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125 lines
4.5 KiB
Python
125 lines
4.5 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
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from twisted.internet.protocol import ReconnectingClientFactory
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from synapse.replication.slave.storage._base import BaseSlavedStore
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from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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from synapse.replication.tcp.handler import ReplicationCommandHandler
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logger = logging.getLogger(__name__)
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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, store: BaseSlavedStore):
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self.store = store
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async def on_rdata(self, stream_name: str, token: int, rows: list):
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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 (str): name of the replication stream for this batch of rows
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token (int): stream token for this batch of rows
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rows (list): 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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self.store.process_replication_rows(stream_name, token, rows)
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def get_streams_to_replicate(self) -> Dict[str, int]:
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"""Called when a new connection has been established and we need to
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subscribe to streams.
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Returns:
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map from stream name to the most recent update we have for
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that stream (ie, the point we want to start replicating from)
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"""
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args = self.store.stream_positions()
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user_account_data = args.pop("user_account_data", None)
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room_account_data = args.pop("room_account_data", None)
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if user_account_data:
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args["account_data"] = user_account_data
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elif room_account_data:
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args["account_data"] = room_account_data
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return args
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async def on_position(self, stream_name: str, token: int):
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self.store.process_replication_rows(stream_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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