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# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This schema delta will be run after 'stats_separated1.sql' due to lexicographic
# ordering. Note that it MUST be so.
from synapse.storage.engines import Sqlite3Engine, PostgresEngine
def _run_create_generic(stats_type, cursor, database_engine):
"""
Creates the pertinent (partial, if supported) indices for one kind of stats.
Args:
stats_type: "room" or "user" – the type of stats
cursor: Database Cursor
database_engine: Database Engine
"""
if isinstance(database_engine, Sqlite3Engine):
# even though SQLite >= 3.8 can support partial indices, we won't enable
# them, in case the SQLite database may be later used on another system.
# It's also the case that SQLite is only likely to be used in small
# deployments or testing, where the optimisations gained by use of a
# partial index are not a big concern.
cursor.execute(
"""
CREATE INDEX IF NOT EXISTS %s_stats_current_dirty
ON %s_stats_current (end_ts);
"""
% (stats_type, stats_type)
)
cursor.execute(
"""
CREATE INDEX IF NOT EXISTS %s_stats_not_complete
ON %s_stats_current (completed_delta_stream_id, %s_id);
"""
% (stats_type, stats_type, stats_type)
)
elif isinstance(database_engine, PostgresEngine):
# This partial index helps us with finding dirty stats rows
cursor.execute(
"""
CREATE INDEX IF NOT EXISTS %s_stats_current_dirty
ON %s_stats_current (end_ts)
WHERE end_ts IS NOT NULL;
"""
% (stats_type, stats_type)
)
# This partial index helps us with old collection
cursor.execute(
"""
CREATE INDEX IF NOT EXISTS %s_stats_not_complete
ON %s_stats_current (%s_id)
WHERE completed_delta_stream_id IS NULL;
"""
% (stats_type, stats_type, stats_type)
)
else:
raise NotImplementedError("Unknown database engine.")
def run_create(cursor, database_engine):
"""
This function is called as part of the schema delta.
It will create indices – partial, if supported – for the new 'separated'
room & user statistics.
"""
_run_create_generic("room", cursor, database_engine)
_run_create_generic("user", cursor, database_engine)
def run_upgrade(cur, database_engine, config):
"""
This function is run on a database upgrade (of a non-empty database).
We have no need to do anything specific here.
"""
pass
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