mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
9255a6cb17
There were a bunch of places where we fire off a process to happen in the background, but don't have any exception handling on it - instead relying on the unhandled error being logged when the relevent deferred gets garbage-collected. This is unsatisfactory for a number of reasons: - logging on garbage collection is best-effort and may happen some time after the error, if at all - it can be hard to figure out where the error actually happened. - it is logged as a scary CRITICAL error which (a) I always forget to grep for and (b) it's not really CRITICAL if a background process we don't care about fails. So this is an attempt to add exception handling to everything we fire off into the background.
697 lines
25 KiB
Python
697 lines
25 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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from twisted.internet import defer
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from .persistence import TransactionActions
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from .units import Transaction, Edu
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from synapse.api.errors import HttpResponseException, FederationDeniedError
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from synapse.util import logcontext, PreserveLoggingContext
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from synapse.util.async import run_on_reactor
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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from synapse.util.metrics import measure_func
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from synapse.handlers.presence import format_user_presence_state, get_interested_remotes
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import synapse.metrics
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import logging
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logger = logging.getLogger(__name__)
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metrics = synapse.metrics.get_metrics_for(__name__)
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client_metrics = synapse.metrics.get_metrics_for("synapse.federation.client")
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sent_pdus_destination_dist = client_metrics.register_distribution(
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"sent_pdu_destinations"
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)
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sent_edus_counter = client_metrics.register_counter("sent_edus")
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sent_transactions_counter = client_metrics.register_counter("sent_transactions")
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events_processed_counter = client_metrics.register_counter("events_processed")
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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.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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metrics.register_callback(
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"pending_destinations",
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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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metrics.register_callback(
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"pending_pdus",
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lambda: sum(map(len, pdus.values())),
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)
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metrics.register_callback(
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"pending_edus",
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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 -> list of tuple(failure, deferred)
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self.pending_failures_by_dest = {}
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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 can_send_to(self, destination):
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"""Can we send messages to the given server?
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We can't send messages to ourselves. If we are running on localhost
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then we can only federation with other servers running on localhost.
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Otherwise we only federate with servers on a public domain.
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Args:
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destination(str): The server we are possibly trying to send to.
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Returns:
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bool: True if we can send to the server.
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"""
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if destination == self.server_name:
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return False
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if self.server_name.startswith("localhost"):
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return destination.startswith("localhost")
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else:
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return not destination.startswith("localhost")
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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. It's likely it will
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# outlast the current request, so run it in the sentinel logcontext.
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with PreserveLoggingContext():
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self._process_event_queue_loop()
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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.event_id)
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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=[
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prev_id for prev_id, _ in event.prev_events
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],
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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 events_by_room.itervalues()
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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.set(
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now - ts, "federation_sender",
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)
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synapse.metrics.event_processing_last_ts.set(
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ts, "federation_sender",
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)
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events_processed_counter.inc_by(len(events))
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synapse.metrics.event_processing_positions.set(
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next_token, "federation_sender",
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)
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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 = set(
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dest for dest in destinations if self.can_send_to(dest)
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)
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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.inc_by(len(destinations))
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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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# 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(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 not self.can_send_to(destination):
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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 send_edu(self, destination, edu_type, content, key=None):
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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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if not self.can_send_to(destination):
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return
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sent_edus_counter.inc()
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if key:
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self.pending_edus_keyed_by_dest.setdefault(
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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(destination, []).append(edu)
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self._attempt_new_transaction(destination)
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def send_failure(self, failure, destination):
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if destination == self.server_name or destination == "localhost":
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return
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if not self.can_send_to(destination):
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return
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self.pending_failures_by_dest.setdefault(
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destination, []
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).append(failure)
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self._attempt_new_transaction(destination)
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def send_device_messages(self, destination):
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if destination == self.server_name or destination == "localhost":
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return
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if not self.can_send_to(destination):
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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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# Drop the logcontext before starting the transaction. It doesn't
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# really make sense to log all the outbound transactions against
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# whatever path led us to this point: that's pretty arbitrary really.
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#
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# (this also means we can fire off _perform_transaction without
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# yielding)
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with logcontext.PreserveLoggingContext():
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self._transaction_transmission_loop(destination)
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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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# XXX: what's this for?
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yield run_on_reactor()
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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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pending_edus = self.pending_edus_by_dest.pop(destination, [])
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pending_presence = self.pending_presence_by_dest.pop(destination, {})
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pending_failures = self.pending_failures_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 and not pending_failures:
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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, pending_failures,
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)
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if success:
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sent_transactions_counter.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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)
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self.last_device_stream_id_by_dest[destination] = device_stream_id
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self.last_device_list_stream_id_by_dest[destination] = dev_list_id
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else:
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break
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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 Exception as e:
|
|
logger.warn(
|
|
"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)
|
|
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,
|
|
pending_failures):
|
|
|
|
# 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
|
|
failures = [x.get_dict() for x in pending_failures]
|
|
|
|
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, failures: %d)",
|
|
destination, txn_id,
|
|
len(pdus),
|
|
len(edus),
|
|
len(failures)
|
|
)
|
|
|
|
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,
|
|
pdu_failures=failures,
|
|
)
|
|
|
|
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, failures: %d)",
|
|
destination, txn_id,
|
|
transaction.transaction_id,
|
|
len(pdus),
|
|
len(edus),
|
|
len(failures),
|
|
)
|
|
|
|
# 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
|
|
|
|
if response:
|
|
for e_id, r in response.get("pdus", {}).items():
|
|
if "error" in r:
|
|
logger.warn(
|
|
"Transaction returned error for %s: %s",
|
|
e_id, r,
|
|
)
|
|
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
|
|
)
|
|
|
|
logger.debug("TX [%s] Sent transaction", destination)
|
|
logger.debug("TX [%s] Marking as delivered...", destination)
|
|
|
|
yield self.transaction_actions.delivered(
|
|
transaction, code, response
|
|
)
|
|
|
|
logger.debug("TX [%s] Marked as delivered", destination)
|
|
|
|
if code != 200:
|
|
for p in pdus:
|
|
logger.info(
|
|
"Failed to send event %s to %s", p.event_id, destination
|
|
)
|
|
success = False
|
|
|
|
defer.returnValue(success)
|