476 lines
18 KiB
Python
476 lines
18 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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from twisted.internet import defer
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from ._base import BaseHandler
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from synapse.api.constants import (
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EventTypes, JoinRules,
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)
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from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
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from synapse.util.async import concurrently_execute
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from synapse.util.caches.descriptors import cachedInlineCallbacks
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from synapse.util.caches.response_cache import ResponseCache
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from synapse.types import ThirdPartyInstanceID
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from collections import namedtuple
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from unpaddedbase64 import encode_base64, decode_base64
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import logging
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import msgpack
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logger = logging.getLogger(__name__)
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REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
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# This is used to indicate we should only return rooms published to the main list.
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EMTPY_THIRD_PARTY_ID = ThirdPartyInstanceID(None, None)
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class RoomListHandler(BaseHandler):
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def __init__(self, hs):
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super(RoomListHandler, self).__init__(hs)
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self.response_cache = ResponseCache(hs)
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self.remote_response_cache = ResponseCache(hs, timeout_ms=30 * 1000)
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def get_local_public_room_list(self, limit=None, since_token=None,
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search_filter=None,
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network_tuple=EMTPY_THIRD_PARTY_ID,):
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"""Generate a local public room list.
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There are multiple different lists: the main one plus one per third
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party network. A client can ask for a specific list or to return all.
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Args:
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limit (int)
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since_token (str)
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search_filter (dict)
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network_tuple (ThirdPartyInstanceID): Which public list to use.
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This can be (None, None) to indicate the main list, or a particular
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appservice and network id to use an appservice specific one.
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Setting to None returns all public rooms across all lists.
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"""
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logger.info(
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"Getting public room list: limit=%r, since=%r, search=%r, network=%r",
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limit, since_token, bool(search_filter), network_tuple,
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)
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if search_filter:
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# We explicitly don't bother caching searches or requests for
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# appservice specific lists.
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logger.info("Bypassing cache as search request.")
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return self._get_public_room_list(
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limit, since_token, search_filter, network_tuple=network_tuple,
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)
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key = (limit, since_token, network_tuple)
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result = self.response_cache.get(key)
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if not result:
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logger.info("No cached result, calculating one.")
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result = self.response_cache.set(
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key,
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preserve_fn(self._get_public_room_list)(
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limit, since_token, network_tuple=network_tuple
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)
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)
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else:
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logger.info("Using cached deferred result.")
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return make_deferred_yieldable(result)
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@defer.inlineCallbacks
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def _get_public_room_list(self, limit=None, since_token=None,
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search_filter=None,
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network_tuple=EMTPY_THIRD_PARTY_ID,):
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if since_token and since_token != "END":
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since_token = RoomListNextBatch.from_token(since_token)
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else:
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since_token = None
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rooms_to_order_value = {}
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rooms_to_num_joined = {}
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newly_visible = []
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newly_unpublished = []
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if since_token:
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stream_token = since_token.stream_ordering
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current_public_id = yield self.store.get_current_public_room_stream_id()
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public_room_stream_id = since_token.public_room_stream_id
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newly_visible, newly_unpublished = yield self.store.get_public_room_changes(
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public_room_stream_id, current_public_id,
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network_tuple=network_tuple,
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)
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else:
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stream_token = yield self.store.get_room_max_stream_ordering()
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public_room_stream_id = yield self.store.get_current_public_room_stream_id()
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room_ids = yield self.store.get_public_room_ids_at_stream_id(
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public_room_stream_id, network_tuple=network_tuple,
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)
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# We want to return rooms in a particular order: the number of joined
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# users. We then arbitrarily use the room_id as a tie breaker.
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@defer.inlineCallbacks
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def get_order_for_room(room_id):
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# Most of the rooms won't have changed between the since token and
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# now (especially if the since token is "now"). So, we can ask what
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# the current users are in a room (that will hit a cache) and then
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# check if the room has changed since the since token. (We have to
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# do it in that order to avoid races).
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# If things have changed then fall back to getting the current state
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# at the since token.
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joined_users = yield self.store.get_users_in_room(room_id)
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if self.store.has_room_changed_since(room_id, stream_token):
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latest_event_ids = yield self.store.get_forward_extremeties_for_room(
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room_id, stream_token
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)
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if not latest_event_ids:
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return
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joined_users = yield self.state_handler.get_current_user_in_room(
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room_id, latest_event_ids,
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)
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num_joined_users = len(joined_users)
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rooms_to_num_joined[room_id] = num_joined_users
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if num_joined_users == 0:
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return
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# We want larger rooms to be first, hence negating num_joined_users
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rooms_to_order_value[room_id] = (-num_joined_users, room_id)
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yield concurrently_execute(get_order_for_room, room_ids, 10)
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sorted_entries = sorted(rooms_to_order_value.items(), key=lambda e: e[1])
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sorted_rooms = [room_id for room_id, _ in sorted_entries]
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# `sorted_rooms` should now be a list of all public room ids that is
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# stable across pagination. Therefore, we can use indices into this
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# list as our pagination tokens.
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# Filter out rooms that we don't want to return
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rooms_to_scan = [
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r for r in sorted_rooms
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if r not in newly_unpublished and rooms_to_num_joined[room_id] > 0
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]
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total_room_count = len(rooms_to_scan)
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if since_token:
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# Filter out rooms we've already returned previously
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# `since_token.current_limit` is the index of the last room we
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# sent down, so we exclude it and everything before/after it.
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if since_token.direction_is_forward:
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rooms_to_scan = rooms_to_scan[since_token.current_limit + 1:]
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else:
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rooms_to_scan = rooms_to_scan[:since_token.current_limit]
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rooms_to_scan.reverse()
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# Actually generate the entries. _append_room_entry_to_chunk will append to
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# chunk but will stop if len(chunk) > limit
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chunk = []
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if limit and not search_filter:
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step = limit + 1
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for i in xrange(0, len(rooms_to_scan), step):
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# We iterate here because the vast majority of cases we'll stop
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# at first iteration, but occaisonally _append_room_entry_to_chunk
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# won't append to the chunk and so we need to loop again.
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# We don't want to scan over the entire range either as that
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# would potentially waste a lot of work.
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yield concurrently_execute(
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lambda r: self._append_room_entry_to_chunk(
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r, rooms_to_num_joined[r],
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chunk, limit, search_filter
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),
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rooms_to_scan[i:i + step], 10
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)
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if len(chunk) >= limit + 1:
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break
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else:
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yield concurrently_execute(
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lambda r: self._append_room_entry_to_chunk(
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r, rooms_to_num_joined[r],
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chunk, limit, search_filter
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),
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rooms_to_scan, 5
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)
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chunk.sort(key=lambda e: (-e["num_joined_members"], e["room_id"]))
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# Work out the new limit of the batch for pagination, or None if we
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# know there are no more results that would be returned.
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# i.e., [since_token.current_limit..new_limit] is the batch of rooms
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# we've returned (or the reverse if we paginated backwards)
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# We tried to pull out limit + 1 rooms above, so if we have <= limit
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# then we know there are no more results to return
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new_limit = None
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if chunk and (not limit or len(chunk) > limit):
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if not since_token or since_token.direction_is_forward:
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if limit:
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chunk = chunk[:limit]
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last_room_id = chunk[-1]["room_id"]
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else:
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if limit:
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chunk = chunk[-limit:]
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last_room_id = chunk[0]["room_id"]
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new_limit = sorted_rooms.index(last_room_id)
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results = {
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"chunk": chunk,
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"total_room_count_estimate": total_room_count,
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}
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if since_token:
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results["new_rooms"] = bool(newly_visible)
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if not since_token or since_token.direction_is_forward:
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if new_limit is not None:
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results["next_batch"] = RoomListNextBatch(
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stream_ordering=stream_token,
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public_room_stream_id=public_room_stream_id,
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current_limit=new_limit,
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direction_is_forward=True,
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).to_token()
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if since_token:
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results["prev_batch"] = since_token.copy_and_replace(
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direction_is_forward=False,
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current_limit=since_token.current_limit + 1,
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).to_token()
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else:
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if new_limit is not None:
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results["prev_batch"] = RoomListNextBatch(
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stream_ordering=stream_token,
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public_room_stream_id=public_room_stream_id,
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current_limit=new_limit,
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direction_is_forward=False,
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).to_token()
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if since_token:
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results["next_batch"] = since_token.copy_and_replace(
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direction_is_forward=True,
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current_limit=since_token.current_limit - 1,
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).to_token()
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defer.returnValue(results)
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@defer.inlineCallbacks
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def _append_room_entry_to_chunk(self, room_id, num_joined_users, chunk, limit,
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search_filter):
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"""Generate the entry for a room in the public room list and append it
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to the `chunk` if it matches the search filter
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"""
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if limit and len(chunk) > limit + 1:
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# We've already got enough, so lets just drop it.
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return
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result = yield self.generate_room_entry(room_id, num_joined_users)
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if result and _matches_room_entry(result, search_filter):
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chunk.append(result)
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@cachedInlineCallbacks(num_args=1, cache_context=True)
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def generate_room_entry(self, room_id, num_joined_users, cache_context,
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with_alias=True, allow_private=False):
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"""Returns the entry for a room
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"""
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result = {
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"room_id": room_id,
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"num_joined_members": num_joined_users,
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}
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current_state_ids = yield self.store.get_current_state_ids(
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room_id, on_invalidate=cache_context.invalidate,
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)
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event_map = yield self.store.get_events([
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event_id for key, event_id in current_state_ids.iteritems()
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if key[0] in (
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EventTypes.JoinRules,
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EventTypes.Name,
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EventTypes.Topic,
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EventTypes.CanonicalAlias,
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EventTypes.RoomHistoryVisibility,
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EventTypes.GuestAccess,
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"m.room.avatar",
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)
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])
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current_state = {
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(ev.type, ev.state_key): ev
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for ev in event_map.values()
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}
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# Double check that this is actually a public room.
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join_rules_event = current_state.get((EventTypes.JoinRules, ""))
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if join_rules_event:
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join_rule = join_rules_event.content.get("join_rule", None)
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if not allow_private and join_rule and join_rule != JoinRules.PUBLIC:
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defer.returnValue(None)
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if with_alias:
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aliases = yield self.store.get_aliases_for_room(
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room_id, on_invalidate=cache_context.invalidate
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)
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if aliases:
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result["aliases"] = aliases
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name_event = yield current_state.get((EventTypes.Name, ""))
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if name_event:
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name = name_event.content.get("name", None)
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if name:
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result["name"] = name
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topic_event = current_state.get((EventTypes.Topic, ""))
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if topic_event:
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topic = topic_event.content.get("topic", None)
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if topic:
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result["topic"] = topic
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canonical_event = current_state.get((EventTypes.CanonicalAlias, ""))
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if canonical_event:
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canonical_alias = canonical_event.content.get("alias", None)
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if canonical_alias:
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result["canonical_alias"] = canonical_alias
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visibility_event = current_state.get((EventTypes.RoomHistoryVisibility, ""))
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visibility = None
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if visibility_event:
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visibility = visibility_event.content.get("history_visibility", None)
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result["world_readable"] = visibility == "world_readable"
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guest_event = current_state.get((EventTypes.GuestAccess, ""))
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guest = None
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if guest_event:
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guest = guest_event.content.get("guest_access", None)
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result["guest_can_join"] = guest == "can_join"
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avatar_event = current_state.get(("m.room.avatar", ""))
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if avatar_event:
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avatar_url = avatar_event.content.get("url", None)
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if avatar_url:
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result["avatar_url"] = avatar_url
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defer.returnValue(result)
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@defer.inlineCallbacks
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def get_remote_public_room_list(self, server_name, limit=None, since_token=None,
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search_filter=None, include_all_networks=False,
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third_party_instance_id=None,):
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if search_filter:
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# We currently don't support searching across federation, so we have
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# to do it manually without pagination
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limit = None
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since_token = None
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res = yield self._get_remote_list_cached(
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server_name, limit=limit, since_token=since_token,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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if search_filter:
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res = {"chunk": [
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entry
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for entry in list(res.get("chunk", []))
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if _matches_room_entry(entry, search_filter)
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]}
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defer.returnValue(res)
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def _get_remote_list_cached(self, server_name, limit=None, since_token=None,
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search_filter=None, include_all_networks=False,
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third_party_instance_id=None,):
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repl_layer = self.hs.get_replication_layer()
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if search_filter:
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# We can't cache when asking for search
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return repl_layer.get_public_rooms(
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server_name, limit=limit, since_token=since_token,
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search_filter=search_filter, include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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key = (
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server_name, limit, since_token, include_all_networks,
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third_party_instance_id,
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)
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result = self.remote_response_cache.get(key)
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if not result:
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result = self.remote_response_cache.set(
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key,
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repl_layer.get_public_rooms(
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server_name, limit=limit, since_token=since_token,
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search_filter=search_filter,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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)
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return result
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class RoomListNextBatch(namedtuple("RoomListNextBatch", (
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"stream_ordering", # stream_ordering of the first public room list
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"public_room_stream_id", # public room stream id for first public room list
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"current_limit", # The number of previous rooms returned
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"direction_is_forward", # Bool if this is a next_batch, false if prev_batch
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))):
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KEY_DICT = {
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"stream_ordering": "s",
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"public_room_stream_id": "p",
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"current_limit": "n",
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"direction_is_forward": "d",
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}
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REVERSE_KEY_DICT = {v: k for k, v in KEY_DICT.items()}
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@classmethod
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def from_token(cls, token):
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return RoomListNextBatch(**{
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cls.REVERSE_KEY_DICT[key]: val
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for key, val in msgpack.loads(decode_base64(token)).items()
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})
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def to_token(self):
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return encode_base64(msgpack.dumps({
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self.KEY_DICT[key]: val
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for key, val in self._asdict().items()
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}))
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def copy_and_replace(self, **kwds):
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return self._replace(
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**kwds
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)
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def _matches_room_entry(room_entry, search_filter):
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if search_filter and search_filter.get("generic_search_term", None):
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generic_search_term = search_filter["generic_search_term"].upper()
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if generic_search_term in room_entry.get("name", "").upper():
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return True
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elif generic_search_term in room_entry.get("topic", "").upper():
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return True
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elif generic_search_term in room_entry.get("canonical_alias", "").upper():
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return True
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else:
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return True
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return False
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