# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from ._base import BaseHandler
from synapse.api.constants import (
EventTypes, JoinRules,
)
from synapse.api.errors import SynapseError
from synapse.util.async import concurrently_execute
from synapse.util.caches.response_cache import ResponseCache
from collections import namedtuple
from unpaddedbase64 import encode_base64, decode_base64
import logging
import msgpack
logger = logging.getLogger(__name__)
REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
class RoomListHandler(BaseHandler):
def __init__(self, hs):
super(RoomListHandler, self).__init__(hs)
self.response_cache = ResponseCache(hs)
def get_local_public_room_list(self, limit=None, next_batch=None):
result = self.response_cache.get((limit, next_batch))
if not result:
result = self.response_cache.set(
(limit, next_batch),
self._get_public_room_list(limit, next_batch)
)
return result
@defer.inlineCallbacks
def _get_public_room_list(self, limit=None, next_batch=None):
if next_batch and next_batch != "END":
next_batch = RoomListNextBatch.from_token(next_batch)
else:
next_batch = None
room_ids = yield self.store.get_public_room_ids()
rooms_to_order_value = {}
rooms_to_num_joined = {}
rooms_to_latest_event_ids = {}
if next_batch:
current_stream_token = next_batch.sstream_ordering
else:
current_stream_token = yield self.store.get_room_max_stream_ordering()
# 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.
@defer.inlineCallbacks
def get_order_for_room(room_id):
latest_event_ids = rooms_to_latest_event_ids.get(room_id, None)
if not latest_event_ids:
latest_event_ids = yield self.store.get_forward_extremeties_for_room(
room_id, current_stream_token
)
rooms_to_latest_event_ids[room_id] = latest_event_ids
if not latest_event_ids:
return
joined_users = yield self.state_handler.get_current_user_in_room(
room_id, latest_event_ids,
)
num_joined_users = len(joined_users)
rooms_to_num_joined[room_id] = num_joined_users
if num_joined_users == 0:
return
# We want larger rooms to be first, hence negating num_joined_users
rooms_to_order_value[room_id] = (-num_joined_users, room_id)
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]
if next_batch:
sorted_rooms = sorted_rooms[next_batch.current_limit:]
new_limit = None
if limit:
if sorted_rooms[limit:]:
new_limit = limit
if next_batch:
new_limit += next_batch.current_limit
sorted_rooms = sorted_rooms[:limit]
results = []
@defer.inlineCallbacks
def handle_room(room_id):
num_joined_users = rooms_to_num_joined[room_id]
if num_joined_users == 0:
return
result = {
"room_id": room_id,
"num_joined_members": num_joined_users,
}
current_state_ids = yield self.state_handler.get_current_state_ids(room_id)
event_map = yield self.store.get_events([
event_id for key, event_id in current_state_ids.items()
if key[0] in (
EventTypes.JoinRules,
EventTypes.Name,
EventTypes.Topic,
EventTypes.CanonicalAlias,
EventTypes.RoomHistoryVisibility,
EventTypes.GuestAccess,
"m.room.avatar",
)
])
current_state = {
(ev.type, ev.state_key): ev
for ev in event_map.values()
}
# Double check that this is actually a public room.
join_rules_event = current_state.get((EventTypes.JoinRules, ""))
if join_rules_event:
join_rule = join_rules_event.content.get("join_rule", None)
if join_rule and join_rule != JoinRules.PUBLIC:
defer.returnValue(None)
aliases = yield self.store.get_aliases_for_room(room_id)
if aliases:
result["aliases"] = aliases
name_event = yield current_state.get((EventTypes.Name, ""))
if name_event:
name = name_event.content.get("name", None)
if name:
result["name"] = name
topic_event = current_state.get((EventTypes.Topic, ""))
if topic_event:
topic = topic_event.content.get("topic", None)
if topic:
result["topic"] = topic
canonical_event = current_state.get((EventTypes.CanonicalAlias, ""))
if canonical_event:
canonical_alias = canonical_event.content.get("alias", None)
if canonical_alias:
result["canonical_alias"] = canonical_alias
visibility_event = current_state.get((EventTypes.RoomHistoryVisibility, ""))
visibility = None
if visibility_event:
visibility = visibility_event.content.get("history_visibility", None)
result["world_readable"] = visibility == "world_readable"
guest_event = current_state.get((EventTypes.GuestAccess, ""))
guest = None
if guest_event:
guest = guest_event.content.get("guest_access", None)
result["guest_can_join"] = guest == "can_join"
avatar_event = current_state.get(("m.room.avatar", ""))
if avatar_event:
avatar_url = avatar_event.content.get("url", None)
if avatar_url:
result["avatar_url"] = avatar_url
results.append(result)
yield concurrently_execute(handle_room, sorted_rooms, 10)
if new_limit:
end_token = RoomListNextBatch(
stream_ordering=current_stream_token,
current_limit=new_limit,
).to_token()
else:
end_token = "END"
if next_batch:
start_token = next_batch.to_token()
else:
start_token = "START"
defer.returnValue({
"start": start_token,
"end": end_token,
"chunk": results,
})
@defer.inlineCallbacks
def get_remote_public_room_list(self, server_name):
res = yield self.hs.get_replication_layer().get_public_rooms(
[server_name]
)
if server_name not in res:
raise SynapseError(404, "Server not found")
defer.returnValue(res[server_name])
class RoomListNextBatch(namedtuple("RoomListNextBatch", (
"stream_ordering", # stream_ordering of the first public room list
"current_limit", # The number of previous rooms returned
))):
KEY_DICT = {
"stream_ordering": "s",
"current_limit": "n",
}
REVERSE_KEY_DICT = {v: k for k, v in KEY_DICT.items()}
@classmethod
def from_token(cls, token):
return RoomListNextBatch(**{
cls.REVERSE_KEY_DICT[key]: val
for key, val in msgpack.loads(decode_base64(token)).items()
})
def to_token(self):
return encode_base64(msgpack.dumps({
self.KEY_DICT[key]: val
for key, val in self._asdict().items()
}))