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https://mau.dev/maunium/synapse.git
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04cc249b43
This is *not* ready for production yet. Caveats: 1. We should write some tests... 2. The stream token that we use for events can get stalled at the minimum position of all writers. This means that new events may not be processed and e.g. sent down sync streams if a writer isn't writing or is slow.
120 lines
4.4 KiB
Python
120 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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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 synapse.storage.database import DatabasePool, make_conn
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from synapse.storage.databases.main.events import PersistEventsStore
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from synapse.storage.databases.state import StateGroupDataStore
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from synapse.storage.engines import create_engine
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from synapse.storage.prepare_database import prepare_database
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logger = logging.getLogger(__name__)
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class Databases:
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"""The various databases.
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These are low level interfaces to physical databases.
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Attributes:
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main (DataStore)
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"""
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def __init__(self, main_store_class, hs):
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# Note we pass in the main store class here as workers use a different main
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# store.
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self.databases = []
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main = None
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state = None
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persist_events = None
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for database_config in hs.config.database.databases:
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db_name = database_config.name
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engine = create_engine(database_config.config)
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with make_conn(database_config, engine) as db_conn:
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logger.info("[database config %r]: Checking database server", db_name)
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engine.check_database(db_conn)
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logger.info(
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"[database config %r]: Preparing for databases %r",
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db_name,
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database_config.databases,
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)
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prepare_database(
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db_conn, engine, hs.config, databases=database_config.databases,
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)
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database = DatabasePool(hs, database_config, engine)
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if "main" in database_config.databases:
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logger.info(
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"[database config %r]: Starting 'main' database", db_name
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)
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# Sanity check we don't try and configure the main store on
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# multiple databases.
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if main:
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raise Exception("'main' data store already configured")
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main = main_store_class(database, db_conn, hs)
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# If we're on a process that can persist events also
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# instantiate a `PersistEventsStore`
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if hs.get_instance_name() in hs.config.worker.writers.events:
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persist_events = PersistEventsStore(hs, database, main)
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if "state" in database_config.databases:
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logger.info(
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"[database config %r]: Starting 'state' database", db_name
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)
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# Sanity check we don't try and configure the state store on
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# multiple databases.
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if state:
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raise Exception("'state' data store already configured")
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state = StateGroupDataStore(database, db_conn, hs)
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db_conn.commit()
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self.databases.append(database)
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logger.info("[database config %r]: prepared", db_name)
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# Closing the context manager doesn't close the connection.
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# psycopg will close the connection when the object gets GCed, but *only*
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# if the PID is the same as when the connection was opened [1], and
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# it may not be if we fork in the meantime.
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#
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# [1]: https://github.com/psycopg/psycopg2/blob/2_8_5/psycopg/connection_type.c#L1378
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db_conn.close()
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# Sanity check that we have actually configured all the required stores.
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if not main:
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raise Exception("No 'main' database configured")
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if not state:
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raise Exception("No 'state' database configured")
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# We use local variables here to ensure that the databases do not have
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# optional types.
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self.main = main
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self.state = state
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self.persist_events = persist_events
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