102 lines
2.2 KiB
Lua
102 lines
2.2 KiB
Lua
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--[[
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TechAge
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=======
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Copyright (C) 2020 Joachim Stolberg
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GPL v3
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See LICENSE.txt for more information
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Storage backend for node related data as node metadata
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]]--
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-- for lazy programmers
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local M = minetest.get_meta
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local storage = techage.storage
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-------------------------------------------------------------------
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-- Marshaling
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-------------------------------------------------------------------
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local use_marshal = minetest.settings:get_bool('techage_use_marshal', false)
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local MAR_MAGIC = 0x8e
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-- default functions
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local serialize = minetest.serialize
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local deserialize = minetest.deserialize
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if use_marshal then
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if not techage.IE then
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error("Please add 'secure.trusted_mods = techage' to minetest.conf!")
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end
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local marshal = techage.IE.require("marshal")
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if not marshal then
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error("Please install marshal via 'luarocks install lua-marshal'")
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end
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serialize = marshal.encode
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deserialize = function(s)
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if s ~= "" then
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if s:byte(1) == MAR_MAGIC then
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return marshal.decode(s)
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else
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return minetest.deserialize(s)
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end
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end
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end
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end
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-------------------------------------------------------------------
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-- API functions
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-------------------------------------------------------------------
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local api = {}
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function api.get_mapblock_data(key)
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return {}
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end
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function api.store_mapblock_data(key, mapblock_data)
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for key, item in pairs(mapblock_data) do
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if key ~= "in_use" then
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local pos = item and item._POS_
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if pos then
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item._POS_ = nil
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local data = serialize(item)
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local meta = M(pos)
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meta:set_string("ta_data", data)
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meta:mark_as_private("ta_data")
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end
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end
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end
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end
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function api.get_node_data(pos)
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local tbl = {}
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local s = M(pos):get_string("ta_data")
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if s ~= "" then
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tbl = deserialize(s) or {}
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end
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tbl._POS_ = table.copy(pos)
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return tbl
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end
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-- Meta data can't be written reliable at shutdown,
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-- so we have to store/restore the data differently
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function api.freeze_at_shutdown(data)
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storage:set_string("shutdown_nodedata", serialize(data))
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end
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function api.restore_at_startup()
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local s = storage:get_string("shutdown_nodedata")
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if s ~= "" then
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return deserialize(s) or {}
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end
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return {}
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end
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return api
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