from typing import Callable, List, Optional, Tuple from unittest.mock import Mock from twisted.test.proto_helpers import MemoryReactor from synapse.api.constants import EventTypes from synapse.events import EventBase from synapse.federation.sender import ( FederationSender, PerDestinationQueue, TransactionManager, ) from synapse.federation.units import Edu, Transaction from synapse.rest import admin from synapse.rest.client import login, room from synapse.server import HomeServer from synapse.types import JsonDict from synapse.util import Clock from synapse.util.retryutils import NotRetryingDestination from tests.test_utils import event_injection, make_awaitable from tests.unittest import FederatingHomeserverTestCase class FederationCatchUpTestCases(FederatingHomeserverTestCase): """ Tests cases of catching up over federation. By default for test cases federation sending is disabled. This Test class has it re-enabled for the main process. """ servlets = [ admin.register_servlets, room.register_servlets, login.register_servlets, ] def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer: self.federation_transport_client = Mock(spec=["send_transaction"]) return self.setup_test_homeserver( federation_transport_client=self.federation_transport_client, ) def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None: # stub out get_current_hosts_in_room state_storage_controller = hs.get_storage_controllers().state # This mock is crucial for destination_rooms to be populated. # TODO: this seems to no longer be the case---tests pass with this mock # commented out. state_storage_controller.get_current_hosts_in_room = Mock( # type: ignore[assignment] return_value=make_awaitable({"test", "host2"}) ) # whenever send_transaction is called, record the pdu data self.pdus: List[JsonDict] = [] self.failed_pdus: List[JsonDict] = [] self.is_online = True self.federation_transport_client.send_transaction.side_effect = ( self.record_transaction ) federation_sender = hs.get_federation_sender() assert isinstance(federation_sender, FederationSender) self.federation_sender = federation_sender def default_config(self) -> JsonDict: config = super().default_config() config["federation_sender_instances"] = None return config async def record_transaction( self, txn: Transaction, json_cb: Optional[Callable[[], JsonDict]] ) -> JsonDict: if json_cb is None: # The tests seem to expect that this method raises in this situation. raise Exception("Blank json_cb") elif self.is_online: data = json_cb() self.pdus.extend(data["pdus"]) return {} else: data = json_cb() self.failed_pdus.extend(data["pdus"]) raise NotRetryingDestination(0, 24 * 60 * 60 * 1000, txn.destination) def get_destination_room(self, room: str, destination: str = "host2") -> dict: """ Gets the destination_rooms entry for a (destination, room_id) pair. Args: room: room ID destination: what destination, default is "host2" Returns: Dictionary of { event_id: str, stream_ordering: int } """ event_id, stream_ordering = self.get_success( self.hs.get_datastores().main.db_pool.execute( "test:get_destination_rooms", None, """ SELECT event_id, stream_ordering FROM destination_rooms dr JOIN events USING (stream_ordering) WHERE dr.destination = ? AND dr.room_id = ? """, destination, room, ) )[0] return {"event_id": event_id, "stream_ordering": stream_ordering} def test_catch_up_destination_rooms_tracking(self) -> None: """ Tests that we populate the `destination_rooms` table as needed. """ self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room = self.helper.create_room_as("u1", tok=u1_token) self.get_success( event_injection.inject_member_event(self.hs, room, "@user:host2", "join") ) event_id_1 = self.helper.send(room, "wombats!", tok=u1_token)["event_id"] row_1 = self.get_destination_room(room) event_id_2 = self.helper.send(room, "rabbits!", tok=u1_token)["event_id"] row_2 = self.get_destination_room(room) # check: events correctly registered in order self.assertEqual(row_1["event_id"], event_id_1) self.assertEqual(row_2["event_id"], event_id_2) self.assertEqual(row_1["stream_ordering"], row_2["stream_ordering"] - 1) def test_catch_up_last_successful_stream_ordering_tracking(self) -> None: """ Tests that we populate the `destination_rooms` table as needed. """ self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room = self.helper.create_room_as("u1", tok=u1_token) # take the remote offline self.is_online = False self.get_success( event_injection.inject_member_event(self.hs, room, "@user:host2", "join") ) self.helper.send(room, "wombats!", tok=u1_token) self.pump() lsso_1 = self.get_success( self.hs.get_datastores().main.get_destination_last_successful_stream_ordering( "host2" ) ) self.assertIsNone( lsso_1, "There should be no last successful stream ordering for an always-offline destination", ) # bring the remote online self.is_online = True event_id_2 = self.helper.send(room, "rabbits!", tok=u1_token)["event_id"] lsso_2 = self.get_success( self.hs.get_datastores().main.get_destination_last_successful_stream_ordering( "host2" ) ) row_2 = self.get_destination_room(room) self.assertEqual( self.pdus[0]["content"]["body"], "rabbits!", "Test fault: didn't receive the right PDU", ) self.assertEqual( row_2["event_id"], event_id_2, "Test fault: destination_rooms not updated correctly", ) self.assertEqual( lsso_2, row_2["stream_ordering"], "Send succeeded but not marked as last_successful_stream_ordering", ) def test_catch_up_from_blank_state(self) -> None: """ Runs an overall test of federation catch-up from scratch. Further tests will focus on more narrow aspects and edge-cases, but I hope to provide an overall view with this test. """ # bring the other server online self.is_online = True # let's make some events for the other server to receive self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room_1 = self.helper.create_room_as("u1", tok=u1_token) room_2 = self.helper.create_room_as("u1", tok=u1_token) # also critical to federate self.get_success( event_injection.inject_member_event(self.hs, room_1, "@user:host2", "join") ) self.get_success( event_injection.inject_member_event(self.hs, room_2, "@user:host2", "join") ) self.helper.send_state( room_1, event_type="m.room.topic", body={"topic": "wombat"}, tok=u1_token ) # check: PDU received for topic event self.assertEqual(len(self.pdus), 1) self.assertEqual(self.pdus[0]["type"], "m.room.topic") # take the remote offline self.is_online = False # send another event self.helper.send(room_1, "hi user!", tok=u1_token) # check: things didn't go well since the remote is down self.assertEqual(len(self.failed_pdus), 1) self.assertEqual(self.failed_pdus[0]["content"]["body"], "hi user!") # let's delete the federation transmission queue # (this pretends we are starting up fresh.) self.assertFalse( self.federation_sender._per_destination_queues[ "host2" ].transmission_loop_running ) del self.federation_sender._per_destination_queues["host2"] # let's also clear any backoffs self.get_success( self.hs.get_datastores().main.set_destination_retry_timings( "host2", None, 0, 0 ) ) # bring the remote online and clear the received pdu list self.is_online = True self.pdus = [] # now we need to initiate a federation transaction somehow… # to do that, let's send another event (because it's simple to do) # (do it to another room otherwise the catch-up logic decides it doesn't # need to catch up room_1 — something I overlooked when first writing # this test) self.helper.send(room_2, "wombats!", tok=u1_token) # we should now have received both PDUs self.assertEqual(len(self.pdus), 2) self.assertEqual(self.pdus[0]["content"]["body"], "hi user!") self.assertEqual(self.pdus[1]["content"]["body"], "wombats!") def make_fake_destination_queue( self, destination: str = "host2" ) -> Tuple[PerDestinationQueue, List[EventBase]]: """ Makes a fake per-destination queue. """ transaction_manager = TransactionManager(self.hs) per_dest_queue = PerDestinationQueue(self.hs, transaction_manager, destination) results_list = [] async def fake_send( destination_tm: str, pending_pdus: List[EventBase], _pending_edus: List[Edu], ) -> None: assert destination == destination_tm results_list.extend(pending_pdus) transaction_manager.send_new_transaction = fake_send # type: ignore[assignment] return per_dest_queue, results_list def test_catch_up_loop(self) -> None: """ Tests the behaviour of _catch_up_transmission_loop. """ # ARRANGE: # - a local user (u1) # - 3 rooms which u1 is joined to (and remote user @user:host2 is # joined to) # - some events (1 to 5) in those rooms # we have 'already sent' events 1 and 2 to host2 per_dest_queue, sent_pdus = self.make_fake_destination_queue() self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room_1 = self.helper.create_room_as("u1", tok=u1_token) room_2 = self.helper.create_room_as("u1", tok=u1_token) room_3 = self.helper.create_room_as("u1", tok=u1_token) self.get_success( event_injection.inject_member_event(self.hs, room_1, "@user:host2", "join") ) self.get_success( event_injection.inject_member_event(self.hs, room_2, "@user:host2", "join") ) self.get_success( event_injection.inject_member_event(self.hs, room_3, "@user:host2", "join") ) # create some events self.helper.send(room_1, "you hear me!!", tok=u1_token) event_id_2 = self.helper.send(room_2, "wombats!", tok=u1_token)["event_id"] self.helper.send(room_3, "Matrix!", tok=u1_token) event_id_4 = self.helper.send(room_2, "rabbits!", tok=u1_token)["event_id"] event_id_5 = self.helper.send(room_3, "Synapse!", tok=u1_token)["event_id"] # destination_rooms should already be populated, but let us pretend that we already # sent (successfully) up to and including event id 2 event_2 = self.get_success(self.hs.get_datastores().main.get_event(event_id_2)) # also fetch event 5 so we know its last_successful_stream_ordering later event_5 = self.get_success(self.hs.get_datastores().main.get_event(event_id_5)) assert event_2.internal_metadata.stream_ordering is not None self.get_success( self.hs.get_datastores().main.set_destination_last_successful_stream_ordering( "host2", event_2.internal_metadata.stream_ordering ) ) # ACT self.get_success(per_dest_queue._catch_up_transmission_loop()) # ASSERT, noticing in particular: # - event 3 not sent out, because event 5 replaces it # - order is least recent first, so event 5 comes after event 4 # - catch-up is completed self.assertEqual(len(sent_pdus), 2) self.assertEqual(sent_pdus[0].event_id, event_id_4) self.assertEqual(sent_pdus[1].event_id, event_id_5) self.assertFalse(per_dest_queue._catching_up) self.assertEqual( per_dest_queue._last_successful_stream_ordering, event_5.internal_metadata.stream_ordering, ) def test_catch_up_on_synapse_startup(self) -> None: """ Tests the behaviour of get_catch_up_outstanding_destinations and _wake_destinations_needing_catchup. """ # list of sorted server names (note that there are more servers than the batch # size used in get_catch_up_outstanding_destinations). server_names = ["server%02d" % number for number in range(42)] + ["zzzerver"] # ARRANGE: # - a local user (u1) # - a room which u1 is joined to (and remote users @user:serverXX are # joined to) # mark the remotes as online self.is_online = True self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room_id = self.helper.create_room_as("u1", tok=u1_token) for server_name in server_names: self.get_success( event_injection.inject_member_event( self.hs, room_id, "@user:%s" % server_name, "join" ) ) # create an event self.helper.send(room_id, "deary me!", tok=u1_token) # ASSERT: # - All servers are up to date so none should have outstanding catch-up outstanding_when_successful = self.get_success( self.hs.get_datastores().main.get_catch_up_outstanding_destinations(None) ) self.assertEqual(outstanding_when_successful, []) # ACT: # - Make the remote servers unreachable self.is_online = False # - Mark zzzerver as being backed-off from now = self.clock.time_msec() self.get_success( self.hs.get_datastores().main.set_destination_retry_timings( "zzzerver", now, now, 24 * 60 * 60 * 1000 # retry in 1 day ) ) # - Send an event self.helper.send(room_id, "can anyone hear me?", tok=u1_token) # ASSERT (get_catch_up_outstanding_destinations): # - all remotes are outstanding # - they are returned in batches of 25, in order outstanding_1 = self.get_success( self.hs.get_datastores().main.get_catch_up_outstanding_destinations(None) ) self.assertEqual(len(outstanding_1), 25) self.assertEqual(outstanding_1, server_names[0:25]) outstanding_2 = self.get_success( self.hs.get_datastores().main.get_catch_up_outstanding_destinations( outstanding_1[-1] ) ) self.assertNotIn("zzzerver", outstanding_2) self.assertEqual(len(outstanding_2), 17) self.assertEqual(outstanding_2, server_names[25:-1]) # ACT: call _wake_destinations_needing_catchup # patch wake_destination to just count the destinations instead woken = [] def wake_destination_track(destination: str) -> None: woken.append(destination) self.federation_sender.wake_destination = wake_destination_track # type: ignore[assignment] # cancel the pre-existing timer for _wake_destinations_needing_catchup # this is because we are calling it manually rather than waiting for it # to be called automatically assert self.federation_sender._catchup_after_startup_timer is not None self.federation_sender._catchup_after_startup_timer.cancel() self.get_success( self.federation_sender._wake_destinations_needing_catchup(), by=5.0 ) # ASSERT (_wake_destinations_needing_catchup): # - all remotes are woken up, save for zzzerver self.assertNotIn("zzzerver", woken) # - all destinations are woken exactly once; they appear once in woken. self.assertCountEqual(woken, server_names[:-1]) def test_not_latest_event(self) -> None: """Test that we send the latest event in the room even if its not ours.""" per_dest_queue, sent_pdus = self.make_fake_destination_queue() # Make a room with a local user, and two servers. One will go offline # and one will send some events. self.register_user("u1", "you the one") u1_token = self.login("u1", "you the one") room_1 = self.helper.create_room_as("u1", tok=u1_token) self.get_success( event_injection.inject_member_event(self.hs, room_1, "@user:host2", "join") ) event_1 = self.get_success( event_injection.inject_member_event(self.hs, room_1, "@user:host3", "join") ) # First we send something from the local server, so that we notice the # remote is down and go into catchup mode. self.helper.send(room_1, "you hear me!!", tok=u1_token) # Now simulate us receiving an event from the still online remote. event_2 = self.get_success( event_injection.inject_event( self.hs, type=EventTypes.Message, sender="@user:host3", room_id=room_1, content={"msgtype": "m.text", "body": "Hello"}, ) ) assert event_1.internal_metadata.stream_ordering is not None self.get_success( self.hs.get_datastores().main.set_destination_last_successful_stream_ordering( "host2", event_1.internal_metadata.stream_ordering ) ) self.get_success(per_dest_queue._catch_up_transmission_loop()) # We expect only the last message from the remote, event_2, to have been # sent, rather than the last *local* event that was sent. self.assertEqual(len(sent_pdus), 1) self.assertEqual(sent_pdus[0].event_id, event_2.event_id) self.assertFalse(per_dest_queue._catching_up)