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During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
254 lines
10 KiB
Python
254 lines
10 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2015, 2016 OpenMarket Ltd
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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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.
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# https://github.com/matrix-org/synapse/issues/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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# Set the statement timeout to 1 hour by default.
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# Any query taking more than 1 hour should probably be considered a bug;
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# most of the time this is a sign that work needs to be split up or that
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# some degenerate query plan has been created and the client has probably
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# timed out/walked off anyway.
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# This is in milliseconds.
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self.statement_timeout: Optional[int] = database_config.get(
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"statement_timeout", 60 * 60 * 1000
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)
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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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# Abort really long-running statements and turn them into errors.
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if self.statement_timeout is not None:
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cursor.execute("SET statement_timeout TO ?", (self.statement_timeout,))
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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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@property
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def row_id_name(self) -> str:
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return "ctid"
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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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