mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 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 synapse.util.caches import cache_counter, caches_by_name
|
|
|
|
|
|
from blist import sorteddict
|
|
import logging
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class RoomStreamChangeCache(object):
|
|
"""Keeps track of the stream_id of the latest change in rooms.
|
|
|
|
Given a list of rooms and stream key, it will give a subset of rooms that
|
|
may have changed since that key. If the key is too old then the cache
|
|
will simply return all rooms.
|
|
"""
|
|
def __init__(self, name, current_key, size_of_cache=10000):
|
|
self._size_of_cache = size_of_cache
|
|
self._room_to_key = {}
|
|
self._cache = sorteddict()
|
|
self._earliest_known_key = current_key
|
|
self.name = name
|
|
caches_by_name[self.name] = self._cache
|
|
|
|
def get_room_has_changed(self, room_id, key):
|
|
if key <= self._earliest_known_key:
|
|
return True
|
|
|
|
room_key = self._room_to_key.get(room_id, None)
|
|
if room_key is None:
|
|
return True
|
|
|
|
if key < room_key:
|
|
return True
|
|
|
|
return False
|
|
|
|
def get_rooms_changed(self, store, room_ids, key):
|
|
"""Returns subset of room ids that have had new things since the
|
|
given key. If the key is too old it will just return the given list.
|
|
"""
|
|
if key > self._earliest_known_key:
|
|
keys = self._cache.keys()
|
|
i = keys.bisect_right(key)
|
|
|
|
result = set(
|
|
self._cache[k] for k in keys[i:]
|
|
).intersection(room_ids)
|
|
|
|
cache_counter.inc_hits(self.name)
|
|
else:
|
|
result = room_ids
|
|
cache_counter.inc_misses(self.name)
|
|
|
|
return result
|
|
|
|
def room_has_changed(self, store, room_id, key):
|
|
"""Informs the cache that the room has been changed at the given key.
|
|
"""
|
|
if key > self._earliest_known_key:
|
|
old_key = self._room_to_key.get(room_id, None)
|
|
if old_key:
|
|
key = max(key, old_key)
|
|
self._cache.pop(old_key, None)
|
|
self._cache[key] = room_id
|
|
|
|
while len(self._cache) > self._size_of_cache:
|
|
k, r = self._cache.popitem()
|
|
self._earliest_key = max(k, self._earliest_key)
|
|
self._room_to_key.pop(r, None)
|