594 lines
22 KiB
Python
594 lines
22 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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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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# these are only included to make the type annotations work
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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.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.logcontext import (
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LoggingContext,
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PreserveLoggingContext,
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make_deferred_yieldable,
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run_in_background,
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)
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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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@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 : A FrozenEvent.
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"""
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events = yield self._get_events(
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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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defer.returnValue(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(
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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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defer.returnValue({e.event_id: e for e in events})
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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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if not event_ids:
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defer.returnValue([])
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event_id_list = event_ids
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event_ids = set(event_ids)
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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 _enqueue_events 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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# _enqueue_events is a bit of a rubbish name but naming is hard.
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missing_events = yield self._enqueue_events(
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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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events = []
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for event_id in event_id_list:
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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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# Starting in room version v3, some redactions need to be rechecked if we
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# didn't have the redacted event at the time, so we recheck on read
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# instead.
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if not allow_rejected and entry.event.type == EventTypes.Redaction:
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if entry.event.internal_metadata.need_to_check_redaction():
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# XXX: we need to avoid calling get_event here.
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#
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# The problem is that we end up at this point when an event
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# which has been redacted is pulled out of the database by
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# _enqueue_events, because _enqueue_events needs to check the
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# redaction before it can cache the redacted event. So obviously,
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# calling get_event to get the redacted event out of the database
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# gives us an infinite loop.
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#
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# For now (quick hack to fix during 0.99 release cycle), we just
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# go and fetch the relevant row from the db, but it would be nice
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# to think about how we can cache this rather than hit the db
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# every time we access a redaction event.
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#
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# One thought on how to do this:
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# 1. split _get_events up so that it is divided into (a) get the
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# rawish event from the db/cache, (b) do the redaction/rejection
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# filtering
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# 2. have _get_event_from_row just call the first half of that
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orig_sender = yield self._simple_select_one_onecol(
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table="events",
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keyvalues={"event_id": entry.event.redacts},
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retcol="sender",
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allow_none=True,
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)
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expected_domain = get_domain_from_id(entry.event.sender)
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if (
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orig_sender
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and get_domain_from_id(orig_sender) == expected_domain
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):
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# This redaction event is allowed. Mark as not needing a
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# recheck.
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entry.event.internal_metadata.recheck_redaction = False
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else:
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# We don't have the event that is being redacted, so we
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# assume that the event isn't authorized for now. (If we
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# later receive the event, then we will always redact
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# it anyway, since we have this redaction)
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continue
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if allow_rejected or not entry.event.rejected_reason:
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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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defer.returnValue(events)
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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 (list(str)): list of event_ids to fetch
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allow_rejected (bool): Whether to teturn 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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"""
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with Measure(self._clock, "_fetch_event_list"):
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try:
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event_id_lists = list(zip(*event_list))[0]
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event_ids = [item for sublist in event_id_lists for item in sublist]
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rows = self._new_transaction(
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conn, "do_fetch", [], [], self._fetch_event_rows, event_ids
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)
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row_dict = {r["event_id"]: r for r in rows}
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# We only want to resolve deferreds from the main thread
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def fire(lst, res):
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for ids, d in lst:
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if not d.called:
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try:
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with PreserveLoggingContext():
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d.callback([res[i] for i in ids if i in res])
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except Exception:
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logger.exception("Failed to callback")
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with PreserveLoggingContext():
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self.hs.get_reactor().callFromThread(fire, event_list, row_dict)
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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 _enqueue_events(self, events, allow_rejected=False):
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"""Fetches events from the database using the _event_fetch_list. This
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allows batch and bulk fetching of events - it allows us to fetch events
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without having to create a new transaction for each request for events.
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"""
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if not events:
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defer.returnValue({})
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events_d = defer.Deferred()
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with self._event_fetch_lock:
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self._event_fetch_list.append((events, events_d))
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self._event_fetch_lock.notify()
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if self._event_fetch_ongoing < EVENT_QUEUE_THREADS:
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self._event_fetch_ongoing += 1
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should_start = True
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else:
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should_start = False
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if should_start:
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run_as_background_process(
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"fetch_events", self.runWithConnection, self._do_fetch
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)
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logger.debug("Loading %d events", len(events))
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with PreserveLoggingContext():
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rows = yield events_d
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logger.debug("Loaded %d events (%d rows)", len(events), len(rows))
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if not allow_rejected:
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rows[:] = [r for r in rows if not r["rejects"]]
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res = yield make_deferred_yieldable(
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defer.gatherResults(
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[
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run_in_background(
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self._get_event_from_row,
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row["internal_metadata"],
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row["json"],
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row["redacts"],
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rejected_reason=row["rejects"],
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format_version=row["format_version"],
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)
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for row in rows
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],
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consumeErrors=True,
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)
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)
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defer.returnValue({e.event.event_id: e for e in res if e})
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def _fetch_event_rows(self, txn, events):
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rows = []
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N = 200
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for i in range(1 + len(events) // N):
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evs = events[i * N : (i + 1) * N]
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if not evs:
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break
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sql = (
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"SELECT "
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" e.event_id as event_id, "
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" e.internal_metadata,"
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" e.json,"
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" e.format_version, "
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" r.redacts as redacts,"
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" rej.event_id as rejects "
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" FROM event_json as e"
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" LEFT JOIN rejections as rej USING (event_id)"
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" LEFT JOIN redactions as r ON e.event_id = r.redacts"
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" WHERE e.event_id IN (%s)"
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) % (",".join(["?"] * len(evs)),)
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txn.execute(sql, evs)
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rows.extend(self.cursor_to_dict(txn))
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return rows
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@defer.inlineCallbacks
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def _get_event_from_row(
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self, internal_metadata, js, redacted, format_version, rejected_reason=None
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):
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with Measure(self._clock, "_get_event_from_row"):
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d = json.loads(js)
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internal_metadata = json.loads(internal_metadata)
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if rejected_reason:
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rejected_reason = yield self._simple_select_one_onecol(
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table="rejections",
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keyvalues={"event_id": rejected_reason},
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retcol="reason",
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desc="_get_event_from_row_rejected_reason",
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)
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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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redacted_event = None
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if redacted:
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redacted_event = prune_event(original_ev)
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redaction_id = yield self._simple_select_one_onecol(
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table="redactions",
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keyvalues={"redacts": redacted_event.event_id},
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retcol="event_id",
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desc="_get_event_from_row_redactions",
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)
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redacted_event.unsigned["redacted_by"] = redaction_id
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# Get the redaction event.
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because = yield self.get_event(
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redaction_id, check_redacted=False, allow_none=True
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)
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if because:
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# It's fine to do add the event directly, since get_pdu_json
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# will serialise this field correctly
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redacted_event.unsigned["redacted_because"] = because
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# Starting in room version v3, some redactions need to be
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# rechecked if we didn't have the redacted event at the
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# time, so we recheck on read instead.
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if because.internal_metadata.need_to_check_redaction():
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expected_domain = get_domain_from_id(original_ev.sender)
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if get_domain_from_id(because.sender) == expected_domain:
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# This redaction event is allowed. Mark as not needing a
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# recheck.
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because.internal_metadata.recheck_redaction = False
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else:
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# Senders don't match, so the event isn't actually redacted
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redacted_event = None
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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((original_ev.event_id,), cache_entry)
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defer.returnValue(cache_entry)
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@defer.inlineCallbacks
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def have_events_in_timeline(self, event_ids):
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"""Given a list of event ids, check if we have already processed and
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stored them as non outliers.
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"""
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|
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",
|
|
)
|
|
|
|
defer.returnValue(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)
|
|
defer.returnValue(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_rejection_reasons", f)
|