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# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
#
# 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 argparse
import logging
import os
from synapse.config._base import Config, ConfigError
logger = logging.getLogger(__name__)
NON_SQLITE_DATABASE_PATH_WARNING = """\
Ignoring 'database_path' setting: not using a sqlite3 database.
--------------------------------------------------------------------------------
"""
DEFAULT_CONFIG = """\
## Database ##
# The 'database' setting defines the database that synapse uses to store all of
# its data.
#
# 'name' gives the database engine to use: either 'sqlite3' (for SQLite) or
# 'psycopg2' (for PostgreSQL).
#
# 'txn_limit' gives the maximum number of transactions to run per connection
# before reconnecting. Defaults to 0, which means no limit.
#
# 'allow_unsafe_locale' is an option specific to Postgres. Under the default behavior, Synapse will refuse to
# start if the postgres db is set to a non-C locale. You can override this behavior (which is *not* recommended)
# by setting 'allow_unsafe_locale' to true. Note that doing so may corrupt your database. You can find more information
# here: https://matrix-org.github.io/synapse/latest/postgres.html#fixing-incorrect-collate-or-ctype and here:
# https://wiki.postgresql.org/wiki/Locale_data_changes
#
# 'args' gives options which are passed through to the database engine,
# except for options starting 'cp_', which are used to configure the Twisted
# connection pool. For a reference to valid arguments, see:
# * for sqlite: https://docs.python.org/3/library/sqlite3.html#sqlite3.connect
# * for postgres: https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS
# * for the connection pool: https://twistedmatrix.com/documents/current/api/twisted.enterprise.adbapi.ConnectionPool.html#__init__
#
#
# Example SQLite configuration:
#
#database:
# name: sqlite3
# args:
# database: /path/to/homeserver.db
#
#
# Example Postgres configuration:
#
#database:
# name: psycopg2
# txn_limit: 10000
# args:
# user: synapse_user
# password: secretpassword
# database: synapse
# host: localhost
# port: 5432
# cp_min: 5
# cp_max: 10
#
# For more information on using Synapse with Postgres,
# see https://matrix-org.github.io/synapse/latest/postgres.html.
#
database:
name: sqlite3
args:
database: %(database_path)s
"""
class DatabaseConnectionConfig:
"""Contains the connection config for a particular database.
Args:
name: A label for the database, used for logging.
db_config: The config for a particular database, as per `database`
section of main config. Has three fields: `name` for database
module name, `args` for the args to give to the database
connector, and optional `data_stores` that is a list of stores to
provision on this database (defaulting to all).
"""
def __init__(self, name: str, db_config: dict):
db_engine = db_config.get("name", "sqlite3")
if db_engine not in ("sqlite3", "psycopg2"):
raise ConfigError("Unsupported database type %r" % (db_engine,))
if db_engine == "sqlite3":
db_config.setdefault("args", {}).update(
{"cp_min": 1, "cp_max": 1, "check_same_thread": False}
)
data_stores = db_config.get("data_stores")
if data_stores is None:
data_stores = ["main", "state"]
self.name = name
self.config = db_config
# The `data_stores` config is actually talking about `databases` (we
# changed the name).
self.databases = data_stores
class DatabaseConfig(Config):
section = "database"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.databases = []
def read_config(self, config, **kwargs) -> None:
# We *experimentally* support specifying multiple databases via the
# `databases` key. This is a map from a label to database config in the
# same format as the `database` config option, plus an extra
# `data_stores` key to specify which data store goes where. For example:
#
# databases:
# master:
# name: psycopg2
# data_stores: ["main"]
# args: {}
# state:
# name: psycopg2
# data_stores: ["state"]
# args: {}
multi_database_config = config.get("databases")
database_config = config.get("database")
database_path = config.get("database_path")
if multi_database_config and database_config:
raise ConfigError("Can't specify both 'database' and 'databases' in config")
if multi_database_config:
if database_path:
raise ConfigError("Can't specify 'database_path' with 'databases'")
self.databases = [
DatabaseConnectionConfig(name, db_conf)
for name, db_conf in multi_database_config.items()
]
if database_config:
self.databases = [DatabaseConnectionConfig("master", database_config)]
if database_path:
if self.databases and self.databases[0].name != "sqlite3":
logger.warning(NON_SQLITE_DATABASE_PATH_WARNING)
return
database_config = {"name": "sqlite3", "args": {}}
self.databases = [DatabaseConnectionConfig("master", database_config)]
self.set_databasepath(database_path)
def generate_config_section(self, data_dir_path, **kwargs) -> str:
return DEFAULT_CONFIG % {
"database_path": os.path.join(data_dir_path, "homeserver.db")
}
def read_arguments(self, args: argparse.Namespace) -> None:
"""
Cases for the cli input:
- If no databases are configured and no database_path is set, raise.
- No databases and only database_path available ==> sqlite3 db.
- If there are multiple databases and a database_path raise an error.
- If the database set in the config file is sqlite then
overwrite with the command line argument.
"""
if args.database_path is None:
if not self.databases:
raise ConfigError("No database config provided")
return
if len(self.databases) == 0:
database_config = {"name": "sqlite3", "args": {}}
self.databases = [DatabaseConnectionConfig("master", database_config)]
self.set_databasepath(args.database_path)
return
if self.get_single_database().name == "sqlite3":
self.set_databasepath(args.database_path)
else:
logger.warning(NON_SQLITE_DATABASE_PATH_WARNING)
def set_databasepath(self, database_path: str) -> None:
if database_path != ":memory:":
database_path = self.abspath(database_path)
self.databases[0].config["args"]["database"] = database_path
@staticmethod
def add_arguments(parser: argparse.ArgumentParser) -> None:
db_group = parser.add_argument_group("database")
db_group.add_argument(
"-d",
"--database-path",
metavar="SQLITE_DATABASE_PATH",
help="The path to a sqlite database to use.",
)
def get_single_database(self) -> DatabaseConnectionConfig:
"""Returns the database if there is only one, useful for e.g. tests"""
if not self.databases:
raise Exception("More than one database exists")
return self.databases[0]
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