diff options
Diffstat (limited to 'synapse/replication/tcp/protocol.py')
| -rw-r--r-- | synapse/replication/tcp/protocol.py | 206 |
1 files changed, 71 insertions, 135 deletions
diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py index bc1482a9bb..f81d2e2442 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 @@ -53,17 +51,15 @@ import fcntl import logging import struct from collections import defaultdict -from typing import Any, DefaultDict, Dict, List, Set, Tuple +from typing import Any, DefaultDict, Dict, List, Set -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 ( @@ -82,11 +78,16 @@ from synapse.replication.tcp.commands import ( SyncCommand, UserSyncCommand, ) -from synapse.replication.tcp.streams import STREAMS_MAP +from synapse.replication.tcp.streams import STREAMS_MAP, Stream from synapse.types import Collection from synapse.util import Clock from synapse.util.stringutils import random_string +MYPY = False +if MYPY: + from synapse.server import HomeServer + + connection_close_counter = Counter( "synapse_replication_tcp_protocol_close_reason", "", ["reason_type"] ) @@ -411,16 +412,6 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol): 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) @@ -436,21 +427,10 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol): ) 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) + # Subscribe to all streams we're publishing to. + for stream_name in self.streamer.streams_by_name: + current_token = self.streamer.get_stream_token(stream_name) + self.send_command(PositionCommand(stream_name, current_token)) async def on_FEDERATION_ACK(self, cmd): self.streamer.federation_ack(cmd.token) @@ -474,87 +454,12 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol): 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) + self.send_command(RdataCommand(stream_name, token, data)) def send_sync(self, data): self.send_command(SyncCommand(data)) @@ -638,6 +543,7 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): def __init__( self, + hs: "HomeServer", client_name: str, server_name: str, clock: Clock, @@ -649,22 +555,25 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): self.server_name = server_name self.handler = handler + self.streams = { + stream.NAME: stream(hs) for stream in STREAMS_MAP.values() + } # type: Dict[str, Stream] + # 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] + self.streams_connecting = set(STREAMS_MAP) # type: Set[str] # Map of stream to batched updates. See RdataCommand for info on how # batching works. - self.pending_batches = {} # type: Dict[str, Any] + self.pending_batches = {} # type: Dict[str, List[Any]] def connectionMade(self): self.send_command(NameCommand(self.client_name)) BaseReplicationStreamProtocol.connectionMade(self) # 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) + self.replicate() # Tell the server if we have any users currently syncing (should only # happen on synchrotrons) @@ -676,10 +585,6 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): # 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() - async def on_SERVER(self, cmd): if cmd.data != self.server_name: logger.error("[%s] Connected to wrong remote: %r", self.id(), cmd.data) @@ -697,7 +602,7 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): ) raise - if cmd.token is None: + if cmd.token is None or stream_name in self.streams_connecting: # 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) @@ -707,14 +612,55 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): 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. + 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 + + # Find where we previously streamed up to. + current_token = self.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 + + # Fetch all updates between then and now. + limited = True + while limited: + updates, current_token, limited = await stream.get_updates_since( + current_token, cmd.token + ) + + # Check if the connection was closed underneath us, if so we bail + # rather than risk having concurrent catch ups going on. + if self.state == ConnectionStates.CLOSED: + return + + if updates: + await self.handler.on_rdata( + cmd.stream_name, + current_token, + [stream.parse_row(update[1]) for update in updates], + ) + + # We've now caught up to position sent to us, notify handler. + await self.handler.on_position(cmd.stream_name, cmd.token) + self.streams_connecting.discard(cmd.stream_name) if not self.streams_connecting: self.handler.finished_connecting() - await self.handler.on_position(cmd.stream_name, cmd.token) + # Check if the connection was closed underneath us, if so we bail + # rather than risk having concurrent catch ups going on. + if self.state == ConnectionStates.CLOSED: + return + + # Handle any RDATA that came in while we were catching up. + rows = self.pending_batches.pop(cmd.stream_name, []) + if rows: + await self.handler.on_rdata(cmd.stream_name, rows[-1].token, rows) async def on_SYNC(self, cmd): self.handler.on_sync(cmd.data) @@ -722,22 +668,12 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol): async def on_REMOTE_SERVER_UP(self, cmd: RemoteServerUpCommand): self.handler.on_remote_server_up(cmd.data) - def replicate(self, stream_name, token): + def replicate(self): """Send the subscription request to the server """ - 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) + logger.info("[%s] Subscribing to replication streams", self.id()) - self.send_command(ReplicateCommand(stream_name, token)) + self.send_command(ReplicateCommand()) def on_connection_closed(self): BaseReplicationStreamProtocol.on_connection_closed(self) |