280 lines
11 KiB
Python
280 lines
11 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2017 Vector Creations Ltd
|
|
# Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# 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.
|
|
|
|
import logging
|
|
from typing import Any, Callable, Dict, List, Optional, Set
|
|
|
|
from prometheus_client import Counter
|
|
|
|
from synapse.replication.tcp.client import ReplicationClientFactory
|
|
from synapse.replication.tcp.commands import (
|
|
Command,
|
|
FederationAckCommand,
|
|
InvalidateCacheCommand,
|
|
PositionCommand,
|
|
RdataCommand,
|
|
RemoteServerUpCommand,
|
|
RemovePusherCommand,
|
|
SyncCommand,
|
|
UserIpCommand,
|
|
UserSyncCommand,
|
|
)
|
|
from synapse.replication.tcp.streams import STREAMS_MAP, Stream
|
|
from synapse.util.async_helpers import Linearizer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
# number of updates received for each RDATA stream
|
|
inbound_rdata_count = Counter(
|
|
"synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"]
|
|
)
|
|
|
|
|
|
class ReplicationCommandHandler:
|
|
"""Handles incoming commands from replication as well as sending commands
|
|
back out to connections.
|
|
"""
|
|
|
|
def __init__(self, hs):
|
|
self._replication_data_handler = hs.get_replication_data_handler()
|
|
self._presence_handler = hs.get_presence_handler()
|
|
|
|
# Set of streams that we've caught up with.
|
|
self._streams_connected = set() # type: Set[str]
|
|
|
|
self._streams = {
|
|
stream.NAME: stream(hs) for stream in STREAMS_MAP.values()
|
|
} # type: Dict[str, Stream]
|
|
|
|
self._position_linearizer = Linearizer("replication_position")
|
|
|
|
# Map of stream to batched updates. See RdataCommand for info on how
|
|
# batching works.
|
|
self._pending_batches = {} # type: Dict[str, List[Any]]
|
|
|
|
# The factory used to create connections.
|
|
self._factory = None # type: Optional[ReplicationClientFactory]
|
|
|
|
# The current connection. None if we are currently (re)connecting
|
|
self._connection = None
|
|
|
|
def start_replication(self, hs):
|
|
"""Helper method to start a replication connection to the remote server
|
|
using TCP.
|
|
"""
|
|
client_name = hs.config.worker_name
|
|
self._factory = ReplicationClientFactory(hs, client_name, self)
|
|
host = hs.config.worker_replication_host
|
|
port = hs.config.worker_replication_port
|
|
hs.get_reactor().connectTCP(host, port, self._factory)
|
|
|
|
async def on_RDATA(self, cmd: RdataCommand):
|
|
stream_name = cmd.stream_name
|
|
inbound_rdata_count.labels(stream_name).inc()
|
|
|
|
try:
|
|
row = STREAMS_MAP[stream_name].parse_row(cmd.row)
|
|
except Exception:
|
|
logger.exception("Failed to parse RDATA: %r %r", stream_name, cmd.row)
|
|
raise
|
|
|
|
if cmd.token is None or stream_name not in self._streams_connected:
|
|
# I.e. either this is part of a batch of updates for this stream (in
|
|
# which case batch until we get an update for the stream with a non
|
|
# None token) or we're currently connecting so we queue up rows.
|
|
self._pending_batches.setdefault(stream_name, []).append(row)
|
|
else:
|
|
# Check if this is the last of a batch of updates
|
|
rows = self._pending_batches.pop(stream_name, [])
|
|
rows.append(row)
|
|
await self.on_rdata(stream_name, cmd.token, rows)
|
|
|
|
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.
|
|
|
|
Args:
|
|
stream_name: name of the replication stream for this batch of rows
|
|
token: stream token for this batch of rows
|
|
rows: a list of Stream.ROW_TYPE objects as returned by
|
|
Stream.parse_row.
|
|
"""
|
|
logger.debug("Received rdata %s -> %s", stream_name, token)
|
|
await self._replication_data_handler.on_rdata(stream_name, token, rows)
|
|
|
|
async def on_POSITION(self, cmd: PositionCommand):
|
|
stream = self._streams.get(cmd.stream_name)
|
|
if not stream:
|
|
logger.error("Got POSITION for unknown stream: %s", cmd.stream_name)
|
|
return
|
|
|
|
# We're about to go and catch up with the stream, so mark as connecting
|
|
# to stop RDATA being handled at the same time by removing stream from
|
|
# list of connected streams. We also clear any batched up RDATA from
|
|
# before we got the POSITION.
|
|
self._streams_connected.discard(cmd.stream_name)
|
|
self._pending_batches.clear()
|
|
|
|
# We protect catching up with a linearizer in case the replication
|
|
# connection reconnects under us.
|
|
with await self._position_linearizer.queue(cmd.stream_name):
|
|
# Find where we previously streamed up to.
|
|
current_token = self._replication_data_handler.get_streams_to_replicate().get(
|
|
cmd.stream_name
|
|
)
|
|
if current_token is None:
|
|
logger.warning(
|
|
"Got POSITION for stream we're not subscribed to: %s",
|
|
cmd.stream_name,
|
|
)
|
|
return
|
|
|
|
# Fetch all updates between then and now.
|
|
limited = True
|
|
while limited:
|
|
updates, current_token, limited = await stream.get_updates_since(
|
|
current_token, cmd.token
|
|
)
|
|
if updates:
|
|
await self.on_rdata(
|
|
cmd.stream_name,
|
|
current_token,
|
|
[stream.parse_row(update[1]) for update in updates],
|
|
)
|
|
|
|
# We've now caught up to position sent to us, notify handler.
|
|
await self._replication_data_handler.on_position(cmd.stream_name, cmd.token)
|
|
|
|
self._streams_connected.add(cmd.stream_name)
|
|
|
|
# Handle any RDATA that came in while we were catching up.
|
|
rows = self._pending_batches.pop(cmd.stream_name, [])
|
|
if rows:
|
|
# We need to make sure we filter out RDATA rows with a token less
|
|
# than what we've caught up to. This is slightly fiddly because of
|
|
# "batched" rows which have a `None` token, indicating that they
|
|
# have the same token as the next row with a non-None token.
|
|
#
|
|
# We do this by walking the list backwards, first removing any RDATA
|
|
# rows that are part of an uncompeted batch, then taking rows while
|
|
# their token is either None or greater than where we've caught up
|
|
# to.
|
|
uncompleted_batch = []
|
|
unfinished_batch = True
|
|
filtered_rows = []
|
|
for row in reversed(rows):
|
|
if row.token is not None:
|
|
unfinished_batch = False
|
|
if cmd.token < row.token:
|
|
filtered_rows.append(row)
|
|
else:
|
|
break
|
|
elif unfinished_batch:
|
|
uncompleted_batch.append(row)
|
|
else:
|
|
filtered_rows.append(row)
|
|
|
|
filtered_rows.reverse()
|
|
uncompleted_batch.reverse()
|
|
if uncompleted_batch:
|
|
self._pending_batches[cmd.stream_name] = uncompleted_batch
|
|
|
|
await self.on_rdata(cmd.stream_name, rows[-1].token, filtered_rows)
|
|
|
|
async def on_SYNC(self, cmd: SyncCommand):
|
|
pass
|
|
|
|
async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand):
|
|
""""Called when get a new REMOTE_SERVER_UP command."""
|
|
self._replication_data_handler.on_remote_server_up(cmd.data)
|
|
|
|
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.
|
|
"""
|
|
return self._presence_handler.get_currently_syncing_users()
|
|
|
|
def update_connection(self, connection):
|
|
"""Called when a connection has been established (or lost with None).
|
|
"""
|
|
self._connection = connection
|
|
|
|
def finished_connecting(self):
|
|
"""Called when we have successfully subscribed and caught up to all
|
|
streams we're interested in.
|
|
"""
|
|
logger.info("Finished connecting to server")
|
|
|
|
# We don't reset the delay any earlier as otherwise if there is a
|
|
# problem during start up we'll end up tight looping connecting to the
|
|
# server.
|
|
if self._factory:
|
|
self._factory.resetDelay()
|
|
|
|
def send_command(self, cmd: Command):
|
|
"""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.warning("Dropping command as not connected: %r", cmd.NAME)
|
|
|
|
def send_federation_ack(self, token: int):
|
|
"""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, instance_id: str, user_id: str, is_syncing: bool, last_sync_ms: int
|
|
):
|
|
"""Poke the master that a user has started/stopped syncing.
|
|
"""
|
|
self.send_command(
|
|
UserSyncCommand(instance_id, user_id, is_syncing, last_sync_ms)
|
|
)
|
|
|
|
def send_remove_pusher(self, app_id: str, push_key: str, user_id: str):
|
|
"""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: Callable, keys: tuple):
|
|
"""Poke the master to invalidate a cache.
|
|
"""
|
|
cmd = InvalidateCacheCommand(cache_func.__name__, keys)
|
|
self.send_command(cmd)
|
|
|
|
def send_user_ip(
|
|
self,
|
|
user_id: str,
|
|
access_token: str,
|
|
ip: str,
|
|
user_agent: str,
|
|
device_id: str,
|
|
last_seen: int,
|
|
):
|
|
"""Tell the master that the user made a request.
|
|
"""
|
|
cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen)
|
|
self.send_command(cmd)
|
|
|
|
def send_remote_server_up(self, server: str):
|
|
self.send_command(RemoteServerUpCommand(server))
|