Copy PostgresEngine.
Patrick Cloke
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# 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(BaseDatabaseEngine[psycopg2.extensions.connection]):
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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 = 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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if not allow_outdated_version and self._version < 100000:
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raise RuntimeError("Synapse requires PostgreSQL 10 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 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) -> 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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