319 lines
12 KiB
Python
319 lines
12 KiB
Python
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# -*- 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 import UserPresenceState
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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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",
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"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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# 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 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({
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state.user_id: state for state in states
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})
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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(
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"TX [%s] Transaction already in progress",
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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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@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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device_message_edus, device_stream_id, dev_list_id = (
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yield self._get_new_device_messages()
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)
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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 = self._pending_edus
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# We can only include at most 100 EDUs per transactions
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pending_edus, self._pending_edus = pending_edus[:100], pending_edus[100:]
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pending_edus.extend(
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self._pending_edus_keyed.values()
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)
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self._pending_edus_keyed = {}
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pending_edus.extend(device_message_edus)
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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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if pending_pdus:
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logger.debug("TX [%s] len(pending_pdus_by_dest[dest]) = %d",
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self._destination, len(pending_pdus))
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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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# 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 device_message_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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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, e.code, e,
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)
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except RequestSendFailed as e:
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logger.warning("TX [%s] Failed to send transaction: %s", self._destination, e)
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for p, _ in pending_pdus:
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logger.info("Failed to send event %s to %s", p.event_id,
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self._destination)
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except Exception:
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logger.exception(
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"TX [%s] Failed to send transaction",
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self._destination,
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)
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for p, _ in pending_pdus:
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logger.info("Failed to send event %s to %s", p.event_id,
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self._destination)
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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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@defer.inlineCallbacks
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def _get_new_device_messages(self):
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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
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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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last_device_list = self._last_device_list_stream_id
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now_stream_id, results = yield self._store.get_devices_by_remote(
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self._destination, last_device_list
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)
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edus.extend(
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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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defer.returnValue((edus, stream_id, now_stream_id))
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