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![Sean Quah](/assets/img/avatar_default.png)
#14910 fixed the regression introduced by #13873 where sqlite database migrations would no longer run inside a transaction. However, it committed the transaction before Synapse updated its bookkeeping of which migrations have been run, which means that migrations may be run again after they have completed successfully. Leave the transaction open at the end of `executescript`, to restore the old, correct behaviour. Also make the PostgreSQL behaviour consistent with SQLite. Fixes #14909. Signed-off-by: Sean Quah <seanq@matrix.org>
229 lines
9.1 KiB
Python
229 lines
9.1 KiB
Python
# Copyright 2015, 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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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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import logging
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from typing import TYPE_CHECKING, Any, Mapping, NoReturn, Optional, Tuple, cast
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import psycopg2.extensions
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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 Cursor
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if TYPE_CHECKING:
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from synapse.storage.database import LoggingDatabaseConnection
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logger = logging.getLogger(__name__)
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class PostgresEngine(
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BaseDatabaseEngine[psycopg2.extensions.connection, psycopg2.extensions.cursor]
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):
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def __init__(self, database_config: Mapping[str, Any]):
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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(_: bytes) -> NoReturn:
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raise Exception("Passing bytes to DB is disabled.")
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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: 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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psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ
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)
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self.config = database_config
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@property
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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: 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 = cast(Tuple[str, str], txn.fetchone())
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return collation, ctype
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def check_database(
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self,
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db_conn: psycopg2.extensions.connection,
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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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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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if not allow_outdated_version and self._version < 110000:
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raise RuntimeError("Synapse requires PostgreSQL 11 or above.")
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with db_conn.cursor() as txn:
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txn.execute("SHOW SERVER_ENCODING")
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rows = txn.fetchall()
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if rows and rows[0][0] != "UTF8":
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raise IncorrectDatabaseSetup(
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"Database has incorrect encoding: '%s' instead of 'UTF8'\n"
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"See docs/postgres.md for more information." % (rows[0][0],)
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)
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collation, ctype = self.get_db_locale(txn)
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if collation != "C":
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logger.warning(
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"Database has incorrect collation of %r. Should be 'C'",
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collation,
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)
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if not allow_unsafe_locale:
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raise IncorrectDatabaseSetup(
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"Database has incorrect collation of %r. Should be 'C'\n"
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"See docs/postgres.md for more information. You can override this check by"
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"setting 'allow_unsafe_locale' to true in the database config.",
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collation,
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)
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if ctype != "C":
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if not allow_unsafe_locale:
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logger.warning(
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"Database has incorrect ctype of %r. Should be 'C'",
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ctype,
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)
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raise IncorrectDatabaseSetup(
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"Database has incorrect ctype of %r. Should be 'C'\n"
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"See docs/postgres.md for more information. You can override this check by"
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"setting 'allow_unsafe_locale' to true in the database config.",
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ctype,
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)
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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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collation, ctype = self.get_db_locale(txn)
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errors = []
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if collation != "C":
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errors.append(" - 'COLLATE' is set to %r. Should be 'C'" % (collation,))
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if ctype != "C":
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errors.append(" - 'CTYPE' is set to %r. Should be 'C'" % (ctype,))
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if errors:
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raise IncorrectDatabaseSetup(
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"Database is incorrectly configured:\n\n%s\n\n"
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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: str) -> str:
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return sql.replace("?", "%s")
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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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cursor = db_conn.cursor()
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cursor.execute("SET bytea_output TO escape")
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# Asynchronous commit, don't wait for the server to call fsync before
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# ending the transaction.
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# https://www.postgresql.org/docs/current/static/wal-async-commit.html
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if not self.synchronous_commit:
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cursor.execute("SET synchronous_commit TO OFF")
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cursor.close()
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db_conn.commit()
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@property
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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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@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 True
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def is_deadlock(self, error: Exception) -> bool:
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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: psycopg2.extensions.connection) -> bool:
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return bool(conn.closed)
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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) -> 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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assert numver is not None
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# https://www.postgresql.org/docs/current/libpq-status.html#LIBPQ-PQSERVERVERSION
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if numver >= 100000:
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return "%i.%i" % (numver / 10000, numver % 10000)
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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: psycopg2.extensions.connection) -> bool:
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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.extensions.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: psycopg2.extensions.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)
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@staticmethod
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def executescript(cursor: psycopg2.extensions.cursor, script: str) -> None:
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"""Execute a chunk of SQL containing multiple semicolon-delimited statements.
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Psycopg2 seems happy to do this in DBAPI2's `execute()` function.
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For consistency with SQLite, any ongoing transaction is committed before
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executing the script in its own transaction. The script transaction is
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left open and it is the responsibility of the caller to commit it.
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"""
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cursor.execute(f"COMMIT; BEGIN TRANSACTION; {script}")
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