583 lines
20 KiB
Python
583 lines
20 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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from typing import TextIO
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import attr
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from synapse.storage.engines.postgres import PostgresEngine
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from synapse.storage.types import Cursor
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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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# XXX: If you're about to bump this to 59 (or higher) please create an update
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# that drops the unused `cache_invalidation_stream` table, as per #7436!
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SCHEMA_VERSION = 58
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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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# We're about to set up a brand new database so we check that its
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# configured to our liking.
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database_engine.check_new_database(cur)
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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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None if we are initialising a blank database, otherwise the application
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config
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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 is_empty:
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assert not applied_delta_files
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else:
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assert config
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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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# some of the deltas assume that config.server_name is set correctly, so now
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# is a good time to run the sanity check.
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if not is_empty and "main" in data_stores:
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from synapse.storage.data_stores.main import check_database_before_upgrade
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check_database_before_upgrade(cur, database_engine, config)
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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 = {
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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, 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 = {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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execute_statements_from_stream(cur, stream)
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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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|
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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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|
|
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def executescript(txn, schema_path):
|
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with open(schema_path, "r") as f:
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execute_statements_from_stream(txn, f)
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|
|
|
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def execute_statements_from_stream(cur: Cursor, f: TextIO):
|
|
for statement in get_statements(f):
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cur.execute(statement)
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|
|
|
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def _get_or_create_schema_state(txn, database_engine):
|
|
# Bluntly try creating the schema_version tables.
|
|
schema_path = os.path.join(dir_path, "schema", "schema_version.sql")
|
|
executescript(txn, schema_path)
|
|
|
|
txn.execute("SELECT version, upgraded FROM schema_version")
|
|
row = txn.fetchone()
|
|
current_version = int(row[0]) if row else None
|
|
upgraded = bool(row[1]) if row else None
|
|
|
|
if current_version:
|
|
txn.execute(
|
|
database_engine.convert_param_style(
|
|
"SELECT file FROM applied_schema_deltas WHERE version >= ?"
|
|
),
|
|
(current_version,),
|
|
)
|
|
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()
|