Pull out the 'get_rooms_for_user' cache logic into a reüsable @cached decorator

This commit is contained in:
Paul "LeoNerd" Evans 2015-02-19 14:58:07 +00:00
parent 63c1f4fa98
commit 61959928bb

View File

@ -33,6 +33,32 @@ RoomsForUser = namedtuple(
)
# TODO(paul):
# * Move this somewhere higher-level, shared;
# * more generic key management
# * export monitoring stats
# * maximum size; just evict things at random, or consider LRU?
def cached(orig):
cache = {}
@defer.inlineCallbacks
def wrapped(self, key):
if key in cache:
defer.returnValue(cache[key])
ret = yield orig(self, key)
cache[key] = ret;
defer.returnValue(ret)
def invalidate(key):
if key in cache:
del cache[key]
wrapped.invalidate = invalidate
return wrapped
class RoomMemberStore(SQLBaseStore):
def __init__(self, *args, **kw):
@ -103,7 +129,7 @@ class RoomMemberStore(SQLBaseStore):
txn.execute(sql, (event.room_id, domain))
self.invalidate_rooms_for_user(target_user_id)
self.get_rooms_for_user.invalidate(target_user_id)
@defer.inlineCallbacks
def get_room_member(self, user_id, room_id):
@ -247,33 +273,12 @@ class RoomMemberStore(SQLBaseStore):
results = self._parse_events_txn(txn, rows)
return results
# TODO(paul): Create a nice @cached decorator to do this
# @cached
# def get_foo(...)
# ...
# invalidate_foo = get_foo.invalidator
@defer.inlineCallbacks
@cached
def get_rooms_for_user(self, user_id):
# TODO(paul): put some performance counters in here so we can easily
# track what impact this cache is having
if user_id in self._user_rooms_cache:
defer.returnValue(self._user_rooms_cache[user_id])
rooms = yield self.get_rooms_for_user_where_membership_is(
return self.get_rooms_for_user_where_membership_is(
user_id, membership_list=[Membership.JOIN],
)
# TODO(paul): Consider applying a maximum size; just evict things at
# random, or consider LRU?
self._user_rooms_cache[user_id] = rooms
defer.returnValue(rooms)
def invalidate_rooms_for_user(self, user_id):
if user_id in self._user_rooms_cache:
del self._user_rooms_cache[user_id]
@defer.inlineCallbacks
def user_rooms_intersect(self, user_id_list):
""" Checks whether all the users whose IDs are given in a list share a