mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
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![Andrew Morgan](/assets/img/avatar_default.png)
Sends password reset emails from the homeserver instead of proxying to the identity server. This is now the default behaviour for security reasons. If you wish to continue proxying password reset requests to the identity server you must now enable the email.trust_identity_server_for_password_resets option. This PR is a culmination of 3 smaller PRs which have each been separately reviewed: * #5308 * #5345 * #5368
424 lines
14 KiB
Python
424 lines
14 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 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 = 55
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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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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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"""
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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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# 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):
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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)" " 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(
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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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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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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(dir_path, "schema", "delta", relative_path)
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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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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.info("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" " .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]
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return current_version, applied_deltas, upgraded
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return None
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