diff options
| -rw-r--r-- | changelog.d/6706.misc | 1 | ||||
| -rw-r--r-- | docs/tcp_replication.md | 6 | ||||
| -rw-r--r-- | synapse/app/federation_sender.py | 12 | ||||
| -rw-r--r-- | synapse/federation/sender/__init__.py | 18 | ||||
| -rw-r--r-- | synapse/federation/transport/server.py | 19 | ||||
| -rw-r--r-- | synapse/notifier.py | 31 | ||||
| -rw-r--r-- | synapse/replication/tcp/client.py | 3 | ||||
| -rw-r--r-- | synapse/replication/tcp/commands.py | 17 | ||||
| -rw-r--r-- | synapse/replication/tcp/protocol.py | 15 | ||||
| -rw-r--r-- | synapse/replication/tcp/resource.py | 9 | ||||
| -rw-r--r-- | synapse/server.pyi | 12 |
11 files changed, 135 insertions, 8 deletions
diff --git a/changelog.d/6706.misc b/changelog.d/6706.misc new file mode 100644 index 0000000000..1ac11cc04b --- /dev/null +++ b/changelog.d/6706.misc @@ -0,0 +1 @@ +Attempt to retry sending a transaction when we detect a remote server has come back online, rather than waiting for a transaction to be triggered by new data. diff --git a/docs/tcp_replication.md b/docs/tcp_replication.md index ba9e874d07..a0b1d563ff 100644 --- a/docs/tcp_replication.md +++ b/docs/tcp_replication.md @@ -209,7 +209,7 @@ Where `<token>` may be either: * a numeric stream_id to stream updates since (exclusive) * `NOW` to stream all subsequent updates. -The `<stream_name>` is the name of a replication stream to subscribe +The `<stream_name>` is the name of a replication stream to subscribe to (see [here](../synapse/replication/tcp/streams/_base.py) for a list of streams). It can also be `ALL` to subscribe to all known streams, in which case the `<token>` must be set to `NOW`. @@ -234,6 +234,10 @@ in which case the `<token>` must be set to `NOW`. Used exclusively in tests +### REMOTE_SERVER_UP (S, C) + + Inform other processes that a remote server may have come back online. + See `synapse/replication/tcp/commands.py` for a detailed description and the format of each command. diff --git a/synapse/app/federation_sender.py b/synapse/app/federation_sender.py index a57cf991ac..38d11fdd0f 100644 --- a/synapse/app/federation_sender.py +++ b/synapse/app/federation_sender.py @@ -158,6 +158,13 @@ class FederationSenderReplicationHandler(ReplicationClientHandler): args.update(self.send_handler.stream_positions()) return args + def on_remote_server_up(self, server: str): + """Called when get a new REMOTE_SERVER_UP command.""" + + # Let's wake up the transaction queue for the server in case we have + # pending stuff to send to it. + self.send_handler.wake_destination(server) + def start(config_options): try: @@ -205,7 +212,7 @@ class FederationSenderHandler(object): to the federation sender. """ - def __init__(self, hs, replication_client): + def __init__(self, hs: FederationSenderServer, replication_client): self.store = hs.get_datastore() self._is_mine_id = hs.is_mine_id self.federation_sender = hs.get_federation_sender() @@ -226,6 +233,9 @@ class FederationSenderHandler(object): self.store.get_room_max_stream_ordering() ) + def wake_destination(self, server: str): + self.federation_sender.wake_destination(server) + def stream_positions(self): return {"federation": self.federation_position} diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py index 4ebb0e8bc0..36c83c3027 100644 --- a/synapse/federation/sender/__init__.py +++ b/synapse/federation/sender/__init__.py @@ -21,6 +21,7 @@ from prometheus_client import Counter from twisted.internet import defer +import synapse import synapse.metrics from synapse.federation.sender.per_destination_queue import PerDestinationQueue from synapse.federation.sender.transaction_manager import TransactionManager @@ -54,7 +55,7 @@ sent_pdus_destination_dist_total = Counter( class FederationSender(object): - def __init__(self, hs): + def __init__(self, hs: "synapse.server.HomeServer"): self.hs = hs self.server_name = hs.hostname @@ -482,7 +483,20 @@ class FederationSender(object): def send_device_messages(self, destination): if destination == self.server_name: - logger.info("Not sending device update to ourselves") + logger.warning("Not sending device update to ourselves") + return + + self._get_per_destination_queue(destination).attempt_new_transaction() + + def wake_destination(self, destination: str): + """Called when we want to retry sending transactions to a remote. + + This is mainly useful if the remote server has been down and we think it + might have come back. + """ + + if destination == self.server_name: + logger.warning("Not waking up ourselves") return self._get_per_destination_queue(destination).attempt_new_transaction() diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index b4cbf23394..d8cf9ed299 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -44,6 +44,7 @@ from synapse.logging.opentracing import ( tags, whitelisted_homeserver, ) +from synapse.server import HomeServer from synapse.types import ThirdPartyInstanceID, get_domain_from_id from synapse.util.ratelimitutils import FederationRateLimiter from synapse.util.versionstring import get_version_string @@ -101,12 +102,17 @@ class NoAuthenticationError(AuthenticationError): class Authenticator(object): - def __init__(self, hs): + def __init__(self, hs: HomeServer): self._clock = hs.get_clock() self.keyring = hs.get_keyring() self.server_name = hs.hostname self.store = hs.get_datastore() self.federation_domain_whitelist = hs.config.federation_domain_whitelist + self.notifer = hs.get_notifier() + + self.replication_client = None + if hs.config.worker.worker_app: + self.replication_client = hs.get_tcp_replication() # A method just so we can pass 'self' as the authenticator to the Servlets async def authenticate_request(self, request, content): @@ -166,6 +172,17 @@ class Authenticator(object): try: logger.info("Marking origin %r as up", origin) await self.store.set_destination_retry_timings(origin, None, 0, 0) + + # Inform the relevant places that the remote server is back up. + self.notifer.notify_remote_server_up(origin) + if self.replication_client: + # If we're on a worker we try and inform master about this. The + # replication client doesn't hook into the notifier to avoid + # infinite loops where we send a `REMOTE_SERVER_UP` command to + # master, which then echoes it back to us which in turn pokes + # the notifier. + self.replication_client.send_remote_server_up(origin) + except Exception: logger.exception("Error resetting retry timings on %s", origin) diff --git a/synapse/notifier.py b/synapse/notifier.py index 5f5f765bea..6132727cbd 100644 --- a/synapse/notifier.py +++ b/synapse/notifier.py @@ -15,11 +15,13 @@ import logging from collections import namedtuple +from typing import Callable, List from prometheus_client import Counter from twisted.internet import defer +import synapse.server from synapse.api.constants import EventTypes, Membership from synapse.api.errors import AuthError from synapse.handlers.presence import format_user_presence_state @@ -154,7 +156,7 @@ class Notifier(object): UNUSED_STREAM_EXPIRY_MS = 10 * 60 * 1000 - def __init__(self, hs): + def __init__(self, hs: "synapse.server.HomeServer"): self.user_to_user_stream = {} self.room_to_user_streams = {} @@ -164,7 +166,12 @@ class Notifier(object): self.store = hs.get_datastore() self.pending_new_room_events = [] - self.replication_callbacks = [] + # Called when there are new things to stream over replication + self.replication_callbacks = [] # type: List[Callable[[], None]] + + # Called when remote servers have come back online after having been + # down. + self.remote_server_up_callbacks = [] # type: List[Callable[[str], None]] self.clock = hs.get_clock() self.appservice_handler = hs.get_application_service_handler() @@ -205,7 +212,7 @@ class Notifier(object): "synapse_notifier_users", "", [], lambda: len(self.user_to_user_stream) ) - def add_replication_callback(self, cb): + def add_replication_callback(self, cb: Callable[[], None]): """Add a callback that will be called when some new data is available. Callback is not given any arguments. It should *not* return a Deferred - if it needs to do any asynchronous work, a background thread should be started and @@ -213,6 +220,12 @@ class Notifier(object): """ self.replication_callbacks.append(cb) + def add_remote_server_up_callback(self, cb: Callable[[str], None]): + """Add a callback that will be called when synapse detects a server + has been + """ + self.remote_server_up_callbacks.append(cb) + def on_new_room_event( self, event, room_stream_id, max_room_stream_id, extra_users=[] ): @@ -522,3 +535,15 @@ class Notifier(object): """Notify the any replication listeners that there's a new event""" for cb in self.replication_callbacks: cb() + + def notify_remote_server_up(self, server: str): + """Notify any replication that a remote server has come back up + """ + # We call federation_sender directly rather than registering as a + # callback as a) we already have a reference to it and b) it introduces + # circular dependencies. + if self.federation_sender: + self.federation_sender.wake_destination(server) + + for cb in self.remote_server_up_callbacks: + cb(server) diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py index 52a0aefe68..fc06a7b053 100644 --- a/synapse/replication/tcp/client.py +++ b/synapse/replication/tcp/client.py @@ -143,6 +143,9 @@ class ReplicationClientHandler(AbstractReplicationClientHandler): 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. diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py index cbb36b9acf..451671412d 100644 --- a/synapse/replication/tcp/commands.py +++ b/synapse/replication/tcp/commands.py @@ -387,6 +387,20 @@ class UserIpCommand(Command): ) +class RemoteServerUpCommand(Command): + """Sent when a worker has detected that a remote server is no longer + "down" and retry timings should be reset. + + If sent from a client the server will relay to all other workers. + + Format:: + + REMOTE_SERVER_UP <server> + """ + + NAME = "REMOTE_SERVER_UP" + + _COMMANDS = ( ServerCommand, RdataCommand, @@ -401,6 +415,7 @@ _COMMANDS = ( RemovePusherCommand, InvalidateCacheCommand, UserIpCommand, + RemoteServerUpCommand, ) # type: Tuple[Type[Command], ...] # Map of command name to command type. @@ -414,6 +429,7 @@ VALID_SERVER_COMMANDS = ( ErrorCommand.NAME, PingCommand.NAME, SyncCommand.NAME, + RemoteServerUpCommand.NAME, ) # The commands the client is allowed to send @@ -427,4 +443,5 @@ VALID_CLIENT_COMMANDS = ( InvalidateCacheCommand.NAME, UserIpCommand.NAME, ErrorCommand.NAME, + RemoteServerUpCommand.NAME, ) diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py index 5f4bdf84d2..131e5acb09 100644 --- a/synapse/replication/tcp/protocol.py +++ b/synapse/replication/tcp/protocol.py @@ -76,6 +76,7 @@ from synapse.replication.tcp.commands import ( PingCommand, PositionCommand, RdataCommand, + RemoteServerUpCommand, ReplicateCommand, ServerCommand, SyncCommand, @@ -460,6 +461,9 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol): async def on_INVALIDATE_CACHE(self, cmd): 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, @@ -555,6 +559,9 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol): 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) @@ -589,6 +596,11 @@ class AbstractReplicationClientHandler(metaclass=abc.ABCMeta): 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. @@ -707,6 +719,9 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): 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) + def replicate(self, stream_name, token): """Send the subscription request to the server """ diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py index b1752e88cd..6ebf944f66 100644 --- a/synapse/replication/tcp/resource.py +++ b/synapse/replication/tcp/resource.py @@ -120,6 +120,7 @@ class ReplicationStreamer(object): self.federation_sender = hs.get_federation_sender() self.notifier.add_replication_callback(self.on_notifier_poke) + self.notifier.add_remote_server_up_callback(self.send_remote_server_up) # Keeps track of whether we are currently checking for updates self.is_looping = False @@ -288,6 +289,14 @@ class ReplicationStreamer(object): ) 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. diff --git a/synapse/server.pyi b/synapse/server.pyi index b5e0b57095..0731403047 100644 --- a/synapse/server.pyi +++ b/synapse/server.pyi @@ -1,3 +1,5 @@ +import twisted.internet + import synapse.api.auth import synapse.config.homeserver import synapse.federation.sender @@ -9,10 +11,12 @@ import synapse.handlers.deactivate_account import synapse.handlers.device import synapse.handlers.e2e_keys import synapse.handlers.message +import synapse.handlers.presence import synapse.handlers.room import synapse.handlers.room_member import synapse.handlers.set_password import synapse.http.client +import synapse.notifier import synapse.rest.media.v1.media_repository import synapse.server_notices.server_notices_manager import synapse.server_notices.server_notices_sender @@ -85,3 +89,11 @@ class HomeServer(object): self, ) -> synapse.server_notices.server_notices_sender.ServerNoticesSender: pass + def get_notifier(self) -> synapse.notifier.Notifier: + pass + def get_presence_handler(self) -> synapse.handlers.presence.PresenceHandler: + pass + def get_clock(self) -> synapse.util.Clock: + pass + def get_reactor(self) -> twisted.internet.base.ReactorBase: + pass |