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Accept threaded receipts for events related to the root event. (#14174)

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The root node of a thread (and events related to it) are considered
"part of a thread" when validating receipts. This allows clients which
show the root node in both the main timeline and the threaded timeline
to easily send receipts in either.

Note that threaded notifications are not created for these events, these
events created notifications on the main timeline.
This commit is contained in:
Patrick Cloke 2022-10-14 14:05:25 -04:00 committed by GitHub
parent 022f25b309
commit d1bdeccb50
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5 changed files with 247 additions and 8 deletions
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1
changelog.d/14174.feature Normal file
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@ -0,0 +1 @@
Support for thread-specific notifications & receipts ([MSC3771](https://github.com/matrix-org/matrix-spec-proposals/pull/3771) and [MSC3773](https://github.com/matrix-org/matrix-spec-proposals/pull/3773)).

44
synapse/rest/client/receipts.py
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@ -15,7 +15,7 @@
import logging
from typing import TYPE_CHECKING, Tuple
from synapse.api.constants import ReceiptTypes
from synapse.api.constants import MAIN_TIMELINE, ReceiptTypes
from synapse.api.errors import Codes, SynapseError
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_json_object_from_request
@ -83,7 +83,7 @@ class ReceiptRestServlet(RestServlet):
)
# Ensure the event ID roughly correlates to the thread ID.
if thread_id != await self._main_store.get_thread_id(event_id):
if not await self._is_event_in_thread(event_id, thread_id):
raise SynapseError(
400,
f"event_id {event_id} is not related to thread {thread_id}",
@ -109,6 +109,46 @@ class ReceiptRestServlet(RestServlet):
return 200, {}
async def _is_event_in_thread(self, event_id: str, thread_id: str) -> bool:
"""
The event must be related to the thread ID (in a vague sense) to ensure
clients aren't sending bogus receipts.
A thread ID is considered valid for a given event E if:
1. E has a thread relation which matches the thread ID;
2. E has another event which has a thread relation to E matching the
thread ID; or
3. E is recursively related (via any rel_type) to an event which
satisfies 1 or 2.
Given the following DAG:
A <---[m.thread]-- B <--[m.annotation]-- C
^
|--[m.reference]-- D <--[m.annotation]-- E
It is valid to send a receipt for thread A on A, B, C, D, or E.
It is valid to send a receipt for the main timeline on A, D, and E.
Args:
event_id: The event ID to check.
thread_id: The thread ID the event is potentially part of.
Returns:
True if the event belongs to the given thread, otherwise False.
"""
# If the receipt is on the main timeline, it is enough to check whether
# the event is directly related to a thread.
if thread_id == MAIN_TIMELINE:
return MAIN_TIMELINE == await self._main_store.get_thread_id(event_id)
# Otherwise, check if the event is directly part of a thread, or is the
# root message (or related to the root message) of a thread.
return thread_id == await self._main_store.get_thread_id_for_receipts(event_id)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReceiptRestServlet(hs).register(http_server)

1
synapse/storage/databases/main/cache.py
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@ -245,6 +245,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
self._attempt_to_invalidate_cache("get_relations_for_event", (redacts,))
self._attempt_to_invalidate_cache("get_applicable_edit", (redacts,))
self._attempt_to_invalidate_cache("get_thread_id", (redacts,))
self._attempt_to_invalidate_cache("get_thread_id_for_receipts", (redacts,))
if etype == EventTypes.Member:
self._membership_stream_cache.entity_has_changed(state_key, stream_ordering)

98
synapse/storage/databases/main/relations.py
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@ -946,6 +946,20 @@ class RelationsWorkerStore(SQLBaseStore):
Get the thread ID for an event. This considers multi-level relations,
e.g. an annotation to an event which is part of a thread.
It only searches up the relations tree, i.e. it only searches for events
which the given event is related to (and which those events are related
to, etc.)
Given the following DAG:
A <---[m.thread]-- B <--[m.annotation]-- C
^
|--[m.reference]-- D <--[m.annotation]-- E
get_thread_id(X) considers events B and C as part of thread A.
See also get_thread_id_for_receipts.
Args:
event_id: The event ID to fetch the thread ID for.
@ -953,22 +967,32 @@ class RelationsWorkerStore(SQLBaseStore):
The event ID of the root event in the thread, if this event is part
of a thread. "main", otherwise.
"""
# Since event relations form a tree, we should only ever find 0 or 1
# results from the below query.
# Recurse event relations up to the *root* event, then search that chain
# of relations for a thread relation. If one is found, the root event is
# returned.
#
# Note that this should only ever find 0 or 1 entries since it is invalid
# for an event to have a thread relation to an event which also has a
# relation.
sql = """
WITH RECURSIVE related_events AS (
SELECT event_id, relates_to_id, relation_type
SELECT event_id, relates_to_id, relation_type, 0 depth
FROM event_relations
WHERE event_id = ?
UNION SELECT e.event_id, e.relates_to_id, e.relation_type
UNION SELECT e.event_id, e.relates_to_id, e.relation_type, depth + 1
FROM event_relations e
INNER JOIN related_events r ON r.relates_to_id = e.event_id
) SELECT relates_to_id FROM related_events WHERE relation_type = 'm.thread';
WHERE depth <= 3
)
SELECT relates_to_id FROM related_events
WHERE relation_type = 'm.thread'
ORDER BY depth DESC
LIMIT 1;
"""
def _get_thread_id(txn: LoggingTransaction) -> str:
txn.execute(sql, (event_id,))
# TODO Should we ensure there's only a single result here?
row = txn.fetchone()
if row:
return row[0]
@ -978,6 +1002,68 @@ class RelationsWorkerStore(SQLBaseStore):
return await self.db_pool.runInteraction("get_thread_id", _get_thread_id)
@cached()
async def get_thread_id_for_receipts(self, event_id: str) -> str:
"""
Get the thread ID for an event by traversing to the top-most related event
and confirming any children events form a thread.
Given the following DAG:
A <---[m.thread]-- B <--[m.annotation]-- C
^
|--[m.reference]-- D <--[m.annotation]-- E
get_thread_id_for_receipts(X) considers events A, B, C, D, and E as part
of thread A.
See also get_thread_id.
Args:
event_id: The event ID to fetch the thread ID for.
Returns:
The event ID of the root event in the thread, if this event is part
of a thread. "main", otherwise.
"""
# Recurse event relations up to the *root* event, then search for any events
# related to that root node for a thread relation. If one is found, the
# root event is returned.
#
# Note that there cannot be thread relations in the middle of the chain since
# it is invalid for an event to have a thread relation to an event which also
# has a relation.
sql = """
SELECT relates_to_id FROM event_relations WHERE relates_to_id = COALESCE((
WITH RECURSIVE related_events AS (
SELECT event_id, relates_to_id, relation_type, 0 depth
FROM event_relations
WHERE event_id = ?
UNION SELECT e.event_id, e.relates_to_id, e.relation_type, depth + 1
FROM event_relations e
INNER JOIN related_events r ON r.relates_to_id = e.event_id
WHERE depth <= 3
)
SELECT relates_to_id FROM related_events
ORDER BY depth DESC
LIMIT 1
), ?) AND relation_type = 'm.thread' LIMIT 1;
"""
def _get_related_thread_id(txn: LoggingTransaction) -> str:
txn.execute(sql, (event_id, event_id))
row = txn.fetchone()
if row:
return row[0]
# If no thread was found, it is part of the main timeline.
return MAIN_TIMELINE
return await self.db_pool.runInteraction(
"get_related_thread_id", _get_related_thread_id
)
class RelationsStore(RelationsWorkerStore):
pass

111
tests/storage/test_relations.py Normal file
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@ -0,0 +1,111 @@
# Copyright 2022 The Matrix.org Foundation C.I.C.
#
# 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 twisted.test.proto_helpers import MemoryReactor
from synapse.api.constants import MAIN_TIMELINE
from synapse.server import HomeServer
from synapse.util import Clock
from tests import unittest
class RelationsStoreTestCase(unittest.HomeserverTestCase):
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
"""
Creates a DAG:
A <---[m.thread]-- B <--[m.annotation]-- C
^
|--[m.reference]-- D <--[m.annotation]-- E
F <--[m.annotation]-- G
"""
self._main_store = self.hs.get_datastores().main
self._create_relation("A", "B", "m.thread")
self._create_relation("B", "C", "m.annotation")
self._create_relation("A", "D", "m.reference")
self._create_relation("D", "E", "m.annotation")
self._create_relation("F", "G", "m.annotation")
def _create_relation(self, parent_id: str, event_id: str, rel_type: str) -> None:
self.get_success(
self._main_store.db_pool.simple_insert(
table="event_relations",
values={
"event_id": event_id,
"relates_to_id": parent_id,
"relation_type": rel_type,
},
)
)
def test_get_thread_id(self) -> None:
"""
Ensure that get_thread_id only searches up the tree for threads.
"""
# The thread itself and children of it return the thread.
thread_id = self.get_success(self._main_store.get_thread_id("B"))
self.assertEqual("A", thread_id)
thread_id = self.get_success(self._main_store.get_thread_id("C"))
self.assertEqual("A", thread_id)
# But the root and events related to the root do not.
thread_id = self.get_success(self._main_store.get_thread_id("A"))
self.assertEqual(MAIN_TIMELINE, thread_id)
thread_id = self.get_success(self._main_store.get_thread_id("D"))
self.assertEqual(MAIN_TIMELINE, thread_id)
thread_id = self.get_success(self._main_store.get_thread_id("E"))
self.assertEqual(MAIN_TIMELINE, thread_id)
# Events which are not related to a thread at all should return the
# main timeline.
thread_id = self.get_success(self._main_store.get_thread_id("F"))
self.assertEqual(MAIN_TIMELINE, thread_id)
thread_id = self.get_success(self._main_store.get_thread_id("G"))
self.assertEqual(MAIN_TIMELINE, thread_id)
def test_get_thread_id_for_receipts(self) -> None:
"""
Ensure that get_thread_id_for_receipts searches up and down the tree for a thread.
"""
# All of the events are considered related to this thread.
thread_id = self.get_success(self._main_store.get_thread_id_for_receipts("A"))
self.assertEqual("A", thread_id)
thread_id = self.get_success(self._main_store.get_thread_id_for_receipts("B"))
self.assertEqual("A", thread_id)
thread_id = self.get_success(self._main_store.get_thread_id_for_receipts("C"))
self.assertEqual("A", thread_id)
thread_id = self.get_success(self._main_store.get_thread_id_for_receipts("D"))
self.assertEqual("A", thread_id)
thread_id = self.get_success(self._main_store.get_thread_id_for_receipts("E"))
self.assertEqual("A", thread_id)
# Events which are not related to a thread at all should return the
# main timeline.
thread_id = self.get_success(self._main_store.get_thread_id("F"))
self.assertEqual(MAIN_TIMELINE, thread_id)
thread_id = self.get_success(self._main_store.get_thread_id("G"))
self.assertEqual(MAIN_TIMELINE, thread_id)