mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-30 02:36:11 -05:00
126a15794c
The callers either set a default limit or manually handle a None-limit later on (by setting a default value). Update the callers to always instantiate PaginationConfig with a default limit and then assume the limit is non-None.
566 lines
22 KiB
Python
566 lines
22 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# 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 enum
|
|
import logging
|
|
from typing import TYPE_CHECKING, Dict, FrozenSet, Iterable, List, Optional, Tuple
|
|
|
|
import attr
|
|
|
|
from synapse.api.constants import RelationTypes
|
|
from synapse.api.errors import SynapseError
|
|
from synapse.events import EventBase, relation_from_event
|
|
from synapse.logging.opentracing import trace
|
|
from synapse.storage.databases.main.relations import ThreadsNextBatch, _RelatedEvent
|
|
from synapse.streams.config import PaginationConfig
|
|
from synapse.types import JsonDict, Requester, StreamToken, UserID
|
|
from synapse.visibility import filter_events_for_client
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ThreadsListInclude(str, enum.Enum):
|
|
"""Valid values for the 'include' flag of /threads."""
|
|
|
|
all = "all"
|
|
participated = "participated"
|
|
|
|
|
|
@attr.s(slots=True, frozen=True, auto_attribs=True)
|
|
class _ThreadAggregation:
|
|
# The latest event in the thread.
|
|
latest_event: EventBase
|
|
# The total number of events in the thread.
|
|
count: int
|
|
# True if the current user has sent an event to the thread.
|
|
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 RelationsHandler:
|
|
def __init__(self, hs: "HomeServer"):
|
|
self._main_store = hs.get_datastores().main
|
|
self._storage_controllers = hs.get_storage_controllers()
|
|
self._auth = hs.get_auth()
|
|
self._clock = hs.get_clock()
|
|
self._event_handler = hs.get_event_handler()
|
|
self._event_serializer = hs.get_event_client_serializer()
|
|
|
|
async def get_relations(
|
|
self,
|
|
requester: Requester,
|
|
event_id: str,
|
|
room_id: str,
|
|
pagin_config: PaginationConfig,
|
|
include_original_event: bool,
|
|
relation_type: Optional[str] = None,
|
|
event_type: Optional[str] = None,
|
|
) -> JsonDict:
|
|
"""Get related events of a event, ordered by topological ordering.
|
|
|
|
TODO Accept a PaginationConfig instead of individual pagination parameters.
|
|
|
|
Args:
|
|
requester: The user requesting the relations.
|
|
event_id: Fetch events that relate to this event ID.
|
|
room_id: The room the event belongs to.
|
|
pagin_config: The pagination config rules to apply, if any.
|
|
include_original_event: Whether to include the parent event.
|
|
relation_type: Only fetch events with this relation type, if given.
|
|
event_type: Only fetch events with this event type, if given.
|
|
|
|
Returns:
|
|
The pagination chunk.
|
|
"""
|
|
|
|
user_id = requester.user.to_string()
|
|
|
|
# TODO Properly handle a user leaving a room.
|
|
(_, member_event_id) = await self._auth.check_user_in_room_or_world_readable(
|
|
room_id, requester, allow_departed_users=True
|
|
)
|
|
|
|
# This gets the original event and checks that a) the event exists and
|
|
# b) the user is allowed to view it.
|
|
event = await self._event_handler.get_event(requester.user, room_id, event_id)
|
|
if event is None:
|
|
raise SynapseError(404, "Unknown parent event.")
|
|
|
|
# Note that ignored users are not passed into get_relations_for_event
|
|
# below. Ignored users are handled in filter_events_for_client (and by
|
|
# not passing them in here we should get a better cache hit rate).
|
|
related_events, next_token = await self._main_store.get_relations_for_event(
|
|
event_id=event_id,
|
|
event=event,
|
|
room_id=room_id,
|
|
relation_type=relation_type,
|
|
event_type=event_type,
|
|
limit=pagin_config.limit,
|
|
direction=pagin_config.direction,
|
|
from_token=pagin_config.from_token,
|
|
to_token=pagin_config.to_token,
|
|
)
|
|
|
|
events = await self._main_store.get_events_as_list(
|
|
[e.event_id for e in related_events]
|
|
)
|
|
|
|
events = await filter_events_for_client(
|
|
self._storage_controllers,
|
|
user_id,
|
|
events,
|
|
is_peeking=(member_event_id is None),
|
|
)
|
|
|
|
# The relations returned for the requested event do include their
|
|
# bundled aggregations.
|
|
aggregations = await self.get_bundled_aggregations(
|
|
events, requester.user.to_string()
|
|
)
|
|
|
|
now = self._clock.time_msec()
|
|
return_value: JsonDict = {
|
|
"chunk": self._event_serializer.serialize_events(
|
|
events, now, bundle_aggregations=aggregations
|
|
),
|
|
}
|
|
if include_original_event:
|
|
# Do not bundle aggregations when retrieving the original event because
|
|
# we want the content before relations are applied to it.
|
|
return_value["original_event"] = self._event_serializer.serialize_event(
|
|
event, now, bundle_aggregations=None
|
|
)
|
|
|
|
if next_token:
|
|
return_value["next_batch"] = await next_token.to_string(self._main_store)
|
|
|
|
if pagin_config.from_token:
|
|
return_value["prev_batch"] = await pagin_config.from_token.to_string(
|
|
self._main_store
|
|
)
|
|
|
|
return return_value
|
|
|
|
async def get_relations_for_event(
|
|
self,
|
|
event_id: str,
|
|
event: EventBase,
|
|
room_id: str,
|
|
relation_type: str,
|
|
ignored_users: FrozenSet[str] = frozenset(),
|
|
) -> Tuple[List[_RelatedEvent], Optional[StreamToken]]:
|
|
"""Get a list of events which relate to an event, ordered by topological ordering.
|
|
|
|
Args:
|
|
event_id: Fetch events that relate to this event ID.
|
|
event: The matching EventBase to event_id.
|
|
room_id: The room the event belongs to.
|
|
relation_type: The type of relation.
|
|
ignored_users: The users ignored by the requesting user.
|
|
|
|
Returns:
|
|
List of event IDs that match relations requested. The rows are of
|
|
the form `{"event_id": "..."}`.
|
|
"""
|
|
|
|
# Call the underlying storage method, which is cached.
|
|
related_events, next_token = await self._main_store.get_relations_for_event(
|
|
event_id, event, room_id, relation_type, direction="f"
|
|
)
|
|
|
|
# Filter out ignored users and convert to the expected format.
|
|
related_events = [
|
|
event for event in related_events if event.sender not in ignored_users
|
|
]
|
|
|
|
return related_events, next_token
|
|
|
|
async def get_annotations_for_event(
|
|
self,
|
|
event_id: str,
|
|
room_id: str,
|
|
limit: int = 5,
|
|
ignored_users: FrozenSet[str] = frozenset(),
|
|
) -> List[JsonDict]:
|
|
"""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.
|
|
limit: Only fetch the `limit` groups.
|
|
ignored_users: The users ignored by the requesting user.
|
|
|
|
Returns:
|
|
List of groups of annotations that match. Each row is a dict with
|
|
`type`, `key` and `count` fields.
|
|
"""
|
|
# Get the base results for all users.
|
|
full_results = await self._main_store.get_aggregation_groups_for_event(
|
|
event_id, room_id, limit
|
|
)
|
|
|
|
# Then subtract off the results for any ignored users.
|
|
ignored_results = await self._main_store.get_aggregation_groups_for_users(
|
|
event_id, room_id, limit, ignored_users
|
|
)
|
|
|
|
filtered_results = []
|
|
for result in full_results:
|
|
key = (result["type"], result["key"])
|
|
if key in ignored_results:
|
|
result = result.copy()
|
|
result["count"] -= ignored_results[key]
|
|
if result["count"] <= 0:
|
|
continue
|
|
filtered_results.append(result)
|
|
|
|
return filtered_results
|
|
|
|
async def _get_threads_for_events(
|
|
self,
|
|
events_by_id: Dict[str, EventBase],
|
|
relations_by_id: Dict[str, str],
|
|
user_id: str,
|
|
ignored_users: FrozenSet[str],
|
|
) -> Dict[str, _ThreadAggregation]:
|
|
"""Get the bundled aggregations for threads for the requested events.
|
|
|
|
Args:
|
|
events_by_id: A map of event_id to events to get aggregations for threads.
|
|
relations_by_id: A map of event_id to the relation type, if one exists
|
|
for that event.
|
|
user_id: The user requesting the bundled aggregations.
|
|
ignored_users: The users ignored by the requesting user.
|
|
|
|
Returns:
|
|
A dictionary mapping event ID to the thread information.
|
|
|
|
May not contain a value for all requested event IDs.
|
|
"""
|
|
user = UserID.from_string(user_id)
|
|
|
|
# It is not valid to start a thread on an event which itself relates to another event.
|
|
event_ids = [eid for eid in events_by_id.keys() if eid not in relations_by_id]
|
|
|
|
# Fetch thread summaries.
|
|
summaries = await self._main_store.get_thread_summaries(event_ids)
|
|
|
|
# Limit fetching whether the requester has participated in a thread to
|
|
# events which are thread roots.
|
|
thread_event_ids = [
|
|
event_id for event_id, summary in summaries.items() if summary
|
|
]
|
|
|
|
# Pre-seed thread participation with whether the requester sent the event.
|
|
participated = {
|
|
event_id: events_by_id[event_id].sender == user_id
|
|
for event_id in thread_event_ids
|
|
}
|
|
# For events the requester did not send, check the database for whether
|
|
# the requester sent a threaded reply.
|
|
participated.update(
|
|
await self._main_store.get_threads_participated(
|
|
[
|
|
event_id
|
|
for event_id in thread_event_ids
|
|
if not participated[event_id]
|
|
],
|
|
user_id,
|
|
)
|
|
)
|
|
|
|
# Then subtract off the results for any ignored users.
|
|
ignored_results = await self._main_store.get_threaded_messages_per_user(
|
|
thread_event_ids, ignored_users
|
|
)
|
|
|
|
# A map of event ID to the thread aggregation.
|
|
results = {}
|
|
|
|
for event_id, summary in summaries.items():
|
|
if summary:
|
|
thread_count, latest_thread_event = summary
|
|
|
|
# Subtract off the count of any ignored users.
|
|
for ignored_user in ignored_users:
|
|
thread_count -= ignored_results.get((event_id, ignored_user), 0)
|
|
|
|
# This is gnarly, but if the latest event is from an ignored user,
|
|
# attempt to find one that isn't from an ignored user.
|
|
if latest_thread_event.sender in ignored_users:
|
|
room_id = latest_thread_event.room_id
|
|
|
|
# If the root event is not found, something went wrong, do
|
|
# not include a summary of the thread.
|
|
event = await self._event_handler.get_event(user, room_id, event_id)
|
|
if event is None:
|
|
continue
|
|
|
|
potential_events, _ = await self.get_relations_for_event(
|
|
event_id,
|
|
event,
|
|
room_id,
|
|
RelationTypes.THREAD,
|
|
ignored_users,
|
|
)
|
|
|
|
# If all found events are from ignored users, do not include
|
|
# a summary of the thread.
|
|
if not potential_events:
|
|
continue
|
|
|
|
# The *last* event returned is the one that is cared about.
|
|
event = await self._event_handler.get_event(
|
|
user, room_id, potential_events[-1].event_id
|
|
)
|
|
# It is unexpected that the event will not exist.
|
|
if event is None:
|
|
logger.warning(
|
|
"Unable to fetch latest event in a thread with event ID: %s",
|
|
potential_events[-1].event_id,
|
|
)
|
|
continue
|
|
latest_thread_event = event
|
|
|
|
results[event_id] = _ThreadAggregation(
|
|
latest_event=latest_thread_event,
|
|
count=thread_count,
|
|
# If there's a thread summary it must also exist in the
|
|
# participated dictionary.
|
|
current_user_participated=events_by_id[event_id].sender == user_id
|
|
or participated[event_id],
|
|
)
|
|
|
|
return results
|
|
|
|
@trace
|
|
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 aggregations for the event.
|
|
|
|
Not all requested events may exist in the results (if they don't have
|
|
bundled aggregations).
|
|
|
|
The results may include additional events which are related to the
|
|
requested events.
|
|
"""
|
|
# De-duplicated events by ID to handle the same event requested multiple times.
|
|
events_by_id = {}
|
|
# A map of event ID to the relation in that event, if there is one.
|
|
relations_by_id: Dict[str, str] = {}
|
|
for event in events:
|
|
# State events do not get bundled aggregations.
|
|
if event.is_state():
|
|
continue
|
|
|
|
relates_to = relation_from_event(event)
|
|
if relates_to:
|
|
# An event which is a replacement (ie edit) or annotation (ie,
|
|
# reaction) may not have any other event related to it.
|
|
if relates_to.rel_type in (
|
|
RelationTypes.ANNOTATION,
|
|
RelationTypes.REPLACE,
|
|
):
|
|
continue
|
|
|
|
# Track the event's relation information for later.
|
|
relations_by_id[event.event_id] = relates_to.rel_type
|
|
|
|
# The event should get bundled aggregations.
|
|
events_by_id[event.event_id] = event
|
|
|
|
# event ID -> bundled aggregation in non-serialized form.
|
|
results: Dict[str, BundledAggregations] = {}
|
|
|
|
# Fetch any ignored users of the requesting user.
|
|
ignored_users = await self._main_store.ignored_users(user_id)
|
|
|
|
# Threads are special as the latest event of a thread might cause additional
|
|
# events to be fetched. Thus, we check those first!
|
|
|
|
# Fetch thread summaries (but only for the directly requested events).
|
|
threads = await self._get_threads_for_events(
|
|
events_by_id,
|
|
relations_by_id,
|
|
user_id,
|
|
ignored_users,
|
|
)
|
|
for event_id, thread in threads.items():
|
|
results.setdefault(event_id, BundledAggregations()).thread = thread
|
|
|
|
# If the latest event in a thread is not already being fetched,
|
|
# add it. This ensures that the bundled aggregations for the
|
|
# latest thread event is correct.
|
|
latest_thread_event = thread.latest_event
|
|
if latest_thread_event and latest_thread_event.event_id not in events_by_id:
|
|
events_by_id[latest_thread_event.event_id] = latest_thread_event
|
|
# Keep relations_by_id in sync with events_by_id:
|
|
#
|
|
# We know that the latest event in a thread has a thread relation
|
|
# (as that is what makes it part of the thread).
|
|
relations_by_id[latest_thread_event.event_id] = RelationTypes.THREAD
|
|
|
|
# Fetch other relations per event.
|
|
for event in events_by_id.values():
|
|
# Fetch any annotations (ie, reactions) to bundle with this event.
|
|
annotations = await self.get_annotations_for_event(
|
|
event.event_id, event.room_id, ignored_users=ignored_users
|
|
)
|
|
if annotations:
|
|
results.setdefault(
|
|
event.event_id, BundledAggregations()
|
|
).annotations = {"chunk": annotations}
|
|
|
|
# Fetch any references to bundle with this event.
|
|
references, next_token = await self.get_relations_for_event(
|
|
event.event_id,
|
|
event,
|
|
event.room_id,
|
|
RelationTypes.REFERENCE,
|
|
ignored_users=ignored_users,
|
|
)
|
|
if references:
|
|
aggregations = results.setdefault(event.event_id, BundledAggregations())
|
|
aggregations.references = {
|
|
"chunk": [{"event_id": ev.event_id} for ev in references]
|
|
}
|
|
|
|
if next_token:
|
|
aggregations.references["next_batch"] = await next_token.to_string(
|
|
self._main_store
|
|
)
|
|
|
|
# Fetch any edits (but not for redacted events).
|
|
#
|
|
# Note that there is no use in limiting edits by ignored users since the
|
|
# parent event should be ignored in the first place if the user is ignored.
|
|
edits = await self._main_store.get_applicable_edits(
|
|
[
|
|
event_id
|
|
for event_id, event in events_by_id.items()
|
|
if not event.internal_metadata.is_redacted()
|
|
]
|
|
)
|
|
for event_id, edit in edits.items():
|
|
results.setdefault(event_id, BundledAggregations()).replace = edit
|
|
|
|
return results
|
|
|
|
async def get_threads(
|
|
self,
|
|
requester: Requester,
|
|
room_id: str,
|
|
include: ThreadsListInclude,
|
|
limit: int = 5,
|
|
from_token: Optional[ThreadsNextBatch] = None,
|
|
) -> JsonDict:
|
|
"""Get related events of a event, ordered by topological ordering.
|
|
|
|
Args:
|
|
requester: The user requesting the relations.
|
|
room_id: The room the event belongs to.
|
|
include: One of "all" or "participated" to indicate which threads should
|
|
be returned.
|
|
limit: Only fetch the most recent `limit` events.
|
|
from_token: Fetch rows from the given token, or from the start if None.
|
|
|
|
Returns:
|
|
The pagination chunk.
|
|
"""
|
|
|
|
user_id = requester.user.to_string()
|
|
|
|
# TODO Properly handle a user leaving a room.
|
|
(_, member_event_id) = await self._auth.check_user_in_room_or_world_readable(
|
|
room_id, requester, allow_departed_users=True
|
|
)
|
|
|
|
# Note that ignored users are not passed into get_relations_for_event
|
|
# below. Ignored users are handled in filter_events_for_client (and by
|
|
# not passing them in here we should get a better cache hit rate).
|
|
thread_roots, next_batch = await self._main_store.get_threads(
|
|
room_id=room_id, limit=limit, from_token=from_token
|
|
)
|
|
|
|
events = await self._main_store.get_events_as_list(thread_roots)
|
|
|
|
if include == ThreadsListInclude.participated:
|
|
# Pre-seed thread participation with whether the requester sent the event.
|
|
participated = {event.event_id: event.sender == user_id for event in events}
|
|
# For events the requester did not send, check the database for whether
|
|
# the requester sent a threaded reply.
|
|
participated.update(
|
|
await self._main_store.get_threads_participated(
|
|
[eid for eid, p in participated.items() if not p],
|
|
user_id,
|
|
)
|
|
)
|
|
|
|
# Limit the returned threads to those the user has participated in.
|
|
events = [event for event in events if participated[event.event_id]]
|
|
|
|
events = await filter_events_for_client(
|
|
self._storage_controllers,
|
|
user_id,
|
|
events,
|
|
is_peeking=(member_event_id is None),
|
|
)
|
|
|
|
aggregations = await self.get_bundled_aggregations(
|
|
events, requester.user.to_string()
|
|
)
|
|
|
|
now = self._clock.time_msec()
|
|
serialized_events = self._event_serializer.serialize_events(
|
|
events, now, bundle_aggregations=aggregations
|
|
)
|
|
|
|
return_value: JsonDict = {"chunk": serialized_events}
|
|
|
|
if next_batch:
|
|
return_value["next_batch"] = str(next_batch)
|
|
|
|
return return_value
|