## 1.51. enablenode_int( integer )

Function Properties
Language: PLPGSQL
Return Type: integer

no_id - Node ID # Internal function to process the ENABLE_NODE event for node no_id

    declare
    	p_no_id			alias for $1;
    	v_local_node_id	int4;
    	v_node_row		record;
    	v_sub_row		record;
    begin
    	-- ----
    	-- Grab the central configuration lock
    	-- ----
    	lock table sl_config_lock;

    	-- ----
    	-- Check that the node is inactive
    	-- ----
    	select * into v_node_row
    			from sl_node
    			where no_id = p_no_id
    			for update;
    	if not found then
    		raise exception 'Slony-I: node % not found', p_no_id;
    	end if;
    	if v_node_row.no_active then
    		return p_no_id;
    	end if;

    	-- ----
    	-- Activate the node and generate sl_confirm status rows for it.
    	-- ----
    	update sl_node
    			set no_active = 't'
    			where no_id = p_no_id;
    	insert into sl_confirm
    			(con_origin, con_received, con_seqno)
    			select no_id, p_no_id, 0 from sl_node
    				where no_id != p_no_id
    				and no_active;
    	insert into sl_confirm
    			(con_origin, con_received, con_seqno)
    			select p_no_id, no_id, 0 from sl_node
    				where no_id != p_no_id
    				and no_active;

    	-- ----
    	-- Generate ENABLE_SUBSCRIPTION events for all sets that
    	-- origin here and are subscribed by the just enabled node.
    	-- ----
    	v_local_node_id := getLocalNodeId('_schemadoc');
    	for v_sub_row in select SUB.sub_set, SUB.sub_provider from
    			sl_set S,
    			sl_subscribe SUB
    			where S.set_origin = v_local_node_id
    			and S.set_id = SUB.sub_set
    			and SUB.sub_receiver = p_no_id
    			for update of S
    	loop
    		perform enableSubscription (v_sub_row.sub_set,
    				v_sub_row.sub_provider, p_no_id);
    	end loop;

    	return p_no_id;
    end;