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Refactor get_user_ids_changed to pull less from DB

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When a client asks for users whose devices have changed since a token we
used to pull *all* users from the database since the token, which could
easily be thousands of rows for old tokens.

This PR changes this to only check for changes for users the client is
actually interested in.

Fixes #5553
This commit is contained in:
Erik Johnston 2019-06-26 11:56:52 +01:00
parent 0e97284dfa
commit a2f6d31a63
3 changed files with 58 additions and 29 deletions
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12
synapse/handlers/device.py
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@ -101,9 +101,13 @@ class DeviceWorkerHandler(BaseHandler):
room_ids = yield self.store.get_rooms_for_user(user_id)
# First we check if any devices have changed
# First we check if any devices have changed for users that we share
# rooms with.
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
changed = yield self.store.get_user_whose_devices_changed(
from_token.device_list_key
from_token.device_list_key, users_who_share_room
)
# Then work out if any users have since joined
@ -188,10 +192,6 @@ class DeviceWorkerHandler(BaseHandler):
break
if possibly_changed or possibly_left:
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
# Take the intersection of the users whose devices may have changed
# and those that actually still share a room with the user
possibly_joined = possibly_changed & users_who_share_room