mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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c66a06ac6b
This is in preparation for having multiple data stores that offer different functionality, e.g. splitting out state or event storage.
949 lines
32 KiB
Python
949 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.data_stores.main.events_worker import EventsWorkerStore
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from synapse.storage.engines import PostgresEngine
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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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return {}
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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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return 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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return [], 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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return [], 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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return 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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return []
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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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return []
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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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return 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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return (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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|
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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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return [], 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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return 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)]:
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(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:
|
|
return "s%d" % (token,)
|
|
else:
|
|
topo = yield self.runInteraction(
|
|
"_get_max_topological_txn", self._get_max_topological_txn, room_id
|
|
)
|
|
return "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
|
|
)
|
|
|
|
return {
|
|
"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)
|
|
|
|
return 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)
|
|
|
|
return (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()
|