diff --git a/synapse/handlers/relations.py b/synapse/handlers/relations.py
index b5dc9f74b3..cec5740fbd 100644
--- a/synapse/handlers/relations.py
+++ b/synapse/handlers/relations.py
@@ -44,8 +44,6 @@ logger = logging.getLogger(__name__)
class _ThreadAggregation:
# The latest event in the thread.
latest_event: EventBase
- # The latest edit to the latest event in the thread.
- latest_edit: Optional[EventBase]
# The total number of events in the thread.
count: int
# True if the current user has sent an event to the thread.
@@ -295,7 +293,7 @@ class RelationsHandler:
for event_id, summary in summaries.items():
if summary:
- thread_count, latest_thread_event, edit = summary
+ thread_count, latest_thread_event = summary
# Subtract off the count of any ignored users.
for ignored_user in ignored_users:
@@ -340,7 +338,6 @@ class RelationsHandler:
results[event_id] = _ThreadAggregation(
latest_event=latest_thread_event,
- latest_edit=edit,
count=thread_count,
# If there's a thread summary it must also exist in the
# participated dictionary.
@@ -359,8 +356,13 @@ class RelationsHandler:
user_id: The user requesting the bundled aggregations.
Returns:
- A map of event ID to the bundled aggregation for the event. Not all
- events may have bundled aggregations in the results.
+ A map of event ID to the bundled aggregations for the event.
+
+ Not all requested events may exist in the results (if they don't have
+ bundled aggregations).
+
+ The results may include additional events which are related to the
+ requested events.
"""
# De-duplicate events by ID to handle the same event requested multiple times.
#
@@ -369,22 +371,59 @@ class RelationsHandler:
event.event_id: event for event in events if not event.is_state()
}
+ # A map of event ID to the relation in that event, if there is one.
+ relations_by_id: Dict[str, str] = {}
+ for event_id, event in events_by_id.items():
+ relates_to = event.content.get("m.relates_to")
+ if isinstance(relates_to, collections.abc.Mapping):
+ relation_type = relates_to.get("rel_type")
+ if isinstance(relation_type, str):
+ relations_by_id[event_id] = relation_type
+
# event ID -> bundled aggregation in non-serialized form.
results: Dict[str, BundledAggregations] = {}
# Fetch any ignored users of the requesting user.
ignored_users = await self._main_store.ignored_users(user_id)
+ # Threads are special as the latest event of a thread might cause additional
+ # events to be fetched. Thus, we check those first!
+
+ # Fetch thread summaries (but only for the directly requested events).
+ threads = await self.get_threads_for_events(
+ # It is not valid to start a thread on an event which itself relates to another event.
+ [eid for eid in events_by_id.keys() if eid not in relations_by_id],
+ user_id,
+ ignored_users,
+ )
+ for event_id, thread in threads.items():
+ results.setdefault(event_id, BundledAggregations()).thread = thread
+
+ # If the latest event in a thread is not already being fetched,
+ # add it. This ensures that the bundled aggregations for the
+ # latest thread event is correct.
+ latest_thread_event = thread.latest_event
+ if latest_thread_event and latest_thread_event.event_id not in events_by_id:
+ events_by_id[latest_thread_event.event_id] = latest_thread_event
+ # Keep relations_by_id in sync with events_by_id:
+ #
+ # We know that the latest event in a thread has a thread relation
+ # (as that is what makes it part of the thread).
+ relations_by_id[latest_thread_event.event_id] = RelationTypes.THREAD
+
# Fetch other relations per event.
for event in events_by_id.values():
- # Do not bundle aggregations for an event which represents an edit or an
- # annotation. It does not make sense for them to have related events.
- relates_to = event.content.get("m.relates_to")
- if isinstance(relates_to, collections.abc.Mapping):
- relation_type = relates_to.get("rel_type")
- if relation_type in (RelationTypes.ANNOTATION, RelationTypes.REPLACE):
- continue
-
+ # An event which is a replacement (ie edit) or annotation (ie, reaction)
+ # may not have any other event related to it.
+ #
+ # XXX This is buggy, see https://github.com/matrix-org/synapse/issues/12566
+ if relations_by_id.get(event.event_id) in (
+ RelationTypes.ANNOTATION,
+ RelationTypes.REPLACE,
+ ):
+ continue
+
+ # Fetch any annotations (ie, reactions) to bundle with this event.
annotations = await self.get_annotations_for_event(
event.event_id, event.room_id, ignored_users=ignored_users
)
@@ -393,6 +432,7 @@ class RelationsHandler:
event.event_id, BundledAggregations()
).annotations = {"chunk": annotations}
+ # Fetch any references to bundle with this event.
references, next_token = await self.get_relations_for_event(
event.event_id,
event,
@@ -425,10 +465,4 @@ class RelationsHandler:
for event_id, edit in edits.items():
results.setdefault(event_id, BundledAggregations()).replace = edit
- threads = await self.get_threads_for_events(
- events_by_id.keys(), user_id, ignored_users
- )
- for event_id, thread in threads.items():
- results.setdefault(event_id, BundledAggregations()).thread = thread
-
return results
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