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Land improved room list based on room stats (#6019)

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Use room_stats and room_state for room directory search
This commit is contained in:
Erik Johnston 2019-10-02 14:08:35 +01:00 committed by GitHub
parent 864f144543
commit a5166e4d5f
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7 changed files with 282 additions and 359 deletions
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1
changelog.d/6019.misc Normal file
View file

@ -0,0 +1 @@
Improve performance of the public room list directory.

8
synapse/federation/transport/server.py
View file

@ -765,6 +765,10 @@ class PublicRoomList(BaseFederationServlet):
else:
network_tuple = ThirdPartyInstanceID(None, None)
if limit == 0:
# zero is a special value which corresponds to no limit.
limit = None
data = await maybeDeferred(
self.handler.get_local_public_room_list,
limit,
@ -800,6 +804,10 @@ class PublicRoomList(BaseFederationServlet):
if search_filter is None:
logger.warning("Nonefilter")
if limit == 0:
# zero is a special value which corresponds to no limit.
limit = None
data = await self.handler.get_local_public_room_list(
limit=limit,
since_token=since_token,

331
synapse/handlers/room_list.py
View file

@ -16,8 +16,7 @@
import logging
from collections import namedtuple
from six import PY3, iteritems
from six.moves import range
from six import iteritems
import msgpack
from unpaddedbase64 import decode_base64, encode_base64
@ -27,7 +26,6 @@ from twisted.internet import defer
from synapse.api.constants import EventTypes, JoinRules
from synapse.api.errors import Codes, HttpResponseException
from synapse.types import ThirdPartyInstanceID
from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.util.caches.response_cache import ResponseCache
@ -37,7 +35,6 @@ logger = logging.getLogger(__name__)
REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
# This is used to indicate we should only return rooms published to the main list.
EMPTY_THIRD_PARTY_ID = ThirdPartyInstanceID(None, None)
@ -72,6 +69,8 @@ class RoomListHandler(BaseHandler):
This can be (None, None) to indicate the main list, or a particular
appservice and network id to use an appservice specific one.
Setting to None returns all public rooms across all lists.
from_federation (bool): true iff the request comes from the federation
API
"""
if not self.enable_room_list_search:
return defer.succeed({"chunk": [], "total_room_count_estimate": 0})
@ -133,239 +132,109 @@ class RoomListHandler(BaseHandler):
from_federation (bool): Whether this request originated from a
federating server or a client. Used for room filtering.
timeout (int|None): Amount of seconds to wait for a response before
timing out.
timing out. TODO
"""
if since_token and since_token != "END":
since_token = RoomListNextBatch.from_token(since_token)
else:
since_token = None
rooms_to_order_value = {}
rooms_to_num_joined = {}
# Pagination tokens work by storing the room ID sent in the last batch,
# plus the direction (forwards or backwards). Next batch tokens always
# go forwards, prev batch tokens always go backwards.
newly_visible = []
newly_unpublished = []
if since_token:
stream_token = since_token.stream_ordering
current_public_id = yield self.store.get_current_public_room_stream_id()
public_room_stream_id = since_token.public_room_stream_id
newly_visible, newly_unpublished = yield self.store.get_public_room_changes(
public_room_stream_id, current_public_id, network_tuple=network_tuple
)
else:
stream_token = yield self.store.get_room_max_stream_ordering()
public_room_stream_id = yield self.store.get_current_public_room_stream_id()
batch_token = RoomListNextBatch.from_token(since_token)
room_ids = yield self.store.get_public_room_ids_at_stream_id(
public_room_stream_id, network_tuple=network_tuple
last_room_id = batch_token.last_room_id
forwards = batch_token.direction_is_forward
else:
batch_token = None
last_room_id = None
forwards = True
# we request one more than wanted to see if there are more pages to come
probing_limit = limit + 1 if limit is not None else None
results = yield self.store.get_largest_public_rooms(
network_tuple,
search_filter,
probing_limit,
last_room_id=last_room_id,
forwards=forwards,
ignore_non_federatable=from_federation,
)
# We want to return rooms in a particular order: the number of joined
# users. We then arbitrarily use the room_id as a tie breaker.
def build_room_entry(room):
entry = {
"room_id": room["room_id"],
"name": room["name"],
"topic": room["topic"],
"canonical_alias": room["canonical_alias"],
"num_joined_members": room["joined_members"],
"avatar_url": room["avatar"],
"world_readable": room["history_visibility"] == "world_readable",
"guest_can_join": room["guest_access"] == "can_join",
}
@defer.inlineCallbacks
def get_order_for_room(room_id):
# Most of the rooms won't have changed between the since token and
# now (especially if the since token is "now"). So, we can ask what
# the current users are in a room (that will hit a cache) and then
# check if the room has changed since the since token. (We have to
# do it in that order to avoid races).
# If things have changed then fall back to getting the current state
# at the since token.
joined_users = yield self.store.get_users_in_room(room_id)
if self.store.has_room_changed_since(room_id, stream_token):
latest_event_ids = yield self.store.get_forward_extremeties_for_room(
room_id, stream_token
)
# Filter out Nones – rather omit the field altogether
return {k: v for k, v in entry.items() if v is not None}
if not latest_event_ids:
return
results = [build_room_entry(r) for r in results]
joined_users = yield self.state_handler.get_current_users_in_room(
room_id, latest_event_ids
)
response = {}
num_results = len(results)
if limit is not None:
more_to_come = num_results == probing_limit
num_joined_users = len(joined_users)
rooms_to_num_joined[room_id] = num_joined_users
# Depending on direction we trim either the front or back.
if forwards:
results = results[:limit]
else:
results = results[-limit:]
else:
more_to_come = False
if num_joined_users == 0:
return
if num_results > 0:
final_room_id = results[-1]["room_id"]
initial_room_id = results[0]["room_id"]
# We want larger rooms to be first, hence negating num_joined_users
rooms_to_order_value[room_id] = (-num_joined_users, room_id)
if forwards:
if batch_token:
# If there was a token given then we assume that there
# must be previous results.
response["prev_batch"] = RoomListNextBatch(
last_room_id=initial_room_id, direction_is_forward=False
).to_token()
logger.info(
"Getting ordering for %i rooms since %s", len(room_ids), stream_token
if more_to_come:
response["next_batch"] = RoomListNextBatch(
last_room_id=final_room_id, direction_is_forward=True
).to_token()
else:
if batch_token:
response["next_batch"] = RoomListNextBatch(
last_room_id=final_room_id, direction_is_forward=True
).to_token()
if more_to_come:
response["prev_batch"] = RoomListNextBatch(
last_room_id=initial_room_id, direction_is_forward=False
).to_token()
for room in results:
# populate search result entries with additional fields, namely
# 'aliases'
room_id = room["room_id"]
aliases = yield self.store.get_aliases_for_room(room_id)
if aliases:
room["aliases"] = aliases
response["chunk"] = results
response["total_room_count_estimate"] = yield self.store.count_public_rooms(
network_tuple, ignore_non_federatable=from_federation
)
yield concurrently_execute(get_order_for_room, room_ids, 10)
sorted_entries = sorted(rooms_to_order_value.items(), key=lambda e: e[1])
sorted_rooms = [room_id for room_id, _ in sorted_entries]
# `sorted_rooms` should now be a list of all public room ids that is
# stable across pagination. Therefore, we can use indices into this
# list as our pagination tokens.
# Filter out rooms that we don't want to return
rooms_to_scan = [
r
for r in sorted_rooms
if r not in newly_unpublished and rooms_to_num_joined[r] > 0
]
total_room_count = len(rooms_to_scan)
if since_token:
# Filter out rooms we've already returned previously
# `since_token.current_limit` is the index of the last room we
# sent down, so we exclude it and everything before/after it.
if since_token.direction_is_forward:
rooms_to_scan = rooms_to_scan[since_token.current_limit + 1 :]
else:
rooms_to_scan = rooms_to_scan[: since_token.current_limit]
rooms_to_scan.reverse()
logger.info("After sorting and filtering, %i rooms remain", len(rooms_to_scan))
# _append_room_entry_to_chunk will append to chunk but will stop if
# len(chunk) > limit
#
# Normally we will generate enough results on the first iteration here,
# but if there is a search filter, _append_room_entry_to_chunk may
# filter some results out, in which case we loop again.
#
# We don't want to scan over the entire range either as that
# would potentially waste a lot of work.
#
# XXX if there is no limit, we may end up DoSing the server with
# calls to get_current_state_ids for every single room on the
# server. Surely we should cap this somehow?
#
if limit:
step = limit + 1
else:
# step cannot be zero
step = len(rooms_to_scan) if len(rooms_to_scan) != 0 else 1
chunk = []
for i in range(0, len(rooms_to_scan), step):
if timeout and self.clock.time() > timeout:
raise Exception("Timed out searching room directory")
batch = rooms_to_scan[i : i + step]
logger.info("Processing %i rooms for result", len(batch))
yield concurrently_execute(
lambda r: self._append_room_entry_to_chunk(
r,
rooms_to_num_joined[r],
chunk,
limit,
search_filter,
from_federation=from_federation,
),
batch,
5,
)
logger.info("Now %i rooms in result", len(chunk))
if len(chunk) >= limit + 1:
break
chunk.sort(key=lambda e: (-e["num_joined_members"], e["room_id"]))
# Work out the new limit of the batch for pagination, or None if we
# know there are no more results that would be returned.
# i.e., [since_token.current_limit..new_limit] is the batch of rooms
# we've returned (or the reverse if we paginated backwards)
# We tried to pull out limit + 1 rooms above, so if we have <= limit
# then we know there are no more results to return
new_limit = None
if chunk and (not limit or len(chunk) > limit):
if not since_token or since_token.direction_is_forward:
if limit:
chunk = chunk[:limit]
last_room_id = chunk[-1]["room_id"]
else:
if limit:
chunk = chunk[-limit:]
last_room_id = chunk[0]["room_id"]
new_limit = sorted_rooms.index(last_room_id)
results = {"chunk": chunk, "total_room_count_estimate": total_room_count}
if since_token:
results["new_rooms"] = bool(newly_visible)
if not since_token or since_token.direction_is_forward:
if new_limit is not None:
results["next_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=True,
).to_token()
if since_token:
results["prev_batch"] = since_token.copy_and_replace(
direction_is_forward=False,
current_limit=since_token.current_limit + 1,
).to_token()
else:
if new_limit is not None:
results["prev_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=False,
).to_token()
if since_token:
results["next_batch"] = since_token.copy_and_replace(
direction_is_forward=True,
current_limit=since_token.current_limit - 1,
).to_token()
return results
@defer.inlineCallbacks
def _append_room_entry_to_chunk(
self,
room_id,
num_joined_users,
chunk,
limit,
search_filter,
from_federation=False,
):
"""Generate the entry for a room in the public room list and append it
to the `chunk` if it matches the search filter
Args:
room_id (str): The ID of the room.
num_joined_users (int): The number of joined users in the room.
chunk (list)
limit (int|None): Maximum amount of rooms to display. Function will
return if length of chunk is greater than limit + 1.
search_filter (dict|None)
from_federation (bool): Whether this request originated from a
federating server or a client. Used for room filtering.
"""
if limit and len(chunk) > limit + 1:
# We've already got enough, so lets just drop it.
return
result = yield self.generate_room_entry(room_id, num_joined_users)
if not result:
return
if from_federation and not result.get("m.federate", True):
# This is a room that other servers cannot join. Do not show them
# this room.
return
if _matches_room_entry(result, search_filter):
chunk.append(result)
return response
@cachedInlineCallbacks(num_args=1, cache_context=True)
def generate_room_entry(
@ -580,32 +449,18 @@ class RoomListNextBatch(
namedtuple(
"RoomListNextBatch",
(
"stream_ordering", # stream_ordering of the first public room list
"public_room_stream_id", # public room stream id for first public room list
"current_limit", # The number of previous rooms returned
"last_room_id", # The room_id to get rooms after/before
"direction_is_forward", # Bool if this is a next_batch, false if prev_batch
),
)
):
KEY_DICT = {
"stream_ordering": "s",
"public_room_stream_id": "p",
"current_limit": "n",
"direction_is_forward": "d",
}
KEY_DICT = {"last_room_id": "r", "direction_is_forward": "d"}
REVERSE_KEY_DICT = {v: k for k, v in KEY_DICT.items()}
@classmethod
def from_token(cls, token):
if PY3:
# The argument raw=False is only available on new versions of
# msgpack, and only really needed on Python 3. Gate it behind
# a PY3 check to avoid causing issues on Debian-packaged versions.
decoded = msgpack.loads(decode_base64(token), raw=False)
else:
decoded = msgpack.loads(decode_base64(token))
decoded = msgpack.loads(decode_base64(token), raw=False)
return RoomListNextBatch(
**{cls.REVERSE_KEY_DICT[key]: val for key, val in decoded.items()}
)

8
synapse/rest/client/v1/room.py
View file

@ -361,6 +361,10 @@ class PublicRoomListRestServlet(TransactionRestServlet):
limit = parse_integer(request, "limit", 0)
since_token = parse_string(request, "since", None)
if limit == 0:
# zero is a special value which corresponds to no limit.
limit = None
handler = self.hs.get_room_list_handler()
if server:
data = yield handler.get_remote_public_room_list(
@ -398,6 +402,10 @@ class PublicRoomListRestServlet(TransactionRestServlet):
else:
network_tuple = ThirdPartyInstanceID.from_string(third_party_instance_id)
if limit == 0:
# zero is a special value which corresponds to no limit.
limit = None
handler = self.hs.get_room_list_handler()
if server:
data = yield handler.get_remote_public_room_list(

238
synapse/storage/room.py
View file

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -63,103 +64,176 @@ class RoomWorkerStore(SQLBaseStore):
desc="get_public_room_ids",
)
@cached(num_args=2, max_entries=100)
def get_public_room_ids_at_stream_id(self, stream_id, network_tuple):
"""Get pulbic rooms for a particular list, or across all lists.
def count_public_rooms(self, network_tuple, ignore_non_federatable):
"""Counts the number of public rooms as tracked in the room_stats_current
and room_stats_state table.
Args:
stream_id (int)
network_tuple (ThirdPartyInstanceID): The list to use (None, None)
means the main list, None means all lsits.
network_tuple (ThirdPartyInstanceID|None)
ignore_non_federatable (bool): If true filters out non-federatable rooms
"""
return self.runInteraction(
"get_public_room_ids_at_stream_id",
self.get_public_room_ids_at_stream_id_txn,
stream_id,
network_tuple=network_tuple,
)
def get_public_room_ids_at_stream_id_txn(self, txn, stream_id, network_tuple):
return {
rm
for rm, vis in self.get_published_at_stream_id_txn(
txn, stream_id, network_tuple=network_tuple
).items()
if vis
def _count_public_rooms_txn(txn):
query_args = []
if network_tuple:
if network_tuple.appservice_id:
published_sql = """
SELECT room_id from appservice_room_list
WHERE appservice_id = ? AND network_id = ?
"""
query_args.append(network_tuple.appservice_id)
query_args.append(network_tuple.network_id)
else:
published_sql = """
SELECT room_id FROM rooms WHERE is_public
"""
else:
published_sql = """
SELECT room_id FROM rooms WHERE is_public
UNION SELECT room_id from appservice_room_list
"""
sql = """
SELECT
COALESCE(COUNT(*), 0)
FROM (
%(published_sql)s
) published
INNER JOIN room_stats_state USING (room_id)
INNER JOIN room_stats_current USING (room_id)
WHERE
(
join_rules = 'public' OR history_visibility = 'world_readable'
)
AND joined_members > 0
""" % {
"published_sql": published_sql
}
txn.execute(sql, query_args)
return txn.fetchone()[0]
return self.runInteraction("count_public_rooms", _count_public_rooms_txn)
@defer.inlineCallbacks
def get_largest_public_rooms(
self,
network_tuple,
search_filter,
limit,
last_room_id,
forwards,
ignore_non_federatable=False,
):
"""Gets the largest public rooms (where largest is in terms of joined
members, as tracked in the statistics table).
Args:
network_tuple (ThirdPartyInstanceID|None):
search_filter (dict|None):
limit (int|None): Maxmimum number of rows to return, unlimited otherwise.
last_room_id (str|None): if present, a room ID which bounds the
result set, and is always *excluded* from the result set.
forwards (bool): true iff going forwards, going backwards otherwise
ignore_non_federatable (bool): If true filters out non-federatable rooms.
Returns:
Rooms in order: biggest number of joined users first.
We then arbitrarily use the room_id as a tie breaker.
"""
where_clauses = []
query_args = []
if last_room_id:
if forwards:
where_clauses.append("room_id < ?")
else:
where_clauses.append("? < room_id")
query_args += [last_room_id]
if search_filter and search_filter.get("generic_search_term", None):
search_term = "%" + search_filter["generic_search_term"] + "%"
where_clauses.append(
"""
(
name LIKE ?
OR topic LIKE ?
OR canonical_alias LIKE ?
)
"""
)
query_args += [search_term, search_term, search_term]
if network_tuple:
if network_tuple.appservice_id:
published_sql = """
SELECT room_id from appservice_room_list
WHERE appservice_id = ? AND network_id = ?
"""
query_args.append(network_tuple.appservice_id)
query_args.append(network_tuple.network_id)
else:
published_sql = """
SELECT room_id FROM rooms WHERE is_public
"""
else:
published_sql = """
SELECT room_id FROM rooms WHERE is_public
UNION SELECT room_id from appservice_room_list
"""
where_clause = ""
if where_clauses:
where_clause = " AND " + " AND ".join(where_clauses)
sql = """
SELECT
room_id, name, topic, canonical_alias, joined_members,
avatar, history_visibility, joined_members, guest_access
FROM (
%(published_sql)s
) published
INNER JOIN room_stats_state USING (room_id)
INNER JOIN room_stats_current USING (room_id)
WHERE
(
join_rules = 'public' OR history_visibility = 'world_readable'
)
AND joined_members > 0
%(where_clause)s
ORDER BY joined_members %(dir)s, room_id %(dir)s
""" % {
"published_sql": published_sql,
"where_clause": where_clause,
"dir": "DESC" if forwards else "ASC",
}
def get_published_at_stream_id_txn(self, txn, stream_id, network_tuple):
if network_tuple:
# We want to get from a particular list. No aggregation required.
if limit is not None:
query_args.append(limit)
sql = """
SELECT room_id, visibility FROM public_room_list_stream
INNER JOIN (
SELECT room_id, max(stream_id) AS stream_id
FROM public_room_list_stream
WHERE stream_id <= ? %s
GROUP BY room_id
) grouped USING (room_id, stream_id)
sql += """
LIMIT ?
"""
if network_tuple.appservice_id is not None:
txn.execute(
sql % ("AND appservice_id = ? AND network_id = ?",),
(stream_id, network_tuple.appservice_id, network_tuple.network_id),
)
else:
txn.execute(sql % ("AND appservice_id IS NULL",), (stream_id,))
return dict(txn)
else:
# We want to get from all lists, so we need to aggregate the results
def _get_largest_public_rooms_txn(txn):
txn.execute(sql, query_args)
logger.info("Executing full list")
results = self.cursor_to_dict(txn)
sql = """
SELECT room_id, visibility
FROM public_room_list_stream
INNER JOIN (
SELECT
room_id, max(stream_id) AS stream_id, appservice_id,
network_id
FROM public_room_list_stream
WHERE stream_id <= ?
GROUP BY room_id, appservice_id, network_id
) grouped USING (room_id, stream_id)
"""
txn.execute(sql, (stream_id,))
results = {}
# A room is visible if its visible on any list.
for room_id, visibility in txn:
results[room_id] = bool(visibility) or results.get(room_id, False)
if not forwards:
results.reverse()
return results
def get_public_room_changes(self, prev_stream_id, new_stream_id, network_tuple):
def get_public_room_changes_txn(txn):
then_rooms = self.get_public_room_ids_at_stream_id_txn(
txn, prev_stream_id, network_tuple
)
now_rooms_dict = self.get_published_at_stream_id_txn(
txn, new_stream_id, network_tuple
)
now_rooms_visible = set(rm for rm, vis in now_rooms_dict.items() if vis)
now_rooms_not_visible = set(
rm for rm, vis in now_rooms_dict.items() if not vis
)
newly_visible = now_rooms_visible - then_rooms
newly_unpublished = now_rooms_not_visible & then_rooms
return newly_visible, newly_unpublished
return self.runInteraction(
"get_public_room_changes", get_public_room_changes_txn
ret_val = yield self.runInteraction(
"get_largest_public_rooms", _get_largest_public_rooms_txn
)
defer.returnValue(ret_val)
@cached(max_entries=10000)
def is_room_blocked(self, room_id):

16
synapse/storage/schema/delta/56/public_room_list_idx.sql Normal file
View file

@ -0,0 +1,16 @@
/* Copyright 2019 The Matrix.org Foundation C.I.C.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CREATE INDEX public_room_list_stream_network ON public_room_list_stream (appservice_id, network_id, room_id);

39
tests/handlers/test_roomlist.py
View file

@ -1,39 +0,0 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.handlers.room_list import RoomListNextBatch
import tests.unittest
import tests.utils
class RoomListTestCase(tests.unittest.TestCase):
""" Tests RoomList's RoomListNextBatch. """
def setUp(self):
pass
def test_check_read_batch_tokens(self):
batch_token = RoomListNextBatch(
stream_ordering="abcdef",
public_room_stream_id="123",
current_limit=20,
direction_is_forward=True,
).to_token()
next_batch = RoomListNextBatch.from_token(batch_token)
self.assertEquals(next_batch.stream_ordering, "abcdef")
self.assertEquals(next_batch.public_room_stream_id, "123")
self.assertEquals(next_batch.current_limit, 20)
self.assertEquals(next_batch.direction_is_forward, True)