forked-synapse/synapse/replication/tcp/client.py
Erik Johnston 5016b162fc
Move client command handling out of TCP protocol (#7185)
The aim here is to move the command handling out of the TCP protocol classes and to also merge the client and server command handling (so that we can reuse them for redis protocol). This PR simply moves the client paths to the new `ReplicationCommandHandler`, a future PR will move the server paths too.
2020-04-06 09:58:42 +01:00

125 lines
4.5 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""A replication client for use by synapse workers.
"""
import logging
from typing import TYPE_CHECKING, Dict
from twisted.internet.protocol import ReconnectingClientFactory
from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
if TYPE_CHECKING:
from synapse.server import HomeServer
from synapse.replication.tcp.handler import ReplicationCommandHandler
logger = logging.getLogger(__name__)
class ReplicationClientFactory(ReconnectingClientFactory):
"""Factory for building connections to the master. Will reconnect if the
connection is lost.
Accepts a handler that is passed to `ClientReplicationStreamProtocol`.
"""
initialDelay = 0.1
maxDelay = 1 # Try at least once every N seconds
def __init__(
self,
hs: "HomeServer",
client_name: str,
command_handler: "ReplicationCommandHandler",
):
self.client_name = client_name
self.command_handler = command_handler
self.server_name = hs.config.server_name
self.hs = hs
self._clock = hs.get_clock() # As self.clock is defined in super class
hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.stopTrying)
def startedConnecting(self, connector):
logger.info("Connecting to replication: %r", connector.getDestination())
def buildProtocol(self, addr):
logger.info("Connected to replication: %r", addr)
return ClientReplicationStreamProtocol(
self.hs,
self.client_name,
self.server_name,
self._clock,
self.command_handler,
)
def clientConnectionLost(self, connector, reason):
logger.error("Lost replication conn: %r", reason)
ReconnectingClientFactory.clientConnectionLost(self, connector, reason)
def clientConnectionFailed(self, connector, reason):
logger.error("Failed to connect to replication: %r", reason)
ReconnectingClientFactory.clientConnectionFailed(self, connector, reason)
class ReplicationDataHandler:
"""Handles incoming stream updates from replication.
This instance notifies the slave data store about updates. Can be subclassed
to handle updates in additional ways.
"""
def __init__(self, store: BaseSlavedStore):
self.store = store
async def on_rdata(self, stream_name: str, token: int, rows: list):
"""Called to handle a batch of replication data with a given stream token.
By default this just pokes the slave store. Can be overridden in subclasses to
handle more.
Args:
stream_name (str): name of the replication stream for this batch of rows
token (int): stream token for this batch of rows
rows (list): a list of Stream.ROW_TYPE objects as returned by
Stream.parse_row.
"""
self.store.process_replication_rows(stream_name, token, rows)
def get_streams_to_replicate(self) -> Dict[str, int]:
"""Called when a new connection has been established and we need to
subscribe to streams.
Returns:
map from stream name to the most recent update we have for
that stream (ie, the point we want to start replicating from)
"""
args = self.store.stream_positions()
user_account_data = args.pop("user_account_data", None)
room_account_data = args.pop("room_account_data", None)
if user_account_data:
args["account_data"] = user_account_data
elif room_account_data:
args["account_data"] = room_account_data
return args
async def on_position(self, stream_name: str, token: int):
self.store.process_replication_rows(stream_name, token, [])
def on_remote_server_up(self, server: str):
"""Called when get a new REMOTE_SERVER_UP command."""