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Move server command handling out of TCP protocol (#7187)

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This completes the merging of server and client command processing.
This commit is contained in:
Erik Johnston 2020-04-07 10:51:07 +01:00 committed by GitHub
parent 71953139d1
commit 82498ee901
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4 changed files with 238 additions and 270 deletions
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1
changelog.d/7187.misc Normal file
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@ -0,0 +1 @@
Move server command handling out of TCP protocol.

179
synapse/replication/tcp/handler.py
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@ -19,8 +19,10 @@ from typing import Any, Callable, Dict, List, Optional, Set
from prometheus_client import Counter
from synapse.metrics import LaterGauge
from synapse.replication.tcp.client import ReplicationClientFactory
from synapse.replication.tcp.commands import (
ClearUserSyncsCommand,
Command,
FederationAckCommand,
InvalidateCacheCommand,
@ -28,10 +30,12 @@ from synapse.replication.tcp.commands import (
RdataCommand,
RemoteServerUpCommand,
RemovePusherCommand,
ReplicateCommand,
SyncCommand,
UserIpCommand,
UserSyncCommand,
)
from synapse.replication.tcp.protocol import AbstractConnection
from synapse.replication.tcp.streams import STREAMS_MAP, Stream
from synapse.util.async_helpers import Linearizer
@ -42,6 +46,13 @@ logger = logging.getLogger(__name__)
inbound_rdata_count = Counter(
"synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"]
)
user_sync_counter = Counter("synapse_replication_tcp_resource_user_sync", "")
federation_ack_counter = Counter("synapse_replication_tcp_resource_federation_ack", "")
remove_pusher_counter = Counter("synapse_replication_tcp_resource_remove_pusher", "")
invalidate_cache_counter = Counter(
"synapse_replication_tcp_resource_invalidate_cache", ""
)
user_ip_cache_counter = Counter("synapse_replication_tcp_resource_user_ip_cache", "")
class ReplicationCommandHandler:
@ -52,6 +63,10 @@ class ReplicationCommandHandler:
def __init__(self, hs):
self._replication_data_handler = hs.get_replication_data_handler()
self._presence_handler = hs.get_presence_handler()
self._store = hs.get_datastore()
self._notifier = hs.get_notifier()
self._clock = hs.get_clock()
self._instance_id = hs.get_instance_id()
# Set of streams that we've caught up with.
self._streams_connected = set() # type: Set[str]
@ -69,8 +84,26 @@ class ReplicationCommandHandler:
# The factory used to create connections.
self._factory = None # type: Optional[ReplicationClientFactory]
# The current connection. None if we are currently (re)connecting
self._connection = None
# The currently connected connections.
self._connections = [] # type: List[AbstractConnection]
LaterGauge(
"synapse_replication_tcp_resource_total_connections",
"",
[],
lambda: len(self._connections),
)
self._is_master = hs.config.worker_app is None
self._federation_sender = None
if self._is_master and not hs.config.send_federation:
self._federation_sender = hs.get_federation_sender()
self._server_notices_sender = None
if self._is_master:
self._server_notices_sender = hs.get_server_notices_sender()
self._notifier.add_remote_server_up_callback(self.send_remote_server_up)
def start_replication(self, hs):
"""Helper method to start a replication connection to the remote server
@ -82,6 +115,70 @@ class ReplicationCommandHandler:
port = hs.config.worker_replication_port
hs.get_reactor().connectTCP(host, port, self._factory)
async def on_REPLICATE(self, cmd: ReplicateCommand):
# We only want to announce positions by the writer of the streams.
# Currently this is just the master process.
if not self._is_master:
return
for stream_name, stream in self._streams.items():
current_token = stream.current_token()
self.send_command(PositionCommand(stream_name, current_token))
async def on_USER_SYNC(self, cmd: UserSyncCommand):
user_sync_counter.inc()
if self._is_master:
await self._presence_handler.update_external_syncs_row(
cmd.instance_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms
)
async def on_CLEAR_USER_SYNC(self, cmd: ClearUserSyncsCommand):
if self._is_master:
await self._presence_handler.update_external_syncs_clear(cmd.instance_id)
async def on_FEDERATION_ACK(self, cmd: FederationAckCommand):
federation_ack_counter.inc()
if self._federation_sender:
self._federation_sender.federation_ack(cmd.token)
async def on_REMOVE_PUSHER(self, cmd: RemovePusherCommand):
remove_pusher_counter.inc()
if self._is_master:
await self._store.delete_pusher_by_app_id_pushkey_user_id(
app_id=cmd.app_id, pushkey=cmd.push_key, user_id=cmd.user_id
)
self._notifier.on_new_replication_data()
async def on_INVALIDATE_CACHE(self, cmd: InvalidateCacheCommand):
invalidate_cache_counter.inc()
if self._is_master:
# We invalidate the cache locally, but then also stream that to other
# workers.
await self._store.invalidate_cache_and_stream(
cmd.cache_func, tuple(cmd.keys)
)
async def on_USER_IP(self, cmd: UserIpCommand):
user_ip_cache_counter.inc()
if self._is_master:
await self._store.insert_client_ip(
cmd.user_id,
cmd.access_token,
cmd.ip,
cmd.user_agent,
cmd.device_id,
cmd.last_seen,
)
if self._server_notices_sender:
await self._server_notices_sender.on_user_ip(cmd.user_id)
async def on_RDATA(self, cmd: RdataCommand):
stream_name = cmd.stream_name
inbound_rdata_count.labels(stream_name).inc()
@ -174,6 +271,9 @@ class ReplicationCommandHandler:
""""Called when get a new REMOTE_SERVER_UP command."""
self._replication_data_handler.on_remote_server_up(cmd.data)
if self._is_master:
self._notifier.notify_remote_server_up(cmd.data)
def get_currently_syncing_users(self):
"""Get the list of currently syncing users (if any). This is called
when a connection has been established and we need to send the
@ -181,29 +281,63 @@ class ReplicationCommandHandler:
"""
return self._presence_handler.get_currently_syncing_users()
def update_connection(self, connection):
"""Called when a connection has been established (or lost with None).
def new_connection(self, connection: AbstractConnection):
"""Called when we have a new connection.
"""
self._connection = connection
self._connections.append(connection)
def finished_connecting(self):
"""Called when we have successfully subscribed and caught up to all
streams we're interested in.
"""
logger.info("Finished connecting to server")
# We don't reset the delay any earlier as otherwise if there is a
# problem during start up we'll end up tight looping connecting to the
# server.
# If we are connected to replication as a client (rather than a server)
# we need to reset the reconnection delay on the client factory (which
# is used to do exponential back off when the connection drops).
#
# Ideally we would reset the delay when we've "fully established" the
# connection (for some definition thereof) to stop us from tightlooping
# on reconnection if something fails after this point and we drop the
# connection. Unfortunately, we don't really have a better definition of
# "fully established" than the connection being established.
if self._factory:
self._factory.resetDelay()
def send_command(self, cmd: Command):
"""Send a command to master (when we get establish a connection if we
don't have one already.)
# Tell the server if we have any users currently syncing (should only
# happen on synchrotrons)
currently_syncing = self.get_currently_syncing_users()
now = self._clock.time_msec()
for user_id in currently_syncing:
connection.send_command(
UserSyncCommand(self._instance_id, user_id, True, now)
)
def lost_connection(self, connection: AbstractConnection):
"""Called when a connection is closed/lost.
"""
if self._connection:
self._connection.send_command(cmd)
try:
self._connections.remove(connection)
except ValueError:
pass
def connected(self) -> bool:
"""Do we have any replication connections open?
Is used by e.g. `ReplicationStreamer` to no-op if nothing is connected.
"""
return bool(self._connections)
def send_command(self, cmd: Command):
"""Send a command to all connected connections.
"""
if self._connections:
for connection in self._connections:
try:
connection.send_command(cmd)
except Exception:
# We probably want to catch some types of exceptions here
# and log them as warnings (e.g. connection gone), but I
# can't find what those exception types they would be.
logger.exception(
"Failed to write command %s to connection %s",
cmd.NAME,
connection,
)
else:
logger.warning("Dropping command as not connected: %r", cmd.NAME)
@ -250,3 +384,10 @@ class ReplicationCommandHandler:
def send_remote_server_up(self, server: str):
self.send_command(RemoteServerUpCommand(server))
def stream_update(self, stream_name: str, token: str, data: Any):
"""Called when a new update is available to stream to clients.
We need to check if the client is interested in the stream or not
"""
self.send_command(RdataCommand(stream_name, token, data))

165
synapse/replication/tcp/protocol.py
View File

@ -46,6 +46,7 @@ indicate which side is sending, these are *not* included on the wire::
> ERROR server stopping
* connection closed by server *
"""
import abc
import fcntl
import logging
import struct
@ -69,13 +70,8 @@ from synapse.replication.tcp.commands import (
ErrorCommand,
NameCommand,
PingCommand,
PositionCommand,
RdataCommand,
RemoteServerUpCommand,
ReplicateCommand,
ServerCommand,
SyncCommand,
UserSyncCommand,
)
from synapse.types import Collection
from synapse.util import Clock
@ -118,7 +114,7 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
are only sent by the server.
On receiving a new command it calls `on_<COMMAND_NAME>` with the parsed
command.
command before delegating to `ReplicationCommandHandler.on_<COMMAND_NAME>`.
It also sends `PING` periodically, and correctly times out remote connections
(if they send a `PING` command)
@ -134,8 +130,9 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
max_line_buffer = 10000
def __init__(self, clock):
def __init__(self, clock: Clock, handler: "ReplicationCommandHandler"):
self.clock = clock
self.command_handler = handler
self.last_received_command = self.clock.time_msec()
self.last_sent_command = 0
@ -175,6 +172,8 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
# can time us out.
self.send_command(PingCommand(self.clock.time_msec()))
self.command_handler.new_connection(self)
def send_ping(self):
"""Periodically sends a ping and checks if we should close the connection
due to the other side timing out.
@ -243,13 +242,31 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
async def handle_command(self, cmd: Command):
"""Handle a command we have received over the replication stream.
By default delegates to on_<COMMAND>, which should return an awaitable.
First calls `self.on_<COMMAND>` if it exists, then calls
`self.command_handler.on_<COMMAND>` if it exists. This allows for
protocol level handling of commands (e.g. PINGs), before delegating to
the handler.
Args:
cmd: received command
"""
handler = getattr(self, "on_%s" % (cmd.NAME,))
await handler(cmd)
handled = False
# First call any command handlers on this instance. These are for TCP
# specific handling.
cmd_func = getattr(self, "on_%s" % (cmd.NAME,), None)
if cmd_func:
await cmd_func(cmd)
handled = True
# Then call out to the handler.
cmd_func = getattr(self.command_handler, "on_%s" % (cmd.NAME,), None)
if cmd_func:
await cmd_func(cmd)
handled = True
if not handled:
logger.warning("Unhandled command: %r", cmd)
def close(self):
logger.warning("[%s] Closing connection", self.id())
@ -378,6 +395,8 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
self.state = ConnectionStates.CLOSED
self.pending_commands = []
self.command_handler.lost_connection(self)
if self.transport:
self.transport.unregisterProducer()
@ -404,74 +423,21 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol):
VALID_INBOUND_COMMANDS = VALID_CLIENT_COMMANDS
VALID_OUTBOUND_COMMANDS = VALID_SERVER_COMMANDS
def __init__(self, server_name, clock, streamer):
BaseReplicationStreamProtocol.__init__(self, clock) # Old style class
def __init__(
self, server_name: str, clock: Clock, handler: "ReplicationCommandHandler"
):
super().__init__(clock, handler)
self.server_name = server_name
self.streamer = streamer
def connectionMade(self):
self.send_command(ServerCommand(self.server_name))
BaseReplicationStreamProtocol.connectionMade(self)
self.streamer.new_connection(self)
super().connectionMade()
async def on_NAME(self, cmd):
logger.info("[%s] Renamed to %r", self.id(), cmd.data)
self.name = cmd.data
async def on_USER_SYNC(self, cmd):
await self.streamer.on_user_sync(
cmd.instance_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms
)
async def on_CLEAR_USER_SYNC(self, cmd):
await self.streamer.on_clear_user_syncs(cmd.instance_id)
async def on_REPLICATE(self, cmd):
# Subscribe to all streams we're publishing to.
for stream_name in self.streamer.streams_by_name:
current_token = self.streamer.get_stream_token(stream_name)
self.send_command(PositionCommand(stream_name, current_token))
async def on_FEDERATION_ACK(self, cmd):
self.streamer.federation_ack(cmd.token)
async def on_REMOVE_PUSHER(self, cmd):
await self.streamer.on_remove_pusher(cmd.app_id, cmd.push_key, cmd.user_id)
async def on_INVALIDATE_CACHE(self, cmd):
await self.streamer.on_invalidate_cache(cmd.cache_func, cmd.keys)
async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand):
self.streamer.on_remote_server_up(cmd.data)
async def on_USER_IP(self, cmd):
self.streamer.on_user_ip(
cmd.user_id,
cmd.access_token,
cmd.ip,
cmd.user_agent,
cmd.device_id,
cmd.last_seen,
)
def stream_update(self, stream_name, token, data):
"""Called when a new update is available to stream to clients.
We need to check if the client is interested in the stream or not
"""
self.send_command(RdataCommand(stream_name, token, data))
def send_sync(self, data):
self.send_command(SyncCommand(data))
def send_remote_server_up(self, server: str):
self.send_command(RemoteServerUpCommand(server))
def on_connection_closed(self):
BaseReplicationStreamProtocol.on_connection_closed(self)
self.streamer.lost_connection(self)
class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
VALID_INBOUND_COMMANDS = VALID_SERVER_COMMANDS
@ -485,59 +451,18 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
clock: Clock,
command_handler: "ReplicationCommandHandler",
):
BaseReplicationStreamProtocol.__init__(self, clock)
self.instance_id = hs.get_instance_id()
super().__init__(clock, command_handler)
self.client_name = client_name
self.server_name = server_name
self.handler = command_handler
def connectionMade(self):
self.send_command(NameCommand(self.client_name))
BaseReplicationStreamProtocol.connectionMade(self)
super().connectionMade()
# Once we've connected subscribe to the necessary streams
self.replicate()
# 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(self.instance_id, user_id, True, now))
# We've now finished connecting to so inform the client handler
self.handler.update_connection(self)
self.handler.finished_connecting()
async def handle_command(self, cmd: Command):
"""Handle a command we have received over the replication stream.
Delegates to `command_handler.on_<COMMAND>`, which must return an
awaitable.
Args:
cmd: received command
"""
handled = False
# First call any command handlers on this instance. These are for TCP
# specific handling.
cmd_func = getattr(self, "on_%s" % (cmd.NAME,), None)
if cmd_func:
await cmd_func(cmd)
handled = True
# Then call out to the handler.
cmd_func = getattr(self.handler, "on_%s" % (cmd.NAME,), None)
if cmd_func:
await cmd_func(cmd)
handled = True
if not handled:
logger.warning("Unhandled command: %r", cmd)
async def on_SERVER(self, cmd):
if cmd.data != self.server_name:
logger.error("[%s] Connected to wrong remote: %r", self.id(), cmd.data)
@ -550,9 +475,21 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
self.send_command(ReplicateCommand())
def on_connection_closed(self):
BaseReplicationStreamProtocol.on_connection_closed(self)
self.handler.update_connection(None)
class AbstractConnection(abc.ABC):
"""An interface for replication connections.
"""
@abc.abstractmethod
def send_command(self, cmd: Command):
"""Send the command down the connection
"""
pass
# This tells python that `BaseReplicationStreamProtocol` implements the
# interface.
AbstractConnection.register(BaseReplicationStreamProtocol)
# The following simply registers metrics for the replication connections

163
synapse/replication/tcp/resource.py
View File

@ -17,7 +17,7 @@
import logging
import random
from typing import Any, Dict, List
from typing import Dict
from six import itervalues
@ -25,24 +25,14 @@ from prometheus_client import Counter
from twisted.internet.protocol import Factory
from synapse.metrics import LaterGauge
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util.metrics import Measure, measure_func
from .protocol import ServerReplicationStreamProtocol
from .streams import STREAMS_MAP, Stream
from .streams.federation import FederationStream
from synapse.replication.tcp.protocol import ServerReplicationStreamProtocol
from synapse.replication.tcp.streams import STREAMS_MAP, FederationStream, Stream
from synapse.util.metrics import Measure
stream_updates_counter = Counter(
"synapse_replication_tcp_resource_stream_updates", "", ["stream_name"]
)
user_sync_counter = Counter("synapse_replication_tcp_resource_user_sync", "")
federation_ack_counter = Counter("synapse_replication_tcp_resource_federation_ack", "")
remove_pusher_counter = Counter("synapse_replication_tcp_resource_remove_pusher", "")
invalidate_cache_counter = Counter(
"synapse_replication_tcp_resource_invalidate_cache", ""
)
user_ip_cache_counter = Counter("synapse_replication_tcp_resource_user_ip_cache", "")
logger = logging.getLogger(__name__)
@ -52,13 +42,23 @@ class ReplicationStreamProtocolFactory(Factory):
"""
def __init__(self, hs):
self.streamer = hs.get_replication_streamer()
self.command_handler = hs.get_tcp_replication()
self.clock = hs.get_clock()
self.server_name = hs.config.server_name
# If we've created a `ReplicationStreamProtocolFactory` then we're
# almost certainly registering a replication listener, so let's ensure
# that we've started a `ReplicationStreamer` instance to actually push
# data.
#
# (This is a bit of a weird place to do this, but the alternatives such
# as putting this in `HomeServer.setup()`, requires either passing the
# listener config again or always starting a `ReplicationStreamer`.)
hs.get_replication_streamer()
def buildProtocol(self, addr):
return ServerReplicationStreamProtocol(
self.server_name, self.clock, self.streamer
self.server_name, self.clock, self.command_handler
)
@ -78,16 +78,6 @@ class ReplicationStreamer(object):
self._replication_torture_level = hs.config.replication_torture_level
# Current connections.
self.connections = [] # type: List[ServerReplicationStreamProtocol]
LaterGauge(
"synapse_replication_tcp_resource_total_connections",
"",
[],
lambda: len(self.connections),
)
# List of streams that clients can subscribe to.
# We only support federation stream if federation sending hase been
# disabled on the master.
@ -104,18 +94,12 @@ class ReplicationStreamer(object):
self.federation_sender = hs.get_federation_sender()
self.notifier.add_replication_callback(self.on_notifier_poke)
self.notifier.add_remote_server_up_callback(self.send_remote_server_up)
# Keeps track of whether we are currently checking for updates
self.is_looping = False
self.pending_updates = False
hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.on_shutdown)
def on_shutdown(self):
# close all connections on shutdown
for conn in self.connections:
conn.send_error("server shutting down")
self.command_handler = hs.get_tcp_replication()
def get_streams(self) -> Dict[str, Stream]:
"""Get a mapp from stream name to stream instance.
@ -129,7 +113,7 @@ class ReplicationStreamer(object):
This should get called each time new data is available, even if it
is currently being executed, so that nothing gets missed
"""
if not self.connections:
if not self.command_handler.connected():
# Don't bother if nothing is listening. We still need to advance
# the stream tokens otherwise they'll fall beihind forever
for stream in self.streams:
@ -186,9 +170,7 @@ class ReplicationStreamer(object):
raise
logger.debug(
"Sending %d updates to %d connections",
len(updates),
len(self.connections),
"Sending %d updates", len(updates),
)
if updates:
@ -204,112 +186,19 @@ class ReplicationStreamer(object):
# token. See RdataCommand for more details.
batched_updates = _batch_updates(updates)
for conn in self.connections:
for token, row in batched_updates:
try:
conn.stream_update(stream.NAME, token, row)
except Exception:
logger.exception("Failed to replicate")
for token, row in batched_updates:
try:
self.command_handler.stream_update(
stream.NAME, token, row
)
except Exception:
logger.exception("Failed to replicate")
logger.debug("No more pending updates, breaking poke loop")
finally:
self.pending_updates = False
self.is_looping = False
def get_stream_token(self, stream_name):
"""For a given stream get all updates since token. This is called when
a client first subscribes to a stream.
"""
stream = self.streams_by_name.get(stream_name, None)
if not stream:
raise Exception("unknown stream %s", stream_name)
return stream.current_token()
@measure_func("repl.federation_ack")
def federation_ack(self, token):
"""We've received an ack for federation stream from a client.
"""
federation_ack_counter.inc()
if self.federation_sender:
self.federation_sender.federation_ack(token)
@measure_func("repl.on_user_sync")
async def on_user_sync(self, instance_id, user_id, is_syncing, last_sync_ms):
"""A client has started/stopped syncing on a worker.
"""
user_sync_counter.inc()
await self.presence_handler.update_external_syncs_row(
instance_id, user_id, is_syncing, last_sync_ms
)
async def on_clear_user_syncs(self, instance_id):
"""A replication client wants us to drop all their UserSync data.
"""
await self.presence_handler.update_external_syncs_clear(instance_id)
@measure_func("repl.on_remove_pusher")
async def on_remove_pusher(self, app_id, push_key, user_id):
"""A client has asked us to remove a pusher
"""
remove_pusher_counter.inc()
await self.store.delete_pusher_by_app_id_pushkey_user_id(
app_id=app_id, pushkey=push_key, user_id=user_id
)
self.notifier.on_new_replication_data()
@measure_func("repl.on_invalidate_cache")
async def on_invalidate_cache(self, cache_func: str, keys: List[Any]):
"""The client has asked us to invalidate a cache
"""
invalidate_cache_counter.inc()
# We invalidate the cache locally, but then also stream that to other
# workers.
await self.store.invalidate_cache_and_stream(cache_func, tuple(keys))
@measure_func("repl.on_user_ip")
async def on_user_ip(
self, user_id, access_token, ip, user_agent, device_id, last_seen
):
"""The client saw a user request
"""
user_ip_cache_counter.inc()
await self.store.insert_client_ip(
user_id, access_token, ip, user_agent, device_id, last_seen
)
await self._server_notices_sender.on_user_ip(user_id)
@measure_func("repl.on_remote_server_up")
def on_remote_server_up(self, server: str):
self.notifier.notify_remote_server_up(server)
def send_remote_server_up(self, server: str):
for conn in self.connections:
conn.send_remote_server_up(server)
def send_sync_to_all_connections(self, data):
"""Sends a SYNC command to all clients.
Used in tests.
"""
for conn in self.connections:
conn.send_sync(data)
def new_connection(self, connection):
"""A new client connection has been established
"""
self.connections.append(connection)
def lost_connection(self, connection):
"""A client connection has been lost
"""
try:
self.connections.remove(connection)
except ValueError:
pass
def _batch_updates(updates):
"""Takes a list of updates of form [(token, row)] and sets the token to