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![Richard van der Hoff](/assets/img/avatar_default.png)
Run the handlers for replication commands as background processes. This should improve the visibility in our metrics, and reduce the number of "running db transaction from sentinel context" warnings. Ideally it means converting the things that fire off deferreds into the night into things that actually return a Deferred when they are done. I've made a bit of a stab at this, but it will probably be leaky.
680 lines
23 KiB
Python
680 lines
23 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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"""This module contains the implementation of both the client and server
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protocols.
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The basic structure of the protocol is line based, where the initial word of
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each line specifies the command. The rest of the line is parsed based on the
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command. For example, the `RDATA` command is defined as::
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RDATA <stream_name> <token> <row_json>
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(Note that `<row_json>` may contains spaces, but cannot contain newlines.)
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Blank lines are ignored.
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# Example
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An example iteraction is shown below. Each line is prefixed with '>' or '<' to
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indicate which side is sending, these are *not* included on the wire::
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* connection established *
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> SERVER localhost:8823
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> PING 1490197665618
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< NAME synapse.app.appservice
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< PING 1490197665618
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< REPLICATE events 1
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< REPLICATE backfill 1
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< REPLICATE caches 1
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> POSITION events 1
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> POSITION backfill 1
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> POSITION caches 1
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> RDATA caches 2 ["get_user_by_id",["@01register-user:localhost:8823"],1490197670513]
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> RDATA events 14 ["$149019767112vOHxz:localhost:8823",
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"!AFDCvgApUmpdfVjIXm:localhost:8823","m.room.guest_access","",null]
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< PING 1490197675618
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> ERROR server stopping
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* connection closed by server *
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"""
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import fcntl
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import logging
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import struct
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from collections import defaultdict
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from six import iteritems, iterkeys
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from prometheus_client import Counter
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from twisted.internet import defer
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from twisted.protocols.basic import LineOnlyReceiver
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from twisted.python.failure import Failure
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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.logcontext import make_deferred_yieldable, run_in_background
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from synapse.util.stringutils import random_string
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from .commands import (
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COMMAND_MAP,
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VALID_CLIENT_COMMANDS,
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VALID_SERVER_COMMANDS,
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ErrorCommand,
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NameCommand,
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PingCommand,
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PositionCommand,
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RdataCommand,
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ReplicateCommand,
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ServerCommand,
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SyncCommand,
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UserSyncCommand,
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)
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from .streams import STREAMS_MAP
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connection_close_counter = Counter(
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"synapse_replication_tcp_protocol_close_reason", "", ["reason_type"])
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# A list of all connected protocols. This allows us to send metrics about the
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# connections.
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connected_connections = []
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logger = logging.getLogger(__name__)
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PING_TIME = 5000
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PING_TIMEOUT_MULTIPLIER = 5
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PING_TIMEOUT_MS = PING_TIME * PING_TIMEOUT_MULTIPLIER
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class ConnectionStates(object):
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CONNECTING = "connecting"
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ESTABLISHED = "established"
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PAUSED = "paused"
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CLOSED = "closed"
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class BaseReplicationStreamProtocol(LineOnlyReceiver):
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"""Base replication protocol shared between client and server.
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Reads lines (ignoring blank ones) and parses them into command classes,
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asserting that they are valid for the given direction, i.e. server commands
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are only sent by the server.
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On receiving a new command it calls `on_<COMMAND_NAME>` with the parsed
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command.
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It also sends `PING` periodically, and correctly times out remote connections
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(if they send a `PING` command)
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"""
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delimiter = b'\n'
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VALID_INBOUND_COMMANDS = [] # Valid commands we expect to receive
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VALID_OUTBOUND_COMMANDS = [] # Valid commans we can send
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max_line_buffer = 10000
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def __init__(self, clock):
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self.clock = clock
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self.last_received_command = self.clock.time_msec()
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self.last_sent_command = 0
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self.time_we_closed = None # When we requested the connection be closed
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self.received_ping = False # Have we reecived a ping from the other side
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self.state = ConnectionStates.CONNECTING
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self.name = "anon" # The name sent by a client.
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self.conn_id = random_string(5) # To dedupe in case of name clashes.
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# List of pending commands to send once we've established the connection
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self.pending_commands = []
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# The LoopingCall for sending pings.
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self._send_ping_loop = None
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self.inbound_commands_counter = defaultdict(int)
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self.outbound_commands_counter = defaultdict(int)
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def connectionMade(self):
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logger.info("[%s] Connection established", self.id())
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self.state = ConnectionStates.ESTABLISHED
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connected_connections.append(self) # Register connection for metrics
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self.transport.registerProducer(self, True) # For the *Producing callbacks
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self._send_pending_commands()
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# Starts sending pings
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self._send_ping_loop = self.clock.looping_call(self.send_ping, 5000)
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# Always send the initial PING so that the other side knows that they
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# can time us out.
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self.send_command(PingCommand(self.clock.time_msec()))
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def send_ping(self):
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"""Periodically sends a ping and checks if we should close the connection
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due to the other side timing out.
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"""
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now = self.clock.time_msec()
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if self.time_we_closed:
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if now - self.time_we_closed > PING_TIMEOUT_MS:
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logger.info(
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"[%s] Failed to close connection gracefully, aborting", self.id()
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)
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self.transport.abortConnection()
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else:
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if now - self.last_sent_command >= PING_TIME:
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self.send_command(PingCommand(now))
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if self.received_ping and now - self.last_received_command > PING_TIMEOUT_MS:
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logger.info(
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"[%s] Connection hasn't received command in %r ms. Closing.",
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self.id(), now - self.last_received_command
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)
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self.send_error("ping timeout")
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def lineReceived(self, line):
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"""Called when we've received a line
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"""
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if line.strip() == "":
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# Ignore blank lines
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return
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line = line.decode("utf-8")
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cmd_name, rest_of_line = line.split(" ", 1)
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if cmd_name not in self.VALID_INBOUND_COMMANDS:
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logger.error("[%s] invalid command %s", self.id(), cmd_name)
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self.send_error("invalid command: %s", cmd_name)
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return
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self.last_received_command = self.clock.time_msec()
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self.inbound_commands_counter[cmd_name] = (
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self.inbound_commands_counter[cmd_name] + 1)
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cmd_cls = COMMAND_MAP[cmd_name]
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try:
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cmd = cmd_cls.from_line(rest_of_line)
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except Exception as e:
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logger.exception(
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"[%s] failed to parse line %r: %r", self.id(), cmd_name, rest_of_line
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)
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self.send_error(
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"failed to parse line for %r: %r (%r):" % (cmd_name, e, rest_of_line)
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)
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return
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# Now lets try and call on_<CMD_NAME> function
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try:
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run_as_background_process(
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"replication-" + cmd.get_logcontext_id(),
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getattr(self, "on_%s" % (cmd_name,)),
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cmd,
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)
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except Exception:
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logger.exception("[%s] Failed to handle line: %r", self.id(), line)
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def close(self):
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logger.warn("[%s] Closing connection", self.id())
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self.time_we_closed = self.clock.time_msec()
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self.transport.loseConnection()
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self.on_connection_closed()
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def send_error(self, error_string, *args):
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"""Send an error to remote and close the connection.
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"""
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self.send_command(ErrorCommand(error_string % args))
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self.close()
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def send_command(self, cmd, do_buffer=True):
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"""Send a command if connection has been established.
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Args:
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cmd (Command)
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do_buffer (bool): Whether to buffer the message or always attempt
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to send the command. This is mostly used to send an error
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message if we're about to close the connection due our buffers
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becoming full.
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"""
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if self.state == ConnectionStates.CLOSED:
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logger.debug("[%s] Not sending, connection closed", self.id())
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return
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if do_buffer and self.state != ConnectionStates.ESTABLISHED:
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self._queue_command(cmd)
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return
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self.outbound_commands_counter[cmd.NAME] = (
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self.outbound_commands_counter[cmd.NAME] + 1)
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string = "%s %s" % (cmd.NAME, cmd.to_line(),)
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if "\n" in string:
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raise Exception("Unexpected newline in command: %r", string)
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self.sendLine(string.encode("utf-8"))
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self.last_sent_command = self.clock.time_msec()
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def _queue_command(self, cmd):
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"""Queue the command until the connection is ready to write to again.
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"""
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logger.debug("[%s] Queing as conn %r, cmd: %r", self.id(), self.state, cmd)
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self.pending_commands.append(cmd)
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if len(self.pending_commands) > self.max_line_buffer:
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# The other side is failing to keep up and out buffers are becoming
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# full, so lets close the connection.
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# XXX: should we squawk more loudly?
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logger.error("[%s] Remote failed to keep up", self.id())
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self.send_command(ErrorCommand("Failed to keep up"), do_buffer=False)
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self.close()
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def _send_pending_commands(self):
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"""Send any queued commandes
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"""
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pending = self.pending_commands
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self.pending_commands = []
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for cmd in pending:
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self.send_command(cmd)
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def on_PING(self, line):
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self.received_ping = True
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def on_ERROR(self, cmd):
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logger.error("[%s] Remote reported error: %r", self.id(), cmd.data)
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def pauseProducing(self):
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"""This is called when both the kernel send buffer and the twisted
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tcp connection send buffers have become full.
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We don't actually have any control over those sizes, so we buffer some
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commands ourselves before knifing the connection due to the remote
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failing to keep up.
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"""
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logger.info("[%s] Pause producing", self.id())
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self.state = ConnectionStates.PAUSED
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def resumeProducing(self):
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"""The remote has caught up after we started buffering!
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"""
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logger.info("[%s] Resume producing", self.id())
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self.state = ConnectionStates.ESTABLISHED
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self._send_pending_commands()
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def stopProducing(self):
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"""We're never going to send any more data (normally because either
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we or the remote has closed the connection)
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"""
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logger.info("[%s] Stop producing", self.id())
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self.on_connection_closed()
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def connectionLost(self, reason):
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logger.info("[%s] Replication connection closed: %r", self.id(), reason)
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if isinstance(reason, Failure):
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connection_close_counter.labels(reason.type.__name__).inc()
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else:
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connection_close_counter.labels(reason.__class__.__name__).inc()
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try:
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# Remove us from list of connections to be monitored
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connected_connections.remove(self)
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except ValueError:
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pass
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# Stop the looping call sending pings.
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if self._send_ping_loop and self._send_ping_loop.running:
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self._send_ping_loop.stop()
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self.on_connection_closed()
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def on_connection_closed(self):
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logger.info("[%s] Connection was closed", self.id())
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self.state = ConnectionStates.CLOSED
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self.pending_commands = []
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if self.transport:
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self.transport.unregisterProducer()
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def __str__(self):
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return "ReplicationConnection<name=%s,conn_id=%s,addr=%s>" % (
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self.name, self.conn_id, self.addr,
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)
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def id(self):
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return "%s-%s" % (self.name, self.conn_id)
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class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol):
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VALID_INBOUND_COMMANDS = VALID_CLIENT_COMMANDS
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VALID_OUTBOUND_COMMANDS = VALID_SERVER_COMMANDS
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def __init__(self, server_name, clock, streamer, addr):
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BaseReplicationStreamProtocol.__init__(self, clock) # Old style class
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self.server_name = server_name
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self.streamer = streamer
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self.addr = addr
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# The streams the client has subscribed to and is up to date with
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self.replication_streams = set()
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# The streams the client is currently subscribing to.
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self.connecting_streams = set()
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# Map from stream name to list of updates to send once we've finished
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# subscribing the client to the stream.
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self.pending_rdata = {}
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def connectionMade(self):
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self.send_command(ServerCommand(self.server_name))
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BaseReplicationStreamProtocol.connectionMade(self)
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self.streamer.new_connection(self)
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def on_NAME(self, cmd):
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logger.info("[%s] Renamed to %r", self.id(), cmd.data)
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self.name = cmd.data
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def on_USER_SYNC(self, cmd):
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return self.streamer.on_user_sync(
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self.conn_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms,
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)
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def on_REPLICATE(self, cmd):
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stream_name = cmd.stream_name
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token = cmd.token
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if stream_name == "ALL":
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# Subscribe to all streams we're publishing to.
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deferreds = [
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run_in_background(
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self.subscribe_to_stream,
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stream, token,
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)
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for stream in iterkeys(self.streamer.streams_by_name)
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]
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return make_deferred_yieldable(
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defer.gatherResults(deferreds, consumeErrors=True)
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)
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else:
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return self.subscribe_to_stream(stream_name, token)
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def on_FEDERATION_ACK(self, cmd):
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return self.streamer.federation_ack(cmd.token)
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def on_REMOVE_PUSHER(self, cmd):
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return self.streamer.on_remove_pusher(
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cmd.app_id, cmd.push_key, cmd.user_id,
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)
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def on_INVALIDATE_CACHE(self, cmd):
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return self.streamer.on_invalidate_cache(cmd.cache_func, cmd.keys)
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def on_USER_IP(self, cmd):
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return self.streamer.on_user_ip(
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cmd.user_id, cmd.access_token, cmd.ip, cmd.user_agent, cmd.device_id,
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cmd.last_seen,
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)
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@defer.inlineCallbacks
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def subscribe_to_stream(self, stream_name, token):
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"""Subscribe the remote to a streams.
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This invloves checking if they've missed anything and sending those
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updates down if they have. During that time new updates for the stream
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are queued and sent once we've sent down any missed updates.
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"""
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self.replication_streams.discard(stream_name)
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self.connecting_streams.add(stream_name)
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try:
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# Get missing updates
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updates, current_token = yield self.streamer.get_stream_updates(
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stream_name, token,
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)
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# Send all the missing updates
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for update in updates:
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token, row = update[0], update[1]
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self.send_command(RdataCommand(stream_name, token, row))
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# We send a POSITION command to ensure that they have an up to
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# date token (especially useful if we didn't send any updates
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# above)
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self.send_command(PositionCommand(stream_name, current_token))
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# Now we can send any updates that came in while we were subscribing
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pending_rdata = self.pending_rdata.pop(stream_name, [])
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for token, update in pending_rdata:
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# Only send updates newer than the current token
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if token > current_token:
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self.send_command(RdataCommand(stream_name, token, update))
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# They're now fully subscribed
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self.replication_streams.add(stream_name)
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except Exception as e:
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logger.exception("[%s] Failed to handle REPLICATE command", self.id())
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self.send_error("failed to handle replicate: %r", e)
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finally:
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self.connecting_streams.discard(stream_name)
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def stream_update(self, stream_name, token, data):
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"""Called when a new update is available to stream to clients.
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We need to check if the client is interested in the stream or not
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"""
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if stream_name in self.replication_streams:
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# The client is subscribed to the stream
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self.send_command(RdataCommand(stream_name, token, data))
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elif stream_name in self.connecting_streams:
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# The client is being subscribed to the stream
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logger.debug("[%s] Queuing RDATA %r %r", self.id(), stream_name, token)
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self.pending_rdata.setdefault(stream_name, []).append((token, data))
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else:
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# The client isn't subscribed
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logger.debug("[%s] Dropping RDATA %r %r", self.id(), stream_name, token)
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def send_sync(self, data):
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self.send_command(SyncCommand(data))
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def on_connection_closed(self):
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BaseReplicationStreamProtocol.on_connection_closed(self)
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self.streamer.lost_connection(self)
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class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
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VALID_INBOUND_COMMANDS = VALID_SERVER_COMMANDS
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VALID_OUTBOUND_COMMANDS = VALID_CLIENT_COMMANDS
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def __init__(self, client_name, server_name, clock, handler):
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BaseReplicationStreamProtocol.__init__(self, clock)
|
|
|
|
self.client_name = client_name
|
|
self.server_name = server_name
|
|
self.handler = handler
|
|
|
|
# Map of stream to batched updates. See RdataCommand for info on how
|
|
# batching works.
|
|
self.pending_batches = {}
|
|
|
|
def connectionMade(self):
|
|
self.send_command(NameCommand(self.client_name))
|
|
BaseReplicationStreamProtocol.connectionMade(self)
|
|
|
|
# Once we've connected subscribe to the necessary streams
|
|
for stream_name, token in iteritems(self.handler.get_streams_to_replicate()):
|
|
self.replicate(stream_name, token)
|
|
|
|
# Tell the server if we have any users currently syncing (should only
|
|
# happen on synchrotrons)
|
|
currently_syncing = self.handler.get_currently_syncing_users()
|
|
now = self.clock.time_msec()
|
|
for user_id in currently_syncing:
|
|
self.send_command(UserSyncCommand(user_id, True, now))
|
|
|
|
# We've now finished connecting to so inform the client handler
|
|
self.handler.update_connection(self)
|
|
|
|
def on_SERVER(self, cmd):
|
|
if cmd.data != self.server_name:
|
|
logger.error("[%s] Connected to wrong remote: %r", self.id(), cmd.data)
|
|
self.send_error("Wrong remote")
|
|
|
|
def on_RDATA(self, cmd):
|
|
stream_name = cmd.stream_name
|
|
inbound_rdata_count.labels(stream_name).inc()
|
|
|
|
try:
|
|
row = STREAMS_MAP[stream_name].ROW_TYPE(*cmd.row)
|
|
except Exception:
|
|
logger.exception(
|
|
"[%s] Failed to parse RDATA: %r %r",
|
|
self.id(), stream_name, cmd.row
|
|
)
|
|
raise
|
|
|
|
if cmd.token is None:
|
|
# I.e. this is part of a batch of updates for this stream. Batch
|
|
# until we get an update for the stream with a non None token
|
|
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)
|
|
return self.handler.on_rdata(stream_name, cmd.token, rows)
|
|
|
|
def on_POSITION(self, cmd):
|
|
return self.handler.on_position(cmd.stream_name, cmd.token)
|
|
|
|
def on_SYNC(self, cmd):
|
|
return self.handler.on_sync(cmd.data)
|
|
|
|
def replicate(self, stream_name, token):
|
|
"""Send the subscription request to the server
|
|
"""
|
|
if stream_name not in STREAMS_MAP:
|
|
raise Exception("Invalid stream name %r" % (stream_name,))
|
|
|
|
logger.info(
|
|
"[%s] Subscribing to replication stream: %r from %r",
|
|
self.id(), stream_name, token
|
|
)
|
|
|
|
self.send_command(ReplicateCommand(stream_name, token))
|
|
|
|
def on_connection_closed(self):
|
|
BaseReplicationStreamProtocol.on_connection_closed(self)
|
|
self.handler.update_connection(None)
|
|
|
|
|
|
# The following simply registers metrics for the replication connections
|
|
|
|
pending_commands = LaterGauge(
|
|
"synapse_replication_tcp_protocol_pending_commands",
|
|
"",
|
|
["name", "conn_id"],
|
|
lambda: {
|
|
(p.name, p.conn_id): len(p.pending_commands) for p in connected_connections
|
|
},
|
|
)
|
|
|
|
|
|
def transport_buffer_size(protocol):
|
|
if protocol.transport:
|
|
size = len(protocol.transport.dataBuffer) + protocol.transport._tempDataLen
|
|
return size
|
|
return 0
|
|
|
|
|
|
transport_send_buffer = LaterGauge(
|
|
"synapse_replication_tcp_protocol_transport_send_buffer",
|
|
"",
|
|
["name", "conn_id"],
|
|
lambda: {
|
|
(p.name, p.conn_id): transport_buffer_size(p) for p in connected_connections
|
|
},
|
|
)
|
|
|
|
|
|
def transport_kernel_read_buffer_size(protocol, read=True):
|
|
SIOCINQ = 0x541B
|
|
SIOCOUTQ = 0x5411
|
|
|
|
if protocol.transport:
|
|
fileno = protocol.transport.getHandle().fileno()
|
|
if read:
|
|
op = SIOCINQ
|
|
else:
|
|
op = SIOCOUTQ
|
|
size = struct.unpack("I", fcntl.ioctl(fileno, op, '\0\0\0\0'))[0]
|
|
return size
|
|
return 0
|
|
|
|
|
|
tcp_transport_kernel_send_buffer = LaterGauge(
|
|
"synapse_replication_tcp_protocol_transport_kernel_send_buffer",
|
|
"",
|
|
["name", "conn_id"],
|
|
lambda: {
|
|
(p.name, p.conn_id): transport_kernel_read_buffer_size(p, False)
|
|
for p in connected_connections
|
|
},
|
|
)
|
|
|
|
|
|
tcp_transport_kernel_read_buffer = LaterGauge(
|
|
"synapse_replication_tcp_protocol_transport_kernel_read_buffer",
|
|
"",
|
|
["name", "conn_id"],
|
|
lambda: {
|
|
(p.name, p.conn_id): transport_kernel_read_buffer_size(p, True)
|
|
for p in connected_connections
|
|
},
|
|
)
|
|
|
|
|
|
tcp_inbound_commands = LaterGauge(
|
|
"synapse_replication_tcp_protocol_inbound_commands",
|
|
"",
|
|
["command", "name", "conn_id"],
|
|
lambda: {
|
|
(k[0], p.name, p.conn_id): count
|
|
for p in connected_connections
|
|
for k, count in iteritems(p.inbound_commands_counter)
|
|
},
|
|
)
|
|
|
|
tcp_outbound_commands = LaterGauge(
|
|
"synapse_replication_tcp_protocol_outbound_commands",
|
|
"",
|
|
["command", "name", "conn_id"],
|
|
lambda: {
|
|
(k[0], p.name, p.conn_id): count
|
|
for p in connected_connections
|
|
for k, count in iteritems(p.outbound_commands_counter)
|
|
},
|
|
)
|
|
|
|
# number of updates received for each RDATA stream
|
|
inbound_rdata_count = Counter(
|
|
"synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"]
|
|
)
|