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Make presence.get_new_events a bit faster

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We do this by caching the set of users a user shares rooms with.
This commit is contained in:
Erik Johnston 2017-02-02 13:07:18 +00:00
parent 14d5e22700
commit 54a79c1d37
4 changed files with 33 additions and 29 deletions
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44
synapse/handlers/presence.py
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@ -1011,7 +1011,7 @@ class PresenceEventSource(object):
@defer.inlineCallbacks
@log_function
def get_new_events(self, user, from_key, room_ids=None, include_offline=True,
**kwargs):
explicit_room_id=None, **kwargs):
# The process for getting presence events are:
# 1. Get the rooms the user is in.
# 2. Get the list of user in the rooms.
@ -1028,22 +1028,24 @@ class PresenceEventSource(object):
user_id = user.to_string()
if from_key is not None:
from_key = int(from_key)
room_ids = room_ids or []
presence = self.get_presence_handler()
stream_change_cache = self.store.presence_stream_cache
if not room_ids:
rooms = yield self.store.get_rooms_for_user(user_id)
room_ids = set(e.room_id for e in rooms)
else:
room_ids = set(room_ids)
max_token = self.store.get_current_presence_token()
plist = yield self.store.get_presence_list_accepted(user.localpart)
friends = set(row["observed_user_id"] for row in plist)
friends.add(user_id) # So that we receive our own presence
users_interested_in = set(row["observed_user_id"] for row in plist)
users_interested_in.add(user_id) # So that we receive our own presence
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
users_interested_in.update(users_who_share_room)
if explicit_room_id:
user_ids = yield self.store.get_users_in_room(explicit_room_id)
users_interested_in.update(user_ids)
user_ids_changed = set()
changed = None
@ -1055,35 +1057,19 @@ class PresenceEventSource(object):
# work out if we share a room or they're in our presence list
get_updates_counter.inc("stream")
for other_user_id in changed:
if other_user_id in friends:
if other_user_id in users_interested_in:
user_ids_changed.add(other_user_id)
continue
other_rooms = yield self.store.get_rooms_for_user(other_user_id)
if room_ids.intersection(e.room_id for e in other_rooms):
user_ids_changed.add(other_user_id)
continue
else:
# Too many possible updates. Find all users we can see and check
# if any of them have changed.
get_updates_counter.inc("full")
user_ids_to_check = set()
for room_id in room_ids:
users = yield self.store.get_users_in_room(room_id)
user_ids_to_check.update(users)
user_ids_to_check.update(friends)
# Always include yourself. Only really matters for when the user is
# not in any rooms, but still.
user_ids_to_check.add(user_id)
if from_key:
user_ids_changed = stream_change_cache.get_entities_changed(
user_ids_to_check, from_key,
users_interested_in, from_key,
)
else:
user_ids_changed = user_ids_to_check
user_ids_changed = users_interested_in
updates = yield presence.current_state_for_users(user_ids_changed)