mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-10-01 11:49:51 -04:00
1221 lines
46 KiB
Python
1221 lines
46 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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import threading
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from collections import namedtuple
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from typing import Dict, Iterable, List, Optional, Tuple, overload
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from constantly import NamedConstant, Names
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from typing_extensions import Literal
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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, SynapseError
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from synapse.api.room_versions import (
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KNOWN_ROOM_VERSIONS,
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EventFormatVersions,
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RoomVersions,
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)
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from synapse.events import EventBase, make_event_from_dict
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from synapse.events.utils import prune_event
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from synapse.logging.context import PreserveLoggingContext, current_context
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
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from synapse.replication.tcp.streams import BackfillStream
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from synapse.replication.tcp.streams.events import EventsStream
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from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
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from synapse.storage.database import DatabasePool
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from synapse.storage.util.id_generators import StreamIdGenerator
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from synapse.types import Collection, get_domain_from_id
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from synapse.util.caches.descriptors import Cache, cached
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from synapse.util.iterutils import batch_iter
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from synapse.util.metrics import Measure
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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 EventRedactBehaviour(Names):
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"""
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What to do when retrieving a redacted event from the database.
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"""
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AS_IS = NamedConstant()
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REDACT = NamedConstant()
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BLOCK = NamedConstant()
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class EventsWorkerStore(SQLBaseStore):
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def __init__(self, database: DatabasePool, db_conn, hs):
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super(EventsWorkerStore, self).__init__(database, db_conn, hs)
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if hs.config.worker.writers.events == hs.get_instance_name():
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# We are the process in charge of generating stream ids for events,
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# so instantiate ID generators based on the database
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self._stream_id_gen = StreamIdGenerator(
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db_conn, "events", "stream_ordering",
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)
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self._backfill_id_gen = StreamIdGenerator(
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db_conn,
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"events",
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"stream_ordering",
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step=-1,
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extra_tables=[("ex_outlier_stream", "event_stream_ordering")],
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)
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else:
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# Another process is in charge of persisting events and generating
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# stream IDs: rely on the replication streams to let us know which
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# IDs we can process.
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self._stream_id_gen = SlavedIdTracker(db_conn, "events", "stream_ordering")
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self._backfill_id_gen = SlavedIdTracker(
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db_conn, "events", "stream_ordering", step=-1
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)
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self._get_event_cache = Cache(
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"*getEvent*",
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keylen=3,
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max_entries=hs.config.caches.event_cache_size,
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apply_cache_factor_from_config=False,
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)
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self._event_fetch_lock = threading.Condition()
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self._event_fetch_list = []
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self._event_fetch_ongoing = 0
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def process_replication_rows(self, stream_name, instance_name, token, rows):
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if stream_name == EventsStream.NAME:
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self._stream_id_gen.advance(token)
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elif stream_name == BackfillStream.NAME:
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self._backfill_id_gen.advance(-token)
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super().process_replication_rows(stream_name, instance_name, token, rows)
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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.db_pool.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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# Inform mypy that if allow_none is False (the default) then get_event
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# always returns an EventBase.
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@overload
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async def get_event(
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self,
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event_id: str,
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redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
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get_prev_content: bool = False,
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allow_rejected: bool = False,
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allow_none: Literal[False] = False,
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check_room_id: Optional[str] = None,
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) -> EventBase:
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...
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@overload
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async def get_event(
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self,
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event_id: str,
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redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
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get_prev_content: bool = False,
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allow_rejected: bool = False,
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allow_none: Literal[True] = False,
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check_room_id: Optional[str] = None,
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) -> Optional[EventBase]:
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...
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async def get_event(
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self,
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event_id: str,
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redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
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get_prev_content: bool = False,
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allow_rejected: bool = False,
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allow_none: bool = False,
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check_room_id: Optional[str] = None,
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) -> Optional[EventBase]:
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"""Get an event from the database by event_id.
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Args:
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event_id: The event_id of the event to fetch
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redact_behaviour: Determine what to do with a redacted event. Possible values:
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* AS_IS - Return the full event body with no redacted content
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* REDACT - Return the event but with a redacted body
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* DISALLOW - Do not return redacted events (behave as per allow_none
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if the event is redacted)
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get_prev_content: 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: If True, return rejected events. Otherwise,
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behave as per allow_none.
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allow_none: If True, return None if no event found, if
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False throw a NotFoundError
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check_room_id: 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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The event, or None if the event was not found.
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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 = await self.get_events_as_list(
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[event_id],
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redact_behaviour=redact_behaviour,
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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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async def get_events(
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self,
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event_ids: Iterable[str],
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redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
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get_prev_content: bool = False,
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allow_rejected: bool = False,
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) -> Dict[str, EventBase]:
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"""Get events from the database
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Args:
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event_ids: The event_ids of the events to fetch
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redact_behaviour: Determine what to do with a redacted event. Possible
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values:
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* AS_IS - Return the full event body with no redacted content
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* REDACT - Return the event but with a redacted body
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* DISALLOW - Do not return redacted events (omit them from the response)
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get_prev_content: 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: If True, return rejected events. Otherwise,
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omits rejeted events from the response.
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Returns:
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A mapping from event_id to event.
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"""
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events = await self.get_events_as_list(
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event_ids,
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redact_behaviour=redact_behaviour,
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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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async def get_events_as_list(
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self,
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event_ids: Collection[str],
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redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
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get_prev_content: bool = False,
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allow_rejected: bool = False,
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) -> List[EventBase]:
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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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Unknown events will be omitted from the response.
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Args:
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event_ids: The event_ids of the events to fetch
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redact_behaviour: Determine what to do with a redacted event. Possible values:
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* AS_IS - Return the full event body with no redacted content
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* REDACT - Return the event but with a redacted body
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* DISALLOW - Do not return redacted events (omit them from the response)
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get_prev_content: 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: If True, return rejected events. Otherwise,
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omits rejected events from the response.
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Returns:
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List of events fetched from the database. The events are in the same
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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 = await 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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if entry.event.redacts is None:
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# A redacted redaction doesn't have a `redacts` key, in
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# which case lets just withhold the event.
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#
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# Note: Most of the time if the redactions has been
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# redacted we still have the un-redacted event in the DB
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# and so we'll still see the `redacts` key. However, this
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# isn't always true e.g. if we have censored the event.
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logger.debug(
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"Withholding redaction event %s as we don't have redacts key",
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event_id,
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)
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continue
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redacted_event_id = entry.event.redacts
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event_map = await 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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event = entry.event
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if entry.redacted_event:
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if redact_behaviour == EventRedactBehaviour.BLOCK:
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# Skip this event
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continue
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elif redact_behaviour == EventRedactBehaviour.REDACT:
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event = entry.redacted_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 = await 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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async 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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Unknown events are omitted from the response.
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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. If False,
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rejected events are omitted from the response.
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Returns:
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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 = 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 = await 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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|
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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
|
|
to event row. Note that it may well contain additional events that
|
|
were not part of this request.
|
|
"""
|
|
with Measure(self._clock, "_fetch_event_list"):
|
|
try:
|
|
events_to_fetch = {
|
|
event_id for events, _ in event_list for event_id in events
|
|
}
|
|
|
|
row_dict = self.db_pool.new_transaction(
|
|
conn, "do_fetch", [], [], self._fetch_event_rows, events_to_fetch
|
|
)
|
|
|
|
# We only want to resolve deferreds from the main thread
|
|
def fire():
|
|
for _, d in event_list:
|
|
d.callback(row_dict)
|
|
|
|
with PreserveLoggingContext():
|
|
self.hs.get_reactor().callFromThread(fire)
|
|
except Exception as e:
|
|
logger.exception("do_fetch")
|
|
|
|
# We only want to resolve deferreds from the main thread
|
|
def fire(evs, exc):
|
|
for _, d in evs:
|
|
if not d.called:
|
|
with PreserveLoggingContext():
|
|
d.errback(exc)
|
|
|
|
with PreserveLoggingContext():
|
|
self.hs.get_reactor().callFromThread(fire, event_list, e)
|
|
|
|
async def _get_events_from_db(self, event_ids, allow_rejected=False):
|
|
"""Fetch a bunch of events from the database.
|
|
|
|
Returned events will be added to the cache for future lookups.
|
|
|
|
Unknown events are omitted from the response.
|
|
|
|
Args:
|
|
event_ids (Iterable[str]): The event_ids of the events to fetch
|
|
|
|
allow_rejected (bool): Whether to include rejected events. If False,
|
|
rejected events are omitted from the response.
|
|
|
|
Returns:
|
|
Dict[str, _EventCacheEntry]:
|
|
map from event id to result. May return extra events which
|
|
weren't asked for.
|
|
"""
|
|
fetched_events = {}
|
|
events_to_fetch = event_ids
|
|
|
|
while events_to_fetch:
|
|
row_map = await self._enqueue_events(events_to_fetch)
|
|
|
|
# we need to recursively fetch any redactions of those events
|
|
redaction_ids = set()
|
|
for event_id in events_to_fetch:
|
|
row = row_map.get(event_id)
|
|
fetched_events[event_id] = row
|
|
if row:
|
|
redaction_ids.update(row["redactions"])
|
|
|
|
events_to_fetch = redaction_ids.difference(fetched_events.keys())
|
|
if events_to_fetch:
|
|
logger.debug("Also fetching redaction events %s", events_to_fetch)
|
|
|
|
# build a map from event_id to EventBase
|
|
event_map = {}
|
|
for event_id, row in fetched_events.items():
|
|
if not row:
|
|
continue
|
|
assert row["event_id"] == event_id
|
|
|
|
rejected_reason = row["rejected_reason"]
|
|
|
|
if not allow_rejected and rejected_reason:
|
|
continue
|
|
|
|
d = db_to_json(row["json"])
|
|
internal_metadata = db_to_json(row["internal_metadata"])
|
|
|
|
format_version = row["format_version"]
|
|
if format_version is None:
|
|
# This means that we stored the event before we had the concept
|
|
# of a event format version, so it must be a V1 event.
|
|
format_version = EventFormatVersions.V1
|
|
|
|
room_version_id = row["room_version_id"]
|
|
|
|
if not room_version_id:
|
|
# this should only happen for out-of-band membership events
|
|
if not internal_metadata.get("out_of_band_membership"):
|
|
logger.warning(
|
|
"Room %s for event %s is unknown", d["room_id"], event_id
|
|
)
|
|
continue
|
|
|
|
# take a wild stab at the room version based on the event format
|
|
if format_version == EventFormatVersions.V1:
|
|
room_version = RoomVersions.V1
|
|
elif format_version == EventFormatVersions.V2:
|
|
room_version = RoomVersions.V3
|
|
else:
|
|
room_version = RoomVersions.V5
|
|
else:
|
|
room_version = KNOWN_ROOM_VERSIONS.get(room_version_id)
|
|
if not room_version:
|
|
logger.warning(
|
|
"Event %s in room %s has unknown room version %s",
|
|
event_id,
|
|
d["room_id"],
|
|
room_version_id,
|
|
)
|
|
continue
|
|
|
|
if room_version.event_format != format_version:
|
|
logger.error(
|
|
"Event %s in room %s with version %s has wrong format: "
|
|
"expected %s, was %s",
|
|
event_id,
|
|
d["room_id"],
|
|
room_version_id,
|
|
room_version.event_format,
|
|
format_version,
|
|
)
|
|
continue
|
|
|
|
original_ev = make_event_from_dict(
|
|
event_dict=d,
|
|
room_version=room_version,
|
|
internal_metadata_dict=internal_metadata,
|
|
rejected_reason=rejected_reason,
|
|
)
|
|
|
|
event_map[event_id] = original_ev
|
|
|
|
# finally, we can decide whether each one needs redacting, and build
|
|
# the cache entries.
|
|
result_map = {}
|
|
for event_id, original_ev in event_map.items():
|
|
redactions = fetched_events[event_id]["redactions"]
|
|
redacted_event = self._maybe_redact_event_row(
|
|
original_ev, redactions, event_map
|
|
)
|
|
|
|
cache_entry = _EventCacheEntry(
|
|
event=original_ev, redacted_event=redacted_event
|
|
)
|
|
|
|
self._get_event_cache.prefill((event_id,), cache_entry)
|
|
result_map[event_id] = cache_entry
|
|
|
|
return result_map
|
|
|
|
async def _enqueue_events(self, events):
|
|
"""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:
|
|
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.db_pool.runWithConnection, self._do_fetch
|
|
)
|
|
|
|
logger.debug("Loading %d events: %s", len(events), events)
|
|
with PreserveLoggingContext():
|
|
row_map = await 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).
|
|
|
|
* room_version_id (str|None): The version of the room which contains the event.
|
|
Hopefully one of RoomVersions.
|
|
|
|
Due to historical reasons, there may be a few events in the database which
|
|
do not have an associated room; in this case None will be returned here.
|
|
|
|
* 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,
|
|
r.room_version,
|
|
rej.reason
|
|
FROM event_json as e
|
|
LEFT JOIN rooms r USING (room_id)
|
|
LEFT JOIN rejections as rej USING (event_id)
|
|
WHERE """
|
|
|
|
clause, args = make_in_list_sql_clause(
|
|
txn.database_engine, "e.event_id", evs
|
|
)
|
|
|
|
txn.execute(sql + clause, args)
|
|
|
|
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],
|
|
"room_version_id": row[4],
|
|
"rejected_reason": row[5],
|
|
"redactions": [],
|
|
}
|
|
|
|
# check for redactions
|
|
redactions_sql = "SELECT event_id, redacts FROM redactions WHERE "
|
|
|
|
clause, args = make_in_list_sql_clause(txn.database_engine, "redacts", evs)
|
|
|
|
txn.execute(redactions_sql + clause, args)
|
|
|
|
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
|
|
|
|
async 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 = await self.db_pool.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 {r["event_id"] for r in rows}
|
|
|
|
async 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:
|
|
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 "
|
|
clause, args = make_in_list_sql_clause(
|
|
txn.database_engine, "e.event_id", chunk
|
|
)
|
|
txn.execute(sql + clause, args)
|
|
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)), []):
|
|
await self.db_pool.runInteraction(
|
|
"have_seen_events", have_seen_events_txn, chunk
|
|
)
|
|
return results
|
|
|
|
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.db_pool.runInteraction(
|
|
"get_current_state_event_counts",
|
|
self._get_current_state_event_counts_txn,
|
|
room_id,
|
|
)
|
|
|
|
async 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:
|
|
dict[str:int] of complexity version to complexity.
|
|
"""
|
|
state_events = await 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}
|
|
|
|
def get_current_backfill_token(self):
|
|
"""The current minimum token that backfilled events have reached"""
|
|
return -self._backfill_id_gen.get_current_token()
|
|
|
|
def get_current_events_token(self):
|
|
"""The current maximum token that events have reached"""
|
|
return self._stream_id_gen.get_current_token()
|
|
|
|
def get_all_new_forward_event_rows(self, last_id, current_id, limit):
|
|
"""Returns new events, for the Events replication stream
|
|
|
|
Args:
|
|
last_id: the last stream_id from the previous batch.
|
|
current_id: the maximum stream_id to return up to
|
|
limit: the maximum number of rows to return
|
|
|
|
Returns: Deferred[List[Tuple]]
|
|
a list of events stream rows. Each tuple consists of a stream id as
|
|
the first element, followed by fields suitable for casting into an
|
|
EventsStreamRow.
|
|
"""
|
|
|
|
def get_all_new_forward_event_rows(txn):
|
|
sql = (
|
|
"SELECT e.stream_ordering, e.event_id, e.room_id, e.type,"
|
|
" state_key, redacts, relates_to_id"
|
|
" FROM events AS e"
|
|
" LEFT JOIN redactions USING (event_id)"
|
|
" LEFT JOIN state_events USING (event_id)"
|
|
" LEFT JOIN event_relations USING (event_id)"
|
|
" WHERE ? < stream_ordering AND stream_ordering <= ?"
|
|
" ORDER BY stream_ordering ASC"
|
|
" LIMIT ?"
|
|
)
|
|
txn.execute(sql, (last_id, current_id, limit))
|
|
return txn.fetchall()
|
|
|
|
return self.db_pool.runInteraction(
|
|
"get_all_new_forward_event_rows", get_all_new_forward_event_rows
|
|
)
|
|
|
|
def get_ex_outlier_stream_rows(self, last_id, current_id):
|
|
"""Returns de-outliered events, for the Events replication stream
|
|
|
|
Args:
|
|
last_id: the last stream_id from the previous batch.
|
|
current_id: the maximum stream_id to return up to
|
|
|
|
Returns: Deferred[List[Tuple]]
|
|
a list of events stream rows. Each tuple consists of a stream id as
|
|
the first element, followed by fields suitable for casting into an
|
|
EventsStreamRow.
|
|
"""
|
|
|
|
def get_ex_outlier_stream_rows_txn(txn):
|
|
sql = (
|
|
"SELECT event_stream_ordering, e.event_id, e.room_id, e.type,"
|
|
" state_key, redacts, relates_to_id"
|
|
" FROM events AS e"
|
|
" INNER JOIN ex_outlier_stream USING (event_id)"
|
|
" LEFT JOIN redactions USING (event_id)"
|
|
" LEFT JOIN state_events USING (event_id)"
|
|
" LEFT JOIN event_relations USING (event_id)"
|
|
" WHERE ? < event_stream_ordering"
|
|
" AND event_stream_ordering <= ?"
|
|
" ORDER BY event_stream_ordering ASC"
|
|
)
|
|
|
|
txn.execute(sql, (last_id, current_id))
|
|
return txn.fetchall()
|
|
|
|
return self.db_pool.runInteraction(
|
|
"get_ex_outlier_stream_rows", get_ex_outlier_stream_rows_txn
|
|
)
|
|
|
|
async def get_all_new_backfill_event_rows(
|
|
self, instance_name: str, last_id: int, current_id: int, limit: int
|
|
) -> Tuple[List[Tuple[int, list]], int, bool]:
|
|
"""Get updates for backfill replication stream, including all new
|
|
backfilled events and events that have gone from being outliers to not.
|
|
|
|
Args:
|
|
instance_name: The writer we want to fetch updates from. Unused
|
|
here since there is only ever one writer.
|
|
last_id: The token to fetch updates from. Exclusive.
|
|
current_id: The token to fetch updates up to. Inclusive.
|
|
limit: The requested limit for the number of rows to return. The
|
|
function may return more or fewer rows.
|
|
|
|
Returns:
|
|
A tuple consisting of: the updates, a token to use to fetch
|
|
subsequent updates, and whether we returned fewer rows than exists
|
|
between the requested tokens due to the limit.
|
|
|
|
The token returned can be used in a subsequent call to this
|
|
function to get further updatees.
|
|
|
|
The updates are a list of 2-tuples of stream ID and the row data
|
|
"""
|
|
if last_id == current_id:
|
|
return [], current_id, False
|
|
|
|
def get_all_new_backfill_event_rows(txn):
|
|
sql = (
|
|
"SELECT -e.stream_ordering, e.event_id, e.room_id, e.type,"
|
|
" state_key, redacts, relates_to_id"
|
|
" FROM events AS e"
|
|
" LEFT JOIN redactions USING (event_id)"
|
|
" LEFT JOIN state_events USING (event_id)"
|
|
" LEFT JOIN event_relations USING (event_id)"
|
|
" WHERE ? > stream_ordering AND stream_ordering >= ?"
|
|
" ORDER BY stream_ordering ASC"
|
|
" LIMIT ?"
|
|
)
|
|
txn.execute(sql, (-last_id, -current_id, limit))
|
|
new_event_updates = [(row[0], row[1:]) for row in txn]
|
|
|
|
limited = False
|
|
if len(new_event_updates) == limit:
|
|
upper_bound = new_event_updates[-1][0]
|
|
limited = True
|
|
else:
|
|
upper_bound = current_id
|
|
|
|
sql = (
|
|
"SELECT -event_stream_ordering, e.event_id, e.room_id, e.type,"
|
|
" state_key, redacts, relates_to_id"
|
|
" FROM events AS e"
|
|
" INNER JOIN ex_outlier_stream USING (event_id)"
|
|
" LEFT JOIN redactions USING (event_id)"
|
|
" LEFT JOIN state_events USING (event_id)"
|
|
" LEFT JOIN event_relations USING (event_id)"
|
|
" WHERE ? > event_stream_ordering"
|
|
" AND event_stream_ordering >= ?"
|
|
" ORDER BY event_stream_ordering DESC"
|
|
)
|
|
txn.execute(sql, (-last_id, -upper_bound))
|
|
new_event_updates.extend((row[0], row[1:]) for row in txn)
|
|
|
|
if len(new_event_updates) >= limit:
|
|
upper_bound = new_event_updates[-1][0]
|
|
limited = True
|
|
|
|
return new_event_updates, upper_bound, limited
|
|
|
|
return await self.db_pool.runInteraction(
|
|
"get_all_new_backfill_event_rows", get_all_new_backfill_event_rows
|
|
)
|
|
|
|
async def get_all_updated_current_state_deltas(
|
|
self, from_token: int, to_token: int, target_row_count: int
|
|
) -> Tuple[List[Tuple], int, bool]:
|
|
"""Fetch updates from current_state_delta_stream
|
|
|
|
Args:
|
|
from_token: The previous stream token. Updates from this stream id will
|
|
be excluded.
|
|
|
|
to_token: The current stream token (ie the upper limit). Updates up to this
|
|
stream id will be included (modulo the 'limit' param)
|
|
|
|
target_row_count: The number of rows to try to return. If more rows are
|
|
available, we will set 'limited' in the result. In the event of a large
|
|
batch, we may return more rows than this.
|
|
Returns:
|
|
A triplet `(updates, new_last_token, limited)`, where:
|
|
* `updates` is a list of database tuples.
|
|
* `new_last_token` is the new position in stream.
|
|
* `limited` is whether there are more updates to fetch.
|
|
"""
|
|
|
|
def get_all_updated_current_state_deltas_txn(txn):
|
|
sql = """
|
|
SELECT stream_id, room_id, type, state_key, event_id
|
|
FROM current_state_delta_stream
|
|
WHERE ? < stream_id AND stream_id <= ?
|
|
ORDER BY stream_id ASC LIMIT ?
|
|
"""
|
|
txn.execute(sql, (from_token, to_token, target_row_count))
|
|
return txn.fetchall()
|
|
|
|
def get_deltas_for_stream_id_txn(txn, stream_id):
|
|
sql = """
|
|
SELECT stream_id, room_id, type, state_key, event_id
|
|
FROM current_state_delta_stream
|
|
WHERE stream_id = ?
|
|
"""
|
|
txn.execute(sql, [stream_id])
|
|
return txn.fetchall()
|
|
|
|
# we need to make sure that, for every stream id in the results, we get *all*
|
|
# the rows with that stream id.
|
|
|
|
rows = await self.db_pool.runInteraction(
|
|
"get_all_updated_current_state_deltas",
|
|
get_all_updated_current_state_deltas_txn,
|
|
) # type: List[Tuple]
|
|
|
|
# if we've got fewer rows than the limit, we're good
|
|
if len(rows) < target_row_count:
|
|
return rows, to_token, False
|
|
|
|
# we hit the limit, so reduce the upper limit so that we exclude the stream id
|
|
# of the last row in the result.
|
|
assert rows[-1][0] <= to_token
|
|
to_token = rows[-1][0] - 1
|
|
|
|
# search backwards through the list for the point to truncate
|
|
for idx in range(len(rows) - 1, 0, -1):
|
|
if rows[idx - 1][0] <= to_token:
|
|
return rows[:idx], to_token, True
|
|
|
|
# bother. We didn't get a full set of changes for even a single
|
|
# stream id. let's run the query again, without a row limit, but for
|
|
# just one stream id.
|
|
to_token += 1
|
|
rows = await self.db_pool.runInteraction(
|
|
"get_deltas_for_stream_id", get_deltas_for_stream_id_txn, to_token
|
|
)
|
|
|
|
return rows, to_token, True
|
|
|
|
async def is_event_after(self, event_id1, event_id2):
|
|
"""Returns True if event_id1 is after event_id2 in the stream
|
|
"""
|
|
to_1, so_1 = await self.get_event_ordering(event_id1)
|
|
to_2, so_2 = await self.get_event_ordering(event_id2)
|
|
return (to_1, so_1) > (to_2, so_2)
|
|
|
|
@cached(max_entries=5000)
|
|
async def get_event_ordering(self, event_id):
|
|
res = await self.db_pool.simple_select_one(
|
|
table="events",
|
|
retcols=["topological_ordering", "stream_ordering"],
|
|
keyvalues={"event_id": event_id},
|
|
allow_none=True,
|
|
)
|
|
|
|
if not res:
|
|
raise SynapseError(404, "Could not find event %s" % (event_id,))
|
|
|
|
return (int(res["topological_ordering"]), int(res["stream_ordering"]))
|
|
|
|
def get_next_event_to_expire(self):
|
|
"""Retrieve the entry with the lowest expiry timestamp in the event_expiry
|
|
table, or None if there's no more event to expire.
|
|
|
|
Returns: Deferred[Optional[Tuple[str, int]]]
|
|
A tuple containing the event ID as its first element and an expiry timestamp
|
|
as its second one, if there's at least one row in the event_expiry table.
|
|
None otherwise.
|
|
"""
|
|
|
|
def get_next_event_to_expire_txn(txn):
|
|
txn.execute(
|
|
"""
|
|
SELECT event_id, expiry_ts FROM event_expiry
|
|
ORDER BY expiry_ts ASC LIMIT 1
|
|
"""
|
|
)
|
|
|
|
return txn.fetchone()
|
|
|
|
return self.db_pool.runInteraction(
|
|
desc="get_next_event_to_expire", func=get_next_event_to_expire_txn
|
|
)
|