666 lines
23 KiB
Python
666 lines
23 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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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""" This module is responsible for getting events from the DB for pagination
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and event streaming.
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The order it returns events in depend on whether we are streaming forwards or
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are paginating backwards. We do this because we want to handle out of order
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messages nicely, while still returning them in the correct order when we
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paginate bacwards.
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This is implemented by keeping two ordering columns: stream_ordering and
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topological_ordering. Stream ordering is basically insertion/received order
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(except for events from backfill requests). The topological_ordering is a
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weak ordering of events based on the pdu graph.
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This means that we have to have two different types of tokens, depending on
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what sort order was used:
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- stream tokens are of the form: "s%d", which maps directly to the column
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- topological tokems: "t%d-%d", where the integers map to the topological
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and stream ordering columns respectively.
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"""
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from twisted.internet import defer
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from ._base import SQLBaseStore
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from synapse.util.caches.descriptors import cached
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from synapse.api.constants import EventTypes
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from synapse.types import RoomStreamToken
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from synapse.util.logcontext import preserve_fn
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import logging
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logger = logging.getLogger(__name__)
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MAX_STREAM_SIZE = 1000
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_STREAM_TOKEN = "stream"
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_TOPOLOGICAL_TOKEN = "topological"
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def lower_bound(token):
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if token.topological is None:
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return "(%d < %s)" % (token.stream, "stream_ordering")
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else:
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return "(%d < %s OR (%d = %s AND %d < %s))" % (
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token.topological, "topological_ordering",
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token.topological, "topological_ordering",
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token.stream, "stream_ordering",
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)
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def upper_bound(token):
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if token.topological is None:
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return "(%d >= %s)" % (token.stream, "stream_ordering")
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else:
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return "(%d > %s OR (%d = %s AND %d >= %s))" % (
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token.topological, "topological_ordering",
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token.topological, "topological_ordering",
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token.stream, "stream_ordering",
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)
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class StreamStore(SQLBaseStore):
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@defer.inlineCallbacks
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def get_appservice_room_stream(self, service, from_key, to_key, limit=0):
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# NB this lives here instead of appservice.py so we can reuse the
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# 'private' StreamToken class in this file.
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if limit:
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limit = max(limit, MAX_STREAM_SIZE)
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else:
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limit = MAX_STREAM_SIZE
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# From and to keys should be integers from ordering.
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from_id = RoomStreamToken.parse_stream_token(from_key)
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to_id = RoomStreamToken.parse_stream_token(to_key)
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if from_key == to_key:
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defer.returnValue(([], to_key))
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return
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# select all the events between from/to with a sensible limit
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sql = (
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"SELECT e.event_id, e.room_id, e.type, s.state_key, "
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"e.stream_ordering FROM events AS e "
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"LEFT JOIN state_events as s ON "
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"e.event_id = s.event_id "
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"WHERE e.stream_ordering > ? AND e.stream_ordering <= ? "
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"ORDER BY stream_ordering ASC LIMIT %(limit)d "
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) % {
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"limit": limit
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}
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def f(txn):
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# pull out all the events between the tokens
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txn.execute(sql, (from_id.stream, to_id.stream,))
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rows = self.cursor_to_dict(txn)
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# Logic:
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# - We want ALL events which match the AS room_id regex
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# - We want ALL events which match the rooms represented by the AS
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# room_alias regex
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# - We want ALL events for rooms that AS users have joined.
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# This is currently supported via get_app_service_rooms (which is
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# used for the Notifier listener rooms). We can't reasonably make a
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# SQL query for these room IDs, so we'll pull all the events between
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# from/to and filter in python.
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rooms_for_as = self._get_app_service_rooms_txn(txn, service)
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room_ids_for_as = [r.room_id for r in rooms_for_as]
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def app_service_interested(row):
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if row["room_id"] in room_ids_for_as:
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return True
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if row["type"] == EventTypes.Member:
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if service.is_interested_in_user(row.get("state_key")):
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return True
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return False
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ret = self._get_events_txn(
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txn,
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# apply the filter on the room id list
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[
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r["event_id"] for r in rows
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if app_service_interested(r)
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],
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get_prev_content=True
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)
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self._set_before_and_after(ret, rows)
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if rows:
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key = "s%d" % max(r["stream_ordering"] for r in rows)
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else:
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# Assume we didn't get anything because there was nothing to
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# get.
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key = to_key
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return ret, key
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results = yield self.runInteraction("get_appservice_room_stream", f)
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defer.returnValue(results)
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@defer.inlineCallbacks
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def get_room_events_stream_for_rooms(self, room_ids, from_key, to_key, limit=0,
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order='DESC'):
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from_id = RoomStreamToken.parse_stream_token(from_key).stream
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room_ids = yield self._events_stream_cache.get_entities_changed(
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room_ids, from_id
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)
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if not room_ids:
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defer.returnValue({})
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results = {}
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room_ids = list(room_ids)
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for rm_ids in (room_ids[i:i + 20] for i in xrange(0, len(room_ids), 20)):
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res = yield defer.gatherResults([
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preserve_fn(self.get_room_events_stream_for_room)(
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room_id, from_key, to_key, limit, order=order,
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)
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for room_id in rm_ids
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])
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results.update(dict(zip(rm_ids, res)))
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defer.returnValue(results)
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@defer.inlineCallbacks
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def get_room_events_stream_for_room(self, room_id, from_key, to_key, limit=0,
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order='DESC'):
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# Note: If from_key is None then we return in topological order. This
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# is because in that case we're using this as a "get the last few messages
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# in a room" function, rather than "get new messages since last sync"
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if from_key is not None:
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from_id = RoomStreamToken.parse_stream_token(from_key).stream
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else:
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from_id = None
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to_id = RoomStreamToken.parse_stream_token(to_key).stream
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if from_key == to_key:
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defer.returnValue(([], from_key))
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if from_id:
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has_changed = yield self._events_stream_cache.has_entity_changed(
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room_id, from_id
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)
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if not has_changed:
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defer.returnValue(([], from_key))
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def f(txn):
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if from_id is not None:
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sql = (
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"SELECT event_id, stream_ordering FROM events WHERE"
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" room_id = ?"
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" AND not outlier"
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" AND stream_ordering > ? AND stream_ordering <= ?"
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" ORDER BY stream_ordering %s LIMIT ?"
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) % (order,)
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txn.execute(sql, (room_id, from_id, to_id, limit))
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else:
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sql = (
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"SELECT event_id, stream_ordering FROM events WHERE"
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" room_id = ?"
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" AND not outlier"
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" AND stream_ordering <= ?"
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" ORDER BY topological_ordering %s, stream_ordering %s LIMIT ?"
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) % (order, order,)
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txn.execute(sql, (room_id, to_id, limit))
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rows = self.cursor_to_dict(txn)
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return rows
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rows = yield self.runInteraction("get_room_events_stream_for_room", f)
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ret = yield self._get_events(
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[r["event_id"] for r in rows],
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get_prev_content=True
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)
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self._set_before_and_after(ret, rows, topo_order=from_id is None)
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if order.lower() == "desc":
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ret.reverse()
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if rows:
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key = "s%d" % min(r["stream_ordering"] for r in rows)
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else:
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# Assume we didn't get anything because there was nothing to
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# get.
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key = from_key
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defer.returnValue((ret, key))
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@defer.inlineCallbacks
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def get_membership_changes_for_user(self, user_id, from_key, to_key):
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if from_key is not None:
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from_id = RoomStreamToken.parse_stream_token(from_key).stream
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else:
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from_id = None
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to_id = RoomStreamToken.parse_stream_token(to_key).stream
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if from_key == to_key:
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defer.returnValue([])
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if from_id:
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has_changed = self._membership_stream_cache.has_entity_changed(
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user_id, int(from_id)
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)
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if not has_changed:
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defer.returnValue([])
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def f(txn):
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if from_id is not None:
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sql = (
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"SELECT m.event_id, stream_ordering FROM events AS e,"
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" room_memberships AS m"
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" WHERE e.event_id = m.event_id"
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" AND m.user_id = ?"
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" AND e.stream_ordering > ? AND e.stream_ordering <= ?"
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" ORDER BY e.stream_ordering ASC"
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)
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txn.execute(sql, (user_id, from_id, to_id,))
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else:
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sql = (
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"SELECT m.event_id, stream_ordering FROM events AS e,"
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" room_memberships AS m"
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" WHERE e.event_id = m.event_id"
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" AND m.user_id = ?"
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" AND stream_ordering <= ?"
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" ORDER BY stream_ordering ASC"
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)
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txn.execute(sql, (user_id, to_id,))
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rows = self.cursor_to_dict(txn)
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return rows
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rows = yield self.runInteraction("get_membership_changes_for_user", f)
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ret = yield self._get_events(
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[r["event_id"] for r in rows],
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get_prev_content=True
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)
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self._set_before_and_after(ret, rows, topo_order=False)
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defer.returnValue(ret)
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@defer.inlineCallbacks
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def paginate_room_events(self, room_id, from_key, to_key=None,
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direction='b', limit=-1):
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# Tokens really represent positions between elements, but we use
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# the convention of pointing to the event before the gap. Hence
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# we have a bit of asymmetry when it comes to equalities.
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args = [False, room_id]
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if direction == 'b':
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order = "DESC"
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bounds = upper_bound(RoomStreamToken.parse(from_key))
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if to_key:
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bounds = "%s AND %s" % (
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bounds, lower_bound(RoomStreamToken.parse(to_key))
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)
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else:
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order = "ASC"
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bounds = lower_bound(RoomStreamToken.parse(from_key))
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if to_key:
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bounds = "%s AND %s" % (
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bounds, upper_bound(RoomStreamToken.parse(to_key))
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)
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if int(limit) > 0:
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args.append(int(limit))
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limit_str = " LIMIT ?"
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else:
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limit_str = ""
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sql = (
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"SELECT * FROM events"
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" WHERE outlier = ? AND room_id = ? AND %(bounds)s"
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" ORDER BY topological_ordering %(order)s,"
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" stream_ordering %(order)s %(limit)s"
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) % {
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"bounds": bounds,
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"order": order,
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"limit": limit_str
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}
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def f(txn):
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txn.execute(sql, args)
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rows = self.cursor_to_dict(txn)
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if rows:
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topo = rows[-1]["topological_ordering"]
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toke = rows[-1]["stream_ordering"]
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if direction == 'b':
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# Tokens are positions between events.
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# This token points *after* the last event in the chunk.
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# We need it to point to the event before it in the chunk
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# when we are going backwards so we subtract one from the
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# stream part.
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toke -= 1
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next_token = str(RoomStreamToken(topo, toke))
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else:
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# TODO (erikj): We should work out what to do here instead.
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next_token = to_key if to_key else from_key
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return rows, next_token,
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rows, token = yield self.runInteraction("paginate_room_events", f)
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events = yield self._get_events(
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[r["event_id"] for r in rows],
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get_prev_content=True
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)
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self._set_before_and_after(events, rows)
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defer.returnValue((events, token))
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@defer.inlineCallbacks
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def get_recent_events_for_room(self, room_id, limit, end_token, from_token=None):
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rows, token = yield self.get_recent_event_ids_for_room(
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room_id, limit, end_token, from_token
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)
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logger.debug("stream before")
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events = yield self._get_events(
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[r["event_id"] for r in rows],
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get_prev_content=True
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)
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logger.debug("stream after")
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self._set_before_and_after(events, rows)
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defer.returnValue((events, token))
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@cached(num_args=4)
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def get_recent_event_ids_for_room(self, room_id, limit, end_token, from_token=None):
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end_token = RoomStreamToken.parse_stream_token(end_token)
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if from_token is None:
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sql = (
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"SELECT stream_ordering, topological_ordering, event_id"
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" FROM events"
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" WHERE room_id = ? AND stream_ordering <= ? AND outlier = ?"
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" ORDER BY topological_ordering DESC, stream_ordering DESC"
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" LIMIT ?"
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)
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else:
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from_token = RoomStreamToken.parse_stream_token(from_token)
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sql = (
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"SELECT stream_ordering, topological_ordering, event_id"
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" FROM events"
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" WHERE room_id = ? AND stream_ordering > ?"
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" AND stream_ordering <= ? AND outlier = ?"
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" ORDER BY topological_ordering DESC, stream_ordering DESC"
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" LIMIT ?"
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)
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def get_recent_events_for_room_txn(txn):
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if from_token is None:
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txn.execute(sql, (room_id, end_token.stream, False, limit,))
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else:
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txn.execute(sql, (
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room_id, from_token.stream, end_token.stream, False, limit
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))
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rows = self.cursor_to_dict(txn)
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rows.reverse() # As we selected with reverse ordering
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if rows:
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# Tokens are positions between events.
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# This token points *after* the last event in the chunk.
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# We need it to point to the event before it in the chunk
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# since we are going backwards so we subtract one from the
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# stream part.
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topo = rows[0]["topological_ordering"]
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toke = rows[0]["stream_ordering"] - 1
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start_token = str(RoomStreamToken(topo, toke))
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token = (start_token, str(end_token))
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else:
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token = (str(end_token), str(end_token))
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return rows, token
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return self.runInteraction(
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"get_recent_events_for_room", get_recent_events_for_room_txn
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)
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@defer.inlineCallbacks
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def get_room_events_max_id(self, direction='f'):
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token = yield self._stream_id_gen.get_current_token()
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if direction != 'b':
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defer.returnValue("s%d" % (token,))
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else:
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topo = yield self.runInteraction(
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"_get_max_topological_txn", self._get_max_topological_txn
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)
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defer.returnValue("t%d-%d" % (topo, token))
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def get_stream_token_for_event(self, event_id):
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"""The stream token for an event
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Args:
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event_id(str): The id of the event to look up a stream token for.
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Raises:
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StoreError if the event wasn't in the database.
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Returns:
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A deferred "s%d" stream token.
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"""
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return self._simple_select_one_onecol(
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table="events",
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keyvalues={"event_id": event_id},
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retcol="stream_ordering",
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).addCallback(lambda row: "s%d" % (row,))
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def get_topological_token_for_event(self, event_id):
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"""The stream token for an event
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Args:
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event_id(str): The id of the event to look up a stream token for.
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Raises:
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StoreError if the event wasn't in the database.
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Returns:
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A deferred "t%d-%d" topological token.
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"""
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return self._simple_select_one(
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table="events",
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keyvalues={"event_id": event_id},
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retcols=("stream_ordering", "topological_ordering"),
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desc="get_topological_token_for_event",
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).addCallback(lambda row: "t%d-%d" % (
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row["topological_ordering"], row["stream_ordering"],)
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)
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def get_max_topological_token_for_stream_and_room(self, room_id, stream_key):
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sql = (
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"SELECT max(topological_ordering) FROM events"
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" WHERE room_id = ? AND stream_ordering < ?"
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)
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return self._execute(
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"get_max_topological_token_for_stream_and_room", None,
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sql, room_id, stream_key,
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).addCallback(
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lambda r: r[0][0] if r else 0
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)
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def _get_max_topological_txn(self, txn):
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txn.execute(
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"SELECT MAX(topological_ordering) FROM events"
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" WHERE outlier = ?",
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(False,)
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)
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rows = txn.fetchall()
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return rows[0][0] if rows else 0
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@staticmethod
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def _set_before_and_after(events, rows, topo_order=True):
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for event, row in zip(events, rows):
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stream = row["stream_ordering"]
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if topo_order:
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topo = event.depth
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else:
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topo = None
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internal = event.internal_metadata
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internal.before = str(RoomStreamToken(topo, stream - 1))
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internal.after = str(RoomStreamToken(topo, stream))
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internal.order = (
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int(topo) if topo else 0,
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int(stream),
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)
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@defer.inlineCallbacks
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def get_events_around(self, room_id, event_id, before_limit, after_limit):
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"""Retrieve events and pagination tokens around a given event in a
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room.
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Args:
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room_id (str)
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event_id (str)
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before_limit (int)
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after_limit (int)
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Returns:
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dict
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"""
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results = yield self.runInteraction(
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"get_events_around", self._get_events_around_txn,
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room_id, event_id, before_limit, after_limit
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)
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events_before = yield self._get_events(
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[e for e in results["before"]["event_ids"]],
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get_prev_content=True
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)
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events_after = yield self._get_events(
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[e for e in results["after"]["event_ids"]],
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get_prev_content=True
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)
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defer.returnValue({
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"events_before": events_before,
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"events_after": events_after,
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"start": results["before"]["token"],
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"end": results["after"]["token"],
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})
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|
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def _get_events_around_txn(self, txn, room_id, event_id, before_limit, after_limit):
|
|
"""Retrieves event_ids and pagination tokens around a given event in a
|
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room.
|
|
|
|
Args:
|
|
room_id (str)
|
|
event_id (str)
|
|
before_limit (int)
|
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after_limit (int)
|
|
|
|
Returns:
|
|
dict
|
|
"""
|
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|
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results = self._simple_select_one_txn(
|
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txn,
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"events",
|
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keyvalues={
|
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"event_id": event_id,
|
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"room_id": room_id,
|
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},
|
|
retcols=["stream_ordering", "topological_ordering"],
|
|
)
|
|
|
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stream_ordering = results["stream_ordering"]
|
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topological_ordering = results["topological_ordering"]
|
|
|
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query_before = (
|
|
"SELECT topological_ordering, stream_ordering, event_id FROM events"
|
|
" WHERE room_id = ? AND (topological_ordering < ?"
|
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" OR (topological_ordering = ? AND stream_ordering < ?))"
|
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" ORDER BY topological_ordering DESC, stream_ordering DESC"
|
|
" LIMIT ?"
|
|
)
|
|
|
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query_after = (
|
|
"SELECT topological_ordering, stream_ordering, event_id FROM events"
|
|
" WHERE room_id = ? AND (topological_ordering > ?"
|
|
" OR (topological_ordering = ? AND stream_ordering > ?))"
|
|
" ORDER BY topological_ordering ASC, stream_ordering ASC"
|
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" LIMIT ?"
|
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)
|
|
|
|
txn.execute(
|
|
query_before,
|
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(
|
|
room_id, topological_ordering, topological_ordering,
|
|
stream_ordering, before_limit,
|
|
)
|
|
)
|
|
|
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rows = self.cursor_to_dict(txn)
|
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events_before = [r["event_id"] for r in rows]
|
|
|
|
if rows:
|
|
start_token = str(RoomStreamToken(
|
|
rows[0]["topological_ordering"],
|
|
rows[0]["stream_ordering"] - 1,
|
|
))
|
|
else:
|
|
start_token = str(RoomStreamToken(
|
|
topological_ordering,
|
|
stream_ordering - 1,
|
|
))
|
|
|
|
txn.execute(
|
|
query_after,
|
|
(
|
|
room_id, topological_ordering, topological_ordering,
|
|
stream_ordering, after_limit,
|
|
)
|
|
)
|
|
|
|
rows = self.cursor_to_dict(txn)
|
|
events_after = [r["event_id"] for r in rows]
|
|
|
|
if rows:
|
|
end_token = str(RoomStreamToken(
|
|
rows[-1]["topological_ordering"],
|
|
rows[-1]["stream_ordering"],
|
|
))
|
|
else:
|
|
end_token = str(RoomStreamToken(
|
|
topological_ordering,
|
|
stream_ordering,
|
|
))
|
|
|
|
return {
|
|
"before": {
|
|
"event_ids": events_before,
|
|
"token": start_token,
|
|
},
|
|
"after": {
|
|
"event_ids": events_after,
|
|
"token": end_token,
|
|
},
|
|
}
|