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Stop the master relaying USER_SYNC for other workers (#7318) 

Long story short: if we're handling presence on the current worker, we shouldn't be sending USER_SYNC commands over replication.

In an attempt to figure out what is going on here, I ended up refactoring some bits of the presencehandler code, so the first 4 commits here are non-functional refactors to move this code slightly closer to sanity. (There's still plenty to do here :/). Suggest reviewing individual commits.

Fixes (I hope) #7257.
This commit is contained in:
Richard van der Hoff 2020-04-22 22:39:04 +01:00 committed by GitHub
parent 841c581c40
commit 71a1abb8a1
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10 changed files with 199 additions and 159 deletions
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1
changelog.d/7318.misc Normal file
View File

@ -0,0 +1 @@
Move catchup of replication streams logic to worker.

6
docs/tcp_replication.md
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@ -196,7 +196,7 @@ Asks the server for the current position of all streams.
#### USER_SYNC (C)
A user has started or stopped syncing
A user has started or stopped syncing on this process.
#### CLEAR_USER_SYNC (C)
@ -216,10 +216,6 @@ Asks the server for the current position of all streams.
Inform the server a cache should be invalidated
#### SYNC (S, C)
Used exclusively in tests
### REMOTE_SERVER_UP (S, C)
Inform other processes that a remote server may have come back online.

2
synapse/api/constants.py
View File

@ -97,6 +97,8 @@ class EventTypes(object):
Retention = "m.room.retention"
Presence = "m.presence"
class RejectedReason(object):
AUTH_ERROR = "auth_error"

85
synapse/app/generic_worker.py
View File

@ -17,6 +17,9 @@
import contextlib
import logging
import sys
from typing import Dict, Iterable
from typing_extensions import ContextManager
from twisted.internet import defer, reactor
from twisted.web.resource import NoResource
@ -38,14 +41,14 @@ from synapse.config.homeserver import HomeServerConfig
from synapse.config.logger import setup_logging
from synapse.federation import send_queue
from synapse.federation.transport.server import TransportLayerServer
from synapse.handlers.presence import PresenceHandler, get_interested_parties
from synapse.handlers.presence import BasePresenceHandler, get_interested_parties
from synapse.http.server import JsonResource
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.http.site import SynapseSite
from synapse.logging.context import LoggingContext
from synapse.metrics import METRICS_PREFIX, MetricsResource, RegistryProxy
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.replication.slave.storage._base import BaseSlavedStore, __func__
from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.replication.slave.storage.account_data import SlavedAccountDataStore
from synapse.replication.slave.storage.appservice import SlavedApplicationServiceStore
from synapse.replication.slave.storage.client_ips import SlavedClientIpStore
@ -225,23 +228,32 @@ class KeyUploadServlet(RestServlet):
return 200, {"one_time_key_counts": result}
class _NullContextManager(ContextManager[None]):
"""A context manager which does nothing."""
def __exit__(self, exc_type, exc_val, exc_tb):
pass
UPDATE_SYNCING_USERS_MS = 10 * 1000
class GenericWorkerPresence(object):
class GenericWorkerPresence(BasePresenceHandler):
def __init__(self, hs):
super().__init__(hs)
self.hs = hs
self.is_mine_id = hs.is_mine_id
self.http_client = hs.get_simple_http_client()
self.store = hs.get_datastore()
self.user_to_num_current_syncs = {}
self.clock = hs.get_clock()
self._presence_enabled = hs.config.use_presence
# The number of ongoing syncs on this process, by user id.
# Empty if _presence_enabled is false.
self._user_to_num_current_syncs = {} # type: Dict[str, int]
self.notifier = hs.get_notifier()
self.instance_id = hs.get_instance_id()
active_presence = self.store.take_presence_startup_info()
self.user_to_current_state = {state.user_id: state for state in active_presence}
# user_id -> last_sync_ms. Lists the users that have stopped syncing
# but we haven't notified the master of that yet
self.users_going_offline = {}
@ -259,13 +271,13 @@ class GenericWorkerPresence(object):
)
def _on_shutdown(self):
if self.hs.config.use_presence:
if self._presence_enabled:
self.hs.get_tcp_replication().send_command(
ClearUserSyncsCommand(self.instance_id)
)
def send_user_sync(self, user_id, is_syncing, last_sync_ms):
if self.hs.config.use_presence:
if self._presence_enabled:
self.hs.get_tcp_replication().send_user_sync(
self.instance_id, user_id, is_syncing, last_sync_ms
)
@ -307,28 +319,33 @@ class GenericWorkerPresence(object):
# TODO Hows this supposed to work?
return defer.succeed(None)
get_states = __func__(PresenceHandler.get_states)
get_state = __func__(PresenceHandler.get_state)
current_state_for_users = __func__(PresenceHandler.current_state_for_users)
async def user_syncing(
self, user_id: str, affect_presence: bool
) -> ContextManager[None]:
"""Record that a user is syncing.
def user_syncing(self, user_id, affect_presence):
if affect_presence:
curr_sync = self.user_to_num_current_syncs.get(user_id, 0)
self.user_to_num_current_syncs[user_id] = curr_sync + 1
Called by the sync and events servlets to record that a user has connected to
this worker and is waiting for some events.
"""
if not affect_presence or not self._presence_enabled:
return _NullContextManager()
# If we went from no in flight sync to some, notify replication
if self.user_to_num_current_syncs[user_id] == 1:
self.mark_as_coming_online(user_id)
curr_sync = self._user_to_num_current_syncs.get(user_id, 0)
self._user_to_num_current_syncs[user_id] = curr_sync + 1
# If we went from no in flight sync to some, notify replication
if self._user_to_num_current_syncs[user_id] == 1:
self.mark_as_coming_online(user_id)
def _end():
# We check that the user_id is in user_to_num_current_syncs because
# user_to_num_current_syncs may have been cleared if we are
# shutting down.
if affect_presence and user_id in self.user_to_num_current_syncs:
self.user_to_num_current_syncs[user_id] -= 1
if user_id in self._user_to_num_current_syncs:
self._user_to_num_current_syncs[user_id] -= 1
# If we went from one in flight sync to non, notify replication
if self.user_to_num_current_syncs[user_id] == 0:
if self._user_to_num_current_syncs[user_id] == 0:
self.mark_as_going_offline(user_id)
@contextlib.contextmanager
@ -338,7 +355,7 @@ class GenericWorkerPresence(object):
finally:
_end()
return defer.succeed(_user_syncing())
return _user_syncing()
@defer.inlineCallbacks
def notify_from_replication(self, states, stream_id):
@ -373,15 +390,12 @@ class GenericWorkerPresence(object):
stream_id = token
yield self.notify_from_replication(states, stream_id)
def get_currently_syncing_users(self):
if self.hs.config.use_presence:
return [
user_id
for user_id, count in self.user_to_num_current_syncs.items()
if count > 0
]
else:
return set()
def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
return [
user_id
for user_id, count in self._user_to_num_current_syncs.items()
if count > 0
]
class GenericWorkerTyping(object):
@ -625,8 +639,7 @@ class GenericWorkerReplicationHandler(ReplicationDataHandler):
self.store = hs.get_datastore()
self.typing_handler = hs.get_typing_handler()
# NB this is a SynchrotronPresence, not a normal PresenceHandler
self.presence_handler = hs.get_presence_handler()
self.presence_handler = hs.get_presence_handler() # type: GenericWorkerPresence
self.notifier = hs.get_notifier()
self.notify_pushers = hs.config.start_pushers

20
synapse/handlers/events.py
View File

@ -19,6 +19,7 @@ import random
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError, SynapseError
from synapse.events import EventBase
from synapse.handlers.presence import format_user_presence_state
from synapse.logging.utils import log_function
from synapse.types import UserID
from synapse.visibility import filter_events_for_client
@ -97,6 +98,8 @@ class EventStreamHandler(BaseHandler):
explicit_room_id=room_id,
)
time_now = self.clock.time_msec()
# When the user joins a new room, or another user joins a currently
# joined room, we need to send down presence for those users.
to_add = []
@ -112,19 +115,20 @@ class EventStreamHandler(BaseHandler):
users = await self.state.get_current_users_in_room(
event.room_id
)
states = await presence_handler.get_states(users, as_event=True)
to_add.extend(states)
else:
users = [event.state_key]
ev = await presence_handler.get_state(
UserID.from_string(event.state_key), as_event=True
)
to_add.append(ev)
states = await presence_handler.get_states(users)
to_add.extend(
{
"type": EventTypes.Presence,
"content": format_user_presence_state(state, time_now),
}
for state in states
)
events.extend(to_add)
time_now = self.clock.time_msec()
chunks = await self._event_serializer.serialize_events(
events,
time_now,

10
synapse/handlers/initial_sync.py
View File

@ -381,10 +381,16 @@ class InitialSyncHandler(BaseHandler):
return []
states = await presence_handler.get_states(
[m.user_id for m in room_members], as_event=True
[m.user_id for m in room_members]
)
return states
return [
{
"type": EventTypes.Presence,
"content": format_user_presence_state(s, time_now),
}
for s in states
]
async def get_receipts():
receipts = await self.store.get_linearized_receipts_for_room(

210
synapse/handlers/presence.py
View File

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2020 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.
@ -21,10 +22,10 @@ The methods that define policy are:
- PresenceHandler._handle_timeouts
- should_notify
"""
import abc
import logging
from contextlib import contextmanager
from typing import Dict, List, Set
from typing import Dict, Iterable, List, Set
from six import iteritems, itervalues
@ -41,7 +42,7 @@ from synapse.logging.utils import log_function
from synapse.metrics import LaterGauge
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage.presence import UserPresenceState
from synapse.types import UserID, get_domain_from_id
from synapse.types import JsonDict, UserID, get_domain_from_id
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.descriptors import cached
from synapse.util.metrics import Measure
@ -99,13 +100,106 @@ EXTERNAL_PROCESS_EXPIRY = 5 * 60 * 1000
assert LAST_ACTIVE_GRANULARITY < IDLE_TIMER
class PresenceHandler(object):
class BasePresenceHandler(abc.ABC):
"""Parts of the PresenceHandler that are shared between workers and master"""
def __init__(self, hs: "synapse.server.HomeServer"):
self.clock = hs.get_clock()
self.store = hs.get_datastore()
active_presence = self.store.take_presence_startup_info()
self.user_to_current_state = {state.user_id: state for state in active_presence}
@abc.abstractmethod
async def user_syncing(
self, user_id: str, affect_presence: bool
) -> ContextManager[None]:
"""Returns a context manager that should surround any stream requests
from the user.
This allows us to keep track of who is currently streaming and who isn't
without having to have timers outside of this module to avoid flickering
when users disconnect/reconnect.
Args:
user_id: the user that is starting a sync
affect_presence: If false this function will be a no-op.
Useful for streams that are not associated with an actual
client that is being used by a user.
"""
@abc.abstractmethod
def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
"""Get an iterable of syncing users on this worker, to send to the presence handler
This is called when a replication connection is established. It should return
a list of user ids, which are then sent as USER_SYNC commands to inform the
process handling presence about those users.
Returns:
An iterable of user_id strings.
"""
async def get_state(self, target_user: UserID) -> UserPresenceState:
results = await self.get_states([target_user.to_string()])
return results[0]
async def get_states(
self, target_user_ids: Iterable[str]
) -> List[UserPresenceState]:
"""Get the presence state for users."""
updates_d = await self.current_state_for_users(target_user_ids)
updates = list(updates_d.values())
for user_id in set(target_user_ids) - {u.user_id for u in updates}:
updates.append(UserPresenceState.default(user_id))
return updates
async def current_state_for_users(
self, user_ids: Iterable[str]
) -> Dict[str, UserPresenceState]:
"""Get the current presence state for multiple users.
Returns:
dict: `user_id` -> `UserPresenceState`
"""
states = {
user_id: self.user_to_current_state.get(user_id, None)
for user_id in user_ids
}
missing = [user_id for user_id, state in iteritems(states) if not state]
if missing:
# There are things not in our in memory cache. Lets pull them out of
# the database.
res = await self.store.get_presence_for_users(missing)
states.update(res)
missing = [user_id for user_id, state in iteritems(states) if not state]
if missing:
new = {
user_id: UserPresenceState.default(user_id) for user_id in missing
}
states.update(new)
self.user_to_current_state.update(new)
return states
@abc.abstractmethod
async def set_state(
self, target_user: UserID, state: JsonDict, ignore_status_msg: bool = False
) -> None:
"""Set the presence state of the user. """
class PresenceHandler(BasePresenceHandler):
def __init__(self, hs: "synapse.server.HomeServer"):
super().__init__(hs)
self.hs = hs
self.is_mine_id = hs.is_mine_id
self.server_name = hs.hostname
self.clock = hs.get_clock()
self.store = hs.get_datastore()
self.wheel_timer = WheelTimer()
self.notifier = hs.get_notifier()
self.federation = hs.get_federation_sender()
@ -115,13 +209,6 @@ class PresenceHandler(object):
federation_registry.register_edu_handler("m.presence", self.incoming_presence)
active_presence = self.store.take_presence_startup_info()
# A dictionary of the current state of users. This is prefilled with
# non-offline presence from the DB. We should fetch from the DB if
# we can't find a users presence in here.
self.user_to_current_state = {state.user_id: state for state in active_presence}
LaterGauge(
"synapse_handlers_presence_user_to_current_state_size",
"",
@ -130,7 +217,7 @@ class PresenceHandler(object):
)
now = self.clock.time_msec()
for state in active_presence:
for state in self.user_to_current_state.values():
self.wheel_timer.insert(
now=now, obj=state.user_id, then=state.last_active_ts + IDLE_TIMER
)
@ -361,10 +448,18 @@ class PresenceHandler(object):
timers_fired_counter.inc(len(states))
syncing_user_ids = {
user_id
for user_id, count in self.user_to_num_current_syncs.items()
if count
}
for user_ids in self.external_process_to_current_syncs.values():
syncing_user_ids.update(user_ids)
changes = handle_timeouts(
states,
is_mine_fn=self.is_mine_id,
syncing_user_ids=self.get_currently_syncing_users(),
syncing_user_ids=syncing_user_ids,
now=now,
)
@ -462,22 +557,9 @@ class PresenceHandler(object):
return _user_syncing()
def get_currently_syncing_users(self):
"""Get the set of user ids that are currently syncing on this HS.
Returns:
set(str): A set of user_id strings.
"""
if self.hs.config.use_presence:
syncing_user_ids = {
user_id
for user_id, count in self.user_to_num_current_syncs.items()
if count
}
for user_ids in self.external_process_to_current_syncs.values():
syncing_user_ids.update(user_ids)
return syncing_user_ids
else:
return set()
def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
# since we are the process handling presence, there is nothing to do here.
return []
async def update_external_syncs_row(
self, process_id, user_id, is_syncing, sync_time_msec
@ -554,34 +636,6 @@ class PresenceHandler(object):
res = await self.current_state_for_users([user_id])
return res[user_id]
async def current_state_for_users(self, user_ids):
"""Get the current presence state for multiple users.
Returns:
dict: `user_id` -> `UserPresenceState`
"""
states = {
user_id: self.user_to_current_state.get(user_id, None)
for user_id in user_ids
}
missing = [user_id for user_id, state in iteritems(states) if not state]
if missing:
# There are things not in our in memory cache. Lets pull them out of
# the database.
res = await self.store.get_presence_for_users(missing)
states.update(res)
missing = [user_id for user_id, state in iteritems(states) if not state]
if missing:
new = {
user_id: UserPresenceState.default(user_id) for user_id in missing
}
states.update(new)
self.user_to_current_state.update(new)
return states
async def _persist_and_notify(self, states):
"""Persist states in the database, poke the notifier and send to
interested remote servers
@ -669,40 +723,6 @@ class PresenceHandler(object):
federation_presence_counter.inc(len(updates))
await self._update_states(updates)
async def get_state(self, target_user, as_event=False):
results = await self.get_states([target_user.to_string()], as_event=as_event)
return results[0]
async def get_states(self, target_user_ids, as_event=False):
"""Get the presence state for users.
Args:
target_user_ids (list)
as_event (bool): Whether to format it as a client event or not.
Returns:
list
"""
updates = await self.current_state_for_users(target_user_ids)
updates = list(updates.values())
for user_id in set(target_user_ids) - {u.user_id for u in updates}:
updates.append(UserPresenceState.default(user_id))
now = self.clock.time_msec()
if as_event:
return [
{
"type": "m.presence",
"content": format_user_presence_state(state, now),
}
for state in updates
]
else:
return updates
async def set_state(self, target_user, state, ignore_status_msg=False):
"""Set the presence state of the user.
"""
@ -889,7 +909,7 @@ class PresenceHandler(object):
user_ids = await self.state.get_current_users_in_room(room_id)
user_ids = list(filter(self.is_mine_id, user_ids))
states = await self.current_state_for_users(user_ids)
states_d = await self.current_state_for_users(user_ids)
# Filter out old presence, i.e. offline presence states where
# the user hasn't been active for a week. We can change this
@ -899,7 +919,7 @@ class PresenceHandler(object):
now = self.clock.time_msec()
states = [
state
for state in states.values()
for state in states_d.values()
if state.state != PresenceState.OFFLINE
or now - state.last_active_ts < 7 * 24 * 60 * 60 * 1000
or state.status_msg is not None

7
synapse/replication/tcp/commands.py
View File

@ -210,7 +210,10 @@ class ReplicateCommand(Command):
class UserSyncCommand(Command):
"""Sent by the client to inform the server that a user has started or
stopped syncing. Used to calculate presence on the master.
stopped syncing on this process.
This is used by the process handling presence (typically the master) to
calculate who is online and who is not.
Includes a timestamp of when the last user sync was.
@ -218,7 +221,7 @@ class UserSyncCommand(Command):
USER_SYNC <instance_id> <user_id> <state> <last_sync_ms>
Where <state> is either "start" or "stop"
Where <state> is either "start" or "end"
"""
NAME = "USER_SYNC"

15
synapse/replication/tcp/handler.py
View File

@ -337,13 +337,6 @@ class ReplicationCommandHandler:
if self._is_master:
self._notifier.notify_remote_server_up(cmd.data)
def get_currently_syncing_users(self):
"""Get the list of currently syncing users (if any). This is called
when a connection has been established and we need to send the
currently syncing users.
"""
return self._presence_handler.get_currently_syncing_users()
def new_connection(self, connection: AbstractConnection):
"""Called when we have a new connection.
"""
@ -361,9 +354,11 @@ class ReplicationCommandHandler:
if self._factory:
self._factory.resetDelay()
# Tell the server if we have any users currently syncing (should only
# happen on synchrotrons)
currently_syncing = self.get_currently_syncing_users()
# Tell the other end if we have any users currently syncing.
currently_syncing = (
self._presence_handler.get_currently_syncing_users_for_replication()
)
now = self._clock.time_msec()
for user_id in currently_syncing:
connection.send_command(

2
synapse/server.pyi
View File

@ -97,7 +97,7 @@ class HomeServer(object):
pass
def get_notifier(self) -> synapse.notifier.Notifier:
pass
def get_presence_handler(self) -> synapse.handlers.presence.PresenceHandler:
def get_presence_handler(self) -> synapse.handlers.presence.BasePresenceHandler:
pass
def get_clock(self) -> synapse.util.Clock:
pass