738 lines
29 KiB
Python
738 lines
29 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import datetime
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import logging
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from typing import TYPE_CHECKING, Dict, Hashable, Iterable, List, Optional, Tuple
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import attr
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from prometheus_client import Counter
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from synapse.api.errors import (
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FederationDeniedError,
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HttpResponseException,
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RequestSendFailed,
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)
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from synapse.api.presence import UserPresenceState
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from synapse.events import EventBase
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from synapse.federation.units import Edu
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from synapse.handlers.presence import format_user_presence_state
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from synapse.logging import issue9533_logger
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from synapse.logging.opentracing import SynapseTags, set_tag
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from synapse.metrics import sent_transactions_counter
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.types import ReadReceipt
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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if TYPE_CHECKING:
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import synapse.server
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# This is defined in the Matrix spec and enforced by the receiver.
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MAX_EDUS_PER_TRANSACTION = 100
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logger = logging.getLogger(__name__)
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sent_edus_counter = Counter(
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"synapse_federation_client_sent_edus", "Total number of EDUs successfully sent"
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)
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sent_edus_by_type = Counter(
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"synapse_federation_client_sent_edus_by_type",
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"Number of sent EDUs successfully sent, by event type",
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["type"],
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)
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class PerDestinationQueue:
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"""
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Manages the per-destination transmission queues.
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Args:
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hs
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transaction_sender
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destination: the server_name of the destination that we are managing
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transmission for.
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"""
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def __init__(
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self,
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hs: "synapse.server.HomeServer",
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transaction_manager: "synapse.federation.sender.TransactionManager",
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destination: str,
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):
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self._server_name = hs.hostname
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self._clock = hs.get_clock()
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self._store = hs.get_datastore()
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self._transaction_manager = transaction_manager
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self._instance_name = hs.get_instance_name()
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self._federation_shard_config = hs.config.worker.federation_shard_config
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self._state = hs.get_state_handler()
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self._should_send_on_this_instance = True
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if not self._federation_shard_config.should_handle(
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self._instance_name, destination
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):
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# We don't raise an exception here to avoid taking out any other
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# processing. We have a guard in `attempt_new_transaction` that
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# ensure we don't start sending stuff.
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logger.error(
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"Create a per destination queue for %s on wrong worker",
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destination,
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)
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self._should_send_on_this_instance = False
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self._destination = destination
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self.transmission_loop_running = False
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# Flag to signal to any running transmission loop that there is new data
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# queued up to be sent.
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self._new_data_to_send = False
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# True whilst we are sending events that the remote homeserver missed
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# because it was unreachable. We start in this state so we can perform
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# catch-up at startup.
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# New events will only be sent once this is finished, at which point
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# _catching_up is flipped to False.
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self._catching_up: bool = True
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# The stream_ordering of the most recent PDU that was discarded due to
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# being in catch-up mode.
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self._catchup_last_skipped: int = 0
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# Cache of the last successfully-transmitted stream ordering for this
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# destination (we are the only updater so this is safe)
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self._last_successful_stream_ordering: Optional[int] = None
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# a queue of pending PDUs
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self._pending_pdus: List[EventBase] = []
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# XXX this is never actually used: see
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# https://github.com/matrix-org/synapse/issues/7549
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self._pending_edus: List[Edu] = []
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# Pending EDUs by their "key". Keyed EDUs are EDUs that get clobbered
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# based on their key (e.g. typing events by room_id)
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# Map of (edu_type, key) -> Edu
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self._pending_edus_keyed: Dict[Tuple[str, Hashable], Edu] = {}
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# Map of user_id -> UserPresenceState of pending presence to be sent to this
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# destination
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self._pending_presence: Dict[str, UserPresenceState] = {}
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# room_id -> receipt_type -> user_id -> receipt_dict
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self._pending_rrs: Dict[str, Dict[str, Dict[str, dict]]] = {}
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self._rrs_pending_flush = False
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# stream_id of last successfully sent to-device message.
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# NB: may be a long or an int.
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self._last_device_stream_id = 0
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# stream_id of last successfully sent device list update.
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self._last_device_list_stream_id = 0
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def __str__(self) -> str:
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return "PerDestinationQueue[%s]" % self._destination
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def pending_pdu_count(self) -> int:
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return len(self._pending_pdus)
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def pending_edu_count(self) -> int:
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return (
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len(self._pending_edus)
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+ len(self._pending_presence)
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+ len(self._pending_edus_keyed)
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)
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def send_pdu(self, pdu: EventBase) -> None:
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"""Add a PDU to the queue, and start the transmission loop if necessary
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Args:
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pdu: pdu to send
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"""
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if not self._catching_up or self._last_successful_stream_ordering is None:
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# only enqueue the PDU if we are not catching up (False) or do not
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# yet know if we have anything to catch up (None)
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self._pending_pdus.append(pdu)
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else:
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assert pdu.internal_metadata.stream_ordering
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self._catchup_last_skipped = pdu.internal_metadata.stream_ordering
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self.attempt_new_transaction()
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def send_presence(
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self, states: Iterable[UserPresenceState], start_loop: bool = True
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) -> None:
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"""Add presence updates to the queue.
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Args:
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states: Presence updates to send
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start_loop: Whether to start the transmission loop if not already
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running.
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Args:
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states: presence to send
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"""
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self._pending_presence.update({state.user_id: state for state in states})
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self._new_data_to_send = True
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if start_loop:
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self.attempt_new_transaction()
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def queue_read_receipt(self, receipt: ReadReceipt) -> None:
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"""Add a RR to the list to be sent. Doesn't start the transmission loop yet
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(see flush_read_receipts_for_room)
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Args:
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receipt: receipt to be queued
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"""
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self._pending_rrs.setdefault(receipt.room_id, {}).setdefault(
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receipt.receipt_type, {}
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)[receipt.user_id] = {"event_ids": receipt.event_ids, "data": receipt.data}
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def flush_read_receipts_for_room(self, room_id: str) -> None:
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# if we don't have any read-receipts for this room, it may be that we've already
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# sent them out, so we don't need to flush.
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if room_id not in self._pending_rrs:
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return
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self._rrs_pending_flush = True
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self.attempt_new_transaction()
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def send_keyed_edu(self, edu: Edu, key: Hashable) -> None:
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self._pending_edus_keyed[(edu.edu_type, key)] = edu
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self.attempt_new_transaction()
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def send_edu(self, edu) -> None:
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self._pending_edus.append(edu)
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self.attempt_new_transaction()
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def attempt_new_transaction(self) -> None:
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"""Try to start a new transaction to this destination
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If there is already a transaction in progress to this destination,
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returns immediately. Otherwise kicks off the process of sending a
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transaction in the background.
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"""
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# Mark that we (may) have new things to send, so that any running
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# transmission loop will recheck whether there is stuff to send.
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self._new_data_to_send = True
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if self.transmission_loop_running:
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# XXX: this can get stuck on by a never-ending
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# request at which point pending_pdus just keeps growing.
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# we need application-layer timeouts of some flavour of these
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# requests
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logger.debug("TX [%s] Transaction already in progress", self._destination)
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return
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if not self._should_send_on_this_instance:
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# We don't raise an exception here to avoid taking out any other
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# processing.
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logger.error(
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"Trying to start a transaction to %s on wrong worker", self._destination
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)
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return
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logger.debug("TX [%s] Starting transaction loop", self._destination)
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run_as_background_process(
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"federation_transaction_transmission_loop",
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self._transaction_transmission_loop,
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)
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async def _transaction_transmission_loop(self) -> None:
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pending_pdus: List[EventBase] = []
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try:
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self.transmission_loop_running = True
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# This will throw if we wouldn't retry. We do this here so we fail
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# quickly, but we will later check this again in the http client,
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# hence why we throw the result away.
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await get_retry_limiter(self._destination, self._clock, self._store)
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if self._catching_up:
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# we potentially need to catch-up first
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await self._catch_up_transmission_loop()
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if self._catching_up:
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# not caught up yet
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return
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pending_pdus = []
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while True:
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self._new_data_to_send = False
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async with _TransactionQueueManager(self) as (
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pending_pdus,
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pending_edus,
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):
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if not pending_pdus and not pending_edus:
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logger.debug("TX [%s] Nothing to send", self._destination)
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# If we've gotten told about new things to send during
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# checking for things to send, we try looking again.
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# Otherwise new PDUs or EDUs might arrive in the meantime,
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# but not get sent because we hold the
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# `transmission_loop_running` flag.
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if self._new_data_to_send:
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continue
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else:
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return
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if pending_pdus:
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logger.debug(
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"TX [%s] len(pending_pdus_by_dest[dest]) = %d",
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self._destination,
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len(pending_pdus),
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)
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await self._transaction_manager.send_new_transaction(
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self._destination, pending_pdus, pending_edus
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)
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sent_transactions_counter.inc()
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sent_edus_counter.inc(len(pending_edus))
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for edu in pending_edus:
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sent_edus_by_type.labels(edu.edu_type).inc()
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except NotRetryingDestination as e:
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logger.debug(
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"TX [%s] not ready for retry yet (next retry at %s) - "
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"dropping transaction for now",
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self._destination,
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datetime.datetime.fromtimestamp(
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(e.retry_last_ts + e.retry_interval) / 1000.0
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),
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)
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if e.retry_interval > 60 * 60 * 1000:
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# we won't retry for another hour!
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# (this suggests a significant outage)
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# We drop pending EDUs because otherwise they will
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# rack up indefinitely.
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# (Dropping PDUs is already performed by `_start_catching_up`.)
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# Note that:
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# - the EDUs that are being dropped here are those that we can
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# afford to drop (specifically, only typing notifications,
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# read receipts and presence updates are being dropped here)
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# - Other EDUs such as to_device messages are queued with a
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# different mechanism
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# - this is all volatile state that would be lost if the
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# federation sender restarted anyway
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# dropping read receipts is a bit sad but should be solved
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# through another mechanism, because this is all volatile!
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self._pending_edus = []
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self._pending_edus_keyed = {}
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self._pending_presence = {}
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self._pending_rrs = {}
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self._start_catching_up()
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except FederationDeniedError as e:
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logger.info(e)
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except HttpResponseException as e:
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logger.warning(
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"TX [%s] Received %d response to transaction: %s",
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self._destination,
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e.code,
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e,
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)
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except RequestSendFailed as e:
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logger.warning(
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"TX [%s] Failed to send transaction: %s", self._destination, e
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)
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for p in pending_pdus:
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logger.info(
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"Failed to send event %s to %s", p.event_id, self._destination
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)
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except Exception:
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logger.exception("TX [%s] Failed to send transaction", self._destination)
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for p in pending_pdus:
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logger.info(
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"Failed to send event %s to %s", p.event_id, self._destination
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)
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finally:
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# We want to be *very* sure we clear this after we stop processing
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self.transmission_loop_running = False
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async def _catch_up_transmission_loop(self) -> None:
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first_catch_up_check = self._last_successful_stream_ordering is None
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if first_catch_up_check:
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# first catchup so get last_successful_stream_ordering from database
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self._last_successful_stream_ordering = (
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await self._store.get_destination_last_successful_stream_ordering(
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self._destination
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)
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)
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if self._last_successful_stream_ordering is None:
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# if it's still None, then this means we don't have the information
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# in our database we haven't successfully sent a PDU to this server
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# (at least since the introduction of the feature tracking
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# last_successful_stream_ordering).
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# Sadly, this means we can't do anything here as we don't know what
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# needs catching up — so catching up is futile; let's stop.
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self._catching_up = False
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return
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# get at most 50 catchup room/PDUs
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while True:
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event_ids = await self._store.get_catch_up_room_event_ids(
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self._destination,
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self._last_successful_stream_ordering,
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)
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if not event_ids:
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# No more events to catch up on, but we can't ignore the chance
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# of a race condition, so we check that no new events have been
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# skipped due to us being in catch-up mode
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if self._catchup_last_skipped > self._last_successful_stream_ordering:
|
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# another event has been skipped because we were in catch-up mode
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||
continue
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# we are done catching up!
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||
self._catching_up = False
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break
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|
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if first_catch_up_check:
|
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# as this is our check for needing catch-up, we may have PDUs in
|
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# the queue from before we *knew* we had to do catch-up, so
|
||
# clear those out now.
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||
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
|
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)
|
||
|
||
# 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
|
||
< self._last_successful_stream_ordering
|
||
):
|
||
continue
|
||
|
||
# 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).
|
||
hosts = await self._state.get_hosts_in_room_at_events(
|
||
p.room_id, [p.event_id]
|
||
)
|
||
if self._destination not in hosts:
|
||
continue
|
||
|
||
new_pdus.append(p)
|
||
|
||
# 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.
|
||
self._last_successful_stream_ordering = (
|
||
pdu.internal_metadata.stream_ordering
|
||
)
|
||
|
||
await self._store.set_destination_last_successful_stream_ordering(
|
||
self._destination, self._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="m.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="m.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)
|
||
class _TransactionQueueManager:
|
||
"""A helper async context manager for pulling stuff off the queues and
|
||
tracking what was last successfully sent, etc.
|
||
"""
|
||
|
||
queue = attr.ib(type=PerDestinationQueue)
|
||
|
||
_device_stream_id = attr.ib(type=Optional[int], default=None)
|
||
_device_list_id = attr.ib(type=Optional[int], default=None)
|
||
_last_stream_ordering = attr.ib(type=Optional[int], default=None)
|
||
_pdus = attr.ib(type=List[EventBase], 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.
|
||
limit = MAX_EDUS_PER_TRANSACTION - 2
|
||
|
||
device_update_edus, dev_list_id = await self.queue._get_device_update_edus(
|
||
limit
|
||
)
|
||
|
||
if device_update_edus:
|
||
self._device_list_id = dev_list_id
|
||
else:
|
||
self.queue._last_device_list_stream_id = dev_list_id
|
||
|
||
limit -= len(device_update_edus)
|
||
|
||
(
|
||
to_device_edus,
|
||
device_stream_id,
|
||
) = await self.queue._get_to_device_message_edus(limit)
|
||
|
||
if to_device_edus:
|
||
self._device_stream_id = device_stream_id
|
||
else:
|
||
self.queue._last_device_stream_id = device_stream_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="m.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, exc, tb):
|
||
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
|
||
)
|