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- # -*- coding: utf-8 -*-
- # Copyright 2014-2016 OpenMarket Ltd
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- """ This module is responsible for getting events from the DB for pagination
- and event streaming.
- The order it returns events in depend on whether we are streaming forwards or
- are paginating backwards. We do this because we want to handle out of order
- messages nicely, while still returning them in the correct order when we
- paginate bacwards.
- This is implemented by keeping two ordering columns: stream_ordering and
- topological_ordering. Stream ordering is basically insertion/received order
- (except for events from backfill requests). The topological_ordering is a
- weak ordering of events based on the pdu graph.
- This means that we have to have two different types of tokens, depending on
- what sort order was used:
- - stream tokens are of the form: "s%d", which maps directly to the column
- - topological tokems: "t%d-%d", where the integers map to the topological
- and stream ordering columns respectively.
- """
- from twisted.internet import defer
- from synapse.storage._base import SQLBaseStore
- from synapse.storage.events import EventsWorkerStore
- from synapse.types import RoomStreamToken
- from synapse.util.caches.stream_change_cache import StreamChangeCache
- from synapse.util.logcontext import make_deferred_yieldable, run_in_background
- from synapse.storage.engines import PostgresEngine
- import abc
- import logging
- from six.moves import range
- from collections import namedtuple
- logger = logging.getLogger(__name__)
- MAX_STREAM_SIZE = 1000
- _STREAM_TOKEN = "stream"
- _TOPOLOGICAL_TOKEN = "topological"
- # Used as return values for pagination APIs
- _EventDictReturn = namedtuple("_EventDictReturn", (
- "event_id", "topological_ordering", "stream_ordering",
- ))
- def lower_bound(token, engine, inclusive=False):
- inclusive = "=" if inclusive else ""
- if token.topological is None:
- return "(%d <%s %s)" % (token.stream, inclusive, "stream_ordering")
- else:
- if isinstance(engine, PostgresEngine):
- # Postgres doesn't optimise ``(x < a) OR (x=a AND y<b)`` as well
- # as it optimises ``(x,y) < (a,b)`` on multicolumn indexes. So we
- # use the later form when running against postgres.
- return "((%d,%d) <%s (%s,%s))" % (
- token.topological, token.stream, inclusive,
- "topological_ordering", "stream_ordering",
- )
- return "(%d < %s OR (%d = %s AND %d <%s %s))" % (
- token.topological, "topological_ordering",
- token.topological, "topological_ordering",
- token.stream, inclusive, "stream_ordering",
- )
- def upper_bound(token, engine, inclusive=True):
- inclusive = "=" if inclusive else ""
- if token.topological is None:
- return "(%d >%s %s)" % (token.stream, inclusive, "stream_ordering")
- else:
- if isinstance(engine, PostgresEngine):
- # Postgres doesn't optimise ``(x > a) OR (x=a AND y>b)`` as well
- # as it optimises ``(x,y) > (a,b)`` on multicolumn indexes. So we
- # use the later form when running against postgres.
- return "((%d,%d) >%s (%s,%s))" % (
- token.topological, token.stream, inclusive,
- "topological_ordering", "stream_ordering",
- )
- return "(%d > %s OR (%d = %s AND %d >%s %s))" % (
- token.topological, "topological_ordering",
- token.topological, "topological_ordering",
- token.stream, inclusive, "stream_ordering",
- )
- def filter_to_clause(event_filter):
- # NB: This may create SQL clauses that don't optimise well (and we don't
- # have indices on all possible clauses). E.g. it may create
- # "room_id == X AND room_id != X", which postgres doesn't optimise.
- if not event_filter:
- return "", []
- clauses = []
- args = []
- if event_filter.types:
- clauses.append(
- "(%s)" % " OR ".join("type = ?" for _ in event_filter.types)
- )
- args.extend(event_filter.types)
- for typ in event_filter.not_types:
- clauses.append("type != ?")
- args.append(typ)
- if event_filter.senders:
- clauses.append(
- "(%s)" % " OR ".join("sender = ?" for _ in event_filter.senders)
- )
- args.extend(event_filter.senders)
- for sender in event_filter.not_senders:
- clauses.append("sender != ?")
- args.append(sender)
- if event_filter.rooms:
- clauses.append(
- "(%s)" % " OR ".join("room_id = ?" for _ in event_filter.rooms)
- )
- args.extend(event_filter.rooms)
- for room_id in event_filter.not_rooms:
- clauses.append("room_id != ?")
- args.append(room_id)
- if event_filter.contains_url:
- clauses.append("contains_url = ?")
- args.append(event_filter.contains_url)
- return " AND ".join(clauses), args
- class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
- """This is an abstract base class where subclasses must implement
- `get_room_max_stream_ordering` and `get_room_min_stream_ordering`
- which can be called in the initializer.
- """
- __metaclass__ = abc.ABCMeta
- def __init__(self, db_conn, hs):
- super(StreamWorkerStore, self).__init__(db_conn, hs)
- events_max = self.get_room_max_stream_ordering()
- event_cache_prefill, min_event_val = self._get_cache_dict(
- db_conn, "events",
- entity_column="room_id",
- stream_column="stream_ordering",
- max_value=events_max,
- )
- self._events_stream_cache = StreamChangeCache(
- "EventsRoomStreamChangeCache", min_event_val,
- prefilled_cache=event_cache_prefill,
- )
- self._membership_stream_cache = StreamChangeCache(
- "MembershipStreamChangeCache", events_max,
- )
- self._stream_order_on_start = self.get_room_max_stream_ordering()
- @abc.abstractmethod
- def get_room_max_stream_ordering(self):
- raise NotImplementedError()
- @abc.abstractmethod
- def get_room_min_stream_ordering(self):
- raise NotImplementedError()
- @defer.inlineCallbacks
- def get_room_events_stream_for_rooms(self, room_ids, from_key, to_key, limit=0,
- order='DESC'):
- from_id = RoomStreamToken.parse_stream_token(from_key).stream
- room_ids = yield self._events_stream_cache.get_entities_changed(
- room_ids, from_id
- )
- if not room_ids:
- defer.returnValue({})
- results = {}
- room_ids = list(room_ids)
- for rm_ids in (room_ids[i:i + 20] for i in range(0, len(room_ids), 20)):
- res = yield make_deferred_yieldable(defer.gatherResults([
- run_in_background(
- self.get_room_events_stream_for_room,
- room_id, from_key, to_key, limit, order=order,
- )
- for room_id in rm_ids
- ], consumeErrors=True))
- results.update(dict(zip(rm_ids, res)))
- defer.returnValue(results)
- def get_rooms_that_changed(self, room_ids, from_key):
- """Given a list of rooms and a token, return rooms where there may have
- been changes.
- Args:
- room_ids (list)
- from_key (str): The room_key portion of a StreamToken
- """
- from_key = RoomStreamToken.parse_stream_token(from_key).stream
- return set(
- room_id for room_id in room_ids
- if self._events_stream_cache.has_entity_changed(room_id, from_key)
- )
- @defer.inlineCallbacks
- def get_room_events_stream_for_room(self, room_id, from_key, to_key, limit=0,
- order='DESC'):
- """Get new room events in stream ordering since `from_key`.
- Args:
- room_id (str)
- from_key (str): Token from which no events are returned before
- to_key (str): Token from which no events are returned after. (This
- is typically the current stream token)
- limit (int): Maximum number of events to return
- order (str): Either "DESC" or "ASC". Determines which events are
- returned when the result is limited. If "DESC" then the most
- recent `limit` events are returned, otherwise returns the
- oldest `limit` events.
- Returns:
- Deferred[tuple[list[FrozenEvent], str]]: Returns the list of
- events (in ascending order) and the token from the start of
- the chunk of events returned.
- """
- if from_key == to_key:
- defer.returnValue(([], from_key))
- from_id = RoomStreamToken.parse_stream_token(from_key).stream
- to_id = RoomStreamToken.parse_stream_token(to_key).stream
- has_changed = yield self._events_stream_cache.has_entity_changed(
- room_id, from_id
- )
- if not has_changed:
- defer.returnValue(([], from_key))
- def f(txn):
- sql = (
- "SELECT event_id, stream_ordering FROM events WHERE"
- " room_id = ?"
- " AND not outlier"
- " AND stream_ordering > ? AND stream_ordering <= ?"
- " ORDER BY stream_ordering %s LIMIT ?"
- ) % (order,)
- txn.execute(sql, (room_id, from_id, to_id, limit))
- rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
- return rows
- rows = yield self.runInteraction("get_room_events_stream_for_room", f)
- ret = yield self._get_events(
- [r.event_id for r in rows],
- get_prev_content=True
- )
- self._set_before_and_after(ret, rows, topo_order=from_id is None)
- if order.lower() == "desc":
- ret.reverse()
- if rows:
- key = "s%d" % min(r.stream_ordering for r in rows)
- else:
- # Assume we didn't get anything because there was nothing to
- # get.
- key = from_key
- defer.returnValue((ret, key))
- @defer.inlineCallbacks
- def get_membership_changes_for_user(self, user_id, from_key, to_key):
- from_id = RoomStreamToken.parse_stream_token(from_key).stream
- to_id = RoomStreamToken.parse_stream_token(to_key).stream
- if from_key == to_key:
- defer.returnValue([])
- if from_id:
- has_changed = self._membership_stream_cache.has_entity_changed(
- user_id, int(from_id)
- )
- if not has_changed:
- defer.returnValue([])
- def f(txn):
- sql = (
- "SELECT m.event_id, stream_ordering FROM events AS e,"
- " room_memberships AS m"
- " WHERE e.event_id = m.event_id"
- " AND m.user_id = ?"
- " AND e.stream_ordering > ? AND e.stream_ordering <= ?"
- " ORDER BY e.stream_ordering ASC"
- )
- txn.execute(sql, (user_id, from_id, to_id,))
- rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
- return rows
- rows = yield self.runInteraction("get_membership_changes_for_user", f)
- ret = yield self._get_events(
- [r.event_id for r in rows],
- get_prev_content=True
- )
- self._set_before_and_after(ret, rows, topo_order=False)
- defer.returnValue(ret)
- @defer.inlineCallbacks
- def get_recent_events_for_room(self, room_id, limit, end_token):
- """Get the most recent events in the room in topological ordering.
- Args:
- room_id (str)
- limit (int)
- end_token (str): The stream token representing now.
- Returns:
- Deferred[tuple[list[FrozenEvent], str]]: Returns a list of
- events and a token pointing to the start of the returned
- events.
- The events returned are in ascending order.
- """
- rows, token = yield self.get_recent_event_ids_for_room(
- room_id, limit, end_token,
- )
- logger.debug("stream before")
- events = yield self._get_events(
- [r.event_id for r in rows],
- get_prev_content=True
- )
- logger.debug("stream after")
- self._set_before_and_after(events, rows)
- defer.returnValue((events, token))
- @defer.inlineCallbacks
- def get_recent_event_ids_for_room(self, room_id, limit, end_token):
- """Get the most recent events in the room in topological ordering.
- Args:
- room_id (str)
- limit (int)
- end_token (str): The stream token representing now.
- Returns:
- Deferred[tuple[list[_EventDictReturn], str]]: Returns a list of
- _EventDictReturn and a token pointing to the start of the returned
- events.
- The events returned are in ascending order.
- """
- # Allow a zero limit here, and no-op.
- if limit == 0:
- defer.returnValue(([], end_token))
- end_token = RoomStreamToken.parse(end_token)
- rows, token = yield self.runInteraction(
- "get_recent_event_ids_for_room", self._paginate_room_events_txn,
- room_id, from_token=end_token, limit=limit,
- )
- # We want to return the results in ascending order.
- rows.reverse()
- defer.returnValue((rows, token))
- def get_room_event_after_stream_ordering(self, room_id, stream_ordering):
- """Gets details of the first event in a room at or after a stream ordering
- Args:
- room_id (str):
- stream_ordering (int):
- Returns:
- Deferred[(int, int, str)]:
- (stream ordering, topological ordering, event_id)
- """
- def _f(txn):
- sql = (
- "SELECT stream_ordering, topological_ordering, event_id"
- " FROM events"
- " WHERE room_id = ? AND stream_ordering >= ?"
- " AND NOT outlier"
- " ORDER BY stream_ordering"
- " LIMIT 1"
- )
- txn.execute(sql, (room_id, stream_ordering, ))
- return txn.fetchone()
- return self.runInteraction(
- "get_room_event_after_stream_ordering", _f,
- )
- @defer.inlineCallbacks
- def get_room_events_max_id(self, room_id=None):
- """Returns the current token for rooms stream.
- By default, it returns the current global stream token. Specifying a
- `room_id` causes it to return the current room specific topological
- token.
- """
- token = yield self.get_room_max_stream_ordering()
- if room_id is None:
- defer.returnValue("s%d" % (token,))
- else:
- topo = yield self.runInteraction(
- "_get_max_topological_txn", self._get_max_topological_txn,
- room_id,
- )
- defer.returnValue("t%d-%d" % (topo, token))
- def get_stream_token_for_event(self, event_id):
- """The stream token for an event
- Args:
- event_id(str): The id of the event to look up a stream token for.
- Raises:
- StoreError if the event wasn't in the database.
- Returns:
- A deferred "s%d" stream token.
- """
- return self._simple_select_one_onecol(
- table="events",
- keyvalues={"event_id": event_id},
- retcol="stream_ordering",
- ).addCallback(lambda row: "s%d" % (row,))
- def get_topological_token_for_event(self, event_id):
- """The stream token for an event
- Args:
- event_id(str): The id of the event to look up a stream token for.
- Raises:
- StoreError if the event wasn't in the database.
- Returns:
- A deferred "t%d-%d" topological token.
- """
- return self._simple_select_one(
- table="events",
- keyvalues={"event_id": event_id},
- retcols=("stream_ordering", "topological_ordering"),
- desc="get_topological_token_for_event",
- ).addCallback(lambda row: "t%d-%d" % (
- row["topological_ordering"], row["stream_ordering"],)
- )
- def get_max_topological_token(self, room_id, stream_key):
- sql = (
- "SELECT max(topological_ordering) FROM events"
- " WHERE room_id = ? AND stream_ordering < ?"
- )
- return self._execute(
- "get_max_topological_token", None,
- sql, room_id, stream_key,
- ).addCallback(
- lambda r: r[0][0] if r else 0
- )
- def _get_max_topological_txn(self, txn, room_id):
- txn.execute(
- "SELECT MAX(topological_ordering) FROM events"
- " WHERE room_id = ?",
- (room_id,)
- )
- rows = txn.fetchall()
- return rows[0][0] if rows else 0
- @staticmethod
- def _set_before_and_after(events, rows, topo_order=True):
- """Inserts ordering information to events' internal metadata from
- the DB rows.
- Args:
- events (list[FrozenEvent])
- rows (list[_EventDictReturn])
- topo_order (bool): Whether the events were ordered topologically
- or by stream ordering. If true then all rows should have a non
- null topological_ordering.
- """
- for event, row in zip(events, rows):
- stream = row.stream_ordering
- if topo_order and row.topological_ordering:
- topo = row.topological_ordering
- else:
- topo = None
- internal = event.internal_metadata
- internal.before = str(RoomStreamToken(topo, stream - 1))
- internal.after = str(RoomStreamToken(topo, stream))
- internal.order = (
- int(topo) if topo else 0,
- int(stream),
- )
- @defer.inlineCallbacks
- def get_events_around(self, room_id, event_id, before_limit, after_limit):
- """Retrieve events and pagination tokens around a given event in a
- room.
- Args:
- room_id (str)
- event_id (str)
- before_limit (int)
- after_limit (int)
- Returns:
- dict
- """
- results = yield self.runInteraction(
- "get_events_around", self._get_events_around_txn,
- room_id, event_id, before_limit, after_limit
- )
- events_before = yield self._get_events(
- [e for e in results["before"]["event_ids"]],
- get_prev_content=True
- )
- events_after = yield self._get_events(
- [e for e in results["after"]["event_ids"]],
- get_prev_content=True
- )
- defer.returnValue({
- "events_before": events_before,
- "events_after": events_after,
- "start": results["before"]["token"],
- "end": results["after"]["token"],
- })
- 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
- room.
- Args:
- room_id (str)
- event_id (str)
- before_limit (int)
- after_limit (int)
- Returns:
- dict
- """
- results = self._simple_select_one_txn(
- txn,
- "events",
- keyvalues={
- "event_id": event_id,
- "room_id": room_id,
- },
- retcols=["stream_ordering", "topological_ordering"],
- )
- # Paginating backwards includes the event at the token, but paginating
- # forward doesn't.
- before_token = RoomStreamToken(
- results["topological_ordering"] - 1,
- results["stream_ordering"],
- )
- after_token = RoomStreamToken(
- results["topological_ordering"],
- results["stream_ordering"],
- )
- rows, start_token = self._paginate_room_events_txn(
- txn, room_id, before_token, direction='b', limit=before_limit,
- )
- events_before = [r.event_id for r in rows]
- rows, end_token = self._paginate_room_events_txn(
- txn, room_id, after_token, direction='f', limit=after_limit,
- )
- events_after = [r.event_id for r in rows]
- return {
- "before": {
- "event_ids": events_before,
- "token": start_token,
- },
- "after": {
- "event_ids": events_after,
- "token": end_token,
- },
- }
- @defer.inlineCallbacks
- def get_all_new_events_stream(self, from_id, current_id, limit):
- """Get all new events"""
- def get_all_new_events_stream_txn(txn):
- sql = (
- "SELECT e.stream_ordering, e.event_id"
- " FROM events AS e"
- " WHERE"
- " ? < e.stream_ordering AND e.stream_ordering <= ?"
- " ORDER BY e.stream_ordering ASC"
- " LIMIT ?"
- )
- txn.execute(sql, (from_id, current_id, limit))
- rows = txn.fetchall()
- upper_bound = current_id
- if len(rows) == limit:
- upper_bound = rows[-1][0]
- return upper_bound, [row[1] for row in rows]
- upper_bound, event_ids = yield self.runInteraction(
- "get_all_new_events_stream", get_all_new_events_stream_txn,
- )
- events = yield self._get_events(event_ids)
- defer.returnValue((upper_bound, events))
- def get_federation_out_pos(self, typ):
- return self._simple_select_one_onecol(
- table="federation_stream_position",
- retcol="stream_id",
- keyvalues={"type": typ},
- desc="get_federation_out_pos"
- )
- def update_federation_out_pos(self, typ, stream_id):
- return self._simple_update_one(
- table="federation_stream_position",
- keyvalues={"type": typ},
- updatevalues={"stream_id": stream_id},
- desc="update_federation_out_pos",
- )
- def has_room_changed_since(self, room_id, stream_id):
- return self._events_stream_cache.has_entity_changed(room_id, stream_id)
- def _paginate_room_events_txn(self, txn, room_id, from_token, to_token=None,
- direction='b', limit=-1, event_filter=None):
- """Returns list of events before or after a given token.
- Args:
- txn
- room_id (str)
- from_token (RoomStreamToken): The token used to stream from
- to_token (RoomStreamToken|None): A token which if given limits the
- results to only those before
- direction(char): Either 'b' or 'f' to indicate whether we are
- paginating forwards or backwards from `from_key`.
- limit (int): The maximum number of events to return.
- event_filter (Filter|None): If provided filters the events to
- those that match the filter.
- Returns:
- Deferred[tuple[list[_EventDictReturn], str]]: Returns the results
- as a list of _EventDictReturn and a token that points to the end
- of the result set.
- """
- assert int(limit) >= 0
- # Tokens really represent positions between elements, but we use
- # the convention of pointing to the event before the gap. Hence
- # we have a bit of asymmetry when it comes to equalities.
- args = [False, room_id]
- if direction == 'b':
- order = "DESC"
- bounds = upper_bound(
- from_token, self.database_engine
- )
- if to_token:
- bounds = "%s AND %s" % (bounds, lower_bound(
- to_token, self.database_engine
- ))
- else:
- order = "ASC"
- bounds = lower_bound(
- from_token, self.database_engine
- )
- if to_token:
- bounds = "%s AND %s" % (bounds, upper_bound(
- to_token, self.database_engine
- ))
- filter_clause, filter_args = filter_to_clause(event_filter)
- if filter_clause:
- bounds += " AND " + filter_clause
- args.extend(filter_args)
- args.append(int(limit))
- sql = (
- "SELECT event_id, topological_ordering, stream_ordering"
- " FROM events"
- " WHERE outlier = ? AND room_id = ? AND %(bounds)s"
- " ORDER BY topological_ordering %(order)s,"
- " stream_ordering %(order)s LIMIT ?"
- ) % {
- "bounds": bounds,
- "order": order,
- }
- txn.execute(sql, args)
- rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]
- if rows:
- topo = rows[-1].topological_ordering
- toke = rows[-1].stream_ordering
- if direction == 'b':
- # Tokens are positions between events.
- # This token points *after* the last event in the chunk.
- # We need it to point to the event before it in the chunk
- # when we are going backwards so we subtract one from the
- # stream part.
- toke -= 1
- next_token = RoomStreamToken(topo, toke)
- else:
- # TODO (erikj): We should work out what to do here instead.
- next_token = to_token if to_token else from_token
- return rows, str(next_token),
- @defer.inlineCallbacks
- def paginate_room_events(self, room_id, from_key, to_key=None,
- direction='b', limit=-1, event_filter=None):
- """Returns list of events before or after a given token.
- Args:
- room_id (str)
- from_key (str): The token used to stream from
- to_key (str|None): A token which if given limits the results to
- only those before
- direction(char): Either 'b' or 'f' to indicate whether we are
- paginating forwards or backwards from `from_key`.
- limit (int): The maximum number of events to return. Zero or less
- means no limit.
- event_filter (Filter|None): If provided filters the events to
- those that match the filter.
- Returns:
- tuple[list[dict], str]: Returns the results as a list of dicts and
- a token that points to the end of the result set. The dicts have
- the keys "event_id", "topological_ordering" and "stream_orderign".
- """
- from_key = RoomStreamToken.parse(from_key)
- if to_key:
- to_key = RoomStreamToken.parse(to_key)
- rows, token = yield self.runInteraction(
- "paginate_room_events", self._paginate_room_events_txn,
- room_id, from_key, to_key, direction, limit, event_filter,
- )
- events = yield self._get_events(
- [r.event_id for r in rows],
- get_prev_content=True
- )
- self._set_before_and_after(events, rows)
- defer.returnValue((events, token))
- class StreamStore(StreamWorkerStore):
- def get_room_max_stream_ordering(self):
- return self._stream_id_gen.get_current_token()
- def get_room_min_stream_ordering(self):
- return self._backfill_id_gen.get_current_token()
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