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synapse-old/tests/federation/test_federation_catch_up.py

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from typing import Callable, Collection, List, Optional, Tuple
from unittest import mock
from unittest.mock import AsyncMock, 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
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 = AsyncMock( # type: ignore[method-assign]
return_value={"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",
"""
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 = set()
def wake_destination_track(destination: str) -> None:
woken.add(destination)
self.federation_sender.wake_destination = wake_destination_track # type: ignore[method-assign]
# We wait quite long so that all dests can be woken up, since there is a delay
# between them.
self.pump(by=5.0)
# ASSERT (_wake_destinations_needing_catchup):
# - all remotes are woken up, save for zzzerver
self.assertNotIn("zzzerver", woken)
# - all destinations are woken, potentially more than once, since the
# wake up is called regularly and we don't ack in this test that a transaction
# has been successfully sent.
self.assertCountEqual(woken, set(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)
def test_catch_up_is_not_blocked_by_remote_event_in_partial_state_room(
self,
) -> None:
"""Detects (part of?) https://github.com/matrix-org/synapse/issues/15220."""
# ARRANGE:
# - a local user (u1)
# - a room which contains u1 and two remote users, @u2:host2 and @u3:other
# - events in that room such that
# - history visibility is restricted
# - u1 sent message events e1 and e2
# - afterwards, u3 sent a remote event e3
# - catchup to begin for host2; last successfully sent event was e1
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 = self.helper.create_room_as("u1", tok=u1_token)
self.helper.send_state(
room_id=room,
event_type="m.room.history_visibility",
body={"history_visibility": "joined"},
tok=u1_token,
)
self.get_success(
event_injection.inject_member_event(self.hs, room, "@u2:host2", "join")
)
self.get_success(
event_injection.inject_member_event(self.hs, room, "@u3:other", "join")
)
# create some events
event_id_1 = self.helper.send(room, "hello", tok=u1_token)["event_id"]
event_id_2 = self.helper.send(room, "world", tok=u1_token)["event_id"]
# pretend that u3 changes their displayname
event_id_3 = self.get_success(
event_injection.inject_member_event(self.hs, room, "@u3:other", "join")
).event_id
# destination_rooms should already be populated, but let us pretend that we already
# sent (successfully) up to and including event id 1
event_1 = self.get_success(self.hs.get_datastores().main.get_event(event_id_1))
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
)
)
# also fetch event 2 so we can compare its stream ordering to the sender's
# last_successful_stream_ordering later
event_2 = self.get_success(self.hs.get_datastores().main.get_event(event_id_2))
# Mock event 3 as having partial state
self.get_success(
event_injection.mark_event_as_partial_state(self.hs, event_id_3, room)
)
# Fail the test if we block on full state for event 3.
async def mock_await_full_state(event_ids: Collection[str]) -> None:
if event_id_3 in event_ids:
raise AssertionError("Tried to await full state for event_id_3")
# ACT
with mock.patch.object(
self.hs.get_storage_controllers().state._partial_state_events_tracker,
"await_full_state",
mock_await_full_state,
):
self.get_success(per_dest_queue._catch_up_transmission_loop())
# ASSERT
# We should have:
# - not sent event 3: it's not ours, and the room is partial stated
# - fallen back to sending event 2: it's the most recent event in the room
# we tried to send to host2
# - completed catch-up
self.assertEqual(len(sent_pdus), 1)
self.assertEqual(sent_pdus[0].event_id, event_id_2)
self.assertFalse(per_dest_queue._catching_up)
self.assertEqual(
per_dest_queue._last_successful_stream_ordering,
event_2.internal_metadata.stream_ordering,
)
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