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`__str__` depended on `self.addr`, which was absent from ClientReplicationStreamProtocol, so attempting to call str on such an object would raise an exception. We can calculate the peer addr from the transport, so there is no need for addr anyway.
329 lines
12 KiB
Python
329 lines
12 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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"""The server side of the replication stream.
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"""
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import logging
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import random
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from six import itervalues
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from prometheus_client import Counter
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from twisted.internet import defer
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from twisted.internet.protocol import Factory
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from synapse.metrics import LaterGauge
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.metrics import Measure, measure_func
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from .protocol import ServerReplicationStreamProtocol
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from .streams import STREAMS_MAP, FederationStream
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stream_updates_counter = Counter("synapse_replication_tcp_resource_stream_updates",
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"", ["stream_name"])
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user_sync_counter = Counter("synapse_replication_tcp_resource_user_sync", "")
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federation_ack_counter = Counter("synapse_replication_tcp_resource_federation_ack", "")
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remove_pusher_counter = Counter("synapse_replication_tcp_resource_remove_pusher", "")
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invalidate_cache_counter = Counter("synapse_replication_tcp_resource_invalidate_cache",
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"")
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user_ip_cache_counter = Counter("synapse_replication_tcp_resource_user_ip_cache", "")
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logger = logging.getLogger(__name__)
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class ReplicationStreamProtocolFactory(Factory):
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"""Factory for new replication connections.
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"""
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def __init__(self, hs):
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self.streamer = ReplicationStreamer(hs)
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self.clock = hs.get_clock()
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self.server_name = hs.config.server_name
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def buildProtocol(self, addr):
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return ServerReplicationStreamProtocol(
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self.server_name,
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self.clock,
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self.streamer,
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)
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class ReplicationStreamer(object):
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"""Handles replication connections.
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This needs to be poked when new replication data may be available. When new
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data is available it will propagate to all connected clients.
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"""
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def __init__(self, hs):
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self.store = hs.get_datastore()
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self.presence_handler = hs.get_presence_handler()
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self.clock = hs.get_clock()
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self.notifier = hs.get_notifier()
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self._server_notices_sender = hs.get_server_notices_sender()
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self._replication_torture_level = hs.config.replication_torture_level
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# Current connections.
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self.connections = []
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LaterGauge("synapse_replication_tcp_resource_total_connections", "", [],
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lambda: len(self.connections))
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# List of streams that clients can subscribe to.
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# We only support federation stream if federation sending hase been
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# disabled on the master.
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self.streams = [
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stream(hs) for stream in itervalues(STREAMS_MAP)
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if stream != FederationStream or not hs.config.send_federation
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]
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self.streams_by_name = {stream.NAME: stream for stream in self.streams}
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LaterGauge(
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"synapse_replication_tcp_resource_connections_per_stream", "",
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["stream_name"],
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lambda: {
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(stream_name,): len([
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conn for conn in self.connections
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if stream_name in conn.replication_streams
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])
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for stream_name in self.streams_by_name
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})
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self.federation_sender = None
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if not hs.config.send_federation:
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self.federation_sender = hs.get_federation_sender()
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self.notifier.add_replication_callback(self.on_notifier_poke)
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# Keeps track of whether we are currently checking for updates
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self.is_looping = False
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self.pending_updates = False
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hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.on_shutdown)
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def on_shutdown(self):
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# close all connections on shutdown
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for conn in self.connections:
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conn.send_error("server shutting down")
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def on_notifier_poke(self):
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"""Checks if there is actually any new data and sends it to the
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connections if there are.
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This should get called each time new data is available, even if it
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is currently being executed, so that nothing gets missed
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"""
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if not self.connections:
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# Don't bother if nothing is listening. We still need to advance
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# the stream tokens otherwise they'll fall beihind forever
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for stream in self.streams:
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stream.discard_updates_and_advance()
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return
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self.pending_updates = True
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if self.is_looping:
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logger.debug("Notifier poke loop already running")
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return
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run_as_background_process("replication_notifier", self._run_notifier_loop)
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@defer.inlineCallbacks
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def _run_notifier_loop(self):
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self.is_looping = True
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try:
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# Keep looping while there have been pokes about potential updates.
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# This protects against the race where a stream we already checked
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# gets an update while we're handling other streams.
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while self.pending_updates:
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self.pending_updates = False
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with Measure(self.clock, "repl.stream.get_updates"):
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# First we tell the streams that they should update their
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# current tokens.
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for stream in self.streams:
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stream.advance_current_token()
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all_streams = self.streams
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if self._replication_torture_level is not None:
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# there is no guarantee about ordering between the streams,
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# so let's shuffle them around a bit when we are in torture mode.
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all_streams = list(all_streams)
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random.shuffle(all_streams)
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for stream in all_streams:
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if stream.last_token == stream.upto_token:
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continue
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if self._replication_torture_level:
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yield self.clock.sleep(
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self._replication_torture_level / 1000.0
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)
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logger.debug(
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"Getting stream: %s: %s -> %s",
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stream.NAME, stream.last_token, stream.upto_token
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)
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try:
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updates, current_token = yield stream.get_updates()
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except Exception:
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logger.info("Failed to handle stream %s", stream.NAME)
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raise
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logger.debug(
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"Sending %d updates to %d connections",
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len(updates), len(self.connections),
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)
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if updates:
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logger.info(
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"Streaming: %s -> %s", stream.NAME, updates[-1][0]
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)
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stream_updates_counter.labels(stream.NAME).inc(len(updates))
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# Some streams return multiple rows with the same stream IDs,
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# we need to make sure they get sent out in batches. We do
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# this by setting the current token to all but the last of
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# a series of updates with the same token to have a None
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# token. See RdataCommand for more details.
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batched_updates = _batch_updates(updates)
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for conn in self.connections:
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for token, row in batched_updates:
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try:
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conn.stream_update(stream.NAME, token, row)
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except Exception:
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logger.exception("Failed to replicate")
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logger.debug("No more pending updates, breaking poke loop")
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finally:
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self.pending_updates = False
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self.is_looping = False
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@measure_func("repl.get_stream_updates")
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def get_stream_updates(self, stream_name, token):
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"""For a given stream get all updates since token. This is called when
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a client first subscribes to a stream.
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"""
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stream = self.streams_by_name.get(stream_name, None)
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if not stream:
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raise Exception("unknown stream %s", stream_name)
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return stream.get_updates_since(token)
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@measure_func("repl.federation_ack")
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def federation_ack(self, token):
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"""We've received an ack for federation stream from a client.
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"""
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federation_ack_counter.inc()
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if self.federation_sender:
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self.federation_sender.federation_ack(token)
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@measure_func("repl.on_user_sync")
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@defer.inlineCallbacks
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def on_user_sync(self, conn_id, user_id, is_syncing, last_sync_ms):
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"""A client has started/stopped syncing on a worker.
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"""
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user_sync_counter.inc()
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yield self.presence_handler.update_external_syncs_row(
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conn_id, user_id, is_syncing, last_sync_ms,
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)
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@measure_func("repl.on_remove_pusher")
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@defer.inlineCallbacks
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def on_remove_pusher(self, app_id, push_key, user_id):
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"""A client has asked us to remove a pusher
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"""
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remove_pusher_counter.inc()
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yield self.store.delete_pusher_by_app_id_pushkey_user_id(
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app_id=app_id, pushkey=push_key, user_id=user_id
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)
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self.notifier.on_new_replication_data()
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@measure_func("repl.on_invalidate_cache")
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def on_invalidate_cache(self, cache_func, keys):
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"""The client has asked us to invalidate a cache
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"""
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invalidate_cache_counter.inc()
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getattr(self.store, cache_func).invalidate(tuple(keys))
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@measure_func("repl.on_user_ip")
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@defer.inlineCallbacks
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def on_user_ip(self, user_id, access_token, ip, user_agent, device_id, last_seen):
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"""The client saw a user request
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"""
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user_ip_cache_counter.inc()
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yield self.store.insert_client_ip(
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user_id, access_token, ip, user_agent, device_id, last_seen,
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)
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yield self._server_notices_sender.on_user_ip(user_id)
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def send_sync_to_all_connections(self, data):
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"""Sends a SYNC command to all clients.
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Used in tests.
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"""
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for conn in self.connections:
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conn.send_sync(data)
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def new_connection(self, connection):
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"""A new client connection has been established
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"""
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self.connections.append(connection)
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def lost_connection(self, connection):
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"""A client connection has been lost
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"""
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try:
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self.connections.remove(connection)
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except ValueError:
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pass
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# We need to tell the presence handler that the connection has been
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# lost so that it can handle any ongoing syncs on that connection.
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self.presence_handler.update_external_syncs_clear(connection.conn_id)
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def _batch_updates(updates):
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"""Takes a list of updates of form [(token, row)] and sets the token to
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None for all rows where the next row has the same token. This is used to
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implement batching.
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For example:
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[(1, _), (1, _), (2, _), (3, _), (3, _)]
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becomes:
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[(None, _), (1, _), (2, _), (None, _), (3, _)]
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"""
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if not updates:
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return []
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new_updates = []
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for i, update in enumerate(updates[:-1]):
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if update[0] == updates[i + 1][0]:
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new_updates.append((None, update[1]))
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else:
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new_updates.append(update)
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new_updates.append(updates[-1])
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return new_updates
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