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
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
// Copyright 2021 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.

use std::{
    collections::{BTreeMap, BTreeSet, HashMap},
    sync::RwLock as StdRwLock,
};

use async_trait::async_trait;
use growable_bloom_filter::GrowableBloom;
use ruma::{
    canonical_json::{redact, RedactedBecause},
    events::{
        presence::PresenceEvent,
        receipt::{Receipt, ReceiptThread, ReceiptType},
        room::member::{MembershipState, StrippedRoomMemberEvent, SyncRoomMemberEvent},
        AnyGlobalAccountDataEvent, AnyRoomAccountDataEvent, AnyStrippedStateEvent,
        AnySyncStateEvent, GlobalAccountDataEventType, RoomAccountDataEventType, StateEventType,
    },
    serde::Raw,
    time::Instant,
    CanonicalJsonObject, EventId, OwnedEventId, OwnedMxcUri, OwnedRoomId, OwnedTransactionId,
    OwnedUserId, RoomId, RoomVersionId, TransactionId, UserId,
};
use tracing::{debug, instrument, trace, warn};

use super::{
    send_queue::{ChildTransactionId, QueuedRequest, SerializableEventContent},
    traits::{ComposerDraft, ServerCapabilities},
    DependentQueuedRequest, DependentQueuedRequestKind, QueuedRequestKind, Result, RoomInfo,
    StateChanges, StateStore, StoreError,
};
use crate::{
    deserialized_responses::RawAnySyncOrStrippedState, store::QueueWedgeError,
    MinimalRoomMemberEvent, RoomMemberships, StateStoreDataKey, StateStoreDataValue,
};

/// In-memory, non-persistent implementation of the `StateStore`.
///
/// Default if no other is configured at startup.
#[allow(clippy::type_complexity)]
#[derive(Debug, Default)]
pub struct MemoryStore {
    recently_visited_rooms: StdRwLock<HashMap<OwnedUserId, Vec<OwnedRoomId>>>,
    composer_drafts: StdRwLock<HashMap<OwnedRoomId, ComposerDraft>>,
    user_avatar_url: StdRwLock<HashMap<OwnedUserId, OwnedMxcUri>>,
    sync_token: StdRwLock<Option<String>>,
    server_capabilities: StdRwLock<Option<ServerCapabilities>>,
    filters: StdRwLock<HashMap<String, String>>,
    utd_hook_manager_data: StdRwLock<Option<GrowableBloom>>,
    account_data: StdRwLock<HashMap<GlobalAccountDataEventType, Raw<AnyGlobalAccountDataEvent>>>,
    profiles: StdRwLock<HashMap<OwnedRoomId, HashMap<OwnedUserId, MinimalRoomMemberEvent>>>,
    display_names: StdRwLock<HashMap<OwnedRoomId, HashMap<String, BTreeSet<OwnedUserId>>>>,
    members: StdRwLock<HashMap<OwnedRoomId, HashMap<OwnedUserId, MembershipState>>>,
    room_info: StdRwLock<HashMap<OwnedRoomId, RoomInfo>>,
    room_state: StdRwLock<
        HashMap<OwnedRoomId, HashMap<StateEventType, HashMap<String, Raw<AnySyncStateEvent>>>>,
    >,
    room_account_data: StdRwLock<
        HashMap<OwnedRoomId, HashMap<RoomAccountDataEventType, Raw<AnyRoomAccountDataEvent>>>,
    >,
    stripped_room_state: StdRwLock<
        HashMap<OwnedRoomId, HashMap<StateEventType, HashMap<String, Raw<AnyStrippedStateEvent>>>>,
    >,
    stripped_members: StdRwLock<HashMap<OwnedRoomId, HashMap<OwnedUserId, MembershipState>>>,
    presence: StdRwLock<HashMap<OwnedUserId, Raw<PresenceEvent>>>,
    room_user_receipts: StdRwLock<
        HashMap<
            OwnedRoomId,
            HashMap<(String, Option<String>), HashMap<OwnedUserId, (OwnedEventId, Receipt)>>,
        >,
    >,
    room_event_receipts: StdRwLock<
        HashMap<
            OwnedRoomId,
            HashMap<(String, Option<String>), HashMap<OwnedEventId, HashMap<OwnedUserId, Receipt>>>,
        >,
    >,
    custom: StdRwLock<HashMap<Vec<u8>, Vec<u8>>>,
    send_queue_events: StdRwLock<BTreeMap<OwnedRoomId, Vec<QueuedRequest>>>,
    dependent_send_queue_events: StdRwLock<BTreeMap<OwnedRoomId, Vec<DependentQueuedRequest>>>,
}

impl MemoryStore {
    /// Create a new empty MemoryStore
    pub fn new() -> Self {
        Self::default()
    }

    fn get_user_room_receipt_event_impl(
        &self,
        room_id: &RoomId,
        receipt_type: ReceiptType,
        thread: ReceiptThread,
        user_id: &UserId,
    ) -> Option<(OwnedEventId, Receipt)> {
        self.room_user_receipts
            .read()
            .unwrap()
            .get(room_id)?
            .get(&(receipt_type.to_string(), thread.as_str().map(ToOwned::to_owned)))?
            .get(user_id)
            .cloned()
    }

    fn get_event_room_receipt_events_impl(
        &self,
        room_id: &RoomId,
        receipt_type: ReceiptType,
        thread: ReceiptThread,
        event_id: &EventId,
    ) -> Option<Vec<(OwnedUserId, Receipt)>> {
        Some(
            self.room_event_receipts
                .read()
                .unwrap()
                .get(room_id)?
                .get(&(receipt_type.to_string(), thread.as_str().map(ToOwned::to_owned)))?
                .get(event_id)?
                .iter()
                .map(|(key, value)| (key.clone(), value.clone()))
                .collect(),
        )
    }
}

#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
impl StateStore for MemoryStore {
    type Error = StoreError;

    async fn get_kv_data(&self, key: StateStoreDataKey<'_>) -> Result<Option<StateStoreDataValue>> {
        Ok(match key {
            StateStoreDataKey::SyncToken => {
                self.sync_token.read().unwrap().clone().map(StateStoreDataValue::SyncToken)
            }
            StateStoreDataKey::ServerCapabilities => self
                .server_capabilities
                .read()
                .unwrap()
                .clone()
                .map(StateStoreDataValue::ServerCapabilities),
            StateStoreDataKey::Filter(filter_name) => self
                .filters
                .read()
                .unwrap()
                .get(filter_name)
                .cloned()
                .map(StateStoreDataValue::Filter),
            StateStoreDataKey::UserAvatarUrl(user_id) => self
                .user_avatar_url
                .read()
                .unwrap()
                .get(user_id)
                .cloned()
                .map(StateStoreDataValue::UserAvatarUrl),
            StateStoreDataKey::RecentlyVisitedRooms(user_id) => self
                .recently_visited_rooms
                .read()
                .unwrap()
                .get(user_id)
                .cloned()
                .map(StateStoreDataValue::RecentlyVisitedRooms),
            StateStoreDataKey::UtdHookManagerData => self
                .utd_hook_manager_data
                .read()
                .unwrap()
                .clone()
                .map(StateStoreDataValue::UtdHookManagerData),
            StateStoreDataKey::ComposerDraft(room_id) => self
                .composer_drafts
                .read()
                .unwrap()
                .get(room_id)
                .cloned()
                .map(StateStoreDataValue::ComposerDraft),
        })
    }

    async fn set_kv_data(
        &self,
        key: StateStoreDataKey<'_>,
        value: StateStoreDataValue,
    ) -> Result<()> {
        match key {
            StateStoreDataKey::SyncToken => {
                *self.sync_token.write().unwrap() =
                    Some(value.into_sync_token().expect("Session data not a sync token"))
            }
            StateStoreDataKey::Filter(filter_name) => {
                self.filters.write().unwrap().insert(
                    filter_name.to_owned(),
                    value.into_filter().expect("Session data not a filter"),
                );
            }
            StateStoreDataKey::UserAvatarUrl(user_id) => {
                self.user_avatar_url.write().unwrap().insert(
                    user_id.to_owned(),
                    value.into_user_avatar_url().expect("Session data not a user avatar url"),
                );
            }
            StateStoreDataKey::RecentlyVisitedRooms(user_id) => {
                self.recently_visited_rooms.write().unwrap().insert(
                    user_id.to_owned(),
                    value
                        .into_recently_visited_rooms()
                        .expect("Session data not a list of recently visited rooms"),
                );
            }
            StateStoreDataKey::UtdHookManagerData => {
                *self.utd_hook_manager_data.write().unwrap() = Some(
                    value
                        .into_utd_hook_manager_data()
                        .expect("Session data not the hook manager data"),
                );
            }
            StateStoreDataKey::ComposerDraft(room_id) => {
                self.composer_drafts.write().unwrap().insert(
                    room_id.to_owned(),
                    value.into_composer_draft().expect("Session data not a composer draft"),
                );
            }
            StateStoreDataKey::ServerCapabilities => {
                *self.server_capabilities.write().unwrap() = Some(
                    value
                        .into_server_capabilities()
                        .expect("Session data not containing server capabilities"),
                );
            }
        }

        Ok(())
    }

    async fn remove_kv_data(&self, key: StateStoreDataKey<'_>) -> Result<()> {
        match key {
            StateStoreDataKey::SyncToken => *self.sync_token.write().unwrap() = None,
            StateStoreDataKey::ServerCapabilities => {
                *self.server_capabilities.write().unwrap() = None
            }
            StateStoreDataKey::Filter(filter_name) => {
                self.filters.write().unwrap().remove(filter_name);
            }
            StateStoreDataKey::UserAvatarUrl(user_id) => {
                self.user_avatar_url.write().unwrap().remove(user_id);
            }
            StateStoreDataKey::RecentlyVisitedRooms(user_id) => {
                self.recently_visited_rooms.write().unwrap().remove(user_id);
            }
            StateStoreDataKey::UtdHookManagerData => {
                *self.utd_hook_manager_data.write().unwrap() = None
            }
            StateStoreDataKey::ComposerDraft(room_id) => {
                self.composer_drafts.write().unwrap().remove(room_id);
            }
        }
        Ok(())
    }

    #[instrument(skip(self, changes))]
    async fn save_changes(&self, changes: &StateChanges) -> Result<()> {
        let now = Instant::now();
        // these trace calls are to debug https://github.com/matrix-org/complement-crypto/issues/77
        trace!("starting");

        if let Some(s) = &changes.sync_token {
            *self.sync_token.write().unwrap() = Some(s.to_owned());
            trace!("assigned sync token");
        }

        trace!("profiles");
        {
            let mut profiles = self.profiles.write().unwrap();

            for (room, users) in &changes.profiles_to_delete {
                let Some(room_profiles) = profiles.get_mut(room) else {
                    continue;
                };
                for user in users {
                    room_profiles.remove(user);
                }
            }

            for (room, users) in &changes.profiles {
                for (user_id, profile) in users {
                    profiles
                        .entry(room.clone())
                        .or_default()
                        .insert(user_id.clone(), profile.clone());
                }
            }
        }

        trace!("ambiguity maps");
        for (room, map) in &changes.ambiguity_maps {
            for (display_name, display_names) in map {
                self.display_names
                    .write()
                    .unwrap()
                    .entry(room.clone())
                    .or_default()
                    .insert(display_name.clone(), display_names.clone());
            }
        }

        trace!("account data");
        {
            let mut account_data = self.account_data.write().unwrap();
            for (event_type, event) in &changes.account_data {
                account_data.insert(event_type.clone(), event.clone());
            }
        }

        trace!("room account data");
        {
            let mut room_account_data = self.room_account_data.write().unwrap();
            for (room, events) in &changes.room_account_data {
                for (event_type, event) in events {
                    room_account_data
                        .entry(room.clone())
                        .or_default()
                        .insert(event_type.clone(), event.clone());
                }
            }
        }

        trace!("room state");
        {
            let mut room_state = self.room_state.write().unwrap();
            trace!("room state: got room_state lock");
            let mut stripped_room_state = self.stripped_room_state.write().unwrap();
            trace!("room state: got stripped_room_state lock");
            let mut members = self.members.write().unwrap();
            trace!("room state: got members lock");
            let mut stripped_members = self.stripped_members.write().unwrap();
            trace!("room state: got stripped_members lock");

            for (room, event_types) in &changes.state {
                for (event_type, events) in event_types {
                    for (state_key, raw_event) in events {
                        room_state
                            .entry(room.clone())
                            .or_default()
                            .entry(event_type.clone())
                            .or_default()
                            .insert(state_key.to_owned(), raw_event.clone());
                        stripped_room_state.remove(room);

                        if *event_type == StateEventType::RoomMember {
                            let event = match raw_event.deserialize_as::<SyncRoomMemberEvent>() {
                                Ok(ev) => ev,
                                Err(e) => {
                                    let event_id: Option<String> =
                                        raw_event.get_field("event_id").ok().flatten();
                                    debug!(event_id, "Failed to deserialize member event: {e}");
                                    continue;
                                }
                            };

                            stripped_members.remove(room);

                            members
                                .entry(room.clone())
                                .or_default()
                                .insert(event.state_key().to_owned(), event.membership().clone());
                        }
                    }
                }
            }
        }

        trace!("room info");
        {
            let mut room_info = self.room_info.write().unwrap();
            for (room_id, info) in &changes.room_infos {
                room_info.insert(room_id.clone(), info.clone());
            }
        }

        trace!("presence");
        {
            let mut presence = self.presence.write().unwrap();
            for (sender, event) in &changes.presence {
                presence.insert(sender.clone(), event.clone());
            }
        }

        trace!("stripped state");
        {
            let mut stripped_room_state = self.stripped_room_state.write().unwrap();
            let mut stripped_members = self.stripped_members.write().unwrap();

            for (room, event_types) in &changes.stripped_state {
                for (event_type, events) in event_types {
                    for (state_key, raw_event) in events {
                        stripped_room_state
                            .entry(room.clone())
                            .or_default()
                            .entry(event_type.clone())
                            .or_default()
                            .insert(state_key.to_owned(), raw_event.clone());

                        if *event_type == StateEventType::RoomMember {
                            let event = match raw_event.deserialize_as::<StrippedRoomMemberEvent>()
                            {
                                Ok(ev) => ev,
                                Err(e) => {
                                    let event_id: Option<String> =
                                        raw_event.get_field("event_id").ok().flatten();
                                    debug!(
                                        event_id,
                                        "Failed to deserialize stripped member event: {e}"
                                    );
                                    continue;
                                }
                            };

                            stripped_members
                                .entry(room.clone())
                                .or_default()
                                .insert(event.state_key, event.content.membership.clone());
                        }
                    }
                }
            }
        }

        trace!("receipts");
        {
            let mut room_user_receipts = self.room_user_receipts.write().unwrap();
            let mut room_event_receipts = self.room_event_receipts.write().unwrap();

            for (room, content) in &changes.receipts {
                for (event_id, receipts) in &content.0 {
                    for (receipt_type, receipts) in receipts {
                        for (user_id, receipt) in receipts {
                            let thread = receipt.thread.as_str().map(ToOwned::to_owned);
                            // Add the receipt to the room user receipts
                            if let Some((old_event, _)) = room_user_receipts
                                .entry(room.clone())
                                .or_default()
                                .entry((receipt_type.to_string(), thread.clone()))
                                .or_default()
                                .insert(user_id.clone(), (event_id.clone(), receipt.clone()))
                            {
                                // Remove the old receipt from the room event receipts
                                if let Some(receipt_map) = room_event_receipts.get_mut(room) {
                                    if let Some(event_map) = receipt_map
                                        .get_mut(&(receipt_type.to_string(), thread.clone()))
                                    {
                                        if let Some(user_map) = event_map.get_mut(&old_event) {
                                            user_map.remove(user_id);
                                        }
                                    }
                                }
                            }

                            // Add the receipt to the room event receipts
                            room_event_receipts
                                .entry(room.clone())
                                .or_default()
                                .entry((receipt_type.to_string(), thread))
                                .or_default()
                                .entry(event_id.clone())
                                .or_default()
                                .insert(user_id.clone(), receipt.clone());
                        }
                    }
                }
            }
        }

        trace!("room info/state");
        {
            let room_info = self.room_info.read().unwrap();
            let mut room_state = self.room_state.write().unwrap();

            let make_room_version = |room_id| {
                room_info.get(room_id).and_then(|info| info.room_version().cloned()).unwrap_or_else(
                    || {
                        warn!(?room_id, "Unable to find the room version, assuming version 9");
                        RoomVersionId::V9
                    },
                )
            };

            for (room_id, redactions) in &changes.redactions {
                let mut room_version = None;
                if let Some(room) = room_state.get_mut(room_id) {
                    for ref_room_mu in room.values_mut() {
                        for raw_evt in ref_room_mu.values_mut() {
                            if let Ok(Some(event_id)) =
                                raw_evt.get_field::<OwnedEventId>("event_id")
                            {
                                if let Some(redaction) = redactions.get(&event_id) {
                                    let redacted = redact(
                                        raw_evt.deserialize_as::<CanonicalJsonObject>()?,
                                        room_version
                                            .get_or_insert_with(|| make_room_version(room_id)),
                                        Some(RedactedBecause::from_raw_event(redaction)?),
                                    )
                                    .map_err(StoreError::Redaction)?;
                                    *raw_evt = Raw::new(&redacted)?.cast();
                                }
                            }
                        }
                    }
                }
            }
        }

        debug!("Saved changes in {:?}", now.elapsed());

        Ok(())
    }

    async fn get_presence_event(&self, user_id: &UserId) -> Result<Option<Raw<PresenceEvent>>> {
        Ok(self.presence.read().unwrap().get(user_id).cloned())
    }

    async fn get_presence_events(
        &self,
        user_ids: &[OwnedUserId],
    ) -> Result<Vec<Raw<PresenceEvent>>> {
        let presence = self.presence.read().unwrap();
        Ok(user_ids.iter().filter_map(|user_id| presence.get(user_id).cloned()).collect())
    }

    async fn get_state_event(
        &self,
        room_id: &RoomId,
        event_type: StateEventType,
        state_key: &str,
    ) -> Result<Option<RawAnySyncOrStrippedState>> {
        Ok(self
            .get_state_events_for_keys(room_id, event_type, &[state_key])
            .await?
            .into_iter()
            .next())
    }

    async fn get_state_events(
        &self,
        room_id: &RoomId,
        event_type: StateEventType,
    ) -> Result<Vec<RawAnySyncOrStrippedState>> {
        fn get_events<T>(
            state_map: &HashMap<OwnedRoomId, HashMap<StateEventType, HashMap<String, Raw<T>>>>,
            room_id: &RoomId,
            event_type: &StateEventType,
            to_enum: fn(Raw<T>) -> RawAnySyncOrStrippedState,
        ) -> Option<Vec<RawAnySyncOrStrippedState>> {
            let state_events = state_map.get(room_id)?.get(event_type)?;
            Some(state_events.values().cloned().map(to_enum).collect())
        }

        let state_map = self.stripped_room_state.read().unwrap();
        Ok(get_events(&state_map, room_id, &event_type, RawAnySyncOrStrippedState::Stripped)
            .or_else(|| {
                drop(state_map); // release the lock on stripped_room_state
                get_events(
                    &self.room_state.read().unwrap(),
                    room_id,
                    &event_type,
                    RawAnySyncOrStrippedState::Sync,
                )
            })
            .unwrap_or_default())
    }

    async fn get_state_events_for_keys(
        &self,
        room_id: &RoomId,
        event_type: StateEventType,
        state_keys: &[&str],
    ) -> Result<Vec<RawAnySyncOrStrippedState>, Self::Error> {
        Ok(
            if let Some(stripped_state_events) = self
                .stripped_room_state
                .read()
                .unwrap()
                .get(room_id)
                .and_then(|events| events.get(&event_type))
            {
                state_keys
                    .iter()
                    .filter_map(|k| {
                        stripped_state_events
                            .get(*k)
                            .map(|e| RawAnySyncOrStrippedState::Stripped(e.clone()))
                    })
                    .collect()
            } else if let Some(sync_state_events) = self
                .room_state
                .read()
                .unwrap()
                .get(room_id)
                .and_then(|events| events.get(&event_type))
            {
                state_keys
                    .iter()
                    .filter_map(|k| {
                        sync_state_events
                            .get(*k)
                            .map(|e| RawAnySyncOrStrippedState::Sync(e.clone()))
                    })
                    .collect()
            } else {
                Vec::new()
            },
        )
    }

    async fn get_profile(
        &self,
        room_id: &RoomId,
        user_id: &UserId,
    ) -> Result<Option<MinimalRoomMemberEvent>> {
        Ok(self
            .profiles
            .read()
            .unwrap()
            .get(room_id)
            .and_then(|room_profiles| room_profiles.get(user_id))
            .cloned())
    }

    async fn get_profiles<'a>(
        &self,
        room_id: &RoomId,
        user_ids: &'a [OwnedUserId],
    ) -> Result<BTreeMap<&'a UserId, MinimalRoomMemberEvent>> {
        if user_ids.is_empty() {
            return Ok(BTreeMap::new());
        }

        let profiles = self.profiles.read().unwrap();
        let Some(room_profiles) = profiles.get(room_id) else {
            return Ok(BTreeMap::new());
        };

        Ok(user_ids
            .iter()
            .filter_map(|user_id| room_profiles.get(user_id).map(|p| (&**user_id, p.clone())))
            .collect())
    }

    #[instrument(skip(self, memberships))]
    async fn get_user_ids(
        &self,
        room_id: &RoomId,
        memberships: RoomMemberships,
    ) -> Result<Vec<OwnedUserId>> {
        /// Get the user IDs for the given room with the given memberships and
        /// stripped state.
        ///
        /// If `memberships` is empty, returns all user IDs in the room with the
        /// given stripped state.
        fn get_user_ids_inner(
            members: &HashMap<OwnedRoomId, HashMap<OwnedUserId, MembershipState>>,
            room_id: &RoomId,
            memberships: RoomMemberships,
        ) -> Vec<OwnedUserId> {
            members
                .get(room_id)
                .map(|members| {
                    members
                        .iter()
                        .filter_map(|(user_id, membership)| {
                            memberships.matches(membership).then_some(user_id)
                        })
                        .cloned()
                        .collect()
                })
                .unwrap_or_default()
        }
        let state_map = self.stripped_members.read().unwrap();
        let v = get_user_ids_inner(&state_map, room_id, memberships);
        if !v.is_empty() {
            return Ok(v);
        }
        drop(state_map); // release the stripped_members lock
        Ok(get_user_ids_inner(&self.members.read().unwrap(), room_id, memberships))
    }

    async fn get_room_infos(&self) -> Result<Vec<RoomInfo>> {
        Ok(self.room_info.read().unwrap().values().cloned().collect())
    }

    async fn get_users_with_display_name(
        &self,
        room_id: &RoomId,
        display_name: &str,
    ) -> Result<BTreeSet<OwnedUserId>> {
        Ok(self
            .display_names
            .read()
            .unwrap()
            .get(room_id)
            .and_then(|room_names| room_names.get(display_name).cloned())
            .unwrap_or_default())
    }

    async fn get_users_with_display_names<'a>(
        &self,
        room_id: &RoomId,
        display_names: &'a [String],
    ) -> Result<BTreeMap<&'a str, BTreeSet<OwnedUserId>>> {
        if display_names.is_empty() {
            return Ok(BTreeMap::new());
        }

        let read_guard = &self.display_names.read().unwrap();
        let Some(room_names) = read_guard.get(room_id) else {
            return Ok(BTreeMap::new());
        };

        Ok(display_names
            .iter()
            .filter_map(|n| room_names.get(n).map(|d| (n.as_str(), d.clone())))
            .collect())
    }

    async fn get_account_data_event(
        &self,
        event_type: GlobalAccountDataEventType,
    ) -> Result<Option<Raw<AnyGlobalAccountDataEvent>>> {
        Ok(self.account_data.read().unwrap().get(&event_type).cloned())
    }

    async fn get_room_account_data_event(
        &self,
        room_id: &RoomId,
        event_type: RoomAccountDataEventType,
    ) -> Result<Option<Raw<AnyRoomAccountDataEvent>>> {
        Ok(self
            .room_account_data
            .read()
            .unwrap()
            .get(room_id)
            .and_then(|m| m.get(&event_type))
            .cloned())
    }

    async fn get_user_room_receipt_event(
        &self,
        room_id: &RoomId,
        receipt_type: ReceiptType,
        thread: ReceiptThread,
        user_id: &UserId,
    ) -> Result<Option<(OwnedEventId, Receipt)>> {
        Ok(self.get_user_room_receipt_event_impl(room_id, receipt_type, thread, user_id))
    }

    async fn get_event_room_receipt_events(
        &self,
        room_id: &RoomId,
        receipt_type: ReceiptType,
        thread: ReceiptThread,
        event_id: &EventId,
    ) -> Result<Vec<(OwnedUserId, Receipt)>> {
        Ok(self
            .get_event_room_receipt_events_impl(room_id, receipt_type, thread, event_id)
            .unwrap_or_default())
    }

    async fn get_custom_value(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
        Ok(self.custom.read().unwrap().get(key).cloned())
    }

    async fn set_custom_value(&self, key: &[u8], value: Vec<u8>) -> Result<Option<Vec<u8>>> {
        Ok(self.custom.write().unwrap().insert(key.to_vec(), value))
    }

    async fn remove_custom_value(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
        Ok(self.custom.write().unwrap().remove(key))
    }

    async fn remove_room(&self, room_id: &RoomId) -> Result<()> {
        self.profiles.write().unwrap().remove(room_id);
        self.display_names.write().unwrap().remove(room_id);
        self.members.write().unwrap().remove(room_id);
        self.room_info.write().unwrap().remove(room_id);
        self.room_state.write().unwrap().remove(room_id);
        self.room_account_data.write().unwrap().remove(room_id);
        self.stripped_room_state.write().unwrap().remove(room_id);
        self.stripped_members.write().unwrap().remove(room_id);
        self.room_user_receipts.write().unwrap().remove(room_id);
        self.room_event_receipts.write().unwrap().remove(room_id);

        Ok(())
    }

    async fn save_send_queue_request(
        &self,
        room_id: &RoomId,
        transaction_id: OwnedTransactionId,
        content: SerializableEventContent,
    ) -> Result<(), Self::Error> {
        self.send_queue_events.write().unwrap().entry(room_id.to_owned()).or_default().push(
            QueuedRequest {
                kind: QueuedRequestKind::Event { content },
                transaction_id,
                error: None,
            },
        );
        Ok(())
    }

    async fn update_send_queue_request(
        &self,
        room_id: &RoomId,
        transaction_id: &TransactionId,
        content: SerializableEventContent,
    ) -> Result<bool, Self::Error> {
        if let Some(entry) = self
            .send_queue_events
            .write()
            .unwrap()
            .entry(room_id.to_owned())
            .or_default()
            .iter_mut()
            .find(|item| item.transaction_id == transaction_id)
        {
            entry.kind = QueuedRequestKind::Event { content };
            entry.error = None;
            Ok(true)
        } else {
            Ok(false)
        }
    }

    async fn remove_send_queue_request(
        &self,
        room_id: &RoomId,
        transaction_id: &TransactionId,
    ) -> Result<bool, Self::Error> {
        let mut q = self.send_queue_events.write().unwrap();

        let entry = q.get_mut(room_id);
        if let Some(entry) = entry {
            // Find the event by id in its room queue, and remove it if present.
            if let Some(pos) = entry.iter().position(|item| item.transaction_id == transaction_id) {
                entry.remove(pos);
                // And if this was the last event before removal, remove the entire room entry.
                if entry.is_empty() {
                    q.remove(room_id);
                }
                return Ok(true);
            }
        }

        Ok(false)
    }

    async fn load_send_queue_requests(
        &self,
        room_id: &RoomId,
    ) -> Result<Vec<QueuedRequest>, Self::Error> {
        Ok(self.send_queue_events.write().unwrap().entry(room_id.to_owned()).or_default().clone())
    }

    async fn update_send_queue_request_status(
        &self,
        room_id: &RoomId,
        transaction_id: &TransactionId,
        error: Option<QueueWedgeError>,
    ) -> Result<(), Self::Error> {
        if let Some(entry) = self
            .send_queue_events
            .write()
            .unwrap()
            .entry(room_id.to_owned())
            .or_default()
            .iter_mut()
            .find(|item| item.transaction_id == transaction_id)
        {
            entry.error = error;
        }
        Ok(())
    }

    async fn load_rooms_with_unsent_requests(&self) -> Result<Vec<OwnedRoomId>, Self::Error> {
        Ok(self.send_queue_events.read().unwrap().keys().cloned().collect())
    }

    async fn save_dependent_queued_request(
        &self,
        room: &RoomId,
        parent_transaction_id: &TransactionId,
        own_transaction_id: ChildTransactionId,
        content: DependentQueuedRequestKind,
    ) -> Result<(), Self::Error> {
        self.dependent_send_queue_events.write().unwrap().entry(room.to_owned()).or_default().push(
            DependentQueuedRequest {
                kind: content,
                parent_transaction_id: parent_transaction_id.to_owned(),
                own_transaction_id,
                event_id: None,
            },
        );
        Ok(())
    }

    async fn update_dependent_queued_request(
        &self,
        room: &RoomId,
        parent_txn_id: &TransactionId,
        event_id: OwnedEventId,
    ) -> Result<usize, Self::Error> {
        let mut dependent_send_queue_events = self.dependent_send_queue_events.write().unwrap();
        let dependents = dependent_send_queue_events.entry(room.to_owned()).or_default();
        let mut num_updated = 0;
        for d in dependents.iter_mut().filter(|item| item.parent_transaction_id == parent_txn_id) {
            d.event_id = Some(event_id.clone());
            num_updated += 1;
        }
        Ok(num_updated)
    }

    async fn remove_dependent_queued_request(
        &self,
        room: &RoomId,
        txn_id: &ChildTransactionId,
    ) -> Result<bool, Self::Error> {
        let mut dependent_send_queue_events = self.dependent_send_queue_events.write().unwrap();
        let dependents = dependent_send_queue_events.entry(room.to_owned()).or_default();
        if let Some(pos) = dependents.iter().position(|item| item.own_transaction_id == *txn_id) {
            dependents.remove(pos);
            Ok(true)
        } else {
            Ok(false)
        }
    }

    /// List all the dependent send queue events.
    ///
    /// This returns absolutely all the dependent send queue events, whether
    /// they have an event id or not.
    async fn load_dependent_queued_requests(
        &self,
        room: &RoomId,
    ) -> Result<Vec<DependentQueuedRequest>, Self::Error> {
        Ok(self.dependent_send_queue_events.read().unwrap().get(room).cloned().unwrap_or_default())
    }
}

#[cfg(test)]
mod tests {
    use super::{MemoryStore, Result, StateStore};

    async fn get_store() -> Result<impl StateStore> {
        Ok(MemoryStore::new())
    }

    statestore_integration_tests!();
}