diff options
Diffstat (limited to 'synapse/replication/tcp/protocol.py')
| -rw-r--r-- | synapse/replication/tcp/protocol.py | 415 |
1 files changed, 76 insertions, 339 deletions
diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py index bc1482a9bb..7240acb0a2 100644 --- a/synapse/replication/tcp/protocol.py +++ b/synapse/replication/tcp/protocol.py @@ -35,9 +35,7 @@ indicate which side is sending, these are *not* included on the wire:: > PING 1490197665618 < NAME synapse.app.appservice < PING 1490197665618 - < REPLICATE events 1 - < REPLICATE backfill 1 - < REPLICATE caches 1 + < REPLICATE > POSITION events 1 > POSITION backfill 1 > POSITION caches 1 @@ -53,40 +51,37 @@ import fcntl import logging import struct from collections import defaultdict -from typing import Any, DefaultDict, Dict, List, Set, Tuple +from typing import TYPE_CHECKING, DefaultDict, List -from six import iteritems, iterkeys +from six import iteritems from prometheus_client import Counter -from twisted.internet import defer from twisted.protocols.basic import LineOnlyReceiver from twisted.python.failure import Failure -from synapse.logging.context import make_deferred_yieldable, run_in_background from synapse.metrics import LaterGauge from synapse.metrics.background_process_metrics import run_as_background_process from synapse.replication.tcp.commands import ( - COMMAND_MAP, VALID_CLIENT_COMMANDS, VALID_SERVER_COMMANDS, Command, ErrorCommand, NameCommand, PingCommand, - PositionCommand, - RdataCommand, - RemoteServerUpCommand, ReplicateCommand, ServerCommand, - SyncCommand, - UserSyncCommand, + parse_command_from_line, ) -from synapse.replication.tcp.streams import STREAMS_MAP from synapse.types import Collection from synapse.util import Clock from synapse.util.stringutils import random_string +if TYPE_CHECKING: + from synapse.replication.tcp.handler import ReplicationCommandHandler + from synapse.server import HomeServer + + connection_close_counter = Counter( "synapse_replication_tcp_protocol_close_reason", "", ["reason_type"] ) @@ -119,7 +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) @@ -135,8 +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 @@ -176,6 +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. @@ -203,39 +201,33 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver): ) self.send_error("ping timeout") - def lineReceived(self, line): + def lineReceived(self, line: bytes): """Called when we've received a line """ if line.strip() == "": # Ignore blank lines return - line = line.decode("utf-8") - cmd_name, rest_of_line = line.split(" ", 1) + linestr = line.decode("utf-8") + + try: + cmd = parse_command_from_line(linestr) + except Exception as e: + logger.exception("[%s] failed to parse line: %r", self.id(), linestr) + self.send_error("failed to parse line: %r (%r):" % (e, linestr)) + return - if cmd_name not in self.VALID_INBOUND_COMMANDS: - logger.error("[%s] invalid command %s", self.id(), cmd_name) - self.send_error("invalid command: %s", cmd_name) + if cmd.NAME not in self.VALID_INBOUND_COMMANDS: + logger.error("[%s] invalid command %s", self.id(), cmd.NAME) + self.send_error("invalid command: %s", cmd.NAME) return self.last_received_command = self.clock.time_msec() - self.inbound_commands_counter[cmd_name] = ( - self.inbound_commands_counter[cmd_name] + 1 + self.inbound_commands_counter[cmd.NAME] = ( + self.inbound_commands_counter[cmd.NAME] + 1 ) - cmd_cls = COMMAND_MAP[cmd_name] - try: - cmd = cmd_cls.from_line(rest_of_line) - except Exception as e: - logger.exception( - "[%s] failed to parse line %r: %r", self.id(), cmd_name, rest_of_line - ) - self.send_error( - "failed to parse line for %r: %r (%r):" % (cmd_name, e, rest_of_line) - ) - return - # Now lets try and call on_<CMD_NAME> function run_as_background_process( "replication-" + cmd.get_logcontext_id(), self.handle_command, cmd @@ -244,13 +236,31 @@ 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()) @@ -379,6 +389,8 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver): self.state = ConnectionStates.CLOSED self.pending_commands = [] + self.command_handler.lost_connection(self) + if self.transport: self.transport.unregisterProducer() @@ -405,232 +417,21 @@ 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 - - # The streams the client has subscribed to and is up to date with - self.replication_streams = set() # type: Set[str] - - # The streams the client is currently subscribing to. - self.connecting_streams = set() # type: Set[str] - - # Map from stream name to list of updates to send once we've finished - # subscribing the client to the stream. - self.pending_rdata = {} # type: Dict[str, List[Tuple[int, Any]]] 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( - self.conn_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms - ) - - async def on_REPLICATE(self, cmd): - stream_name = cmd.stream_name - token = cmd.token - - if stream_name == "ALL": - # Subscribe to all streams we're publishing to. - deferreds = [ - run_in_background(self.subscribe_to_stream, stream, token) - for stream in iterkeys(self.streamer.streams_by_name) - ] - - await make_deferred_yieldable( - defer.gatherResults(deferreds, consumeErrors=True) - ) - else: - await self.subscribe_to_stream(stream_name, 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, - ) - - async def subscribe_to_stream(self, stream_name, token): - """Subscribe the remote to a stream. - - This invloves checking if they've missed anything and sending those - updates down if they have. During that time new updates for the stream - are queued and sent once we've sent down any missed updates. - """ - self.replication_streams.discard(stream_name) - self.connecting_streams.add(stream_name) - - try: - # Get missing updates - updates, current_token = await self.streamer.get_stream_updates( - stream_name, token - ) - - # Send all the missing updates - for update in updates: - token, row = update[0], update[1] - self.send_command(RdataCommand(stream_name, token, row)) - - # We send a POSITION command to ensure that they have an up to - # date token (especially useful if we didn't send any updates - # above) - self.send_command(PositionCommand(stream_name, current_token)) - - # Now we can send any updates that came in while we were subscribing - pending_rdata = self.pending_rdata.pop(stream_name, []) - updates = [] - for token, update in pending_rdata: - # If the token is null, it is part of a batch update. Batches - # are multiple updates that share a single token. To denote - # this, the token is set to None for all tokens in the batch - # except for the last. If we find a None token, we keep looking - # through tokens until we find one that is not None and then - # process all previous updates in the batch as if they had the - # final token. - if token is None: - # Store this update as part of a batch - updates.append(update) - continue - - if token <= current_token: - # This update or batch of updates is older than - # current_token, dismiss it - updates = [] - continue - - updates.append(update) - - # Send all updates that are part of this batch with the - # found token - for update in updates: - self.send_command(RdataCommand(stream_name, token, update)) - - # Clear stored updates - updates = [] - - # They're now fully subscribed - self.replication_streams.add(stream_name) - except Exception as e: - logger.exception("[%s] Failed to handle REPLICATE command", self.id()) - self.send_error("failed to handle replicate: %r", e) - finally: - self.connecting_streams.discard(stream_name) - - 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 - """ - if stream_name in self.replication_streams: - # The client is subscribed to the stream - self.send_command(RdataCommand(stream_name, token, data)) - elif stream_name in self.connecting_streams: - # The client is being subscribed to the stream - logger.debug("[%s] Queuing RDATA %r %r", self.id(), stream_name, token) - self.pending_rdata.setdefault(stream_name, []).append((token, data)) - else: - # The client isn't subscribed - logger.debug("[%s] Dropping RDATA %r %r", self.id(), stream_name, token) - - 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 AbstractReplicationClientHandler(metaclass=abc.ABCMeta): - """ - The interface for the handler that should be passed to - ClientReplicationStreamProtocol - """ - - @abc.abstractmethod - async def on_rdata(self, stream_name, token, rows): - """Called to handle a batch of replication data with a given stream token. - - Args: - stream_name (str): name of the replication stream for this batch of rows - token (int): stream token for this batch of rows - rows (list): a list of Stream.ROW_TYPE objects as returned by - Stream.parse_row. - """ - raise NotImplementedError() - - @abc.abstractmethod - async def on_position(self, stream_name, token): - """Called when we get new position data.""" - raise NotImplementedError() - - @abc.abstractmethod - def on_sync(self, data): - """Called when get a new SYNC command.""" - raise NotImplementedError() - - @abc.abstractmethod - async def on_remote_server_up(self, server: str): - """Called when get a new REMOTE_SERVER_UP command.""" - raise NotImplementedError() - - @abc.abstractmethod - def get_streams_to_replicate(self): - """Called when a new connection has been established and we need to - subscribe to streams. - - Returns: - map from stream name to the most recent update we have for - that stream (ie, the point we want to start replicating from) - """ - raise NotImplementedError() - - @abc.abstractmethod - def get_currently_syncing_users(self): - """Get the list of currently syncing users (if any). This is called - when a connection has been established and we need to send the - currently syncing users.""" - raise NotImplementedError() - - @abc.abstractmethod - def update_connection(self, connection): - """Called when a connection has been established (or lost with None). - """ - raise NotImplementedError() - - @abc.abstractmethod - def finished_connecting(self): - """Called when we have successfully subscribed and caught up to all - streams we're interested in. - """ - raise NotImplementedError() - class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): VALID_INBOUND_COMMANDS = VALID_SERVER_COMMANDS @@ -638,110 +439,51 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): def __init__( self, + hs: "HomeServer", client_name: str, server_name: str, clock: Clock, - handler: AbstractReplicationClientHandler, + command_handler: "ReplicationCommandHandler", ): - BaseReplicationStreamProtocol.__init__(self, clock) + super().__init__(clock, command_handler) self.client_name = client_name self.server_name = server_name - self.handler = handler - - # Set of stream names that have been subscribe to, but haven't yet - # caught up with. This is used to track when the client has been fully - # connected to the remote. - self.streams_connecting = set() # type: Set[str] - - # Map of stream to batched updates. See RdataCommand for info on how - # batching works. - self.pending_batches = {} # type: Dict[str, Any] def connectionMade(self): self.send_command(NameCommand(self.client_name)) - BaseReplicationStreamProtocol.connectionMade(self) + super().connectionMade() # 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) - - # This will happen if we don't actually subscribe to any streams - if not self.streams_connecting: - self.handler.finished_connecting() + self.replicate() async 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") - async def on_RDATA(self, cmd): - stream_name = cmd.stream_name - inbound_rdata_count.labels(stream_name).inc() - - try: - row = STREAMS_MAP[stream_name].parse_row(cmd.row) - except Exception: - logger.exception( - "[%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) - await self.handler.on_rdata(stream_name, cmd.token, rows) - - async def on_POSITION(self, cmd): - # When we get a `POSITION` command it means we've finished getting - # missing updates for the given stream, and are now up to date. - self.streams_connecting.discard(cmd.stream_name) - if not self.streams_connecting: - self.handler.finished_connecting() + def replicate(self): + """Send the subscription request to the server + """ + logger.info("[%s] Subscribing to replication streams", self.id()) - await self.handler.on_position(cmd.stream_name, cmd.token) + self.send_command(ReplicateCommand()) - async def on_SYNC(self, cmd): - self.handler.on_sync(cmd.data) - async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand): - self.handler.on_remote_server_up(cmd.data) +class AbstractConnection(abc.ABC): + """An interface for replication connections. + """ - def replicate(self, stream_name, token): - """Send the subscription request to the server + @abc.abstractmethod + def send_command(self, cmd: Command): + """Send the command down the connection """ - 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.streams_connecting.add(stream_name) + pass - self.send_command(ReplicateCommand(stream_name, token)) - def on_connection_closed(self): - BaseReplicationStreamProtocol.on_connection_closed(self) - self.handler.update_connection(None) +# This tells python that `BaseReplicationStreamProtocol` implements the +# interface. +AbstractConnection.register(BaseReplicationStreamProtocol) # The following simply registers metrics for the replication connections @@ -827,8 +569,3 @@ tcp_outbound_commands = LaterGauge( 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"] -) |