synapse/synapse/federation/federation_server.py

Lines 1495 to 1528 in 70b3396

    
           def _get_event_ids_for_partial_state_join( 
        
               join_event: EventBase, 
        
               prev_state_ids: StateMap[str], 
        
           ) -> Collection[str]: 
        
               """Calculate state to be retuned in a partial_state send_join 
        
               Args: 
        
                   join_event: the join event being send_joined 
        
                   prev_state_ids: the event ids of the state before the join 
        
               Returns: 
        
                   the event ids to be returned 
        
               """ 
        
               # return all non-member events 
        
               state_event_ids = { 
        
                   event_id 
        
                   for (event_type, state_key), event_id in prev_state_ids.items() 
        
                   if event_type != EventTypes.Member 
        
               } 
        
               # we also need the current state of the current user (it's going to 
        
               # be an auth event for the new join, so we may as well return it) 
        
               current_membership_event_id = prev_state_ids.get( 
        
                   (EventTypes.Member, join_event.state_key) 
        
               ) 
        
               if current_membership_event_id is not None: 
        
                   state_event_ids.add(current_membership_event_id) 
        
               # TODO: return a few more members: 
        
               #   - those with invites 
        
               #   - those that are kicked? / banned 
        
               return state_event_ids

seems like it's a good place to start.

	def _get_event_ids_for_partial_state_join(
	join_event: EventBase,
	prev_state_ids: StateMap[str],
	) -> Collection[str]:
	"""Calculate state to be retuned in a partial_state send_join

	Args:
	join_event: the join event being send_joined
	prev_state_ids: the event ids of the state before the join

	Returns:
	the event ids to be returned
	"""

	# return all non-member events
	state_event_ids = {
	event_id
	for (event_type, state_key), event_id in prev_state_ids.items()
	if event_type != EventTypes.Member
	}

	# we also need the current state of the current user (it's going to
	# be an auth event for the new join, so we may as well return it)
	current_membership_event_id = prev_state_ids.get(
	(EventTypes.Member, join_event.state_key)
	)
	if current_membership_event_id is not None:
	state_event_ids.add(current_membership_event_id)

	# TODO: return a few more members:
	# - those with invites
	# - those that are kicked? / banned

	return state_event_ids

Uh oh!

Faster joins: send heroes to handle nameless rooms #12995

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Faster joins: send `heroes` to handle nameless rooms #12995