mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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c66a06ac6b
This is in preparation for having multiple data stores that offer different functionality, e.g. splitting out state or event storage.
397 lines
15 KiB
Python
397 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# 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 prometheus_client import Counter
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from twisted.internet import defer
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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.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.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.storage.presence import UserPresenceState
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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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(object):
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"""
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Manages the per-destination transmission queues.
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Args:
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hs (synapse.HomeServer):
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transaction_sender (TransactionManager):
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destination (str): 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__(self, hs, transaction_manager, destination):
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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._destination = destination
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self.transmission_loop_running = False
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# a list of tuples of (pending pdu, order)
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self._pending_pdus = [] # type: list[tuple[EventBase, int]]
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self._pending_edus = [] # type: 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 = {} # type: dict[tuple[str, str], 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 = {} # type: dict[str, UserPresenceState]
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# room_id -> receipt_type -> user_id -> receipt_dict
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self._pending_rrs = {}
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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):
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return "PerDestinationQueue[%s]" % self._destination
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def pending_pdu_count(self):
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return len(self._pending_pdus)
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def pending_edu_count(self):
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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, order):
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"""Add a PDU to the queue, and start the transmission loop if neccessary
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Args:
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pdu (EventBase): pdu to send
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order (int):
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"""
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self._pending_pdus.append((pdu, order))
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self.attempt_new_transaction()
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def send_presence(self, states):
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"""Add presence updates to the queue. Start the transmission loop if neccessary.
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Args:
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states (iterable[UserPresenceState]): 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.attempt_new_transaction()
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def queue_read_receipt(self, receipt):
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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 (synapse.api.receipt_info.ReceiptInfo): 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):
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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, key):
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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):
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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):
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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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# list of (pending_pdu, deferred, order)
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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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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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@defer.inlineCallbacks
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def _transaction_transmission_loop(self):
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pending_pdus = []
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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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yield get_retry_limiter(self._destination, self._clock, self._store)
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pending_pdus = []
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while True:
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# We have to keep 2 free slots for presence and rr_edus
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limit = MAX_EDUS_PER_TRANSACTION - 2
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device_update_edus, dev_list_id = (
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yield self._get_device_update_edus(limit)
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)
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limit -= len(device_update_edus)
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to_device_edus, device_stream_id = (
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yield self._get_to_device_message_edus(limit)
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)
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pending_edus = device_update_edus + to_device_edus
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# BEGIN CRITICAL SECTION
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#
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# In order to avoid a race condition, we need to make sure that
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# the following code (from popping the queues up to the point
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# where we decide if we actually have any pending messages) is
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# atomic - otherwise new PDUs or EDUs might arrive in the
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# meantime, but not get sent because we hold the
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# transmission_loop_running flag.
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pending_pdus = self._pending_pdus
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# We can only include at most 50 PDUs per transactions
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pending_pdus, self._pending_pdus = pending_pdus[:50], pending_pdus[50:]
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pending_edus.extend(self._get_rr_edus(force_flush=False))
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pending_presence = self._pending_presence
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self._pending_presence = {}
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if pending_presence:
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pending_edus.append(
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Edu(
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origin=self._server_name,
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destination=self._destination,
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edu_type="m.presence",
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content={
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"push": [
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format_user_presence_state(
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presence, self._clock.time_msec()
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)
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for presence in pending_presence.values()
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]
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},
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)
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)
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pending_edus.extend(
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self._pop_pending_edus(MAX_EDUS_PER_TRANSACTION - len(pending_edus))
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)
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while (
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len(pending_edus) < MAX_EDUS_PER_TRANSACTION
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and self._pending_edus_keyed
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):
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_, val = self._pending_edus_keyed.popitem()
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pending_edus.append(val)
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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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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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self._last_device_stream_id = device_stream_id
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return
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# if we've decided to send a transaction anyway, and we have room, we
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# may as well send any pending RRs
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if len(pending_edus) < MAX_EDUS_PER_TRANSACTION:
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pending_edus.extend(self._get_rr_edus(force_flush=True))
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# END CRITICAL SECTION
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success = yield self._transaction_manager.send_new_transaction(
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self._destination, pending_pdus, pending_edus
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)
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if success:
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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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# Remove the acknowledged device messages from the database
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# Only bother if we actually sent some device messages
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if to_device_edus:
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yield self._store.delete_device_msgs_for_remote(
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self._destination, device_stream_id
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)
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# also mark the device updates as sent
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if device_update_edus:
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logger.info(
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"Marking as sent %r %r", self._destination, dev_list_id
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)
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yield self._store.mark_as_sent_devices_by_remote(
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self._destination, dev_list_id
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)
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self._last_device_stream_id = device_stream_id
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self._last_device_list_stream_id = dev_list_id
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else:
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break
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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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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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def _get_rr_edus(self, force_flush):
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if not self._pending_rrs:
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return
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if not force_flush and not self._rrs_pending_flush:
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# not yet time for this lot
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return
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edu = Edu(
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origin=self._server_name,
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destination=self._destination,
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edu_type="m.receipt",
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content=self._pending_rrs,
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)
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self._pending_rrs = {}
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self._rrs_pending_flush = False
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yield edu
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def _pop_pending_edus(self, limit):
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pending_edus = self._pending_edus
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pending_edus, self._pending_edus = pending_edus[:limit], pending_edus[limit:]
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return pending_edus
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@defer.inlineCallbacks
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def _get_device_update_edus(self, limit):
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last_device_list = self._last_device_list_stream_id
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# Retrieve list of new device updates to send to the destination
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now_stream_id, results = yield self._store.get_devices_by_remote(
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self._destination, last_device_list, limit=limit
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)
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edus = [
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Edu(
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origin=self._server_name,
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destination=self._destination,
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edu_type="m.device_list_update",
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content=content,
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)
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for content in results
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]
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assert len(edus) <= limit, "get_devices_by_remote returned too many EDUs"
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return (edus, now_stream_id)
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@defer.inlineCallbacks
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def _get_to_device_message_edus(self, limit):
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last_device_stream_id = self._last_device_stream_id
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to_device_stream_id = self._store.get_to_device_stream_token()
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contents, stream_id = yield self._store.get_new_device_msgs_for_remote(
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self._destination, last_device_stream_id, to_device_stream_id, limit
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)
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edus = [
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Edu(
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origin=self._server_name,
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destination=self._destination,
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edu_type="m.direct_to_device",
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content=content,
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)
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for content in contents
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]
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return (edus, stream_id)
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