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https://mau.dev/maunium/synapse.git
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e584534403
This avoids the overhead of searching through the various configuration classes by directly referencing the class that the attributes are in. It also improves type hints since mypy can now resolve the types of the configuration variables.
357 lines
14 KiB
Python
357 lines
14 KiB
Python
# Copyright 2018 New Vector
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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 logging
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from typing import Dict, List, Optional
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from synapse.metrics.background_process_metrics import wrap_as_background_process
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import DatabasePool, make_in_list_sql_clause
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from synapse.util.caches.descriptors import cached
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logger = logging.getLogger(__name__)
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# Number of msec of granularity to store the monthly_active_user timestamp
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# This means it is not necessary to update the table on every request
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LAST_SEEN_GRANULARITY = 60 * 60 * 1000
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class MonthlyActiveUsersWorkerStore(SQLBaseStore):
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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self._clock = hs.get_clock()
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self.hs = hs
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self._limit_usage_by_mau = hs.config.limit_usage_by_mau
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self._max_mau_value = hs.config.max_mau_value
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@cached(num_args=0)
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async def get_monthly_active_count(self) -> int:
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"""Generates current count of monthly active users
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Returns:
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Number of current monthly active users
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"""
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def _count_users(txn):
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# Exclude app service users
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sql = """
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SELECT COALESCE(count(*), 0)
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FROM monthly_active_users
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LEFT JOIN users
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ON monthly_active_users.user_id=users.name
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WHERE (users.appservice_id IS NULL OR users.appservice_id = '');
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"""
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txn.execute(sql)
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(count,) = txn.fetchone()
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return count
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return await self.db_pool.runInteraction("count_users", _count_users)
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@cached(num_args=0)
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async def get_monthly_active_count_by_service(self) -> Dict[str, int]:
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"""Generates current count of monthly active users broken down by service.
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A service is typically an appservice but also includes native matrix users.
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Since the `monthly_active_users` table is populated from the `user_ips` table
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`config.appservice.track_appservice_user_ips` must be set to `true` for this
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method to return anything other than native matrix users.
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Returns:
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A mapping between app_service_id and the number of occurrences.
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"""
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def _count_users_by_service(txn):
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sql = """
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SELECT COALESCE(appservice_id, 'native'), COALESCE(count(*), 0)
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FROM monthly_active_users
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LEFT JOIN users ON monthly_active_users.user_id=users.name
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GROUP BY appservice_id;
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"""
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txn.execute(sql)
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result = txn.fetchall()
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return dict(result)
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return await self.db_pool.runInteraction(
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"count_users_by_service", _count_users_by_service
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)
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async def get_registered_reserved_users(self) -> List[str]:
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"""Of the reserved threepids defined in config, retrieve those that are associated
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with registered users
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Returns:
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User IDs of actual users that are reserved
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"""
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users = []
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for tp in self.hs.config.mau_limits_reserved_threepids[
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: self.hs.config.max_mau_value
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]:
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user_id = await self.hs.get_datastore().get_user_id_by_threepid(
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tp["medium"], tp["address"]
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)
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if user_id:
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users.append(user_id)
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return users
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@cached(num_args=1)
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async def user_last_seen_monthly_active(self, user_id: str) -> Optional[int]:
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"""
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Checks if a given user is part of the monthly active user group
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Arguments:
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user_id: user to add/update
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Return:
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Timestamp since last seen, None if never seen
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"""
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return await self.db_pool.simple_select_one_onecol(
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table="monthly_active_users",
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keyvalues={"user_id": user_id},
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retcol="timestamp",
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allow_none=True,
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desc="user_last_seen_monthly_active",
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)
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@wrap_as_background_process("reap_monthly_active_users")
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async def reap_monthly_active_users(self):
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"""Cleans out monthly active user table to ensure that no stale
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entries exist.
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"""
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def _reap_users(txn, reserved_users):
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"""
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Args:
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reserved_users (tuple): reserved users to preserve
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"""
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thirty_days_ago = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
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in_clause, in_clause_args = make_in_list_sql_clause(
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self.database_engine, "user_id", reserved_users
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)
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txn.execute(
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"DELETE FROM monthly_active_users WHERE timestamp < ? AND NOT %s"
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% (in_clause,),
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[thirty_days_ago] + in_clause_args,
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)
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if self._limit_usage_by_mau:
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# If MAU user count still exceeds the MAU threshold, then delete on
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# a least recently active basis.
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# Note it is not possible to write this query using OFFSET due to
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# incompatibilities in how sqlite and postgres support the feature.
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# Sqlite requires 'LIMIT -1 OFFSET ?', the LIMIT must be present,
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# while Postgres does not require 'LIMIT', but also does not support
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# negative LIMIT values. So there is no way to write it that both can
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# support
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# Limit must be >= 0 for postgres
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num_of_non_reserved_users_to_remove = max(
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self._max_mau_value - len(reserved_users), 0
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)
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# It is important to filter reserved users twice to guard
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# against the case where the reserved user is present in the
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# SELECT, meaning that a legitimate mau is deleted.
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sql = """
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DELETE FROM monthly_active_users
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WHERE user_id NOT IN (
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SELECT user_id FROM monthly_active_users
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WHERE NOT %s
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ORDER BY timestamp DESC
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LIMIT ?
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)
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AND NOT %s
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""" % (
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in_clause,
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in_clause,
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)
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query_args = (
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in_clause_args
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+ [num_of_non_reserved_users_to_remove]
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+ in_clause_args
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)
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txn.execute(sql, query_args)
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# It seems poor to invalidate the whole cache. Postgres supports
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# 'Returning' which would allow me to invalidate only the
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# specific users, but sqlite has no way to do this and instead
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# I would need to SELECT and the DELETE which without locking
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# is racy.
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# Have resolved to invalidate the whole cache for now and do
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# something about it if and when the perf becomes significant
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self._invalidate_all_cache_and_stream(
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txn, self.user_last_seen_monthly_active
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)
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self._invalidate_cache_and_stream(txn, self.get_monthly_active_count, ())
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reserved_users = await self.get_registered_reserved_users()
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await self.db_pool.runInteraction(
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"reap_monthly_active_users", _reap_users, reserved_users
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)
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class MonthlyActiveUsersStore(MonthlyActiveUsersWorkerStore):
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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self._mau_stats_only = hs.config.mau_stats_only
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# Do not add more reserved users than the total allowable number
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self.db_pool.new_transaction(
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db_conn,
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"initialise_mau_threepids",
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[],
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[],
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self._initialise_reserved_users,
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hs.config.mau_limits_reserved_threepids[: self._max_mau_value],
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)
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def _initialise_reserved_users(self, txn, threepids):
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"""Ensures that reserved threepids are accounted for in the MAU table, should
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be called on start up.
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Args:
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txn (cursor):
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threepids (list[dict]): List of threepid dicts to reserve
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"""
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# XXX what is this function trying to achieve? It upserts into
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# monthly_active_users for each *registered* reserved mau user, but why?
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#
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# - shouldn't there already be an entry for each reserved user (at least
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# if they have been active recently)?
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#
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# - if it's important that the timestamp is kept up to date, why do we only
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# run this at startup?
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for tp in threepids:
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user_id = self.get_user_id_by_threepid_txn(txn, tp["medium"], tp["address"])
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if user_id:
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is_support = self.is_support_user_txn(txn, user_id)
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if not is_support:
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# We do this manually here to avoid hitting #6791
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self.db_pool.simple_upsert_txn(
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txn,
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table="monthly_active_users",
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keyvalues={"user_id": user_id},
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values={"timestamp": int(self._clock.time_msec())},
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)
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else:
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logger.warning("mau limit reserved threepid %s not found in db" % tp)
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async def upsert_monthly_active_user(self, user_id: str) -> None:
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"""Updates or inserts the user into the monthly active user table, which
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is used to track the current MAU usage of the server
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Args:
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user_id: user to add/update
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"""
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# Support user never to be included in MAU stats. Note I can't easily call this
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# from upsert_monthly_active_user_txn because then I need a _txn form of
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# is_support_user which is complicated because I want to cache the result.
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# Therefore I call it here and ignore the case where
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# upsert_monthly_active_user_txn is called directly from
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# _initialise_reserved_users reasoning that it would be very strange to
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# include a support user in this context.
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is_support = await self.is_support_user(user_id)
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if is_support:
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return
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await self.db_pool.runInteraction(
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"upsert_monthly_active_user", self.upsert_monthly_active_user_txn, user_id
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)
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def upsert_monthly_active_user_txn(self, txn, user_id):
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"""Updates or inserts monthly active user member
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We consciously do not call is_support_txn from this method because it
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is not possible to cache the response. is_support_txn will be false in
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almost all cases, so it seems reasonable to call it only for
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upsert_monthly_active_user and to call is_support_txn manually
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for cases where upsert_monthly_active_user_txn is called directly,
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like _initialise_reserved_users
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In short, don't call this method with support users. (Support users
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should not appear in the MAU stats).
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Args:
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txn (cursor):
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user_id (str): user to add/update
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"""
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# Am consciously deciding to lock the table on the basis that is ought
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# never be a big table and alternative approaches (batching multiple
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# upserts into a single txn) introduced a lot of extra complexity.
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# See https://github.com/matrix-org/synapse/issues/3854 for more
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self.db_pool.simple_upsert_txn(
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txn,
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table="monthly_active_users",
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keyvalues={"user_id": user_id},
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values={"timestamp": int(self._clock.time_msec())},
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)
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self._invalidate_cache_and_stream(txn, self.get_monthly_active_count, ())
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self._invalidate_cache_and_stream(
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txn, self.get_monthly_active_count_by_service, ()
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)
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self._invalidate_cache_and_stream(
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txn, self.user_last_seen_monthly_active, (user_id,)
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)
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async def populate_monthly_active_users(self, user_id):
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"""Checks on the state of monthly active user limits and optionally
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add the user to the monthly active tables
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Args:
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user_id(str): the user_id to query
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"""
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if self._limit_usage_by_mau or self._mau_stats_only:
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# Trial users and guests should not be included as part of MAU group
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is_guest = await self.is_guest(user_id)
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if is_guest:
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return
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is_trial = await self.is_trial_user(user_id)
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if is_trial:
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return
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last_seen_timestamp = await self.user_last_seen_monthly_active(user_id)
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now = self.hs.get_clock().time_msec()
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# We want to reduce to the total number of db writes, and are happy
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# to trade accuracy of timestamp in order to lighten load. This means
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# We always insert new users (where MAU threshold has not been reached),
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# but only update if we have not previously seen the user for
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# LAST_SEEN_GRANULARITY ms
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if last_seen_timestamp is None:
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# In the case where mau_stats_only is True and limit_usage_by_mau is
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# False, there is no point in checking get_monthly_active_count - it
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# adds no value and will break the logic if max_mau_value is exceeded.
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if not self._limit_usage_by_mau:
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await self.upsert_monthly_active_user(user_id)
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else:
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count = await self.get_monthly_active_count()
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if count < self._max_mau_value:
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await self.upsert_monthly_active_user(user_id)
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elif now - last_seen_timestamp > LAST_SEEN_GRANULARITY:
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await self.upsert_monthly_active_user(user_id)
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