279 lines
10 KiB
Python
279 lines
10 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._initialise_reserved_users(
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dbconn.cursor(),
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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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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 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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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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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:
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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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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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