456 lines
19 KiB
Python
456 lines
19 KiB
Python
# Copyright 2017 Vector Creations 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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"""A replication client for use by synapse workers.
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"""
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import logging
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from typing import TYPE_CHECKING, Dict, List, Optional, Set, Tuple
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from twisted.internet.defer import Deferred
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from twisted.internet.protocol import ReconnectingClientFactory
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from synapse.api.constants import EventTypes
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from synapse.federation import send_queue
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from synapse.federation.sender import FederationSender
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from synapse.logging.context import PreserveLoggingContext, make_deferred_yieldable
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
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from synapse.replication.tcp.streams import (
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AccountDataStream,
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DeviceListsStream,
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GroupServerStream,
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PushersStream,
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PushRulesStream,
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ReceiptsStream,
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TagAccountDataStream,
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ToDeviceStream,
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TypingStream,
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)
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from synapse.replication.tcp.streams.events import (
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EventsStream,
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EventsStreamEventRow,
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EventsStreamRow,
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)
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from synapse.types import PersistedEventPosition, ReadReceipt, UserID
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from synapse.util.async_helpers import Linearizer, timeout_deferred
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from synapse.util.metrics import Measure
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if TYPE_CHECKING:
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from synapse.replication.tcp.handler import ReplicationCommandHandler
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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# How long we allow callers to wait for replication updates before timing out.
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_WAIT_FOR_REPLICATION_TIMEOUT_SECONDS = 30
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class DirectTcpReplicationClientFactory(ReconnectingClientFactory):
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"""Factory for building connections to the master. Will reconnect if the
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connection is lost.
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Accepts a handler that is passed to `ClientReplicationStreamProtocol`.
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"""
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initialDelay = 0.1
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maxDelay = 1 # Try at least once every N seconds
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def __init__(
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self,
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hs: "HomeServer",
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client_name: str,
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command_handler: "ReplicationCommandHandler",
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):
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self.client_name = client_name
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self.command_handler = command_handler
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self.server_name = hs.config.server_name
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self.hs = hs
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self._clock = hs.get_clock() # As self.clock is defined in super class
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hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.stopTrying)
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def startedConnecting(self, connector):
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logger.info("Connecting to replication: %r", connector.getDestination())
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def buildProtocol(self, addr):
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logger.info("Connected to replication: %r", addr)
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return ClientReplicationStreamProtocol(
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self.hs,
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self.client_name,
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self.server_name,
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self._clock,
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self.command_handler,
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)
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def clientConnectionLost(self, connector, reason):
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logger.error("Lost replication conn: %r", reason)
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ReconnectingClientFactory.clientConnectionLost(self, connector, reason)
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def clientConnectionFailed(self, connector, reason):
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logger.error("Failed to connect to replication: %r", reason)
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ReconnectingClientFactory.clientConnectionFailed(self, connector, reason)
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class ReplicationDataHandler:
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"""Handles incoming stream updates from replication.
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This instance notifies the slave data store about updates. Can be subclassed
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to handle updates in additional ways.
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"""
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.notifier = hs.get_notifier()
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self._reactor = hs.get_reactor()
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self._clock = hs.get_clock()
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self._streams = hs.get_replication_streams()
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self._instance_name = hs.get_instance_name()
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self._typing_handler = hs.get_typing_handler()
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self._notify_pushers = hs.config.start_pushers
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self._pusher_pool = hs.get_pusherpool()
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self._presence_handler = hs.get_presence_handler()
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self.send_handler = None # type: Optional[FederationSenderHandler]
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if hs.should_send_federation():
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self.send_handler = FederationSenderHandler(hs)
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# Map from stream to list of deferreds waiting for the stream to
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# arrive at a particular position. The lists are sorted by stream position.
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self._streams_to_waiters = {} # type: Dict[str, List[Tuple[int, Deferred]]]
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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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By default this just pokes the slave store. Can be overridden in subclasses to
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handle more.
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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 Stream.parse_row.
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"""
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self.store.process_replication_rows(stream_name, instance_name, token, rows)
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if self.send_handler:
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await self.send_handler.process_replication_rows(stream_name, token, rows)
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if stream_name == TypingStream.NAME:
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self._typing_handler.process_replication_rows(token, rows)
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self.notifier.on_new_event(
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"typing_key", token, rooms=[row.room_id for row in rows]
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)
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elif stream_name == PushRulesStream.NAME:
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self.notifier.on_new_event(
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"push_rules_key", token, users=[row.user_id for row in rows]
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)
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elif stream_name in (AccountDataStream.NAME, TagAccountDataStream.NAME):
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self.notifier.on_new_event(
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"account_data_key", token, users=[row.user_id for row in rows]
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)
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elif stream_name == ReceiptsStream.NAME:
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self.notifier.on_new_event(
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"receipt_key", token, rooms=[row.room_id for row in rows]
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)
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await self._pusher_pool.on_new_receipts(
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token, token, {row.room_id for row in rows}
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)
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elif stream_name == ToDeviceStream.NAME:
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entities = [row.entity for row in rows if row.entity.startswith("@")]
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if entities:
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self.notifier.on_new_event("to_device_key", token, users=entities)
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elif stream_name == DeviceListsStream.NAME:
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all_room_ids = set() # type: Set[str]
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for row in rows:
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if row.entity.startswith("@"):
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room_ids = await self.store.get_rooms_for_user(row.entity)
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all_room_ids.update(room_ids)
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self.notifier.on_new_event("device_list_key", token, rooms=all_room_ids)
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elif stream_name == GroupServerStream.NAME:
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self.notifier.on_new_event(
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"groups_key", token, users=[row.user_id for row in rows]
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)
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elif stream_name == PushersStream.NAME:
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for row in rows:
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if row.deleted:
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self.stop_pusher(row.user_id, row.app_id, row.pushkey)
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else:
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await self.start_pusher(row.user_id, row.app_id, row.pushkey)
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elif stream_name == EventsStream.NAME:
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# We shouldn't get multiple rows per token for events stream, so
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# we don't need to optimise this for multiple rows.
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for row in rows:
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if row.type != EventsStreamEventRow.TypeId:
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continue
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assert isinstance(row, EventsStreamRow)
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assert isinstance(row.data, EventsStreamEventRow)
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if row.data.rejected:
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continue
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extra_users = () # type: Tuple[UserID, ...]
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if row.data.type == EventTypes.Member and row.data.state_key:
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extra_users = (UserID.from_string(row.data.state_key),)
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max_token = self.store.get_room_max_token()
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event_pos = PersistedEventPosition(instance_name, token)
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self.notifier.on_new_room_event_args(
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event_pos=event_pos,
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max_room_stream_token=max_token,
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extra_users=extra_users,
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room_id=row.data.room_id,
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event_type=row.data.type,
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state_key=row.data.state_key,
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membership=row.data.membership,
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)
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await self._presence_handler.process_replication_rows(
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stream_name, instance_name, token, rows
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)
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# Notify any waiting deferreds. The list is ordered by position so we
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# just iterate through the list until we reach a position that is
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# greater than the received row position.
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waiting_list = self._streams_to_waiters.get(stream_name, [])
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# Index of first item with a position after the current token, i.e we
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# have called all deferreds before this index. If not overwritten by
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# loop below means either a) no items in list so no-op or b) all items
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# in list were called and so the list should be cleared. Setting it to
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# `len(list)` works for both cases.
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index_of_first_deferred_not_called = len(waiting_list)
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for idx, (position, deferred) in enumerate(waiting_list):
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if position <= token:
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try:
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with PreserveLoggingContext():
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deferred.callback(None)
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except Exception:
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# The deferred has been cancelled or timed out.
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pass
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else:
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# The list is sorted by position so we don't need to continue
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# checking any further entries in the list.
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index_of_first_deferred_not_called = idx
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break
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# Drop all entries in the waiting list that were called in the above
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# loop. (This maintains the order so no need to resort)
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waiting_list[:] = waiting_list[index_of_first_deferred_not_called:]
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async def on_position(self, stream_name: str, instance_name: str, token: int):
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await self.on_rdata(stream_name, instance_name, token, [])
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# We poke the generic "replication" notifier to wake anything up that
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# may be streaming.
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self.notifier.notify_replication()
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def on_remote_server_up(self, server: str):
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"""Called when get a new REMOTE_SERVER_UP command."""
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# Let's wake up the transaction queue for the server in case we have
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# pending stuff to send to it.
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if self.send_handler:
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self.send_handler.wake_destination(server)
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async def wait_for_stream_position(
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self, instance_name: str, stream_name: str, position: int
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):
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"""Wait until this instance has received updates up to and including
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the given stream position.
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"""
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if instance_name == self._instance_name:
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# We don't get told about updates written by this process, and
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# anyway in that case we don't need to wait.
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return
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current_position = self._streams[stream_name].current_token(self._instance_name)
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if position <= current_position:
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# We're already past the position
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return
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# Create a new deferred that times out after N seconds, as we don't want
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# to wedge here forever.
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deferred = Deferred()
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deferred = timeout_deferred(
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deferred, _WAIT_FOR_REPLICATION_TIMEOUT_SECONDS, self._reactor
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)
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waiting_list = self._streams_to_waiters.setdefault(stream_name, [])
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waiting_list.append((position, deferred))
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waiting_list.sort(key=lambda t: t[0])
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# We measure here to get in flight counts and average waiting time.
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with Measure(self._clock, "repl.wait_for_stream_position"):
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logger.info("Waiting for repl stream %r to reach %s", stream_name, position)
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await make_deferred_yieldable(deferred)
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logger.info(
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"Finished waiting for repl stream %r to reach %s", stream_name, position
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)
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def stop_pusher(self, user_id, app_id, pushkey):
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if not self._notify_pushers:
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return
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key = "%s:%s" % (app_id, pushkey)
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pushers_for_user = self._pusher_pool.pushers.get(user_id, {})
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pusher = pushers_for_user.pop(key, None)
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if pusher is None:
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return
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logger.info("Stopping pusher %r / %r", user_id, key)
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pusher.on_stop()
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async def start_pusher(self, user_id, app_id, pushkey):
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if not self._notify_pushers:
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return
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key = "%s:%s" % (app_id, pushkey)
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logger.info("Starting pusher %r / %r", user_id, key)
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return await self._pusher_pool.start_pusher_by_id(app_id, pushkey, user_id)
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class FederationSenderHandler:
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"""Processes the fedration replication stream
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This class is only instantiate on the worker responsible for sending outbound
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federation transactions. It receives rows from the replication stream and forwards
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the appropriate entries to the FederationSender class.
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"""
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def __init__(self, hs: "HomeServer"):
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assert hs.should_send_federation()
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self.store = hs.get_datastore()
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self._is_mine_id = hs.is_mine_id
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self._hs = hs
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# We need to make a temporary value to ensure that mypy picks up the
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# right type. We know we should have a federation sender instance since
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# `should_send_federation` is True.
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sender = hs.get_federation_sender()
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assert isinstance(sender, FederationSender)
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self.federation_sender = sender
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# Stores the latest position in the federation stream we've gotten up
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# to. This is always set before we use it.
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self.federation_position = None # type: Optional[int]
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self._fed_position_linearizer = Linearizer(name="_fed_position_linearizer")
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def wake_destination(self, server: str):
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self.federation_sender.wake_destination(server)
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async def process_replication_rows(self, stream_name, token, rows):
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# The federation stream contains things that we want to send out, e.g.
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# presence, typing, etc.
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if stream_name == "federation":
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send_queue.process_rows_for_federation(self.federation_sender, rows)
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await self.update_token(token)
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# ... and when new receipts happen
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elif stream_name == ReceiptsStream.NAME:
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await self._on_new_receipts(rows)
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# ... as well as device updates and messages
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elif stream_name == DeviceListsStream.NAME:
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# The entities are either user IDs (starting with '@') whose devices
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# have changed, or remote servers that we need to tell about
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# changes.
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hosts = {row.entity for row in rows if not row.entity.startswith("@")}
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for host in hosts:
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self.federation_sender.send_device_messages(host)
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elif stream_name == ToDeviceStream.NAME:
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# The to_device stream includes stuff to be pushed to both local
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# clients and remote servers, so we ignore entities that start with
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# '@' (since they'll be local users rather than destinations).
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hosts = {row.entity for row in rows if not row.entity.startswith("@")}
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for host in hosts:
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self.federation_sender.send_device_messages(host)
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async def _on_new_receipts(self, rows):
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"""
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Args:
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rows (Iterable[synapse.replication.tcp.streams.ReceiptsStream.ReceiptsStreamRow]):
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new receipts to be processed
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"""
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for receipt in rows:
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# we only want to send on receipts for our own users
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if not self._is_mine_id(receipt.user_id):
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continue
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receipt_info = ReadReceipt(
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receipt.room_id,
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receipt.receipt_type,
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receipt.user_id,
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[receipt.event_id],
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receipt.data,
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)
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await self.federation_sender.send_read_receipt(receipt_info)
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async def update_token(self, token):
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"""Update the record of where we have processed to in the federation stream.
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Called after we have processed a an update received over replication. Sends
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a FEDERATION_ACK back to the master, and stores the token that we have processed
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in `federation_stream_position` so that we can restart where we left off.
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"""
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self.federation_position = token
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# We save and send the ACK to master asynchronously, so we don't block
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# processing on persistence. We don't need to do this operation for
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# every single RDATA we receive, we just need to do it periodically.
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if self._fed_position_linearizer.is_queued(None):
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# There is already a task queued up to save and send the token, so
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# no need to queue up another task.
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return
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run_as_background_process("_save_and_send_ack", self._save_and_send_ack)
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async def _save_and_send_ack(self):
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"""Save the current federation position in the database and send an ACK
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to master with where we're up to.
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"""
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# We should only be calling this once we've got a token.
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assert self.federation_position is not None
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try:
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# We linearize here to ensure we don't have races updating the token
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#
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# XXX this appears to be redundant, since the ReplicationCommandHandler
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# has a linearizer which ensures that we only process one line of
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# replication data at a time. Should we remove it, or is it doing useful
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# service for robustness? Or could we replace it with an assertion that
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# we're not being re-entered?
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with (await self._fed_position_linearizer.queue(None)):
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# We persist and ack the same position, so we take a copy of it
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# here as otherwise it can get modified from underneath us.
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current_position = self.federation_position
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await self.store.update_federation_out_pos(
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"federation", current_position
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)
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# We ACK this token over replication so that the master can drop
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# its in memory queues
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self._hs.get_tcp_replication().send_federation_ack(current_position)
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except Exception:
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logger.exception("Error updating federation stream position")
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