902 lines
30 KiB
Python
902 lines
30 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket 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 _base import SQLBaseStore, _RollbackButIsFineException
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from twisted.internet import defer, reactor
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from synapse.events import FrozenEvent, USE_FROZEN_DICTS
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from synapse.events.utils import prune_event
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from synapse.util.logcontext import preserve_context_over_deferred
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from synapse.util.logutils import log_function
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from synapse.api.constants import EventTypes
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from syutil.jsonutil import encode_json
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from contextlib import contextmanager
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import logging
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import ujson as json
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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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class EventsStore(SQLBaseStore):
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@defer.inlineCallbacks
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def persist_events(self, events_and_contexts, backfilled=False,
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is_new_state=True):
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if not events_and_contexts:
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return
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if backfilled:
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if not self.min_token_deferred.called:
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yield self.min_token_deferred
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start = self.min_token - 1
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self.min_token -= len(events_and_contexts) + 1
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stream_orderings = range(start, self.min_token, -1)
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@contextmanager
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def stream_ordering_manager():
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yield stream_orderings
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stream_ordering_manager = stream_ordering_manager()
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else:
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stream_ordering_manager = yield self._stream_id_gen.get_next_mult(
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self, len(events_and_contexts)
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)
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with stream_ordering_manager as stream_orderings:
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for (event, _), stream in zip(events_and_contexts, stream_orderings):
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event.internal_metadata.stream_ordering = stream
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chunks = [
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events_and_contexts[x:x+100]
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for x in xrange(0, len(events_and_contexts), 100)
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]
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for chunk in chunks:
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# We can't easily parallelize these since different chunks
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# might contain the same event. :(
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yield self.runInteraction(
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"persist_events",
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self._persist_events_txn,
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events_and_contexts=chunk,
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backfilled=backfilled,
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is_new_state=is_new_state,
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)
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@defer.inlineCallbacks
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@log_function
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def persist_event(self, event, context, backfilled=False,
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is_new_state=True, current_state=None):
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stream_ordering = None
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if backfilled:
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if not self.min_token_deferred.called:
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yield self.min_token_deferred
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self.min_token -= 1
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stream_ordering = self.min_token
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if stream_ordering is None:
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stream_ordering_manager = yield self._stream_id_gen.get_next(self)
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else:
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@contextmanager
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def stream_ordering_manager():
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yield stream_ordering
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stream_ordering_manager = stream_ordering_manager()
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try:
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with stream_ordering_manager as stream_ordering:
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event.internal_metadata.stream_ordering = stream_ordering
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yield self.runInteraction(
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"persist_event",
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self._persist_event_txn,
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event=event,
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context=context,
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backfilled=backfilled,
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is_new_state=is_new_state,
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current_state=current_state,
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)
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except _RollbackButIsFineException:
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pass
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max_persisted_id = yield self._stream_id_gen.get_max_token(self)
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defer.returnValue((stream_ordering, max_persisted_id))
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@defer.inlineCallbacks
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def get_event(self, event_id, check_redacted=True,
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get_prev_content=False, allow_rejected=False,
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allow_none=False):
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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 an exception.
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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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if not events and not allow_none:
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raise RuntimeError("Could not find event %s" % (event_id,))
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defer.returnValue(events[0] if events else None)
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@log_function
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def _persist_event_txn(self, txn, event, context, backfilled,
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is_new_state=True, current_state=None):
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# We purposefully do this first since if we include a `current_state`
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# key, we *want* to update the `current_state_events` table
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if current_state:
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txn.call_after(self.get_current_state_for_key.invalidate_all)
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txn.call_after(self.get_rooms_for_user.invalidate_all)
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txn.call_after(self.get_users_in_room.invalidate, event.room_id)
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txn.call_after(self.get_joined_hosts_for_room.invalidate, event.room_id)
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txn.call_after(self.get_room_name_and_aliases, event.room_id)
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self._simple_delete_txn(
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txn,
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table="current_state_events",
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keyvalues={"room_id": event.room_id},
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)
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for s in current_state:
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self._simple_insert_txn(
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txn,
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"current_state_events",
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{
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"event_id": s.event_id,
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"room_id": s.room_id,
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"type": s.type,
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"state_key": s.state_key,
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}
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)
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return self._persist_events_txn(
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txn,
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[(event, context)],
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backfilled=backfilled,
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is_new_state=is_new_state,
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)
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@log_function
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def _persist_events_txn(self, txn, events_and_contexts, backfilled,
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is_new_state=True):
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# Remove the any existing cache entries for the event_ids
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for event, _ in events_and_contexts:
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txn.call_after(self._invalidate_get_event_cache, event.event_id)
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depth_updates = {}
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for event, _ in events_and_contexts:
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if event.internal_metadata.is_outlier():
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continue
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depth_updates[event.room_id] = max(
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event.depth, depth_updates.get(event.room_id, event.depth)
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)
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for room_id, depth in depth_updates.items():
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self._update_min_depth_for_room_txn(txn, room_id, depth)
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txn.execute(
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"SELECT event_id, outlier FROM events WHERE event_id in (%s)" % (
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",".join(["?"] * len(events_and_contexts)),
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),
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[event.event_id for event, _ in events_and_contexts]
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)
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have_persisted = {
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event_id: outlier
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for event_id, outlier in txn.fetchall()
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}
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event_map = {}
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to_remove = set()
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for event, context in events_and_contexts:
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# Handle the case of the list including the same event multiple
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# times. The tricky thing here is when they differ by whether
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# they are an outlier.
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if event.event_id in event_map:
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other = event_map[event.event_id]
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if not other.internal_metadata.is_outlier():
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to_remove.add(event)
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continue
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elif not event.internal_metadata.is_outlier():
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to_remove.add(event)
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continue
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else:
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to_remove.add(other)
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event_map[event.event_id] = event
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if event.event_id not in have_persisted:
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continue
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to_remove.add(event)
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outlier_persisted = have_persisted[event.event_id]
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if not event.internal_metadata.is_outlier() and outlier_persisted:
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self._store_state_groups_txn(
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txn, event, context,
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)
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metadata_json = encode_json(
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event.internal_metadata.get_dict(),
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using_frozen_dicts=USE_FROZEN_DICTS
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).decode("UTF-8")
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sql = (
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"UPDATE event_json SET internal_metadata = ?"
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" WHERE event_id = ?"
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)
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txn.execute(
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sql,
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(metadata_json, event.event_id,)
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)
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sql = (
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"UPDATE events SET outlier = ?"
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" WHERE event_id = ?"
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)
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txn.execute(
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sql,
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(False, event.event_id,)
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)
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events_and_contexts = filter(
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lambda ec: ec[0] not in to_remove,
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events_and_contexts
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)
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if not events_and_contexts:
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return
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self._store_mult_state_groups_txn(txn, [
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(event, context)
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for event, context in events_and_contexts
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if not event.internal_metadata.is_outlier()
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])
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self._handle_mult_prev_events(
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txn,
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events=[event for event, _ in events_and_contexts],
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)
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for event, _ in events_and_contexts:
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if event.type == EventTypes.Name:
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self._store_room_name_txn(txn, event)
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elif event.type == EventTypes.Topic:
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self._store_room_topic_txn(txn, event)
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elif event.type == EventTypes.Redaction:
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self._store_redaction(txn, event)
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self._store_room_members_txn(
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txn,
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[
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event
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for event, _ in events_and_contexts
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if event.type == EventTypes.Member
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]
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)
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def event_dict(event):
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return {
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k: v
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for k, v in event.get_dict().items()
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if k not in [
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"redacted",
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"redacted_because",
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]
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}
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self._simple_insert_many_txn(
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txn,
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table="event_json",
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values=[
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{
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"event_id": event.event_id,
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"room_id": event.room_id,
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"internal_metadata": encode_json(
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event.internal_metadata.get_dict(),
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using_frozen_dicts=USE_FROZEN_DICTS
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).decode("UTF-8"),
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"json": encode_json(
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event_dict(event), using_frozen_dicts=USE_FROZEN_DICTS
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).decode("UTF-8"),
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}
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for event, _ in events_and_contexts
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],
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)
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self._simple_insert_many_txn(
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txn,
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table="events",
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values=[
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{
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"stream_ordering": event.internal_metadata.stream_ordering,
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"topological_ordering": event.depth,
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"depth": event.depth,
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"event_id": event.event_id,
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"room_id": event.room_id,
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"type": event.type,
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"processed": True,
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"outlier": event.internal_metadata.is_outlier(),
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"content": encode_json(
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event.content, using_frozen_dicts=USE_FROZEN_DICTS
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).decode("UTF-8"),
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}
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for event, _ in events_and_contexts
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],
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)
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if context.rejected:
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self._store_rejections_txn(
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txn, event.event_id, context.rejected
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)
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self._simple_insert_many_txn(
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txn,
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table="event_auth",
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values=[
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{
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"event_id": event.event_id,
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"room_id": event.room_id,
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"auth_id": auth_id,
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}
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for event, _ in events_and_contexts
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for auth_id, _ in event.auth_events
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],
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)
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self._store_event_reference_hashes_txn(
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txn, [event for event, _ in events_and_contexts]
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)
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state_events_and_contexts = filter(
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lambda i: i[0].is_state(),
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events_and_contexts,
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)
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state_values = []
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for event, context in state_events_and_contexts:
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vals = {
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"event_id": event.event_id,
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"room_id": event.room_id,
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"type": event.type,
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"state_key": event.state_key,
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}
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# TODO: How does this work with backfilling?
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if hasattr(event, "replaces_state"):
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vals["prev_state"] = event.replaces_state
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state_values.append(vals)
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self._simple_insert_many_txn(
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txn,
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table="state_events",
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values=state_values,
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)
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self._simple_insert_many_txn(
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txn,
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table="event_edges",
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values=[
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{
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"event_id": event.event_id,
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"prev_event_id": prev_id,
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"room_id": event.room_id,
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"is_state": True,
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}
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for event, _ in state_events_and_contexts
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for prev_id, _ in event.prev_state
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],
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)
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if is_new_state:
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for event, _ in state_events_and_contexts:
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if not context.rejected:
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txn.call_after(
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self.get_current_state_for_key.invalidate,
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event.room_id, event.type, event.state_key
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)
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if event.type in [EventTypes.Name, EventTypes.Aliases]:
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txn.call_after(
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self.get_room_name_and_aliases.invalidate,
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event.room_id
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)
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self._simple_upsert_txn(
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txn,
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"current_state_events",
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keyvalues={
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"room_id": event.room_id,
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"type": event.type,
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"state_key": event.state_key,
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},
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values={
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"event_id": event.event_id,
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}
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)
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return
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def _store_redaction(self, txn, event):
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# invalidate the cache for the redacted event
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txn.call_after(self._invalidate_get_event_cache, event.redacts)
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txn.execute(
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"INSERT INTO redactions (event_id, redacts) VALUES (?,?)",
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(event.event_id, event.redacts)
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)
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def have_events(self, event_ids):
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"""Given a list of event ids, check if we have already processed them.
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Returns:
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dict: Has an entry for each event id we already have seen. Maps to
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the rejected reason string if we rejected the event, else maps to
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None.
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"""
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if not event_ids:
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return defer.succeed({})
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def f(txn):
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sql = (
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"SELECT e.event_id, reason FROM events as e "
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"LEFT JOIN rejections as r ON e.event_id = r.event_id "
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"WHERE e.event_id = ?"
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)
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res = {}
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for event_id in event_ids:
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txn.execute(sql, (event_id,))
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row = txn.fetchone()
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if row:
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_, rejected = row
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res[event_id] = rejected
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return res
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return self.runInteraction(
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"have_events", f,
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)
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@defer.inlineCallbacks
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def _get_events(self, event_ids, check_redacted=True,
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get_prev_content=False, allow_rejected=False):
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if not event_ids:
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defer.returnValue([])
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event_map = self._get_events_from_cache(
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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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missing_events_ids = [e for e in event_ids if e not in event_map]
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if not missing_events_ids:
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defer.returnValue([
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event_map[e_id] for e_id in event_ids
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if e_id in event_map and event_map[e_id]
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])
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missing_events = yield self._enqueue_events(
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missing_events_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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event_map.update(missing_events)
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defer.returnValue([
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event_map[e_id] for e_id in event_ids
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if e_id in event_map and event_map[e_id]
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])
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def _get_events_txn(self, txn, event_ids, check_redacted=True,
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get_prev_content=False, allow_rejected=False):
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if not event_ids:
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return []
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event_map = self._get_events_from_cache(
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event_ids,
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check_redacted=check_redacted,
|
|
get_prev_content=get_prev_content,
|
|
allow_rejected=allow_rejected,
|
|
)
|
|
|
|
missing_events_ids = [e for e in event_ids if e not in event_map]
|
|
|
|
if not missing_events_ids:
|
|
return [
|
|
event_map[e_id] for e_id in event_ids
|
|
if e_id in event_map and event_map[e_id]
|
|
]
|
|
|
|
missing_events = self._fetch_events_txn(
|
|
txn,
|
|
missing_events_ids,
|
|
check_redacted=check_redacted,
|
|
get_prev_content=get_prev_content,
|
|
allow_rejected=allow_rejected,
|
|
)
|
|
|
|
event_map.update(missing_events)
|
|
|
|
return [
|
|
event_map[e_id] for e_id in event_ids
|
|
if e_id in event_map and event_map[e_id]
|
|
]
|
|
|
|
def _invalidate_get_event_cache(self, event_id):
|
|
for check_redacted in (False, True):
|
|
for get_prev_content in (False, True):
|
|
self._get_event_cache.invalidate(event_id, check_redacted,
|
|
get_prev_content)
|
|
|
|
def _get_event_txn(self, txn, event_id, check_redacted=True,
|
|
get_prev_content=False, allow_rejected=False):
|
|
|
|
events = self._get_events_txn(
|
|
txn, [event_id],
|
|
check_redacted=check_redacted,
|
|
get_prev_content=get_prev_content,
|
|
allow_rejected=allow_rejected,
|
|
)
|
|
|
|
return events[0] if events else None
|
|
|
|
def _get_events_from_cache(self, events, check_redacted, get_prev_content,
|
|
allow_rejected):
|
|
event_map = {}
|
|
|
|
for event_id in events:
|
|
try:
|
|
ret = self._get_event_cache.get(
|
|
event_id, check_redacted, get_prev_content
|
|
)
|
|
|
|
if allow_rejected or not ret.rejected_reason:
|
|
event_map[event_id] = ret
|
|
else:
|
|
event_map[event_id] = None
|
|
except KeyError:
|
|
pass
|
|
|
|
return event_map
|
|
|
|
def _do_fetch(self, conn):
|
|
"""Takes a database connection and waits for requests for events from
|
|
the _event_fetch_list queue.
|
|
"""
|
|
event_list = []
|
|
i = 0
|
|
while True:
|
|
try:
|
|
with self._event_fetch_lock:
|
|
event_list = self._event_fetch_list
|
|
self._event_fetch_list = []
|
|
|
|
if not event_list:
|
|
single_threaded = self.database_engine.single_threaded
|
|
if single_threaded or i > EVENT_QUEUE_ITERATIONS:
|
|
self._event_fetch_ongoing -= 1
|
|
return
|
|
else:
|
|
self._event_fetch_lock.wait(EVENT_QUEUE_TIMEOUT_S)
|
|
i += 1
|
|
continue
|
|
i = 0
|
|
|
|
event_id_lists = zip(*event_list)[0]
|
|
event_ids = [
|
|
item for sublist in event_id_lists for item in sublist
|
|
]
|
|
|
|
rows = self._new_transaction(
|
|
conn, "do_fetch", [], self._fetch_event_rows, event_ids
|
|
)
|
|
|
|
row_dict = {
|
|
r["event_id"]: r
|
|
for r in rows
|
|
}
|
|
|
|
# We only want to resolve deferreds from the main thread
|
|
def fire(lst, res):
|
|
for ids, d in lst:
|
|
if not d.called:
|
|
try:
|
|
d.callback([
|
|
res[i]
|
|
for i in ids
|
|
if i in res
|
|
])
|
|
except:
|
|
logger.exception("Failed to callback")
|
|
reactor.callFromThread(fire, event_list, row_dict)
|
|
except Exception as e:
|
|
logger.exception("do_fetch")
|
|
|
|
# We only want to resolve deferreds from the main thread
|
|
def fire(evs):
|
|
for _, d in evs:
|
|
if not d.called:
|
|
d.errback(e)
|
|
|
|
if event_list:
|
|
reactor.callFromThread(fire, event_list)
|
|
|
|
@defer.inlineCallbacks
|
|
def _enqueue_events(self, events, check_redacted=True,
|
|
get_prev_content=False, allow_rejected=False):
|
|
"""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.
|
|
"""
|
|
if not events:
|
|
defer.returnValue({})
|
|
|
|
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:
|
|
self.runWithConnection(
|
|
self._do_fetch
|
|
)
|
|
|
|
rows = yield preserve_context_over_deferred(events_d)
|
|
|
|
if not allow_rejected:
|
|
rows[:] = [r for r in rows if not r["rejects"]]
|
|
|
|
res = yield defer.gatherResults(
|
|
[
|
|
self._get_event_from_row(
|
|
row["internal_metadata"], row["json"], row["redacts"],
|
|
check_redacted=check_redacted,
|
|
get_prev_content=get_prev_content,
|
|
rejected_reason=row["rejects"],
|
|
)
|
|
for row in rows
|
|
],
|
|
consumeErrors=True
|
|
)
|
|
|
|
defer.returnValue({
|
|
e.event_id: e
|
|
for e in res if e
|
|
})
|
|
|
|
def _fetch_event_rows(self, txn, events):
|
|
rows = []
|
|
N = 200
|
|
for i in range(1 + len(events) / N):
|
|
evs = events[i*N:(i + 1)*N]
|
|
if not evs:
|
|
break
|
|
|
|
sql = (
|
|
"SELECT "
|
|
" e.event_id as event_id, "
|
|
" e.internal_metadata,"
|
|
" e.json,"
|
|
" r.redacts as redacts,"
|
|
" rej.event_id as rejects "
|
|
" FROM event_json as e"
|
|
" LEFT JOIN rejections as rej USING (event_id)"
|
|
" LEFT JOIN redactions as r ON e.event_id = r.redacts"
|
|
" WHERE e.event_id IN (%s)"
|
|
) % (",".join(["?"]*len(evs)),)
|
|
|
|
txn.execute(sql, evs)
|
|
rows.extend(self.cursor_to_dict(txn))
|
|
|
|
return rows
|
|
|
|
def _fetch_events_txn(self, txn, events, check_redacted=True,
|
|
get_prev_content=False, allow_rejected=False):
|
|
if not events:
|
|
return {}
|
|
|
|
rows = self._fetch_event_rows(
|
|
txn, events,
|
|
)
|
|
|
|
if not allow_rejected:
|
|
rows[:] = [r for r in rows if not r["rejects"]]
|
|
|
|
res = [
|
|
self._get_event_from_row_txn(
|
|
txn,
|
|
row["internal_metadata"], row["json"], row["redacts"],
|
|
check_redacted=check_redacted,
|
|
get_prev_content=get_prev_content,
|
|
rejected_reason=row["rejects"],
|
|
)
|
|
for row in rows
|
|
]
|
|
|
|
return {
|
|
r.event_id: r
|
|
for r in res
|
|
}
|
|
|
|
@defer.inlineCallbacks
|
|
def _get_event_from_row(self, internal_metadata, js, redacted,
|
|
check_redacted=True, get_prev_content=False,
|
|
rejected_reason=None):
|
|
d = json.loads(js)
|
|
internal_metadata = json.loads(internal_metadata)
|
|
|
|
if rejected_reason:
|
|
rejected_reason = yield self._simple_select_one_onecol(
|
|
table="rejections",
|
|
keyvalues={"event_id": rejected_reason},
|
|
retcol="reason",
|
|
desc="_get_event_from_row",
|
|
)
|
|
|
|
ev = FrozenEvent(
|
|
d,
|
|
internal_metadata_dict=internal_metadata,
|
|
rejected_reason=rejected_reason,
|
|
)
|
|
|
|
if check_redacted and redacted:
|
|
ev = prune_event(ev)
|
|
|
|
redaction_id = yield self._simple_select_one_onecol(
|
|
table="redactions",
|
|
keyvalues={"redacts": ev.event_id},
|
|
retcol="event_id",
|
|
desc="_get_event_from_row",
|
|
)
|
|
|
|
ev.unsigned["redacted_by"] = redaction_id
|
|
# Get the redaction event.
|
|
|
|
because = yield self.get_event(
|
|
redaction_id,
|
|
check_redacted=False,
|
|
allow_none=True,
|
|
)
|
|
|
|
if because:
|
|
ev.unsigned["redacted_because"] = because
|
|
|
|
if get_prev_content and "replaces_state" in ev.unsigned:
|
|
prev = yield self.get_event(
|
|
ev.unsigned["replaces_state"],
|
|
get_prev_content=False,
|
|
allow_none=True,
|
|
)
|
|
if prev:
|
|
ev.unsigned["prev_content"] = prev.get_dict()["content"]
|
|
|
|
self._get_event_cache.prefill(
|
|
ev.event_id, check_redacted, get_prev_content, ev
|
|
)
|
|
|
|
defer.returnValue(ev)
|
|
|
|
def _get_event_from_row_txn(self, txn, internal_metadata, js, redacted,
|
|
check_redacted=True, get_prev_content=False,
|
|
rejected_reason=None):
|
|
d = json.loads(js)
|
|
internal_metadata = json.loads(internal_metadata)
|
|
|
|
if rejected_reason:
|
|
rejected_reason = self._simple_select_one_onecol_txn(
|
|
txn,
|
|
table="rejections",
|
|
keyvalues={"event_id": rejected_reason},
|
|
retcol="reason",
|
|
)
|
|
|
|
ev = FrozenEvent(
|
|
d,
|
|
internal_metadata_dict=internal_metadata,
|
|
rejected_reason=rejected_reason,
|
|
)
|
|
|
|
if check_redacted and redacted:
|
|
ev = prune_event(ev)
|
|
|
|
redaction_id = self._simple_select_one_onecol_txn(
|
|
txn,
|
|
table="redactions",
|
|
keyvalues={"redacts": ev.event_id},
|
|
retcol="event_id",
|
|
)
|
|
|
|
ev.unsigned["redacted_by"] = redaction_id
|
|
# Get the redaction event.
|
|
|
|
because = self._get_event_txn(
|
|
txn,
|
|
redaction_id,
|
|
check_redacted=False
|
|
)
|
|
|
|
if because:
|
|
ev.unsigned["redacted_because"] = because
|
|
|
|
if get_prev_content and "replaces_state" in ev.unsigned:
|
|
prev = self._get_event_txn(
|
|
txn,
|
|
ev.unsigned["replaces_state"],
|
|
get_prev_content=False,
|
|
)
|
|
if prev:
|
|
ev.unsigned["prev_content"] = prev.get_dict()["content"]
|
|
|
|
self._get_event_cache.prefill(
|
|
ev.event_id, check_redacted, get_prev_content, ev
|
|
)
|
|
|
|
return ev
|
|
|
|
def _parse_events(self, rows):
|
|
return self.runInteraction(
|
|
"_parse_events", self._parse_events_txn, rows
|
|
)
|
|
|
|
def _parse_events_txn(self, txn, rows):
|
|
event_ids = [r["event_id"] for r in rows]
|
|
|
|
return self._get_events_txn(txn, event_ids)
|
|
|
|
def _has_been_redacted_txn(self, txn, event):
|
|
sql = "SELECT event_id FROM redactions WHERE redacts = ?"
|
|
txn.execute(sql, (event.event_id,))
|
|
result = txn.fetchone()
|
|
return result[0] if result else None
|