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Resolve itemframe entity duplication Fixes #405. 

The ABM that replaces deleted entities in itemframes and pedestals can sometimes add multiple copies of each entity due to a race condition in which the ABM runs either before the server loads the entities or after they have been removed due to the map block being unloaded.  Due to limitations in determining when all entities have been loaded, this race condition cannot be fully avoided.  This commit converts the ABM, which ran every fifteen seconds, into and LBM that runs on every load and adds a check to the entities when they are loaded such that only the first loaded entity will be kept and any additional copies delete themselves during the loading process.
This commit is contained in:
Foz 2018-03-12 03:50:14 -04:00 committed by Vanessa Dannenberg
parent eb2b3d7980
commit 39984c356b
1 changed files with 43 additions and 17 deletions
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60
itemframes/init.lua
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@ -32,6 +32,25 @@ minetest.register_entity("itemframes:item",{
if self.nodename == "itemframes:pedestal" then
self.object:set_properties({automatic_rotate = 1})
end
if self.texture ~= nil and self.nodename ~= nil then
local entity_pos = vector.round(self.object:get_pos())
local objs = minetest.get_objects_inside_radius(entity_pos, 0.5)
for _, obj in ipairs(objs) do
if obj ~= self.object and
obj:get_luaentity() and
obj:get_luaentity().name == "itemframes:item" and
obj:get_luaentity().nodename == self.nodename and
obj:get_properties() and
obj:get_properties().textures and
obj:get_properties().textures[1] == self.texture then
minetest.log("action","[itemframes] Removing extra " ..
self.texture .. " found in " .. self.nodename .. " at " ..
minetest.pos_to_string(entity_pos))
self.object:remove()
break
end
end
end
end,
get_staticdata = function(self)
if self.nodename ~= nil and self.texture ~= nil then
@ -228,24 +247,31 @@ minetest.register_node("itemframes:pedestal",{
-- automatically restore entities lost from frames/pedestals
-- due to /clearobjects or similar
minetest.register_abm({
minetest.register_lbm({
label = "Maintain itemframe and pedestal entities",
name = "itemframes:maintain_entities",
nodenames = {"itemframes:frame", "itemframes:pedestal"},
interval = 15,
chance = 1,
action = function(pos, node, active_object_count, active_object_count_wider)
local num
if node.name == "itemframes:frame" then
num = #minetest.get_objects_inside_radius(pos, 0.5)
elseif node.name == "itemframes:pedestal" then
pos.y = pos.y + 1
num = #minetest.get_objects_inside_radius(pos, 0.5)
pos.y = pos.y - 1
end
if num > 0 then return end
update_item(pos, node)
run_at_every_load = true,
action = function(pos, node)
minetest.after(0,
function(pos, node)
local meta = minetest.get_meta(pos)
local itemstring = meta:get_string("item")
if itemstring ~= "" then
local entity_pos = pos
if node.name == "itemframes:pedestal" then
entity_pos = {x=pos.x,y=pos.y+1,z=pos.z}
end
local objs = minetest.get_objects_inside_radius(entity_pos, 0.5)
if #objs == 0 then
minetest.log("action","[itemframes] Replacing missing " ..
itemstring .. " in " .. node.name .. " at " ..
minetest.pos_to_string(pos))
update_item(pos, node)
end
end
end,
pos, node)
end
})