437 lines
15 KiB
Python
437 lines
15 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 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.errors import SynapseError
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# these are only included to make the type annotations work
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from synapse.events import EventBase # noqa: F401
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from synapse.events import FrozenEvent
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from synapse.events.snapshot import EventContext # noqa: F401
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from synapse.events.utils import prune_event
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.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):
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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 SynapseError(404, "Could not find event %s" % (event_id,))
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defer.returnValue(events[0] if events else None)
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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 = 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):
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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(e)
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with PreserveLoggingContext():
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self.hs.get_reactor().callFromThread(fire, event_list)
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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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)
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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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" 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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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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original_ev = FrozenEvent(
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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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