1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector
#
# 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.
import logging
from twisted.internet import defer
from synapse.util.caches.descriptors import cached
from ._base import SQLBaseStore
logger = logging.getLogger(__name__)
# Number of msec of granularity to store the monthly_active_user timestamp
# This means it is not necessary to update the table on every request
LAST_SEEN_GRANULARITY = 60 * 60 * 1000
class MonthlyActiveUsersStore(SQLBaseStore):
def __init__(self, dbconn, hs):
super(MonthlyActiveUsersStore, self).__init__(None, hs)
self._clock = hs.get_clock()
self.hs = hs
self.reserved_users = ()
@defer.inlineCallbacks
def initialise_reserved_users(self, threepids):
store = self.hs.get_datastore()
reserved_user_list = []
# Do not add more reserved users than the total allowable number
for tp in threepids[:self.hs.config.max_mau_value]:
user_id = yield store.get_user_id_by_threepid(
tp["medium"], tp["address"]
)
if user_id:
yield self.upsert_monthly_active_user(user_id)
reserved_user_list.append(user_id)
else:
logger.warning(
"mau limit reserved threepid %s not found in db" % tp
)
self.reserved_users = tuple(reserved_user_list)
@defer.inlineCallbacks
def reap_monthly_active_users(self):
"""
Cleans out monthly active user table to ensure that no stale
entries exist.
Returns:
Deferred[]
"""
def _reap_users(txn):
# Purge stale users
thirty_days_ago = (
int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
)
query_args = [thirty_days_ago]
base_sql = "DELETE FROM monthly_active_users WHERE timestamp < ?"
# Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
# when len(reserved_users) == 0. Works fine on sqlite.
if len(self.reserved_users) > 0:
# questionmarks is a hack to overcome sqlite not supporting
# tuples in 'WHERE IN %s'
questionmarks = '?' * len(self.reserved_users)
query_args.extend(self.reserved_users)
sql = base_sql + """ AND user_id NOT IN ({})""".format(
','.join(questionmarks)
)
else:
sql = base_sql
txn.execute(sql, query_args)
# If MAU user count still exceeds the MAU threshold, then delete on
# a least recently active basis.
# Note it is not possible to write this query using OFFSET due to
# incompatibilities in how sqlite and postgres support the feature.
# sqlite requires 'LIMIT -1 OFFSET ?', the LIMIT must be present
# While Postgres does not require 'LIMIT', but also does not support
# negative LIMIT values. So there is no way to write it that both can
# support
safe_guard = self.hs.config.max_mau_value - len(self.reserved_users)
# Must be greater than zero for postgres
safe_guard = safe_guard if safe_guard > 0 else 0
query_args = [safe_guard]
base_sql = """
DELETE FROM monthly_active_users
WHERE user_id NOT IN (
SELECT user_id FROM monthly_active_users
ORDER BY timestamp DESC
LIMIT ?
)
"""
# Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
# when len(reserved_users) == 0. Works fine on sqlite.
if len(self.reserved_users) > 0:
query_args.extend(self.reserved_users)
sql = base_sql + """ AND user_id NOT IN ({})""".format(
','.join(questionmarks)
)
else:
sql = base_sql
txn.execute(sql, query_args)
yield self.runInteraction("reap_monthly_active_users", _reap_users)
# It seems poor to invalidate the whole cache, Postgres supports
# 'Returning' which would allow me to invalidate only the
# specific users, but sqlite has no way to do this and instead
# I would need to SELECT and the DELETE which without locking
# is racy.
# Have resolved to invalidate the whole cache for now and do
# something about it if and when the perf becomes significant
self.user_last_seen_monthly_active.invalidate_all()
self.get_monthly_active_count.invalidate_all()
@cached(num_args=0)
def get_monthly_active_count(self):
"""Generates current count of monthly active users
Returns:
Defered[int]: Number of current monthly active users
"""
def _count_users(txn):
sql = "SELECT COALESCE(count(*), 0) FROM monthly_active_users"
txn.execute(sql)
count, = txn.fetchone()
return count
return self.runInteraction("count_users", _count_users)
@defer.inlineCallbacks
def get_registered_reserved_users_count(self):
"""Of the reserved threepids defined in config, how many are associated
with registered users?
Returns:
Defered[int]: Number of real reserved users
"""
count = 0
for tp in self.hs.config.mau_limits_reserved_threepids:
user_id = yield self.hs.get_datastore().get_user_id_by_threepid(
tp["medium"], tp["address"]
)
if user_id:
count = count + 1
defer.returnValue(count)
@defer.inlineCallbacks
def upsert_monthly_active_user(self, user_id):
"""
Updates or inserts monthly active user member
Arguments:
user_id (str): user to add/update
Deferred[bool]: True if a new entry was created, False if an
existing one was updated.
"""
is_insert = yield self._simple_upsert(
desc="upsert_monthly_active_user",
table="monthly_active_users",
keyvalues={
"user_id": user_id,
},
values={
"timestamp": int(self._clock.time_msec()),
},
lock=False,
)
if is_insert:
self.user_last_seen_monthly_active.invalidate((user_id,))
self.get_monthly_active_count.invalidate(())
@cached(num_args=1)
def user_last_seen_monthly_active(self, user_id):
"""
Checks if a given user is part of the monthly active user group
Arguments:
user_id (str): user to add/update
Return:
Deferred[int] : timestamp since last seen, None if never seen
"""
return(self._simple_select_one_onecol(
table="monthly_active_users",
keyvalues={
"user_id": user_id,
},
retcol="timestamp",
allow_none=True,
desc="user_last_seen_monthly_active",
))
@defer.inlineCallbacks
def populate_monthly_active_users(self, user_id):
"""Checks on the state of monthly active user limits and optionally
add the user to the monthly active tables
Args:
user_id(str): the user_id to query
"""
if self.hs.config.limit_usage_by_mau:
# Trial users and guests should not be included as part of MAU group
is_guest = yield self.is_guest(user_id)
if is_guest:
return
is_trial = yield self.is_trial_user(user_id)
if is_trial:
return
last_seen_timestamp = yield self.user_last_seen_monthly_active(user_id)
now = self.hs.get_clock().time_msec()
# We want to reduce to the total number of db writes, and are happy
# to trade accuracy of timestamp in order to lighten load. This means
# We always insert new users (where MAU threshold has not been reached),
# but only update if we have not previously seen the user for
# LAST_SEEN_GRANULARITY ms
if last_seen_timestamp is None:
count = yield self.get_monthly_active_count()
if count < self.hs.config.max_mau_value:
yield self.upsert_monthly_active_user(user_id)
elif now - last_seen_timestamp > LAST_SEEN_GRANULARITY:
yield self.upsert_monthly_active_user(user_id)
|
