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anonymousland-synapse/synapse/storage/databases/main/__init__.py
Erik Johnston f112cfe5bb
Fix MultiWriteIdGenerator's handling of restarts. (#8374) 
On startup `MultiWriteIdGenerator` fetches the maximum stream ID for
each instance from the table and uses that as its initial "current
position" for each writer. This is problematic as a) it involves either
a scan of events table or an index (neither of which is ideal), and b)
if rows are being persisted out of order elsewhere while the process
restarts then using the maximum stream ID is not correct. This could
theoretically lead to race conditions where e.g. events that are
persisted out of order are not sent down sync streams.

We fix this by creating a new table that tracks the current positions of
each writer to the stream, and update it each time we finish persisting
a new entry. This is a relatively small overhead when persisting events.
However for the cache invalidation stream this is a much bigger relative
overhead, so instead we note that for invalidation we don't actually
care about reliability over restarts (as there's no caches to
invalidate) and simply don't bother reading and writing to the new table
in that particular case.
2020-09-24 16:53:51 +01:00

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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
# 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.
import calendar
import logging
import time
from typing import Any, Dict, List, Optional, Tuple
from synapse.api.constants import PresenceState
from synapse.config.homeserver import HomeServerConfig
from synapse.storage.database import DatabasePool
from synapse.storage.engines import PostgresEngine
from synapse.storage.util.id_generators import (
IdGenerator,
MultiWriterIdGenerator,
StreamIdGenerator,
)
from synapse.types import get_domain_from_id
from synapse.util.caches.stream_change_cache import StreamChangeCache
from .account_data import AccountDataStore
from .appservice import ApplicationServiceStore, ApplicationServiceTransactionStore
from .cache import CacheInvalidationWorkerStore
from .censor_events import CensorEventsStore
from .client_ips import ClientIpStore
from .deviceinbox import DeviceInboxStore
from .devices import DeviceStore
from .directory import DirectoryStore
from .e2e_room_keys import EndToEndRoomKeyStore
from .end_to_end_keys import EndToEndKeyStore
from .event_federation import EventFederationStore
from .event_push_actions import EventPushActionsStore
from .events_bg_updates import EventsBackgroundUpdatesStore
from .filtering import FilteringStore
from .group_server import GroupServerStore
from .keys import KeyStore
from .media_repository import MediaRepositoryStore
from .metrics import ServerMetricsStore
from .monthly_active_users import MonthlyActiveUsersStore
from .openid import OpenIdStore
from .presence import PresenceStore, UserPresenceState
from .profile import ProfileStore
from .purge_events import PurgeEventsStore
from .push_rule import PushRuleStore
from .pusher import PusherStore
from .receipts import ReceiptsStore
from .registration import RegistrationStore
from .rejections import RejectionsStore
from .relations import RelationsStore
from .room import RoomStore
from .roommember import RoomMemberStore
from .search import SearchStore
from .signatures import SignatureStore
from .state import StateStore
from .stats import StatsStore
from .stream import StreamStore
from .tags import TagsStore
from .transactions import TransactionStore
from .ui_auth import UIAuthStore
from .user_directory import UserDirectoryStore
from .user_erasure_store import UserErasureStore
logger = logging.getLogger(__name__)
class DataStore(
EventsBackgroundUpdatesStore,
RoomMemberStore,
RoomStore,
RegistrationStore,
StreamStore,
ProfileStore,
PresenceStore,
TransactionStore,
DirectoryStore,
KeyStore,
StateStore,
SignatureStore,
ApplicationServiceStore,
PurgeEventsStore,
EventFederationStore,
MediaRepositoryStore,
RejectionsStore,
FilteringStore,
PusherStore,
PushRuleStore,
ApplicationServiceTransactionStore,
ReceiptsStore,
EndToEndKeyStore,
EndToEndRoomKeyStore,
SearchStore,
TagsStore,
AccountDataStore,
EventPushActionsStore,
OpenIdStore,
ClientIpStore,
DeviceStore,
DeviceInboxStore,
UserDirectoryStore,
GroupServerStore,
UserErasureStore,
MonthlyActiveUsersStore,
StatsStore,
RelationsStore,
CensorEventsStore,
UIAuthStore,
CacheInvalidationWorkerStore,
ServerMetricsStore,
):
def __init__(self, database: DatabasePool, db_conn, hs):
self.hs = hs
self._clock = hs.get_clock()
self.database_engine = database.engine
self._presence_id_gen = StreamIdGenerator(
db_conn, "presence_stream", "stream_id"
)
self._device_inbox_id_gen = StreamIdGenerator(
db_conn, "device_inbox", "stream_id"
)
self._public_room_id_gen = StreamIdGenerator(
db_conn, "public_room_list_stream", "stream_id"
)
self._device_list_id_gen = StreamIdGenerator(
db_conn,
"device_lists_stream",
"stream_id",
extra_tables=[
("user_signature_stream", "stream_id"),
("device_lists_outbound_pokes", "stream_id"),
],
)
self._cross_signing_id_gen = StreamIdGenerator(
db_conn, "e2e_cross_signing_keys", "stream_id"
)
self._access_tokens_id_gen = IdGenerator(db_conn, "access_tokens", "id")
self._event_reports_id_gen = IdGenerator(db_conn, "event_reports", "id")
self._push_rule_id_gen = IdGenerator(db_conn, "push_rules", "id")
self._push_rules_enable_id_gen = IdGenerator(db_conn, "push_rules_enable", "id")
self._pushers_id_gen = StreamIdGenerator(
db_conn, "pushers", "id", extra_tables=[("deleted_pushers", "stream_id")]
)
self._group_updates_id_gen = StreamIdGenerator(
db_conn, "local_group_updates", "stream_id"
)
if isinstance(self.database_engine, PostgresEngine):
# We set the `writers` to an empty list here as we don't care about
# missing updates over restarts, as we'll not have anything in our
# caches to invalidate. (This reduces the amount of writes to the DB
# that happen).
self._cache_id_gen = MultiWriterIdGenerator(
db_conn,
database,
stream_name="caches",
instance_name=hs.get_instance_name(),
table="cache_invalidation_stream_by_instance",
instance_column="instance_name",
id_column="stream_id",
sequence_name="cache_invalidation_stream_seq",
writers=[],
)
else:
self._cache_id_gen = None
super().__init__(database, db_conn, hs)
self._presence_on_startup = self._get_active_presence(db_conn)
presence_cache_prefill, min_presence_val = self.db_pool.get_cache_dict(
db_conn,
"presence_stream",
entity_column="user_id",
stream_column="stream_id",
max_value=self._presence_id_gen.get_current_token(),
)
self.presence_stream_cache = StreamChangeCache(
"PresenceStreamChangeCache",
min_presence_val,
prefilled_cache=presence_cache_prefill,
)
max_device_inbox_id = self._device_inbox_id_gen.get_current_token()
device_inbox_prefill, min_device_inbox_id = self.db_pool.get_cache_dict(
db_conn,
"device_inbox",
entity_column="user_id",
stream_column="stream_id",
max_value=max_device_inbox_id,
limit=1000,
)
self._device_inbox_stream_cache = StreamChangeCache(
"DeviceInboxStreamChangeCache",
min_device_inbox_id,
prefilled_cache=device_inbox_prefill,
)
# The federation outbox and the local device inbox uses the same
# stream_id generator.
device_outbox_prefill, min_device_outbox_id = self.db_pool.get_cache_dict(
db_conn,
"device_federation_outbox",
entity_column="destination",
stream_column="stream_id",
max_value=max_device_inbox_id,
limit=1000,
)
self._device_federation_outbox_stream_cache = StreamChangeCache(
"DeviceFederationOutboxStreamChangeCache",
min_device_outbox_id,
prefilled_cache=device_outbox_prefill,
)
device_list_max = self._device_list_id_gen.get_current_token()
self._device_list_stream_cache = StreamChangeCache(
"DeviceListStreamChangeCache", device_list_max
)
self._user_signature_stream_cache = StreamChangeCache(
"UserSignatureStreamChangeCache", device_list_max
)
self._device_list_federation_stream_cache = StreamChangeCache(
"DeviceListFederationStreamChangeCache", device_list_max
)
events_max = self._stream_id_gen.get_current_token()
curr_state_delta_prefill, min_curr_state_delta_id = self.db_pool.get_cache_dict(
db_conn,
"current_state_delta_stream",
entity_column="room_id",
stream_column="stream_id",
max_value=events_max, # As we share the stream id with events token
limit=1000,
)
self._curr_state_delta_stream_cache = StreamChangeCache(
"_curr_state_delta_stream_cache",
min_curr_state_delta_id,
prefilled_cache=curr_state_delta_prefill,
)
_group_updates_prefill, min_group_updates_id = self.db_pool.get_cache_dict(
db_conn,
"local_group_updates",
entity_column="user_id",
stream_column="stream_id",
max_value=self._group_updates_id_gen.get_current_token(),
limit=1000,
)
self._group_updates_stream_cache = StreamChangeCache(
"_group_updates_stream_cache",
min_group_updates_id,
prefilled_cache=_group_updates_prefill,
)
self._stream_order_on_start = self.get_room_max_stream_ordering()
self._min_stream_order_on_start = self.get_room_min_stream_ordering()
# Used in _generate_user_daily_visits to keep track of progress
self._last_user_visit_update = self._get_start_of_day()
def get_device_stream_token(self) -> int:
return self._device_list_id_gen.get_current_token()
def take_presence_startup_info(self):
active_on_startup = self._presence_on_startup
self._presence_on_startup = None
return active_on_startup
def _get_active_presence(self, db_conn):
"""Fetch non-offline presence from the database so that we can register
the appropriate time outs.
"""
sql = (
"SELECT user_id, state, last_active_ts, last_federation_update_ts,"
" last_user_sync_ts, status_msg, currently_active FROM presence_stream"
" WHERE state != ?"
)
sql = self.database_engine.convert_param_style(sql)
txn = db_conn.cursor()
txn.execute(sql, (PresenceState.OFFLINE,))
rows = self.db_pool.cursor_to_dict(txn)
txn.close()
for row in rows:
row["currently_active"] = bool(row["currently_active"])
return [UserPresenceState(**row) for row in rows]
async def count_daily_users(self) -> int:
"""
Counts the number of users who used this homeserver in the last 24 hours.
"""
yesterday = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24)
return await self.db_pool.runInteraction(
"count_daily_users", self._count_users, yesterday
)
async def count_monthly_users(self) -> int:
"""
Counts the number of users who used this homeserver in the last 30 days.
Note this method is intended for phonehome metrics only and is different
from the mau figure in synapse.storage.monthly_active_users which,
amongst other things, includes a 3 day grace period before a user counts.
"""
thirty_days_ago = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
return await self.db_pool.runInteraction(
"count_monthly_users", self._count_users, thirty_days_ago
)
def _count_users(self, txn, time_from):
"""
Returns number of users seen in the past time_from period
"""
sql = """
SELECT COALESCE(count(*), 0) FROM (
SELECT user_id FROM user_ips
WHERE last_seen > ?
GROUP BY user_id
) u
"""
txn.execute(sql, (time_from,))
(count,) = txn.fetchone()
return count
async def count_r30_users(self) -> Dict[str, int]:
"""
Counts the number of 30 day retained users, defined as:-
* Users who have created their accounts more than 30 days ago
* Where last seen at most 30 days ago
* Where account creation and last_seen are > 30 days apart
Returns:
A mapping of counts globally as well as broken out by platform.
"""
def _count_r30_users(txn):
thirty_days_in_secs = 86400 * 30
now = int(self._clock.time())
thirty_days_ago_in_secs = now - thirty_days_in_secs
sql = """
SELECT platform, COALESCE(count(*), 0) FROM (
SELECT
users.name, platform, users.creation_ts * 1000,
MAX(uip.last_seen)
FROM users
INNER JOIN (
SELECT
user_id,
last_seen,
CASE
WHEN user_agent LIKE '%%Android%%' THEN 'android'
WHEN user_agent LIKE '%%iOS%%' THEN 'ios'
WHEN user_agent LIKE '%%Electron%%' THEN 'electron'
WHEN user_agent LIKE '%%Mozilla%%' THEN 'web'
WHEN user_agent LIKE '%%Gecko%%' THEN 'web'
ELSE 'unknown'
END
AS platform
FROM user_ips
) uip
ON users.name = uip.user_id
AND users.appservice_id is NULL
AND users.creation_ts < ?
AND uip.last_seen/1000 > ?
AND (uip.last_seen/1000) - users.creation_ts > 86400 * 30
GROUP BY users.name, platform, users.creation_ts
) u GROUP BY platform
"""
results = {}
txn.execute(sql, (thirty_days_ago_in_secs, thirty_days_ago_in_secs))
for row in txn:
if row[0] == "unknown":
pass
results[row[0]] = row[1]
sql = """
SELECT COALESCE(count(*), 0) FROM (
SELECT users.name, users.creation_ts * 1000,
MAX(uip.last_seen)
FROM users
INNER JOIN (
SELECT
user_id,
last_seen
FROM user_ips
) uip
ON users.name = uip.user_id
AND appservice_id is NULL
AND users.creation_ts < ?
AND uip.last_seen/1000 > ?
AND (uip.last_seen/1000) - users.creation_ts > 86400 * 30
GROUP BY users.name, users.creation_ts
) u
"""
txn.execute(sql, (thirty_days_ago_in_secs, thirty_days_ago_in_secs))
(count,) = txn.fetchone()
results["all"] = count
return results
return await self.db_pool.runInteraction("count_r30_users", _count_r30_users)
def _get_start_of_day(self):
"""
Returns millisecond unixtime for start of UTC day.
"""
now = time.gmtime()
today_start = calendar.timegm((now.tm_year, now.tm_mon, now.tm_mday, 0, 0, 0))
return today_start * 1000
async def generate_user_daily_visits(self) -> None:
"""
Generates daily visit data for use in cohort/ retention analysis
"""
def _generate_user_daily_visits(txn):
logger.info("Calling _generate_user_daily_visits")
today_start = self._get_start_of_day()
a_day_in_milliseconds = 24 * 60 * 60 * 1000
now = self.clock.time_msec()
sql = """
INSERT INTO user_daily_visits (user_id, device_id, timestamp)
SELECT u.user_id, u.device_id, ?
FROM user_ips AS u
LEFT JOIN (
SELECT user_id, device_id, timestamp FROM user_daily_visits
WHERE timestamp = ?
) udv
ON u.user_id = udv.user_id AND u.device_id=udv.device_id
INNER JOIN users ON users.name=u.user_id
WHERE last_seen > ? AND last_seen <= ?
AND udv.timestamp IS NULL AND users.is_guest=0
AND users.appservice_id IS NULL
GROUP BY u.user_id, u.device_id
"""
# This means that the day has rolled over but there could still
# be entries from the previous day. There is an edge case
# where if the user logs in at 23:59 and overwrites their
# last_seen at 00:01 then they will not be counted in the
# previous day's stats - it is important that the query is run
# often to minimise this case.
if today_start > self._last_user_visit_update:
yesterday_start = today_start - a_day_in_milliseconds
txn.execute(
sql,
(
yesterday_start,
yesterday_start,
self._last_user_visit_update,
today_start,
),
)
self._last_user_visit_update = today_start
txn.execute(
sql, (today_start, today_start, self._last_user_visit_update, now)
)
# Update _last_user_visit_update to now. The reason to do this
# rather just clamping to the beginning of the day is to limit
# the size of the join - meaning that the query can be run more
# frequently
self._last_user_visit_update = now
await self.db_pool.runInteraction(
"generate_user_daily_visits", _generate_user_daily_visits
)
async def get_users(self) -> List[Dict[str, Any]]:
"""Function to retrieve a list of users in users table.
Returns:
A list of dictionaries representing users.
"""
return await self.db_pool.simple_select_list(
table="users",
keyvalues={},
retcols=[
"name",
"password_hash",
"is_guest",
"admin",
"user_type",
"deactivated",
],
desc="get_users",
)
async def get_users_paginate(
self,
start: int,
limit: int,
user_id: Optional[str] = None,
name: Optional[str] = None,
guests: bool = True,
deactivated: bool = False,
) -> Tuple[List[Dict[str, Any]], int]:
"""Function to retrieve a paginated list of users from
users list. This will return a json list of users and the
total number of users matching the filter criteria.
Args:
start: start number to begin the query from
limit: number of rows to retrieve
user_id: search for user_id. ignored if name is not None
name: search for local part of user_id or display name
guests: whether to in include guest users
deactivated: whether to include deactivated users
Returns:
A tuple of a list of mappings from user to information and a count of total users.
"""
def get_users_paginate_txn(txn):
filters = []
args = [self.hs.config.server_name]
if name:
filters.append("(name LIKE ? OR displayname LIKE ?)")
args.extend(["@%" + name + "%:%", "%" + name + "%"])
elif user_id:
filters.append("name LIKE ?")
args.extend(["%" + user_id + "%"])
if not guests:
filters.append("is_guest = 0")
if not deactivated:
filters.append("deactivated = 0")
where_clause = "WHERE " + " AND ".join(filters) if len(filters) > 0 else ""
sql_base = """
FROM users as u
LEFT JOIN profiles AS p ON u.name = '@' || p.user_id || ':' || ?
{}
""".format(
where_clause
)
sql = "SELECT COUNT(*) as total_users " + sql_base
txn.execute(sql, args)
count = txn.fetchone()[0]
sql = (
"SELECT name, user_type, is_guest, admin, deactivated, displayname, avatar_url "
+ sql_base
+ " ORDER BY u.name LIMIT ? OFFSET ?"
)
args += [limit, start]
txn.execute(sql, args)
users = self.db_pool.cursor_to_dict(txn)
return users, count
return await self.db_pool.runInteraction(
"get_users_paginate_txn", get_users_paginate_txn
)
async def search_users(self, term: str) -> Optional[List[Dict[str, Any]]]:
"""Function to search users list for one or more users with
the matched term.
Args:
term: search term
Returns:
A list of dictionaries or None.
"""
return await self.db_pool.simple_search_list(
table="users",
term=term,
col="name",
retcols=["name", "password_hash", "is_guest", "admin", "user_type"],
desc="search_users",
)
def check_database_before_upgrade(cur, database_engine, config: HomeServerConfig):
"""Called before upgrading an existing database to check that it is broadly sane
compared with the configuration.
"""
logger.info("Checking database for consistency with configuration...")
# if there are any users in the database, check that the username matches our
# configured server name.
cur.execute("SELECT name FROM users LIMIT 1")
rows = cur.fetchall()
if not rows:
return
user_domain = get_domain_from_id(rows[0][0])
if user_domain == config.server_name:
return
raise Exception(
"Found users in database not native to %s!\n"
"You cannot change a synapse server_name after it's been configured"
% (config.server_name,)
)
__all__ = ["DataStore", "check_database_before_upgrade"]
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