619 lines
23 KiB
Python
619 lines
23 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations Ltd
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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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 logging
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from typing import Any, Dict, Iterable, Iterator, List, Optional, Set, Tuple, TypeVar
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from prometheus_client import Counter
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from twisted.internet.protocol import ReconnectingClientFactory
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from synapse.metrics import LaterGauge
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from synapse.replication.tcp.client import DirectTcpReplicationClientFactory
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from synapse.replication.tcp.commands import (
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ClearUserSyncsCommand,
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Command,
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FederationAckCommand,
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PositionCommand,
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RdataCommand,
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RemoteServerUpCommand,
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RemovePusherCommand,
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ReplicateCommand,
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UserIpCommand,
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UserSyncCommand,
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)
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from synapse.replication.tcp.protocol import AbstractConnection
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from synapse.replication.tcp.streams import (
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STREAMS_MAP,
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BackfillStream,
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CachesStream,
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EventsStream,
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FederationStream,
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Stream,
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)
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from synapse.util.async_helpers import Linearizer
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logger = logging.getLogger(__name__)
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# number of updates received for each RDATA stream
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inbound_rdata_count = Counter(
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"synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"]
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)
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user_sync_counter = Counter("synapse_replication_tcp_resource_user_sync", "")
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federation_ack_counter = Counter("synapse_replication_tcp_resource_federation_ack", "")
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remove_pusher_counter = Counter("synapse_replication_tcp_resource_remove_pusher", "")
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invalidate_cache_counter = Counter(
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"synapse_replication_tcp_resource_invalidate_cache", ""
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)
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user_ip_cache_counter = Counter("synapse_replication_tcp_resource_user_ip_cache", "")
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class ReplicationCommandHandler:
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"""Handles incoming commands from replication as well as sending commands
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back out to connections.
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"""
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def __init__(self, hs):
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self._replication_data_handler = hs.get_replication_data_handler()
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self._presence_handler = hs.get_presence_handler()
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self._store = hs.get_datastore()
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self._notifier = hs.get_notifier()
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self._clock = hs.get_clock()
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self._instance_id = hs.get_instance_id()
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self._instance_name = hs.get_instance_name()
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self._streams = {
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stream.NAME: stream(hs) for stream in STREAMS_MAP.values()
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} # type: Dict[str, Stream]
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# List of streams that this instance is the source of
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self._streams_to_replicate = [] # type: List[Stream]
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for stream in self._streams.values():
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if stream.NAME == CachesStream.NAME:
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# All workers can write to the cache invalidation stream.
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self._streams_to_replicate.append(stream)
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continue
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if isinstance(stream, (EventsStream, BackfillStream)):
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# Only add EventStream and BackfillStream as a source on the
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# instance in charge of event persistence.
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if hs.config.worker.writers.events == hs.get_instance_name():
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self._streams_to_replicate.append(stream)
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continue
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# Only add any other streams if we're on master.
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if hs.config.worker_app is not None:
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continue
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if stream.NAME == FederationStream.NAME and hs.config.send_federation:
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# We only support federation stream if federation sending
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# has been disabled on the master.
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continue
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self._streams_to_replicate.append(stream)
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self._position_linearizer = Linearizer(
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"replication_position", clock=self._clock
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)
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# Map of stream name to batched updates. See RdataCommand for info on
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# how batching works.
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self._pending_batches = {} # type: Dict[str, List[Any]]
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# The factory used to create connections.
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self._factory = None # type: Optional[ReconnectingClientFactory]
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# The currently connected connections. (The list of places we need to send
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# outgoing replication commands to.)
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self._connections = [] # type: List[AbstractConnection]
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# For each connection, the incoming stream names that are coming from
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# that connection.
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self._streams_by_connection = {} # type: Dict[AbstractConnection, Set[str]]
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LaterGauge(
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"synapse_replication_tcp_resource_total_connections",
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"",
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[],
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lambda: len(self._connections),
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)
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self._is_master = hs.config.worker_app is None
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self._federation_sender = None
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if self._is_master and not hs.config.send_federation:
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self._federation_sender = hs.get_federation_sender()
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self._server_notices_sender = None
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if self._is_master:
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self._server_notices_sender = hs.get_server_notices_sender()
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def start_replication(self, hs):
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"""Helper method to start a replication connection to the remote server
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using TCP.
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"""
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if hs.config.redis.redis_enabled:
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import txredisapi
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from synapse.replication.tcp.redis import (
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RedisDirectTcpReplicationClientFactory,
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)
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logger.info(
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"Connecting to redis (host=%r port=%r)",
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hs.config.redis_host,
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hs.config.redis_port,
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)
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# First let's ensure that we have a ReplicationStreamer started.
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hs.get_replication_streamer()
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# We need two connections to redis, one for the subscription stream and
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# one to send commands to (as you can't send further redis commands to a
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# connection after SUBSCRIBE is called).
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# First create the connection for sending commands.
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outbound_redis_connection = txredisapi.lazyConnection(
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host=hs.config.redis_host,
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port=hs.config.redis_port,
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password=hs.config.redis.redis_password,
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reconnect=True,
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)
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# Now create the factory/connection for the subscription stream.
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self._factory = RedisDirectTcpReplicationClientFactory(
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hs, outbound_redis_connection
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)
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hs.get_reactor().connectTCP(
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hs.config.redis.redis_host, hs.config.redis.redis_port, self._factory,
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)
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else:
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client_name = hs.get_instance_name()
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self._factory = DirectTcpReplicationClientFactory(hs, client_name, self)
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host = hs.config.worker_replication_host
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port = hs.config.worker_replication_port
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hs.get_reactor().connectTCP(host, port, self._factory)
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def get_streams(self) -> Dict[str, Stream]:
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"""Get a map from stream name to all streams.
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"""
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return self._streams
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def get_streams_to_replicate(self) -> List[Stream]:
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"""Get a list of streams that this instances replicates.
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"""
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return self._streams_to_replicate
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async def on_REPLICATE(self, conn: AbstractConnection, cmd: ReplicateCommand):
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self.send_positions_to_connection(conn)
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def send_positions_to_connection(self, conn: AbstractConnection):
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"""Send current position of all streams this process is source of to
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the connection.
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"""
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# We respond with current position of all streams this instance
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# replicates.
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for stream in self.get_streams_to_replicate():
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self.send_command(
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PositionCommand(
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stream.NAME,
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self._instance_name,
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stream.current_token(self._instance_name),
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)
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)
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async def on_USER_SYNC(self, conn: AbstractConnection, cmd: UserSyncCommand):
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user_sync_counter.inc()
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if self._is_master:
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await self._presence_handler.update_external_syncs_row(
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cmd.instance_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms
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)
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async def on_CLEAR_USER_SYNC(
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self, conn: AbstractConnection, cmd: ClearUserSyncsCommand
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):
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if self._is_master:
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await self._presence_handler.update_external_syncs_clear(cmd.instance_id)
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async def on_FEDERATION_ACK(
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self, conn: AbstractConnection, cmd: FederationAckCommand
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):
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federation_ack_counter.inc()
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if self._federation_sender:
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self._federation_sender.federation_ack(cmd.instance_name, cmd.token)
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async def on_REMOVE_PUSHER(
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self, conn: AbstractConnection, cmd: RemovePusherCommand
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):
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remove_pusher_counter.inc()
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if self._is_master:
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await self._store.delete_pusher_by_app_id_pushkey_user_id(
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app_id=cmd.app_id, pushkey=cmd.push_key, user_id=cmd.user_id
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)
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self._notifier.on_new_replication_data()
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async def on_USER_IP(self, conn: AbstractConnection, cmd: UserIpCommand):
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user_ip_cache_counter.inc()
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if self._is_master:
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await self._store.insert_client_ip(
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cmd.user_id,
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cmd.access_token,
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cmd.ip,
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cmd.user_agent,
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cmd.device_id,
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cmd.last_seen,
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)
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if self._server_notices_sender:
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await self._server_notices_sender.on_user_ip(cmd.user_id)
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async def on_RDATA(self, conn: AbstractConnection, cmd: RdataCommand):
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if cmd.instance_name == self._instance_name:
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# Ignore RDATA that are just our own echoes
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return
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stream_name = cmd.stream_name
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inbound_rdata_count.labels(stream_name).inc()
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try:
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row = STREAMS_MAP[stream_name].parse_row(cmd.row)
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except Exception:
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logger.exception("Failed to parse RDATA: %r %r", stream_name, cmd.row)
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raise
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# We linearize here for two reasons:
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# 1. so we don't try and concurrently handle multiple rows for the
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# same stream, and
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# 2. so we don't race with getting a POSITION command and fetching
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# missing RDATA.
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with await self._position_linearizer.queue(cmd.stream_name):
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# make sure that we've processed a POSITION for this stream *on this
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# connection*. (A POSITION on another connection is no good, as there
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# is no guarantee that we have seen all the intermediate updates.)
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sbc = self._streams_by_connection.get(conn)
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if not sbc or stream_name not in sbc:
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# Let's drop the row for now, on the assumption we'll receive a
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# `POSITION` soon and we'll catch up correctly then.
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logger.debug(
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"Discarding RDATA for unconnected stream %s -> %s",
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stream_name,
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cmd.token,
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)
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return
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if cmd.token is None:
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# I.e. this is part of a batch of updates for this stream (in
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# which case batch until we get an update for the stream with a non
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# None token).
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self._pending_batches.setdefault(stream_name, []).append(row)
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else:
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# Check if this is the last of a batch of updates
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rows = self._pending_batches.pop(stream_name, [])
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rows.append(row)
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stream = self._streams.get(stream_name)
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if not stream:
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logger.error("Got RDATA for unknown stream: %s", stream_name)
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return
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# Find where we previously streamed up to.
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current_token = stream.current_token(cmd.instance_name)
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# Discard this data if this token is earlier than the current
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# position. Note that streams can be reset (in which case you
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# expect an earlier token), but that must be preceded by a
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# POSITION command.
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if cmd.token <= current_token:
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logger.debug(
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"Discarding RDATA from stream %s at position %s before previous position %s",
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stream_name,
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cmd.token,
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current_token,
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)
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else:
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await self.on_rdata(stream_name, cmd.instance_name, cmd.token, rows)
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async def on_rdata(
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self, stream_name: str, instance_name: str, token: int, rows: list
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):
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"""Called to handle a batch of replication data with a given stream token.
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Args:
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stream_name: name of the replication stream for this batch of rows
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instance_name: the instance that wrote the rows.
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token: stream token for this batch of rows
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rows: a list of Stream.ROW_TYPE objects as returned by
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Stream.parse_row.
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"""
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logger.debug("Received rdata %s (%s) -> %s", stream_name, instance_name, token)
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await self._replication_data_handler.on_rdata(
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stream_name, instance_name, token, rows
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)
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async def on_POSITION(self, conn: AbstractConnection, cmd: PositionCommand):
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if cmd.instance_name == self._instance_name:
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# Ignore POSITION that are just our own echoes
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return
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logger.info("Handling '%s %s'", cmd.NAME, cmd.to_line())
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stream_name = cmd.stream_name
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stream = self._streams.get(stream_name)
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if not stream:
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logger.error("Got POSITION for unknown stream: %s", stream_name)
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return
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# We protect catching up with a linearizer in case the replication
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# connection reconnects under us.
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with await self._position_linearizer.queue(stream_name):
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# We're about to go and catch up with the stream, so remove from set
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# of connected streams.
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for streams in self._streams_by_connection.values():
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streams.discard(stream_name)
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# We clear the pending batches for the stream as the fetching of the
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# missing updates below will fetch all rows in the batch.
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self._pending_batches.pop(stream_name, [])
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# Find where we previously streamed up to.
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current_token = stream.current_token(cmd.instance_name)
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# If the position token matches our current token then we're up to
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# date and there's nothing to do. Otherwise, fetch all updates
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# between then and now.
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missing_updates = cmd.token != current_token
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while missing_updates:
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logger.info(
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"Fetching replication rows for '%s' between %i and %i",
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stream_name,
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current_token,
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cmd.token,
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)
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(
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updates,
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current_token,
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missing_updates,
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) = await stream.get_updates_since(
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cmd.instance_name, current_token, cmd.token
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)
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# TODO: add some tests for this
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# Some streams return multiple rows with the same stream IDs,
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# which need to be processed in batches.
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for token, rows in _batch_updates(updates):
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await self.on_rdata(
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stream_name,
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cmd.instance_name,
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token,
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[stream.parse_row(row) for row in rows],
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)
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logger.info("Caught up with stream '%s' to %i", stream_name, cmd.token)
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# We've now caught up to position sent to us, notify handler.
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await self._replication_data_handler.on_position(
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cmd.stream_name, cmd.instance_name, cmd.token
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)
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self._streams_by_connection.setdefault(conn, set()).add(stream_name)
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async def on_REMOTE_SERVER_UP(
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self, conn: AbstractConnection, cmd: RemoteServerUpCommand
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):
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""""Called when get a new REMOTE_SERVER_UP command."""
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self._replication_data_handler.on_remote_server_up(cmd.data)
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self._notifier.notify_remote_server_up(cmd.data)
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# We relay to all other connections to ensure every instance gets the
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# notification.
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#
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# When configured to use redis we'll always only have one connection and
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# so this is a no-op (all instances will have already received the same
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# REMOTE_SERVER_UP command).
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#
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# For direct TCP connections this will relay to all other connections
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# connected to us. When on master this will correctly fan out to all
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# other direct TCP clients and on workers there'll only be the one
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# connection to master.
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#
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# (The logic here should also be sound if we have a mix of Redis and
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# direct TCP connections so long as there is only one traffic route
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# between two instances, but that is not currently supported).
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self.send_command(cmd, ignore_conn=conn)
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def new_connection(self, connection: AbstractConnection):
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"""Called when we have a new connection.
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"""
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self._connections.append(connection)
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# If we are connected to replication as a client (rather than a server)
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# we need to reset the reconnection delay on the client factory (which
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# is used to do exponential back off when the connection drops).
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#
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# Ideally we would reset the delay when we've "fully established" the
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# connection (for some definition thereof) to stop us from tightlooping
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# on reconnection if something fails after this point and we drop the
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# connection. Unfortunately, we don't really have a better definition of
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# "fully established" than the connection being established.
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if self._factory:
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self._factory.resetDelay()
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|
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# Tell the other end if we have any users currently syncing.
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currently_syncing = (
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self._presence_handler.get_currently_syncing_users_for_replication()
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)
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now = self._clock.time_msec()
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for user_id in currently_syncing:
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connection.send_command(
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UserSyncCommand(self._instance_id, user_id, True, now)
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)
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|
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def lost_connection(self, connection: AbstractConnection):
|
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"""Called when a connection is closed/lost.
|
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"""
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# we no longer need _streams_by_connection for this connection.
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streams = self._streams_by_connection.pop(connection, None)
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if streams:
|
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logger.info(
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"Lost replication connection; streams now disconnected: %s", streams
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)
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try:
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self._connections.remove(connection)
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except ValueError:
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pass
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|
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def connected(self) -> bool:
|
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"""Do we have any replication connections open?
|
|
|
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Is used by e.g. `ReplicationStreamer` to no-op if nothing is connected.
|
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"""
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return bool(self._connections)
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|
|
def send_command(
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self, cmd: Command, ignore_conn: Optional[AbstractConnection] = None
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):
|
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"""Send a command to all connected connections.
|
|
|
|
Args:
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cmd
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ignore_conn: If set don't send command to the given connection.
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Used when relaying commands from one connection to all others.
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"""
|
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if self._connections:
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for connection in self._connections:
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if connection == ignore_conn:
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continue
|
|
|
|
try:
|
|
connection.send_command(cmd)
|
|
except Exception:
|
|
# We probably want to catch some types of exceptions here
|
|
# and log them as warnings (e.g. connection gone), but I
|
|
# can't find what those exception types they would be.
|
|
logger.exception(
|
|
"Failed to write command %s to connection %s",
|
|
cmd.NAME,
|
|
connection,
|
|
)
|
|
else:
|
|
logger.warning("Dropping command as not connected: %r", cmd.NAME)
|
|
|
|
def send_federation_ack(self, token: int):
|
|
"""Ack data for the federation stream. This allows the master to drop
|
|
data stored purely in memory.
|
|
"""
|
|
self.send_command(FederationAckCommand(self._instance_name, token))
|
|
|
|
def send_user_sync(
|
|
self, instance_id: str, user_id: str, is_syncing: bool, last_sync_ms: int
|
|
):
|
|
"""Poke the master that a user has started/stopped syncing.
|
|
"""
|
|
self.send_command(
|
|
UserSyncCommand(instance_id, user_id, is_syncing, last_sync_ms)
|
|
)
|
|
|
|
def send_remove_pusher(self, app_id: str, push_key: str, user_id: str):
|
|
"""Poke the master to remove a pusher for a user
|
|
"""
|
|
cmd = RemovePusherCommand(app_id, push_key, user_id)
|
|
self.send_command(cmd)
|
|
|
|
def send_user_ip(
|
|
self,
|
|
user_id: str,
|
|
access_token: str,
|
|
ip: str,
|
|
user_agent: str,
|
|
device_id: str,
|
|
last_seen: int,
|
|
):
|
|
"""Tell the master that the user made a request.
|
|
"""
|
|
cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen)
|
|
self.send_command(cmd)
|
|
|
|
def send_remote_server_up(self, server: str):
|
|
self.send_command(RemoteServerUpCommand(server))
|
|
|
|
def stream_update(self, stream_name: str, token: str, data: Any):
|
|
"""Called when a new update is available to stream to clients.
|
|
|
|
We need to check if the client is interested in the stream or not
|
|
"""
|
|
self.send_command(RdataCommand(stream_name, self._instance_name, token, data))
|
|
|
|
|
|
UpdateToken = TypeVar("UpdateToken")
|
|
UpdateRow = TypeVar("UpdateRow")
|
|
|
|
|
|
def _batch_updates(
|
|
updates: Iterable[Tuple[UpdateToken, UpdateRow]]
|
|
) -> Iterator[Tuple[UpdateToken, List[UpdateRow]]]:
|
|
"""Collect stream updates with the same token together
|
|
|
|
Given a series of updates returned by Stream.get_updates_since(), collects
|
|
the updates which share the same stream_id together.
|
|
|
|
For example:
|
|
|
|
[(1, a), (1, b), (2, c), (3, d), (3, e)]
|
|
|
|
becomes:
|
|
|
|
[
|
|
(1, [a, b]),
|
|
(2, [c]),
|
|
(3, [d, e]),
|
|
]
|
|
"""
|
|
|
|
update_iter = iter(updates)
|
|
|
|
first_update = next(update_iter, None)
|
|
if first_update is None:
|
|
# empty input
|
|
return
|
|
|
|
current_batch_token = first_update[0]
|
|
current_batch = [first_update[1]]
|
|
|
|
for token, row in update_iter:
|
|
if token != current_batch_token:
|
|
# different token to the previous row: flush the previous
|
|
# batch and start anew
|
|
yield current_batch_token, current_batch
|
|
current_batch_token = token
|
|
current_batch = []
|
|
|
|
current_batch.append(row)
|
|
|
|
# flush the final batch
|
|
yield current_batch_token, current_batch
|