synapse.storage.engines import BaseDatabaseEngine
from synapse.storage.types import Connection
from synapse.storage.types import Cursor
if typing.TYPE_CHECKING:
import sqlite3 # noqa: F401
if TYPE_CHECKING:
from synapse.storage.database import LoggingDatabaseConnection
class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
def __init__(self, database_module, database_config):
super().__init__(database_module, database_config)
class Sqlite3Engine(BaseDatabaseEngine[sqlite3.Connection]):
def __init__(self, database_config: Mapping[str, Any]):
super().__init__(sqlite3, database_config)
database = database_config.get("args", {}).get("database")
self._is_in_memory = database in (
@ -37,7 +37,7 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
if platform.python_implementation() == "PyPy":
# pypy's sqlite3 module doesn't handle bytearrays, convert them
# back to bytes.
database_module.register_adapter(bytearray, lambda array: bytes(array))
sqlite3.register_adapter(bytearray, lambda array: bytes(array))
# The current max state_group, or None if we haven't looked
# in the DB yet.
@ -49,41 +49,43 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
return True
@property
def can_native_upsert(self):
def can_native_upsert(self) -> bool:
"""
Do we support native UPSERTs? This requires SQLite3 3.24+, plus some
more work we haven't done yet to tell what was inserted vs updated.
"""
return self.module.sqlite_version_info >= (3, 24, 0)
return sqlite3.sqlite_version_info >= (3, 24, 0)
@property
def supports_using_any_list(self):
def supports_using_any_list(self) -> bool:
"""Do we support using `a = ANY(?)` and passing a list"""
return False
@property
def supports_returning(self) -> bool:
"""Do we support the `RETURNING` clause in insert/update/delete?"""
return self.module.sqlite_version_info >= (3, 35, 0)
return sqlite3.sqlite_version_info >= (3, 35, 0)
def check_database(self, db_conn, allow_outdated_version: bool = False):
def check_database(
self, db_conn: sqlite3.Connection, allow_outdated_version: bool = False
) -> None:
if not allow_outdated_version:
version = self.module.sqlite_version_info
version = sqlite3.sqlite_version_info
# Synapse is untested against older SQLite versions, and we don't want
# to let users upgrade to a version of Synapse with broken support for their
# sqlite version, because it risks leaving them with a half-upgraded db.
if version < (3, 22, 0):
raise RuntimeError("Synapse requires sqlite 3.22 or above.")
def check_new_database(self, txn):
def check_new_database(self, txn: Cursor) -> None:
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
def convert_param_style(self, sql):
def convert_param_style(self, sql: str) -> str:
return sql
def on_new_connection(self, db_conn):
def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
# We need to import here to avoid an import loop.
from synapse.storage.prepare_database import prepare_database
@ -97,48 +99,46 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
db_conn.execute("PRAGMA foreign_keys = ON;")
db_conn.commit()
def is_deadlock(self, error):
def is_deadlock(self, error: Exception) -> bool:
return False
def is_connection_closed(self, conn):
def is_connection_closed(self, conn: sqlite3.Connection) -> bool:
return False
def lock_table(self, txn, table):
def lock_table(self, txn: Cursor, table: str) -> None:
return
@property
def server_version(self):
"""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
"""

70
synapse/storage/types.py
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@ -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"]