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![Neil Johnson](/assets/img/avatar_default.png)
Allow for the creation of a support user. A support user can access the server, join rooms, interact with other users, but does not appear in the user directory nor does it contribute to monthly active user limits.
312 lines
12 KiB
Python
312 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# 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 twisted.internet import defer
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from synapse.util.caches.descriptors import cached
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from ._base import SQLBaseStore
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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 MonthlyActiveUsersStore(SQLBaseStore):
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def __init__(self, dbconn, hs):
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super(MonthlyActiveUsersStore, self).__init__(None, hs)
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self._clock = hs.get_clock()
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self.hs = hs
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self.reserved_users = ()
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# Do not add more reserved users than the total allowable number
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self._new_transaction(
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dbconn, "initialise_mau_threepids", [], [],
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self._initialise_reserved_users,
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hs.config.mau_limits_reserved_threepids[:self.hs.config.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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reserved_user_list = []
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for tp in threepids:
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user_id = self.get_user_id_by_threepid_txn(
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txn,
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tp["medium"], tp["address"]
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)
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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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self.upsert_monthly_active_user_txn(txn, user_id)
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reserved_user_list.append(user_id)
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else:
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logger.warning(
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"mau limit reserved threepid %s not found in db" % tp
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)
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self.reserved_users = tuple(reserved_user_list)
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@defer.inlineCallbacks
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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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Returns:
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Deferred[]
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"""
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def _reap_users(txn):
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# Purge stale users
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thirty_days_ago = (
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int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
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)
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query_args = [thirty_days_ago]
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base_sql = "DELETE FROM monthly_active_users WHERE timestamp < ?"
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# Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
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# when len(reserved_users) == 0. Works fine on sqlite.
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if len(self.reserved_users) > 0:
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# questionmarks is a hack to overcome sqlite not supporting
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# tuples in 'WHERE IN %s'
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questionmarks = '?' * len(self.reserved_users)
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query_args.extend(self.reserved_users)
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sql = base_sql + """ AND user_id NOT IN ({})""".format(
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','.join(questionmarks)
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)
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else:
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sql = base_sql
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txn.execute(sql, query_args)
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if self.hs.config.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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safe_guard = self.hs.config.max_mau_value - len(self.reserved_users)
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# Must be greater than zero for postgres
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safe_guard = safe_guard if safe_guard > 0 else 0
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query_args = [safe_guard]
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base_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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ORDER BY timestamp DESC
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LIMIT ?
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)
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"""
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# Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
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# when len(reserved_users) == 0. Works fine on sqlite.
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if len(self.reserved_users) > 0:
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query_args.extend(self.reserved_users)
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sql = base_sql + """ AND user_id NOT IN ({})""".format(
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','.join(questionmarks)
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)
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else:
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sql = base_sql
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txn.execute(sql, query_args)
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yield self.runInteraction("reap_monthly_active_users", _reap_users)
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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.user_last_seen_monthly_active.invalidate_all()
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self.get_monthly_active_count.invalidate_all()
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@cached(num_args=0)
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def get_monthly_active_count(self):
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"""Generates current count of monthly active users
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Returns:
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Defered[int]: Number of current monthly active users
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"""
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def _count_users(txn):
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sql = "SELECT COALESCE(count(*), 0) FROM monthly_active_users"
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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 self.runInteraction("count_users", _count_users)
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@defer.inlineCallbacks
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def get_registered_reserved_users_count(self):
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"""Of the reserved threepids defined in config, how many are associated
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with registered users?
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Returns:
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Defered[int]: Number of real reserved users
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"""
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count = 0
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for tp in self.hs.config.mau_limits_reserved_threepids:
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user_id = yield 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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count = count + 1
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defer.returnValue(count)
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@defer.inlineCallbacks
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def upsert_monthly_active_user(self, user_id):
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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 (str): 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 = yield self.is_support_user(user_id)
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if is_support:
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return
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is_insert = yield self.runInteraction(
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"upsert_monthly_active_user", self.upsert_monthly_active_user_txn,
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user_id
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)
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if is_insert:
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self.user_last_seen_monthly_active.invalidate((user_id,))
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self.get_monthly_active_count.invalidate(())
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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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Note that, after calling this method, it will generally be necessary
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to invalidate the caches on user_last_seen_monthly_active and
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get_monthly_active_count. We can't do that here, because we are running
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in a database thread rather than the main thread, and we can't call
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txn.call_after because txn may not be a LoggingTransaction.
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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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Returns:
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bool: True if a new entry was created, False if an
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existing one was updated.
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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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is_insert = self._simple_upsert_txn(
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txn,
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table="monthly_active_users",
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keyvalues={
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"user_id": user_id,
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},
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values={
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"timestamp": int(self._clock.time_msec()),
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},
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)
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return is_insert
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@cached(num_args=1)
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def user_last_seen_monthly_active(self, user_id):
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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 (str): user to add/update
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Return:
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Deferred[int] : timestamp since last seen, None if never seen
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"""
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return(self._simple_select_one_onecol(
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table="monthly_active_users",
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keyvalues={
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"user_id": user_id,
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},
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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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@defer.inlineCallbacks
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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.hs.config.limit_usage_by_mau or self.hs.config.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 = yield self.is_guest(user_id)
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if is_guest:
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return
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is_trial = yield 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 = yield 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.hs.config.limit_usage_by_mau:
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yield self.upsert_monthly_active_user(user_id)
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else:
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count = yield self.get_monthly_active_count()
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if count < self.hs.config.max_mau_value:
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yield self.upsert_monthly_active_user(user_id)
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elif now - last_seen_timestamp > LAST_SEEN_GRANULARITY:
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yield self.upsert_monthly_active_user(user_id)
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