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Merge pull request #4855 from matrix-org/rav/refactor_transaction_queue

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Split TransactionQueue up
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Richard van der Hoff 2019-03-15 12:32:11 +00:00 committed by GitHub
commit 3b7ceb2c69
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8 changed files with 865 additions and 761 deletions
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1
changelog.d/4855.misc Normal file
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@ -0,0 +1 @@
Refactor federation TransactionQueue.

14
synapse/federation/send_queue.py
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@ -46,7 +46,7 @@ logger = logging.getLogger(__name__)
class FederationRemoteSendQueue(object):
"""A drop in replacement for TransactionQueue"""
"""A drop in replacement for FederationSender"""
def __init__(self, hs):
self.server_name = hs.hostname
@ -154,13 +154,13 @@ class FederationRemoteSendQueue(object):
del self.device_messages[key]
def notify_new_events(self, current_id):
"""As per TransactionQueue"""
"""As per FederationSender"""
# We don't need to replicate this as it gets sent down a different
# stream.
pass
def build_and_send_edu(self, destination, edu_type, content, key=None):
"""As per TransactionQueue"""
"""As per FederationSender"""
if destination == self.server_name:
logger.info("Not sending EDU to ourselves")
return
@ -184,7 +184,7 @@ class FederationRemoteSendQueue(object):
self.notifier.on_new_replication_data()
def send_read_receipt(self, receipt):
"""As per TransactionQueue
"""As per FederationSender
Args:
receipt (synapse.types.ReadReceipt):
@ -193,7 +193,7 @@ class FederationRemoteSendQueue(object):
pass
def send_presence(self, states):
"""As per TransactionQueue
"""As per FederationSender
Args:
states (list(UserPresenceState))
@ -210,7 +210,7 @@ class FederationRemoteSendQueue(object):
self.notifier.on_new_replication_data()
def send_device_messages(self, destination):
"""As per TransactionQueue"""
"""As per FederationSender"""
pos = self._next_pos()
self.device_messages[pos] = destination
self.notifier.on_new_replication_data()
@ -448,7 +448,7 @@ def process_rows_for_federation(transaction_queue, rows):
transaction queue ready for sending to the relevant homeservers.
Args:
transaction_queue (TransactionQueue)
transaction_queue (FederationSender)
rows (list(synapse.replication.tcp.streams.FederationStreamRow))
"""

388
synapse/federation/sender/__init__.py Normal file
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# -*- coding: utf-8 -*-
# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from six import itervalues
from prometheus_client import Counter
from twisted.internet import defer
import synapse.metrics
from synapse.federation.sender.per_destination_queue import PerDestinationQueue
from synapse.federation.sender.transaction_manager import TransactionManager
from synapse.federation.units import Edu
from synapse.handlers.presence import get_interested_remotes
from synapse.metrics import (
LaterGauge,
event_processing_loop_counter,
event_processing_loop_room_count,
events_processed_counter,
)
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util import logcontext
from synapse.util.metrics import measure_func
logger = logging.getLogger(__name__)
sent_pdus_destination_dist_count = Counter(
"synapse_federation_client_sent_pdu_destinations:count",
"Number of PDUs queued for sending to one or more destinations",
)
sent_pdus_destination_dist_total = Counter(
"synapse_federation_client_sent_pdu_destinations:total", ""
"Total number of PDUs queued for sending across all destinations",
)
class FederationSender(object):
def __init__(self, hs):
self.hs = hs
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.clock = hs.get_clock()
self.is_mine_id = hs.is_mine_id
self._transaction_manager = TransactionManager(hs)
# map from destination to PerDestinationQueue
self._per_destination_queues = {} # type: dict[str, PerDestinationQueue]
LaterGauge(
"synapse_federation_transaction_queue_pending_destinations",
"",
[],
lambda: sum(
1 for d in self._per_destination_queues.values()
if d.transmission_loop_running
),
)
# Map of user_id -> UserPresenceState for all the pending presence
# to be sent out by user_id. Entries here get processed and put in
# pending_presence_by_dest
self.pending_presence = {}
LaterGauge(
"synapse_federation_transaction_queue_pending_pdus",
"",
[],
lambda: sum(
d.pending_pdu_count() for d in self._per_destination_queues.values()
),
)
LaterGauge(
"synapse_federation_transaction_queue_pending_edus",
"",
[],
lambda: sum(
d.pending_edu_count() for d in self._per_destination_queues.values()
),
)
self._order = 1
self._is_processing = False
self._last_poked_id = -1
self._processing_pending_presence = False
def _get_per_destination_queue(self, destination):
queue = self._per_destination_queues.get(destination)
if not queue:
queue = PerDestinationQueue(self.hs, self._transaction_manager, destination)
self._per_destination_queues[destination] = queue
return queue
def notify_new_events(self, current_id):
"""This gets called when we have some new events we might want to
send out to other servers.
"""
self._last_poked_id = max(current_id, self._last_poked_id)
if self._is_processing:
return
# fire off a processing loop in the background
run_as_background_process(
"process_event_queue_for_federation",
self._process_event_queue_loop,
)
@defer.inlineCallbacks
def _process_event_queue_loop(self):
try:
self._is_processing = True
while True:
last_token = yield self.store.get_federation_out_pos("events")
next_token, events = yield self.store.get_all_new_events_stream(
last_token, self._last_poked_id, limit=100,
)
logger.debug("Handling %s -> %s", last_token, next_token)
if not events and next_token >= self._last_poked_id:
break
@defer.inlineCallbacks
def handle_event(event):
# Only send events for this server.
send_on_behalf_of = event.internal_metadata.get_send_on_behalf_of()
is_mine = self.is_mine_id(event.sender)
if not is_mine and send_on_behalf_of is None:
return
try:
# Get the state from before the event.
# We need to make sure that this is the state from before
# the event and not from after it.
# Otherwise if the last member on a server in a room is
# banned then it won't receive the event because it won't
# be in the room after the ban.
destinations = yield self.state.get_current_hosts_in_room(
event.room_id, latest_event_ids=event.prev_event_ids(),
)
except Exception:
logger.exception(
"Failed to calculate hosts in room for event: %s",
event.event_id,
)
return
destinations = set(destinations)
if send_on_behalf_of is not None:
# If we are sending the event on behalf of another server
# then it already has the event and there is no reason to
# send the event to it.
destinations.discard(send_on_behalf_of)
logger.debug("Sending %s to %r", event, destinations)
self._send_pdu(event, destinations)
@defer.inlineCallbacks
def handle_room_events(events):
for event in events:
yield handle_event(event)
events_by_room = {}
for event in events:
events_by_room.setdefault(event.room_id, []).append(event)
yield logcontext.make_deferred_yieldable(defer.gatherResults(
[
logcontext.run_in_background(handle_room_events, evs)
for evs in itervalues(events_by_room)
],
consumeErrors=True
))
yield self.store.update_federation_out_pos(
"events", next_token
)
if events:
now = self.clock.time_msec()
ts = yield self.store.get_received_ts(events[-1].event_id)
synapse.metrics.event_processing_lag.labels(
"federation_sender").set(now - ts)
synapse.metrics.event_processing_last_ts.labels(
"federation_sender").set(ts)
events_processed_counter.inc(len(events))
event_processing_loop_room_count.labels(
"federation_sender"
).inc(len(events_by_room))
event_processing_loop_counter.labels("federation_sender").inc()
synapse.metrics.event_processing_positions.labels(
"federation_sender").set(next_token)
finally:
self._is_processing = False
def _send_pdu(self, pdu, destinations):
# We loop through all destinations to see whether we already have
# a transaction in progress. If we do, stick it in the pending_pdus
# table and we'll get back to it later.
order = self._order
self._order += 1
destinations = set(destinations)
destinations.discard(self.server_name)
logger.debug("Sending to: %s", str(destinations))
if not destinations:
return
sent_pdus_destination_dist_total.inc(len(destinations))
sent_pdus_destination_dist_count.inc()
for destination in destinations:
self._get_per_destination_queue(destination).send_pdu(pdu, order)
@defer.inlineCallbacks
def send_read_receipt(self, receipt):
"""Send a RR to any other servers in the room
Args:
receipt (synapse.types.ReadReceipt): receipt to be sent
"""
# Work out which remote servers should be poked and poke them.
domains = yield self.state.get_current_hosts_in_room(receipt.room_id)
domains = [d for d in domains if d != self.server_name]
if not domains:
return
logger.debug("Sending receipt to: %r", domains)
content = {
receipt.room_id: {
receipt.receipt_type: {
receipt.user_id: {
"event_ids": receipt.event_ids,
"data": receipt.data,
},
},
},
}
key = (receipt.room_id, receipt.receipt_type, receipt.user_id)
for domain in domains:
self.build_and_send_edu(
destination=domain,
edu_type="m.receipt",
content=content,
key=key,
)
@logcontext.preserve_fn # the caller should not yield on this
@defer.inlineCallbacks
def send_presence(self, states):
"""Send the new presence states to the appropriate destinations.
This actually queues up the presence states ready for sending and
triggers a background task to process them and send out the transactions.
Args:
states (list(UserPresenceState))
"""
if not self.hs.config.use_presence:
# No-op if presence is disabled.
return
# First we queue up the new presence by user ID, so multiple presence
# updates in quick successtion are correctly handled
# We only want to send presence for our own users, so lets always just
# filter here just in case.
self.pending_presence.update({
state.user_id: state for state in states
if self.is_mine_id(state.user_id)
})
# We then handle the new pending presence in batches, first figuring
# out the destinations we need to send each state to and then poking it
# to attempt a new transaction. We linearize this so that we don't
# accidentally mess up the ordering and send multiple presence updates
# in the wrong order
if self._processing_pending_presence:
return
self._processing_pending_presence = True
try:
while True:
states_map = self.pending_presence
self.pending_presence = {}
if not states_map:
break
yield self._process_presence_inner(list(states_map.values()))
except Exception:
logger.exception("Error sending presence states to servers")
finally:
self._processing_pending_presence = False
@measure_func("txnqueue._process_presence")
@defer.inlineCallbacks
def _process_presence_inner(self, states):
"""Given a list of states populate self.pending_presence_by_dest and
poke to send a new transaction to each destination
Args:
states (list(UserPresenceState))
"""
hosts_and_states = yield get_interested_remotes(self.store, states, self.state)
for destinations, states in hosts_and_states:
for destination in destinations:
if destination == self.server_name:
continue
self._get_per_destination_queue(destination).send_presence(states)
def build_and_send_edu(self, destination, edu_type, content, key=None):
"""Construct an Edu object, and queue it for sending
Args:
destination (str): name of server to send to
edu_type (str): type of EDU to send
content (dict): content of EDU
key (Any|None): clobbering key for this edu
"""
if destination == self.server_name:
logger.info("Not sending EDU to ourselves")
return
edu = Edu(
origin=self.server_name,
destination=destination,
edu_type=edu_type,
content=content,
)
self.send_edu(edu, key)
def send_edu(self, edu, key):
"""Queue an EDU for sending
Args:
edu (Edu): edu to send
key (Any|None): clobbering key for this edu
"""
queue = self._get_per_destination_queue(edu.destination)
if key:
queue.send_keyed_edu(edu, key)
else:
queue.send_edu(edu)
def send_device_messages(self, destination):
if destination == self.server_name:
logger.info("Not sending device update to ourselves")
return
self._get_per_destination_queue(destination).attempt_new_transaction()
def get_current_token(self):
return 0

318
synapse/federation/sender/per_destination_queue.py Normal file
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@ -0,0 +1,318 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import datetime
import logging
from prometheus_client import Counter
from twisted.internet import defer
from synapse.api.errors import (
FederationDeniedError,
HttpResponseException,
RequestSendFailed,
)
from synapse.events import EventBase
from synapse.federation.units import Edu
from synapse.handlers.presence import format_user_presence_state
from synapse.metrics import sent_transactions_counter
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage import UserPresenceState
from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
logger = logging.getLogger(__name__)
sent_edus_counter = Counter(
"synapse_federation_client_sent_edus",
"Total number of EDUs successfully sent",
)
sent_edus_by_type = Counter(
"synapse_federation_client_sent_edus_by_type",
"Number of sent EDUs successfully sent, by event type",
["type"],
)
class PerDestinationQueue(object):
"""
Manages the per-destination transmission queues.
Args:
hs (synapse.HomeServer):
transaction_sender (TransactionManager):
destination (str): the server_name of the destination that we are managing
transmission for.
"""
def __init__(self, hs, transaction_manager, destination):
self._server_name = hs.hostname
self._clock = hs.get_clock()
self._store = hs.get_datastore()
self._transaction_manager = transaction_manager
self._destination = destination
self.transmission_loop_running = False
# a list of tuples of (pending pdu, order)
self._pending_pdus = [] # type: list[tuple[EventBase, int]]
self._pending_edus = [] # type: list[Edu]
# Pending EDUs by their "key". Keyed EDUs are EDUs that get clobbered
# based on their key (e.g. typing events by room_id)
# Map of (edu_type, key) -> Edu
self._pending_edus_keyed = {} # type: dict[tuple[str, str], Edu]
# Map of user_id -> UserPresenceState of pending presence to be sent to this
# destination
self._pending_presence = {} # type: dict[str, UserPresenceState]
# stream_id of last successfully sent to-device message.
# NB: may be a long or an int.
self._last_device_stream_id = 0
# stream_id of last successfully sent device list update.
self._last_device_list_stream_id = 0
def pending_pdu_count(self):
return len(self._pending_pdus)
def pending_edu_count(self):
return (
len(self._pending_edus)
+ len(self._pending_presence)
+ len(self._pending_edus_keyed)
)
def send_pdu(self, pdu, order):
"""Add a PDU to the queue, and start the transmission loop if neccessary
Args:
pdu (EventBase): pdu to send
order (int):
"""
self._pending_pdus.append((pdu, order))
self.attempt_new_transaction()
def send_presence(self, states):
"""Add presence updates to the queue. Start the transmission loop if neccessary.
Args:
states (iterable[UserPresenceState]): presence to send
"""
self._pending_presence.update({
state.user_id: state for state in states
})
self.attempt_new_transaction()
def send_keyed_edu(self, edu, key):
self._pending_edus_keyed[(edu.edu_type, key)] = edu
self.attempt_new_transaction()
def send_edu(self, edu):
self._pending_edus.append(edu)
self.attempt_new_transaction()
def attempt_new_transaction(self):
"""Try to start a new transaction to this destination
If there is already a transaction in progress to this destination,
returns immediately. Otherwise kicks off the process of sending a
transaction in the background.
"""
# list of (pending_pdu, deferred, order)
if self.transmission_loop_running:
# XXX: this can get stuck on by a never-ending
# request at which point pending_pdus just keeps growing.
# we need application-layer timeouts of some flavour of these
# requests
logger.debug(
"TX [%s] Transaction already in progress",
self._destination
)
return
logger.debug("TX [%s] Starting transaction loop", self._destination)
run_as_background_process(
"federation_transaction_transmission_loop",
self._transaction_transmission_loop,
)
@defer.inlineCallbacks
def _transaction_transmission_loop(self):
pending_pdus = []
try:
self.transmission_loop_running = True
# This will throw if we wouldn't retry. We do this here so we fail
# quickly, but we will later check this again in the http client,
# hence why we throw the result away.
yield get_retry_limiter(self._destination, self._clock, self._store)
pending_pdus = []
while True:
device_message_edus, device_stream_id, dev_list_id = (
yield self._get_new_device_messages()
)
# BEGIN CRITICAL SECTION
#
# In order to avoid a race condition, we need to make sure that
# the following code (from popping the queues up to the point
# where we decide if we actually have any pending messages) is
# atomic - otherwise new PDUs or EDUs might arrive in the
# meantime, but not get sent because we hold the
# transmission_loop_running flag.
pending_pdus = self._pending_pdus
# We can only include at most 50 PDUs per transactions
pending_pdus, self._pending_pdus = pending_pdus[:50], pending_pdus[50:]
pending_edus = self._pending_edus
# We can only include at most 100 EDUs per transactions
pending_edus, self._pending_edus = pending_edus[:100], pending_edus[100:]
pending_edus.extend(
self._pending_edus_keyed.values()
)
self._pending_edus_keyed = {}
pending_edus.extend(device_message_edus)
pending_presence = self._pending_presence
self._pending_presence = {}
if pending_presence:
pending_edus.append(
Edu(
origin=self._server_name,
destination=self._destination,
edu_type="m.presence",
content={
"push": [
format_user_presence_state(
presence, self._clock.time_msec()
)
for presence in pending_presence.values()
]
},
)
)
if pending_pdus:
logger.debug("TX [%s] len(pending_pdus_by_dest[dest]) = %d",
self._destination, len(pending_pdus))
if not pending_pdus and not pending_edus:
logger.debug("TX [%s] Nothing to send", self._destination)
self._last_device_stream_id = device_stream_id
return
# END CRITICAL SECTION
success = yield self._transaction_manager.send_new_transaction(
self._destination, pending_pdus, pending_edus
)
if success:
sent_transactions_counter.inc()
sent_edus_counter.inc(len(pending_edus))
for edu in pending_edus:
sent_edus_by_type.labels(edu.edu_type).inc()
# Remove the acknowledged device messages from the database
# Only bother if we actually sent some device messages
if device_message_edus:
yield self._store.delete_device_msgs_for_remote(
self._destination, device_stream_id
)
logger.info(
"Marking as sent %r %r", self._destination, dev_list_id
)
yield self._store.mark_as_sent_devices_by_remote(
self._destination, dev_list_id
)
self._last_device_stream_id = device_stream_id
self._last_device_list_stream_id = 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",
self._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",
self._destination, e.code, e,
)
except RequestSendFailed as e:
logger.warning("TX [%s] Failed to send transaction: %s", self._destination, e)
for p, _ in pending_pdus:
logger.info("Failed to send event %s to %s", p.event_id,
self._destination)
except Exception:
logger.exception(
"TX [%s] Failed to send transaction",
self._destination,
)
for p, _ in pending_pdus:
logger.info("Failed to send event %s to %s", p.event_id,
self._destination)
finally:
# We want to be *very* sure we clear this after we stop processing
self.transmission_loop_running = False
@defer.inlineCallbacks
def _get_new_device_messages(self):
last_device_stream_id = self._last_device_stream_id
to_device_stream_id = self._store.get_to_device_stream_token()
contents, stream_id = yield self._store.get_new_device_msgs_for_remote(
self._destination, last_device_stream_id, to_device_stream_id
)
edus = [
Edu(
origin=self._server_name,
destination=self._destination,
edu_type="m.direct_to_device",
content=content,
)
for content in contents
]
last_device_list = self._last_device_list_stream_id
now_stream_id, results = yield self._store.get_devices_by_remote(
self._destination, last_device_list
)
edus.extend(
Edu(
origin=self._server_name,
destination=self._destination,
edu_type="m.device_list_update",
content=content,
)
for content in results
)
defer.returnValue((edus, stream_id, now_stream_id))

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synapse/federation/sender/transaction_manager.py Normal file
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# -*- coding: utf-8 -*-
# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from twisted.internet import defer
from synapse.api.errors import HttpResponseException
from synapse.federation.persistence import TransactionActions
from synapse.federation.units import Transaction
from synapse.util.metrics import measure_func
logger = logging.getLogger(__name__)
class TransactionManager(object):
"""Helper class which handles building and sending transactions
shared between PerDestinationQueue objects
"""
def __init__(self, hs):
self._server_name = hs.hostname
self.clock = hs.get_clock() # nb must be called this for @measure_func
self._store = hs.get_datastore()
self._transaction_actions = TransactionActions(self._store)
self._transport_layer = hs.get_federation_transport_client()
# HACK to get unique tx id
self._next_txn_id = int(self.clock.time_msec())
@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)

751
synapse/federation/transaction_queue.py
View file

@ -1,751 +0,0 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import datetime
import logging
from six import itervalues
from prometheus_client import Counter
from twisted.internet import defer
import synapse.metrics
from synapse.api.errors import (
FederationDeniedError,
HttpResponseException,
RequestSendFailed,
)
from synapse.handlers.presence import format_user_presence_state, get_interested_remotes
from synapse.metrics import (
LaterGauge,
event_processing_loop_counter,
event_processing_loop_room_count,
events_processed_counter,
sent_transactions_counter,
)
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util import logcontext
from synapse.util.metrics import measure_func
from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
from .persistence import TransactionActions
from .units import Edu, Transaction
logger = logging.getLogger(__name__)
sent_pdus_destination_dist_count = Counter(
"synapse_federation_client_sent_pdu_destinations:count",
"Number of PDUs queued for sending to one or more destinations",
)
sent_pdus_destination_dist_total = Counter(
"synapse_federation_client_sent_pdu_destinations:total", ""
"Total number of PDUs queued for sending across all destinations",
)
sent_edus_counter = Counter(
"synapse_federation_client_sent_edus",
"Total number of EDUs successfully sent",
)
sent_edus_by_type = Counter(
"synapse_federation_client_sent_edus_by_type",
"Number of sent EDUs successfully sent, by event type",
["type"],
)
class TransactionQueue(object):
"""This class makes sure we only have one transaction in flight at
a time for a given destination.
It batches pending PDUs into single transactions.
"""
def __init__(self, hs):
self.hs = hs
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.transaction_actions = TransactionActions(self.store)
self.transport_layer = hs.get_federation_transport_client()
self.clock = hs.get_clock()
self.is_mine_id = hs.is_mine_id
# Is a mapping from destinations -> deferreds. Used to keep track
# of which destinations have transactions in flight and when they are
# done
self.pending_transactions = {}
LaterGauge(
"synapse_federation_transaction_queue_pending_destinations",
"",
[],
lambda: len(self.pending_transactions),
)
# Is a mapping from destination -> list of
# tuple(pending pdus, deferred, order)
self.pending_pdus_by_dest = pdus = {}
# destination -> list of tuple(edu, deferred)
self.pending_edus_by_dest = edus = {}
# Map of user_id -> UserPresenceState for all the pending presence
# to be sent out by user_id. Entries here get processed and put in
# pending_presence_by_dest
self.pending_presence = {}
# Map of destination -> user_id -> UserPresenceState of pending presence
# to be sent to each destinations
self.pending_presence_by_dest = presence = {}
# Pending EDUs by their "key". Keyed EDUs are EDUs that get clobbered
# based on their key (e.g. typing events by room_id)
# Map of destination -> (edu_type, key) -> Edu
self.pending_edus_keyed_by_dest = edus_keyed = {}
LaterGauge(
"synapse_federation_transaction_queue_pending_pdus",
"",
[],
lambda: sum(map(len, pdus.values())),
)
LaterGauge(
"synapse_federation_transaction_queue_pending_edus",
"",
[],
lambda: (
sum(map(len, edus.values()))
+ sum(map(len, presence.values()))
+ sum(map(len, edus_keyed.values()))
),
)
# destination -> stream_id of last successfully sent to-device message.
# NB: may be a long or an int.
self.last_device_stream_id_by_dest = {}
# destination -> stream_id of last successfully sent device list
# update.
self.last_device_list_stream_id_by_dest = {}
# HACK to get unique tx id
self._next_txn_id = int(self.clock.time_msec())
self._order = 1
self._is_processing = False
self._last_poked_id = -1
self._processing_pending_presence = False
def notify_new_events(self, current_id):
"""This gets called when we have some new events we might want to
send out to other servers.
"""
self._last_poked_id = max(current_id, self._last_poked_id)
if self._is_processing:
return
# fire off a processing loop in the background
run_as_background_process(
"process_event_queue_for_federation",
self._process_event_queue_loop,
)
@defer.inlineCallbacks
def _process_event_queue_loop(self):
try:
self._is_processing = True
while True:
last_token = yield self.store.get_federation_out_pos("events")
next_token, events = yield self.store.get_all_new_events_stream(
last_token, self._last_poked_id, limit=100,
)
logger.debug("Handling %s -> %s", last_token, next_token)
if not events and next_token >= self._last_poked_id:
break
@defer.inlineCallbacks
def handle_event(event):
# Only send events for this server.
send_on_behalf_of = event.internal_metadata.get_send_on_behalf_of()
is_mine = self.is_mine_id(event.sender)
if not is_mine and send_on_behalf_of is None:
return
try:
# Get the state from before the event.
# We need to make sure that this is the state from before
# the event and not from after it.
# Otherwise if the last member on a server in a room is
# banned then it won't receive the event because it won't
# be in the room after the ban.
destinations = yield self.state.get_current_hosts_in_room(
event.room_id, latest_event_ids=event.prev_event_ids(),
)
except Exception:
logger.exception(
"Failed to calculate hosts in room for event: %s",
event.event_id,
)
return
destinations = set(destinations)
if send_on_behalf_of is not None:
# If we are sending the event on behalf of another server
# then it already has the event and there is no reason to
# send the event to it.
destinations.discard(send_on_behalf_of)
logger.debug("Sending %s to %r", event, destinations)
self._send_pdu(event, destinations)
@defer.inlineCallbacks
def handle_room_events(events):
for event in events:
yield handle_event(event)
events_by_room = {}
for event in events:
events_by_room.setdefault(event.room_id, []).append(event)
yield logcontext.make_deferred_yieldable(defer.gatherResults(
[
logcontext.run_in_background(handle_room_events, evs)
for evs in itervalues(events_by_room)
],
consumeErrors=True
))
yield self.store.update_federation_out_pos(
"events", next_token
)
if events:
now = self.clock.time_msec()
ts = yield self.store.get_received_ts(events[-1].event_id)
synapse.metrics.event_processing_lag.labels(
"federation_sender").set(now - ts)
synapse.metrics.event_processing_last_ts.labels(
"federation_sender").set(ts)
events_processed_counter.inc(len(events))
event_processing_loop_room_count.labels(
"federation_sender"
).inc(len(events_by_room))
event_processing_loop_counter.labels("federation_sender").inc()
synapse.metrics.event_processing_positions.labels(
"federation_sender").set(next_token)
finally:
self._is_processing = False
def _send_pdu(self, pdu, destinations):
# We loop through all destinations to see whether we already have
# a transaction in progress. If we do, stick it in the pending_pdus
# table and we'll get back to it later.
order = self._order
self._order += 1
destinations = set(destinations)
destinations.discard(self.server_name)
logger.debug("Sending to: %s", str(destinations))
if not destinations:
return
sent_pdus_destination_dist_total.inc(len(destinations))
sent_pdus_destination_dist_count.inc()
for destination in destinations:
self.pending_pdus_by_dest.setdefault(destination, []).append(
(pdu, order)
)
self._attempt_new_transaction(destination)
@defer.inlineCallbacks
def send_read_receipt(self, receipt):
"""Send a RR to any other servers in the room
Args:
receipt (synapse.types.ReadReceipt): receipt to be sent
"""
# Work out which remote servers should be poked and poke them.
domains = yield self.state.get_current_hosts_in_room(receipt.room_id)
domains = [d for d in domains if d != self.server_name]
if not domains:
return
logger.debug("Sending receipt to: %r", domains)
content = {
receipt.room_id: {
receipt.receipt_type: {
receipt.user_id: {
"event_ids": receipt.event_ids,
"data": receipt.data,
},
},
},
}
key = (receipt.room_id, receipt.receipt_type, receipt.user_id)
for domain in domains:
self.build_and_send_edu(
destination=domain,
edu_type="m.receipt",
content=content,
key=key,
)
@logcontext.preserve_fn # the caller should not yield on this
@defer.inlineCallbacks
def send_presence(self, states):
"""Send the new presence states to the appropriate destinations.
This actually queues up the presence states ready for sending and
triggers a background task to process them and send out the transactions.
Args:
states (list(UserPresenceState))
"""
if not self.hs.config.use_presence:
# No-op if presence is disabled.
return
# First we queue up the new presence by user ID, so multiple presence
# updates in quick successtion are correctly handled
# We only want to send presence for our own users, so lets always just
# filter here just in case.
self.pending_presence.update({
state.user_id: state for state in states
if self.is_mine_id(state.user_id)
})
# We then handle the new pending presence in batches, first figuring
# out the destinations we need to send each state to and then poking it
# to attempt a new transaction. We linearize this so that we don't
# accidentally mess up the ordering and send multiple presence updates
# in the wrong order
if self._processing_pending_presence:
return
self._processing_pending_presence = True
try:
while True:
states_map = self.pending_presence
self.pending_presence = {}
if not states_map:
break
yield self._process_presence_inner(list(states_map.values()))
except Exception:
logger.exception("Error sending presence states to servers")
finally:
self._processing_pending_presence = False
@measure_func("txnqueue._process_presence")
@defer.inlineCallbacks
def _process_presence_inner(self, states):
"""Given a list of states populate self.pending_presence_by_dest and
poke to send a new transaction to each destination
Args:
states (list(UserPresenceState))
"""
hosts_and_states = yield get_interested_remotes(self.store, states, self.state)
for destinations, states in hosts_and_states:
for destination in destinations:
if destination == self.server_name:
continue
self.pending_presence_by_dest.setdefault(
destination, {}
).update({
state.user_id: state for state in states
})
self._attempt_new_transaction(destination)
def build_and_send_edu(self, destination, edu_type, content, key=None):
"""Construct an Edu object, and queue it for sending
Args:
destination (str): name of server to send to
edu_type (str): type of EDU to send
content (dict): content of EDU
key (Any|None): clobbering key for this edu
"""
if destination == self.server_name:
logger.info("Not sending EDU to ourselves")
return
edu = Edu(
origin=self.server_name,
destination=destination,
edu_type=edu_type,
content=content,
)
self.send_edu(edu, key)
def send_edu(self, edu, key):
"""Queue an EDU for sending
Args:
edu (Edu): edu to send
key (Any|None): clobbering key for this edu
"""
if key:
self.pending_edus_keyed_by_dest.setdefault(
edu.destination, {}
)[(edu.edu_type, key)] = edu
else:
self.pending_edus_by_dest.setdefault(edu.destination, []).append(edu)
self._attempt_new_transaction(edu.destination)
def send_device_messages(self, destination):
if destination == self.server_name:
logger.info("Not sending device update to ourselves")
return
self._attempt_new_transaction(destination)
def get_current_token(self):
return 0
def _attempt_new_transaction(self, destination):
"""Try to start a new transaction to this destination
If there is already a transaction in progress to this destination,
returns immediately. Otherwise kicks off the process of sending a
transaction in the background.
Args:
destination (str):
Returns:
None
"""
# list of (pending_pdu, deferred, order)
if destination in self.pending_transactions:
# XXX: pending_transactions can get stuck on by a never-ending
# request at which point pending_pdus_by_dest just keeps growing.
# we need application-layer timeouts of some flavour of these
# requests
logger.debug(
"TX [%s] Transaction already in progress",
destination
)
return
logger.debug("TX [%s] Starting transaction loop", destination)
run_as_background_process(
"federation_transaction_transmission_loop",
self._transaction_transmission_loop,
destination,
)
@defer.inlineCallbacks
def _transaction_transmission_loop(self, destination):
pending_pdus = []
try:
self.pending_transactions[destination] = 1
# This will throw if we wouldn't retry. We do this here so we fail
# quickly, but we will later check this again in the http client,
# hence why we throw the result away.
yield get_retry_limiter(destination, self.clock, self.store)
pending_pdus = []
while True:
device_message_edus, device_stream_id, dev_list_id = (
yield self._get_new_device_messages(destination)
)
# BEGIN CRITICAL SECTION
#
# In order to avoid a race condition, we need to make sure that
# the following code (from popping the queues up to the point
# where we decide if we actually have any pending messages) is
# atomic - otherwise new PDUs or EDUs might arrive in the
# meantime, but not get sent because we hold the
# pending_transactions flag.
pending_pdus = self.pending_pdus_by_dest.pop(destination, [])
# We can only include at most 50 PDUs per transactions
pending_pdus, leftover_pdus = pending_pdus[:50], pending_pdus[50:]
if leftover_pdus:
self.pending_pdus_by_dest[destination] = leftover_pdus
pending_edus = self.pending_edus_by_dest.pop(destination, [])
# We can only include at most 100 EDUs per transactions
pending_edus, leftover_edus = pending_edus[:100], pending_edus[100:]
if leftover_edus:
self.pending_edus_by_dest[destination] = leftover_edus
pending_presence = self.pending_presence_by_dest.pop(destination, {})
pending_edus.extend(
self.pending_edus_keyed_by_dest.pop(destination, {}).values()
)
pending_edus.extend(device_message_edus)
if pending_presence:
pending_edus.append(
Edu(
origin=self.server_name,
destination=destination,
edu_type="m.presence",
content={
"push": [
format_user_presence_state(
presence, self.clock.time_msec()
)
for presence in pending_presence.values()
]
},
)
)
if pending_pdus:
logger.debug("TX [%s] len(pending_pdus_by_dest[dest]) = %d",
destination, len(pending_pdus))
if not pending_pdus and not pending_edus:
logger.debug("TX [%s] Nothing to send", destination)
self.last_device_stream_id_by_dest[destination] = (
device_stream_id
)
return
# END CRITICAL SECTION
success = yield self._send_new_transaction(
destination, pending_pdus, pending_edus,
)
if success:
sent_transactions_counter.inc()
sent_edus_counter.inc(len(pending_edus))
for edu in pending_edus:
sent_edus_by_type.labels(edu.edu_type).inc()
# Remove the acknowledged device messages from the database
# Only bother if we actually sent some device messages
if device_message_edus:
yield self.store.delete_device_msgs_for_remote(
destination, device_stream_id
)
logger.info("Marking as sent %r %r", destination, dev_list_id)
yield self.store.mark_as_sent_devices_by_remote(
destination, dev_list_id
)
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)

4
synapse/server.py
View file

@ -42,7 +42,7 @@ from synapse.federation.federation_server import (
ReplicationFederationHandlerRegistry,
)
from synapse.federation.send_queue import FederationRemoteSendQueue
from synapse.federation.transaction_queue import TransactionQueue
from synapse.federation.sender import FederationSender
from synapse.federation.transport.client import TransportLayerClient
from synapse.groups.attestations import GroupAttestationSigning, GroupAttestionRenewer
from synapse.groups.groups_server import GroupsServerHandler
@ -434,7 +434,7 @@ class HomeServer(object):
def build_federation_sender(self):
if self.should_send_federation():
return TransactionQueue(self)
return FederationSender(self)
elif not self.config.worker_app:
return FederationRemoteSendQueue(self)
else:

3
synapse/server.pyi
View file

@ -1,5 +1,6 @@
import synapse.api.auth
import synapse.config.homeserver
import synapse.federation.sender
import synapse.federation.transaction_queue
import synapse.federation.transport.client
import synapse.handlers
@ -62,7 +63,7 @@ class HomeServer(object):
def get_set_password_handler(self) -> synapse.handlers.set_password.SetPasswordHandler:
pass
def get_federation_sender(self) -> synapse.federation.transaction_queue.TransactionQueue:
def get_federation_sender(self) -> synapse.federation.sender.FederationSender:
pass
def get_federation_transport_client(self) -> synapse.federation.transport.client.TransportLayerClient: