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anonymousland-synapse/synapse/federation/sender/per_destination_queue.py
Erik Johnston 299b00d968
Prioritize outbound to-device over device list updates (#13922) 
Otherwise device list changes for large accounts can temporarily delay to-device messages.
2022-09-27 15:17:41 +01:00

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# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
# Copyright 2021 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 datetime
import logging
from types import TracebackType
from typing import TYPE_CHECKING, Dict, Hashable, Iterable, List, Optional, Tuple, Type
import attr
from prometheus_client import Counter
from synapse.api.constants import EduTypes
from synapse.api.errors import (
FederationDeniedError,
HttpResponseException,
RequestSendFailed,
)
from synapse.api.presence import UserPresenceState
from synapse.events import EventBase
from synapse.federation.units import Edu
from synapse.handlers.presence import format_user_presence_state
from synapse.logging import issue9533_logger
from synapse.logging.opentracing import SynapseTags, set_tag
from synapse.metrics import sent_transactions_counter
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import ReadReceipt
from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
from synapse.visibility import filter_events_for_server
if TYPE_CHECKING:
import synapse.server
# This is defined in the Matrix spec and enforced by the receiver.
MAX_EDUS_PER_TRANSACTION = 100
logger = logging.getLogger(__name__)
sent_edus_counter = Counter(
"synapse_federation_client_sent_edus", "Total number of EDUs successfully sent"
)
sent_edus_by_type = Counter(
"synapse_federation_client_sent_edus_by_type",
"Number of sent EDUs successfully sent, by event type",
["type"],
)
class PerDestinationQueue:
"""
Manages the per-destination transmission queues.
Args:
hs
transaction_sender
destination: the server_name of the destination that we are managing
transmission for.
"""
def __init__(
self,
hs: "synapse.server.HomeServer",
transaction_manager: "synapse.federation.sender.TransactionManager",
destination: str,
):
self._server_name = hs.hostname
self._clock = hs.get_clock()
self._storage_controllers = hs.get_storage_controllers()
self._store = hs.get_datastores().main
self._transaction_manager = transaction_manager
self._instance_name = hs.get_instance_name()
self._federation_shard_config = hs.config.worker.federation_shard_config
self._state = hs.get_state_handler()
self._should_send_on_this_instance = True
if not self._federation_shard_config.should_handle(
self._instance_name, destination
):
# We don't raise an exception here to avoid taking out any other
# processing. We have a guard in `attempt_new_transaction` that
# ensure we don't start sending stuff.
logger.error(
"Create a per destination queue for %s on wrong worker",
destination,
)
self._should_send_on_this_instance = False
self._destination = destination
self.transmission_loop_running = False
# Flag to signal to any running transmission loop that there is new data
# queued up to be sent.
self._new_data_to_send = False
# True whilst we are sending events that the remote homeserver missed
# because it was unreachable. We start in this state so we can perform
# catch-up at startup.
# New events will only be sent once this is finished, at which point
# _catching_up is flipped to False.
self._catching_up: bool = True
# The stream_ordering of the most recent PDU that was discarded due to
# being in catch-up mode.
self._catchup_last_skipped: int = 0
# Cache of the last successfully-transmitted stream ordering for this
# destination (we are the only updater so this is safe)
self._last_successful_stream_ordering: Optional[int] = None
# a queue of pending PDUs
self._pending_pdus: List[EventBase] = []
# XXX this is never actually used: see
# https://github.com/matrix-org/synapse/issues/7549
self._pending_edus: List[Edu] = []
# Pending EDUs by their "key". Keyed EDUs are EDUs that get clobbered
# based on their key (e.g. typing events by room_id)
# Map of (edu_type, key) -> Edu
self._pending_edus_keyed: Dict[Tuple[str, Hashable], Edu] = {}
# Map of user_id -> UserPresenceState of pending presence to be sent to this
# destination
self._pending_presence: Dict[str, UserPresenceState] = {}
# room_id -> receipt_type -> user_id -> receipt_dict
self._pending_rrs: Dict[str, Dict[str, Dict[str, dict]]] = {}
self._rrs_pending_flush = False
# stream_id of last successfully sent to-device message.
# NB: may be a long or an int.
self._last_device_stream_id = 0
# stream_id of last successfully sent device list update.
self._last_device_list_stream_id = 0
def __str__(self) -> str:
return "PerDestinationQueue[%s]" % self._destination
def pending_pdu_count(self) -> int:
return len(self._pending_pdus)
def pending_edu_count(self) -> int:
return (
len(self._pending_edus)
+ len(self._pending_presence)
+ len(self._pending_edus_keyed)
)
def send_pdu(self, pdu: EventBase) -> None:
"""Add a PDU to the queue, and start the transmission loop if necessary
Args:
pdu: pdu to send
"""
if not self._catching_up or self._last_successful_stream_ordering is None:
# only enqueue the PDU if we are not catching up (False) or do not
# yet know if we have anything to catch up (None)
self._pending_pdus.append(pdu)
else:
assert pdu.internal_metadata.stream_ordering
self._catchup_last_skipped = pdu.internal_metadata.stream_ordering
self.attempt_new_transaction()
def send_presence(
self, states: Iterable[UserPresenceState], start_loop: bool = True
) -> None:
"""Add presence updates to the queue.
Args:
states: Presence updates to send
start_loop: Whether to start the transmission loop if not already
running.
Args:
states: presence to send
"""
self._pending_presence.update({state.user_id: state for state in states})
self._new_data_to_send = True
if start_loop:
self.attempt_new_transaction()
def queue_read_receipt(self, receipt: ReadReceipt) -> None:
"""Add a RR to the list to be sent. Doesn't start the transmission loop yet
(see flush_read_receipts_for_room)
Args:
receipt: receipt to be queued
"""
self._pending_rrs.setdefault(receipt.room_id, {}).setdefault(
receipt.receipt_type, {}
)[receipt.user_id] = {"event_ids": receipt.event_ids, "data": receipt.data}
def flush_read_receipts_for_room(self, room_id: str) -> None:
# if we don't have any read-receipts for this room, it may be that we've already
# sent them out, so we don't need to flush.
if room_id not in self._pending_rrs:
return
self._rrs_pending_flush = True
self.attempt_new_transaction()
def send_keyed_edu(self, edu: Edu, key: Hashable) -> None:
self._pending_edus_keyed[(edu.edu_type, key)] = edu
self.attempt_new_transaction()
def send_edu(self, edu: Edu) -> None:
self._pending_edus.append(edu)
self.attempt_new_transaction()
def mark_new_data(self) -> None:
"""Marks that the destination has new data to send, without starting a
new transaction.
If a transaction loop is already in progress then a new transaction will
be attempted when the current one finishes.
"""
self._new_data_to_send = True
def attempt_new_transaction(self) -> None:
"""Try to start a new transaction to this destination
If there is already a transaction in progress to this destination,
returns immediately. Otherwise kicks off the process of sending a
transaction in the background.
"""
# Mark that we (may) have new things to send, so that any running
# transmission loop will recheck whether there is stuff to send.
self._new_data_to_send = True
if self.transmission_loop_running:
# XXX: this can get stuck on by a never-ending
# request at which point pending_pdus just keeps growing.
# we need application-layer timeouts of some flavour of these
# requests
logger.debug("TX [%s] Transaction already in progress", self._destination)
return
if not self._should_send_on_this_instance:
# We don't raise an exception here to avoid taking out any other
# processing.
logger.error(
"Trying to start a transaction to %s on wrong worker", self._destination
)
return
logger.debug("TX [%s] Starting transaction loop", self._destination)
run_as_background_process(
"federation_transaction_transmission_loop",
self._transaction_transmission_loop,
)
async def _transaction_transmission_loop(self) -> None:
pending_pdus: List[EventBase] = []
try:
self.transmission_loop_running = True
# This will throw if we wouldn't retry. We do this here so we fail
# quickly, but we will later check this again in the http client,
# hence why we throw the result away.
await get_retry_limiter(self._destination, self._clock, self._store)
if self._catching_up:
# we potentially need to catch-up first
await self._catch_up_transmission_loop()
if self._catching_up:
# not caught up yet
return
pending_pdus = []
while True:
self._new_data_to_send = False
async with _TransactionQueueManager(self) as (
pending_pdus,
pending_edus,
):
if not pending_pdus and not pending_edus:
logger.debug("TX [%s] Nothing to send", self._destination)
# If we've gotten told about new things to send during
# checking for things to send, we try looking again.
# Otherwise new PDUs or EDUs might arrive in the meantime,
# but not get sent because we hold the
# `transmission_loop_running` flag.
if self._new_data_to_send:
continue
else:
return
if pending_pdus:
logger.debug(
"TX [%s] len(pending_pdus_by_dest[dest]) = %d",
self._destination,
len(pending_pdus),
)
await self._transaction_manager.send_new_transaction(
self._destination, pending_pdus, pending_edus
)
sent_transactions_counter.inc()
sent_edus_counter.inc(len(pending_edus))
for edu in pending_edus:
sent_edus_by_type.labels(edu.edu_type).inc()
except NotRetryingDestination as e:
logger.debug(
"TX [%s] not ready for retry yet (next retry at %s) - "
"dropping transaction for now",
self._destination,
datetime.datetime.fromtimestamp(
(e.retry_last_ts + e.retry_interval) / 1000.0
),
)
if e.retry_interval > 60 * 60 * 1000:
# we won't retry for another hour!
# (this suggests a significant outage)
# We drop pending EDUs because otherwise they will
# rack up indefinitely.
# (Dropping PDUs is already performed by `_start_catching_up`.)
# Note that:
# - the EDUs that are being dropped here are those that we can
# afford to drop (specifically, only typing notifications,
# read receipts and presence updates are being dropped here)
# - Other EDUs such as to_device messages are queued with a
# different mechanism
# - this is all volatile state that would be lost if the
# federation sender restarted anyway
# dropping read receipts is a bit sad but should be solved
# through another mechanism, because this is all volatile!
self._pending_edus = []
self._pending_edus_keyed = {}
self._pending_presence = {}
self._pending_rrs = {}
self._start_catching_up()
except FederationDeniedError as e:
logger.info(e)
except HttpResponseException as e:
logger.warning(
"TX [%s] Received %d response to transaction: %s",
self._destination,
e.code,
e,
)
except RequestSendFailed as e:
logger.warning(
"TX [%s] Failed to send transaction: %s", self._destination, e
)
for p in pending_pdus:
logger.info(
"Failed to send event %s to %s", p.event_id, self._destination
)
except Exception:
logger.exception("TX [%s] Failed to send transaction", self._destination)
for p in pending_pdus:
logger.info(
"Failed to send event %s to %s", p.event_id, self._destination
)
finally:
# We want to be *very* sure we clear this after we stop processing
self.transmission_loop_running = False
async def _catch_up_transmission_loop(self) -> None:
first_catch_up_check = self._last_successful_stream_ordering is None
if first_catch_up_check:
# first catchup so get last_successful_stream_ordering from database
self._last_successful_stream_ordering = (
await self._store.get_destination_last_successful_stream_ordering(
self._destination
)
)
_tmp_last_successful_stream_ordering = self._last_successful_stream_ordering
if _tmp_last_successful_stream_ordering is None:
# if it's still None, then this means we don't have the information
# in our database ­ we haven't successfully sent a PDU to this server
# (at least since the introduction of the feature tracking
# last_successful_stream_ordering).
# Sadly, this means we can't do anything here as we don't know what
# needs catching up — so catching up is futile; let's stop.
self._catching_up = False
return
last_successful_stream_ordering: int = _tmp_last_successful_stream_ordering
# get at most 50 catchup room/PDUs
while True:
event_ids = await self._store.get_catch_up_room_event_ids(
self._destination, last_successful_stream_ordering
)
if not event_ids:
# No more events to catch up on, but we can't ignore the chance
# of a race condition, so we check that no new events have been
# skipped due to us being in catch-up mode
if self._catchup_last_skipped > last_successful_stream_ordering:
# another event has been skipped because we were in catch-up mode
continue
# we are done catching up!
self._catching_up = False
break
if first_catch_up_check:
# as this is our check for needing catch-up, we may have PDUs in
# the queue from before we *knew* we had to do catch-up, so
# clear those out now.
self._start_catching_up()
# fetch the relevant events from the event store
# - redacted behaviour of REDACT is fine, since we only send metadata
# of redacted events to the destination.
# - don't need to worry about rejected events as we do not actively
# forward received events over federation.
catchup_pdus = await self._store.get_events_as_list(event_ids)
if not catchup_pdus:
raise AssertionError(
"No events retrieved when we asked for %r. "
"This should not happen." % event_ids
)
logger.info(
"Catching up destination %s with %d PDUs",
self._destination,
len(catchup_pdus),
)
# We send transactions with events from one room only, as its likely
# that the remote will have to do additional processing, which may
# take some time. It's better to give it small amounts of work
# rather than risk the request timing out and repeatedly being
# retried, and not making any progress.
#
# Note: `catchup_pdus` will have exactly one PDU per room.
for pdu in catchup_pdus:
# The PDU from the DB will be the last PDU in the room from
# *this server* that wasn't sent to the remote. However, other
# servers may have sent lots of events since then, and we want
# to try and tell the remote only about the *latest* events in
# the room. This is so that it doesn't get inundated by events
# from various parts of the DAG, which all need to be processed.
#
# Note: this does mean that in large rooms a server coming back
# online will get sent the same events from all the different
# servers, but the remote will correctly deduplicate them and
# handle it only once.
# Step 1, fetch the current extremities
extrems = await self._store.get_prev_events_for_room(pdu.room_id)
if pdu.event_id in extrems:
# If the event is in the extremities, then great! We can just
# use that without having to do further checks.
room_catchup_pdus = [pdu]
else:
# If not, fetch the extremities and figure out which we can
# send.
extrem_events = await self._store.get_events_as_list(extrems)
new_pdus = []
for p in extrem_events:
# We pulled this from the DB, so it'll be non-null
assert p.internal_metadata.stream_ordering
# Filter out events that happened before the remote went
# offline
if (
p.internal_metadata.stream_ordering
< last_successful_stream_ordering
):
continue
new_pdus.append(p)
# Filter out events where the server is not in the room,
# e.g. it may have left/been kicked. *Ideally* we'd pull
# out the kick and send that, but it's a rare edge case
# so we don't bother for now (the server that sent the
# kick should send it out if its online).
new_pdus = await filter_events_for_server(
self._storage_controllers,
self._destination,
new_pdus,
redact=False,
)
# If we've filtered out all the extremities, fall back to
# sending the original event. This should ensure that the
# server gets at least some of missed events (especially if
# the other sending servers are up).
if new_pdus:
room_catchup_pdus = new_pdus
else:
room_catchup_pdus = [pdu]
logger.info(
"Catching up rooms to %s: %r", self._destination, pdu.room_id
)
await self._transaction_manager.send_new_transaction(
self._destination, room_catchup_pdus, []
)
sent_transactions_counter.inc()
# We pulled this from the DB, so it'll be non-null
assert pdu.internal_metadata.stream_ordering
# Note that we mark the last successful stream ordering as that
# from the *original* PDU, rather than the PDU(s) we actually
# send. This is because we use it to mark our position in the
# queue of missed PDUs to process.
last_successful_stream_ordering = pdu.internal_metadata.stream_ordering
self._last_successful_stream_ordering = last_successful_stream_ordering
await self._store.set_destination_last_successful_stream_ordering(
self._destination, last_successful_stream_ordering
)
def _get_rr_edus(self, force_flush: bool) -> Iterable[Edu]:
if not self._pending_rrs:
return
if not force_flush and not self._rrs_pending_flush:
# not yet time for this lot
return
edu = Edu(
origin=self._server_name,
destination=self._destination,
edu_type=EduTypes.RECEIPT,
content=self._pending_rrs,
)
self._pending_rrs = {}
self._rrs_pending_flush = False
yield edu
def _pop_pending_edus(self, limit: int) -> List[Edu]:
pending_edus = self._pending_edus
pending_edus, self._pending_edus = pending_edus[:limit], pending_edus[limit:]
return pending_edus
async def _get_device_update_edus(self, limit: int) -> Tuple[List[Edu], int]:
last_device_list = self._last_device_list_stream_id
# Retrieve list of new device updates to send to the destination
now_stream_id, results = await self._store.get_device_updates_by_remote(
self._destination, last_device_list, limit=limit
)
edus = [
Edu(
origin=self._server_name,
destination=self._destination,
edu_type=edu_type,
content=content,
)
for (edu_type, content) in results
]
assert len(edus) <= limit, "get_device_updates_by_remote returned too many EDUs"
return edus, now_stream_id
async def _get_to_device_message_edus(self, limit: int) -> Tuple[List[Edu], int]:
last_device_stream_id = self._last_device_stream_id
to_device_stream_id = self._store.get_to_device_stream_token()
contents, stream_id = await self._store.get_new_device_msgs_for_remote(
self._destination, last_device_stream_id, to_device_stream_id, limit
)
for content in contents:
message_id = content.get("message_id")
if not message_id:
continue
set_tag(SynapseTags.TO_DEVICE_MESSAGE_ID, message_id)
edus = [
Edu(
origin=self._server_name,
destination=self._destination,
edu_type=EduTypes.DIRECT_TO_DEVICE,
content=content,
)
for content in contents
]
if edus:
issue9533_logger.debug(
"Sending %i to-device messages to %s, up to stream id %i",
len(edus),
self._destination,
stream_id,
)
return edus, stream_id
def _start_catching_up(self) -> None:
"""
Marks this destination as being in catch-up mode.
This throws away the PDU queue.
"""
self._catching_up = True
self._pending_pdus = []
@attr.s(slots=True, auto_attribs=True)
class _TransactionQueueManager:
"""A helper async context manager for pulling stuff off the queues and
tracking what was last successfully sent, etc.
"""
queue: PerDestinationQueue
_device_stream_id: Optional[int] = None
_device_list_id: Optional[int] = None
_last_stream_ordering: Optional[int] = None
_pdus: List[EventBase] = attr.Factory(list)
async def __aenter__(self) -> Tuple[List[EventBase], List[Edu]]:
# First we calculate the EDUs we want to send, if any.
# We start by fetching device related EDUs, i.e device updates and to
# device messages. We have to keep 2 free slots for presence and rr_edus.
device_edu_limit = MAX_EDUS_PER_TRANSACTION - 2
# We prioritize to-device messages so that existing encryption channels
# work. We also keep a few slots spare (by reducing the limit) so that
# we can still trickle out some device list updates.
(
to_device_edus,
device_stream_id,
) = await self.queue._get_to_device_message_edus(device_edu_limit - 10)
if to_device_edus:
self._device_stream_id = device_stream_id
else:
self.queue._last_device_stream_id = device_stream_id
device_edu_limit -= len(to_device_edus)
device_update_edus, dev_list_id = await self.queue._get_device_update_edus(
device_edu_limit
)
if device_update_edus:
self._device_list_id = dev_list_id
else:
self.queue._last_device_list_stream_id = dev_list_id
pending_edus = device_update_edus + to_device_edus
# Now add the read receipt EDU.
pending_edus.extend(self.queue._get_rr_edus(force_flush=False))
# And presence EDU.
if self.queue._pending_presence:
pending_edus.append(
Edu(
origin=self.queue._server_name,
destination=self.queue._destination,
edu_type=EduTypes.PRESENCE,
content={
"push": [
format_user_presence_state(
presence, self.queue._clock.time_msec()
)
for presence in self.queue._pending_presence.values()
]
},
)
)
self.queue._pending_presence = {}
# Finally add any other types of EDUs if there is room.
pending_edus.extend(
self.queue._pop_pending_edus(MAX_EDUS_PER_TRANSACTION - len(pending_edus))
)
while (
len(pending_edus) < MAX_EDUS_PER_TRANSACTION
and self.queue._pending_edus_keyed
):
_, val = self.queue._pending_edus_keyed.popitem()
pending_edus.append(val)
# Now we look for any PDUs to send, by getting up to 50 PDUs from the
# queue
self._pdus = self.queue._pending_pdus[:50]
if not self._pdus and not pending_edus:
return [], []
# if we've decided to send a transaction anyway, and we have room, we
# may as well send any pending RRs
if len(pending_edus) < MAX_EDUS_PER_TRANSACTION:
pending_edus.extend(self.queue._get_rr_edus(force_flush=True))
if self._pdus:
self._last_stream_ordering = self._pdus[
-1
].internal_metadata.stream_ordering
assert self._last_stream_ordering
return self._pdus, pending_edus
async def __aexit__(
self,
exc_type: Optional[Type[BaseException]],
exc: Optional[BaseException],
tb: Optional[TracebackType],
) -> None:
if exc_type is not None:
# Failed to send transaction, so we bail out.
return
# Successfully sent transactions, so we remove pending PDUs from the queue
if self._pdus:
self.queue._pending_pdus = self.queue._pending_pdus[len(self._pdus) :]
# Succeeded to send the transaction so we record where we have sent up
# to in the various streams
if self._device_stream_id:
await self.queue._store.delete_device_msgs_for_remote(
self.queue._destination, self._device_stream_id
)
self.queue._last_device_stream_id = self._device_stream_id
# also mark the device updates as sent
if self._device_list_id:
logger.info(
"Marking as sent %r %r", self.queue._destination, self._device_list_id
)
await self.queue._store.mark_as_sent_devices_by_remote(
self.queue._destination, self._device_list_id
)
self.queue._last_device_list_stream_id = self._device_list_id
if self._last_stream_ordering:
# we sent some PDUs and it was successful, so update our
# last_successful_stream_ordering in the destinations table.
await self.queue._store.set_destination_last_successful_stream_ordering(
self.queue._destination, self._last_stream_ordering
)
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