mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-23 03:59:22 -05:00
112 lines
4.0 KiB
Python
112 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
# 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.
|
|
|
|
from ._base import IncorrectDatabaseSetup
|
|
|
|
|
|
class PostgresEngine(object):
|
|
single_threaded = False
|
|
|
|
def __init__(self, database_module, database_config):
|
|
self.module = database_module
|
|
self.module.extensions.register_type(self.module.extensions.UNICODE)
|
|
self.synchronous_commit = database_config.get("synchronous_commit", True)
|
|
self._version = None # unknown as yet
|
|
|
|
def check_database(self, 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.rst for more information." % (rows[0][0],)
|
|
)
|
|
|
|
def convert_param_style(self, sql):
|
|
return sql.replace("?", "%s")
|
|
|
|
def on_new_connection(self, db_conn):
|
|
|
|
# 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
|
|
|
|
# Are we on a supported PostgreSQL version?
|
|
if self._version < 90500:
|
|
raise RuntimeError("Synapse requires PostgreSQL 9.5+ or above.")
|
|
|
|
db_conn.set_isolation_level(
|
|
self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
|
|
)
|
|
|
|
# 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()
|
|
|
|
@property
|
|
def can_native_upsert(self):
|
|
"""
|
|
Can we use native UPSERTs?
|
|
"""
|
|
return True
|
|
|
|
def is_deadlock(self, error):
|
|
if isinstance(error, self.module.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):
|
|
return bool(conn.closed)
|
|
|
|
def lock_table(self, txn, table):
|
|
txn.execute("LOCK TABLE %s in EXCLUSIVE MODE" % (table,))
|
|
|
|
def get_next_state_group_id(self, txn):
|
|
"""Returns an int that can be used as a new state_group ID
|
|
"""
|
|
txn.execute("SELECT nextval('state_group_id_seq')")
|
|
return txn.fetchone()[0]
|
|
|
|
@property
|
|
def server_version(self):
|
|
"""Returns a string giving the server version. For example: '8.1.5'
|
|
|
|
Returns:
|
|
string
|
|
"""
|
|
# note that this is a bit of a hack because it relies on on_new_connection
|
|
# having been called at least once. 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)
|