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951 lines
32 KiB
Python
951 lines
32 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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import abc
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import logging
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from collections import namedtuple
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from six.moves import range
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from twisted.internet import defer
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from synapse.logging.context import make_deferred_yieldable, run_in_background
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.engines import PostgresEngine
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from synapse.storage.events_worker import EventsWorkerStore
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from synapse.types import RoomStreamToken
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from synapse.util.caches.stream_change_cache import StreamChangeCache
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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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# Used as return values for pagination APIs
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_EventDictReturn = namedtuple(
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"_EventDictReturn", ("event_id", "topological_ordering", "stream_ordering")
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)
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def generate_pagination_where_clause(
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direction, column_names, from_token, to_token, engine
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):
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"""Creates an SQL expression to bound the columns by the pagination
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tokens.
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For example creates an SQL expression like:
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(6, 7) >= (topological_ordering, stream_ordering)
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AND (5, 3) < (topological_ordering, stream_ordering)
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would be generated for dir=b, from_token=(6, 7) and to_token=(5, 3).
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Note that tokens are considered to be after the row they are in, e.g. if
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a row A has a token T, then we consider A to be before T. This convention
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is important when figuring out inequalities for the generated SQL, and
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produces the following result:
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- If paginating forwards then we exclude any rows matching the from
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token, but include those that match the to token.
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- If paginating backwards then we include any rows matching the from
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token, but include those that match the to token.
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Args:
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direction (str): Whether we're paginating backwards("b") or
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forwards ("f").
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column_names (tuple[str, str]): The column names to bound. Must *not*
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be user defined as these get inserted directly into the SQL
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statement without escapes.
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from_token (tuple[int, int]|None): The start point for the pagination.
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This is an exclusive minimum bound if direction is "f", and an
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inclusive maximum bound if direction is "b".
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to_token (tuple[int, int]|None): The endpoint point for the pagination.
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This is an inclusive maximum bound if direction is "f", and an
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exclusive minimum bound if direction is "b".
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engine: The database engine to generate the clauses for
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Returns:
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str: The sql expression
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"""
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assert direction in ("b", "f")
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where_clause = []
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if from_token:
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where_clause.append(
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_make_generic_sql_bound(
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bound=">=" if direction == "b" else "<",
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column_names=column_names,
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values=from_token,
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engine=engine,
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)
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)
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if to_token:
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where_clause.append(
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_make_generic_sql_bound(
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bound="<" if direction == "b" else ">=",
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column_names=column_names,
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values=to_token,
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engine=engine,
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)
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)
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return " AND ".join(where_clause)
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def _make_generic_sql_bound(bound, column_names, values, engine):
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"""Create an SQL expression that bounds the given column names by the
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values, e.g. create the equivalent of `(1, 2) < (col1, col2)`.
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Only works with two columns.
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Older versions of SQLite don't support that syntax so we have to expand it
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out manually.
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Args:
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bound (str): The comparison operator to use. One of ">", "<", ">=",
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"<=", where the values are on the left and columns on the right.
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names (tuple[str, str]): The column names. Must *not* be user defined
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as these get inserted directly into the SQL statement without
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escapes.
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values (tuple[int|None, int]): The values to bound the columns by. If
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the first value is None then only creates a bound on the second
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column.
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engine: The database engine to generate the SQL for
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Returns:
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str
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"""
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assert bound in (">", "<", ">=", "<=")
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name1, name2 = column_names
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val1, val2 = values
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if val1 is None:
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val2 = int(val2)
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return "(%d %s %s)" % (val2, bound, name2)
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val1 = int(val1)
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val2 = int(val2)
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if isinstance(engine, PostgresEngine):
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# Postgres doesn't optimise ``(x < a) OR (x=a AND y<b)`` as well
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# as it optimises ``(x,y) < (a,b)`` on multicolumn indexes. So we
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# use the later form when running against postgres.
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return "((%d,%d) %s (%s,%s))" % (val1, val2, bound, name1, name2)
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# We want to generate queries of e.g. the form:
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#
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# (val1 < name1 OR (val1 = name1 AND val2 <= name2))
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#
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# which is equivalent to (val1, val2) < (name1, name2)
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return """(
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{val1:d} {strict_bound} {name1}
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OR ({val1:d} = {name1} AND {val2:d} {bound} {name2})
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)""".format(
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name1=name1,
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val1=val1,
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name2=name2,
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val2=val2,
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strict_bound=bound[0], # The first bound must always be strict equality here
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bound=bound,
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)
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def filter_to_clause(event_filter):
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# NB: This may create SQL clauses that don't optimise well (and we don't
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# have indices on all possible clauses). E.g. it may create
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# "room_id == X AND room_id != X", which postgres doesn't optimise.
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if not event_filter:
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return "", []
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clauses = []
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args = []
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if event_filter.types:
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clauses.append("(%s)" % " OR ".join("type = ?" for _ in event_filter.types))
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args.extend(event_filter.types)
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for typ in event_filter.not_types:
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clauses.append("type != ?")
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args.append(typ)
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if event_filter.senders:
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clauses.append("(%s)" % " OR ".join("sender = ?" for _ in event_filter.senders))
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args.extend(event_filter.senders)
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for sender in event_filter.not_senders:
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clauses.append("sender != ?")
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args.append(sender)
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if event_filter.rooms:
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clauses.append("(%s)" % " OR ".join("room_id = ?" for _ in event_filter.rooms))
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args.extend(event_filter.rooms)
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for room_id in event_filter.not_rooms:
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clauses.append("room_id != ?")
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args.append(room_id)
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if event_filter.contains_url:
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clauses.append("contains_url = ?")
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args.append(event_filter.contains_url)
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return " AND ".join(clauses), args
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class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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"""This is an abstract base class where subclasses must implement
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`get_room_max_stream_ordering` and `get_room_min_stream_ordering`
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which can be called in the initializer.
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"""
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__metaclass__ = abc.ABCMeta
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def __init__(self, db_conn, hs):
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super(StreamWorkerStore, self).__init__(db_conn, hs)
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events_max = self.get_room_max_stream_ordering()
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event_cache_prefill, min_event_val = self._get_cache_dict(
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db_conn,
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"events",
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entity_column="room_id",
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stream_column="stream_ordering",
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max_value=events_max,
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)
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self._events_stream_cache = StreamChangeCache(
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"EventsRoomStreamChangeCache",
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min_event_val,
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prefilled_cache=event_cache_prefill,
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)
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self._membership_stream_cache = StreamChangeCache(
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"MembershipStreamChangeCache", events_max
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)
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self._stream_order_on_start = self.get_room_max_stream_ordering()
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@abc.abstractmethod
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def get_room_max_stream_ordering(self):
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raise NotImplementedError()
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@abc.abstractmethod
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def get_room_min_stream_ordering(self):
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raise NotImplementedError()
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@defer.inlineCallbacks
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def get_room_events_stream_for_rooms(
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self, room_ids, from_key, to_key, limit=0, order="DESC"
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):
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"""Get new room events in stream ordering since `from_key`.
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Args:
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room_id (str)
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from_key (str): Token from which no events are returned before
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to_key (str): Token from which no events are returned after. (This
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is typically the current stream token)
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limit (int): Maximum number of events to return
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order (str): Either "DESC" or "ASC". Determines which events are
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returned when the result is limited. If "DESC" then the most
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recent `limit` events are returned, otherwise returns the
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oldest `limit` events.
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Returns:
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Deferred[dict[str,tuple[list[FrozenEvent], str]]]
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A map from room id to a tuple containing:
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- list of recent events in the room
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- stream ordering key for the start of the chunk of events returned.
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"""
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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 range(0, len(room_ids), 20)):
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res = yield make_deferred_yieldable(
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defer.gatherResults(
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[
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run_in_background(
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self.get_room_events_stream_for_room,
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room_id,
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from_key,
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to_key,
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limit,
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order=order,
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)
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for room_id in rm_ids
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],
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consumeErrors=True,
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)
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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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def get_rooms_that_changed(self, room_ids, from_key):
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"""Given a list of rooms and a token, return rooms where there may have
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been changes.
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Args:
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room_ids (list)
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from_key (str): The room_key portion of a StreamToken
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"""
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from_key = RoomStreamToken.parse_stream_token(from_key).stream
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return set(
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room_id
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for room_id in room_ids
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if self._events_stream_cache.has_entity_changed(room_id, from_key)
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)
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@defer.inlineCallbacks
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def get_room_events_stream_for_room(
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self, room_id, from_key, to_key, limit=0, order="DESC"
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):
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"""Get new room events in stream ordering since `from_key`.
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Args:
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room_id (str)
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from_key (str): Token from which no events are returned before
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to_key (str): Token from which no events are returned after. (This
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is typically the current stream token)
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limit (int): Maximum number of events to return
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order (str): Either "DESC" or "ASC". Determines which events are
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returned when the result is limited. If "DESC" then the most
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recent `limit` events are returned, otherwise returns the
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oldest `limit` events.
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Returns:
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Deferred[tuple[list[FrozenEvent], str]]: Returns the list of
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events (in ascending order) and the token from the start of
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the chunk of events returned.
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"""
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if from_key == to_key:
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defer.returnValue(([], from_key))
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from_id = RoomStreamToken.parse_stream_token(from_key).stream
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to_id = RoomStreamToken.parse_stream_token(to_key).stream
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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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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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rows = [_EventDictReturn(row[0], None, row[1]) for row in 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_as_list(
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[r.event_id for r in rows], 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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from_id = RoomStreamToken.parse_stream_token(from_key).stream
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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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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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rows = [_EventDictReturn(row[0], None, row[1]) for row in 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_as_list(
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[r.event_id for r in rows], 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 get_recent_events_for_room(self, room_id, limit, end_token):
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"""Get the most recent events in the room in topological ordering.
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Args:
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room_id (str)
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limit (int)
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end_token (str): The stream token representing now.
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Returns:
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Deferred[tuple[list[FrozenEvent], str]]: Returns a list of
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events and a token pointing to the start of the returned
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events.
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The events returned are in ascending order.
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"""
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rows, token = yield self.get_recent_event_ids_for_room(
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room_id, limit, end_token
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)
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logger.debug("stream before")
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events = yield self.get_events_as_list(
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[r.event_id for r in rows], 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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@defer.inlineCallbacks
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def get_recent_event_ids_for_room(self, room_id, limit, end_token):
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"""Get the most recent events in the room in topological ordering.
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Args:
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room_id (str)
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limit (int)
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end_token (str): The stream token representing now.
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Returns:
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Deferred[tuple[list[_EventDictReturn], str]]: Returns a list of
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_EventDictReturn and a token pointing to the start of the returned
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events.
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The events returned are in ascending order.
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"""
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# Allow a zero limit here, and no-op.
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if limit == 0:
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defer.returnValue(([], end_token))
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end_token = RoomStreamToken.parse(end_token)
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rows, token = yield self.runInteraction(
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"get_recent_event_ids_for_room",
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self._paginate_room_events_txn,
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room_id,
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from_token=end_token,
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limit=limit,
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)
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# We want to return the results in ascending order.
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rows.reverse()
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defer.returnValue((rows, token))
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def get_room_event_after_stream_ordering(self, room_id, stream_ordering):
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"""Gets details of the first event in a room at or after a stream ordering
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Args:
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room_id (str):
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stream_ordering (int):
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Returns:
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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):
|
|
"""Get the max topological token in a room before the given stream
|
|
ordering.
|
|
|
|
Args:
|
|
room_id (str)
|
|
stream_key (int)
|
|
|
|
Returns:
|
|
Deferred[int]
|
|
"""
|
|
sql = (
|
|
"SELECT coalesce(max(topological_ordering), 0) 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, event_filter=None
|
|
):
|
|
"""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)
|
|
event_filter (Filter|None)
|
|
|
|
Returns:
|
|
dict
|
|
"""
|
|
|
|
results = yield self.runInteraction(
|
|
"get_events_around",
|
|
self._get_events_around_txn,
|
|
room_id,
|
|
event_id,
|
|
before_limit,
|
|
after_limit,
|
|
event_filter,
|
|
)
|
|
|
|
events_before = yield self.get_events_as_list(
|
|
[e for e in results["before"]["event_ids"]], get_prev_content=True
|
|
)
|
|
|
|
events_after = yield self.get_events_as_list(
|
|
[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, event_filter
|
|
):
|
|
"""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)
|
|
event_filter (Filter|None)
|
|
|
|
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,
|
|
event_filter=event_filter,
|
|
)
|
|
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,
|
|
event_filter=event_filter,
|
|
)
|
|
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
|
|
|
|
Returns all events with from_id < stream_ordering <= current_id.
|
|
|
|
Args:
|
|
from_id (int): the stream_ordering of the last event we processed
|
|
current_id (int): the stream_ordering of the most recently processed event
|
|
limit (int): the maximum number of events to return
|
|
|
|
Returns:
|
|
Deferred[Tuple[int, list[FrozenEvent]]]: A tuple of (next_id, events), where
|
|
`next_id` is the next value to pass as `from_id` (it will either be the
|
|
stream_ordering of the last returned event, or, if fewer than `limit` events
|
|
were found, `current_id`.
|
|
"""
|
|
|
|
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_as_list(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. If no events are returned then the end of the
|
|
stream has been reached (i.e. there are no events between
|
|
`from_token` and `to_token`), or `limit` is zero.
|
|
"""
|
|
|
|
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"
|
|
else:
|
|
order = "ASC"
|
|
|
|
bounds = generate_pagination_where_clause(
|
|
direction=direction,
|
|
column_names=("topological_ordering", "stream_ordering"),
|
|
from_token=from_token,
|
|
to_token=to_token,
|
|
engine=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.
|
|
event_filter (Filter|None): If provided filters the events to
|
|
those that match the filter.
|
|
|
|
Returns:
|
|
tuple[list[FrozenEvent], str]: Returns the results as a list of
|
|
events and a token that points to the end of the result set. If no
|
|
events are returned then the end of the stream has been reached
|
|
(i.e. there are no events between `from_key` and `to_key`).
|
|
"""
|
|
|
|
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_as_list(
|
|
[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()
|