mirror of
https://mau.dev/maunium/synapse.git
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8ad0f4912e
Handle the fact that events can be persisted out of order, and so to get the "current max" stream token becomes non trivial - as we need to make sure that *all* stream tokens less than the current max have also successfully been persisted.
396 lines
13 KiB
Python
396 lines
13 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
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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 synapse.crypto.event_signing import compute_event_reference_hash
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from syutil.base64util import decode_base64
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from syutil.jsonutil import encode_canonical_json
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import logging
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logger = logging.getLogger(__name__)
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class EventsStore(SQLBaseStore):
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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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try:
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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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stream_ordering=stream_ordering,
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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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@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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event = yield self.runInteraction(
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"get_event", self._get_event_txn,
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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 event and not allow_none:
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raise RuntimeError("Could not find event %s" % (event_id,))
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defer.returnValue(event)
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@log_function
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def _persist_event_txn(self, txn, event, context, backfilled,
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stream_ordering=None, is_new_state=True,
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current_state=None):
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# Remove the any existing cache entries for the event_id
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self._get_event_cache.pop(event.event_id)
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if stream_ordering is None:
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with self._stream_id_gen.get_next_txn(txn) as stream_ordering:
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return self._persist_event_txn(
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txn, event, context, backfilled,
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stream_ordering=stream_ordering,
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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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# 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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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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if event.is_state() and is_new_state:
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if not backfilled and not context.rejected:
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self._simple_insert_txn(
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txn,
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table="state_forward_extremities",
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values={
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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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)
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for prev_state_id, _ in event.prev_state:
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self._simple_delete_txn(
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txn,
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table="state_forward_extremities",
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keyvalues={
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"event_id": prev_state_id,
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}
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)
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outlier = event.internal_metadata.is_outlier()
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if not outlier:
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self._store_state_groups_txn(txn, event, context)
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self._update_min_depth_for_room_txn(
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txn,
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event.room_id,
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event.depth
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)
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have_persisted = self._simple_select_one_onecol_txn(
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txn,
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table="event_json",
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keyvalues={"event_id": event.event_id},
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retcol="event_id",
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allow_none=True,
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)
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metadata_json = encode_canonical_json(
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event.internal_metadata.get_dict()
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)
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# If we have already persisted this event, we don't need to do any
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# more processing.
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# The processing above must be done on every call to persist event,
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# since they might not have happened on previous calls. For example,
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# if we are persisting an event that we had persisted as an outlier,
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# but is no longer one.
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if have_persisted:
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if not outlier:
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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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(buffer(metadata_json), event.event_id,)
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)
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sql = (
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"UPDATE events SET outlier = 0"
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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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(event.event_id,)
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)
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return
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self._handle_prev_events(
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txn,
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outlier=outlier,
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event_id=event.event_id,
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prev_events=event.prev_events,
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room_id=event.room_id,
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)
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if event.type == EventTypes.Member:
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self._store_room_member_txn(txn, event)
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elif 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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event_dict = {
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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_txn(
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txn,
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table="event_json",
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values={
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"event_id": event.event_id,
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"room_id": event.room_id,
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"internal_metadata": buffer(metadata_json),
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"json": buffer(encode_canonical_json(event_dict)),
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},
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)
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content = buffer(encode_canonical_json(
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event.content
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))
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vals = {
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"topological_ordering": event.depth,
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"event_id": event.event_id,
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"type": event.type,
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"room_id": event.room_id,
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"content": content,
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"processed": True,
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"outlier": outlier,
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"depth": event.depth,
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}
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unrec = {
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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 vals.keys() and k not in [
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"redacted",
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"redacted_because",
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"signatures",
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"hashes",
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"prev_events",
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]
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}
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vals["unrecognized_keys"] = buffer(encode_canonical_json(
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unrec
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))
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sql = (
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"INSERT INTO events"
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" (stream_ordering, topological_ordering, event_id, type,"
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" room_id, content, processed, outlier, depth)"
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" VALUES (%s,?,?,?,?,?,?,?,?)"
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) % (stream_ordering,)
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txn.execute(
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sql,
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(event.depth, event.event_id, event.type, event.room_id,
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content, True, outlier, event.depth)
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)
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if context.rejected:
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self._store_rejections_txn(txn, event.event_id, context.rejected)
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if event.is_state():
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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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self._simple_insert_txn(
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txn,
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"state_events",
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vals,
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)
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if is_new_state and not context.rejected:
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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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for e_id, h in event.prev_state:
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self._simple_insert_txn(
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txn,
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table="event_edges",
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values={
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"event_id": event.event_id,
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"prev_event_id": e_id,
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"room_id": event.room_id,
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"is_state": 1,
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},
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)
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for hash_alg, hash_base64 in event.hashes.items():
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hash_bytes = decode_base64(hash_base64)
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self._store_event_content_hash_txn(
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txn, event.event_id, hash_alg, hash_bytes,
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)
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for prev_event_id, prev_hashes in event.prev_events:
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for alg, hash_base64 in prev_hashes.items():
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hash_bytes = decode_base64(hash_base64)
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self._store_prev_event_hash_txn(
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txn, event.event_id, prev_event_id, alg, hash_bytes
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)
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for auth_id, _ in event.auth_events:
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self._simple_insert_txn(
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txn,
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table="event_auth",
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values={
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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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)
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(ref_alg, ref_hash_bytes) = compute_event_reference_hash(event)
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self._store_event_reference_hash_txn(
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txn, event.event_id, ref_alg, ref_hash_bytes
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)
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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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self._get_event_cache.pop(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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