diff --git a/tests/replication/tcp/streams/test_events.py b/tests/replication/tcp/streams/test_events.py
new file mode 100644
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+++ b/tests/replication/tcp/streams/test_events.py
@@ -0,0 +1,417 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector Ltd
+#
+# 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.
+
+from typing import List, Optional
+
+from synapse.api.constants import EventTypes, Membership
+from synapse.events import EventBase
+from synapse.replication.tcp.streams._base import _STREAM_UPDATE_TARGET_ROW_COUNT
+from synapse.replication.tcp.streams.events import (
+ EventsStreamCurrentStateRow,
+ EventsStreamEventRow,
+ EventsStreamRow,
+)
+from synapse.rest import admin
+from synapse.rest.client.v1 import login, room
+
+from tests.replication.tcp.streams._base import BaseStreamTestCase
+from tests.test_utils.event_injection import inject_event, inject_member_event
+
+
+class EventsStreamTestCase(BaseStreamTestCase):
+ servlets = [
+ admin.register_servlets,
+ login.register_servlets,
+ room.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ super().prepare(reactor, clock, hs)
+ self.user_id = self.register_user("u1", "pass")
+ self.user_tok = self.login("u1", "pass")
+
+ self.reconnect()
+ self.test_handler.stream_positions["events"] = 0
+
+ self.room_id = self.helper.create_room_as(tok=self.user_tok)
+ self.test_handler.received_rdata_rows.clear()
+
+ def test_update_function_event_row_limit(self):
+ """Test replication with many non-state events
+
+ Checks that all events are correctly replicated when there are lots of
+ event rows to be replicated.
+ """
+ # disconnect, so that we can stack up some changes
+ self.disconnect()
+
+ # generate lots of non-state events. We inject them using inject_event
+ # so that they are not send out over replication until we call self.replicate().
+ events = [
+ self._inject_test_event()
+ for _ in range(_STREAM_UPDATE_TARGET_ROW_COUNT + 1)
+ ]
+
+ # also one state event
+ state_event = self._inject_state_event()
+
+ # tell the notifier to catch up to avoid duplicate rows.
+ # workaround for https://github.com/matrix-org/synapse/issues/7360
+ # FIXME remove this when the above is fixed
+ self.replicate()
+
+ # check we're testing what we think we are: no rows should yet have been
+ # received
+ self.assertEqual([], self.test_handler.received_rdata_rows)
+
+ # now reconnect to pull the updates
+ self.reconnect()
+ self.replicate()
+
+ # we should have received all the expected rows in the right order
+ received_rows = self.test_handler.received_rdata_rows
+ for event in events:
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "ev")
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, event.event_id)
+
+ stream_name, token, row = received_rows.pop(0)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, state_event.event_id)
+
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "state")
+ self.assertIsInstance(row.data, EventsStreamCurrentStateRow)
+ self.assertEqual(row.data.event_id, state_event.event_id)
+
+ self.assertEqual([], received_rows)
+
+ def test_update_function_huge_state_change(self):
+ """Test replication with many state events
+
+ Ensures that all events are correctly replicated when there are lots of
+ state change rows to be replicated.
+ """
+
+ # we want to generate lots of state changes at a single stream ID.
+ #
+ # We do this by having two branches in the DAG. On one, we have a moderator
+ # which that generates lots of state; on the other, we de-op the moderator,
+ # thus invalidating all the state.
+
+ OTHER_USER = "@other_user:localhost"
+
+ # have the user join
+ inject_member_event(self.hs, self.room_id, OTHER_USER, Membership.JOIN)
+
+ # Update existing power levels with mod at PL50
+ pls = self.helper.get_state(
+ self.room_id, EventTypes.PowerLevels, tok=self.user_tok
+ )
+ pls["users"][OTHER_USER] = 50
+ self.helper.send_state(
+ self.room_id, EventTypes.PowerLevels, pls, tok=self.user_tok,
+ )
+
+ # this is the point in the DAG where we make a fork
+ fork_point = self.get_success(
+ self.hs.get_datastore().get_latest_event_ids_in_room(self.room_id)
+ ) # type: List[str]
+
+ events = [
+ self._inject_state_event(sender=OTHER_USER)
+ for _ in range(_STREAM_UPDATE_TARGET_ROW_COUNT)
+ ]
+
+ self.replicate()
+ # all those events and state changes should have landed
+ self.assertGreaterEqual(
+ len(self.test_handler.received_rdata_rows), 2 * len(events)
+ )
+
+ # disconnect, so that we can stack up the changes
+ self.disconnect()
+ self.test_handler.received_rdata_rows.clear()
+
+ # a state event which doesn't get rolled back, to check that the state
+ # before the huge update comes through ok
+ state1 = self._inject_state_event()
+
+ # roll back all the state by de-modding the user
+ prev_events = fork_point
+ pls["users"][OTHER_USER] = 0
+ pl_event = inject_event(
+ self.hs,
+ prev_event_ids=prev_events,
+ type=EventTypes.PowerLevels,
+ state_key="",
+ sender=self.user_id,
+ room_id=self.room_id,
+ content=pls,
+ )
+
+ # one more bit of state that doesn't get rolled back
+ state2 = self._inject_state_event()
+
+ # tell the notifier to catch up to avoid duplicate rows.
+ # workaround for https://github.com/matrix-org/synapse/issues/7360
+ # FIXME remove this when the above is fixed
+ self.replicate()
+
+ # check we're testing what we think we are: no rows should yet have been
+ # received
+ self.assertEqual([], self.test_handler.received_rdata_rows)
+
+ # now reconnect to pull the updates
+ self.reconnect()
+ self.replicate()
+
+ # now we should have received all the expected rows in the right order.
+ #
+ # we expect:
+ #
+ # - two rows for state1
+ # - the PL event row, plus state rows for the PL event and each
+ # of the states that got reverted.
+ # - two rows for state2
+
+ received_rows = self.test_handler.received_rdata_rows
+
+ # first check the first two rows, which should be state1
+
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "ev")
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, state1.event_id)
+
+ stream_name, token, row = received_rows.pop(0)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "state")
+ self.assertIsInstance(row.data, EventsStreamCurrentStateRow)
+ self.assertEqual(row.data.event_id, state1.event_id)
+
+ # now the last two rows, which should be state2
+ stream_name, token, row = received_rows.pop(-2)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "ev")
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, state2.event_id)
+
+ stream_name, token, row = received_rows.pop(-1)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "state")
+ self.assertIsInstance(row.data, EventsStreamCurrentStateRow)
+ self.assertEqual(row.data.event_id, state2.event_id)
+
+ # that should leave us with the rows for the PL event
+ self.assertEqual(len(received_rows), len(events) + 2)
+
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "ev")
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, pl_event.event_id)
+
+ # the state rows are unsorted
+ state_rows = [] # type: List[EventsStreamCurrentStateRow]
+ for stream_name, token, row in received_rows:
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "state")
+ self.assertIsInstance(row.data, EventsStreamCurrentStateRow)
+ state_rows.append(row.data)
+
+ state_rows.sort(key=lambda r: r.state_key)
+
+ sr = state_rows.pop(0)
+ self.assertEqual(sr.type, EventTypes.PowerLevels)
+ self.assertEqual(sr.event_id, pl_event.event_id)
+ for sr in state_rows:
+ self.assertEqual(sr.type, "test_state_event")
+ # "None" indicates the state has been deleted
+ self.assertIsNone(sr.event_id)
+
+ def test_update_function_state_row_limit(self):
+ """Test replication with many state events over several stream ids.
+ """
+
+ # we want to generate lots of state changes, but for this test, we want to
+ # spread out the state changes over a few stream IDs.
+ #
+ # We do this by having two branches in the DAG. On one, we have four moderators,
+ # each of which that generates lots of state; on the other, we de-op the users,
+ # thus invalidating all the state.
+
+ NUM_USERS = 4
+ STATES_PER_USER = _STREAM_UPDATE_TARGET_ROW_COUNT // 4 + 1
+
+ user_ids = ["@user%i:localhost" % (i,) for i in range(NUM_USERS)]
+
+ # have the users join
+ for u in user_ids:
+ inject_member_event(self.hs, self.room_id, u, Membership.JOIN)
+
+ # Update existing power levels with mod at PL50
+ pls = self.helper.get_state(
+ self.room_id, EventTypes.PowerLevels, tok=self.user_tok
+ )
+ pls["users"].update({u: 50 for u in user_ids})
+ self.helper.send_state(
+ self.room_id, EventTypes.PowerLevels, pls, tok=self.user_tok,
+ )
+
+ # this is the point in the DAG where we make a fork
+ fork_point = self.get_success(
+ self.hs.get_datastore().get_latest_event_ids_in_room(self.room_id)
+ ) # type: List[str]
+
+ events = [] # type: List[EventBase]
+ for user in user_ids:
+ events.extend(
+ self._inject_state_event(sender=user) for _ in range(STATES_PER_USER)
+ )
+
+ self.replicate()
+
+ # all those events and state changes should have landed
+ self.assertGreaterEqual(
+ len(self.test_handler.received_rdata_rows), 2 * len(events)
+ )
+
+ # disconnect, so that we can stack up the changes
+ self.disconnect()
+ self.test_handler.received_rdata_rows.clear()
+
+ # now roll back all that state by de-modding the users
+ prev_events = fork_point
+ pl_events = []
+ for u in user_ids:
+ pls["users"][u] = 0
+ e = inject_event(
+ self.hs,
+ prev_event_ids=prev_events,
+ type=EventTypes.PowerLevels,
+ state_key="",
+ sender=self.user_id,
+ room_id=self.room_id,
+ content=pls,
+ )
+ prev_events = [e.event_id]
+ pl_events.append(e)
+
+ # tell the notifier to catch up to avoid duplicate rows.
+ # workaround for https://github.com/matrix-org/synapse/issues/7360
+ # FIXME remove this when the above is fixed
+ self.replicate()
+
+ # check we're testing what we think we are: no rows should yet have been
+ # received
+ self.assertEqual([], self.test_handler.received_rdata_rows)
+
+ # now reconnect to pull the updates
+ self.reconnect()
+ self.replicate()
+
+ # we should have received all the expected rows in the right order
+
+ received_rows = self.test_handler.received_rdata_rows
+ self.assertGreaterEqual(len(received_rows), len(events))
+ for i in range(NUM_USERS):
+ # for each user, we expect the PL event row, followed by state rows for
+ # the PL event and each of the states that got reverted.
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "ev")
+ self.assertIsInstance(row.data, EventsStreamEventRow)
+ self.assertEqual(row.data.event_id, pl_events[i].event_id)
+
+ # the state rows are unsorted
+ state_rows = [] # type: List[EventsStreamCurrentStateRow]
+ for j in range(STATES_PER_USER + 1):
+ stream_name, token, row = received_rows.pop(0)
+ self.assertEqual("events", stream_name)
+ self.assertIsInstance(row, EventsStreamRow)
+ self.assertEqual(row.type, "state")
+ self.assertIsInstance(row.data, EventsStreamCurrentStateRow)
+ state_rows.append(row.data)
+
+ state_rows.sort(key=lambda r: r.state_key)
+
+ sr = state_rows.pop(0)
+ self.assertEqual(sr.type, EventTypes.PowerLevels)
+ self.assertEqual(sr.event_id, pl_events[i].event_id)
+ for sr in state_rows:
+ self.assertEqual(sr.type, "test_state_event")
+ # "None" indicates the state has been deleted
+ self.assertIsNone(sr.event_id)
+
+ self.assertEqual([], received_rows)
+
+ event_count = 0
+
+ def _inject_test_event(
+ self, body: Optional[str] = None, sender: Optional[str] = None, **kwargs
+ ) -> EventBase:
+ if sender is None:
+ sender = self.user_id
+
+ if body is None:
+ body = "event %i" % (self.event_count,)
+ self.event_count += 1
+
+ return inject_event(
+ self.hs,
+ room_id=self.room_id,
+ sender=sender,
+ type="test_event",
+ content={"body": body},
+ **kwargs
+ )
+
+ def _inject_state_event(
+ self,
+ body: Optional[str] = None,
+ state_key: Optional[str] = None,
+ sender: Optional[str] = None,
+ ) -> EventBase:
+ if sender is None:
+ sender = self.user_id
+
+ if state_key is None:
+ state_key = "state_%i" % (self.event_count,)
+ self.event_count += 1
+
+ if body is None:
+ body = "state event %s" % (state_key,)
+
+ return inject_event(
+ self.hs,
+ room_id=self.room_id,
+ sender=sender,
+ type="test_state_event",
+ state_key=state_key,
+ content={"body": body},
+ )
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