diff options
Diffstat (limited to 'synapse/replication')
| -rw-r--r-- | synapse/replication/http/__init__.py | 2 | ||||
| -rw-r--r-- | synapse/replication/http/streams.py | 78 | ||||
| -rw-r--r-- | synapse/replication/slave/storage/_base.py | 14 | ||||
| -rw-r--r-- | synapse/replication/slave/storage/devices.py | 36 | ||||
| -rw-r--r-- | synapse/replication/slave/storage/pushers.py | 3 | ||||
| -rw-r--r-- | synapse/replication/tcp/__init__.py | 30 | ||||
| -rw-r--r-- | synapse/replication/tcp/client.py | 180 | ||||
| -rw-r--r-- | synapse/replication/tcp/commands.py | 137 | ||||
| -rw-r--r-- | synapse/replication/tcp/handler.py | 505 | ||||
| -rw-r--r-- | synapse/replication/tcp/protocol.py | 415 | ||||
| -rw-r--r-- | synapse/replication/tcp/redis.py | 181 | ||||
| -rw-r--r-- | synapse/replication/tcp/resource.py | 198 | ||||
| -rw-r--r-- | synapse/replication/tcp/streams/__init__.py | 71 | ||||
| -rw-r--r-- | synapse/replication/tcp/streams/_base.py | 506 | ||||
| -rw-r--r-- | synapse/replication/tcp/streams/events.py | 15 | ||||
| -rw-r--r-- | synapse/replication/tcp/streams/federation.py | 42 |
16 files changed, 1429 insertions, 984 deletions
diff --git a/synapse/replication/http/__init__.py b/synapse/replication/http/__init__.py index 28dbc6fcba..4613b2538c 100644 --- a/synapse/replication/http/__init__.py +++ b/synapse/replication/http/__init__.py @@ -21,6 +21,7 @@ from synapse.replication.http import ( membership, register, send_event, + streams, ) REPLICATION_PREFIX = "/_synapse/replication" @@ -38,3 +39,4 @@ class ReplicationRestResource(JsonResource): login.register_servlets(hs, self) register.register_servlets(hs, self) devices.register_servlets(hs, self) + streams.register_servlets(hs, self) diff --git a/synapse/replication/http/streams.py b/synapse/replication/http/streams.py new file mode 100644 index 0000000000..ffd4c61993 --- /dev/null +++ b/synapse/replication/http/streams.py @@ -0,0 +1,78 @@ +# -*- coding: utf-8 -*- +# Copyright 2020 The Matrix.org Foundation C.I.C. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import logging + +from synapse.api.errors import SynapseError +from synapse.http.servlet import parse_integer +from synapse.replication.http._base import ReplicationEndpoint + +logger = logging.getLogger(__name__) + + +class ReplicationGetStreamUpdates(ReplicationEndpoint): + """Fetches stream updates from a server. Used for streams not persisted to + the database, e.g. typing notifications. + + The API looks like: + + GET /_synapse/replication/get_repl_stream_updates/events?from_token=0&to_token=10&limit=100 + + 200 OK + + { + updates: [ ... ], + upto_token: 10, + limited: False, + } + + """ + + NAME = "get_repl_stream_updates" + PATH_ARGS = ("stream_name",) + METHOD = "GET" + + def __init__(self, hs): + super().__init__(hs) + + # We pull the streams from the replication steamer (if we try and make + # them ourselves we end up in an import loop). + self.streams = hs.get_replication_streamer().get_streams() + + @staticmethod + def _serialize_payload(stream_name, from_token, upto_token, limit): + return {"from_token": from_token, "upto_token": upto_token, "limit": limit} + + async def _handle_request(self, request, stream_name): + stream = self.streams.get(stream_name) + if stream is None: + raise SynapseError(400, "Unknown stream") + + from_token = parse_integer(request, "from_token", required=True) + upto_token = parse_integer(request, "upto_token", required=True) + limit = parse_integer(request, "limit", required=True) + + updates, upto_token, limited = await stream.get_updates_since( + from_token, upto_token, limit + ) + + return ( + 200, + {"updates": updates, "upto_token": upto_token, "limited": limited}, + ) + + +def register_servlets(hs, http_server): + ReplicationGetStreamUpdates(hs).register(http_server) diff --git a/synapse/replication/slave/storage/_base.py b/synapse/replication/slave/storage/_base.py index f45cbd37a0..751c799d94 100644 --- a/synapse/replication/slave/storage/_base.py +++ b/synapse/replication/slave/storage/_base.py @@ -18,8 +18,10 @@ from typing import Dict, Optional import six -from synapse.storage._base import SQLBaseStore -from synapse.storage.data_stores.main.cache import CURRENT_STATE_CACHE_NAME +from synapse.storage.data_stores.main.cache import ( + CURRENT_STATE_CACHE_NAME, + CacheInvalidationWorkerStore, +) from synapse.storage.database import Database from synapse.storage.engines import PostgresEngine @@ -35,7 +37,7 @@ def __func__(inp): return inp.__func__ -class BaseSlavedStore(SQLBaseStore): +class BaseSlavedStore(CacheInvalidationWorkerStore): def __init__(self, database: Database, db_conn, hs): super(BaseSlavedStore, self).__init__(database, db_conn, hs) if isinstance(self.database_engine, PostgresEngine): @@ -60,6 +62,12 @@ class BaseSlavedStore(SQLBaseStore): pos["caches"] = self._cache_id_gen.get_current_token() return pos + def get_cache_stream_token(self): + if self._cache_id_gen: + return self._cache_id_gen.get_current_token() + else: + return 0 + def process_replication_rows(self, stream_name, token, rows): if stream_name == "caches": if self._cache_id_gen: diff --git a/synapse/replication/slave/storage/devices.py b/synapse/replication/slave/storage/devices.py index 1c77687eea..23b1650e41 100644 --- a/synapse/replication/slave/storage/devices.py +++ b/synapse/replication/slave/storage/devices.py @@ -29,7 +29,13 @@ class SlavedDeviceStore(EndToEndKeyWorkerStore, DeviceWorkerStore, BaseSlavedSto self.hs = hs self._device_list_id_gen = SlavedIdTracker( - db_conn, "device_lists_stream", "stream_id" + db_conn, + "device_lists_stream", + "stream_id", + extra_tables=[ + ("user_signature_stream", "stream_id"), + ("device_lists_outbound_pokes", "stream_id"), + ], ) device_list_max = self._device_list_id_gen.get_current_token() self._device_list_stream_cache = StreamChangeCache( @@ -55,23 +61,27 @@ class SlavedDeviceStore(EndToEndKeyWorkerStore, DeviceWorkerStore, BaseSlavedSto def process_replication_rows(self, stream_name, token, rows): if stream_name == DeviceListsStream.NAME: self._device_list_id_gen.advance(token) - for row in rows: - self._invalidate_caches_for_devices(token, row.user_id, row.destination) + self._invalidate_caches_for_devices(token, rows) elif stream_name == UserSignatureStream.NAME: + self._device_list_id_gen.advance(token) for row in rows: self._user_signature_stream_cache.entity_has_changed(row.user_id, token) return super(SlavedDeviceStore, self).process_replication_rows( stream_name, token, rows ) - def _invalidate_caches_for_devices(self, token, user_id, destination): - self._device_list_stream_cache.entity_has_changed(user_id, token) - - if destination: - self._device_list_federation_stream_cache.entity_has_changed( - destination, token - ) + def _invalidate_caches_for_devices(self, token, rows): + for row in rows: + # The entities are either user IDs (starting with '@') whose devices + # have changed, or remote servers that we need to tell about + # changes. + if row.entity.startswith("@"): + self._device_list_stream_cache.entity_has_changed(row.entity, token) + self.get_cached_devices_for_user.invalidate((row.entity,)) + self._get_cached_user_device.invalidate_many((row.entity,)) + self.get_device_list_last_stream_id_for_remote.invalidate((row.entity,)) - self.get_cached_devices_for_user.invalidate((user_id,)) - self._get_cached_user_device.invalidate_many((user_id,)) - self.get_device_list_last_stream_id_for_remote.invalidate((user_id,)) + else: + self._device_list_federation_stream_cache.entity_has_changed( + row.entity, token + ) diff --git a/synapse/replication/slave/storage/pushers.py b/synapse/replication/slave/storage/pushers.py index f22c2d44a3..bce8a3d115 100644 --- a/synapse/replication/slave/storage/pushers.py +++ b/synapse/replication/slave/storage/pushers.py @@ -33,6 +33,9 @@ class SlavedPusherStore(PusherWorkerStore, BaseSlavedStore): result["pushers"] = self._pushers_id_gen.get_current_token() return result + def get_pushers_stream_token(self): + return self._pushers_id_gen.get_current_token() + def process_replication_rows(self, stream_name, token, rows): if stream_name == "pushers": self._pushers_id_gen.advance(token) diff --git a/synapse/replication/tcp/__init__.py b/synapse/replication/tcp/__init__.py index 81c2ea7ee9..523a1358d4 100644 --- a/synapse/replication/tcp/__init__.py +++ b/synapse/replication/tcp/__init__.py @@ -20,11 +20,31 @@ Further details can be found in docs/tcp_replication.rst Structure of the module: - * client.py - the client classes used for workers to connect to master + * handler.py - the classes used to handle sending/receiving commands to + replication * command.py - the definitions of all the valid commands - * protocol.py - contains bot the client and server protocol implementations, - these should not be used directly - * resource.py - the server classes that accepts and handle client connections - * streams.py - the definitons of all the valid streams + * protocol.py - the TCP protocol classes + * resource.py - handles streaming stream updates to replications + * streams/ - the definitons of all the valid streams + +The general interaction of the classes are: + + +---------------------+ + | ReplicationStreamer | + +---------------------+ + | + v + +---------------------------+ +----------------------+ + | ReplicationCommandHandler |---->|ReplicationDataHandler| + +---------------------------+ +----------------------+ + | ^ + v | + +-------------+ + | Protocols | + | (TCP/redis) | + +-------------+ + +Where the ReplicationDataHandler (or subclasses) handles incoming stream +updates. """ diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py index 02ab5b66ea..2d07b8b2d0 100644 --- a/synapse/replication/tcp/client.py +++ b/synapse/replication/tcp/client.py @@ -16,45 +16,40 @@ """ import logging -from typing import Dict, List, Optional +from typing import TYPE_CHECKING, Dict -from twisted.internet import defer from twisted.internet.protocol import ReconnectingClientFactory from synapse.replication.slave.storage._base import BaseSlavedStore -from synapse.replication.tcp.protocol import ( - AbstractReplicationClientHandler, - ClientReplicationStreamProtocol, -) - -from .commands import ( - Command, - FederationAckCommand, - InvalidateCacheCommand, - RemoteServerUpCommand, - RemovePusherCommand, - UserIpCommand, - UserSyncCommand, -) +from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol + +if TYPE_CHECKING: + from synapse.server import HomeServer + from synapse.replication.tcp.handler import ReplicationCommandHandler logger = logging.getLogger(__name__) -class ReplicationClientFactory(ReconnectingClientFactory): +class DirectTcpReplicationClientFactory(ReconnectingClientFactory): """Factory for building connections to the master. Will reconnect if the connection is lost. - Accepts a handler that will be called when new data is available or data - is required. + Accepts a handler that is passed to `ClientReplicationStreamProtocol`. """ initialDelay = 0.1 maxDelay = 1 # Try at least once every N seconds - def __init__(self, hs, client_name, handler: AbstractReplicationClientHandler): + def __init__( + self, + hs: "HomeServer", + client_name: str, + command_handler: "ReplicationCommandHandler", + ): self.client_name = client_name - self.handler = handler + self.command_handler = command_handler self.server_name = hs.config.server_name + self.hs = hs self._clock = hs.get_clock() # As self.clock is defined in super class hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.stopTrying) @@ -65,7 +60,11 @@ class ReplicationClientFactory(ReconnectingClientFactory): def buildProtocol(self, addr): logger.info("Connected to replication: %r", addr) return ClientReplicationStreamProtocol( - self.client_name, self.server_name, self._clock, self.handler + self.hs, + self.client_name, + self.server_name, + self._clock, + self.command_handler, ) def clientConnectionLost(self, connector, reason): @@ -77,41 +76,17 @@ class ReplicationClientFactory(ReconnectingClientFactory): ReconnectingClientFactory.clientConnectionFailed(self, connector, reason) -class ReplicationClientHandler(AbstractReplicationClientHandler): - """A base handler that can be passed to the ReplicationClientFactory. +class ReplicationDataHandler: + """Handles incoming stream updates from replication. - By default proxies incoming replication data to the SlaveStore. + This instance notifies the slave data store about updates. Can be subclassed + to handle updates in additional ways. """ def __init__(self, store: BaseSlavedStore): self.store = store - # The current connection. None if we are currently (re)connecting - self.connection = None - - # Any pending commands to be sent once a new connection has been - # established - self.pending_commands = [] # type: List[Command] - - # Map from string -> deferred, to wake up when receiveing a SYNC with - # the given string. - # Used for tests. - self.awaiting_syncs = {} # type: Dict[str, defer.Deferred] - - # The factory used to create connections. - self.factory = None # type: Optional[ReplicationClientFactory] - - def start_replication(self, hs): - """Helper method to start a replication connection to the remote server - using TCP. - """ - client_name = hs.config.worker_name - self.factory = ReplicationClientFactory(hs, client_name, self) - host = hs.config.worker_replication_host - port = hs.config.worker_replication_port - hs.get_reactor().connectTCP(host, port, self.factory) - - async def on_rdata(self, stream_name, token, rows): + async def on_rdata(self, stream_name: str, token: int, rows: list): """Called to handle a batch of replication data with a given stream token. By default this just pokes the slave store. Can be overridden in subclasses to @@ -123,30 +98,8 @@ class ReplicationClientHandler(AbstractReplicationClientHandler): rows (list): a list of Stream.ROW_TYPE objects as returned by Stream.parse_row. """ - logger.debug("Received rdata %s -> %s", stream_name, token) self.store.process_replication_rows(stream_name, token, rows) - async def on_position(self, stream_name, token): - """Called when we get new position data. By default this just pokes - the slave store. - - Can be overriden in subclasses to handle more. - """ - self.store.process_replication_rows(stream_name, token, []) - - def on_sync(self, data): - """When we received a SYNC we wake up any deferreds that were waiting - for the sync with the given data. - - Used by tests. - """ - d = self.awaiting_syncs.pop(data, None) - if d: - d.callback(data) - - def on_remote_server_up(self, server: str): - """Called when get a new REMOTE_SERVER_UP command.""" - def get_streams_to_replicate(self) -> Dict[str, int]: """Called when a new connection has been established and we need to subscribe to streams. @@ -162,83 +115,10 @@ class ReplicationClientHandler(AbstractReplicationClientHandler): args["account_data"] = user_account_data elif room_account_data: args["account_data"] = room_account_data - return args - 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. (Overriden by the synchrotron's only) - """ - return [] - - def send_command(self, cmd): - """Send a command to master (when we get establish a connection if we - don't have one already.) - """ - if self.connection: - self.connection.send_command(cmd) - else: - logger.warning("Queuing command as not connected: %r", cmd.NAME) - self.pending_commands.append(cmd) - - def send_federation_ack(self, token): - """Ack data for the federation stream. This allows the master to drop - data stored purely in memory. - """ - self.send_command(FederationAckCommand(token)) - - def send_user_sync(self, user_id, is_syncing, last_sync_ms): - """Poke the master that a user has started/stopped syncing. - """ - self.send_command(UserSyncCommand(user_id, is_syncing, last_sync_ms)) - - def send_remove_pusher(self, app_id, push_key, user_id): - """Poke the master to remove a pusher for a user - """ - cmd = RemovePusherCommand(app_id, push_key, user_id) - self.send_command(cmd) - - def send_invalidate_cache(self, cache_func, keys): - """Poke the master to invalidate a cache. - """ - cmd = InvalidateCacheCommand(cache_func.__name__, keys) - self.send_command(cmd) - - def send_user_ip(self, user_id, access_token, ip, user_agent, device_id, last_seen): - """Tell the master that the user made a request. - """ - cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen) - self.send_command(cmd) - - def send_remote_server_up(self, server: str): - self.send_command(RemoteServerUpCommand(server)) - - def await_sync(self, data): - """Returns a deferred that is resolved when we receive a SYNC command - with given data. - - [Not currently] used by tests. - """ - return self.awaiting_syncs.setdefault(data, defer.Deferred()) - - def update_connection(self, connection): - """Called when a connection has been established (or lost with None). - """ - self.connection = connection - if connection: - for cmd in self.pending_commands: - connection.send_command(cmd) - self.pending_commands = [] - - 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") + async def on_position(self, stream_name: str, token: int): + self.store.process_replication_rows(stream_name, token, []) - # We don't reset the delay any earlier as otherwise if there is a - # problem during start up we'll end up tight looping connecting to the - # server. - if self.factory: - self.factory.resetDelay() + def on_remote_server_up(self, server: str): + """Called when get a new REMOTE_SERVER_UP command.""" diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py index 451671412d..f26aee83cb 100644 --- a/synapse/replication/tcp/commands.py +++ b/synapse/replication/tcp/commands.py @@ -17,7 +17,7 @@ The VALID_SERVER_COMMANDS and VALID_CLIENT_COMMANDS define which commands are allowed to be sent by which side. """ - +import abc import logging import platform from typing import Tuple, Type @@ -34,34 +34,29 @@ else: logger = logging.getLogger(__name__) -class Command(object): +class Command(metaclass=abc.ABCMeta): """The base command class. All subclasses must set the NAME variable which equates to the name of the command on the wire. A full command line on the wire is constructed from `NAME + " " + to_line()` - - The default implementation creates a command of form `<NAME> <data>` """ NAME = None # type: str - def __init__(self, data): - self.data = data - @classmethod + @abc.abstractmethod def from_line(cls, line): """Deserialises a line from the wire into this command. `line` does not include the command. """ - return cls(line) - def to_line(self): + @abc.abstractmethod + def to_line(self) -> str: """Serialises the comamnd for the wire. Does not include the command prefix. """ - return self.data def get_logcontext_id(self): """Get a suitable string for the logcontext when processing this command""" @@ -70,7 +65,21 @@ class Command(object): return self.NAME -class ServerCommand(Command): +class _SimpleCommand(Command): + """An implementation of Command whose argument is just a 'data' string.""" + + def __init__(self, data): + self.data = data + + @classmethod + def from_line(cls, line): + return cls(line) + + def to_line(self) -> str: + return self.data + + +class ServerCommand(_SimpleCommand): """Sent by the server on new connection and includes the server_name. Format:: @@ -136,8 +145,8 @@ class PositionCommand(Command): """Sent by the server to tell the client the stream postition without needing to send an RDATA. - Sent to the client after all missing updates for a stream have been sent - to the client and they're now up to date. + On receipt of a POSITION command clients should check if they have missed + any updates, and if so then fetch them out of band. """ NAME = "POSITION" @@ -155,7 +164,7 @@ class PositionCommand(Command): return " ".join((self.stream_name, str(self.token))) -class ErrorCommand(Command): +class ErrorCommand(_SimpleCommand): """Sent by either side if there was an ERROR. The data is a string describing the error. """ @@ -163,14 +172,14 @@ class ErrorCommand(Command): NAME = "ERROR" -class PingCommand(Command): +class PingCommand(_SimpleCommand): """Sent by either side as a keep alive. The data is arbitary (often timestamp) """ NAME = "PING" -class NameCommand(Command): +class NameCommand(_SimpleCommand): """Sent by client to inform the server of the client's identity. The data is the name """ @@ -179,42 +188,24 @@ class NameCommand(Command): class ReplicateCommand(Command): - """Sent by the client to subscribe to the stream. + """Sent by the client to subscribe to streams. Format:: - REPLICATE <stream_name> <token> - - Where <token> may be either: - * a numeric stream_id to stream updates from - * "NOW" to stream all subsequent updates. - - The <stream_name> can be "ALL" to subscribe to all known streams, in which - case the <token> must be set to "NOW", i.e.:: - - REPLICATE ALL NOW + REPLICATE """ NAME = "REPLICATE" - def __init__(self, stream_name, token): - self.stream_name = stream_name - self.token = token + def __init__(self): + pass @classmethod def from_line(cls, line): - stream_name, token = line.split(" ", 1) - if token in ("NOW", "now"): - token = "NOW" - else: - token = int(token) - return cls(stream_name, token) + return cls() def to_line(self): - return " ".join((self.stream_name, str(self.token))) - - def get_logcontext_id(self): - return "REPLICATE-" + self.stream_name + return "" class UserSyncCommand(Command): @@ -225,30 +216,32 @@ class UserSyncCommand(Command): Format:: - USER_SYNC <user_id> <state> <last_sync_ms> + USER_SYNC <instance_id> <user_id> <state> <last_sync_ms> Where <state> is either "start" or "stop" """ NAME = "USER_SYNC" - def __init__(self, user_id, is_syncing, last_sync_ms): + def __init__(self, instance_id, user_id, is_syncing, last_sync_ms): + self.instance_id = instance_id self.user_id = user_id self.is_syncing = is_syncing self.last_sync_ms = last_sync_ms @classmethod def from_line(cls, line): - user_id, state, last_sync_ms = line.split(" ", 2) + instance_id, user_id, state, last_sync_ms = line.split(" ", 3) if state not in ("start", "end"): raise Exception("Invalid USER_SYNC state %r" % (state,)) - return cls(user_id, state == "start", int(last_sync_ms)) + return cls(instance_id, user_id, state == "start", int(last_sync_ms)) def to_line(self): return " ".join( ( + self.instance_id, self.user_id, "start" if self.is_syncing else "end", str(self.last_sync_ms), @@ -256,6 +249,30 @@ class UserSyncCommand(Command): ) +class ClearUserSyncsCommand(Command): + """Sent by the client to inform the server that it should drop all + information about syncing users sent by the client. + + Mainly used when client is about to shut down. + + Format:: + + CLEAR_USER_SYNC <instance_id> + """ + + NAME = "CLEAR_USER_SYNC" + + def __init__(self, instance_id): + self.instance_id = instance_id + + @classmethod + def from_line(cls, line): + return cls(line) + + def to_line(self): + return self.instance_id + + class FederationAckCommand(Command): """Sent by the client when it has processed up to a given point in the federation stream. This allows the master to drop in-memory caches of the @@ -281,14 +298,6 @@ class FederationAckCommand(Command): return str(self.token) -class SyncCommand(Command): - """Used for testing. The client protocol implementation allows waiting - on a SYNC command with a specified data. - """ - - NAME = "SYNC" - - class RemovePusherCommand(Command): """Sent by the client to request the master remove the given pusher. @@ -387,7 +396,7 @@ class UserIpCommand(Command): ) -class RemoteServerUpCommand(Command): +class RemoteServerUpCommand(_SimpleCommand): """Sent when a worker has detected that a remote server is no longer "down" and retry timings should be reset. @@ -411,11 +420,11 @@ _COMMANDS = ( ReplicateCommand, UserSyncCommand, FederationAckCommand, - SyncCommand, RemovePusherCommand, InvalidateCacheCommand, UserIpCommand, RemoteServerUpCommand, + ClearUserSyncsCommand, ) # type: Tuple[Type[Command], ...] # Map of command name to command type. @@ -428,7 +437,6 @@ VALID_SERVER_COMMANDS = ( PositionCommand.NAME, ErrorCommand.NAME, PingCommand.NAME, - SyncCommand.NAME, RemoteServerUpCommand.NAME, ) @@ -438,6 +446,7 @@ VALID_CLIENT_COMMANDS = ( ReplicateCommand.NAME, PingCommand.NAME, UserSyncCommand.NAME, + ClearUserSyncsCommand.NAME, FederationAckCommand.NAME, RemovePusherCommand.NAME, InvalidateCacheCommand.NAME, @@ -445,3 +454,21 @@ VALID_CLIENT_COMMANDS = ( ErrorCommand.NAME, RemoteServerUpCommand.NAME, ) + + +def parse_command_from_line(line: str) -> Command: + """Parses a command from a received line. + + Line should already be stripped of whitespace and be checked if blank. + """ + + idx = line.find(" ") + if idx >= 0: + cmd_name = line[:idx] + rest_of_line = line[idx + 1 :] + else: + cmd_name = line + rest_of_line = "" + + cmd_cls = COMMAND_MAP[cmd_name] + return cmd_cls.from_line(rest_of_line) diff --git a/synapse/replication/tcp/handler.py b/synapse/replication/tcp/handler.py new file mode 100644 index 0000000000..5b5ee2c13e --- /dev/null +++ b/synapse/replication/tcp/handler.py @@ -0,0 +1,505 @@ +# -*- coding: utf-8 -*- +# Copyright 2017 Vector Creations Ltd +# Copyright 2020 The Matrix.org Foundation C.I.C. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import logging +from typing import ( + Any, + Callable, + Dict, + Iterable, + Iterator, + List, + Optional, + Set, + Tuple, + TypeVar, +) + +from prometheus_client import Counter + +from twisted.internet.protocol import ReconnectingClientFactory + +from synapse.metrics import LaterGauge +from synapse.replication.tcp.client import DirectTcpReplicationClientFactory +from synapse.replication.tcp.commands import ( + ClearUserSyncsCommand, + Command, + FederationAckCommand, + InvalidateCacheCommand, + PositionCommand, + RdataCommand, + RemoteServerUpCommand, + RemovePusherCommand, + ReplicateCommand, + 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 + +logger = logging.getLogger(__name__) + + +# number of updates received for each RDATA stream +inbound_rdata_count = Counter( + "synapse_replication_tcp_protocol_inbound_rdata_count", "", ["stream_name"] +) +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: + """Handles incoming commands from replication as well as sending commands + back out to connections. + """ + + def __init__(self, hs): + self._replication_data_handler = hs.get_replication_data_handler() + self._presence_handler = hs.get_presence_handler() + 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] + + self._streams = { + stream.NAME: stream(hs) for stream in STREAMS_MAP.values() + } # type: Dict[str, Stream] + + self._position_linearizer = Linearizer("replication_position") + + # Map of stream to batched updates. See RdataCommand for info on how + # batching works. + self._pending_batches = {} # type: Dict[str, List[Any]] + + # The factory used to create connections. + self._factory = None # type: Optional[ReconnectingClientFactory] + + # 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 + using TCP. + """ + if hs.config.redis.redis_enabled: + from synapse.replication.tcp.redis import ( + RedisDirectTcpReplicationClientFactory, + ) + import txredisapi + + logger.info( + "Connecting to redis (host=%r port=%r DBID=%r)", + hs.config.redis_host, + hs.config.redis_port, + hs.config.redis_dbid, + ) + + # We need two connections to redis, one for the subscription stream and + # one to send commands to (as you can't send further redis commands to a + # connection after SUBSCRIBE is called). + + # First create the connection for sending commands. + outbound_redis_connection = txredisapi.lazyConnection( + host=hs.config.redis_host, + port=hs.config.redis_port, + dbid=hs.config.redis_dbid, + password=hs.config.redis.redis_password, + reconnect=True, + ) + + # Now create the factory/connection for the subscription stream. + self._factory = RedisDirectTcpReplicationClientFactory( + hs, outbound_redis_connection + ) + hs.get_reactor().connectTCP( + hs.config.redis.redis_host, hs.config.redis.redis_port, self._factory, + ) + else: + client_name = hs.config.worker_name + self._factory = DirectTcpReplicationClientFactory(hs, client_name, self) + host = hs.config.worker_replication_host + port = hs.config.worker_replication_port + hs.get_reactor().connectTCP(host, port, self._factory) + + async def on_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() + + try: + row = STREAMS_MAP[stream_name].parse_row(cmd.row) + except Exception: + logger.exception("Failed to parse RDATA: %r %r", stream_name, cmd.row) + raise + + # We linearize here for two reasons: + # 1. so we don't try and concurrently handle multiple rows for the + # same stream, and + # 2. so we don't race with getting a POSITION command and fetching + # missing RDATA. + with await self._position_linearizer.queue(cmd.stream_name): + if stream_name not in self._streams_connected: + # If the stream isn't marked as connected then we haven't seen a + # `POSITION` command yet, and so we may have missed some rows. + # Let's drop the row for now, on the assumption we'll receive a + # `POSITION` soon and we'll catch up correctly then. + logger.warning( + "Discarding RDATA for unconnected stream %s -> %s", + stream_name, + cmd.token, + ) + return + + if cmd.token is None: + # I.e. this is part of a batch of updates for this stream (in + # which case batch until we get an update for the stream with a non + # None token). + self._pending_batches.setdefault(stream_name, []).append(row) + else: + # Check if this is the last of a batch of updates + rows = self._pending_batches.pop(stream_name, []) + rows.append(row) + await self.on_rdata(stream_name, cmd.token, rows) + + async def on_rdata(self, stream_name: str, token: int, rows: list): + """Called to handle a batch of replication data with a given stream token. + + Args: + stream_name: name of the replication stream for this batch of rows + token: stream token for this batch of rows + rows: a list of Stream.ROW_TYPE objects as returned by + Stream.parse_row. + """ + logger.debug("Received rdata %s -> %s", stream_name, token) + await self._replication_data_handler.on_rdata(stream_name, token, rows) + + async def on_POSITION(self, cmd: PositionCommand): + stream = self._streams.get(cmd.stream_name) + if not stream: + logger.error("Got POSITION for unknown stream: %s", cmd.stream_name) + return + + # We protect catching up with a linearizer in case the replication + # connection reconnects under us. + with await self._position_linearizer.queue(cmd.stream_name): + # We're about to go and catch up with the stream, so remove from set + # of connected streams. + self._streams_connected.discard(cmd.stream_name) + + # We clear the pending batches for the stream as the fetching of the + # missing updates below will fetch all rows in the batch. + self._pending_batches.pop(cmd.stream_name, []) + + # Find where we previously streamed up to. + current_token = self._replication_data_handler.get_streams_to_replicate().get( + cmd.stream_name + ) + if current_token is None: + logger.warning( + "Got POSITION for stream we're not subscribed to: %s", + cmd.stream_name, + ) + return + + # If the position token matches our current token then we're up to + # date and there's nothing to do. Otherwise, fetch all updates + # between then and now. + missing_updates = cmd.token != current_token + while missing_updates: + ( + updates, + current_token, + missing_updates, + ) = await stream.get_updates_since(current_token, cmd.token) + + # TODO: add some tests for this + + # Some streams return multiple rows with the same stream IDs, + # which need to be processed in batches. + + for token, rows in _batch_updates(updates): + await self.on_rdata( + cmd.stream_name, token, [stream.parse_row(row) for row in rows], + ) + + # We've now caught up to position sent to us, notify handler. + await self._replication_data_handler.on_position(cmd.stream_name, cmd.token) + + self._streams_connected.add(cmd.stream_name) + + async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand): + """"Called when get a new REMOTE_SERVER_UP command.""" + self._replication_data_handler.on_remote_server_up(cmd.data) + + 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 + currently syncing users. + """ + return self._presence_handler.get_currently_syncing_users() + + def new_connection(self, connection: AbstractConnection): + """Called when we have a new connection. + """ + self._connections.append(connection) + + # 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() + + # 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. + """ + 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) + + def send_federation_ack(self, token: int): + """Ack data for the federation stream. This allows the master to drop + data stored purely in memory. + """ + self.send_command(FederationAckCommand(token)) + + def send_user_sync( + self, instance_id: str, user_id: str, is_syncing: bool, last_sync_ms: int + ): + """Poke the master that a user has started/stopped syncing. + """ + self.send_command( + UserSyncCommand(instance_id, user_id, is_syncing, last_sync_ms) + ) + + def send_remove_pusher(self, app_id: str, push_key: str, user_id: str): + """Poke the master to remove a pusher for a user + """ + cmd = RemovePusherCommand(app_id, push_key, user_id) + self.send_command(cmd) + + def send_invalidate_cache(self, cache_func: Callable, keys: tuple): + """Poke the master to invalidate a cache. + """ + cmd = InvalidateCacheCommand(cache_func.__name__, keys) + self.send_command(cmd) + + def send_user_ip( + self, + user_id: str, + access_token: str, + ip: str, + user_agent: str, + device_id: str, + last_seen: int, + ): + """Tell the master that the user made a request. + """ + cmd = UserIpCommand(user_id, access_token, ip, user_agent, device_id, last_seen) + self.send_command(cmd) + + def send_remote_server_up(self, server: str): + self.send_command(RemoteServerUpCommand(server)) + + 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)) + + +UpdateToken = TypeVar("UpdateToken") +UpdateRow = TypeVar("UpdateRow") + + +def _batch_updates( + updates: Iterable[Tuple[UpdateToken, UpdateRow]] +) -> Iterator[Tuple[UpdateToken, List[UpdateRow]]]: + """Collect stream updates with the same token together + + Given a series of updates returned by Stream.get_updates_since(), collects + the updates which share the same stream_id together. + + For example: + + [(1, a), (1, b), (2, c), (3, d), (3, e)] + + becomes: + + [ + (1, [a, b]), + (2, [c]), + (3, [d, e]), + ] + """ + + update_iter = iter(updates) + + first_update = next(update_iter, None) + if first_update is None: + # empty input + return + + current_batch_token = first_update[0] + current_batch = [first_update[1]] + + for token, row in update_iter: + if token != current_batch_token: + # different token to the previous row: flush the previous + # batch and start anew + yield current_batch_token, current_batch + current_batch_token = token + current_batch = [] + + current_batch.append(row) + + # flush the final batch + yield current_batch_token, current_batch 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"] -) diff --git a/synapse/replication/tcp/redis.py b/synapse/replication/tcp/redis.py new file mode 100644 index 0000000000..4c08425735 --- /dev/null +++ b/synapse/replication/tcp/redis.py @@ -0,0 +1,181 @@ +# -*- coding: utf-8 -*- +# Copyright 2020 The Matrix.org Foundation C.I.C. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import logging +from typing import TYPE_CHECKING + +import txredisapi + +from synapse.logging.context import PreserveLoggingContext +from synapse.metrics.background_process_metrics import run_as_background_process +from synapse.replication.tcp.commands import ( + Command, + ReplicateCommand, + parse_command_from_line, +) +from synapse.replication.tcp.protocol import AbstractConnection + +if TYPE_CHECKING: + from synapse.replication.tcp.handler import ReplicationCommandHandler + from synapse.server import HomeServer + +logger = logging.getLogger(__name__) + + +class RedisSubscriber(txredisapi.SubscriberProtocol, AbstractConnection): + """Connection to redis subscribed to replication stream. + + Parses incoming messages from redis into replication commands, and passes + them to `ReplicationCommandHandler` + + Due to the vagaries of `txredisapi` we don't want to have a custom + constructor, so instead we expect the defined attributes below to be set + immediately after initialisation. + + Attributes: + handler: The command handler to handle incoming commands. + stream_name: The *redis* stream name to subscribe to (not anything to + do with Synapse replication streams). + outbound_redis_connection: The connection to redis to use to send + commands. + """ + + handler = None # type: ReplicationCommandHandler + stream_name = None # type: str + outbound_redis_connection = None # type: txredisapi.RedisProtocol + + def connectionMade(self): + logger.info("Connected to redis instance") + self.subscribe(self.stream_name) + self.send_command(ReplicateCommand()) + + self.handler.new_connection(self) + + def messageReceived(self, pattern: str, channel: str, message: str): + """Received a message from redis. + """ + + if message.strip() == "": + # Ignore blank lines + return + + try: + cmd = parse_command_from_line(message) + except Exception: + logger.exception( + "[%s] failed to parse line: %r", message, + ) + return + + # Now lets try and call on_<CMD_NAME> function + run_as_background_process( + "replication-" + cmd.get_logcontext_id(), self.handle_command, cmd + ) + + 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. + + Args: + cmd: received command + """ + handled = False + + # First call any command handlers on this instance. These are for redis + # 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) + + def connectionLost(self, reason): + logger.info("Lost connection to redis instance") + self.handler.lost_connection(self) + + def send_command(self, cmd: Command): + """Send a command if connection has been established. + + Args: + cmd (Command) + """ + string = "%s %s" % (cmd.NAME, cmd.to_line()) + if "\n" in string: + raise Exception("Unexpected newline in command: %r", string) + + encoded_string = string.encode("utf-8") + + async def _send(): + with PreserveLoggingContext(): + # Note that we use the other connection as we can't send + # commands using the subscription connection. + await self.outbound_redis_connection.publish( + self.stream_name, encoded_string + ) + + run_as_background_process("send-cmd", _send) + + +class RedisDirectTcpReplicationClientFactory(txredisapi.SubscriberFactory): + """This is a reconnecting factory that connects to redis and immediately + subscribes to a stream. + + Args: + hs + outbound_redis_connection: A connection to redis that will be used to + send outbound commands (this is seperate to the redis connection + used to subscribe). + """ + + maxDelay = 5 + continueTrying = True + protocol = RedisSubscriber + + def __init__( + self, hs: "HomeServer", outbound_redis_connection: txredisapi.RedisProtocol + ): + + super().__init__() + + # This sets the password on the RedisFactory base class (as + # SubscriberFactory constructor doesn't pass it through). + self.password = hs.config.redis.redis_password + + self.handler = hs.get_tcp_replication() + self.stream_name = hs.hostname + + self.outbound_redis_connection = outbound_redis_connection + + def buildProtocol(self, addr): + p = super().buildProtocol(addr) # type: RedisSubscriber + + # We do this here rather than add to the constructor of `RedisSubcriber` + # as to do so would involve overriding `buildProtocol` entirely, however + # the base method does some other things than just instantiating the + # protocol. + p.handler = self.handler + p.outbound_redis_connection = self.outbound_redis_connection + p.stream_name = self.stream_name + + return p diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py index ce9d1fae12..b2d6baa2a2 100644 --- a/synapse/replication/tcp/resource.py +++ b/synapse/replication/tcp/resource.py @@ -17,7 +17,7 @@ import logging import random -from typing import Any, 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 -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 = ReplicationStreamer(hs) + 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. @@ -99,39 +89,22 @@ class ReplicationStreamer(object): self.streams_by_name = {stream.NAME: stream for stream in self.streams} - LaterGauge( - "synapse_replication_tcp_resource_connections_per_stream", - "", - ["stream_name"], - lambda: { - (stream_name,): len( - [ - conn - for conn in self.connections - if stream_name in conn.replication_streams - ] - ) - for stream_name in self.streams_by_name - }, - ) - self.federation_sender = None if not hs.config.send_federation: 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) + self.command_handler = hs.get_tcp_replication() - def on_shutdown(self): - # close all connections on shutdown - for conn in self.connections: - conn.send_error("server shutting down") + def get_streams(self) -> Dict[str, Stream]: + """Get a mapp from stream name to stream instance. + """ + return self.streams_by_name def on_notifier_poke(self): """Checks if there is actually any new data and sends it to the @@ -140,7 +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: @@ -166,11 +139,6 @@ class ReplicationStreamer(object): self.pending_updates = False with Measure(self.clock, "repl.stream.get_updates"): - # First we tell the streams that they should update their - # current tokens. - for stream in self.streams: - stream.advance_current_token() - all_streams = self.streams if self._replication_torture_level is not None: @@ -180,7 +148,7 @@ class ReplicationStreamer(object): random.shuffle(all_streams) for stream in all_streams: - if stream.last_token == stream.upto_token: + if stream.last_token == stream.current_token(): continue if self._replication_torture_level: @@ -192,18 +160,17 @@ class ReplicationStreamer(object): "Getting stream: %s: %s -> %s", stream.NAME, stream.last_token, - stream.upto_token, + stream.current_token(), ) try: - updates, current_token = await stream.get_updates() + updates, current_token, limited = await stream.get_updates() + self.pending_updates |= limited except Exception: logger.info("Failed to handle stream %s", stream.NAME) raise logger.debug( - "Sending %d updates to %d connections", - len(updates), - len(self.connections), + "Sending %d updates", len(updates), ) if updates: @@ -219,116 +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 - @measure_func("repl.get_stream_updates") - async def get_stream_updates(self, stream_name, token): - """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 await stream.get_updates_since(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, conn_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( - conn_id, user_id, is_syncing, last_sync_ms - ) - - @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 - - # We need to tell the presence handler that the connection has been - # lost so that it can handle any ongoing syncs on that connection. - run_as_background_process( - "update_external_syncs_clear", - self.presence_handler.update_external_syncs_clear, - connection.conn_id, - ) - def _batch_updates(updates): """Takes a list of updates of form [(token, row)] and sets the token to diff --git a/synapse/replication/tcp/streams/__init__.py b/synapse/replication/tcp/streams/__init__.py index 5f52264e84..d1a61c3314 100644 --- a/synapse/replication/tcp/streams/__init__.py +++ b/synapse/replication/tcp/streams/__init__.py @@ -25,26 +25,63 @@ Each stream is defined by the following information: update_function: The function that returns a list of updates between two tokens """ -from . import _base, events, federation +from synapse.replication.tcp.streams._base import ( + AccountDataStream, + BackfillStream, + CachesStream, + DeviceListsStream, + GroupServerStream, + PresenceStream, + PublicRoomsStream, + PushersStream, + PushRulesStream, + ReceiptsStream, + Stream, + TagAccountDataStream, + ToDeviceStream, + TypingStream, + UserSignatureStream, +) +from synapse.replication.tcp.streams.events import EventsStream +from synapse.replication.tcp.streams.federation import FederationStream STREAMS_MAP = { stream.NAME: stream for stream in ( - events.EventsStream, - _base.BackfillStream, - _base.PresenceStream, - _base.TypingStream, - _base.ReceiptsStream, - _base.PushRulesStream, - _base.PushersStream, - _base.CachesStream, - _base.PublicRoomsStream, - _base.DeviceListsStream, - _base.ToDeviceStream, - federation.FederationStream, - _base.TagAccountDataStream, - _base.AccountDataStream, - _base.GroupServerStream, - _base.UserSignatureStream, + EventsStream, + BackfillStream, + PresenceStream, + TypingStream, + ReceiptsStream, + PushRulesStream, + PushersStream, + CachesStream, + PublicRoomsStream, + DeviceListsStream, + ToDeviceStream, + FederationStream, + TagAccountDataStream, + AccountDataStream, + GroupServerStream, + UserSignatureStream, ) } + +__all__ = [ + "STREAMS_MAP", + "Stream", + "BackfillStream", + "PresenceStream", + "TypingStream", + "ReceiptsStream", + "PushRulesStream", + "PushersStream", + "CachesStream", + "PublicRoomsStream", + "DeviceListsStream", + "ToDeviceStream", + "TagAccountDataStream", + "AccountDataStream", + "GroupServerStream", + "UserSignatureStream", +] diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py index 208e8a667b..a860072ccf 100644 --- a/synapse/replication/tcp/streams/_base.py +++ b/synapse/replication/tcp/streams/_base.py @@ -14,117 +14,66 @@ # See the License for the specific language governing permissions and # limitations under the License. -import itertools import logging from collections import namedtuple -from typing import Any, List, Optional +from typing import Any, Awaitable, Callable, Iterable, List, Optional, Tuple import attr +from synapse.replication.http.streams import ReplicationGetStreamUpdates + logger = logging.getLogger(__name__) MAX_EVENTS_BEHIND = 500000 -BackfillStreamRow = namedtuple( - "BackfillStreamRow", - ( - "event_id", # str - "room_id", # str - "type", # str - "state_key", # str, optional - "redacts", # str, optional - "relates_to", # str, optional - ), -) -PresenceStreamRow = namedtuple( - "PresenceStreamRow", - ( - "user_id", # str - "state", # str - "last_active_ts", # int - "last_federation_update_ts", # int - "last_user_sync_ts", # int - "status_msg", # str - "currently_active", # bool - ), -) -TypingStreamRow = namedtuple( - "TypingStreamRow", ("room_id", "user_ids") # str # list(str) -) -ReceiptsStreamRow = namedtuple( - "ReceiptsStreamRow", - ( - "room_id", # str - "receipt_type", # str - "user_id", # str - "event_id", # str - "data", # dict - ), -) -PushRulesStreamRow = namedtuple("PushRulesStreamRow", ("user_id",)) # str -PushersStreamRow = namedtuple( - "PushersStreamRow", - ("user_id", "app_id", "pushkey", "deleted"), # str # str # str # bool -) - - -@attr.s -class CachesStreamRow: - """Stream to inform workers they should invalidate their cache. - - Attributes: - cache_func: Name of the cached function. - keys: The entry in the cache to invalidate. If None then will - invalidate all. - invalidation_ts: Timestamp of when the invalidation took place. - """ - cache_func = attr.ib(type=str) - keys = attr.ib(type=Optional[List[Any]]) - invalidation_ts = attr.ib(type=int) - - -PublicRoomsStreamRow = namedtuple( - "PublicRoomsStreamRow", - ( - "room_id", # str - "visibility", # str - "appservice_id", # str, optional - "network_id", # str, optional - ), -) -DeviceListsStreamRow = namedtuple( - "DeviceListsStreamRow", ("user_id", "destination") # str # str -) -ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", ("entity",)) # str -TagAccountDataStreamRow = namedtuple( - "TagAccountDataStreamRow", ("user_id", "room_id", "data") # str # str # dict -) -AccountDataStreamRow = namedtuple( - "AccountDataStream", ("user_id", "room_id", "data_type") # str # str # str -) -GroupsStreamRow = namedtuple( - "GroupsStreamRow", - ("group_id", "user_id", "type", "content"), # str # str # str # dict -) -UserSignatureStreamRow = namedtuple("UserSignatureStreamRow", ("user_id")) # str +# Some type aliases to make things a bit easier. + +# A stream position token +Token = int + +# The type of a stream update row, after JSON deserialisation, but before +# parsing with Stream.parse_row (which turns it into a `ROW_TYPE`). Normally it's +# just a row from a database query, though this is dependent on the stream in question. +# +StreamRow = Tuple + +# The type returned by the update_function of a stream, as well as get_updates(), +# get_updates_since, etc. +# +# It consists of a triplet `(updates, new_last_token, limited)`, where: +# * `updates` is a list of `(token, row)` entries. +# * `new_last_token` is the new position in stream. +# * `limited` is whether there are more updates to fetch. +# +StreamUpdateResult = Tuple[List[Tuple[Token, StreamRow]], Token, bool] + +# The type of an update_function for a stream +# +# The arguments are: +# +# * from_token: the previous stream token: the starting point for fetching the +# updates +# * to_token: the new stream token: the point to get updates up to +# * limit: the maximum number of rows to return +# +UpdateFunction = Callable[[Token, Token, int], Awaitable[StreamUpdateResult]] class Stream(object): """Base class for the streams. Provides a `get_updates()` function that returns new updates since the last - time it was called up until the point `advance_current_token` was called. + time it was called. """ NAME = None # type: str # The name of the stream # The type of the row. Used by the default impl of parse_row. ROW_TYPE = None # type: Any - _LIMITED = True # Whether the update function takes a limit @classmethod - def parse_row(cls, row): + def parse_row(cls, row: StreamRow): """Parse a row received over replication By default, assumes that the row data is an array object and passes its contents @@ -138,101 +87,120 @@ class Stream(object): """ return cls.ROW_TYPE(*row) - def __init__(self, hs): - # The token from which we last asked for updates - self.last_token = self.current_token() + def __init__( + self, + current_token_function: Callable[[], Token], + update_function: UpdateFunction, + ): + """Instantiate a Stream - # The token that we will get updates up to - self.upto_token = self.current_token() + current_token_function and update_function are callbacks which should be + implemented by subclasses. - def advance_current_token(self): - """Updates `upto_token` to "now", which updates up until which point - get_updates[_since] will fetch rows till. + current_token_function is called to get the current token of the underlying + stream. + + update_function is called to get updates for this stream between a pair of + stream tokens. See the UpdateFunction type definition for more info. + + Args: + current_token_function: callback to get the current token, as above + update_function: callback go get stream updates, as above """ - self.upto_token = self.current_token() + self.current_token = current_token_function + self.update_function = update_function + + # The token from which we last asked for updates + self.last_token = self.current_token() def discard_updates_and_advance(self): """Called when the stream should advance but the updates would be discarded, e.g. when there are no currently connected workers. """ - self.upto_token = self.current_token() - self.last_token = self.upto_token + self.last_token = self.current_token() - async def get_updates(self): + async def get_updates(self) -> StreamUpdateResult: """Gets all updates since the last time this function was called (or - since the stream was constructed if it hadn't been called before), - until the `upto_token` + since the stream was constructed if it hadn't been called before). Returns: - Deferred[Tuple[List[Tuple[int, Any]], int]: - Resolves to a pair ``(updates, current_token)``, where ``updates`` is a - list of ``(token, row)`` entries. ``row`` will be json-serialised and - sent over the replication steam. + A triplet `(updates, new_last_token, limited)`, where `updates` is + a list of `(token, row)` entries, `new_last_token` is the new + position in stream, and `limited` is whether there are more updates + to fetch. """ - updates, current_token = await self.get_updates_since(self.last_token) + current_token = self.current_token() + updates, current_token, limited = await self.get_updates_since( + self.last_token, current_token + ) self.last_token = current_token - return updates, current_token + return updates, current_token, limited - async def get_updates_since(self, from_token): + async def get_updates_since( + self, from_token: Token, upto_token: Token, limit: int = 100 + ) -> StreamUpdateResult: """Like get_updates except allows specifying from when we should stream updates Returns: - Deferred[Tuple[List[Tuple[int, Any]], int]: - Resolves to a pair ``(updates, current_token)``, where ``updates`` is a - list of ``(token, row)`` entries. ``row`` will be json-serialised and - sent over the replication steam. + A triplet `(updates, new_last_token, limited)`, where `updates` is + a list of `(token, row)` entries, `new_last_token` is the new + position in stream, and `limited` is whether there are more updates + to fetch. """ - if from_token in ("NOW", "now"): - return [], self.upto_token - - current_token = self.upto_token from_token = int(from_token) - if from_token == current_token: - return [], current_token + if from_token == upto_token: + return [], upto_token, False - logger.info("get_updates_since: %s", self.__class__) - if self._LIMITED: - rows = await self.update_function( - from_token, current_token, limit=MAX_EVENTS_BEHIND + 1 - ) + updates, upto_token, limited = await self.update_function( + from_token, upto_token, limit, + ) + return updates, upto_token, limited - # never turn more than MAX_EVENTS_BEHIND + 1 into updates. - rows = itertools.islice(rows, MAX_EVENTS_BEHIND + 1) - else: - rows = await self.update_function(from_token, current_token) +def db_query_to_update_function( + query_function: Callable[[Token, Token, int], Awaitable[Iterable[tuple]]] +) -> UpdateFunction: + """Wraps a db query function which returns a list of rows to make it + suitable for use as an `update_function` for the Stream class + """ + + async def update_function(from_token, upto_token, limit): + rows = await query_function(from_token, upto_token, limit) updates = [(row[0], row[1:]) for row in rows] + limited = False + if len(updates) == limit: + upto_token = updates[-1][0] + limited = True + assert len(updates) <= limit - # check we didn't get more rows than the limit. - # doing it like this allows the update_function to be a generator. - if self._LIMITED and len(updates) >= MAX_EVENTS_BEHIND: - raise Exception("stream %s has fallen behind" % (self.NAME)) + return updates, upto_token, limited - return updates, current_token + return update_function - def current_token(self): - """Gets the current token of the underlying streams. Should be provided - by the sub classes - Returns: - int - """ - raise NotImplementedError() +def make_http_update_function(hs, stream_name: str) -> UpdateFunction: + """Makes a suitable function for use as an `update_function` that queries + the master process for updates. + """ - def update_function(self, from_token, current_token, limit=None): - """Get updates between from_token and to_token. If Stream._LIMITED is - True then limit is provided, otherwise it's not. + client = ReplicationGetStreamUpdates.make_client(hs) - Returns: - Deferred(list(tuple)): the first entry in the tuple is the token for - that update, and the rest of the tuple gets used to construct - a ``ROW_TYPE`` instance - """ - raise NotImplementedError() + async def update_function( + from_token: int, upto_token: int, limit: int + ) -> StreamUpdateResult: + result = await client( + stream_name=stream_name, + from_token=from_token, + upto_token=upto_token, + limit=limit, + ) + return result["updates"], result["upto_token"], result["limited"] + + return update_function class BackfillStream(Stream): @@ -240,93 +208,157 @@ class BackfillStream(Stream): or it went from being an outlier to not. """ + BackfillStreamRow = namedtuple( + "BackfillStreamRow", + ( + "event_id", # str + "room_id", # str + "type", # str + "state_key", # str, optional + "redacts", # str, optional + "relates_to", # str, optional + ), + ) + NAME = "backfill" ROW_TYPE = BackfillStreamRow def __init__(self, hs): store = hs.get_datastore() - self.current_token = store.get_current_backfill_token # type: ignore - self.update_function = store.get_all_new_backfill_event_rows # type: ignore - - super(BackfillStream, self).__init__(hs) + super().__init__( + store.get_current_backfill_token, + db_query_to_update_function(store.get_all_new_backfill_event_rows), + ) class PresenceStream(Stream): + PresenceStreamRow = namedtuple( + "PresenceStreamRow", + ( + "user_id", # str + "state", # str + "last_active_ts", # int + "last_federation_update_ts", # int + "last_user_sync_ts", # int + "status_msg", # str + "currently_active", # bool + ), + ) + NAME = "presence" - _LIMITED = False ROW_TYPE = PresenceStreamRow def __init__(self, hs): store = hs.get_datastore() - presence_handler = hs.get_presence_handler() - self.current_token = store.get_current_presence_token # type: ignore - self.update_function = presence_handler.get_all_presence_updates # type: ignore + if hs.config.worker_app is None: + # on the master, query the presence handler + presence_handler = hs.get_presence_handler() + update_function = db_query_to_update_function( + presence_handler.get_all_presence_updates + ) + else: + # Query master process + update_function = make_http_update_function(hs, self.NAME) - super(PresenceStream, self).__init__(hs) + super().__init__(store.get_current_presence_token, update_function) class TypingStream(Stream): + TypingStreamRow = namedtuple( + "TypingStreamRow", ("room_id", "user_ids") # str # list(str) + ) + NAME = "typing" - _LIMITED = False ROW_TYPE = TypingStreamRow def __init__(self, hs): typing_handler = hs.get_typing_handler() - self.current_token = typing_handler.get_current_token # type: ignore - self.update_function = typing_handler.get_all_typing_updates # type: ignore + if hs.config.worker_app is None: + # on the master, query the typing handler + update_function = db_query_to_update_function( + typing_handler.get_all_typing_updates + ) + else: + # Query master process + update_function = make_http_update_function(hs, self.NAME) - super(TypingStream, self).__init__(hs) + super().__init__(typing_handler.get_current_token, update_function) class ReceiptsStream(Stream): + ReceiptsStreamRow = namedtuple( + "ReceiptsStreamRow", + ( + "room_id", # str + "receipt_type", # str + "user_id", # str + "event_id", # str + "data", # dict + ), + ) + NAME = "receipts" ROW_TYPE = ReceiptsStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_max_receipt_stream_id # type: ignore - self.update_function = store.get_all_updated_receipts # type: ignore - - super(ReceiptsStream, self).__init__(hs) + super().__init__( + store.get_max_receipt_stream_id, + db_query_to_update_function(store.get_all_updated_receipts), + ) class PushRulesStream(Stream): """A user has changed their push rules """ + PushRulesStreamRow = namedtuple("PushRulesStreamRow", ("user_id",)) # str + NAME = "push_rules" ROW_TYPE = PushRulesStreamRow def __init__(self, hs): self.store = hs.get_datastore() - super(PushRulesStream, self).__init__(hs) + super(PushRulesStream, self).__init__( + self._current_token, self._update_function + ) - def current_token(self): + def _current_token(self) -> int: push_rules_token, _ = self.store.get_push_rules_stream_token() return push_rules_token - async def update_function(self, from_token, to_token, limit): + async def _update_function(self, from_token: Token, to_token: Token, limit: int): rows = await self.store.get_all_push_rule_updates(from_token, to_token, limit) - return [(row[0], row[2]) for row in rows] + + limited = False + if len(rows) == limit: + to_token = rows[-1][0] + limited = True + + return [(row[0], (row[2],)) for row in rows], to_token, limited class PushersStream(Stream): """A user has added/changed/removed a pusher """ + PushersStreamRow = namedtuple( + "PushersStreamRow", + ("user_id", "app_id", "pushkey", "deleted"), # str # str # str # bool + ) + NAME = "pushers" ROW_TYPE = PushersStreamRow def __init__(self, hs): store = hs.get_datastore() - self.current_token = store.get_pushers_stream_token # type: ignore - self.update_function = store.get_all_updated_pushers_rows # type: ignore - - super(PushersStream, self).__init__(hs) + super().__init__( + store.get_pushers_stream_token, + db_query_to_update_function(store.get_all_updated_pushers_rows), + ) class CachesStream(Stream): @@ -334,98 +366,132 @@ class CachesStream(Stream): the cache on the workers """ + @attr.s + class CachesStreamRow: + """Stream to inform workers they should invalidate their cache. + + Attributes: + cache_func: Name of the cached function. + keys: The entry in the cache to invalidate. If None then will + invalidate all. + invalidation_ts: Timestamp of when the invalidation took place. + """ + + cache_func = attr.ib(type=str) + keys = attr.ib(type=Optional[List[Any]]) + invalidation_ts = attr.ib(type=int) + NAME = "caches" ROW_TYPE = CachesStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_cache_stream_token # type: ignore - self.update_function = store.get_all_updated_caches # type: ignore - - super(CachesStream, self).__init__(hs) + super().__init__( + store.get_cache_stream_token, + db_query_to_update_function(store.get_all_updated_caches), + ) class PublicRoomsStream(Stream): """The public rooms list changed """ + PublicRoomsStreamRow = namedtuple( + "PublicRoomsStreamRow", + ( + "room_id", # str + "visibility", # str + "appservice_id", # str, optional + "network_id", # str, optional + ), + ) + NAME = "public_rooms" ROW_TYPE = PublicRoomsStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_current_public_room_stream_id # type: ignore - self.update_function = store.get_all_new_public_rooms # type: ignore - - super(PublicRoomsStream, self).__init__(hs) + super().__init__( + store.get_current_public_room_stream_id, + db_query_to_update_function(store.get_all_new_public_rooms), + ) class DeviceListsStream(Stream): - """Someone added/changed/removed a device + """Either a user has updated their devices or a remote server needs to be + told about a device update. """ + @attr.s + class DeviceListsStreamRow: + entity = attr.ib(type=str) + NAME = "device_lists" - _LIMITED = False ROW_TYPE = DeviceListsStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_device_stream_token # type: ignore - self.update_function = store.get_all_device_list_changes_for_remotes # type: ignore - - super(DeviceListsStream, self).__init__(hs) + super().__init__( + store.get_device_stream_token, + db_query_to_update_function(store.get_all_device_list_changes_for_remotes), + ) class ToDeviceStream(Stream): """New to_device messages for a client """ + ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", ("entity",)) # str + NAME = "to_device" ROW_TYPE = ToDeviceStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_to_device_stream_token # type: ignore - self.update_function = store.get_all_new_device_messages # type: ignore - - super(ToDeviceStream, self).__init__(hs) + super().__init__( + store.get_to_device_stream_token, + db_query_to_update_function(store.get_all_new_device_messages), + ) class TagAccountDataStream(Stream): """Someone added/removed a tag for a room """ + TagAccountDataStreamRow = namedtuple( + "TagAccountDataStreamRow", ("user_id", "room_id", "data") # str # str # dict + ) + NAME = "tag_account_data" ROW_TYPE = TagAccountDataStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_max_account_data_stream_id # type: ignore - self.update_function = store.get_all_updated_tags # type: ignore - - super(TagAccountDataStream, self).__init__(hs) + super().__init__( + store.get_max_account_data_stream_id, + db_query_to_update_function(store.get_all_updated_tags), + ) class AccountDataStream(Stream): """Global or per room account data was changed """ + AccountDataStreamRow = namedtuple( + "AccountDataStream", ("user_id", "room_id", "data_type") # str # str # str + ) + NAME = "account_data" ROW_TYPE = AccountDataStreamRow def __init__(self, hs): self.store = hs.get_datastore() + super().__init__( + self.store.get_max_account_data_stream_id, + db_query_to_update_function(self._update_function), + ) - self.current_token = self.store.get_max_account_data_stream_id # type: ignore - - super(AccountDataStream, self).__init__(hs) - - async def update_function(self, from_token, to_token, limit): + async def _update_function(self, from_token, to_token, limit): global_results, room_results = await self.store.get_all_updated_account_data( from_token, from_token, to_token, limit ) @@ -440,30 +506,36 @@ class AccountDataStream(Stream): class GroupServerStream(Stream): + GroupsStreamRow = namedtuple( + "GroupsStreamRow", + ("group_id", "user_id", "type", "content"), # str # str # str # dict + ) + NAME = "groups" ROW_TYPE = GroupsStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_group_stream_token # type: ignore - self.update_function = store.get_all_groups_changes # type: ignore - - super(GroupServerStream, self).__init__(hs) + super().__init__( + store.get_group_stream_token, + db_query_to_update_function(store.get_all_groups_changes), + ) class UserSignatureStream(Stream): """A user has signed their own device with their user-signing key """ + UserSignatureStreamRow = namedtuple("UserSignatureStreamRow", ("user_id")) # str + NAME = "user_signature" - _LIMITED = False ROW_TYPE = UserSignatureStreamRow def __init__(self, hs): store = hs.get_datastore() - - self.current_token = store.get_device_stream_token # type: ignore - self.update_function = store.get_all_user_signature_changes_for_remotes # type: ignore - - super(UserSignatureStream, self).__init__(hs) + super().__init__( + store.get_device_stream_token, + db_query_to_update_function( + store.get_all_user_signature_changes_for_remotes + ), + ) diff --git a/synapse/replication/tcp/streams/events.py b/synapse/replication/tcp/streams/events.py index b3afabb8cd..051114596b 100644 --- a/synapse/replication/tcp/streams/events.py +++ b/synapse/replication/tcp/streams/events.py @@ -15,11 +15,11 @@ # limitations under the License. import heapq -from typing import Tuple, Type +from typing import Iterable, Tuple, Type import attr -from ._base import Stream +from ._base import Stream, Token, db_query_to_update_function """Handling of the 'events' replication stream @@ -116,11 +116,14 @@ class EventsStream(Stream): def __init__(self, hs): self._store = hs.get_datastore() - self.current_token = self._store.get_current_events_token # type: ignore - - super(EventsStream, self).__init__(hs) + super().__init__( + self._store.get_current_events_token, + db_query_to_update_function(self._update_function), + ) - async def update_function(self, from_token, current_token, limit=None): + async def _update_function( + self, from_token: Token, current_token: Token, limit: int + ) -> Iterable[tuple]: event_rows = await self._store.get_all_new_forward_event_rows( from_token, current_token, limit ) diff --git a/synapse/replication/tcp/streams/federation.py b/synapse/replication/tcp/streams/federation.py index 615f3dc9ac..75133d7e40 100644 --- a/synapse/replication/tcp/streams/federation.py +++ b/synapse/replication/tcp/streams/federation.py @@ -15,15 +15,7 @@ # limitations under the License. from collections import namedtuple -from ._base import Stream - -FederationStreamRow = namedtuple( - "FederationStreamRow", - ( - "type", # str, the type of data as defined in the BaseFederationRows - "data", # dict, serialization of a federation.send_queue.BaseFederationRow - ), -) +from synapse.replication.tcp.streams._base import Stream, db_query_to_update_function class FederationStream(Stream): @@ -31,13 +23,33 @@ class FederationStream(Stream): sending disabled. """ + FederationStreamRow = namedtuple( + "FederationStreamRow", + ( + "type", # str, the type of data as defined in the BaseFederationRows + "data", # dict, serialization of a federation.send_queue.BaseFederationRow + ), + ) + NAME = "federation" ROW_TYPE = FederationStreamRow def __init__(self, hs): - federation_sender = hs.get_federation_sender() - - self.current_token = federation_sender.get_current_token # type: ignore - self.update_function = federation_sender.get_replication_rows # type: ignore - - super(FederationStream, self).__init__(hs) + # Not all synapse instances will have a federation sender instance, + # whether that's a `FederationSender` or a `FederationRemoteSendQueue`, + # so we stub the stream out when that is the case. + if hs.config.worker_app is None or hs.should_send_federation(): + federation_sender = hs.get_federation_sender() + current_token = federation_sender.get_current_token + update_function = db_query_to_update_function( + federation_sender.get_replication_rows + ) + else: + current_token = lambda: 0 + update_function = self._stub_update_function + + super().__init__(current_token, update_function) + + @staticmethod + async def _stub_update_function(from_token, upto_token, limit): + return [], upto_token, False |