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Make sure item_exit() exists before calling it inside minetest.after()

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When a signal/detector tube breaks, its minetest.after() can be triggered
just after that, perhaps several times, causing it to try to execute the
item_exit() callback of whatever node is present at least once, but a
broken tube has just taken its place and has no such callback.
This commit is contained in:
Vanessa Dannenberg 2021-03-30 08:15:23 -04:00
parent 7ad991ce40
commit a6e4f2dceb
1 changed files with 14 additions and 2 deletions
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16
signal_tubes.lua
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@ -1,4 +1,16 @@
local S = minetest.get_translator("pipeworks")
-- the minetest.after() calls below can sometimes trigger after a tube
-- breaks, at which point item_exit() is no longer valid, so we have to make
-- sure that there even IS a callback to run, first.
local function after_break(pos)
local name = minetest.get_node(pos).name
if minetest.registered_nodes[name].item_exit then
minetest.registered_nodes[name].item_exit(pos)
end
end
if pipeworks.enable_detector_tube then
local detector_tube_step = 5 * tonumber(minetest.settings:get("dedicated_server_step"))
pipeworks.register_tube("pipeworks:detector_tube_on", {
@ -12,7 +24,7 @@ if pipeworks.enable_detector_tube then
local nitems = meta:get_int("nitems")+1
meta:set_int("nitems", nitems)
local saved_pos = vector.new(pos)
minetest.after(detector_tube_step, minetest.registered_nodes[name].item_exit, saved_pos)
minetest.after(detector_tube_step, after_break, saved_pos)
return pipeworks.notvel(pipeworks.meseadjlist,velocity)
end},
groups = {mesecon = 2, not_in_creative_inventory = 1},
@ -36,7 +48,7 @@ if pipeworks.enable_detector_tube then
meta:set_int("nitems", 1)
local name = minetest.get_node(pos).name
local saved_pos = vector.new(pos)
minetest.after(detector_tube_step, minetest.registered_nodes[name].item_exit, saved_pos)
minetest.after(detector_tube_step, after_break, pos)
end,
},
})