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Remove support for aggregating reactions (#15172)

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It turns out that no clients rely on server-side aggregation of `m.annotation`
relationships: it's just not very useful as currently implemented.

It's also non-trivial to calculate.

I want to remove it from MSC2677, so to keep the implementation in line, let's
remove it here.
This commit is contained in:
Richard van der Hoff 2023-02-28 18:49:28 +00:00 • committed by GitHub
parent b2fd03d075
commit 2b78981736
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8 changed files with 30 additions and 377 deletions
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76
synapse/handlers/relations.py
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@ -60,13 +60,12 @@ class BundledAggregations:
Some values require additional processing during serialization.
"""
annotations: Optional[JsonDict] = None
references: Optional[JsonDict] = None
replace: Optional[EventBase] = None
thread: Optional[_ThreadAggregation] = None
def __bool__(self) -> bool:
return bool(self.annotations or self.references or self.replace or self.thread)
return bool(self.references or self.replace or self.thread)
class RelationsHandler:
@ -227,67 +226,6 @@ class RelationsHandler:
e.msg,
)
async def get_annotations_for_events(
self, event_ids: Collection[str], ignored_users: FrozenSet[str] = frozenset()
) -> Dict[str, List[JsonDict]]:
"""Get a list of annotations to the given events, grouped by event type and
aggregation key, sorted by count.
This is used e.g. to get the what and how many reactions have happened
on an event.
Args:
event_ids: Fetch events that relate to these event IDs.
ignored_users: The users ignored by the requesting user.
Returns:
A map of event IDs to a list of groups of annotations that match.
Each entry is a dict with `type`, `key` and `count` fields.
"""
# Get the base results for all users.
full_results = await self._main_store.get_aggregation_groups_for_events(
event_ids
)
# Avoid additional logic if there are no ignored users.
if not ignored_users:
return {
event_id: results
for event_id, results in full_results.items()
if results
}
# Then subtract off the results for any ignored users.
ignored_results = await self._main_store.get_aggregation_groups_for_users(
[event_id for event_id, results in full_results.items() if results],
ignored_users,
)
filtered_results = {}
for event_id, results in full_results.items():
# If no annotations, skip.
if not results:
continue
# If there are not ignored results for this event, copy verbatim.
if event_id not in ignored_results:
filtered_results[event_id] = results
continue
# Otherwise, subtract out the ignored results.
event_ignored_results = ignored_results[event_id]
for result in results:
key = (result["type"], result["key"])
if key in event_ignored_results:
# Ensure to not modify the cache.
result = result.copy()
result["count"] -= event_ignored_results[key]
if result["count"] <= 0:
continue
filtered_results.setdefault(event_id, []).append(result)
return filtered_results
async def get_references_for_events(
self, event_ids: Collection[str], ignored_users: FrozenSet[str] = frozenset()
) -> Dict[str, List[_RelatedEvent]]:
@ -531,17 +469,6 @@ class RelationsHandler:
# (as that is what makes it part of the thread).
relations_by_id[latest_thread_event.event_id] = RelationTypes.THREAD
async def _fetch_annotations() -> None:
"""Fetch any annotations (ie, reactions) to bundle with this event."""
annotations_by_event_id = await self.get_annotations_for_events(
events_by_id.keys(), ignored_users=ignored_users
)
for event_id, annotations in annotations_by_event_id.items():
if annotations:
results.setdefault(event_id, BundledAggregations()).annotations = {
"chunk": annotations
}
async def _fetch_references() -> None:
"""Fetch any references to bundle with this event."""
references_by_event_id = await self.get_references_for_events(
@ -575,7 +502,6 @@ class RelationsHandler:
await make_deferred_yieldable(
gather_results(
(
run_in_background(_fetch_annotations),
run_in_background(_fetch_references),
run_in_background(_fetch_edits),
)