This repository has been archived by the owner on Apr 26, 2024. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 2.1k
/
sync.py
2399 lines (2048 loc) · 94.6 KB
/
sync.py
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
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
# Copyright 2015-2021 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.
import itertools
import logging
from typing import (
TYPE_CHECKING,
Any,
Collection,
Dict,
FrozenSet,
List,
Optional,
Set,
Tuple,
)
import attr
from prometheus_client import Counter
from synapse.api.constants import AccountDataTypes, EventTypes, Membership, ReceiptTypes
from synapse.api.filtering import FilterCollection
from synapse.api.presence import UserPresenceState
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.events import EventBase
from synapse.logging.context import current_context
from synapse.logging.opentracing import SynapseTags, log_kv, set_tag, start_active_span
from synapse.push.clientformat import format_push_rules_for_user
from synapse.storage.roommember import MemberSummary
from synapse.storage.state import StateFilter
from synapse.types import (
JsonDict,
MutableStateMap,
Requester,
RoomStreamToken,
StateMap,
StreamToken,
UserID,
)
from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.caches.lrucache import LruCache
from synapse.util.caches.response_cache import ResponseCache, ResponseCacheContext
from synapse.util.metrics import Measure, measure_func
from synapse.visibility import filter_events_for_client
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
# Debug logger for https://github.com/matrix-org/synapse/issues/4422
issue4422_logger = logging.getLogger("synapse.handler.sync.4422_debug")
# Counts the number of times we returned a non-empty sync. `type` is one of
# "initial_sync", "full_state_sync" or "incremental_sync", `lazy_loaded` is
# "true" or "false" depending on if the request asked for lazy loaded members or
# not.
non_empty_sync_counter = Counter(
"synapse_handlers_sync_nonempty_total",
"Count of non empty sync responses. type is initial_sync/full_state_sync"
"/incremental_sync. lazy_loaded indicates if lazy loaded members were "
"enabled for that request.",
["type", "lazy_loaded"],
)
# Store the cache that tracks which lazy-loaded members have been sent to a given
# client for no more than 30 minutes.
LAZY_LOADED_MEMBERS_CACHE_MAX_AGE = 30 * 60 * 1000
# Remember the last 100 members we sent to a client for the purposes of
# avoiding redundantly sending the same lazy-loaded members to the client
LAZY_LOADED_MEMBERS_CACHE_MAX_SIZE = 100
SyncRequestKey = Tuple[Any, ...]
@attr.s(slots=True, frozen=True, auto_attribs=True)
class SyncConfig:
user: UserID
filter_collection: FilterCollection
is_guest: bool
request_key: SyncRequestKey
device_id: Optional[str]
@attr.s(slots=True, frozen=True, auto_attribs=True)
class TimelineBatch:
prev_batch: StreamToken
events: List[EventBase]
limited: bool
def __bool__(self) -> bool:
"""Make the result appear empty if there are no updates. This is used
to tell if room needs to be part of the sync result.
"""
return bool(self.events)
# We can't freeze this class, because we need to update it after it's instantiated to
# update its unread count. This is because we calculate the unread count for a room only
# if there are updates for it, which we check after the instance has been created.
# This should not be a big deal because we update the notification counts afterwards as
# well anyway.
@attr.s(slots=True, auto_attribs=True)
class JoinedSyncResult:
room_id: str
timeline: TimelineBatch
state: StateMap[EventBase]
ephemeral: List[JsonDict]
account_data: List[JsonDict]
unread_notifications: JsonDict
summary: Optional[JsonDict]
unread_count: int
def __bool__(self) -> bool:
"""Make the result appear empty if there are no updates. This is used
to tell if room needs to be part of the sync result.
"""
return bool(
self.timeline
or self.state
or self.ephemeral
or self.account_data
# nb the notification count does not, er, count: if there's nothing
# else in the result, we don't need to send it.
)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class ArchivedSyncResult:
room_id: str
timeline: TimelineBatch
state: StateMap[EventBase]
account_data: List[JsonDict]
def __bool__(self) -> bool:
"""Make the result appear empty if there are no updates. This is used
to tell if room needs to be part of the sync result.
"""
return bool(self.timeline or self.state or self.account_data)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class InvitedSyncResult:
room_id: str
invite: EventBase
def __bool__(self) -> bool:
"""Invited rooms should always be reported to the client"""
return True
@attr.s(slots=True, frozen=True, auto_attribs=True)
class KnockedSyncResult:
room_id: str
knock: EventBase
def __bool__(self) -> bool:
"""Knocked rooms should always be reported to the client"""
return True
@attr.s(slots=True, frozen=True, auto_attribs=True)
class GroupsSyncResult:
join: JsonDict
invite: JsonDict
leave: JsonDict
def __bool__(self) -> bool:
return bool(self.join or self.invite or self.leave)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class DeviceLists:
"""
Attributes:
changed: List of user_ids whose devices may have changed
left: List of user_ids whose devices we no longer track
"""
changed: Collection[str]
left: Collection[str]
def __bool__(self) -> bool:
return bool(self.changed or self.left)
@attr.s(slots=True, auto_attribs=True)
class _RoomChanges:
"""The set of room entries to include in the sync, plus the set of joined
and left room IDs since last sync.
"""
room_entries: List["RoomSyncResultBuilder"]
invited: List[InvitedSyncResult]
knocked: List[KnockedSyncResult]
newly_joined_rooms: List[str]
newly_left_rooms: List[str]
@attr.s(slots=True, frozen=True, auto_attribs=True)
class SyncResult:
"""
Attributes:
next_batch: Token for the next sync
presence: List of presence events for the user.
account_data: List of account_data events for the user.
joined: JoinedSyncResult for each joined room.
invited: InvitedSyncResult for each invited room.
knocked: KnockedSyncResult for each knocked on room.
archived: ArchivedSyncResult for each archived room.
to_device: List of direct messages for the device.
device_lists: List of user_ids whose devices have changed
device_one_time_keys_count: Dict of algorithm to count for one time keys
for this device
device_unused_fallback_key_types: List of key types that have an unused fallback
key
groups: Group updates, if any
"""
next_batch: StreamToken
presence: List[UserPresenceState]
account_data: List[JsonDict]
joined: List[JoinedSyncResult]
invited: List[InvitedSyncResult]
knocked: List[KnockedSyncResult]
archived: List[ArchivedSyncResult]
to_device: List[JsonDict]
device_lists: DeviceLists
device_one_time_keys_count: JsonDict
device_unused_fallback_key_types: List[str]
groups: Optional[GroupsSyncResult]
def __bool__(self) -> bool:
"""Make the result appear empty if there are no updates. This is used
to tell if the notifier needs to wait for more events when polling for
events.
"""
return bool(
self.presence
or self.joined
or self.invited
or self.knocked
or self.archived
or self.account_data
or self.to_device
or self.device_lists
or self.groups
)
class SyncHandler:
def __init__(self, hs: "HomeServer"):
self.hs_config = hs.config
self.store = hs.get_datastore()
self.notifier = hs.get_notifier()
self.presence_handler = hs.get_presence_handler()
self.event_sources = hs.get_event_sources()
self.clock = hs.get_clock()
self.state = hs.get_state_handler()
self.auth = hs.get_auth()
self.storage = hs.get_storage()
self.state_store = self.storage.state
# TODO: flush cache entries on subsequent sync request.
# Once we get the next /sync request (ie, one with the same access token
# that sets 'since' to 'next_batch'), we know that device won't need a
# cached result any more, and we could flush the entry from the cache to save
# memory.
self.response_cache: ResponseCache[SyncRequestKey] = ResponseCache(
hs.get_clock(),
"sync",
timeout_ms=hs.config.caches.sync_response_cache_duration,
)
# ExpiringCache((User, Device)) -> LruCache(user_id => event_id)
self.lazy_loaded_members_cache: ExpiringCache[
Tuple[str, Optional[str]], LruCache[str, str]
] = ExpiringCache(
"lazy_loaded_members_cache",
self.clock,
max_len=0,
expiry_ms=LAZY_LOADED_MEMBERS_CACHE_MAX_AGE,
)
async def wait_for_sync_for_user(
self,
requester: Requester,
sync_config: SyncConfig,
since_token: Optional[StreamToken] = None,
timeout: int = 0,
full_state: bool = False,
) -> SyncResult:
"""Get the sync for a client if we have new data for it now. Otherwise
wait for new data to arrive on the server. If the timeout expires, then
return an empty sync result.
"""
# If the user is not part of the mau group, then check that limits have
# not been exceeded (if not part of the group by this point, almost certain
# auth_blocking will occur)
user_id = sync_config.user.to_string()
await self.auth.check_auth_blocking(requester=requester)
res = await self.response_cache.wrap(
sync_config.request_key,
self._wait_for_sync_for_user,
sync_config,
since_token,
timeout,
full_state,
cache_context=True,
)
logger.debug("Returning sync response for %s", user_id)
return res
async def _wait_for_sync_for_user(
self,
sync_config: SyncConfig,
since_token: Optional[StreamToken],
timeout: int,
full_state: bool,
cache_context: ResponseCacheContext[SyncRequestKey],
) -> SyncResult:
"""The start of the machinery that produces a /sync response.
See https://spec.matrix.org/v1.1/client-server-api/#syncing for full details.
This method does high-level bookkeeping:
- tracking the kind of sync in the logging context
- deleting any to_device messages whose delivery has been acknowledged.
- deciding if we should dispatch an instant or delayed response
- marking the sync as being lazily loaded, if appropriate
Computing the body of the response begins in the next method,
`current_sync_for_user`.
"""
if since_token is None:
sync_type = "initial_sync"
elif full_state:
sync_type = "full_state_sync"
else:
sync_type = "incremental_sync"
context = current_context()
if context:
context.tag = sync_type
# if we have a since token, delete any to-device messages before that token
# (since we now know that the device has received them)
if since_token is not None:
since_stream_id = since_token.to_device_key
deleted = await self.store.delete_messages_for_device(
sync_config.user.to_string(), sync_config.device_id, since_stream_id
)
logger.debug(
"Deleted %d to-device messages up to %d", deleted, since_stream_id
)
if timeout == 0 or since_token is None or full_state:
# we are going to return immediately, so don't bother calling
# notifier.wait_for_events.
result: SyncResult = await self.current_sync_for_user(
sync_config, since_token, full_state=full_state
)
else:
# Otherwise, we wait for something to happen and report it to the user.
async def current_sync_callback(
before_token: StreamToken, after_token: StreamToken
) -> SyncResult:
return await self.current_sync_for_user(sync_config, since_token)
result = await self.notifier.wait_for_events(
sync_config.user.to_string(),
timeout,
current_sync_callback,
from_token=since_token,
)
# if nothing has happened in any of the users' rooms since /sync was called,
# the resultant next_batch will be the same as since_token (since the result
# is generated when wait_for_events is first called, and not regenerated
# when wait_for_events times out).
#
# If that happens, we mustn't cache it, so that when the client comes back
# with the same cache token, we don't immediately return the same empty
# result, causing a tightloop. (#8518)
if result.next_batch == since_token:
cache_context.should_cache = False
if result:
if sync_config.filter_collection.lazy_load_members():
lazy_loaded = "true"
else:
lazy_loaded = "false"
non_empty_sync_counter.labels(sync_type, lazy_loaded).inc()
return result
async def current_sync_for_user(
self,
sync_config: SyncConfig,
since_token: Optional[StreamToken] = None,
full_state: bool = False,
) -> SyncResult:
"""Generates the response body of a sync result, represented as a SyncResult.
This is a wrapper around `generate_sync_result` which starts an open tracing
span to track the sync. See `generate_sync_result` for the next part of your
indoctrination.
"""
with start_active_span("current_sync_for_user"):
log_kv({"since_token": since_token})
sync_result = await self.generate_sync_result(
sync_config, since_token, full_state
)
set_tag(SynapseTags.SYNC_RESULT, bool(sync_result))
return sync_result
async def push_rules_for_user(self, user: UserID) -> JsonDict:
user_id = user.to_string()
rules = await self.store.get_push_rules_for_user(user_id)
rules = format_push_rules_for_user(user, rules)
return rules
async def ephemeral_by_room(
self,
sync_result_builder: "SyncResultBuilder",
now_token: StreamToken,
since_token: Optional[StreamToken] = None,
) -> Tuple[StreamToken, Dict[str, List[JsonDict]]]:
"""Get the ephemeral events for each room the user is in
Args:
sync_result_builder
now_token: Where the server is currently up to.
since_token: Where the server was when the client
last synced.
Returns:
A tuple of the now StreamToken, updated to reflect the which typing
events are included, and a dict mapping from room_id to a list of
typing events for that room.
"""
sync_config = sync_result_builder.sync_config
with Measure(self.clock, "ephemeral_by_room"):
typing_key = since_token.typing_key if since_token else 0
room_ids = sync_result_builder.joined_room_ids
typing_source = self.event_sources.sources.typing
typing, typing_key = await typing_source.get_new_events(
user=sync_config.user,
from_key=typing_key,
limit=sync_config.filter_collection.ephemeral_limit(),
room_ids=room_ids,
is_guest=sync_config.is_guest,
)
now_token = now_token.copy_and_replace("typing_key", typing_key)
ephemeral_by_room: JsonDict = {}
for event in typing:
# we want to exclude the room_id from the event, but modifying the
# result returned by the event source is poor form (it might cache
# the object)
room_id = event["room_id"]
event_copy = {k: v for (k, v) in event.items() if k != "room_id"}
ephemeral_by_room.setdefault(room_id, []).append(event_copy)
receipt_key = since_token.receipt_key if since_token else 0
receipt_source = self.event_sources.sources.receipt
receipts, receipt_key = await receipt_source.get_new_events(
user=sync_config.user,
from_key=receipt_key,
limit=sync_config.filter_collection.ephemeral_limit(),
room_ids=room_ids,
is_guest=sync_config.is_guest,
)
now_token = now_token.copy_and_replace("receipt_key", receipt_key)
for event in receipts:
room_id = event["room_id"]
# exclude room id, as above
event_copy = {k: v for (k, v) in event.items() if k != "room_id"}
ephemeral_by_room.setdefault(room_id, []).append(event_copy)
return now_token, ephemeral_by_room
async def _load_filtered_recents(
self,
room_id: str,
sync_config: SyncConfig,
now_token: StreamToken,
since_token: Optional[StreamToken] = None,
potential_recents: Optional[List[EventBase]] = None,
newly_joined_room: bool = False,
) -> TimelineBatch:
with Measure(self.clock, "load_filtered_recents"):
timeline_limit = sync_config.filter_collection.timeline_limit()
block_all_timeline = (
sync_config.filter_collection.blocks_all_room_timeline()
)
if (
potential_recents is None
or newly_joined_room
or timeline_limit < len(potential_recents)
):
limited = True
else:
limited = False
log_kv({"limited": limited})
if potential_recents:
recents = await sync_config.filter_collection.filter_room_timeline(
potential_recents
)
log_kv({"recents_after_sync_filtering": len(recents)})
# We check if there are any state events, if there are then we pass
# all current state events to the filter_events function. This is to
# ensure that we always include current state in the timeline
current_state_ids: FrozenSet[str] = frozenset()
if any(e.is_state() for e in recents):
current_state_ids_map = await self.store.get_current_state_ids(
room_id
)
current_state_ids = frozenset(current_state_ids_map.values())
recents = await filter_events_for_client(
self.storage,
sync_config.user.to_string(),
recents,
always_include_ids=current_state_ids,
)
log_kv({"recents_after_visibility_filtering": len(recents)})
else:
recents = []
if not limited or block_all_timeline:
prev_batch_token = now_token
if recents:
room_key = recents[0].internal_metadata.before
prev_batch_token = now_token.copy_and_replace("room_key", room_key)
return TimelineBatch(
events=recents, prev_batch=prev_batch_token, limited=False
)
filtering_factor = 2
load_limit = max(timeline_limit * filtering_factor, 10)
max_repeat = 5 # Only try a few times per room, otherwise
room_key = now_token.room_key
end_key = room_key
since_key = None
if since_token and not newly_joined_room:
since_key = since_token.room_key
while limited and len(recents) < timeline_limit and max_repeat:
# If we have a since_key then we are trying to get any events
# that have happened since `since_key` up to `end_key`, so we
# can just use `get_room_events_stream_for_room`.
# Otherwise, we want to return the last N events in the room
# in topological ordering.
if since_key:
events, end_key = await self.store.get_room_events_stream_for_room(
room_id,
limit=load_limit + 1,
from_key=since_key,
to_key=end_key,
)
else:
events, end_key = await self.store.get_recent_events_for_room(
room_id, limit=load_limit + 1, end_token=end_key
)
log_kv({"loaded_recents": len(events)})
loaded_recents = (
await sync_config.filter_collection.filter_room_timeline(events)
)
log_kv({"loaded_recents_after_sync_filtering": len(loaded_recents)})
# We check if there are any state events, if there are then we pass
# all current state events to the filter_events function. This is to
# ensure that we always include current state in the timeline
current_state_ids = frozenset()
if any(e.is_state() for e in loaded_recents):
current_state_ids_map = await self.store.get_current_state_ids(
room_id
)
current_state_ids = frozenset(current_state_ids_map.values())
loaded_recents = await filter_events_for_client(
self.storage,
sync_config.user.to_string(),
loaded_recents,
always_include_ids=current_state_ids,
)
log_kv({"loaded_recents_after_client_filtering": len(loaded_recents)})
loaded_recents.extend(recents)
recents = loaded_recents
if len(events) <= load_limit:
limited = False
break
max_repeat -= 1
if len(recents) > timeline_limit:
limited = True
recents = recents[-timeline_limit:]
room_key = recents[0].internal_metadata.before
prev_batch_token = now_token.copy_and_replace("room_key", room_key)
return TimelineBatch(
events=recents,
prev_batch=prev_batch_token,
limited=limited or newly_joined_room,
)
async def get_state_after_event(
self, event: EventBase, state_filter: Optional[StateFilter] = None
) -> StateMap[str]:
"""
Get the room state after the given event
Args:
event: event of interest
state_filter: The state filter used to fetch state from the database.
"""
state_ids = await self.state_store.get_state_ids_for_event(
event.event_id, state_filter=state_filter or StateFilter.all()
)
if event.is_state():
state_ids = dict(state_ids)
state_ids[(event.type, event.state_key)] = event.event_id
return state_ids
async def get_state_at(
self,
room_id: str,
stream_position: StreamToken,
state_filter: Optional[StateFilter] = None,
) -> StateMap[str]:
"""Get the room state at a particular stream position
Args:
room_id: room for which to get state
stream_position: point at which to get state
state_filter: The state filter used to fetch state from the database.
"""
# FIXME this claims to get the state at a stream position, but
# get_recent_events_for_room operates by topo ordering. This therefore
# does not reliably give you the state at the given stream position.
# (https://github.com/matrix-org/synapse/issues/3305)
last_events, _ = await self.store.get_recent_events_for_room(
room_id, end_token=stream_position.room_key, limit=1
)
if last_events:
last_event = last_events[-1]
state = await self.get_state_after_event(
last_event, state_filter=state_filter or StateFilter.all()
)
else:
# no events in this room - so presumably no state
state = {}
return state
async def compute_summary(
self,
room_id: str,
sync_config: SyncConfig,
batch: TimelineBatch,
state: MutableStateMap[EventBase],
now_token: StreamToken,
) -> Optional[JsonDict]:
"""Works out a room summary block for this room, summarising the number
of joined members in the room, and providing the 'hero' members if the
room has no name so clients can consistently name rooms. Also adds
state events to 'state' if needed to describe the heroes.
Args
room_id
sync_config
batch: The timeline batch for the room that will be sent to the user.
state: State as returned by compute_state_delta
now_token: Token of the end of the current batch.
"""
# FIXME: we could/should get this from room_stats when matthew/stats lands
# FIXME: this promulgates https://github.com/matrix-org/synapse/issues/3305
last_events, _ = await self.store.get_recent_event_ids_for_room(
room_id, end_token=now_token.room_key, limit=1
)
if not last_events:
return None
last_event = last_events[-1]
state_ids = await self.state_store.get_state_ids_for_event(
last_event.event_id,
state_filter=StateFilter.from_types(
[(EventTypes.Name, ""), (EventTypes.CanonicalAlias, "")]
),
)
# this is heavily cached, thus: fast.
details = await self.store.get_room_summary(room_id)
name_id = state_ids.get((EventTypes.Name, ""))
canonical_alias_id = state_ids.get((EventTypes.CanonicalAlias, ""))
summary: JsonDict = {}
empty_ms = MemberSummary([], 0)
# TODO: only send these when they change.
summary["m.joined_member_count"] = details.get(Membership.JOIN, empty_ms).count
summary["m.invited_member_count"] = details.get(
Membership.INVITE, empty_ms
).count
# if the room has a name or canonical_alias set, we can skip
# calculating heroes. Empty strings are falsey, so we check
# for the "name" value and default to an empty string.
if name_id:
name = await self.store.get_event(name_id, allow_none=True)
if name and name.content.get("name"):
return summary
if canonical_alias_id:
canonical_alias = await self.store.get_event(
canonical_alias_id, allow_none=True
)
if canonical_alias and canonical_alias.content.get("alias"):
return summary
me = sync_config.user.to_string()
joined_user_ids = [
r[0] for r in details.get(Membership.JOIN, empty_ms).members if r[0] != me
]
invited_user_ids = [
r[0] for r in details.get(Membership.INVITE, empty_ms).members if r[0] != me
]
gone_user_ids = [
r[0] for r in details.get(Membership.LEAVE, empty_ms).members if r[0] != me
] + [r[0] for r in details.get(Membership.BAN, empty_ms).members if r[0] != me]
# FIXME: only build up a member_ids list for our heroes
member_ids = {}
for membership in (
Membership.JOIN,
Membership.INVITE,
Membership.LEAVE,
Membership.BAN,
):
for user_id, event_id in details.get(membership, empty_ms).members:
member_ids[user_id] = event_id
# FIXME: order by stream ordering rather than as returned by SQL
if joined_user_ids or invited_user_ids:
summary["m.heroes"] = sorted(joined_user_ids + invited_user_ids)[0:5]
else:
summary["m.heroes"] = sorted(gone_user_ids)[0:5]
if not sync_config.filter_collection.lazy_load_members():
return summary
# ensure we send membership events for heroes if needed
cache_key = (sync_config.user.to_string(), sync_config.device_id)
cache = self.get_lazy_loaded_members_cache(cache_key)
# track which members the client should already know about via LL:
# Ones which are already in state...
existing_members = {
user_id for (typ, user_id) in state.keys() if typ == EventTypes.Member
}
# ...or ones which are in the timeline...
for ev in batch.events:
if ev.type == EventTypes.Member:
existing_members.add(ev.state_key)
# ...and then ensure any missing ones get included in state.
missing_hero_event_ids = [
member_ids[hero_id]
for hero_id in summary["m.heroes"]
if (
cache.get(hero_id) != member_ids[hero_id]
and hero_id not in existing_members
)
]
missing_hero_state = await self.store.get_events(missing_hero_event_ids)
for s in missing_hero_state.values():
cache.set(s.state_key, s.event_id)
state[(EventTypes.Member, s.state_key)] = s
return summary
def get_lazy_loaded_members_cache(
self, cache_key: Tuple[str, Optional[str]]
) -> LruCache[str, str]:
cache: Optional[LruCache[str, str]] = self.lazy_loaded_members_cache.get(
cache_key
)
if cache is None:
logger.debug("creating LruCache for %r", cache_key)
cache = LruCache(LAZY_LOADED_MEMBERS_CACHE_MAX_SIZE)
self.lazy_loaded_members_cache[cache_key] = cache
else:
logger.debug("found LruCache for %r", cache_key)
return cache
async def compute_state_delta(
self,
room_id: str,
batch: TimelineBatch,
sync_config: SyncConfig,
since_token: Optional[StreamToken],
now_token: StreamToken,
full_state: bool,
) -> MutableStateMap[EventBase]:
"""Works out the difference in state between the start of the timeline
and the previous sync.
Args:
room_id:
batch: The timeline batch for the room that will be sent to the user.
sync_config:
since_token: Token of the end of the previous batch. May be None.
now_token: Token of the end of the current batch.
full_state: Whether to force returning the full state.
"""
# TODO(mjark) Check if the state events were received by the server
# after the previous sync, since we need to include those state
# updates even if they occurred logically before the previous event.
# TODO(mjark) Check for new redactions in the state events.
with Measure(self.clock, "compute_state_delta"):
members_to_fetch = None
lazy_load_members = sync_config.filter_collection.lazy_load_members()
include_redundant_members = (
sync_config.filter_collection.include_redundant_members()
)
if lazy_load_members:
# We only request state for the members needed to display the
# timeline:
members_to_fetch = {
event.sender # FIXME: we also care about invite targets etc.
for event in batch.events
}
if full_state:
# always make sure we LL ourselves so we know we're in the room
# (if we are) to fix https://github.com/vector-im/riot-web/issues/7209
# We only need apply this on full state syncs given we disabled
# LL for incr syncs in #3840.
members_to_fetch.add(sync_config.user.to_string())
state_filter = StateFilter.from_lazy_load_member_list(members_to_fetch)
else:
state_filter = StateFilter.all()
timeline_state = {
(event.type, event.state_key): event.event_id
for event in batch.events
if event.is_state()
}
if full_state:
if batch:
current_state_ids = await self.state_store.get_state_ids_for_event(
batch.events[-1].event_id, state_filter=state_filter
)
state_ids = await self.state_store.get_state_ids_for_event(
batch.events[0].event_id, state_filter=state_filter
)
else:
current_state_ids = await self.get_state_at(
room_id, stream_position=now_token, state_filter=state_filter
)
state_ids = current_state_ids
state_ids = _calculate_state(
timeline_contains=timeline_state,
timeline_start=state_ids,
previous={},
current=current_state_ids,
lazy_load_members=lazy_load_members,
)
elif batch.limited:
if batch:
state_at_timeline_start = (
await self.state_store.get_state_ids_for_event(
batch.events[0].event_id, state_filter=state_filter
)
)
else:
# We can get here if the user has ignored the senders of all
# the recent events.
state_at_timeline_start = await self.get_state_at(
room_id, stream_position=now_token, state_filter=state_filter
)
# for now, we disable LL for gappy syncs - see
# https://github.com/vector-im/riot-web/issues/7211#issuecomment-419976346
# N.B. this slows down incr syncs as we are now processing way
# more state in the server than if we were LLing.
#
# We still have to filter timeline_start to LL entries (above) in order
# for _calculate_state's LL logic to work, as we have to include LL
# members for timeline senders in case they weren't loaded in the initial
# sync. We do this by (counterintuitively) by filtering timeline_start
# members to just be ones which were timeline senders, which then ensures
# all of the rest get included in the state block (if we need to know
# about them).
state_filter = StateFilter.all()
# If this is an initial sync then full_state should be set, and
# that case is handled above. We assert here to ensure that this
# is indeed the case.
assert since_token is not None
state_at_previous_sync = await self.get_state_at(
room_id, stream_position=since_token, state_filter=state_filter
)
if batch:
current_state_ids = await self.state_store.get_state_ids_for_event(
batch.events[-1].event_id, state_filter=state_filter
)
else:
# Its not clear how we get here, but empirically we do
# (#5407). Logging has been added elsewhere to try and
# figure out where this state comes from.
current_state_ids = await self.get_state_at(
room_id, stream_position=now_token, state_filter=state_filter
)
state_ids = _calculate_state(
timeline_contains=timeline_state,
timeline_start=state_at_timeline_start,
previous=state_at_previous_sync,
current=current_state_ids,
# we have to include LL members in case LL initial sync missed them
lazy_load_members=lazy_load_members,
)
else:
state_ids = {}
if lazy_load_members:
if members_to_fetch and batch.events:
# We're returning an incremental sync, with no
# "gap" since the previous sync, so normally there would be
# no state to return.
# But we're lazy-loading, so the client might need some more
# member events to understand the events in this timeline.
# So we fish out all the member events corresponding to the
# timeline here, and then dedupe any redundant ones below.
state_ids = await self.state_store.get_state_ids_for_event(
batch.events[0].event_id,
# we only want members!
state_filter=StateFilter.from_types(
(EventTypes.Member, member)
for member in members_to_fetch
),
)