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Merge pull request #4942 from matrix-org/erikj/fix_presence 

Use event streams to calculate presence
This commit is contained in:
Erik Johnston 2019-03-28 14:38:31 +00:00 committed by GitHub
parent 4eeb2c2f07 4e5f0f7ca0
commit 248014379e
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 412 additions and 33 deletions
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1
changelog.d/4942.bugfix Normal file
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@ -0,0 +1 @@
Fix bug where presence updates were sent to all servers in a room when a new server joined, rather than to just the new server.

73
synapse/federation/send_queue.py
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@ -55,7 +55,12 @@ class FederationRemoteSendQueue(object):
self.is_mine_id = hs.is_mine_id
self.presence_map = {} # Pending presence map user_id -> UserPresenceState
self.presence_changed = SortedDict() # Stream position -> user_id
self.presence_changed = SortedDict() # Stream position -> list[user_id]
# Stores the destinations we need to explicitly send presence to about a
# given user.
# Stream position -> (user_id, destinations)
self.presence_destinations = SortedDict()
self.keyed_edu = {} # (destination, key) -> EDU
self.keyed_edu_changed = SortedDict() # stream position -> (destination, key)
@ -77,7 +82,7 @@ class FederationRemoteSendQueue(object):
for queue_name in [
"presence_map", "presence_changed", "keyed_edu", "keyed_edu_changed",
"edus", "device_messages", "pos_time",
"edus", "device_messages", "pos_time", "presence_destinations",
]:
register(queue_name, getattr(self, queue_name))
@ -121,6 +126,15 @@ class FederationRemoteSendQueue(object):
for user_id in uids
)
keys = self.presence_destinations.keys()
i = self.presence_destinations.bisect_left(position_to_delete)
for key in keys[:i]:
del self.presence_destinations[key]
user_ids.update(
user_id for user_id, _ in self.presence_destinations.values()
)
to_del = [
user_id for user_id in self.presence_map if user_id not in user_ids
]
@ -209,6 +223,20 @@ class FederationRemoteSendQueue(object):
self.notifier.on_new_replication_data()
def send_presence_to_destinations(self, states, destinations):
"""As per FederationSender
Args:
states (list[UserPresenceState])
destinations (list[str])
"""
for state in states:
pos = self._next_pos()
self.presence_map.update({state.user_id: state for state in states})
self.presence_destinations[pos] = (state.user_id, destinations)
self.notifier.on_new_replication_data()
def send_device_messages(self, destination):
"""As per FederationSender"""
pos = self._next_pos()
@ -261,6 +289,16 @@ class FederationRemoteSendQueue(object):
state=self.presence_map[user_id],
)))
# Fetch presence to send to destinations
i = self.presence_destinations.bisect_right(from_token)
j = self.presence_destinations.bisect_right(to_token) + 1
for pos, (user_id, dests) in self.presence_destinations.items()[i:j]:
rows.append((pos, PresenceDestinationsRow(
state=self.presence_map[user_id],
destinations=list(dests),
)))
# Fetch changes keyed edus
i = self.keyed_edu_changed.bisect_right(from_token)
j = self.keyed_edu_changed.bisect_right(to_token) + 1
@ -357,6 +395,29 @@ class PresenceRow(BaseFederationRow, namedtuple("PresenceRow", (
buff.presence.append(self.state)
class PresenceDestinationsRow(BaseFederationRow, namedtuple("PresenceDestinationsRow", (
"state", # UserPresenceState
"destinations", # list[str]
))):
TypeId = "pd"
@staticmethod
def from_data(data):
return PresenceDestinationsRow(
state=UserPresenceState.from_dict(data["state"]),
destinations=data["dests"],
)
def to_data(self):
return {
"state": self.state.as_dict(),
"dests": self.destinations,
}
def add_to_buffer(self, buff):
buff.presence_destinations.append((self.state, self.destinations))
class KeyedEduRow(BaseFederationRow, namedtuple("KeyedEduRow", (
"key", # tuple(str) - the edu key passed to send_edu
"edu", # Edu
@ -428,6 +489,7 @@ TypeToRow = {
Row.TypeId: Row
for Row in (
PresenceRow,
PresenceDestinationsRow,
KeyedEduRow,
EduRow,
DeviceRow,
@ -437,6 +499,7 @@ TypeToRow = {
ParsedFederationStreamData = namedtuple("ParsedFederationStreamData", (
"presence", # list(UserPresenceState)
"presence_destinations", # list of tuples of UserPresenceState and destinations
"keyed_edus", # dict of destination -> { key -> Edu }
"edus", # dict of destination -> [Edu]
"device_destinations", # set of destinations
@ -458,6 +521,7 @@ def process_rows_for_federation(transaction_queue, rows):
buff = ParsedFederationStreamData(
presence=[],
presence_destinations=[],
keyed_edus={},
edus={},
device_destinations=set(),
@ -476,6 +540,11 @@ def process_rows_for_federation(transaction_queue, rows):
if buff.presence:
transaction_queue.send_presence(buff.presence)
for state, destinations in buff.presence_destinations:
transaction_queue.send_presence_to_destinations(
states=[state], destinations=destinations,
)
for destination, edu_map in iteritems(buff.keyed_edus):
for key, edu in edu_map.items():
transaction_queue.send_edu(edu, key)

19
synapse/federation/sender/__init__.py
View File

@ -371,7 +371,7 @@ class FederationSender(object):
return
# First we queue up the new presence by user ID, so multiple presence
# updates in quick successtion are correctly handled
# updates in quick succession are correctly handled.
# We only want to send presence for our own users, so lets always just
# filter here just in case.
self.pending_presence.update({
@ -402,6 +402,23 @@ class FederationSender(object):
finally:
self._processing_pending_presence = False
def send_presence_to_destinations(self, states, destinations):
"""Send the given presence states to the given destinations.
Args:
states (list[UserPresenceState])
destinations (list[str])
"""
if not states or not self.hs.config.use_presence:
# No-op if presence is disabled.
return
for destination in destinations:
if destination == self.server_name:
continue
self._get_per_destination_queue(destination).send_presence(states)
@measure_func("txnqueue._process_presence")
@defer.inlineCallbacks
def _process_presence_inner(self, states):

176
synapse/handlers/presence.py
View File

@ -31,9 +31,11 @@ from prometheus_client import Counter
from twisted.internet import defer
from synapse.api.constants import PresenceState
import synapse.metrics
from synapse.api.constants import EventTypes, Membership, PresenceState
from synapse.api.errors import SynapseError
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.util.async_helpers import Linearizer
@ -98,6 +100,7 @@ class PresenceHandler(object):
self.hs = hs
self.is_mine = hs.is_mine
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()
@ -132,9 +135,6 @@ class PresenceHandler(object):
)
)
distributor = hs.get_distributor()
distributor.observe("user_joined_room", self.user_joined_room)
active_presence = self.store.take_presence_startup_info()
# A dictionary of the current state of users. This is prefilled with
@ -220,6 +220,15 @@ class PresenceHandler(object):
LaterGauge("synapse_handlers_presence_wheel_timer_size", "", [],
lambda: len(self.wheel_timer))
# Used to handle sending of presence to newly joined users/servers
if hs.config.use_presence:
self.notifier.add_replication_callback(self.notify_new_event)
# Presence is best effort and quickly heals itself, so lets just always
# stream from the current state when we restart.
self._event_pos = self.store.get_current_events_token()
self._event_processing = False
@defer.inlineCallbacks
def _on_shutdown(self):
"""Gets called when shutting down. This lets us persist any updates that
@ -750,31 +759,6 @@ class PresenceHandler(object):
yield self._update_states([prev_state.copy_and_replace(**new_fields)])
@defer.inlineCallbacks
def user_joined_room(self, user, room_id):
"""Called (via the distributor) when a user joins a room. This funciton
sends presence updates to servers, either:
1. the joining user is a local user and we send their presence to
all servers in the room.
2. the joining user is a remote user and so we send presence for all
local users in the room.
"""
# We only need to send presence to servers that don't have it yet. We
# don't need to send to local clients here, as that is done as part
# of the event stream/sync.
# TODO: Only send to servers not already in the room.
if self.is_mine(user):
state = yield self.current_state_for_user(user.to_string())
self._push_to_remotes([state])
else:
user_ids = yield self.store.get_users_in_room(room_id)
user_ids = list(filter(self.is_mine_id, user_ids))
states = yield self.current_state_for_users(user_ids)
self._push_to_remotes(list(states.values()))
@defer.inlineCallbacks
def get_presence_list(self, observer_user, accepted=None):
"""Returns the presence for all users in their presence list.
@ -945,6 +929,140 @@ class PresenceHandler(object):
rows = yield self.store.get_all_presence_updates(last_id, current_id)
defer.returnValue(rows)
def notify_new_event(self):
"""Called when new events have happened. Handles users and servers
joining rooms and require being sent presence.
"""
if self._event_processing:
return
@defer.inlineCallbacks
def _process_presence():
assert not self._event_processing
self._event_processing = True
try:
yield self._unsafe_process()
finally:
self._event_processing = False
run_as_background_process("presence.notify_new_event", _process_presence)
@defer.inlineCallbacks
def _unsafe_process(self):
# Loop round handling deltas until we're up to date
while True:
with Measure(self.clock, "presence_delta"):
deltas = yield self.store.get_current_state_deltas(self._event_pos)
if not deltas:
return
yield self._handle_state_delta(deltas)
self._event_pos = deltas[-1]["stream_id"]
# Expose current event processing position to prometheus
synapse.metrics.event_processing_positions.labels("presence").set(
self._event_pos
)
@defer.inlineCallbacks
def _handle_state_delta(self, deltas):
"""Process current state deltas to find new joins that need to be
handled.
"""
for delta in deltas:
typ = delta["type"]
state_key = delta["state_key"]
room_id = delta["room_id"]
event_id = delta["event_id"]
prev_event_id = delta["prev_event_id"]
logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
if typ != EventTypes.Member:
continue
event = yield self.store.get_event(event_id)
if event.content.get("membership") != Membership.JOIN:
# We only care about joins
continue
if prev_event_id:
prev_event = yield self.store.get_event(prev_event_id)
if prev_event.content.get("membership") == Membership.JOIN:
# Ignore changes to join events.
continue
yield self._on_user_joined_room(room_id, state_key)
@defer.inlineCallbacks
def _on_user_joined_room(self, room_id, user_id):
"""Called when we detect a user joining the room via the current state
delta stream.
Args:
room_id (str)
user_id (str)
Returns:
Deferred
"""
if self.is_mine_id(user_id):
# If this is a local user then we need to send their presence
# out to hosts in the room (who don't already have it)
# TODO: We should be able to filter the hosts down to those that
# haven't previously seen the user
state = yield self.current_state_for_user(user_id)
hosts = yield self.state.get_current_hosts_in_room(room_id)
# Filter out ourselves.
hosts = set(host for host in hosts if host != self.server_name)
self.federation.send_presence_to_destinations(
states=[state],
destinations=hosts,
)
else:
# A remote user has joined the room, so we need to:
# 1. Check if this is a new server in the room
# 2. If so send any presence they don't already have for
# local users in the room.
# TODO: We should be able to filter the users down to those that
# the server hasn't previously seen
# TODO: Check that this is actually a new server joining the
# room.
user_ids = yield self.state.get_current_user_in_room(room_id)
user_ids = list(filter(self.is_mine_id, user_ids))
states = yield 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
# depending on what we want the UX to be, but at the least we
# should filter out offline presence where the state is just the
# default state.
now = self.clock.time_msec()
states = [
state for state in states.values()
if state.state != PresenceState.OFFLINE
or now - state.last_active_ts < 7 * 24 * 60 * 60 * 1000
or state.status_msg is not None
]
if states:
self.federation.send_presence_to_destinations(
states=states,
destinations=[get_domain_from_id(user_id)],
)
def should_notify(old_state, new_state):
"""Decides if a presence state change should be sent to interested parties.

176
tests/handlers/test_presence.py
View File

@ -16,7 +16,11 @@
from mock import Mock, call
from synapse.api.constants import PresenceState
from signedjson.key import generate_signing_key
from synapse.api.constants import EventTypes, Membership, PresenceState
from synapse.events import room_version_to_event_format
from synapse.events.builder import EventBuilder
from synapse.handlers.presence import (
FEDERATION_PING_INTERVAL,
FEDERATION_TIMEOUT,
@ -26,7 +30,9 @@ from synapse.handlers.presence import (
handle_timeout,
handle_update,
)
from synapse.rest.client.v1 import room
from synapse.storage.presence import UserPresenceState
from synapse.types import UserID, get_domain_from_id
from tests import unittest
@ -405,3 +411,171 @@ class PresenceTimeoutTestCase(unittest.TestCase):
self.assertIsNotNone(new_state)
self.assertEquals(state, new_state)
class PresenceJoinTestCase(unittest.HomeserverTestCase):
"""Tests remote servers get told about presence of users in the room when
they join and when new local users join.
"""
user_id = "@test:server"
servlets = [room.register_servlets]
def make_homeserver(self, reactor, clock):
hs = self.setup_test_homeserver(
"server", http_client=None,
federation_sender=Mock(),
)
return hs
def prepare(self, reactor, clock, hs):
self.federation_sender = hs.get_federation_sender()
self.event_builder_factory = hs.get_event_builder_factory()
self.federation_handler = hs.get_handlers().federation_handler
self.presence_handler = hs.get_presence_handler()
# self.event_builder_for_2 = EventBuilderFactory(hs)
# self.event_builder_for_2.hostname = "test2"
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.auth = hs.get_auth()
# We don't actually check signatures in tests, so lets just create a
# random key to use.
self.random_signing_key = generate_signing_key("ver")
def test_remote_joins(self):
# We advance time to something that isn't 0, as we use 0 as a special
# value.
self.reactor.advance(1000000000000)
# Create a room with two local users
room_id = self.helper.create_room_as(self.user_id)
self.helper.join(room_id, "@test2:server")
# Mark test2 as online, test will be offline with a last_active of 0
self.presence_handler.set_state(
UserID.from_string("@test2:server"), {"presence": PresenceState.ONLINE},
)
self.reactor.pump([0]) # Wait for presence updates to be handled
#
# Test that a new server gets told about existing presence
#
self.federation_sender.reset_mock()
# Add a new remote server to the room
self._add_new_user(room_id, "@alice:server2")
# We shouldn't have sent out any local presence *updates*
self.federation_sender.send_presence.assert_not_called()
# When new server is joined we send it the local users presence states.
# We expect to only see user @test2:server, as @test:server is offline
# and has a zero last_active_ts
expected_state = self.get_success(
self.presence_handler.current_state_for_user("@test2:server")
)
self.assertEqual(expected_state.state, PresenceState.ONLINE)
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations=["server2"], states=[expected_state]
)
#
# Test that only the new server gets sent presence and not existing servers
#
self.federation_sender.reset_mock()
self._add_new_user(room_id, "@bob:server3")
self.federation_sender.send_presence.assert_not_called()
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations=["server3"], states=[expected_state]
)
def test_remote_gets_presence_when_local_user_joins(self):
# We advance time to something that isn't 0, as we use 0 as a special
# value.
self.reactor.advance(1000000000000)
# Create a room with one local users
room_id = self.helper.create_room_as(self.user_id)
# Mark test as online
self.presence_handler.set_state(
UserID.from_string("@test:server"), {"presence": PresenceState.ONLINE},
)
# Mark test2 as online, test will be offline with a last_active of 0.
# Note we don't join them to the room yet
self.presence_handler.set_state(
UserID.from_string("@test2:server"), {"presence": PresenceState.ONLINE},
)
# Add servers to the room
self._add_new_user(room_id, "@alice:server2")
self._add_new_user(room_id, "@bob:server3")
self.reactor.pump([0]) # Wait for presence updates to be handled
#
# Test that when a local join happens remote servers get told about it
#
self.federation_sender.reset_mock()
# Join local user to room
self.helper.join(room_id, "@test2:server")
self.reactor.pump([0]) # Wait for presence updates to be handled
# We shouldn't have sent out any local presence *updates*
self.federation_sender.send_presence.assert_not_called()
# We expect to only send test2 presence to server2 and server3
expected_state = self.get_success(
self.presence_handler.current_state_for_user("@test2:server")
)
self.assertEqual(expected_state.state, PresenceState.ONLINE)
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations=set(("server2", "server3")),
states=[expected_state]
)
def _add_new_user(self, room_id, user_id):
"""Add new user to the room by creating an event and poking the federation API.
"""
hostname = get_domain_from_id(user_id)
room_version = self.get_success(self.store.get_room_version(room_id))
builder = EventBuilder(
state=self.state,
auth=self.auth,
store=self.store,
clock=self.clock,
hostname=hostname,
signing_key=self.random_signing_key,
format_version=room_version_to_event_format(room_version),
room_id=room_id,
type=EventTypes.Member,
sender=user_id,
state_key=user_id,
content={"membership": Membership.JOIN}
)
prev_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(room_id)
)
event = self.get_success(builder.build(prev_event_ids))
self.get_success(self.federation_handler.on_receive_pdu(hostname, event))
# Check that it was successfully persisted.
self.get_success(self.store.get_event(event.event_id))
self.get_success(self.store.get_event(event.event_id))