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Separate engines via subclassing.

clokep/psycopg3
Patrick Cloke 2023-09-22 14:24:31 -04:00
parent 8bb700e9ac
commit be042ce2c6
4 changed files with 130 additions and 223 deletions
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7
synapse/storage/engines/__init__.py
View File

@ -14,6 +14,7 @@
from typing import Any, Mapping, NoReturn, cast
from ._base import BaseDatabaseEngine, IncorrectDatabaseSetup
from .postgres import PostgresEngine
# The classes `PostgresEngine` and `Sqlite3Engine` must always be importable, because
@ -32,9 +33,9 @@ def dummy_engine(name: str, module: str) -> BaseDatabaseEngine:
try:
from .postgres import PostgresEngine
from .psycopg2 import Psycopg2Engine
except ImportError:
PostgresEngine = dummy_engine("PostgresEngine", "psycopg2") # type: ignore[misc,assignment]
Psycopg2Engine = dummy_engine("Psycopg2Engine", "psycopg2") # type: ignore[misc,assignment]
try:
from .psycopg import PsycopgEngine
@ -54,7 +55,7 @@ def create_engine(database_config: Mapping[str, Any]) -> BaseDatabaseEngine:
return Sqlite3Engine(database_config)
if name == "psycopg2":
return PostgresEngine(database_config)
return Psycopg2Engine(database_config)
if name == "psycopg":
return PsycopgEngine(database_config)

80
synapse/storage/engines/postgres.py
View File

@ -12,17 +12,19 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import logging
from typing import TYPE_CHECKING, Any, Mapping, NoReturn, Optional, Tuple, cast
from typing import TYPE_CHECKING, Any, Mapping, Optional, Tuple, Type, cast
import psycopg2.extensions
from psycopg import sql
from synapse.storage.engines._base import (
BaseDatabaseEngine,
ConnectionType,
CursorType,
IncorrectDatabaseSetup,
IsolationLevel,
)
from synapse.storage.types import Cursor
from synapse.storage.types import Cursor, DBAPI2Module
if TYPE_CHECKING:
from synapse.storage.database import LoggingDatabaseConnection
@ -31,19 +33,14 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
class PostgresEngine(
BaseDatabaseEngine[psycopg2.extensions.connection, psycopg2.extensions.cursor]
):
def __init__(self, database_config: Mapping[str, Any]):
super().__init__(psycopg2, database_config)
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
class PostgresEngine(BaseDatabaseEngine[ConnectionType, CursorType], metaclass=abc.ABCMeta):
isolation_level_map: Mapping[int, int]
default_isolation_level: int
OperationalError: Type[Exception]
# 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(_: bytes) -> NoReturn:
raise Exception("Passing bytes to DB is disabled.")
def __init__(self, module: DBAPI2Module, database_config: Mapping[str, Any]):
super().__init__(module, database_config)
psycopg2.extensions.register_adapter(bytes, _disable_bytes_adapter)
self.synchronous_commit: bool = database_config.get("synchronous_commit", True)
# Set the statement timeout to 1 hour by default.
# Any query taking more than 1 hour should probably be considered a bug;
@ -56,16 +53,15 @@ class PostgresEngine(
)
self._version: Optional[int] = None # unknown as yet
self.isolation_level_map: Mapping[int, int] = {
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 = (
psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ
)
self.config = database_config
@abc.abstractmethod
def get_server_version(self, db_conn: ConnectionType) -> int:
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
...
@property
def single_threaded(self) -> bool:
return False
@ -79,14 +75,14 @@ class PostgresEngine(
def check_database(
self,
db_conn: psycopg2.extensions.connection,
db_conn: ConnectionType,
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 = self.get_server_version(db_conn)
allow_unsafe_locale = self.config.get("allow_unsafe_locale", False)
# Are we on a supported PostgreSQL version?
@ -154,7 +150,7 @@ class PostgresEngine(
return sql.replace("?", "%s")
def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
db_conn.set_isolation_level(self.default_isolation_level)
self.attempt_to_set_isolation_level(db_conn.conn, self.default_isolation_level)
# Set the bytea output to escape, vs the default of hex
cursor = db_conn.cursor()
@ -168,7 +164,8 @@ class PostgresEngine(
# Abort really long-running statements and turn them into errors.
if self.statement_timeout is not None:
cursor.execute("SET statement_timeout TO ?", (self.statement_timeout,))
cursor.execute(sql.SQL("SET statement_timeout TO {}").format(self.statement_timeout))
#cursor.execute("SELECT set_config( 'statement_timeout', ?, false)", (self.statement_timeout,))
cursor.close()
db_conn.commit()
@ -193,15 +190,7 @@ class PostgresEngine(
"""Do we support the `CREATE SEQUENCE` clause?"""
return True
def is_deadlock(self, error: Exception) -> bool:
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: psycopg2.extensions.connection) -> bool:
def is_connection_closed(self, conn: ConnectionType) -> bool:
return bool(conn.closed)
def lock_table(self, txn: Cursor, table: str) -> None:
@ -225,25 +214,8 @@ class PostgresEngine(
def row_id_name(self) -> str:
return "ctid"
def in_transaction(self, conn: psycopg2.extensions.connection) -> bool:
return conn.status != psycopg2.extensions.STATUS_READY
def attempt_to_set_autocommit(
self, conn: psycopg2.extensions.connection, autocommit: bool
) -> None:
return conn.set_session(autocommit=autocommit)
def attempt_to_set_isolation_level(
self, conn: psycopg2.extensions.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)
@staticmethod
def executescript(cursor: psycopg2.extensions.cursor, script: str) -> None:
def executescript(cursor: CursorType, script: str) -> None:
"""Execute a chunk of SQL containing multiple semicolon-delimited statements.
Psycopg2 seems happy to do this in DBAPI2's `execute()` function.

174
synapse/storage/engines/psycopg.py
View File

@ -13,27 +13,27 @@
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Any, Mapping, Optional, Tuple, cast
from typing import TYPE_CHECKING, Any, Mapping, Optional
import psycopg
import psycopg.errors
import psycopg.sql
from synapse.storage.engines import PostgresEngine
from synapse.storage.engines._base import (
BaseDatabaseEngine,
IncorrectDatabaseSetup,
IsolationLevel,
)
from synapse.storage.types import Cursor
if TYPE_CHECKING:
from synapse.storage.database import LoggingDatabaseConnection
pass
logger = logging.getLogger(__name__)
class PsycopgEngine(BaseDatabaseEngine[psycopg.Connection, psycopg.Cursor]):
class PsycopgEngine(PostgresEngine[psycopg.Connection, psycopg.Cursor]):
OperationalError = psycopg.OperationalError
def __init__(self, database_config: Mapping[str, Any]):
super().__init__(psycopg, database_config)
# psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
@ -43,101 +43,15 @@ class PsycopgEngine(BaseDatabaseEngine[psycopg.Connection, psycopg.Cursor]):
# def _disable_bytes_adapter(_: bytes) -> NoReturn:
# raise Exception("Passing bytes to DB is disabled.")
# 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, psycopg.IsolationLevel] = {
IsolationLevel.READ_COMMITTED: psycopg.IsolationLevel.READ_COMMITTED,
IsolationLevel.REPEATABLE_READ: psycopg.IsolationLevel.REPEATABLE_READ,
IsolationLevel.SERIALIZABLE: psycopg.IsolationLevel.SERIALIZABLE,
}
self.default_isolation_level = psycopg.IsolationLevel.REPEATABLE_READ
self.config = database_config
@property
def single_threaded(self) -> bool:
return False
def get_db_locale(self, txn: Cursor) -> Tuple[str, str]:
txn.execute(
"SELECT datcollate, datctype FROM pg_database WHERE datname = current_database()"
)
collation, ctype = cast(Tuple[str, str], txn.fetchone())
return collation, ctype
def check_database(
self,
db_conn: psycopg.Connection,
allow_outdated_version: bool = False,
) -> None:
# Get the version of PostgreSQL that we're using. As per the psycopg
# 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.info.server_version
allow_unsafe_locale = self.config.get("allow_unsafe_locale", False)
# Are we on a supported PostgreSQL version?
if not allow_outdated_version and self._version < 100000:
raise RuntimeError("Synapse requires PostgreSQL 10 or above.")
with db_conn.cursor() as txn:
txn.execute("SHOW SERVER_ENCODING")
rows = txn.fetchall()
if rows and rows[0][0] != "UTF8":
raise IncorrectDatabaseSetup(
"Database has incorrect encoding: '%s' instead of 'UTF8'\n"
"See docs/postgres.md for more information." % (rows[0][0],)
)
collation, ctype = self.get_db_locale(txn)
if collation != "C":
logger.warning(
"Database has incorrect collation of %r. Should be 'C'",
collation,
)
if not allow_unsafe_locale:
raise IncorrectDatabaseSetup(
"Database has incorrect collation of %r. Should be 'C'\n"
"See docs/postgres.md for more information. You can override this check by"
"setting 'allow_unsafe_locale' to true in the database config.",
collation,
)
if ctype != "C":
if not allow_unsafe_locale:
logger.warning(
"Database has incorrect ctype of %r. Should be 'C'",
ctype,
)
raise IncorrectDatabaseSetup(
"Database has incorrect ctype of %r. Should be 'C'\n"
"See docs/postgres.md for more information. You can override this check by"
"setting 'allow_unsafe_locale' to true in the database config.",
ctype,
)
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.
"""
collation, ctype = self.get_db_locale(txn)
errors = []
if collation != "C":
errors.append(" - 'COLLATE' is set to %r. Should be 'C'" % (collation,))
if ctype != "C":
errors.append(" - 'CTYPE' is set to %r. Should be 'C'" % (ctype,))
if errors:
raise IncorrectDatabaseSetup(
"Database is incorrectly configured:\n\n%s\n\n"
"See docs/postgres.md for more information." % ("\n".join(errors))
)
def get_server_version(self, db_conn: psycopg.Connection) -> int:
return db_conn.info.server_version
def convert_param_style(self, sql: str) -> str:
if isinstance(sql, psycopg.sql.Composed):
@ -145,42 +59,6 @@ class PsycopgEngine(BaseDatabaseEngine[psycopg.Connection, psycopg.Cursor]):
return sql.replace("?", "%s")
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
cursor = db_conn.cursor()
cursor.execute("SET bytea_output TO escape")
# Asynchronous commit, don't wait for the server to call fsync before
# ending the transaction.
# https://www.postgresql.org/docs/current/static/wal-async-commit.html
if not self.synchronous_commit:
cursor.execute("SET synchronous_commit TO OFF")
cursor.close()
db_conn.commit()
@property
def supports_using_any_list(self) -> bool:
"""Do we support using `a = ANY(?)` and passing a list"""
return True
@property
def supports_returning(self) -> bool:
"""Do we support the `RETURNING` clause in insert/update/delete?"""
return True
@property
def supports_select_distinct_on(self) -> bool:
"""Do we support the `DISTINCT ON` clause in SELECT?"""
return True
@property
def supports_sequences(self) -> bool:
"""Do we support the `CREATE SEQUENCE` clause?"""
return True
def is_deadlock(self, error: Exception) -> bool:
if isinstance(error, psycopg.errors.Error):
# https://www.postgresql.org/docs/current/static/errcodes-appendix.html
@ -189,30 +67,6 @@ class PsycopgEngine(BaseDatabaseEngine[psycopg.Connection, psycopg.Cursor]):
return error.sqlstate in ["40001", "40P01"]
return False
def is_connection_closed(self, conn: psycopg.Connection) -> bool:
return bool(conn.closed)
def lock_table(self, txn: Cursor, table: str) -> None:
txn.execute("LOCK TABLE %s in EXCLUSIVE MODE" % (table,))
@property
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
assert numver is not None
# https://www.postgresql.org/docs/current/libpq-status.html#LIBPQ-PQSERVERVERSION
if numver >= 100000:
return "%i.%i" % (numver / 10000, numver % 10000)
else:
return "%i.%i.%i" % (numver / 10000, (numver % 10000) / 100, numver % 100)
@property
def row_id_name(self) -> str:
return "ctid"
def in_transaction(self, conn: psycopg.Connection) -> bool:
return conn.info.transaction_status != psycopg.pq.TransactionStatus.IDLE
@ -229,15 +83,3 @@ class PsycopgEngine(BaseDatabaseEngine[psycopg.Connection, psycopg.Cursor]):
else:
pg_isolation_level = self.isolation_level_map[isolation_level]
conn.isolation_level = pg_isolation_level
@staticmethod
def executescript(cursor: psycopg.Cursor, script: str) -> None:
"""Execute a chunk of SQL containing multiple semicolon-delimited statements.
Psycopg seems happy to do this in DBAPI2's `execute()` function.
For consistency with SQLite, any ongoing transaction is committed before
executing the script in its own transaction. The script transaction is
left open and it is the responsibility of the caller to commit it.
"""
cursor.execute(f"COMMIT; BEGIN TRANSACTION; {script}")

92
synapse/storage/engines/psycopg2.py Normal file
View File

@ -0,0 +1,92 @@
# Copyright 2015, 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# 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.
import logging
from typing import TYPE_CHECKING, Any, Mapping, Optional
import psycopg2.extensions
from synapse.storage.engines import PostgresEngine
from synapse.storage.engines._base import (
IsolationLevel,
)
if TYPE_CHECKING:
pass
logger = logging.getLogger(__name__)
class Psycopg2Engine(
PostgresEngine[psycopg2.extensions.connection, psycopg2.extensions.cursor]
):
OperationalError = psycopg2.OperationalError
def __init__(self, database_config: Mapping[str, Any]):
super().__init__(psycopg2, database_config)
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
self.isolation_level_map: Mapping[int, int] = {
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 = (
psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ
)
self.config = database_config
def get_server_version(self, db_conn: psycopg2.extensions.connection) -> int:
return db_conn.server_version
def convert_param_style(self, sql: str) -> str:
return sql.replace("?", "%s")
def is_deadlock(self, error: Exception) -> bool:
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 in_transaction(self, conn: psycopg2.extensions.connection) -> bool:
return conn.status != psycopg2.extensions.STATUS_READY
def attempt_to_set_autocommit(
self, conn: psycopg2.extensions.connection, autocommit: bool
) -> None:
return conn.set_session(autocommit=autocommit)
def attempt_to_set_isolation_level(
self, conn: psycopg2.extensions.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)
@staticmethod
def executescript(cursor: psycopg2.extensions.cursor, script: str) -> None:
"""Execute a chunk of SQL containing multiple semicolon-delimited statements.
Psycopg2 seems happy to do this in DBAPI2's `execute()` function.
For consistency with SQLite, any ongoing transaction is committed before
executing the script in its own transaction. The script transaction is
left open and it is the responsibility of the caller to commit it.
"""
cursor.execute(f"COMMIT; BEGIN TRANSACTION; {script}")