717 lines
26 KiB
Python
717 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket 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 six import itervalues
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from prometheus_client import Counter
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from twisted.internet import defer
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import synapse.metrics
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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.handlers.presence import format_user_presence_state, get_interested_remotes
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from synapse.metrics import (
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LaterGauge,
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event_processing_loop_counter,
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event_processing_loop_room_count,
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events_processed_counter,
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sent_transactions_counter,
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)
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util import logcontext
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from synapse.util.metrics import measure_func
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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from .persistence import TransactionActions
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from .units import Edu, Transaction
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logger = logging.getLogger(__name__)
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sent_pdus_destination_dist_count = Counter(
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"synapse_federation_client_sent_pdu_destinations:count",
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"Number of PDUs queued for sending to one or more destinations",
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)
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sent_pdus_destination_dist_total = Counter(
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"synapse_federation_client_sent_pdu_destinations:total", ""
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"Total number of PDUs queued for sending across all destinations",
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)
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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 TransactionQueue(object):
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"""This class makes sure we only have one transaction in flight at
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a time for a given destination.
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It batches pending PDUs into single transactions.
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"""
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def __init__(self, hs):
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self.hs = hs
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self.server_name = hs.hostname
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self.store = hs.get_datastore()
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self.state = hs.get_state_handler()
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self.transaction_actions = TransactionActions(self.store)
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self.transport_layer = hs.get_federation_transport_client()
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self.clock = hs.get_clock()
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self.is_mine_id = hs.is_mine_id
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# Is a mapping from destinations -> deferreds. Used to keep track
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# of which destinations have transactions in flight and when they are
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# done
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self.pending_transactions = {}
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LaterGauge(
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"synapse_federation_transaction_queue_pending_destinations",
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"",
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[],
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lambda: len(self.pending_transactions),
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)
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# Is a mapping from destination -> list of
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# tuple(pending pdus, deferred, order)
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self.pending_pdus_by_dest = pdus = {}
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# destination -> list of tuple(edu, deferred)
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self.pending_edus_by_dest = edus = {}
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# Map of user_id -> UserPresenceState for all the pending presence
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# to be sent out by user_id. Entries here get processed and put in
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# pending_presence_by_dest
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self.pending_presence = {}
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# Map of destination -> user_id -> UserPresenceState of pending presence
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# to be sent to each destinations
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self.pending_presence_by_dest = presence = {}
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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 destination -> (edu_type, key) -> Edu
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self.pending_edus_keyed_by_dest = edus_keyed = {}
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LaterGauge(
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"synapse_federation_transaction_queue_pending_pdus",
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"",
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[],
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lambda: sum(map(len, pdus.values())),
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)
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LaterGauge(
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"synapse_federation_transaction_queue_pending_edus",
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"",
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[],
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lambda: (
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sum(map(len, edus.values()))
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+ sum(map(len, presence.values()))
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+ sum(map(len, edus_keyed.values()))
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),
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)
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# destination -> 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_by_dest = {}
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# destination -> stream_id of last successfully sent device list
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# update.
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self.last_device_list_stream_id_by_dest = {}
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# HACK to get unique tx id
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self._next_txn_id = int(self.clock.time_msec())
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self._order = 1
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self._is_processing = False
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self._last_poked_id = -1
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self._processing_pending_presence = False
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def notify_new_events(self, current_id):
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"""This gets called when we have some new events we might want to
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send out to other servers.
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"""
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self._last_poked_id = max(current_id, self._last_poked_id)
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if self._is_processing:
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return
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# fire off a processing loop in the background
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run_as_background_process(
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"process_event_queue_for_federation",
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self._process_event_queue_loop,
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)
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@defer.inlineCallbacks
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def _process_event_queue_loop(self):
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try:
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self._is_processing = True
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while True:
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last_token = yield self.store.get_federation_out_pos("events")
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next_token, events = yield self.store.get_all_new_events_stream(
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last_token, self._last_poked_id, limit=100,
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)
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logger.debug("Handling %s -> %s", last_token, next_token)
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if not events and next_token >= self._last_poked_id:
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break
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@defer.inlineCallbacks
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def handle_event(event):
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# Only send events for this server.
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send_on_behalf_of = event.internal_metadata.get_send_on_behalf_of()
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is_mine = self.is_mine_id(event.sender)
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if not is_mine and send_on_behalf_of is None:
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return
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try:
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# Get the state from before the event.
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# We need to make sure that this is the state from before
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# the event and not from after it.
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# Otherwise if the last member on a server in a room is
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# banned then it won't receive the event because it won't
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# be in the room after the ban.
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destinations = yield self.state.get_current_hosts_in_room(
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event.room_id, latest_event_ids=event.prev_event_ids(),
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)
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except Exception:
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logger.exception(
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"Failed to calculate hosts in room for event: %s",
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event.event_id,
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)
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return
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destinations = set(destinations)
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if send_on_behalf_of is not None:
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# If we are sending the event on behalf of another server
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# then it already has the event and there is no reason to
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# send the event to it.
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destinations.discard(send_on_behalf_of)
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logger.debug("Sending %s to %r", event, destinations)
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self._send_pdu(event, destinations)
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@defer.inlineCallbacks
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def handle_room_events(events):
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for event in events:
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yield handle_event(event)
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events_by_room = {}
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for event in events:
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events_by_room.setdefault(event.room_id, []).append(event)
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yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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logcontext.run_in_background(handle_room_events, evs)
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for evs in itervalues(events_by_room)
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],
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consumeErrors=True
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))
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yield self.store.update_federation_out_pos(
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"events", next_token
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)
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if events:
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now = self.clock.time_msec()
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ts = yield self.store.get_received_ts(events[-1].event_id)
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synapse.metrics.event_processing_lag.labels(
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"federation_sender").set(now - ts)
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synapse.metrics.event_processing_last_ts.labels(
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"federation_sender").set(ts)
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events_processed_counter.inc(len(events))
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event_processing_loop_room_count.labels(
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"federation_sender"
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).inc(len(events_by_room))
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event_processing_loop_counter.labels("federation_sender").inc()
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synapse.metrics.event_processing_positions.labels(
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"federation_sender").set(next_token)
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finally:
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self._is_processing = False
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def _send_pdu(self, pdu, destinations):
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# We loop through all destinations to see whether we already have
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# a transaction in progress. If we do, stick it in the pending_pdus
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# table and we'll get back to it later.
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order = self._order
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self._order += 1
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destinations = set(destinations)
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destinations.discard(self.server_name)
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logger.debug("Sending to: %s", str(destinations))
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if not destinations:
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return
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sent_pdus_destination_dist_total.inc(len(destinations))
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sent_pdus_destination_dist_count.inc()
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for destination in destinations:
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self.pending_pdus_by_dest.setdefault(destination, []).append(
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(pdu, order)
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)
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self._attempt_new_transaction(destination)
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@logcontext.preserve_fn # the caller should not yield on this
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@defer.inlineCallbacks
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def send_presence(self, states):
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"""Send the new presence states to the appropriate destinations.
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This actually queues up the presence states ready for sending and
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triggers a background task to process them and send out the transactions.
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Args:
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states (list(UserPresenceState))
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"""
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if not self.hs.config.use_presence:
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# No-op if presence is disabled.
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return
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# First we queue up the new presence by user ID, so multiple presence
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# updates in quick successtion are correctly handled
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# We only want to send presence for our own users, so lets always just
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# filter here just in case.
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self.pending_presence.update({
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state.user_id: state for state in states
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if self.is_mine_id(state.user_id)
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})
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# We then handle the new pending presence in batches, first figuring
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# out the destinations we need to send each state to and then poking it
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# to attempt a new transaction. We linearize this so that we don't
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# accidentally mess up the ordering and send multiple presence updates
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# in the wrong order
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if self._processing_pending_presence:
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return
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self._processing_pending_presence = True
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try:
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while True:
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states_map = self.pending_presence
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self.pending_presence = {}
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if not states_map:
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break
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yield self._process_presence_inner(list(states_map.values()))
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except Exception:
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logger.exception("Error sending presence states to servers")
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finally:
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self._processing_pending_presence = False
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@measure_func("txnqueue._process_presence")
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@defer.inlineCallbacks
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def _process_presence_inner(self, states):
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"""Given a list of states populate self.pending_presence_by_dest and
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poke to send a new transaction to each destination
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Args:
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states (list(UserPresenceState))
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"""
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hosts_and_states = yield get_interested_remotes(self.store, states, self.state)
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for destinations, states in hosts_and_states:
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for destination in destinations:
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if destination == self.server_name:
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continue
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self.pending_presence_by_dest.setdefault(
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destination, {}
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).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(destination)
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def build_and_send_edu(self, destination, edu_type, content, key=None):
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"""Construct an Edu object, and queue it for sending
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Args:
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destination (str): name of server to send to
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edu_type (str): type of EDU to send
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content (dict): content of EDU
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key (Any|None): clobbering key for this edu
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"""
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if destination == self.server_name:
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logger.info("Not sending EDU to ourselves")
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return
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edu = Edu(
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origin=self.server_name,
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destination=destination,
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edu_type=edu_type,
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content=content,
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)
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self.send_edu(edu, key)
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def send_edu(self, edu, key):
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"""Queue an EDU for sending
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Args:
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edu (Edu): edu to send
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key (Any|None): clobbering key for this edu
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"""
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if key:
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self.pending_edus_keyed_by_dest.setdefault(
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edu.destination, {}
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)[(edu.edu_type, key)] = edu
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else:
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self.pending_edus_by_dest.setdefault(edu.destination, []).append(edu)
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self._attempt_new_transaction(edu.destination)
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def send_device_messages(self, destination):
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if destination == self.server_name:
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logger.info("Not sending device update to ourselves")
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return
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self._attempt_new_transaction(destination)
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def get_current_token(self):
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return 0
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def _attempt_new_transaction(self, destination):
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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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Args:
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destination (str):
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Returns:
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None
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"""
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# list of (pending_pdu, deferred, order)
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if destination in self.pending_transactions:
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# XXX: pending_transactions can get stuck on by a never-ending
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# request at which point pending_pdus_by_dest 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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destination
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)
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return
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logger.debug("TX [%s] Starting transaction loop", 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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destination,
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)
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@defer.inlineCallbacks
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def _transaction_transmission_loop(self, destination):
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pending_pdus = []
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try:
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self.pending_transactions[destination] = 1
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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(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(destination)
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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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# pending_transactions flag.
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pending_pdus = self.pending_pdus_by_dest.pop(destination, [])
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# We can only include at most 50 PDUs per transactions
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pending_pdus, leftover_pdus = pending_pdus[:50], pending_pdus[50:]
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if leftover_pdus:
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self.pending_pdus_by_dest[destination] = leftover_pdus
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pending_edus = self.pending_edus_by_dest.pop(destination, [])
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# We can only include at most 100 EDUs per transactions
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pending_edus, leftover_edus = pending_edus[:100], pending_edus[100:]
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if leftover_edus:
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self.pending_edus_by_dest[destination] = leftover_edus
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pending_presence = self.pending_presence_by_dest.pop(destination, {})
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pending_edus.extend(
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self.pending_edus_keyed_by_dest.pop(destination, {}).values()
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)
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pending_edus.extend(device_message_edus)
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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=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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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", destination)
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self.last_device_stream_id_by_dest[destination] = (
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device_stream_id
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)
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return
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# END CRITICAL SECTION
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success = yield self._send_new_transaction(
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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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destination, device_stream_id
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)
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logger.info("Marking as sent %r %r", destination, dev_list_id)
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yield self.store.mark_as_sent_devices_by_remote(
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destination, dev_list_id
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|
)
|
|
|
|
self.last_device_stream_id_by_dest[destination] = device_stream_id
|
|
self.last_device_list_stream_id_by_dest[destination] = dev_list_id
|
|
else:
|
|
break
|
|
except NotRetryingDestination as e:
|
|
logger.debug(
|
|
"TX [%s] not ready for retry yet (next retry at %s) - "
|
|
"dropping transaction for now",
|
|
destination,
|
|
datetime.datetime.fromtimestamp(
|
|
(e.retry_last_ts + e.retry_interval) / 1000.0
|
|
),
|
|
)
|
|
except FederationDeniedError as e:
|
|
logger.info(e)
|
|
except HttpResponseException as e:
|
|
logger.warning(
|
|
"TX [%s] Received %d response to transaction: %s",
|
|
destination, e.code, e,
|
|
)
|
|
except RequestSendFailed as e:
|
|
logger.warning("TX [%s] Failed to send transaction: %s", destination, e)
|
|
|
|
for p, _ in pending_pdus:
|
|
logger.info("Failed to send event %s to %s", p.event_id,
|
|
destination)
|
|
except Exception:
|
|
logger.exception(
|
|
"TX [%s] Failed to send transaction",
|
|
destination,
|
|
)
|
|
for p, _ in pending_pdus:
|
|
logger.info("Failed to send event %s to %s", p.event_id,
|
|
destination)
|
|
finally:
|
|
# We want to be *very* sure we delete this after we stop processing
|
|
self.pending_transactions.pop(destination, None)
|
|
|
|
@defer.inlineCallbacks
|
|
def _get_new_device_messages(self, destination):
|
|
last_device_stream_id = self.last_device_stream_id_by_dest.get(destination, 0)
|
|
to_device_stream_id = self.store.get_to_device_stream_token()
|
|
contents, stream_id = yield self.store.get_new_device_msgs_for_remote(
|
|
destination, last_device_stream_id, to_device_stream_id
|
|
)
|
|
edus = [
|
|
Edu(
|
|
origin=self.server_name,
|
|
destination=destination,
|
|
edu_type="m.direct_to_device",
|
|
content=content,
|
|
)
|
|
for content in contents
|
|
]
|
|
|
|
last_device_list = self.last_device_list_stream_id_by_dest.get(destination, 0)
|
|
now_stream_id, results = yield self.store.get_devices_by_remote(
|
|
destination, last_device_list
|
|
)
|
|
edus.extend(
|
|
Edu(
|
|
origin=self.server_name,
|
|
destination=destination,
|
|
edu_type="m.device_list_update",
|
|
content=content,
|
|
)
|
|
for content in results
|
|
)
|
|
defer.returnValue((edus, stream_id, now_stream_id))
|
|
|
|
@measure_func("_send_new_transaction")
|
|
@defer.inlineCallbacks
|
|
def _send_new_transaction(self, destination, pending_pdus, pending_edus):
|
|
|
|
# Sort based on the order field
|
|
pending_pdus.sort(key=lambda t: t[1])
|
|
pdus = [x[0] for x in pending_pdus]
|
|
edus = pending_edus
|
|
|
|
success = True
|
|
|
|
logger.debug("TX [%s] _attempt_new_transaction", destination)
|
|
|
|
txn_id = str(self._next_txn_id)
|
|
|
|
logger.debug(
|
|
"TX [%s] {%s} Attempting new transaction"
|
|
" (pdus: %d, edus: %d)",
|
|
destination, txn_id,
|
|
len(pdus),
|
|
len(edus),
|
|
)
|
|
|
|
logger.debug("TX [%s] Persisting transaction...", destination)
|
|
|
|
transaction = Transaction.create_new(
|
|
origin_server_ts=int(self.clock.time_msec()),
|
|
transaction_id=txn_id,
|
|
origin=self.server_name,
|
|
destination=destination,
|
|
pdus=pdus,
|
|
edus=edus,
|
|
)
|
|
|
|
self._next_txn_id += 1
|
|
|
|
yield self.transaction_actions.prepare_to_send(transaction)
|
|
|
|
logger.debug("TX [%s] Persisted transaction", destination)
|
|
logger.info(
|
|
"TX [%s] {%s} Sending transaction [%s],"
|
|
" (PDUs: %d, EDUs: %d)",
|
|
destination, txn_id,
|
|
transaction.transaction_id,
|
|
len(pdus),
|
|
len(edus),
|
|
)
|
|
|
|
# Actually send the transaction
|
|
|
|
# FIXME (erikj): This is a bit of a hack to make the Pdu age
|
|
# keys work
|
|
def json_data_cb():
|
|
data = transaction.get_dict()
|
|
now = int(self.clock.time_msec())
|
|
if "pdus" in data:
|
|
for p in data["pdus"]:
|
|
if "age_ts" in p:
|
|
unsigned = p.setdefault("unsigned", {})
|
|
unsigned["age"] = now - int(p["age_ts"])
|
|
del p["age_ts"]
|
|
return data
|
|
|
|
try:
|
|
response = yield self.transport_layer.send_transaction(
|
|
transaction, json_data_cb
|
|
)
|
|
code = 200
|
|
except HttpResponseException as e:
|
|
code = e.code
|
|
response = e.response
|
|
|
|
if e.code in (401, 404, 429) or 500 <= e.code:
|
|
logger.info(
|
|
"TX [%s] {%s} got %d response",
|
|
destination, txn_id, code
|
|
)
|
|
raise e
|
|
|
|
logger.info(
|
|
"TX [%s] {%s} got %d response",
|
|
destination, txn_id, code
|
|
)
|
|
|
|
yield self.transaction_actions.delivered(
|
|
transaction, code, response
|
|
)
|
|
|
|
logger.debug("TX [%s] {%s} Marked as delivered", destination, txn_id)
|
|
|
|
if code == 200:
|
|
for e_id, r in response.get("pdus", {}).items():
|
|
if "error" in r:
|
|
logger.warn(
|
|
"TX [%s] {%s} Remote returned error for %s: %s",
|
|
destination, txn_id, e_id, r,
|
|
)
|
|
else:
|
|
for p in pdus:
|
|
logger.warn(
|
|
"TX [%s] {%s} Failed to send event %s",
|
|
destination, txn_id, p.event_id,
|
|
)
|
|
success = False
|
|
|
|
defer.returnValue(success)
|