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Avoid creating events with huge numbers of prev_events

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In most cases, we limit the number of prev_events for a given event to 10
events. This fixes a particular code path which created events with huge
numbers of prev_events.
This commit is contained in:
Richard van der Hoff 2018-04-16 18:41:37 +01:00
parent 512633ef44
commit 639480e14a
4 changed files with 162 additions and 54 deletions
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13
synapse/handlers/room_member.py
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@ -149,7 +149,7 @@ class RoomMemberHandler(object):
@defer.inlineCallbacks
def _local_membership_update(
self, requester, target, room_id, membership,
prev_event_ids,
prev_events_and_hashes,
txn_id=None,
ratelimit=True,
content=None,
@ -175,7 +175,7 @@ class RoomMemberHandler(object):
},
token_id=requester.access_token_id,
txn_id=txn_id,
prev_event_ids=prev_event_ids,
prev_events_and_hashes=prev_events_and_hashes,
)
# Check if this event matches the previous membership event for the user.
@ -314,7 +314,12 @@ class RoomMemberHandler(object):
403, "Invites have been disabled on this server",
)
latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
prev_events_and_hashes = yield self.store.get_prev_events_for_room(
room_id,
)
latest_event_ids = (
event_id for (event_id, _, _) in prev_events_and_hashes
)
current_state_ids = yield self.state_handler.get_current_state_ids(
room_id, latest_event_ids=latest_event_ids,
)
@ -403,7 +408,7 @@ class RoomMemberHandler(object):
membership=effective_membership_state,
txn_id=txn_id,
ratelimit=ratelimit,
prev_event_ids=latest_event_ids,
prev_events_and_hashes=prev_events_and_hashes,
content=content,
)
defer.returnValue(res)