mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-26 04:05:38 +00:00
![Erik Johnston](/assets/img/avatar_default.png)
Currently we only have the one event format version defined, but this adds the necessary infrastructure to persist and fetch the format versions alongside the events. We specify the format version rather than the room version as: 1. We don't necessarily know the room version, existing events may be either v1 or v2. 2. We'd need to be careful to prevent/handle correctly if different events in the same room reported to be of different versions, which sounds annoying.
540 lines
19 KiB
Python
540 lines
19 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 EventFormatVersions
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from synapse.api.errors import NotFoundError
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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 import FrozenEvent
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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.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={
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"event_id": event_id,
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},
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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(self, event_id, check_redacted=True,
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get_prev_content=False, allow_rejected=False,
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allow_none=False, check_room_id=None):
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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(self, event_ids, check_redacted=True,
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get_prev_content=False, allow_rejected=False):
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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(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_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,
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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_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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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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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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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,
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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 = [
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item for sublist in event_id_lists for item in sublist
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]
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rows = self._new_transaction(
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conn, "do_fetch", [], [],
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self._fetch_event_rows, event_ids,
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)
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row_dict = {
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r["event_id"]: r
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for r in rows
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}
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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([
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res[i]
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for i in ids
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if i in res
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])
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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, check_redacted=True, 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(
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(events, events_d)
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)
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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",
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self.runWithConnection,
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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(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"], row["json"], 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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defer.returnValue({
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e.event.event_id: e
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for e in res if e
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})
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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(self, internal_metadata, js, redacted,
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format_version, rejected_reason=None):
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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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# TODO: When we implement new event formats we'll need to use a
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# different event python type
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assert format_version == EventFormatVersions.V1
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original_ev = FrozenEvent(
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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,
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check_redacted=False,
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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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cache_entry = _EventCacheEntry(
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event=original_ev,
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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(
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table="events",
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retcols=("event_id",),
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column="event_id",
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iterable=list(event_ids),
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keyvalues={"outlier": False},
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desc="have_events_in_timeline",
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)
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defer.returnValue(set(r["event_id"] for r in rows))
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@defer.inlineCallbacks
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def have_seen_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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Args:
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event_ids (iterable[str]):
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Returns:
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Deferred[set[str]]: The events we have already seen.
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"""
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results = set()
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def have_seen_events_txn(txn, chunk):
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sql = (
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"SELECT event_id FROM events as e WHERE e.event_id IN (%s)"
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% (",".join("?" * len(chunk)), )
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)
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txn.execute(sql, chunk)
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for (event_id, ) in txn:
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results.add(event_id)
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# break the input up into chunks of 100
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input_iterator = iter(event_ids)
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for chunk in iter(lambda: list(itertools.islice(input_iterator, 100)),
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[]):
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yield self.runInteraction(
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"have_seen_events",
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have_seen_events_txn,
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chunk,
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)
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defer.returnValue(results)
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def get_seen_events_with_rejections(self, event_ids):
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"""Given a list of event ids, check if we rejected them.
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Args:
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event_ids (list[str])
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Returns:
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Deferred[dict[str, str|None):
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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
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to 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
|
|
|
|
return res
|
|
|
|
return self.runInteraction("get_rejection_reasons", f)
|