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Fetch edits for multiple events in a single query. (#11660) 

This should reduce database usage when fetching bundled aggregations
as the number of individual queries (and round trips to the database) are
reduced.
This commit is contained in:
Patrick Cloke 2022-02-08 07:43:30 -05:00 committed by GitHub
parent 380c3d40f4
commit 8b309adb43
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3 changed files with 101 additions and 54 deletions
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1
changelog.d/11660.misc Normal file
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@ -0,0 +1 @@
Improve performance when fetching bundled aggregations for multiple events.

4
synapse/storage/databases/main/events.py
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@ -1801,9 +1801,7 @@ class PersistEventsStore:
)
if rel_type == RelationTypes.REPLACE:
txn.call_after(
self.store.get_applicable_edit.invalidate, (parent_id, event.room_id)
)
txn.call_after(self.store.get_applicable_edit.invalidate, (parent_id,))
if rel_type == RelationTypes.THREAD:
txn.call_after(

130
synapse/storage/databases/main/relations.py
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@ -13,12 +13,22 @@
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union, cast
from typing import (
TYPE_CHECKING,
Collection,
Dict,
Iterable,
List,
Optional,
Tuple,
Union,
cast,
)
import attr
from frozendict import frozendict
from synapse.api.constants import EventTypes, RelationTypes
from synapse.api.constants import RelationTypes
from synapse.events import EventBase
from synapse.storage._base import SQLBaseStore
from synapse.storage.database import (
@ -28,13 +38,14 @@ from synapse.storage.database import (
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,
RelationPaginationToken,
)
from synapse.types import JsonDict
from synapse.util.caches.descriptors import cached
from synapse.util.caches.descriptors import cached, cachedList
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -340,20 +351,24 @@ class RelationsWorkerStore(SQLBaseStore):
)
@cached()
async def get_applicable_edit(
self, event_id: str, room_id: str
) -> Optional[EventBase]:
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
event.
events.
Correctly handles checking whether edits were allowed to happen.
Args:
event_id: The original event ID
room_id: The original event's room ID
event_ids: The original event IDs
Returns:
The most recent edit, if any.
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
@ -362,37 +377,67 @@ class RelationsWorkerStore(SQLBaseStore):
# 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 edit.event_id FROM events AS edit
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
relates_to_id = ?
%s
AND relation_type = ?
AND edit.room_id = ?
AND edit.type = 'm.room.message'
ORDER by edit.origin_server_ts DESC, edit.event_id DESC
LIMIT 1
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_edit_txn(txn: LoggingTransaction) -> Optional[str]:
txn.execute(sql, (event_id, RelationTypes.REPLACE, room_id))
row = txn.fetchone()
if row:
return row[0]
return None
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)
edit_id = await self.db_pool.runInteraction(
"get_applicable_edit", _get_applicable_edit_txn
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
)
if not edit_id:
return None
edits = await self.get_events(edit_ids.values()) # type: ignore[attr-defined]
return await self.get_event(edit_id, allow_none=True) # 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()
async def get_thread_summary(
@ -612,9 +657,6 @@ class RelationsWorkerStore(SQLBaseStore):
The bundled aggregations for an event, if bundled aggregations are
enabled and the event can have bundled aggregations.
"""
# State events and redacted events do not get bundled aggregations.
if event.is_state() or event.internal_metadata.is_redacted():
return None
# 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.
@ -642,13 +684,6 @@ class RelationsWorkerStore(SQLBaseStore):
if references.chunk:
aggregations.references = references.to_dict()
edit = None
if event.type == EventTypes.Message:
edit = await self.get_applicable_edit(event_id, room_id)
if edit:
aggregations.replace = edit
# If this event is the start of a thread, include a summary of the replies.
if self._msc3440_enabled:
thread_count, latest_thread_event = await self.get_thread_summary(
@ -668,9 +703,7 @@ class RelationsWorkerStore(SQLBaseStore):
return aggregations
async def get_bundled_aggregations(
self,
events: Iterable[EventBase],
user_id: str,
self, events: Iterable[EventBase], user_id: str
) -> Dict[str, BundledAggregations]:
"""Generate bundled aggregations for events.
@ -683,13 +716,28 @@ class RelationsWorkerStore(SQLBaseStore):
events may have bundled aggregations in the results.
"""
# TODO Parallelize.
results = {}
# State events and redacted events do not get bundled aggregations.
events = [
event
for event in events
if not event.is_state() and not event.internal_metadata.is_redacted()
]
# event ID -> bundled aggregation in non-serialized form.
results: Dict[str, BundledAggregations] = {}
# Fetch other relations per event.
for event in events:
event_result = await self._get_bundled_aggregation_for_event(event, user_id)
if event_result:
results[event.event_id] = event_result
# Fetch any edits.
event_ids = [event.event_id for event in events]
edits = await self._get_applicable_edits(event_ids)
for event_id, edit in edits.items():
results.setdefault(event_id, BundledAggregations()).replace = edit
return results