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# -*- 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.
"""
from twisted.internet import reactor, defer
from twisted.internet.protocol import ReconnectingClientFactory
from .commands import (
FederationAckCommand, UserSyncCommand, RemovePusherCommand, InvalidateCacheCommand,
)
from .protocol import ClientReplicationStreamProtocol
import logging
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 will be called when new data is available or data
is required.
"""
maxDelay = 5 # Try at least once every N seconds
def __init__(self, hs, client_name, handler):
self.client_name = client_name
self.handler = handler
self.server_name = hs.config.server_name
self._clock = hs.get_clock() # As self.clock is defined in super class
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)
self.resetDelay()
return ClientReplicationStreamProtocol(
self.client_name, self.server_name, self._clock, self.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 ReplicationClientHandler(object):
"""A base handler that can be passed to the ReplicationClientFactory.
By default proxies incoming replication data to the SlaveStore.
"""
def __init__(self, store):
self.store = store
# The current connection. None if we are currently (re)connecting
self.connection = None
# Any pending commands to be sent once a new connection has been
# established
self.pending_commands = []
# Map from string -> deferred, to wake up when receiveing a SYNC with
# the given string.
# Used for tests.
self.awaiting_syncs = {}
def start_replication(self, hs):
"""Helper method to start a replication connection to the remote server
using TCP.
"""
client_name = hs.config.worker_name
factory = ReplicationClientFactory(hs, client_name, self)
host = hs.config.worker_replication_host
port = hs.config.worker_replication_port
reactor.connectTCP(host, port, factory)
def on_rdata(self, stream_name, token, rows):
"""Called when we get new replication data. By default this just pokes
the slave store.
Can be overriden in subclasses to handle more.
"""
logger.info("Received rdata %s -> %s", stream_name, token)
self.store.process_replication_rows(stream_name, token, rows)
def on_position(self, stream_name, token):
"""Called when we get new position data. By default this just pokes
the slave store.
Can be overriden in subclasses to handle more.
"""
self.store.process_replication_rows(stream_name, token, [])
def on_sync(self, data):
"""When we received a SYNC we wake up any deferreds that were waiting
for the sync with the given data.
Used by tests.
"""
d = self.awaiting_syncs.pop(data, None)
if d:
d.callback(data)
def get_streams_to_replicate(self):
"""Called when a new connection has been established and we need to
subscribe to streams.
Returns a dictionary of stream name to token.
"""
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
def get_currently_syncing_users(self):
"""Get the list of currently syncing users (if any). This is called
when a connection has been established and we need to send the
currently syncing users. (Overriden by the synchrotron's only)
"""
return []
def send_command(self, cmd):
"""Send a command to master (when we get establish a connection if we
don't have one already.)
"""
if self.connection:
self.connection.send_command(cmd)
else:
logger.warn("Queuing command as not connected: %r", cmd.NAME)
self.pending_commands.append(cmd)
def send_federation_ack(self, token):
"""Ack data for the federation stream. This allows the master to drop
data stored purely in memory.
"""
self.send_command(FederationAckCommand(token))
def send_user_sync(self, user_id, is_syncing, last_sync_ms):
"""Poke the master that a user has started/stopped syncing.
"""
self.send_command(UserSyncCommand(user_id, is_syncing, last_sync_ms))
def send_remove_pusher(self, app_id, push_key, user_id):
"""Poke the master to remove a pusher for a user
"""
cmd = RemovePusherCommand(app_id, push_key, user_id)
self.send_command(cmd)
def send_invalidate_cache(self, cache_func, keys):
"""Poke the master to invalidate a cache.
"""
cmd = InvalidateCacheCommand(cache_func, keys)
self.send_command(cmd)
def await_sync(self, data):
"""Returns a deferred that is resolved when we receive a SYNC command
with given data.
Used by tests.
"""
return self.awaiting_syncs.setdefault(data, defer.Deferred())
def update_connection(self, connection):
"""Called when a connection has been established (or lost with None).
"""
self.connection = connection
if connection:
for cmd in self.pending_commands:
connection.send_command(cmd)
self.pending_commands = []
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