363 lines
12 KiB
Python
363 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket 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 fnmatch
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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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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 = 32
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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):
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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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"""
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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("Database needs to be upgraded")
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else:
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_upgrade_existing_database(
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cur, user_version, delta_files, upgraded, database_engine, config
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)
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else:
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_setup_new_database(cur, database_engine)
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cur.close()
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db_conn.commit()
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except:
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db_conn.rollback()
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raise
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def _setup_new_database(cur, database_engine):
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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.
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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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"""
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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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valid_dirs = []
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pattern = re.compile(r"^\d+(\.sql)?$")
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for filename in directory_entries:
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match = pattern.match(filename)
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abs_path = os.path.join(current_dir, filename)
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if match and os.path.isdir(abs_path):
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ver = int(match.group(0))
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if ver <= SCHEMA_VERSION:
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valid_dirs.append((ver, abs_path))
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else:
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logger.warn("Unexpected entry in 'full_schemas': %s", filename)
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if not valid_dirs:
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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, sql_dir = max(valid_dirs, key=lambda x: x[0])
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logger.debug("Initialising schema v%d", max_current_ver)
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directory_entries = os.listdir(sql_dir)
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for filename in fnmatch.filter(directory_entries, "*.sql"):
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sql_loc = os.path.join(sql_dir, filename)
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logger.debug("Applying schema %s", sql_loc)
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executescript(cur, sql_loc)
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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)"
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" 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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is_empty=True,
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)
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def _upgrade_existing_database(cur, current_version, applied_delta_files,
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upgraded, database_engine, config, is_empty=False):
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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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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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"""
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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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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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delta_dir = os.path.join(dir_path, "schema", "delta", str(v))
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try:
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directory_entries = os.listdir(delta_dir)
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except OSError:
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logger.exception("Could not open delta dir for version %d", v)
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raise UpgradeDatabaseException(
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"Could not open delta dir for version %d" % (v,)
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)
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directory_entries.sort()
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for file_name in directory_entries:
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relative_path = os.path.join(str(v), file_name)
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logger.debug("Found file: %s", relative_path)
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if relative_path in applied_delta_files:
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continue
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absolute_path = os.path.join(
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dir_path, "schema", "delta", relative_path,
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)
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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" % (
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v, root_name
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)
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with open(absolute_path) as python_file:
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module = imp.load_source(
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module_name, absolute_path, python_file
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)
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logger.debug("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":
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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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pass
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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.debug("Applying schema %s", relative_path)
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executescript(cur, absolute_path)
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else:
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# Not a valid delta file.
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logger.warn(
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"Found directory entry that did not end in .py or"
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" .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)"
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" 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)"
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" VALUES (?,?)",
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),
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(v, True)
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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" % (
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statement_buffer.strip(),
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statements[0].strip()
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)
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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(
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dir_path, "schema", "schema_version.sql",
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)
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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.fetchall()]
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return current_version, applied_deltas, upgraded
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return None
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