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# -*- coding: utf-8 -*-
# Copyright 2014-2016 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.
import logging
import os
from textwrap import indent
import yaml
from synapse.config._base import Config, ConfigError
logger = logging.getLogger(__name__)
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):
if db_config["name"] not in ("sqlite3", "psycopg2"):
raise ConfigError("Unsupported database type %r" % (db_config["name"],))
if db_config["name"] == "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
self.data_stores = data_stores
class DatabaseConfig(Config):
section = "database"
def read_config(self, config, **kwargs):
self.event_cache_size = self.parse_size(config.get("event_cache_size", "10K"))
# 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")
if multi_database_config and database_config:
raise ConfigError("Can't specify both 'database' and 'datbases' in config")
if multi_database_config:
if config.get("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()
]
else:
if database_config is None:
database_config = {"name": "sqlite3", "args": {}}
self.databases = [DatabaseConnectionConfig("master", database_config)]
self.set_databasepath(config.get("database_path"))
def generate_config_section(self, data_dir_path, database_conf, **kwargs):
if not database_conf:
database_path = os.path.join(data_dir_path, "homeserver.db")
database_conf = (
"""# The database engine name
name: "sqlite3"
# Arguments to pass to the engine
args:
# Path to the database
database: "%(database_path)s"
"""
% locals()
)
else:
database_conf = indent(yaml.dump(database_conf), " " * 10).lstrip()
return (
"""\
## Database ##
database:
%(database_conf)s
# Number of events to cache in memory.
#
#event_cache_size: 10K
"""
% locals()
)
def read_arguments(self, args):
self.set_databasepath(args.database_path)
def set_databasepath(self, database_path):
if database_path is None:
return
if database_path != ":memory:":
database_path = self.abspath(database_path)
# We only support setting a database path if we have a single sqlite3
# database.
if len(self.databases) != 1:
raise ConfigError("Cannot specify 'database_path' with multiple databases")
database = self.get_single_database()
if database.config["name"] != "sqlite3":
# We don't raise here as we haven't done so before for this case.
logger.warn("Ignoring 'database_path' for non-sqlite3 database")
return
database.config["args"]["database"] = database_path
@staticmethod
def add_arguments(parser):
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 len(self.databases) != 1:
raise Exception("More than one database exists")
return self.databases[0]
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