summary refs log tree commit diff
path: root/synapse/storage/databases/main/relations.py
blob: b2295fd51f608f27ffa377b448027f93783842d2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
# 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.

import logging
from typing import (
    TYPE_CHECKING,
    Collection,
    Dict,
    Iterable,
    List,
    Optional,
    Set,
    Tuple,
    Union,
    cast,
)

import attr

from synapse.api.constants import RelationTypes
from synapse.events import EventBase
from synapse.storage._base import SQLBaseStore
from synapse.storage.database import (
    DatabasePool,
    LoggingDatabaseConnection,
    LoggingTransaction,
    make_in_list_sql_clause,
)
from synapse.storage.databases.main.stream import generate_pagination_where_clause
from synapse.storage.engines import PostgresEngine
from synapse.storage.relations import AggregationPaginationToken, PaginationChunk
from synapse.types import RoomStreamToken, StreamToken
from synapse.util.caches.descriptors import cached, cachedList

if TYPE_CHECKING:
    from synapse.server import HomeServer

logger = logging.getLogger(__name__)


class RelationsWorkerStore(SQLBaseStore):
    def __init__(
        self,
        database: DatabasePool,
        db_conn: LoggingDatabaseConnection,
        hs: "HomeServer",
    ):
        super().__init__(database, db_conn, hs)

        self._msc3440_enabled = hs.config.experimental.msc3440_enabled

    @cached(uncached_args=("event",), tree=True)
    async def get_relations_for_event(
        self,
        event_id: str,
        event: EventBase,
        room_id: str,
        relation_type: Optional[str] = None,
        event_type: Optional[str] = None,
        aggregation_key: Optional[str] = None,
        limit: int = 5,
        direction: str = "b",
        from_token: Optional[StreamToken] = None,
        to_token: Optional[StreamToken] = None,
    ) -> PaginationChunk:
        """Get a list of relations for an event, ordered by topological ordering.

        Args:
            event_id: Fetch events that relate to this event ID.
            event: The matching EventBase to event_id.
            room_id: The room the event belongs to.
            relation_type: Only fetch events with this relation type, if given.
            event_type: Only fetch events with this event type, if given.
            aggregation_key: Only fetch events with this aggregation key, if given.
            limit: Only fetch the most recent `limit` events.
            direction: Whether to fetch the most recent first (`"b"`) or the
                oldest first (`"f"`).
            from_token: Fetch rows from the given token, or from the start if None.
            to_token: Fetch rows up to the given token, or up to the end if None.

        Returns:
            List of event IDs that match relations requested. The rows are of
            the form `{"event_id": "..."}`.
        """
        # We don't use `event_id`, it's there so that we can cache based on
        # it. The `event_id` must match the `event.event_id`.
        assert event.event_id == event_id

        where_clause = ["relates_to_id = ?", "room_id = ?"]
        where_args: List[Union[str, int]] = [event.event_id, room_id]
        is_redacted = event.internal_metadata.is_redacted()

        if relation_type is not None:
            where_clause.append("relation_type = ?")
            where_args.append(relation_type)

        if event_type is not None:
            where_clause.append("type = ?")
            where_args.append(event_type)

        if aggregation_key:
            where_clause.append("aggregation_key = ?")
            where_args.append(aggregation_key)

        pagination_clause = generate_pagination_where_clause(
            direction=direction,
            column_names=("topological_ordering", "stream_ordering"),
            from_token=from_token.room_key.as_historical_tuple()
            if from_token
            else None,
            to_token=to_token.room_key.as_historical_tuple() if to_token else None,
            engine=self.database_engine,
        )

        if pagination_clause:
            where_clause.append(pagination_clause)

        if direction == "b":
            order = "DESC"
        else:
            order = "ASC"

        sql = """
            SELECT event_id, relation_type, topological_ordering, stream_ordering
            FROM event_relations
            INNER JOIN events USING (event_id)
            WHERE %s
            ORDER BY topological_ordering %s, stream_ordering %s
            LIMIT ?
        """ % (
            " AND ".join(where_clause),
            order,
            order,
        )

        def _get_recent_references_for_event_txn(
            txn: LoggingTransaction,
        ) -> PaginationChunk:
            txn.execute(sql, where_args + [limit + 1])

            last_topo_id = None
            last_stream_id = None
            events = []
            for row in txn:
                # Do not include edits for redacted events as they leak event
                # content.
                if not is_redacted or row[1] != RelationTypes.REPLACE:
                    events.append({"event_id": row[0]})
                last_topo_id = row[2]
                last_stream_id = row[3]

            # If there are more events, generate the next pagination key.
            next_token = None
            if len(events) > limit and last_topo_id and last_stream_id:
                next_key = RoomStreamToken(last_topo_id, last_stream_id)
                if from_token:
                    next_token = from_token.copy_and_replace("room_key", next_key)
                else:
                    next_token = StreamToken(
                        room_key=next_key,
                        presence_key=0,
                        typing_key=0,
                        receipt_key=0,
                        account_data_key=0,
                        push_rules_key=0,
                        to_device_key=0,
                        device_list_key=0,
                        groups_key=0,
                    )

            return PaginationChunk(
                chunk=list(events[:limit]), next_batch=next_token, prev_batch=from_token
            )

        return await self.db_pool.runInteraction(
            "get_recent_references_for_event", _get_recent_references_for_event_txn
        )

    async def event_includes_relation(self, event_id: str) -> bool:
        """Check if the given event relates to another event.

        An event has a relation if it has a valid m.relates_to with a rel_type
        and event_id in the content:

        {
            "content": {
                "m.relates_to": {
                    "rel_type": "m.replace",
                    "event_id": "$other_event_id"
                }
            }
        }

        Args:
            event_id: The event to check.

        Returns:
            True if the event includes a valid relation.
        """

        result = await self.db_pool.simple_select_one_onecol(
            table="event_relations",
            keyvalues={"event_id": event_id},
            retcol="event_id",
            allow_none=True,
            desc="event_includes_relation",
        )
        return result is not None

    async def event_is_target_of_relation(self, parent_id: str) -> bool:
        """Check if the given event is the target of another event's relation.

        An event is the target of an event relation if it has a valid
        m.relates_to with a rel_type and event_id pointing to parent_id in the
        content:

        {
            "content": {
                "m.relates_to": {
                    "rel_type": "m.replace",
                    "event_id": "$parent_id"
                }
            }
        }

        Args:
            parent_id: The event to check.

        Returns:
            True if the event is the target of another event's relation.
        """

        result = await self.db_pool.simple_select_one_onecol(
            table="event_relations",
            keyvalues={"relates_to_id": parent_id},
            retcol="event_id",
            allow_none=True,
            desc="event_is_target_of_relation",
        )
        return result is not None

    @cached(tree=True)
    async def get_aggregation_groups_for_event(
        self,
        event_id: str,
        room_id: str,
        event_type: Optional[str] = None,
        limit: int = 5,
        direction: str = "b",
        from_token: Optional[AggregationPaginationToken] = None,
        to_token: Optional[AggregationPaginationToken] = None,
    ) -> PaginationChunk:
        """Get a list of annotations on the event, grouped by event type and
        aggregation key, sorted by count.

        This is used e.g. to get the what and how many reactions have happend
        on an event.

        Args:
            event_id: Fetch events that relate to this event ID.
            room_id: The room the event belongs to.
            event_type: Only fetch events with this event type, if given.
            limit: Only fetch the `limit` groups.
            direction: Whether to fetch the highest count first (`"b"`) or
                the lowest count first (`"f"`).
            from_token: Fetch rows from the given token, or from the start if None.
            to_token: Fetch rows up to the given token, or up to the end if None.

        Returns:
            List of groups of annotations that match. Each row is a dict with
            `type`, `key` and `count` fields.
        """

        where_clause = ["relates_to_id = ?", "room_id = ?", "relation_type = ?"]
        where_args: List[Union[str, int]] = [
            event_id,
            room_id,
            RelationTypes.ANNOTATION,
        ]

        if event_type:
            where_clause.append("type = ?")
            where_args.append(event_type)

        having_clause = generate_pagination_where_clause(
            direction=direction,
            column_names=("COUNT(*)", "MAX(stream_ordering)"),
            from_token=attr.astuple(from_token) if from_token else None,  # type: ignore[arg-type]
            to_token=attr.astuple(to_token) if to_token else None,  # type: ignore[arg-type]
            engine=self.database_engine,
        )

        if direction == "b":
            order = "DESC"
        else:
            order = "ASC"

        if having_clause:
            having_clause = "HAVING " + having_clause
        else:
            having_clause = ""

        sql = """
            SELECT type, aggregation_key, COUNT(DISTINCT sender), MAX(stream_ordering)
            FROM event_relations
            INNER JOIN events USING (event_id)
            WHERE {where_clause}
            GROUP BY relation_type, type, aggregation_key
            {having_clause}
            ORDER BY COUNT(*) {order}, MAX(stream_ordering) {order}
            LIMIT ?
        """.format(
            where_clause=" AND ".join(where_clause),
            order=order,
            having_clause=having_clause,
        )

        def _get_aggregation_groups_for_event_txn(
            txn: LoggingTransaction,
        ) -> PaginationChunk:
            txn.execute(sql, where_args + [limit + 1])

            next_batch = None
            events = []
            for row in txn:
                events.append({"type": row[0], "key": row[1], "count": row[2]})
                next_batch = AggregationPaginationToken(row[2], row[3])

            if len(events) <= limit:
                next_batch = None

            return PaginationChunk(
                chunk=list(events[:limit]), next_batch=next_batch, prev_batch=from_token
            )

        return await self.db_pool.runInteraction(
            "get_aggregation_groups_for_event", _get_aggregation_groups_for_event_txn
        )

    @cached()
    def get_applicable_edit(self, event_id: str) -> Optional[EventBase]:
        raise NotImplementedError()

    @cachedList(cached_method_name="get_applicable_edit", list_name="event_ids")
    async def get_applicable_edits(
        self, event_ids: Collection[str]
    ) -> Dict[str, Optional[EventBase]]:
        """Get the most recent edit (if any) that has happened for the given
        events.

        Correctly handles checking whether edits were allowed to happen.

        Args:
            event_ids: The original event IDs

        Returns:
            A map of the most recent edit for each event. If there are no edits,
            the event will map to None.
        """

        # We only allow edits for `m.room.message` events that have the same sender
        # and event type. We can't assert these things during regular event auth so
        # we have to do the checks post hoc.

        # Fetches latest edit that has the same type and sender as the
        # original, and is an `m.room.message`.
        if isinstance(self.database_engine, PostgresEngine):
            # The `DISTINCT ON` clause will pick the *first* row it encounters,
            # so ordering by origin server ts + event ID desc will ensure we get
            # the latest edit.
            sql = """
                SELECT DISTINCT ON (original.event_id) original.event_id, edit.event_id FROM events AS edit
                INNER JOIN event_relations USING (event_id)
                INNER JOIN events AS original ON
                    original.event_id = relates_to_id
                    AND edit.type = original.type
                    AND edit.sender = original.sender
                    AND edit.room_id = original.room_id
                WHERE
                    %s
                    AND relation_type = ?
                    AND edit.type = 'm.room.message'
                ORDER by original.event_id DESC, edit.origin_server_ts DESC, edit.event_id DESC
            """
        else:
            # SQLite uses a simplified query which returns all edits for an
            # original event. The results are then de-duplicated when turned into
            # a dict. Due to the chosen ordering, the latest edit stomps on
            # earlier edits.
            sql = """
                SELECT original.event_id, edit.event_id FROM events AS edit
                INNER JOIN event_relations USING (event_id)
                INNER JOIN events AS original ON
                    original.event_id = relates_to_id
                    AND edit.type = original.type
                    AND edit.sender = original.sender
                    AND edit.room_id = original.room_id
                WHERE
                    %s
                    AND relation_type = ?
                    AND edit.type = 'm.room.message'
                ORDER by edit.origin_server_ts, edit.event_id
            """

        def _get_applicable_edits_txn(txn: LoggingTransaction) -> Dict[str, str]:
            clause, args = make_in_list_sql_clause(
                txn.database_engine, "relates_to_id", event_ids
            )
            args.append(RelationTypes.REPLACE)

            txn.execute(sql % (clause,), args)
            return dict(cast(Iterable[Tuple[str, str]], txn.fetchall()))

        edit_ids = await self.db_pool.runInteraction(
            "get_applicable_edits", _get_applicable_edits_txn
        )

        edits = await self.get_events(edit_ids.values())  # type: ignore[attr-defined]

        # Map to the original event IDs to the edit events.
        #
        # There might not be an edit event due to there being no edits or
        # due to the event not being known, either case is treated the same.
        return {
            original_event_id: edits.get(edit_ids.get(original_event_id))
            for original_event_id in event_ids
        }

    @cached()
    def get_thread_summary(self, event_id: str) -> Optional[Tuple[int, EventBase]]:
        raise NotImplementedError()

    @cachedList(cached_method_name="get_thread_summary", list_name="event_ids")
    async def get_thread_summaries(
        self, event_ids: Collection[str]
    ) -> Dict[str, Optional[Tuple[int, EventBase, Optional[EventBase]]]]:
        """Get the number of threaded replies, the latest reply (if any), and the latest edit for that reply for the given event.

        Args:
            event_ids: Summarize the thread related to this event ID.

        Returns:
            A map of the thread summary each event. A missing event implies there
            are no threaded replies.

            Each summary is a tuple of:
                The number of events in the thread.
                The most recent event in the thread.
                The most recent edit to the most recent event in the thread, if applicable.
        """

        def _get_thread_summaries_txn(
            txn: LoggingTransaction,
        ) -> Tuple[Dict[str, int], Dict[str, str]]:
            # Fetch the count of threaded events and the latest event ID.
            # TODO Should this only allow m.room.message events.
            if isinstance(self.database_engine, PostgresEngine):
                # The `DISTINCT ON` clause will pick the *first* row it encounters,
                # so ordering by topological ordering + stream ordering desc will
                # ensure we get the latest event in the thread.
                sql = """
                    SELECT DISTINCT ON (parent.event_id) parent.event_id, child.event_id FROM events AS child
                    INNER JOIN event_relations USING (event_id)
                    INNER JOIN events AS parent ON
                        parent.event_id = relates_to_id
                        AND parent.room_id = child.room_id
                    WHERE
                        %s
                        AND %s
                    ORDER BY parent.event_id, child.topological_ordering DESC, child.stream_ordering DESC
                """
            else:
                # SQLite uses a simplified query which returns all entries for a
                # thread. The first result for each thread is chosen to and subsequent
                # results for a thread are ignored.
                sql = """
                    SELECT parent.event_id, child.event_id FROM events AS child
                    INNER JOIN event_relations USING (event_id)
                    INNER JOIN events AS parent ON
                        parent.event_id = relates_to_id
                        AND parent.room_id = child.room_id
                    WHERE
                        %s
                        AND %s
                    ORDER BY child.topological_ordering DESC, child.stream_ordering DESC
                """

            clause, args = make_in_list_sql_clause(
                txn.database_engine, "relates_to_id", event_ids
            )

            if self._msc3440_enabled:
                relations_clause = "(relation_type = ? OR relation_type = ?)"
                args.extend((RelationTypes.THREAD, RelationTypes.UNSTABLE_THREAD))
            else:
                relations_clause = "relation_type = ?"
                args.append(RelationTypes.THREAD)

            txn.execute(sql % (clause, relations_clause), args)
            latest_event_ids = {}
            for parent_event_id, child_event_id in txn:
                # Only consider the latest threaded reply (by topological ordering).
                if parent_event_id not in latest_event_ids:
                    latest_event_ids[parent_event_id] = child_event_id

            # If no threads were found, bail.
            if not latest_event_ids:
                return {}, latest_event_ids

            # Fetch the number of threaded replies.
            sql = """
                SELECT parent.event_id, COUNT(child.event_id) FROM events AS child
                INNER JOIN event_relations USING (event_id)
                INNER JOIN events AS parent ON
                    parent.event_id = relates_to_id
                    AND parent.room_id = child.room_id
                WHERE
                    %s
                    AND %s
                GROUP BY parent.event_id
            """

            # Regenerate the arguments since only threads found above could
            # possibly have any replies.
            clause, args = make_in_list_sql_clause(
                txn.database_engine, "relates_to_id", latest_event_ids.keys()
            )

            if self._msc3440_enabled:
                relations_clause = "(relation_type = ? OR relation_type = ?)"
                args.extend((RelationTypes.THREAD, RelationTypes.UNSTABLE_THREAD))
            else:
                relations_clause = "relation_type = ?"
                args.append(RelationTypes.THREAD)

            txn.execute(sql % (clause, relations_clause), args)
            counts = dict(cast(List[Tuple[str, int]], txn.fetchall()))

            return counts, latest_event_ids

        counts, latest_event_ids = await self.db_pool.runInteraction(
            "get_thread_summaries", _get_thread_summaries_txn
        )

        latest_events = await self.get_events(latest_event_ids.values())  # type: ignore[attr-defined]

        # Check to see if any of those events are edited.
        latest_edits = await self.get_applicable_edits(latest_event_ids.values())

        # Map to the event IDs to the thread summary.
        #
        # There might not be a summary due to there not being a thread or
        # due to the latest event not being known, either case is treated the same.
        summaries = {}
        for parent_event_id, latest_event_id in latest_event_ids.items():
            latest_event = latest_events.get(latest_event_id)

            summary = None
            if latest_event:
                latest_edit = latest_edits.get(latest_event_id)
                summary = (counts[parent_event_id], latest_event, latest_edit)
            summaries[parent_event_id] = summary

        return summaries

    @cached()
    def get_thread_participated(self, event_id: str, user_id: str) -> bool:
        raise NotImplementedError()

    @cachedList(cached_method_name="get_thread_participated", list_name="event_ids")
    async def get_threads_participated(
        self, event_ids: Collection[str], user_id: str
    ) -> Dict[str, bool]:
        """Get whether the requesting user participated in the given threads.

        This is separate from get_thread_summaries since that can be cached across
        all users while this value is specific to the requester.

        Args:
            event_ids: The thread related to these event IDs.
            user_id: The user requesting the summary.

        Returns:
            A map of event ID to a boolean which represents if the requesting
            user participated in that event's thread, otherwise false.
        """

        def _get_thread_summary_txn(txn: LoggingTransaction) -> Set[str]:
            # Fetch whether the requester has participated or not.
            sql = """
                SELECT DISTINCT relates_to_id
                FROM events AS child
                INNER JOIN event_relations USING (event_id)
                INNER JOIN events AS parent ON
                    parent.event_id = relates_to_id
                    AND parent.room_id = child.room_id
                WHERE
                    %s
                    AND %s
                    AND child.sender = ?
            """

            clause, args = make_in_list_sql_clause(
                txn.database_engine, "relates_to_id", event_ids
            )

            if self._msc3440_enabled:
                relations_clause = "(relation_type = ? OR relation_type = ?)"
                args.extend((RelationTypes.THREAD, RelationTypes.UNSTABLE_THREAD))
            else:
                relations_clause = "relation_type = ?"
                args.append(RelationTypes.THREAD)

            args.append(user_id)

            txn.execute(sql % (clause, relations_clause), args)
            return {row[0] for row in txn.fetchall()}

        participated_threads = await self.db_pool.runInteraction(
            "get_thread_summary", _get_thread_summary_txn
        )

        return {event_id: event_id in participated_threads for event_id in event_ids}

    async def events_have_relations(
        self,
        parent_ids: List[str],
        relation_senders: Optional[List[str]],
        relation_types: Optional[List[str]],
    ) -> List[str]:
        """Check which events have a relationship from the given senders of the
        given types.

        Args:
            parent_ids: The events being annotated
            relation_senders: The relation senders to check.
            relation_types: The relation types to check.

        Returns:
            True if the event has at least one relationship from one of the given senders of the given type.
        """
        # If no restrictions are given then the event has the required relations.
        if not relation_senders and not relation_types:
            return parent_ids

        sql = """
            SELECT relates_to_id FROM event_relations
            INNER JOIN events USING (event_id)
            WHERE
                %s;
        """

        def _get_if_events_have_relations(txn) -> List[str]:
            clauses: List[str] = []
            clause, args = make_in_list_sql_clause(
                txn.database_engine, "relates_to_id", parent_ids
            )
            clauses.append(clause)

            if relation_senders:
                clause, temp_args = make_in_list_sql_clause(
                    txn.database_engine, "sender", relation_senders
                )
                clauses.append(clause)
                args.extend(temp_args)
            if relation_types:
                clause, temp_args = make_in_list_sql_clause(
                    txn.database_engine, "relation_type", relation_types
                )
                clauses.append(clause)
                args.extend(temp_args)

            txn.execute(sql % " AND ".join(clauses), args)

            return [row[0] for row in txn]

        return await self.db_pool.runInteraction(
            "get_if_events_have_relations", _get_if_events_have_relations
        )

    async def has_user_annotated_event(
        self, parent_id: str, event_type: str, aggregation_key: str, sender: str
    ) -> bool:
        """Check if a user has already annotated an event with the same key
        (e.g. already liked an event).

        Args:
            parent_id: The event being annotated
            event_type: The event type of the annotation
            aggregation_key: The aggregation key of the annotation
            sender: The sender of the annotation

        Returns:
            True if the event is already annotated.
        """

        sql = """
            SELECT 1 FROM event_relations
            INNER JOIN events USING (event_id)
            WHERE
                relates_to_id = ?
                AND relation_type = ?
                AND type = ?
                AND sender = ?
                AND aggregation_key = ?
            LIMIT 1;
        """

        def _get_if_user_has_annotated_event(txn: LoggingTransaction) -> bool:
            txn.execute(
                sql,
                (
                    parent_id,
                    RelationTypes.ANNOTATION,
                    event_type,
                    sender,
                    aggregation_key,
                ),
            )

            return bool(txn.fetchone())

        return await self.db_pool.runInteraction(
            "get_if_user_has_annotated_event", _get_if_user_has_annotated_event
        )


class RelationsStore(RelationsWorkerStore):
    pass