# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union, cast
import attr
from frozendict import frozendict
from synapse.api.constants import EventTypes, RelationTypes
from synapse.events import EventBase
from synapse.storage._base import SQLBaseStore
from synapse.storage.database import (
DatabasePool,
LoggingDatabaseConnection,
LoggingTransaction,
make_in_list_sql_clause,
)
from synapse.storage.databases.main.stream import generate_pagination_where_clause
from synapse.storage.relations import (
AggregationPaginationToken,
PaginationChunk,
RelationPaginationToken,
)
from synapse.types import JsonDict
from synapse.util.caches.descriptors import cached
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class _ThreadAggregation:
latest_event: EventBase
count: int
current_user_participated: bool
@attr.s(slots=True, auto_attribs=True)
class BundledAggregations:
"""
The bundled aggregations for an event.
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)
class RelationsWorkerStore(SQLBaseStore):
def __init__(
self,
database: DatabasePool,
db_conn: LoggingDatabaseConnection,
hs: "HomeServer",
):
super().__init__(database, db_conn, hs)
self._msc3440_enabled = hs.config.experimental.msc3440_enabled
@cached(tree=True)
async def get_relations_for_event(
self,
event_id: str,
room_id: str,
relation_type: Optional[str] = None,
event_type: Optional[str] = None,
aggregation_key: Optional[str] = None,
limit: int = 5,
direction: str = "b",
from_token: Optional[RelationPaginationToken] = None,
to_token: Optional[RelationPaginationToken] = None,
) -> PaginationChunk:
"""Get a list of relations for an event, ordered by topological ordering.
Args:
event_id: Fetch events that relate to this event ID.
room_id: The room the event belongs to.
relation_type: Only fetch events with this relation type, if given.
event_type: Only fetch events with this event type, if given.
aggregation_key: Only fetch events with this aggregation key, if given.
limit: Only fetch the most recent `limit` events.
direction: Whether to fetch the most recent first (`"b"`) or the
oldest first (`"f"`).
from_token: Fetch rows from the given token, or from the start if None.
to_token: Fetch rows up to the given token, or up to the end if None.
Returns:
List of event IDs that match relations requested. The rows are of
the form `{"event_id": "..."}`.
"""
where_clause = ["relates_to_id = ?", "room_id = ?"]
where_args: List[Union[str, int]] = [event_id, room_id]
if relation_type is not None:
where_clause.append("relation_type = ?")
where_args.append(relation_type)
if event_type is not None:
where_clause.append("type = ?")
where_args.append(event_type)
if aggregation_key:
where_clause.append("aggregation_key = ?")
where_args.append(aggregation_key)
pagination_clause = generate_pagination_where_clause(
direction=direction,
column_names=("topological_ordering", "stream_ordering"),
from_token=attr.astuple(from_token) if from_token else None, # type: ignore[arg-type]
to_token=attr.astuple(to_token) if to_token else None, # type: ignore[arg-type]
engine=self.database_engine,
)
if pagination_clause:
where_clause.append(pagination_clause)
if direction == "b":
order = "DESC"
else:
order = "ASC"
sql = """
SELECT event_id, topological_ordering, stream_ordering
FROM event_relations
INNER JOIN events USING (event_id)
WHERE %s
ORDER BY topological_ordering %s, stream_ordering %s
LIMIT ?
""" % (
" AND ".join(where_clause),
order,
order,
)
def _get_recent_references_for_event_txn(
txn: LoggingTransaction,
) -> PaginationChunk:
txn.execute(sql, where_args + [limit + 1])
last_topo_id = None
last_stream_id = None
events = []
for row in txn:
events.append({"event_id": row[0]})
last_topo_id = row[1]
last_stream_id = row[2]
next_batch = None
if len(events) > limit and last_topo_id and last_stream_id:
next_batch = RelationPaginationToken(last_topo_id, last_stream_id)
return PaginationChunk(
chunk=list(events[:limit]), next_batch=next_batch, prev_batch=from_token
)
return await self.db_pool.runInteraction(
"get_recent_references_for_event", _get_recent_references_for_event_txn
)
async def event_includes_relation(self, event_id: str) -> bool:
"""Check if the given event relates to another event.
An event has a relation if it has a valid m.relates_to with a rel_type
and event_id in the content:
{
"content": {
"m.relates_to": {
"rel_type": "m.replace",
"event_id": "$other_event_id"
}
}
}
Args:
event_id: The event to check.
Returns:
True if the event includes a valid relation.
"""
result = await self.db_pool.simple_select_one_onecol(
table="event_relations",
keyvalues={"event_id": event_id},
retcol="event_id",
allow_none=True,
desc="event_includes_relation",
)
return result is not None
async def event_is_target_of_relation(self, parent_id: str) -> bool:
"""Check if the given event is the target of another event's relation.
An event is the target of an event relation if it has a valid
m.relates_to with a rel_type and event_id pointing to parent_id in the
content:
{
"content": {
"m.relates_to": {
"rel_type": "m.replace",
"event_id": "$parent_id"
}
}
}
Args:
parent_id: The event to check.
Returns:
True if the event is the target of another event's relation.
"""
result = await self.db_pool.simple_select_one_onecol(
table="event_relations",
keyvalues={"relates_to_id": parent_id},
retcol="event_id",
allow_none=True,
desc="event_is_target_of_relation",
)
return result is not None
@cached(tree=True)
async def get_aggregation_groups_for_event(
self,
event_id: str,
room_id: str,
event_type: Optional[str] = None,
limit: int = 5,
direction: str = "b",
from_token: Optional[AggregationPaginationToken] = None,
to_token: Optional[AggregationPaginationToken] = None,
) -> PaginationChunk:
"""Get a list of annotations on the event, grouped by event type and
aggregation key, sorted by count.
This is used e.g. to get the what and how many reactions have happend
on an event.
Args:
event_id: Fetch events that relate to this event ID.
room_id: The room the event belongs to.
event_type: Only fetch events with this event type, if given.
limit: Only fetch the `limit` groups.
direction: Whether to fetch the highest count first (`"b"`) or
the lowest count first (`"f"`).
from_token: Fetch rows from the given token, or from the start if None.
to_token: Fetch rows up to the given token, or up to the end if None.
Returns:
List of groups of annotations that match. Each row is a dict with
`type`, `key` and `count` fields.
"""
where_clause = ["relates_to_id = ?", "room_id = ?", "relation_type = ?"]
where_args: List[Union[str, int]] = [
event_id,
room_id,
RelationTypes.ANNOTATION,
]
if event_type:
where_clause.append("type = ?")
where_args.append(event_type)
having_clause = generate_pagination_where_clause(
direction=direction,
column_names=("COUNT(*)", "MAX(stream_ordering)"),
from_token=attr.astuple(from_token) if from_token else None, # type: ignore[arg-type]
to_token=attr.astuple(to_token) if to_token else None, # type: ignore[arg-type]
engine=self.database_engine,
)
if direction == "b":
order = "DESC"
else:
order = "ASC"
if having_clause:
having_clause = "HAVING " + having_clause
else:
having_clause = ""
sql = """
SELECT type, aggregation_key, COUNT(DISTINCT sender), MAX(stream_ordering)
FROM event_relations
INNER JOIN events USING (event_id)
WHERE {where_clause}
GROUP BY relation_type, type, aggregation_key
{having_clause}
ORDER BY COUNT(*) {order}, MAX(stream_ordering) {order}
LIMIT ?
""".format(
where_clause=" AND ".join(where_clause),
order=order,
having_clause=having_clause,
)
def _get_aggregation_groups_for_event_txn(
txn: LoggingTransaction,
) -> PaginationChunk:
txn.execute(sql, where_args + [limit + 1])
next_batch = None
events = []
for row in txn:
events.append({"type": row[0], "key": row[1], "count": row[2]})
next_batch = AggregationPaginationToken(row[2], row[3])
if len(events) <= limit:
next_batch = None
return PaginationChunk(
chunk=list(events[:limit]), next_batch=next_batch, prev_batch=from_token
)
return await self.db_pool.runInteraction(
"get_aggregation_groups_for_event", _get_aggregation_groups_for_event_txn
)
@cached()
async def get_applicable_edit(
self, event_id: str, room_id: str
) -> Optional[EventBase]:
"""Get the most recent edit (if any) that has happened for the given
event.
Correctly handles checking whether edits were allowed to happen.
Args:
event_id: The original event ID
room_id: The original event's room ID
Returns:
The most recent edit, if any.
"""
# We only allow edits for `m.room.message` events that have the same sender
# and event type. We can't assert these things during regular event auth so
# we have to do the checks post hoc.
# Fetches latest edit that has the same type and sender as the
# original, and is an `m.room.message`.
sql = """
SELECT 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
WHERE
relates_to_id = ?
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
"""
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
edit_id = await self.db_pool.runInteraction(
"get_applicable_edit", _get_applicable_edit_txn
)
if not edit_id:
return None
return await self.get_event(edit_id, allow_none=True) # type: ignore[attr-defined]
@cached()
async def get_thread_summary(
self, event_id: str, room_id: str
) -> Tuple[int, Optional[EventBase]]:
"""Get the number of threaded replies and the latest reply (if any) for the given event.
Args:
event_id: Summarize the thread related to this event ID.
room_id: The room the event belongs to.
Returns:
The number of items in the thread and the most recent response, if any.
"""
def _get_thread_summary_txn(
txn: LoggingTransaction,
) -> Tuple[int, Optional[str]]:
# Fetch the latest event ID in the thread.
# TODO Should this only allow m.room.message events.
sql = """
SELECT event_id
FROM event_relations
INNER JOIN events USING (event_id)
WHERE
relates_to_id = ?
AND room_id = ?
AND relation_type = ?
ORDER BY topological_ordering DESC, stream_ordering DESC
LIMIT 1
"""
txn.execute(sql, (event_id, room_id, RelationTypes.THREAD))
row = txn.fetchone()
if row is None:
return 0, None
latest_event_id = row[0]
# Fetch the number of threaded replies.
sql = """
SELECT COUNT(event_id)
FROM event_relations
INNER JOIN events USING (event_id)
WHERE
relates_to_id = ?
AND room_id = ?
AND relation_type = ?
"""
txn.execute(sql, (event_id, room_id, RelationTypes.THREAD))
count = cast(Tuple[int], txn.fetchone())[0]
return count, latest_event_id
count, latest_event_id = await self.db_pool.runInteraction(
"get_thread_summary", _get_thread_summary_txn
)
latest_event = None
if latest_event_id:
latest_event = await self.get_event(latest_event_id, allow_none=True) # type: ignore[attr-defined]
return count, latest_event
@cached()
async def get_thread_participated(
self, event_id: str, room_id: str, user_id: str
) -> bool:
"""Get whether the requesting user participated in a thread.
This is separate from get_thread_summary since that can be cached across
all users while this value is specific to the requeser.
Args:
event_id: The thread related to this event ID.
room_id: The room the event belongs to.
user_id: The user requesting the summary.
Returns:
True if the requesting user participated in the thread, otherwise false.
"""
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.
"""
# 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.
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()
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(
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.
"""
# TODO Parallelize.
results = {}
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
return results
class RelationsStore(RelationsWorkerStore):
pass