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230 lines
8.1 KiB
Python
230 lines
8.1 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 twisted.internet import defer
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from twisted.internet.protocol import ReconnectingClientFactory
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from .commands import (
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FederationAckCommand,
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InvalidateCacheCommand,
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RemovePusherCommand,
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UserIpCommand,
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UserSyncCommand,
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)
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from .protocol import ClientReplicationStreamProtocol
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logger = logging.getLogger(__name__)
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class ReplicationClientFactory(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 will be called when new data is available or data
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is required.
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"""
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maxDelay = 30 # Try at least once every N seconds
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def __init__(self, hs, client_name, handler):
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self.client_name = client_name
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self.handler = handler
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self.server_name = hs.config.server_name
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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.client_name, self.server_name, self._clock, self.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(
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self, connector, reason
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)
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class ReplicationClientHandler(object):
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"""A base handler that can be passed to the ReplicationClientFactory.
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By default proxies incoming replication data to the SlaveStore.
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"""
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def __init__(self, store):
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self.store = store
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# The current connection. None if we are currently (re)connecting
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self.connection = None
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# Any pending commands to be sent once a new connection has been
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# established
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self.pending_commands = []
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# Map from string -> deferred, to wake up when receiveing a SYNC with
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# the given string.
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# Used for tests.
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self.awaiting_syncs = {}
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# The factory used to create connections.
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self.factory = None
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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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client_name = hs.config.worker_name
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self.factory = ReplicationClientFactory(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 on_rdata(self, stream_name, token, rows):
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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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Returns:
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Deferred|None
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"""
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logger.debug("Received rdata %s -> %s", stream_name, token)
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return self.store.process_replication_rows(stream_name, token, rows)
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def on_position(self, stream_name, token):
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"""Called when we get new position data. By default this just pokes
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the slave store.
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Can be overriden in subclasses to handle more.
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"""
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return self.store.process_replication_rows(stream_name, token, [])
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def on_sync(self, data):
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"""When we received a SYNC we wake up any deferreds that were waiting
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for the sync with the given data.
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Used by tests.
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"""
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d = self.awaiting_syncs.pop(data, None)
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if d:
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d.callback(data)
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def get_streams_to_replicate(self):
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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 a dictionary of stream name to token.
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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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def get_currently_syncing_users(self):
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"""Get the list of currently syncing users (if any). This is called
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when a connection has been established and we need to send the
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currently syncing users. (Overriden by the synchrotron's only)
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"""
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return []
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def send_command(self, cmd):
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"""Send a command to master (when we get establish a connection if we
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don't have one already.)
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"""
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if self.connection:
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self.connection.send_command(cmd)
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else:
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logger.warn("Queuing command as not connected: %r", cmd.NAME)
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self.pending_commands.append(cmd)
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def send_federation_ack(self, token):
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"""Ack data for the federation stream. This allows the master to drop
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data stored purely in memory.
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"""
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self.send_command(FederationAckCommand(token))
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def send_user_sync(self, user_id, is_syncing, last_sync_ms):
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"""Poke the master that a user has started/stopped syncing.
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"""
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self.send_command(UserSyncCommand(user_id, is_syncing, last_sync_ms))
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def send_remove_pusher(self, app_id, push_key, user_id):
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"""Poke the master to remove a pusher for a user
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"""
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cmd = RemovePusherCommand(app_id, push_key, user_id)
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self.send_command(cmd)
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def send_invalidate_cache(self, cache_func, keys):
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"""Poke the master to invalidate a cache.
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"""
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cmd = InvalidateCacheCommand(cache_func.__name__, keys)
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self.send_command(cmd)
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def send_user_ip(self, user_id, access_token, ip, user_agent, device_id, last_seen):
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"""Tell the master that the user made a request.
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"""
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cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen)
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self.send_command(cmd)
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def await_sync(self, data):
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"""Returns a deferred that is resolved when we receive a SYNC command
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with given data.
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[Not currently] used by tests.
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"""
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return self.awaiting_syncs.setdefault(data, defer.Deferred())
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def update_connection(self, connection):
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"""Called when a connection has been established (or lost with None).
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"""
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self.connection = connection
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if connection:
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for cmd in self.pending_commands:
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connection.send_command(cmd)
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self.pending_commands = []
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def finished_connecting(self):
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"""Called when we have successfully subscribed and caught up to all
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streams we're interested in.
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"""
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logger.info("Finished connecting to server")
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# We don't reset the delay any earlier as otherwise if there is a
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# problem during start up we'll end up tight looping connecting to the
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# server.
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self.factory.resetDelay()
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