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Don't send normal presence updates over federation replication stream (#9828)

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Erik Johnston 2021-04-19 10:50:49 +01:00 committed by GitHub
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commit 2b7dd21655
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5 changed files with 75 additions and 183 deletions
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1
changelog.d/9828.feature Normal file
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@ -0,0 +1 @@
Add experimental support for handling presence on a worker.

70
synapse/federation/send_queue.py
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@ -76,9 +76,6 @@ class FederationRemoteSendQueue(AbstractFederationSender):
# Pending presence map user_id -> UserPresenceState
self.presence_map = {} # type: Dict[str, UserPresenceState]
# Stream position -> list[user_id]
self.presence_changed = SortedDict() # type: SortedDict[int, List[str]]
# Stores the destinations we need to explicitly send presence to about a
# given user.
# Stream position -> (user_id, destinations)
@ -96,7 +93,7 @@ class FederationRemoteSendQueue(AbstractFederationSender):
self.edus = SortedDict() # type: SortedDict[int, Edu]
# stream ID for the next entry into presence_changed/keyed_edu_changed/edus.
# stream ID for the next entry into keyed_edu_changed/edus.
self.pos = 1
# map from stream ID to the time that stream entry was generated, so that we
@ -117,7 +114,6 @@ class FederationRemoteSendQueue(AbstractFederationSender):
for queue_name in [
"presence_map",
"presence_changed",
"keyed_edu",
"keyed_edu_changed",
"edus",
@ -155,23 +151,12 @@ class FederationRemoteSendQueue(AbstractFederationSender):
"""Clear all the queues from before a given position"""
with Measure(self.clock, "send_queue._clear"):
# Delete things out of presence maps
keys = self.presence_changed.keys()
i = self.presence_changed.bisect_left(position_to_delete)
for key in keys[:i]:
del self.presence_changed[key]
user_ids = {
user_id for uids in self.presence_changed.values() 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()
)
user_ids = {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
@ -244,23 +229,6 @@ class FederationRemoteSendQueue(AbstractFederationSender):
"""
# nothing to do here: the replication listener will handle it.
def send_presence(self, states: List[UserPresenceState]) -> None:
"""As per FederationSender
Args:
states
"""
pos = self._next_pos()
# We only want to send presence for our own users, so lets always just
# filter here just in case.
local_states = [s for s in states if self.is_mine_id(s.user_id)]
self.presence_map.update({state.user_id: state for state in local_states})
self.presence_changed[pos] = [state.user_id for state in local_states]
self.notifier.on_new_replication_data()
def send_presence_to_destinations(
self, states: Iterable[UserPresenceState], destinations: Iterable[str]
) -> None:
@ -325,18 +293,6 @@ class FederationRemoteSendQueue(AbstractFederationSender):
# of the federation stream.
rows = [] # type: List[Tuple[int, BaseFederationRow]]
# Fetch changed presence
i = self.presence_changed.bisect_right(from_token)
j = self.presence_changed.bisect_right(to_token) + 1
dest_user_ids = [
(pos, user_id)
for pos, user_id_list in self.presence_changed.items()[i:j]
for user_id in user_id_list
]
for (key, user_id) in dest_user_ids:
rows.append((key, PresenceRow(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
@ -427,22 +383,6 @@ class BaseFederationRow:
raise NotImplementedError()
class PresenceRow(
BaseFederationRow, namedtuple("PresenceRow", ("state",)) # UserPresenceState
):
TypeId = "p"
@staticmethod
def from_data(data):
return PresenceRow(state=UserPresenceState.from_dict(data))
def to_data(self):
return self.state.as_dict()
def add_to_buffer(self, buff):
buff.presence.append(self.state)
class PresenceDestinationsRow(
BaseFederationRow,
namedtuple(
@ -506,7 +446,6 @@ class EduRow(BaseFederationRow, namedtuple("EduRow", ("edu",))): # Edu
_rowtypes = (
PresenceRow,
PresenceDestinationsRow,
KeyedEduRow,
EduRow,
@ -518,7 +457,6 @@ TypeToRow = {Row.TypeId: Row for Row in _rowtypes}
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]
@ -543,7 +481,6 @@ def process_rows_for_federation(
# them into the appropriate collection and then send them off.
buff = ParsedFederationStreamData(
presence=[],
presence_destinations=[],
keyed_edus={},
edus={},
@ -559,9 +496,6 @@ def process_rows_for_federation(
parsed_row = RowType.from_data(row.data)
parsed_row.add_to_buffer(buff)
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

96
synapse/federation/sender/__init__.py
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@ -24,8 +24,6 @@ from synapse.events import EventBase
from synapse.federation.sender.per_destination_queue import PerDestinationQueue
from synapse.federation.sender.transaction_manager import TransactionManager
from synapse.federation.units import Edu
from synapse.handlers.presence import get_interested_remotes
from synapse.logging.context import preserve_fn
from synapse.metrics import (
LaterGauge,
event_processing_loop_counter,
@ -34,7 +32,7 @@ from synapse.metrics import (
)
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import Collection, JsonDict, ReadReceipt, RoomStreamToken
from synapse.util.metrics import Measure, measure_func
from synapse.util.metrics import Measure
if TYPE_CHECKING:
from synapse.events.presence_router import PresenceRouter
@ -79,15 +77,6 @@ class AbstractFederationSender(metaclass=abc.ABCMeta):
"""
raise NotImplementedError()
@abc.abstractmethod
def send_presence(self, states: List[UserPresenceState]) -> None:
"""Send the new presence states to the appropriate destinations.
This actually queues up the presence states ready for sending and
triggers a background task to process them and send out the transactions.
"""
raise NotImplementedError()
@abc.abstractmethod
def send_presence_to_destinations(
self, states: Iterable[UserPresenceState], destinations: Iterable[str]
@ -176,11 +165,6 @@ class FederationSender(AbstractFederationSender):
),
)
# Map of user_id -> UserPresenceState for all the pending presence
# to be sent out by user_id. Entries here get processed and put in
# pending_presence_by_dest
self.pending_presence = {} # type: Dict[str, UserPresenceState]
LaterGauge(
"synapse_federation_transaction_queue_pending_pdus",
"",
@ -201,8 +185,6 @@ class FederationSender(AbstractFederationSender):
self._is_processing = False
self._last_poked_id = -1
self._processing_pending_presence = False
# map from room_id to a set of PerDestinationQueues which we believe are
# awaiting a call to flush_read_receipts_for_room. The presence of an entry
# here for a given room means that we are rate-limiting RR flushes to that room,
@ -546,48 +528,6 @@ class FederationSender(AbstractFederationSender):
for queue in queues:
queue.flush_read_receipts_for_room(room_id)
@preserve_fn # the caller should not yield on this
async def send_presence(self, states: List[UserPresenceState]) -> None:
"""Send the new presence states to the appropriate destinations.
This actually queues up the presence states ready for sending and
triggers a background task to process them and send out the transactions.
"""
if not self.hs.config.use_presence:
# No-op if presence is disabled.
return
# First we queue up the new presence by user ID, so multiple presence
# 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(
{state.user_id: state for state in states if self.is_mine_id(state.user_id)}
)
# We then handle the new pending presence in batches, first figuring
# out the destinations we need to send each state to and then poking it
# to attempt a new transaction. We linearize this so that we don't
# accidentally mess up the ordering and send multiple presence updates
# in the wrong order
if self._processing_pending_presence:
return
self._processing_pending_presence = True
try:
while True:
states_map = self.pending_presence
self.pending_presence = {}
if not states_map:
break
await self._process_presence_inner(list(states_map.values()))
except Exception:
logger.exception("Error sending presence states to servers")
finally:
self._processing_pending_presence = False
def send_presence_to_destinations(
self, states: Iterable[UserPresenceState], destinations: Iterable[str]
) -> None:
@ -608,40 +548,6 @@ class FederationSender(AbstractFederationSender):
continue
self._get_per_destination_queue(destination).send_presence(states)
@measure_func("txnqueue._process_presence")
async def _process_presence_inner(self, states: List[UserPresenceState]) -> None:
"""Given a list of states populate self.pending_presence_by_dest and
poke to send a new transaction to each destination
"""
# We pull the presence router here instead of __init__
# to prevent a dependency cycle:
#
# AuthHandler -> Notifier -> FederationSender
# -> PresenceRouter -> ModuleApi -> AuthHandler
if self._presence_router is None:
self._presence_router = self.hs.get_presence_router()
assert self._presence_router is not None
hosts_and_states = await get_interested_remotes(
self.store,
self._presence_router,
states,
self.state,
)
for destinations, states in hosts_and_states:
for destination in destinations:
if destination == self.server_name:
continue
if not self._federation_shard_config.should_handle(
self._instance_name, destination
):
continue
self._get_per_destination_queue(destination).send_presence(states)
def build_and_send_edu(
self,
destination: str,

78
synapse/handlers/presence.py
View File

@ -123,6 +123,14 @@ class BasePresenceHandler(abc.ABC):
def __init__(self, hs: "HomeServer"):
self.clock = hs.get_clock()
self.store = hs.get_datastore()
self.presence_router = hs.get_presence_router()
self.state = hs.get_state_handler()
self._federation = None
if hs.should_send_federation() or not hs.config.worker_app:
self._federation = hs.get_federation_sender()
self._send_federation = hs.should_send_federation()
self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
@ -249,6 +257,29 @@ class BasePresenceHandler(abc.ABC):
"""Process presence stream rows received over replication."""
pass
async def maybe_send_presence_to_interested_destinations(
self, states: List[UserPresenceState]
):
"""If this instance is a federation sender, send the states to all
destinations that are interested.
"""
if not self._send_federation:
return
# If this worker sends federation we must have a FederationSender.
assert self._federation
hosts_and_states = await get_interested_remotes(
self.store,
self.presence_router,
states,
self.state,
)
for destinations, states in hosts_and_states:
self._federation.send_presence_to_destinations(states, destinations)
class _NullContextManager(ContextManager[None]):
"""A context manager which does nothing."""
@ -263,7 +294,6 @@ class WorkerPresenceHandler(BasePresenceHandler):
self.hs = hs
self.is_mine_id = hs.is_mine_id
self.presence_router = hs.get_presence_router()
self._presence_enabled = hs.config.use_presence
# The number of ongoing syncs on this process, by user id.
@ -388,6 +418,9 @@ class WorkerPresenceHandler(BasePresenceHandler):
users=users_to_states.keys(),
)
# If this is a federation sender, notify about presence updates.
await self.maybe_send_presence_to_interested_destinations(states)
async def process_replication_rows(self, token, rows):
states = [
UserPresenceState(
@ -463,9 +496,6 @@ class PresenceHandler(BasePresenceHandler):
self.server_name = hs.hostname
self.wheel_timer = WheelTimer()
self.notifier = hs.get_notifier()
self.federation = hs.get_federation_sender()
self.state = hs.get_state_handler()
self.presence_router = hs.get_presence_router()
self._presence_enabled = hs.config.use_presence
federation_registry = hs.get_federation_registry()
@ -672,6 +702,13 @@ class PresenceHandler(BasePresenceHandler):
self.unpersisted_users_changes |= {s.user_id for s in new_states}
self.unpersisted_users_changes -= set(to_notify.keys())
# Check if we need to resend any presence states to remote hosts. We
# only do this for states that haven't been updated in a while to
# ensure that the remote host doesn't time the presence state out.
#
# Note that since these are states that have *not* been updated,
# they won't get sent down the normal presence replication stream,
# and so we have to explicitly send them via the federation stream.
to_federation_ping = {
user_id: state
for user_id, state in to_federation_ping.items()
@ -680,7 +717,19 @@ class PresenceHandler(BasePresenceHandler):
if to_federation_ping:
federation_presence_out_counter.inc(len(to_federation_ping))
self._push_to_remotes(to_federation_ping.values())
hosts_and_states = await get_interested_remotes(
self.store,
self.presence_router,
list(to_federation_ping.values()),
self.state,
)
# Since this is master we know that we have a federation sender or
# queue, and so this will be defined.
assert self._federation
for destinations, states in hosts_and_states:
self._federation.send_presence_to_destinations(states, destinations)
async def _handle_timeouts(self):
"""Checks the presence of users that have timed out and updates as
@ -920,15 +969,10 @@ class PresenceHandler(BasePresenceHandler):
users=[UserID.from_string(u) for u in users_to_states],
)
self._push_to_remotes(states)
def _push_to_remotes(self, states):
"""Sends state updates to remote servers.
Args:
states (list(UserPresenceState))
"""
self.federation.send_presence(states)
# We only want to poke the local federation sender, if any, as other
# workers will receive the presence updates via the presence replication
# stream (which is updated by `store.update_presence`).
await self.maybe_send_presence_to_interested_destinations(states)
async def incoming_presence(self, origin, content):
"""Called when we receive a `m.presence` EDU from a remote server."""
@ -1164,9 +1208,13 @@ class PresenceHandler(BasePresenceHandler):
user_presence_states
)
# Since this is master we know that we have a federation sender or
# queue, and so this will be defined.
assert self._federation
# Send out user presence updates for each destination
for destination, user_state_set in presence_destinations.items():
self.federation.send_presence_to_destinations(
self._federation.send_presence_to_destinations(
destinations=[destination], states=user_state_set
)

13
synapse/module_api/__init__.py
View File

@ -50,6 +50,7 @@ class ModuleApi:
self._auth_handler = auth_handler
self._server_name = hs.hostname
self._presence_stream = hs.get_event_sources().sources["presence"]
self._state = hs.get_state_handler()
# We expose these as properties below in order to attach a helpful docstring.
self._http_client = hs.get_simple_http_client() # type: SimpleHttpClient
@ -429,11 +430,13 @@ class ModuleApi:
UserID.from_string(user), from_key=None, include_offline=False
)
# Send to remote destinations
await make_deferred_yieldable(
# We pull the federation sender here as we can only do so on workers
# that support sending presence
self._hs.get_federation_sender().send_presence(presence_events)
# Send to remote destinations.
# We pull out the presence handler here to break a cyclic
# dependency between the presence router and module API.
presence_handler = self._hs.get_presence_handler()
await presence_handler.maybe_send_presence_to_interested_destinations(
presence_events
)