mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-25 19:56:21 +00:00
![Erik Johnston](/assets/img/avatar_default.png)
Currently we rely on `current_state_events` to figure out what rooms a user was in and their last membership event in there. However, if the server leaves the room then the table may be cleaned up and that information is lost. So lets add a table that separately holds that information.
561 lines
19 KiB
Python
561 lines
19 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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# Copyright 2018 New Vector 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 imp
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import logging
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import os
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import re
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from collections import Counter
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import attr
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from synapse.storage.engines.postgres import PostgresEngine
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logger = logging.getLogger(__name__)
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# Remember to update this number every time a change is made to database
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# schema files, so the users will be informed on server restarts.
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SCHEMA_VERSION = 57
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dir_path = os.path.abspath(os.path.dirname(__file__))
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class PrepareDatabaseException(Exception):
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pass
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class UpgradeDatabaseException(PrepareDatabaseException):
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pass
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def prepare_database(db_conn, database_engine, config, data_stores=["main", "state"]):
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"""Prepares a database for usage. Will either create all necessary tables
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or upgrade from an older schema version.
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If `config` is None then prepare_database will assert that no upgrade is
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necessary, *or* will create a fresh database if the database is empty.
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Args:
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db_conn:
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database_engine:
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config (synapse.config.homeserver.HomeServerConfig|None):
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application config, or None if we are connecting to an existing
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database which we expect to be configured already
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data_stores (list[str]): The name of the data stores that will be used
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with this database. Defaults to all data stores.
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"""
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try:
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cur = db_conn.cursor()
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version_info = _get_or_create_schema_state(cur, database_engine)
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if version_info:
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user_version, delta_files, upgraded = version_info
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if config is None:
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if user_version != SCHEMA_VERSION:
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# If we don't pass in a config file then we are expecting to
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# have already upgraded the DB.
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raise UpgradeDatabaseException(
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"Expected database schema version %i but got %i"
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% (SCHEMA_VERSION, user_version)
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)
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else:
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_upgrade_existing_database(
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cur,
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user_version,
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delta_files,
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upgraded,
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database_engine,
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config,
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data_stores=data_stores,
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)
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else:
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_setup_new_database(cur, database_engine, data_stores=data_stores)
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# check if any of our configured dynamic modules want a database
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if config is not None:
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_apply_module_schemas(cur, database_engine, config)
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cur.close()
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db_conn.commit()
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except Exception:
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db_conn.rollback()
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raise
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def _setup_new_database(cur, database_engine, data_stores):
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"""Sets up the database by finding a base set of "full schemas" and then
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applying any necessary deltas, including schemas from the given data
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stores.
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The "full_schemas" directory has subdirectories named after versions. This
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function searches for the highest version less than or equal to
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`SCHEMA_VERSION` and executes all .sql files in that directory.
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The function will then apply all deltas for all versions after the base
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version.
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Example directory structure:
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schema/
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delta/
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...
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full_schemas/
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3/
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test.sql
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...
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11/
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foo.sql
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bar.sql
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...
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In the example foo.sql and bar.sql would be run, and then any delta files
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for versions strictly greater than 11.
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Note: we apply the full schemas and deltas from the top level `schema/`
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folder as well those in the data stores specified.
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Args:
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cur (Cursor): a database cursor
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database_engine (DatabaseEngine)
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data_stores (list[str]): The names of the data stores to instantiate
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on the given database.
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"""
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current_dir = os.path.join(dir_path, "schema", "full_schemas")
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directory_entries = os.listdir(current_dir)
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# First we find the highest full schema version we have
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valid_versions = []
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for filename in directory_entries:
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try:
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ver = int(filename)
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except ValueError:
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continue
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if ver <= SCHEMA_VERSION:
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valid_versions.append(ver)
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if not valid_versions:
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raise PrepareDatabaseException(
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"Could not find a suitable base set of full schemas"
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)
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max_current_ver = max(valid_versions)
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logger.debug("Initialising schema v%d", max_current_ver)
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# Now lets find all the full schema files, both in the global schema and
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# in data store schemas.
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directories = [os.path.join(current_dir, str(max_current_ver))]
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directories.extend(
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os.path.join(
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dir_path,
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"data_stores",
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data_store,
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"schema",
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"full_schemas",
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str(max_current_ver),
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)
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for data_store in data_stores
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)
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directory_entries = []
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for directory in directories:
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directory_entries.extend(
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_DirectoryListing(file_name, os.path.join(directory, file_name))
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for file_name in os.listdir(directory)
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)
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if isinstance(database_engine, PostgresEngine):
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specific = "postgres"
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else:
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specific = "sqlite"
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directory_entries.sort()
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for entry in directory_entries:
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if entry.file_name.endswith(".sql") or entry.file_name.endswith(
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".sql." + specific
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):
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logger.debug("Applying schema %s", entry.absolute_path)
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executescript(cur, entry.absolute_path)
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cur.execute(
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database_engine.convert_param_style(
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"INSERT INTO schema_version (version, upgraded) VALUES (?,?)"
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),
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(max_current_ver, False),
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)
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_upgrade_existing_database(
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cur,
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current_version=max_current_ver,
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applied_delta_files=[],
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upgraded=False,
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database_engine=database_engine,
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config=None,
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data_stores=data_stores,
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is_empty=True,
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)
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def _upgrade_existing_database(
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cur,
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current_version,
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applied_delta_files,
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upgraded,
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database_engine,
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config,
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data_stores,
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is_empty=False,
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):
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"""Upgrades an existing database.
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Delta files can either be SQL stored in *.sql files, or python modules
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in *.py.
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There can be multiple delta files per version. Synapse will keep track of
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which delta files have been applied, and will apply any that haven't been
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even if there has been no version bump. This is useful for development
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where orthogonal schema changes may happen on separate branches.
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Different delta files for the same version *must* be orthogonal and give
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the same result when applied in any order. No guarantees are made on the
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order of execution of these scripts.
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This is a no-op of current_version == SCHEMA_VERSION.
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Example directory structure:
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schema/
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delta/
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11/
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foo.sql
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...
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12/
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foo.sql
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bar.py
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...
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full_schemas/
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...
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In the example, if current_version is 11, then foo.sql will be run if and
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only if `upgraded` is True. Then `foo.sql` and `bar.py` would be run in
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some arbitrary order.
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Note: we apply the delta files from the specified data stores as well as
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those in the top-level schema. We apply all delta files across data stores
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for a version before applying those in the next version.
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Args:
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cur (Cursor)
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current_version (int): The current version of the schema.
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applied_delta_files (list): A list of deltas that have already been
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applied.
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upgraded (bool): Whether the current version was generated by having
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applied deltas or from full schema file. If `True` the function
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will never apply delta files for the given `current_version`, since
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the current_version wasn't generated by applying those delta files.
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database_engine (DatabaseEngine)
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config (synapse.config.homeserver.HomeServerConfig|None):
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application config, or None if we are connecting to an existing
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database which we expect to be configured already
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data_stores (list[str]): The names of the data stores to instantiate
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on the given database.
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is_empty (bool): Is this a blank database? I.e. do we need to run the
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upgrade portions of the delta scripts.
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"""
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if current_version > SCHEMA_VERSION:
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raise ValueError(
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"Cannot use this database as it is too "
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+ "new for the server to understand"
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)
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start_ver = current_version
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if not upgraded:
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start_ver += 1
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logger.debug("applied_delta_files: %s", applied_delta_files)
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if isinstance(database_engine, PostgresEngine):
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specific_engine_extension = ".postgres"
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else:
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specific_engine_extension = ".sqlite"
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specific_engine_extensions = (".sqlite", ".postgres")
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for v in range(start_ver, SCHEMA_VERSION + 1):
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logger.info("Upgrading schema to v%d", v)
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# We need to search both the global and per data store schema
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# directories for schema updates.
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# First we find the directories to search in
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delta_dir = os.path.join(dir_path, "schema", "delta", str(v))
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directories = [delta_dir]
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for data_store in data_stores:
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directories.append(
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os.path.join(
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dir_path, "data_stores", data_store, "schema", "delta", str(v)
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)
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)
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# Used to check if we have any duplicate file names
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file_name_counter = Counter()
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# Now find which directories have anything of interest.
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directory_entries = []
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for directory in directories:
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logger.debug("Looking for schema deltas in %s", directory)
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try:
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file_names = os.listdir(directory)
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directory_entries.extend(
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_DirectoryListing(file_name, os.path.join(directory, file_name))
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for file_name in file_names
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)
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for file_name in file_names:
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file_name_counter[file_name] += 1
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except FileNotFoundError:
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# Data stores can have empty entries for a given version delta.
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pass
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except OSError:
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raise UpgradeDatabaseException(
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"Could not open delta dir for version %d: %s" % (v, directory)
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)
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duplicates = set(
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file_name for file_name, count in file_name_counter.items() if count > 1
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)
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if duplicates:
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# We don't support using the same file name in the same delta version.
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raise PrepareDatabaseException(
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"Found multiple delta files with the same name in v%d: %s",
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v,
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duplicates,
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)
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# We sort to ensure that we apply the delta files in a consistent
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# order (to avoid bugs caused by inconsistent directory listing order)
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directory_entries.sort()
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for entry in directory_entries:
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file_name = entry.file_name
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relative_path = os.path.join(str(v), file_name)
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absolute_path = entry.absolute_path
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logger.debug("Found file: %s (%s)", relative_path, absolute_path)
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if relative_path in applied_delta_files:
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continue
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root_name, ext = os.path.splitext(file_name)
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if ext == ".py":
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# This is a python upgrade module. We need to import into some
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# package and then execute its `run_upgrade` function.
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module_name = "synapse.storage.v%d_%s" % (v, root_name)
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with open(absolute_path) as python_file:
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module = imp.load_source(module_name, absolute_path, python_file)
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logger.info("Running script %s", relative_path)
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module.run_create(cur, database_engine)
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if not is_empty:
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module.run_upgrade(cur, database_engine, config=config)
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elif ext == ".pyc" or file_name == "__pycache__":
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# Sometimes .pyc files turn up anyway even though we've
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# disabled their generation; e.g. from distribution package
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# installers. Silently skip it
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continue
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elif ext == ".sql":
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# A plain old .sql file, just read and execute it
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logger.info("Applying schema %s", relative_path)
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executescript(cur, absolute_path)
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elif ext == specific_engine_extension and root_name.endswith(".sql"):
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# A .sql file specific to our engine; just read and execute it
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logger.info("Applying engine-specific schema %s", relative_path)
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executescript(cur, absolute_path)
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elif ext in specific_engine_extensions and root_name.endswith(".sql"):
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# A .sql file for a different engine; skip it.
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continue
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else:
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# Not a valid delta file.
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logger.warning(
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"Found directory entry that did not end in .py or .sql: %s",
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relative_path,
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)
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continue
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# Mark as done.
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cur.execute(
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database_engine.convert_param_style(
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"INSERT INTO applied_schema_deltas (version, file) VALUES (?,?)"
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),
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(v, relative_path),
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)
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cur.execute("DELETE FROM schema_version")
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cur.execute(
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database_engine.convert_param_style(
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"INSERT INTO schema_version (version, upgraded) VALUES (?,?)"
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),
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(v, True),
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)
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def _apply_module_schemas(txn, database_engine, config):
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"""Apply the module schemas for the dynamic modules, if any
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Args:
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cur: database cursor
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database_engine: synapse database engine class
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config (synapse.config.homeserver.HomeServerConfig):
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application config
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"""
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for (mod, _config) in config.password_providers:
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if not hasattr(mod, "get_db_schema_files"):
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continue
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modname = ".".join((mod.__module__, mod.__name__))
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_apply_module_schema_files(
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txn, database_engine, modname, mod.get_db_schema_files()
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)
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def _apply_module_schema_files(cur, database_engine, modname, names_and_streams):
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"""Apply the module schemas for a single module
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Args:
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cur: database cursor
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database_engine: synapse database engine class
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modname (str): fully qualified name of the module
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names_and_streams (Iterable[(str, file)]): the names and streams of
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schemas to be applied
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"""
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cur.execute(
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database_engine.convert_param_style(
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"SELECT file FROM applied_module_schemas WHERE module_name = ?"
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),
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(modname,),
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)
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applied_deltas = set(d for d, in cur)
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for (name, stream) in names_and_streams:
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if name in applied_deltas:
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continue
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root_name, ext = os.path.splitext(name)
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if ext != ".sql":
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raise PrepareDatabaseException(
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"only .sql files are currently supported for module schemas"
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)
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logger.info("applying schema %s for %s", name, modname)
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for statement in get_statements(stream):
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cur.execute(statement)
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# Mark as done.
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cur.execute(
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database_engine.convert_param_style(
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"INSERT INTO applied_module_schemas (module_name, file) VALUES (?,?)"
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),
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(modname, name),
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)
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def get_statements(f):
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statement_buffer = ""
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in_comment = False # If we're in a /* ... */ style comment
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for line in f:
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line = line.strip()
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if in_comment:
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# Check if this line contains an end to the comment
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comments = line.split("*/", 1)
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if len(comments) == 1:
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continue
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line = comments[1]
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in_comment = False
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# Remove inline block comments
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line = re.sub(r"/\*.*\*/", " ", line)
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# Does this line start a comment?
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comments = line.split("/*", 1)
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if len(comments) > 1:
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line = comments[0]
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in_comment = True
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# Deal with line comments
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line = line.split("--", 1)[0]
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line = line.split("//", 1)[0]
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# Find *all* semicolons. We need to treat first and last entry
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# specially.
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statements = line.split(";")
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# We must prepend statement_buffer to the first statement
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first_statement = "%s %s" % (statement_buffer.strip(), statements[0].strip())
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statements[0] = first_statement
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# Every entry, except the last, is a full statement
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for statement in statements[:-1]:
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yield statement.strip()
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# The last entry did *not* end in a semicolon, so we store it for the
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# next semicolon we find
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statement_buffer = statements[-1].strip()
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def executescript(txn, schema_path):
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with open(schema_path, "r") as f:
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for statement in get_statements(f):
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txn.execute(statement)
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def _get_or_create_schema_state(txn, database_engine):
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# Bluntly try creating the schema_version tables.
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schema_path = os.path.join(dir_path, "schema", "schema_version.sql")
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executescript(txn, schema_path)
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txn.execute("SELECT version, upgraded FROM schema_version")
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row = txn.fetchone()
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current_version = int(row[0]) if row else None
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upgraded = bool(row[1]) if row else None
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if current_version:
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txn.execute(
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database_engine.convert_param_style(
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"SELECT file FROM applied_schema_deltas WHERE version >= ?"
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),
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(current_version,),
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)
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applied_deltas = [d for d, in txn]
|
|
return current_version, applied_deltas, upgraded
|
|
|
|
return None
|
|
|
|
|
|
@attr.s()
|
|
class _DirectoryListing(object):
|
|
"""Helper class to store schema file name and the
|
|
absolute path to it.
|
|
|
|
These entries get sorted, so for consistency we want to ensure that
|
|
`file_name` attr is kept first.
|
|
"""
|
|
|
|
file_name = attr.ib()
|
|
absolute_path = attr.ib()
|