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teleport_tube.lua: add checks for hash collisions in positions table
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@ -50,6 +50,11 @@ local function read_tube_db()
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return tp_tube_db
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end
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-- debug formatter for coordinates used below
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local fmt = function(pos)
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return pos.x..", "..pos.y..", "..pos.z
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end
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-- updates or adds a tube
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local function set_tube(pos, channel, can_receive)
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local tubes = tp_tube_db or read_tube_db()
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@ -63,6 +68,19 @@ local function set_tube(pos, channel, can_receive)
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end
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-- we haven't found any tp tube to update, so lets add it
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-- but sanity check that the hash has not already been inserted.
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-- if so, complain very loudly and refuse the update so the player knows something is amiss.
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-- to catch regressions of https://github.com/minetest-mods/pipeworks/issues/166
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local existing = tp_tube_db[hash]
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if existing ~= nil then
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local e = "error"
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minetest.log(e, "pipeworks teleport tube update refused due to position hash collision")
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minetest.log(e, "collided hash: "..hash)
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minetest.log(e, "tried-to-place tube: "..fmt(pos))
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minetest.log(e, "existing tube: "..fmt(existing))
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return
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end
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tp_tube_db[hash] = {x=pos.x,y=pos.y,z=pos.z,channel=channel,cr=can_receive}
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save_tube_db()
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end
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