321 lines
11 KiB
Python
321 lines
11 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 Optional
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import attr
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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.databases.main.stream import generate_pagination_where_clause
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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.util.caches.descriptors import cached
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logger = logging.getLogger(__name__)
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class RelationsWorkerStore(SQLBaseStore):
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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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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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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 = ?"]
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where_args = [event_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,
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to_token=attr.astuple(to_token) if to_token else None,
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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(txn):
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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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@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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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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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 = ?", "relation_type = ?"]
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where_args = [event_id, RelationTypes.ANNOTATION]
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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,
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to_token=attr.astuple(to_token) if to_token else None,
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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(txn):
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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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async def get_applicable_edit(self, event_id: str) -> Optional[EventBase]:
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"""Get the most recent edit (if any) that has happened for the given
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event.
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Correctly handles checking whether edits were allowed to happen.
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Args:
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event_id: The original event ID
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Returns:
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The most recent edit, if any.
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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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sql = """
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SELECT 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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WHERE
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relates_to_id = ?
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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 DESC, edit.event_id DESC
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LIMIT 1
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"""
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def _get_applicable_edit_txn(txn):
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txn.execute(sql, (event_id, RelationTypes.REPLACE))
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row = txn.fetchone()
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if row:
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return row[0]
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edit_id = await self.db_pool.runInteraction(
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"get_applicable_edit", _get_applicable_edit_txn
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)
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if not edit_id:
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return None
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return await self.get_event(edit_id, allow_none=True)
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async def has_user_annotated_event(
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self, parent_id: str, event_type: str, aggregation_key: str, sender: str
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) -> bool:
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"""Check if a user has already annotated an event with the same key
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(e.g. already liked an event).
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Args:
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parent_id: The event being annotated
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event_type: The event type of the annotation
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aggregation_key: The aggregation key of the annotation
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sender: The sender of the annotation
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Returns:
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True if the event is already annotated.
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"""
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sql = """
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SELECT 1 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 relation_type = ?
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AND type = ?
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AND sender = ?
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AND aggregation_key = ?
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LIMIT 1;
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"""
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def _get_if_user_has_annotated_event(txn):
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txn.execute(
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sql,
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(
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parent_id,
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RelationTypes.ANNOTATION,
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event_type,
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sender,
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aggregation_key,
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),
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)
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return bool(txn.fetchone())
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return await self.db_pool.runInteraction(
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"get_if_user_has_annotated_event", _get_if_user_has_annotated_event
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)
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class RelationsStore(RelationsWorkerStore):
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pass
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