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![Patrick Cloke](/assets/img/avatar_default.png)
This should reduce database usage when fetching bundled aggregations as the number of individual queries (and round trips to the database) are reduced.
746 lines
26 KiB
Python
746 lines
26 KiB
Python
# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import (
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TYPE_CHECKING,
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Collection,
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Dict,
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Iterable,
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List,
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Optional,
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Tuple,
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Union,
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cast,
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)
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import attr
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from frozendict import frozendict
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from synapse.api.constants import RelationTypes
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from synapse.events import EventBase
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import (
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DatabasePool,
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LoggingDatabaseConnection,
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LoggingTransaction,
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make_in_list_sql_clause,
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)
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from synapse.storage.databases.main.stream import generate_pagination_where_clause
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from synapse.storage.engines import PostgresEngine
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from synapse.storage.relations import (
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AggregationPaginationToken,
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PaginationChunk,
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RelationPaginationToken,
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)
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from synapse.types import JsonDict
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from synapse.util.caches.descriptors import cached, cachedList
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class _ThreadAggregation:
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latest_event: EventBase
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count: int
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current_user_participated: bool
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@attr.s(slots=True, auto_attribs=True)
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class BundledAggregations:
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"""
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The bundled aggregations for an event.
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Some values require additional processing during serialization.
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"""
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annotations: Optional[JsonDict] = None
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references: Optional[JsonDict] = None
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replace: Optional[EventBase] = None
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thread: Optional[_ThreadAggregation] = None
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def __bool__(self) -> bool:
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return bool(self.annotations or self.references or self.replace or self.thread)
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class RelationsWorkerStore(SQLBaseStore):
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def __init__(
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self,
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database: DatabasePool,
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db_conn: LoggingDatabaseConnection,
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hs: "HomeServer",
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):
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super().__init__(database, db_conn, hs)
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self._msc3440_enabled = hs.config.experimental.msc3440_enabled
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@cached(tree=True)
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async def get_relations_for_event(
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self,
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event_id: str,
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room_id: str,
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relation_type: Optional[str] = None,
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event_type: Optional[str] = None,
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aggregation_key: Optional[str] = None,
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limit: int = 5,
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direction: str = "b",
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from_token: Optional[RelationPaginationToken] = None,
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to_token: Optional[RelationPaginationToken] = None,
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) -> PaginationChunk:
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"""Get a list of relations for an event, ordered by topological ordering.
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Args:
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event_id: Fetch events that relate to this event ID.
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room_id: The room the event belongs to.
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relation_type: Only fetch events with this relation type, if given.
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event_type: Only fetch events with this event type, if given.
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aggregation_key: Only fetch events with this aggregation key, if given.
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limit: Only fetch the most recent `limit` events.
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direction: Whether to fetch the most recent first (`"b"`) or the
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oldest first (`"f"`).
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from_token: Fetch rows from the given token, or from the start if None.
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to_token: Fetch rows up to the given token, or up to the end if None.
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Returns:
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List of event IDs that match relations requested. The rows are of
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the form `{"event_id": "..."}`.
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"""
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where_clause = ["relates_to_id = ?", "room_id = ?"]
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where_args: List[Union[str, int]] = [event_id, room_id]
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if relation_type is not None:
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where_clause.append("relation_type = ?")
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where_args.append(relation_type)
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if event_type is not None:
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where_clause.append("type = ?")
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where_args.append(event_type)
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if aggregation_key:
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where_clause.append("aggregation_key = ?")
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where_args.append(aggregation_key)
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pagination_clause = generate_pagination_where_clause(
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direction=direction,
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column_names=("topological_ordering", "stream_ordering"),
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from_token=attr.astuple(from_token) if from_token else None, # type: ignore[arg-type]
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to_token=attr.astuple(to_token) if to_token else None, # type: ignore[arg-type]
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engine=self.database_engine,
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)
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if pagination_clause:
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where_clause.append(pagination_clause)
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if direction == "b":
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order = "DESC"
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else:
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order = "ASC"
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sql = """
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SELECT event_id, topological_ordering, stream_ordering
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FROM event_relations
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INNER JOIN events USING (event_id)
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WHERE %s
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ORDER BY topological_ordering %s, stream_ordering %s
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LIMIT ?
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""" % (
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" AND ".join(where_clause),
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order,
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order,
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)
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def _get_recent_references_for_event_txn(
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txn: LoggingTransaction,
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) -> PaginationChunk:
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txn.execute(sql, where_args + [limit + 1])
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last_topo_id = None
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last_stream_id = None
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events = []
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for row in txn:
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events.append({"event_id": row[0]})
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last_topo_id = row[1]
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last_stream_id = row[2]
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next_batch = None
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if len(events) > limit and last_topo_id and last_stream_id:
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next_batch = RelationPaginationToken(last_topo_id, last_stream_id)
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return PaginationChunk(
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chunk=list(events[:limit]), next_batch=next_batch, prev_batch=from_token
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)
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return await self.db_pool.runInteraction(
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"get_recent_references_for_event", _get_recent_references_for_event_txn
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)
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async def event_includes_relation(self, event_id: str) -> bool:
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"""Check if the given event relates to another event.
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An event has a relation if it has a valid m.relates_to with a rel_type
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and event_id in the content:
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{
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"content": {
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"m.relates_to": {
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"rel_type": "m.replace",
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"event_id": "$other_event_id"
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}
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}
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}
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Args:
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event_id: The event to check.
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Returns:
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True if the event includes a valid relation.
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"""
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result = await self.db_pool.simple_select_one_onecol(
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table="event_relations",
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keyvalues={"event_id": event_id},
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retcol="event_id",
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allow_none=True,
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desc="event_includes_relation",
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)
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return result is not None
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async def event_is_target_of_relation(self, parent_id: str) -> bool:
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"""Check if the given event is the target of another event's relation.
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An event is the target of an event relation if it has a valid
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m.relates_to with a rel_type and event_id pointing to parent_id in the
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content:
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{
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"content": {
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"m.relates_to": {
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"rel_type": "m.replace",
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"event_id": "$parent_id"
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}
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}
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}
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Args:
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parent_id: The event to check.
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Returns:
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True if the event is the target of another event's relation.
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"""
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result = await self.db_pool.simple_select_one_onecol(
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table="event_relations",
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keyvalues={"relates_to_id": parent_id},
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retcol="event_id",
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allow_none=True,
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desc="event_is_target_of_relation",
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)
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return result is not None
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@cached(tree=True)
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async def get_aggregation_groups_for_event(
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self,
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event_id: str,
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room_id: str,
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event_type: Optional[str] = None,
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limit: int = 5,
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direction: str = "b",
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from_token: Optional[AggregationPaginationToken] = None,
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to_token: Optional[AggregationPaginationToken] = None,
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) -> PaginationChunk:
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"""Get a list of annotations on the event, grouped by event type and
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aggregation key, sorted by count.
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This is used e.g. to get the what and how many reactions have happend
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on an event.
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Args:
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event_id: Fetch events that relate to this event ID.
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room_id: The room the event belongs to.
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event_type: Only fetch events with this event type, if given.
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limit: Only fetch the `limit` groups.
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direction: Whether to fetch the highest count first (`"b"`) or
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the lowest count first (`"f"`).
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from_token: Fetch rows from the given token, or from the start if None.
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to_token: Fetch rows up to the given token, or up to the end if None.
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Returns:
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List of groups of annotations that match. Each row is a dict with
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`type`, `key` and `count` fields.
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"""
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where_clause = ["relates_to_id = ?", "room_id = ?", "relation_type = ?"]
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where_args: List[Union[str, int]] = [
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event_id,
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room_id,
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RelationTypes.ANNOTATION,
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]
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if event_type:
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where_clause.append("type = ?")
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where_args.append(event_type)
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having_clause = generate_pagination_where_clause(
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direction=direction,
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column_names=("COUNT(*)", "MAX(stream_ordering)"),
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from_token=attr.astuple(from_token) if from_token else None, # type: ignore[arg-type]
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to_token=attr.astuple(to_token) if to_token else None, # type: ignore[arg-type]
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engine=self.database_engine,
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)
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if direction == "b":
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order = "DESC"
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else:
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order = "ASC"
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if having_clause:
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having_clause = "HAVING " + having_clause
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else:
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having_clause = ""
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sql = """
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SELECT type, aggregation_key, COUNT(DISTINCT sender), MAX(stream_ordering)
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FROM event_relations
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INNER JOIN events USING (event_id)
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WHERE {where_clause}
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GROUP BY relation_type, type, aggregation_key
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{having_clause}
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ORDER BY COUNT(*) {order}, MAX(stream_ordering) {order}
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LIMIT ?
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""".format(
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where_clause=" AND ".join(where_clause),
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order=order,
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having_clause=having_clause,
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)
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def _get_aggregation_groups_for_event_txn(
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txn: LoggingTransaction,
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) -> PaginationChunk:
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txn.execute(sql, where_args + [limit + 1])
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next_batch = None
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events = []
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for row in txn:
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events.append({"type": row[0], "key": row[1], "count": row[2]})
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next_batch = AggregationPaginationToken(row[2], row[3])
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if len(events) <= limit:
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next_batch = None
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return PaginationChunk(
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chunk=list(events[:limit]), next_batch=next_batch, prev_batch=from_token
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)
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return await self.db_pool.runInteraction(
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"get_aggregation_groups_for_event", _get_aggregation_groups_for_event_txn
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)
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@cached()
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def get_applicable_edit(self, event_id: str) -> Optional[EventBase]:
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raise NotImplementedError()
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@cachedList(cached_method_name="get_applicable_edit", list_name="event_ids")
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async def _get_applicable_edits(
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self, event_ids: Collection[str]
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) -> Dict[str, Optional[EventBase]]:
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"""Get the most recent edit (if any) that has happened for the given
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events.
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Correctly handles checking whether edits were allowed to happen.
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Args:
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event_ids: The original event IDs
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Returns:
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A map of the most recent edit for each event. If there are no edits,
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the event will map to None.
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"""
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# We only allow edits for `m.room.message` events that have the same sender
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# and event type. We can't assert these things during regular event auth so
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# we have to do the checks post hoc.
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# Fetches latest edit that has the same type and sender as the
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# original, and is an `m.room.message`.
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if isinstance(self.database_engine, PostgresEngine):
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# The `DISTINCT ON` clause will pick the *first* row it encounters,
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# so ordering by origin server ts + event ID desc will ensure we get
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# the latest edit.
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sql = """
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SELECT DISTINCT ON (original.event_id) original.event_id, edit.event_id FROM events AS edit
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INNER JOIN event_relations USING (event_id)
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INNER JOIN events AS original ON
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original.event_id = relates_to_id
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AND edit.type = original.type
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AND edit.sender = original.sender
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AND edit.room_id = original.room_id
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WHERE
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%s
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AND relation_type = ?
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AND edit.type = 'm.room.message'
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ORDER by original.event_id DESC, edit.origin_server_ts DESC, edit.event_id DESC
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"""
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else:
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# SQLite uses a simplified query which returns all edits for an
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# original event. The results are then de-duplicated when turned into
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# a dict. Due to the chosen ordering, the latest edit stomps on
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# earlier edits.
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sql = """
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SELECT original.event_id, edit.event_id FROM events AS edit
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INNER JOIN event_relations USING (event_id)
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INNER JOIN events AS original ON
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original.event_id = relates_to_id
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AND edit.type = original.type
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AND edit.sender = original.sender
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AND edit.room_id = original.room_id
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WHERE
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%s
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AND relation_type = ?
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AND edit.type = 'm.room.message'
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ORDER by edit.origin_server_ts, edit.event_id
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"""
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def _get_applicable_edits_txn(txn: LoggingTransaction) -> Dict[str, str]:
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clause, args = make_in_list_sql_clause(
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txn.database_engine, "relates_to_id", event_ids
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)
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args.append(RelationTypes.REPLACE)
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txn.execute(sql % (clause,), args)
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return dict(cast(Iterable[Tuple[str, str]], txn.fetchall()))
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edit_ids = await self.db_pool.runInteraction(
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"get_applicable_edits", _get_applicable_edits_txn
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)
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edits = await self.get_events(edit_ids.values()) # type: ignore[attr-defined]
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# Map to the original event IDs to the edit events.
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#
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# There might not be an edit event due to there being no edits or
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# due to the event not being known, either case is treated the same.
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return {
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original_event_id: edits.get(edit_ids.get(original_event_id))
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for original_event_id in event_ids
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}
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@cached()
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async def get_thread_summary(
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self, event_id: str, room_id: str
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) -> Tuple[int, Optional[EventBase]]:
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"""Get the number of threaded replies and the latest reply (if any) for the given event.
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Args:
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event_id: Summarize the thread related to this event ID.
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room_id: The room the event belongs to.
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Returns:
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The number of items in the thread and the most recent response, if any.
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"""
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def _get_thread_summary_txn(
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txn: LoggingTransaction,
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) -> Tuple[int, Optional[str]]:
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# Fetch the latest event ID in the thread.
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# TODO Should this only allow m.room.message events.
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sql = """
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SELECT event_id
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FROM event_relations
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INNER JOIN events USING (event_id)
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WHERE
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relates_to_id = ?
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AND room_id = ?
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AND relation_type = ?
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ORDER BY topological_ordering DESC, stream_ordering DESC
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LIMIT 1
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"""
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txn.execute(sql, (event_id, room_id, RelationTypes.THREAD))
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row = txn.fetchone()
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if row is None:
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return 0, None
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latest_event_id = row[0]
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# Fetch the number of threaded replies.
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sql = """
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SELECT COUNT(event_id)
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FROM event_relations
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INNER JOIN events USING (event_id)
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WHERE
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relates_to_id = ?
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AND room_id = ?
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AND relation_type = ?
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"""
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txn.execute(sql, (event_id, room_id, RelationTypes.THREAD))
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count = cast(Tuple[int], txn.fetchone())[0]
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return count, latest_event_id
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count, latest_event_id = await self.db_pool.runInteraction(
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"get_thread_summary", _get_thread_summary_txn
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)
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latest_event = None
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if latest_event_id:
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latest_event = await self.get_event(latest_event_id, allow_none=True) # type: ignore[attr-defined]
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return count, latest_event
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@cached()
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async def get_thread_participated(
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self, event_id: str, room_id: str, user_id: str
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) -> bool:
|
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"""Get whether the requesting user participated in a thread.
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This is separate from get_thread_summary since that can be cached across
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all users while this value is specific to the requeser.
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Args:
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event_id: The thread related to this event ID.
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room_id: The room the event belongs to.
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user_id: The user requesting the summary.
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Returns:
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True if the requesting user participated in the thread, otherwise false.
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"""
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|
|
def _get_thread_summary_txn(txn: LoggingTransaction) -> bool:
|
|
# Fetch whether the requester has participated or not.
|
|
sql = """
|
|
SELECT 1
|
|
FROM event_relations
|
|
INNER JOIN events USING (event_id)
|
|
WHERE
|
|
relates_to_id = ?
|
|
AND room_id = ?
|
|
AND relation_type = ?
|
|
AND sender = ?
|
|
"""
|
|
|
|
txn.execute(sql, (event_id, room_id, RelationTypes.THREAD, user_id))
|
|
return bool(txn.fetchone())
|
|
|
|
return await self.db_pool.runInteraction(
|
|
"get_thread_summary", _get_thread_summary_txn
|
|
)
|
|
|
|
async def events_have_relations(
|
|
self,
|
|
parent_ids: List[str],
|
|
relation_senders: Optional[List[str]],
|
|
relation_types: Optional[List[str]],
|
|
) -> List[str]:
|
|
"""Check which events have a relationship from the given senders of the
|
|
given types.
|
|
|
|
Args:
|
|
parent_ids: The events being annotated
|
|
relation_senders: The relation senders to check.
|
|
relation_types: The relation types to check.
|
|
|
|
Returns:
|
|
True if the event has at least one relationship from one of the given senders of the given type.
|
|
"""
|
|
# If no restrictions are given then the event has the required relations.
|
|
if not relation_senders and not relation_types:
|
|
return parent_ids
|
|
|
|
sql = """
|
|
SELECT relates_to_id FROM event_relations
|
|
INNER JOIN events USING (event_id)
|
|
WHERE
|
|
%s;
|
|
"""
|
|
|
|
def _get_if_events_have_relations(txn) -> List[str]:
|
|
clauses: List[str] = []
|
|
clause, args = make_in_list_sql_clause(
|
|
txn.database_engine, "relates_to_id", parent_ids
|
|
)
|
|
clauses.append(clause)
|
|
|
|
if relation_senders:
|
|
clause, temp_args = make_in_list_sql_clause(
|
|
txn.database_engine, "sender", relation_senders
|
|
)
|
|
clauses.append(clause)
|
|
args.extend(temp_args)
|
|
if relation_types:
|
|
clause, temp_args = make_in_list_sql_clause(
|
|
txn.database_engine, "relation_type", relation_types
|
|
)
|
|
clauses.append(clause)
|
|
args.extend(temp_args)
|
|
|
|
txn.execute(sql % " AND ".join(clauses), args)
|
|
|
|
return [row[0] for row in txn]
|
|
|
|
return await self.db_pool.runInteraction(
|
|
"get_if_events_have_relations", _get_if_events_have_relations
|
|
)
|
|
|
|
async def has_user_annotated_event(
|
|
self, parent_id: str, event_type: str, aggregation_key: str, sender: str
|
|
) -> bool:
|
|
"""Check if a user has already annotated an event with the same key
|
|
(e.g. already liked an event).
|
|
|
|
Args:
|
|
parent_id: The event being annotated
|
|
event_type: The event type of the annotation
|
|
aggregation_key: The aggregation key of the annotation
|
|
sender: The sender of the annotation
|
|
|
|
Returns:
|
|
True if the event is already annotated.
|
|
"""
|
|
|
|
sql = """
|
|
SELECT 1 FROM event_relations
|
|
INNER JOIN events USING (event_id)
|
|
WHERE
|
|
relates_to_id = ?
|
|
AND relation_type = ?
|
|
AND type = ?
|
|
AND sender = ?
|
|
AND aggregation_key = ?
|
|
LIMIT 1;
|
|
"""
|
|
|
|
def _get_if_user_has_annotated_event(txn: LoggingTransaction) -> bool:
|
|
txn.execute(
|
|
sql,
|
|
(
|
|
parent_id,
|
|
RelationTypes.ANNOTATION,
|
|
event_type,
|
|
sender,
|
|
aggregation_key,
|
|
),
|
|
)
|
|
|
|
return bool(txn.fetchone())
|
|
|
|
return await self.db_pool.runInteraction(
|
|
"get_if_user_has_annotated_event", _get_if_user_has_annotated_event
|
|
)
|
|
|
|
async def _get_bundled_aggregation_for_event(
|
|
self, event: EventBase, user_id: str
|
|
) -> Optional[BundledAggregations]:
|
|
"""Generate bundled aggregations for an event.
|
|
|
|
Note that this does not use a cache, but depends on cached methods.
|
|
|
|
Args:
|
|
event: The event to calculate bundled aggregations for.
|
|
user_id: The user requesting the bundled aggregations.
|
|
|
|
Returns:
|
|
The bundled aggregations for an event, if bundled aggregations are
|
|
enabled and the event can have bundled aggregations.
|
|
"""
|
|
|
|
# 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, (dict, frozendict)):
|
|
relation_type = relates_to.get("rel_type")
|
|
if relation_type in (RelationTypes.ANNOTATION, RelationTypes.REPLACE):
|
|
return None
|
|
|
|
event_id = event.event_id
|
|
room_id = event.room_id
|
|
|
|
# The bundled aggregations to include, a mapping of relation type to a
|
|
# type-specific value. Some types include the direct return type here
|
|
# while others need more processing during serialization.
|
|
aggregations = BundledAggregations()
|
|
|
|
annotations = await self.get_aggregation_groups_for_event(event_id, room_id)
|
|
if annotations.chunk:
|
|
aggregations.annotations = annotations.to_dict()
|
|
|
|
references = await self.get_relations_for_event(
|
|
event_id, room_id, RelationTypes.REFERENCE, direction="f"
|
|
)
|
|
if references.chunk:
|
|
aggregations.references = references.to_dict()
|
|
|
|
# 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(
|
|
event_id, room_id
|
|
)
|
|
participated = await self.get_thread_participated(
|
|
event_id, room_id, user_id
|
|
)
|
|
if latest_thread_event:
|
|
aggregations.thread = _ThreadAggregation(
|
|
latest_event=latest_thread_event,
|
|
count=thread_count,
|
|
current_user_participated=participated,
|
|
)
|
|
|
|
# Store the bundled aggregations in the event metadata for later use.
|
|
return aggregations
|
|
|
|
async def get_bundled_aggregations(
|
|
self, events: Iterable[EventBase], user_id: str
|
|
) -> Dict[str, BundledAggregations]:
|
|
"""Generate bundled aggregations for events.
|
|
|
|
Args:
|
|
events: The iterable of events to calculate bundled aggregations for.
|
|
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.
|
|
"""
|
|
|
|
# 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
|
|
|
|
|
|
class RelationsStore(RelationsWorkerStore):
|
|
pass
|