758 lines
25 KiB
Python
758 lines
25 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
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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 ["ev", ["$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 abc
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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 typing import Any, DefaultDict, Dict, List, Set
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from six import iteritems
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from prometheus_client import Counter
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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.replication.tcp.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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Command,
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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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RemoteServerUpCommand,
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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 synapse.replication.tcp.streams import STREAMS_MAP, Stream
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from synapse.server import HomeServer
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from synapse.types import Collection
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from synapse.util import Clock
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from synapse.util.stringutils import random_string
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connection_close_counter = Counter(
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"synapse_replication_tcp_protocol_close_reason", "", ["reason_type"]
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)
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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 commands we expect to receive
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VALID_INBOUND_COMMANDS = [] # type: Collection[str]
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# Valid commands we can send
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VALID_OUTBOUND_COMMANDS = [] # type: Collection[str]
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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 = [] # type: List[Command]
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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) # type: DefaultDict[str, int]
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self.outbound_commands_counter = defaultdict(int) # type: DefaultDict[str, 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 (
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self.received_ping
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and now - self.last_received_command > PING_TIMEOUT_MS
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):
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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(),
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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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)
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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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run_as_background_process(
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"replication-" + cmd.get_logcontext_id(), self.handle_command, cmd
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)
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async def handle_command(self, cmd: Command):
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"""Handle a command we have received over the replication stream.
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By default delegates to on_<COMMAND>, which should return an awaitable.
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Args:
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cmd: received command
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"""
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handler = getattr(self, "on_%s" % (cmd.NAME,))
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await handler(cmd)
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def close(self):
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logger.warning("[%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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)
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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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encoded_string = string.encode("utf-8")
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if len(encoded_string) > self.MAX_LENGTH:
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raise Exception(
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"Failed to send command %s as too long (%d > %d)"
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% (cmd.NAME, len(encoded_string), self.MAX_LENGTH)
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)
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self.sendLine(encoded_string)
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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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async def on_PING(self, line):
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self.received_ping = True
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async 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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addr = None
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if self.transport:
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addr = str(self.transport.getPeer())
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return "ReplicationConnection<name=%s,conn_id=%s,addr=%s>" % (
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self.name,
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self.conn_id,
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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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def lineLengthExceeded(self, line):
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"""Called when we receive a line that is above the maximum line length
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"""
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self.send_error("Line length exceeded")
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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):
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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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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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async 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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async def on_USER_SYNC(self, cmd):
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await 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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async def on_REPLICATE(self, cmd):
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# Subscribe to all streams we're publishing to.
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for stream_name in self.streamer.streams_by_name:
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current_token = self.streamer.get_stream_token(stream_name)
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self.send_command(PositionCommand(stream_name, current_token))
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async def on_FEDERATION_ACK(self, cmd):
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self.streamer.federation_ack(cmd.token)
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async def on_REMOVE_PUSHER(self, cmd):
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await self.streamer.on_remove_pusher(cmd.app_id, cmd.push_key, cmd.user_id)
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async def on_INVALIDATE_CACHE(self, cmd):
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await self.streamer.on_invalidate_cache(cmd.cache_func, cmd.keys)
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async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand):
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self.streamer.on_remote_server_up(cmd.data)
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async def on_USER_IP(self, cmd):
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self.streamer.on_user_ip(
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cmd.user_id,
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cmd.access_token,
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cmd.ip,
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cmd.user_agent,
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cmd.device_id,
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cmd.last_seen,
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)
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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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self.send_command(RdataCommand(stream_name, token, data))
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def send_sync(self, data):
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self.send_command(SyncCommand(data))
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def send_remote_server_up(self, server: str):
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self.send_command(RemoteServerUpCommand(server))
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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 AbstractReplicationClientHandler(metaclass=abc.ABCMeta):
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"""
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The interface for the handler that should be passed to
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ClientReplicationStreamProtocol
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"""
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@abc.abstractmethod
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async 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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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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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def on_position(self, stream_name, token):
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"""Called when we get new position data."""
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raise NotImplementedError()
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@abc.abstractmethod
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def on_sync(self, data):
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"""Called when get a new SYNC command."""
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raise NotImplementedError()
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@abc.abstractmethod
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async def on_remote_server_up(self, server: str):
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"""Called when get a new REMOTE_SERVER_UP command."""
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raise NotImplementedError()
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@abc.abstractmethod
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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:
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map from stream name to the most recent update we have for
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that stream (ie, the point we want to start replicating from)
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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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."""
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raise NotImplementedError()
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@abc.abstractmethod
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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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raise NotImplementedError()
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@abc.abstractmethod
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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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raise NotImplementedError()
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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__(
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self,
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hs: HomeServer,
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client_name: str,
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server_name: str,
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clock: Clock,
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handler: AbstractReplicationClientHandler,
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):
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BaseReplicationStreamProtocol.__init__(self, clock)
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self.client_name = client_name
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self.server_name = server_name
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self.handler = handler
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self.streams = {
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stream.NAME: stream(hs) for stream in STREAMS_MAP.values()
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} # type: Dict[str, Stream]
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# Set of stream names that have been subscribe to, but haven't yet
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# caught up with. This is used to track when the client has been fully
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# connected to the remote.
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self.streams_connecting = set(STREAMS_MAP) # type: Set[str]
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# Map of stream to batched updates. See RdataCommand for info on how
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# batching works.
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self.pending_batches = {} # type: Dict[str, List[Any]]
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def connectionMade(self):
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self.send_command(NameCommand(self.client_name))
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BaseReplicationStreamProtocol.connectionMade(self)
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# Once we've connected subscribe to the necessary streams
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self.replicate()
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# Tell the server if we have any users currently syncing (should only
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# happen on synchrotrons)
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currently_syncing = self.handler.get_currently_syncing_users()
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now = self.clock.time_msec()
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for user_id in currently_syncing:
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self.send_command(UserSyncCommand(user_id, True, now))
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# We've now finished connecting to so inform the client handler
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self.handler.update_connection(self)
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async def on_SERVER(self, cmd):
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if cmd.data != self.server_name:
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logger.error("[%s] Connected to wrong remote: %r", self.id(), cmd.data)
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self.send_error("Wrong remote")
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async def on_RDATA(self, cmd):
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stream_name = cmd.stream_name
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inbound_rdata_count.labels(stream_name).inc()
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try:
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row = STREAMS_MAP[stream_name].parse_row(cmd.row)
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except Exception:
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logger.exception(
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"[%s] Failed to parse RDATA: %r %r", self.id(), stream_name, cmd.row
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)
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raise
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if cmd.token is None or stream_name in self.streams_connecting:
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# I.e. this is part of a batch of updates for this stream. Batch
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# until we get an update for the stream with a non None token
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self.pending_batches.setdefault(stream_name, []).append(row)
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else:
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# Check if this is the last of a batch of updates
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rows = self.pending_batches.pop(stream_name, [])
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rows.append(row)
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await self.handler.on_rdata(stream_name, cmd.token, rows)
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async def on_POSITION(self, cmd: PositionCommand):
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stream = self.streams.get(cmd.stream_name)
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if not stream:
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logger.error("Got POSITION for unknown stream: %s", cmd.stream_name)
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return
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# Find where we previously streamed up to.
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current_token = self.handler.get_streams_to_replicate().get(cmd.stream_name)
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if current_token is None:
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logger.warning(
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"Got POSITION for stream we're not subscribed to: %s", cmd.stream_name
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)
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return
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# Fetch all updates between then and now.
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limited = True
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while limited:
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updates, current_token, limited = await stream.get_updates_since(
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current_token, cmd.token
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)
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if updates:
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await self.handler.on_rdata(
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cmd.stream_name,
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current_token,
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[stream.parse_row(update[1]) for update in updates],
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)
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# We've now caught up to position sent to us, notify handler.
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await self.handler.on_position(cmd.stream_name, cmd.token)
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# When we get a `POSITION` command it means we've finished getting
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# missing updates for the given stream, and are now up to date.
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self.streams_connecting.discard(cmd.stream_name)
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if not self.streams_connecting:
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self.handler.finished_connecting()
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# Handle any RDATA that came in while we were catching up.
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rows = self.pending_batches.pop(cmd.stream_name, [])
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if rows:
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await self.handler.on_rdata(cmd.stream_name, rows[-1].token, rows)
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async def on_SYNC(self, cmd):
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self.handler.on_sync(cmd.data)
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async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand):
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self.handler.on_remote_server_up(cmd.data)
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def replicate(self):
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"""Send the subscription request to the server
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"""
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logger.info("[%s] Subscribing to replication streams", self.id())
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self.send_command(ReplicateCommand())
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def on_connection_closed(self):
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BaseReplicationStreamProtocol.on_connection_closed(self)
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self.handler.update_connection(None)
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# The following simply registers metrics for the replication connections
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pending_commands = LaterGauge(
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"synapse_replication_tcp_protocol_pending_commands",
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"",
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["name"],
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lambda: {(p.name,): len(p.pending_commands) for p in connected_connections},
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)
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def transport_buffer_size(protocol):
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if protocol.transport:
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size = len(protocol.transport.dataBuffer) + protocol.transport._tempDataLen
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return size
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return 0
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transport_send_buffer = LaterGauge(
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"synapse_replication_tcp_protocol_transport_send_buffer",
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"",
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["name"],
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lambda: {(p.name,): transport_buffer_size(p) for p in connected_connections},
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)
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def transport_kernel_read_buffer_size(protocol, read=True):
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SIOCINQ = 0x541B
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SIOCOUTQ = 0x5411
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if protocol.transport:
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fileno = protocol.transport.getHandle().fileno()
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if read:
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op = SIOCINQ
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else:
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op = SIOCOUTQ
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size = struct.unpack("I", fcntl.ioctl(fileno, op, b"\0\0\0\0"))[0]
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return size
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return 0
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tcp_transport_kernel_send_buffer = LaterGauge(
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"synapse_replication_tcp_protocol_transport_kernel_send_buffer",
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"",
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["name"],
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lambda: {
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(p.name,): transport_kernel_read_buffer_size(p, False)
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for p in connected_connections
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},
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)
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tcp_transport_kernel_read_buffer = LaterGauge(
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"synapse_replication_tcp_protocol_transport_kernel_read_buffer",
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"",
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["name"],
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lambda: {
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(p.name,): transport_kernel_read_buffer_size(p, True)
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for p in connected_connections
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},
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)
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tcp_inbound_commands = LaterGauge(
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"synapse_replication_tcp_protocol_inbound_commands",
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"",
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["command", "name"],
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lambda: {
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(k, p.name): count
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for p in connected_connections
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for k, count in iteritems(p.inbound_commands_counter)
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},
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)
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|
tcp_outbound_commands = LaterGauge(
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"synapse_replication_tcp_protocol_outbound_commands",
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|
"",
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["command", "name"],
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lambda: {
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(k, p.name): count
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for p in connected_connections
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for k, count in iteritems(p.outbound_commands_counter)
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},
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)
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# number of updates received for each RDATA stream
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|
inbound_rdata_count = Counter(
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|
"synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"]
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)
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