865 lines
31 KiB
Python
865 lines
31 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 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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from __future__ import division
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import itertools
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import logging
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from collections import namedtuple
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from canonicaljson import json
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from twisted.internet import defer
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from synapse.api.constants import EventTypes
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from synapse.api.errors import NotFoundError
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from synapse.api.room_versions import EventFormatVersions
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from synapse.events import FrozenEvent, event_type_from_format_version # noqa: F401
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from synapse.events.snapshot import EventContext # noqa: F401
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from synapse.events.utils import prune_event
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from synapse.logging.context import LoggingContext, PreserveLoggingContext
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.types import get_domain_from_id
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from synapse.util import batch_iter
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from synapse.util.metrics import Measure
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from ._base import SQLBaseStore
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logger = logging.getLogger(__name__)
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# These values are used in the `enqueus_event` and `_do_fetch` methods to
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# control how we batch/bulk fetch events from the database.
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# The values are plucked out of thing air to make initial sync run faster
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# on jki.re
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# TODO: Make these configurable.
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EVENT_QUEUE_THREADS = 3 # Max number of threads that will fetch events
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EVENT_QUEUE_ITERATIONS = 3 # No. times we block waiting for requests for events
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EVENT_QUEUE_TIMEOUT_S = 0.1 # Timeout when waiting for requests for events
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_EventCacheEntry = namedtuple("_EventCacheEntry", ("event", "redacted_event"))
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class EventsWorkerStore(SQLBaseStore):
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def get_received_ts(self, event_id):
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"""Get received_ts (when it was persisted) for the event.
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Raises an exception for unknown events.
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Args:
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event_id (str)
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Returns:
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Deferred[int|None]: Timestamp in milliseconds, or None for events
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that were persisted before received_ts was implemented.
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"""
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return self._simple_select_one_onecol(
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table="events",
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keyvalues={"event_id": event_id},
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retcol="received_ts",
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desc="get_received_ts",
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)
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def get_received_ts_by_stream_pos(self, stream_ordering):
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"""Given a stream ordering get an approximate timestamp of when it
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happened.
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This is done by simply taking the received ts of the first event that
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has a stream ordering greater than or equal to the given stream pos.
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If none exists returns the current time, on the assumption that it must
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have happened recently.
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Args:
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stream_ordering (int)
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Returns:
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Deferred[int]
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"""
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def _get_approximate_received_ts_txn(txn):
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sql = """
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SELECT received_ts FROM events
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WHERE stream_ordering >= ?
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LIMIT 1
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"""
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txn.execute(sql, (stream_ordering,))
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row = txn.fetchone()
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if row and row[0]:
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ts = row[0]
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else:
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ts = self.clock.time_msec()
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return ts
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return self.runInteraction(
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"get_approximate_received_ts", _get_approximate_received_ts_txn
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)
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@defer.inlineCallbacks
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def get_event(
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self,
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event_id,
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check_redacted=True,
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get_prev_content=False,
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allow_rejected=False,
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allow_none=False,
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check_room_id=None,
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):
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"""Get an event from the database by event_id.
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Args:
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event_id (str): The event_id of the event to fetch
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check_redacted (bool): If True, check if event has been redacted
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and redact it.
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get_prev_content (bool): If True and event is a state event,
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include the previous states content in the unsigned field.
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allow_rejected (bool): If True return rejected events.
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allow_none (bool): If True, return None if no event found, if
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False throw a NotFoundError
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check_room_id (str|None): if not None, check the room of the found event.
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If there is a mismatch, behave as per allow_none.
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Returns:
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Deferred[EventBase|None]
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"""
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if not isinstance(event_id, str):
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raise TypeError("Invalid event event_id %r" % (event_id,))
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events = yield self.get_events_as_list(
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[event_id],
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check_redacted=check_redacted,
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get_prev_content=get_prev_content,
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allow_rejected=allow_rejected,
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)
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event = events[0] if events else None
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if event is not None and check_room_id is not None:
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if event.room_id != check_room_id:
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event = None
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if event is None and not allow_none:
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raise NotFoundError("Could not find event %s" % (event_id,))
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return event
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@defer.inlineCallbacks
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def get_events(
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self,
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event_ids,
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check_redacted=True,
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get_prev_content=False,
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allow_rejected=False,
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):
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"""Get events from the database
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Args:
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event_ids (list): The event_ids of the events to fetch
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check_redacted (bool): If True, check if event has been redacted
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and redact it.
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get_prev_content (bool): If True and event is a state event,
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include the previous states content in the unsigned field.
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allow_rejected (bool): If True return rejected events.
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Returns:
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Deferred : Dict from event_id to event.
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"""
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events = yield self.get_events_as_list(
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event_ids,
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check_redacted=check_redacted,
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get_prev_content=get_prev_content,
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allow_rejected=allow_rejected,
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)
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return {e.event_id: e for e in events}
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@defer.inlineCallbacks
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def get_events_as_list(
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self,
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event_ids,
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check_redacted=True,
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get_prev_content=False,
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allow_rejected=False,
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):
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"""Get events from the database and return in a list in the same order
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as given by `event_ids` arg.
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Args:
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event_ids (list): The event_ids of the events to fetch
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check_redacted (bool): If True, check if event has been redacted
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and redact it.
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get_prev_content (bool): If True and event is a state event,
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include the previous states content in the unsigned field.
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allow_rejected (bool): If True return rejected events.
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Returns:
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Deferred[list[EventBase]]: List of events fetched from the database. The
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events are in the same order as `event_ids` arg.
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Note that the returned list may be smaller than the list of event
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IDs if not all events could be fetched.
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"""
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if not event_ids:
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return []
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# there may be duplicates so we cast the list to a set
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event_entry_map = yield self._get_events_from_cache_or_db(
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set(event_ids), allow_rejected=allow_rejected
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)
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events = []
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for event_id in event_ids:
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entry = event_entry_map.get(event_id, None)
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if not entry:
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continue
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if not allow_rejected:
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assert not entry.event.rejected_reason, (
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"rejected event returned from _get_events_from_cache_or_db despite "
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"allow_rejected=False"
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)
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# We may not have had the original event when we received a redaction, so
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# we have to recheck auth now.
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if not allow_rejected and entry.event.type == EventTypes.Redaction:
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redacted_event_id = entry.event.redacts
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event_map = yield self._get_events_from_cache_or_db([redacted_event_id])
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original_event_entry = event_map.get(redacted_event_id)
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if not original_event_entry:
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# we don't have the redacted event (or it was rejected).
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#
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# We assume that the redaction isn't authorized for now; if the
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# redacted event later turns up, the redaction will be re-checked,
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# and if it is found valid, the original will get redacted before it
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# is served to the client.
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logger.debug(
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"Withholding redaction event %s since we don't (yet) have the "
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"original %s",
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event_id,
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redacted_event_id,
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)
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continue
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original_event = original_event_entry.event
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if original_event.type == EventTypes.Create:
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# we never serve redactions of Creates to clients.
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logger.info(
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"Withholding redaction %s of create event %s",
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event_id,
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redacted_event_id,
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)
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continue
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if original_event.room_id != entry.event.room_id:
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logger.info(
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"Withholding redaction %s of event %s from a different room",
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event_id,
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redacted_event_id,
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)
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continue
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if entry.event.internal_metadata.need_to_check_redaction():
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original_domain = get_domain_from_id(original_event.sender)
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redaction_domain = get_domain_from_id(entry.event.sender)
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if original_domain != redaction_domain:
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# the senders don't match, so this is forbidden
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logger.info(
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"Withholding redaction %s whose sender domain %s doesn't "
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"match that of redacted event %s %s",
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event_id,
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redaction_domain,
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redacted_event_id,
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original_domain,
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)
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continue
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# Update the cache to save doing the checks again.
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entry.event.internal_metadata.recheck_redaction = False
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if check_redacted and entry.redacted_event:
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event = entry.redacted_event
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else:
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event = entry.event
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events.append(event)
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if get_prev_content:
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if "replaces_state" in event.unsigned:
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prev = yield self.get_event(
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event.unsigned["replaces_state"],
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get_prev_content=False,
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allow_none=True,
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)
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if prev:
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event.unsigned = dict(event.unsigned)
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event.unsigned["prev_content"] = prev.content
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event.unsigned["prev_sender"] = prev.sender
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return events
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@defer.inlineCallbacks
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def _get_events_from_cache_or_db(self, event_ids, allow_rejected=False):
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"""Fetch a bunch of events from the cache or the database.
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If events are pulled from the database, they will be cached for future lookups.
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Args:
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event_ids (Iterable[str]): The event_ids of the events to fetch
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allow_rejected (bool): Whether to include rejected events
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Returns:
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Deferred[Dict[str, _EventCacheEntry]]:
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map from event id to result
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"""
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event_entry_map = self._get_events_from_cache(
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event_ids, allow_rejected=allow_rejected
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)
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missing_events_ids = [e for e in event_ids if e not in event_entry_map]
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if missing_events_ids:
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log_ctx = LoggingContext.current_context()
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log_ctx.record_event_fetch(len(missing_events_ids))
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# Note that _get_events_from_db is also responsible for turning db rows
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# into FrozenEvents (via _get_event_from_row), which involves seeing if
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# the events have been redacted, and if so pulling the redaction event out
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# of the database to check it.
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#
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missing_events = yield self._get_events_from_db(
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missing_events_ids, allow_rejected=allow_rejected
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)
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event_entry_map.update(missing_events)
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return event_entry_map
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def _invalidate_get_event_cache(self, event_id):
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self._get_event_cache.invalidate((event_id,))
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def _get_events_from_cache(self, events, allow_rejected, update_metrics=True):
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"""Fetch events from the caches
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Args:
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events (Iterable[str]): list of event_ids to fetch
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allow_rejected (bool): Whether to return events that were rejected
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update_metrics (bool): Whether to update the cache hit ratio metrics
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Returns:
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dict of event_id -> _EventCacheEntry for each event_id in cache. If
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allow_rejected is `False` then there will still be an entry but it
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will be `None`
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"""
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event_map = {}
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for event_id in events:
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ret = self._get_event_cache.get(
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(event_id,), None, update_metrics=update_metrics
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)
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if not ret:
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continue
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if allow_rejected or not ret.event.rejected_reason:
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event_map[event_id] = ret
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else:
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event_map[event_id] = None
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return event_map
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def _do_fetch(self, conn):
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"""Takes a database connection and waits for requests for events from
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the _event_fetch_list queue.
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"""
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i = 0
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while True:
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with self._event_fetch_lock:
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event_list = self._event_fetch_list
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self._event_fetch_list = []
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if not event_list:
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single_threaded = self.database_engine.single_threaded
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if single_threaded or i > EVENT_QUEUE_ITERATIONS:
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self._event_fetch_ongoing -= 1
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return
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else:
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self._event_fetch_lock.wait(EVENT_QUEUE_TIMEOUT_S)
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i += 1
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continue
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i = 0
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self._fetch_event_list(conn, event_list)
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def _fetch_event_list(self, conn, event_list):
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"""Handle a load of requests from the _event_fetch_list queue
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Args:
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conn (twisted.enterprise.adbapi.Connection): database connection
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event_list (list[Tuple[list[str], Deferred]]):
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The fetch requests. Each entry consists of a list of event
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ids to be fetched, and a deferred to be completed once the
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events have been fetched.
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The deferreds are callbacked with a dictionary mapping from event id
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to event row. Note that it may well contain additional events that
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were not part of this request.
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"""
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with Measure(self._clock, "_fetch_event_list"):
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try:
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events_to_fetch = set(
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event_id for events, _ in event_list for event_id in events
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)
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row_dict = self._new_transaction(
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conn, "do_fetch", [], [], self._fetch_event_rows, events_to_fetch
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)
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# We only want to resolve deferreds from the main thread
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def fire():
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for _, d in event_list:
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d.callback(row_dict)
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with PreserveLoggingContext():
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self.hs.get_reactor().callFromThread(fire)
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except Exception as e:
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logger.exception("do_fetch")
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# We only want to resolve deferreds from the main thread
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def fire(evs, exc):
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for _, d in evs:
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if not d.called:
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with PreserveLoggingContext():
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d.errback(exc)
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with PreserveLoggingContext():
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self.hs.get_reactor().callFromThread(fire, event_list, e)
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@defer.inlineCallbacks
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def _get_events_from_db(self, event_ids, allow_rejected=False):
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"""Fetch a bunch of events from the database.
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Returned events will be added to the cache for future lookups.
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Args:
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event_ids (Iterable[str]): The event_ids of the events to fetch
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allow_rejected (bool): Whether to include rejected events
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Returns:
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Deferred[Dict[str, _EventCacheEntry]]:
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map from event id to result. May return extra events which
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weren't asked for.
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"""
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fetched_events = {}
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events_to_fetch = event_ids
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while events_to_fetch:
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row_map = yield self._enqueue_events(events_to_fetch)
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# we need to recursively fetch any redactions of those events
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redaction_ids = set()
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for event_id in events_to_fetch:
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row = row_map.get(event_id)
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fetched_events[event_id] = row
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if row:
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redaction_ids.update(row["redactions"])
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events_to_fetch = redaction_ids.difference(fetched_events.keys())
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if events_to_fetch:
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logger.debug("Also fetching redaction events %s", events_to_fetch)
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# build a map from event_id to EventBase
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event_map = {}
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for event_id, row in fetched_events.items():
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if not row:
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continue
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assert row["event_id"] == event_id
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rejected_reason = row["rejected_reason"]
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if not allow_rejected and rejected_reason:
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continue
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d = json.loads(row["json"])
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internal_metadata = json.loads(row["internal_metadata"])
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format_version = row["format_version"]
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if format_version is None:
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# This means that we stored the event before we had the concept
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# of a event format version, so it must be a V1 event.
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format_version = EventFormatVersions.V1
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original_ev = event_type_from_format_version(format_version)(
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event_dict=d,
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internal_metadata_dict=internal_metadata,
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rejected_reason=rejected_reason,
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)
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event_map[event_id] = original_ev
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# finally, we can decide whether each one nededs redacting, and build
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# the cache entries.
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result_map = {}
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for event_id, original_ev in event_map.items():
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redactions = fetched_events[event_id]["redactions"]
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redacted_event = self._maybe_redact_event_row(
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original_ev, redactions, event_map
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)
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cache_entry = _EventCacheEntry(
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event=original_ev, redacted_event=redacted_event
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)
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self._get_event_cache.prefill((event_id,), cache_entry)
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result_map[event_id] = cache_entry
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return result_map
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|
|
@defer.inlineCallbacks
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|
def _enqueue_events(self, events):
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|
"""Fetches events from the database using the _event_fetch_list. This
|
|
allows batch and bulk fetching of events - it allows us to fetch events
|
|
without having to create a new transaction for each request for events.
|
|
|
|
Args:
|
|
events (Iterable[str]): events to be fetched.
|
|
|
|
Returns:
|
|
Deferred[Dict[str, Dict]]: map from event id to row data from the database.
|
|
May contain events that weren't requested.
|
|
"""
|
|
|
|
events_d = defer.Deferred()
|
|
with self._event_fetch_lock:
|
|
self._event_fetch_list.append((events, events_d))
|
|
|
|
self._event_fetch_lock.notify()
|
|
|
|
if self._event_fetch_ongoing < EVENT_QUEUE_THREADS:
|
|
self._event_fetch_ongoing += 1
|
|
should_start = True
|
|
else:
|
|
should_start = False
|
|
|
|
if should_start:
|
|
run_as_background_process(
|
|
"fetch_events", self.runWithConnection, self._do_fetch
|
|
)
|
|
|
|
logger.debug("Loading %d events: %s", len(events), events)
|
|
with PreserveLoggingContext():
|
|
row_map = yield events_d
|
|
logger.debug("Loaded %d events (%d rows)", len(events), len(row_map))
|
|
|
|
return row_map
|
|
|
|
def _fetch_event_rows(self, txn, event_ids):
|
|
"""Fetch event rows from the database
|
|
|
|
Events which are not found are omitted from the result.
|
|
|
|
The returned per-event dicts contain the following keys:
|
|
|
|
* event_id (str)
|
|
|
|
* json (str): json-encoded event structure
|
|
|
|
* internal_metadata (str): json-encoded internal metadata dict
|
|
|
|
* format_version (int|None): The format of the event. Hopefully one
|
|
of EventFormatVersions. 'None' means the event predates
|
|
EventFormatVersions (so the event is format V1).
|
|
|
|
* rejected_reason (str|None): if the event was rejected, the reason
|
|
why.
|
|
|
|
* redactions (List[str]): a list of event-ids which (claim to) redact
|
|
this event.
|
|
|
|
Args:
|
|
txn (twisted.enterprise.adbapi.Connection):
|
|
event_ids (Iterable[str]): event IDs to fetch
|
|
|
|
Returns:
|
|
Dict[str, Dict]: a map from event id to event info.
|
|
"""
|
|
event_dict = {}
|
|
for evs in batch_iter(event_ids, 200):
|
|
sql = (
|
|
"SELECT "
|
|
" e.event_id, "
|
|
" e.internal_metadata,"
|
|
" e.json,"
|
|
" e.format_version, "
|
|
" rej.reason "
|
|
" FROM event_json as e"
|
|
" LEFT JOIN rejections as rej USING (event_id)"
|
|
" WHERE e.event_id IN (%s)"
|
|
) % (",".join(["?"] * len(evs)),)
|
|
|
|
txn.execute(sql, evs)
|
|
|
|
for row in txn:
|
|
event_id = row[0]
|
|
event_dict[event_id] = {
|
|
"event_id": event_id,
|
|
"internal_metadata": row[1],
|
|
"json": row[2],
|
|
"format_version": row[3],
|
|
"rejected_reason": row[4],
|
|
"redactions": [],
|
|
}
|
|
|
|
# check for redactions
|
|
redactions_sql = (
|
|
"SELECT event_id, redacts FROM redactions WHERE redacts IN (%s)"
|
|
) % (",".join(["?"] * len(evs)),)
|
|
|
|
txn.execute(redactions_sql, evs)
|
|
|
|
for (redacter, redacted) in txn:
|
|
d = event_dict.get(redacted)
|
|
if d:
|
|
d["redactions"].append(redacter)
|
|
|
|
return event_dict
|
|
|
|
def _maybe_redact_event_row(self, original_ev, redactions, event_map):
|
|
"""Given an event object and a list of possible redacting event ids,
|
|
determine whether to honour any of those redactions and if so return a redacted
|
|
event.
|
|
|
|
Args:
|
|
original_ev (EventBase):
|
|
redactions (iterable[str]): list of event ids of potential redaction events
|
|
event_map (dict[str, EventBase]): other events which have been fetched, in
|
|
which we can look up the redaaction events. Map from event id to event.
|
|
|
|
Returns:
|
|
Deferred[EventBase|None]: if the event should be redacted, a pruned
|
|
event object. Otherwise, None.
|
|
"""
|
|
if original_ev.type == "m.room.create":
|
|
# we choose to ignore redactions of m.room.create events.
|
|
return None
|
|
|
|
for redaction_id in redactions:
|
|
redaction_event = event_map.get(redaction_id)
|
|
if not redaction_event or redaction_event.rejected_reason:
|
|
# we don't have the redaction event, or the redaction event was not
|
|
# authorized.
|
|
logger.debug(
|
|
"%s was redacted by %s but redaction not found/authed",
|
|
original_ev.event_id,
|
|
redaction_id,
|
|
)
|
|
continue
|
|
|
|
if redaction_event.room_id != original_ev.room_id:
|
|
logger.debug(
|
|
"%s was redacted by %s but redaction was in a different room!",
|
|
original_ev.event_id,
|
|
redaction_id,
|
|
)
|
|
continue
|
|
|
|
# Starting in room version v3, some redactions need to be
|
|
# rechecked if we didn't have the redacted event at the
|
|
# time, so we recheck on read instead.
|
|
if redaction_event.internal_metadata.need_to_check_redaction():
|
|
expected_domain = get_domain_from_id(original_ev.sender)
|
|
if get_domain_from_id(redaction_event.sender) == expected_domain:
|
|
# This redaction event is allowed. Mark as not needing a recheck.
|
|
redaction_event.internal_metadata.recheck_redaction = False
|
|
else:
|
|
# Senders don't match, so the event isn't actually redacted
|
|
logger.debug(
|
|
"%s was redacted by %s but the senders don't match",
|
|
original_ev.event_id,
|
|
redaction_id,
|
|
)
|
|
continue
|
|
|
|
logger.debug("Redacting %s due to %s", original_ev.event_id, redaction_id)
|
|
|
|
# we found a good redaction event. Redact!
|
|
redacted_event = prune_event(original_ev)
|
|
redacted_event.unsigned["redacted_by"] = redaction_id
|
|
|
|
# It's fine to add the event directly, since get_pdu_json
|
|
# will serialise this field correctly
|
|
redacted_event.unsigned["redacted_because"] = redaction_event
|
|
|
|
return redacted_event
|
|
|
|
# no valid redaction found for this event
|
|
return None
|
|
|
|
@defer.inlineCallbacks
|
|
def have_events_in_timeline(self, event_ids):
|
|
"""Given a list of event ids, check if we have already processed and
|
|
stored them as non outliers.
|
|
"""
|
|
rows = yield self._simple_select_many_batch(
|
|
table="events",
|
|
retcols=("event_id",),
|
|
column="event_id",
|
|
iterable=list(event_ids),
|
|
keyvalues={"outlier": False},
|
|
desc="have_events_in_timeline",
|
|
)
|
|
|
|
return set(r["event_id"] for r in rows)
|
|
|
|
@defer.inlineCallbacks
|
|
def have_seen_events(self, event_ids):
|
|
"""Given a list of event ids, check if we have already processed them.
|
|
|
|
Args:
|
|
event_ids (iterable[str]):
|
|
|
|
Returns:
|
|
Deferred[set[str]]: The events we have already seen.
|
|
"""
|
|
results = set()
|
|
|
|
def have_seen_events_txn(txn, chunk):
|
|
sql = "SELECT event_id FROM events as e WHERE e.event_id IN (%s)" % (
|
|
",".join("?" * len(chunk)),
|
|
)
|
|
txn.execute(sql, chunk)
|
|
for (event_id,) in txn:
|
|
results.add(event_id)
|
|
|
|
# break the input up into chunks of 100
|
|
input_iterator = iter(event_ids)
|
|
for chunk in iter(lambda: list(itertools.islice(input_iterator, 100)), []):
|
|
yield self.runInteraction("have_seen_events", have_seen_events_txn, chunk)
|
|
return results
|
|
|
|
def get_seen_events_with_rejections(self, event_ids):
|
|
"""Given a list of event ids, check if we rejected them.
|
|
|
|
Args:
|
|
event_ids (list[str])
|
|
|
|
Returns:
|
|
Deferred[dict[str, str|None):
|
|
Has an entry for each event id we already have seen. Maps to
|
|
the rejected reason string if we rejected the event, else maps
|
|
to None.
|
|
"""
|
|
if not event_ids:
|
|
return defer.succeed({})
|
|
|
|
def f(txn):
|
|
sql = (
|
|
"SELECT e.event_id, reason FROM events as e "
|
|
"LEFT JOIN rejections as r ON e.event_id = r.event_id "
|
|
"WHERE e.event_id = ?"
|
|
)
|
|
|
|
res = {}
|
|
for event_id in event_ids:
|
|
txn.execute(sql, (event_id,))
|
|
row = txn.fetchone()
|
|
if row:
|
|
_, rejected = row
|
|
res[event_id] = rejected
|
|
|
|
return res
|
|
|
|
return self.runInteraction("get_seen_events_with_rejections", f)
|
|
|
|
def _get_total_state_event_counts_txn(self, txn, room_id):
|
|
"""
|
|
See get_total_state_event_counts.
|
|
"""
|
|
# We join against the events table as that has an index on room_id
|
|
sql = """
|
|
SELECT COUNT(*) FROM state_events
|
|
INNER JOIN events USING (room_id, event_id)
|
|
WHERE room_id=?
|
|
"""
|
|
txn.execute(sql, (room_id,))
|
|
row = txn.fetchone()
|
|
return row[0] if row else 0
|
|
|
|
def get_total_state_event_counts(self, room_id):
|
|
"""
|
|
Gets the total number of state events in a room.
|
|
|
|
Args:
|
|
room_id (str)
|
|
|
|
Returns:
|
|
Deferred[int]
|
|
"""
|
|
return self.runInteraction(
|
|
"get_total_state_event_counts",
|
|
self._get_total_state_event_counts_txn,
|
|
room_id,
|
|
)
|
|
|
|
def _get_current_state_event_counts_txn(self, txn, room_id):
|
|
"""
|
|
See get_current_state_event_counts.
|
|
"""
|
|
sql = "SELECT COUNT(*) FROM current_state_events WHERE room_id=?"
|
|
txn.execute(sql, (room_id,))
|
|
row = txn.fetchone()
|
|
return row[0] if row else 0
|
|
|
|
def get_current_state_event_counts(self, room_id):
|
|
"""
|
|
Gets the current number of state events in a room.
|
|
|
|
Args:
|
|
room_id (str)
|
|
|
|
Returns:
|
|
Deferred[int]
|
|
"""
|
|
return self.runInteraction(
|
|
"get_current_state_event_counts",
|
|
self._get_current_state_event_counts_txn,
|
|
room_id,
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_room_complexity(self, room_id):
|
|
"""
|
|
Get a rough approximation of the complexity of the room. This is used by
|
|
remote servers to decide whether they wish to join the room or not.
|
|
Higher complexity value indicates that being in the room will consume
|
|
more resources.
|
|
|
|
Args:
|
|
room_id (str)
|
|
|
|
Returns:
|
|
Deferred[dict[str:int]] of complexity version to complexity.
|
|
"""
|
|
state_events = yield self.get_current_state_event_counts(room_id)
|
|
|
|
# Call this one "v1", so we can introduce new ones as we want to develop
|
|
# it.
|
|
complexity_v1 = round(state_events / 500, 2)
|
|
|
|
return {"v1": complexity_v1}
|