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233 lines
9.1 KiB
Python
233 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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# 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, 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.logging.context import PreserveLoggingContext, make_deferred_yieldable
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from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
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from synapse.replication.tcp.streams import TypingStream
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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, UserID
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from synapse.util.async_helpers import 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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# 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 = (
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{}
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) # type: Dict[str, List[Tuple[int, Deferred[None]]]]
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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 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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if 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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event = await self.store.get_event(
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row.data.event_id, allow_rejected=True
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)
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if event.rejected_reason:
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continue
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extra_users = () # type: Tuple[UserID, ...]
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if event.type == EventTypes.Member:
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extra_users = (UserID.from_string(event.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(
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event, event_pos, max_token, extra_users
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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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self.store.process_replication_rows(stream_name, instance_name, token, [])
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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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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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